I Made Sadiana - Academia.edu (original) (raw)

Papers by I Made Sadiana

Molekul

Clay is a natural material that has been widely applied as a low-cost adsorbent for removing vari... more Clay is a natural material that has been widely applied as a low-cost adsorbent for removing various contaminants from wastewater. To improve its characteristics and activity, natural clay from Central Kalimantan was activated by acid and calcination treatments, then synthesized with magnetite (Fe3O4) in nanocomposite by co-precipitation method. The obtained nanocomposite was further characterized by Fourier transform infrared spectroscopy, X-ray diffraction, nitrogen adsorption, vibrating sample magnetometry, and transmission electron microscopy methods. The results showed that co-precipitation method has been successfully produced clay-magnetite nanocomposite from activated clay with specific surface area, saturation magnetization, and particle size were 37.458 m2/g, 24.910 emu/g, and 50 nm, respectively. The obtained natural clay, activated clay, and clay-magnetite nanocomposite were then evaluated for adsorptive removal of naphthol blue black (NBB) synthetic dye from wastewater ...

BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan, 2021

Danau Sadar Village is a village located in the sub-district of Dusun Selatan, 8 km from Buntok, ... more Danau Sadar Village is a village located in the sub-district of Dusun Selatan, 8 km from Buntok, the capital of South Barito Regency. This village has several potentials such as rubber plantation, livestock sector, tourism, and fisheries sector. Even though this potential is quite remarkable, the citizen welfare is still in low catagories due to the lack of skill in managing it. This condition happened because not all workers are engaged in the production process. Related to the condition of the community in Danau Sadar Village, an idea emerged to empower the community, by providing training to improve their skills. The objectives of community service in Danau Sadar Village are as follows: (1) assisting the people of Danau Sadar Village in developing economic independence; (2) improving entrepreneurial skills through the training provided. The community service program has been successful by carrying out two types of training activities to improve citizen welfare: training on biogas...

ABSTRAK Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan ... more ABSTRAK Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan sebagai adsorben zat warna methylene blue dalam sistem larutan. Sintesis komposit lempung alam magnetit dilakukan dengan aktivasi asam terhadap lempung alam, selanjutnya dikompositkan dengan magnetit menggunakan metode kopresipitasi dengan rasio mol Fe 2+ : Fe 3+ = 1 : 2 pada temperatur 85 ο C. Karakterisasi terhadap hasil sintesis dilakukan dengan XRD dan FTIR. Adsorpsi dilakukan menggunakan sistem batch, dengan kajian adsorpsi yang dipelajari meliputi pH optimum, kinetika adsorpsi dan kesetimbangan adsorpsi. Hasil karakterisasi menunjukkan bahwa oksida besi Fe 3 O 4 (magnetit) dapat terkompositkan dengan lempung alam. lempung alam teraktivasi dan lempung alam magnetik komposit mampu mengadsorpsi methylene blue dalam larutan dengan adsorpsi optimal terjadi pada pH 3. Adsorpsi methylene blue oleh kedua jenis adsorben mengikuti persamaan kinetika orde dua semu dengan konstanta laju adsorp...

Indonesian Journal of Chemistry, 2010

Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCl4 solution. After s... more Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCl4 solution. After separation, the sample was dried and calcinated at 550 °C for 4 hours under nitrogen stream. Furthermore, the sample was oxidized with oxygen gas at 350 °C for 2 hours and reduced with hydrogen gas at 400 °C for 2 hours. Total amount of impregnated metal, acidity and surface are of the samples were determined by using atomic absorption spectrophotometric, gravimetric and gas sorption methods, respectively. The activity test was done in a fixed bed reactor and the results of the reaction were analyzed by using gas chromatograph. The result of the characterization showed that the higher total amount of impregnated metal, the lower the surface area and total volume of pores. The acidity and the catalyst activity increase with the increasing of the total amount of impregnated metal. The flow rate of feed and temperature reaction also influence yield conversion. The optimum yield of n-octanol ...

EduChemia (Jurnal Kimia dan Pendidikan), 2021

This study aims to develop recitation-based teaching materials for learning qualitative analysis ... more This study aims to develop recitation-based teaching materials for learning qualitative analysis of cations. The procedure for developing teaching materials adopts the 4-D development model (Define, Design, Develop, Dissemination) from Thiagarajan. The development results were tested theoretically and empirically. The theoretical feasibility test was carried out using expert judgment, including chemist expert, pedagogic expert, and learning media. Empirical feasibility was tested through legibility tests and limited implementation tests. Based on the expert assessment, the recitation method based teaching materials developed in this study is content valid with individual readability of 87,86% and group readability of 89,32%. The results of testing the implementation of teaching materials in the learning process showed that recitation-based teaching materials were effective, in guiding students to do independent learning activities with an effectiveness of 84,16%. The use of Cation Qualitative Analysis teaching materials based on the recitation method in online learning is effective in increasing student understanding of qualitative analysis of cations with an N-gain value of 0,81. The students' ability to complete study assignments with the help of worksheets on teaching materials has a positive correlation, with an increase in concept understanding (r = 0,91) with a contribution value of 88,43%.

Jurnal Tadris Kimiya, 2018

Penelitian ini bertujuan untuk mendeskripsikan kemampuan menemukan konsep dan kemampuan memahami ... more Penelitian ini bertujuan untuk mendeskripsikan kemampuan menemukan konsep dan kemampuan memahami konsep larutan elektrolit dan larutan nonelektrolit dalam pembelajaran menggunakan Lembar Kerja Siswa (LKS) dengan alur berpikir induktif siswa kelas X MIA-1 SMA Negeri 2 Palangka Raya tahun ajaran 2014/2015. Penelitian ini melibatkan 34 siswa kelas X. Data kemampuan menemukan konsep larutan elektrolit dan larutan nonelektrolit dikumpulkan dengan menggunakan instrumen LKS, sedangkan data pemahaman konsep larutan elektrolit dan larutan nonelektrolit dikumpulkan menggunakan soal tes pemahaman konsep bentuk uraian objektif. Validitas isi LKS dan soal tes pemahaman konsep ditentukan berdasarkan content validity coefficient menggunakan formula Aiken's V. Analisis data menggunakan statistik deskriptif untuk mendeskripsikan kemampuan siswa menemukan dan memahami konsep larutan elektrolit dan larutan nonelektrolit. Hasil penelitian menunjukkan bahwa kemampuan siswa menemukan konsep tentang larutan elektrolit dan larutan nonelektrolit dalam pembelajaran menggunakan LKS induktif rata-rata sebesar 91,17%. Kemampuan siswa memahami konsep tentang larutan elektrolit dan larutan nonelektrolit dalam pembelajaran menggunakan LKS induktif rata-rata sebesar 80,59% yang tergolong dalam kategori baik. Siswa yang memiliki kemampuan menemukan konsep yang lebih baik cenderung menunjukkan pemahaman konsep yang lebih baik pula. Kata kunci: penemuan konsep, pemahaman konsep, elektrolit, larutan nonelektrolit, lembar kerja induktif.

PROSIDING SEMINAR NASIONAL PENDIDIKAN FISIKA "MOTOGPE", May 27, 2018

The concept of compound nomenclature and reaction equation is one of the chemical concepts taught... more The concept of compound nomenclature and reaction equation is one of the chemical concepts taught in high school class X. This study aims to describe the mastery of the concept of compound nomenclature and reaction equations in class XI students. This research is a descriptive qualitative research. The subjects of this study were 30 students of class XI IPA-4 of SMA Negeri 2 Sampit in the 2018/2019 school year who had received compound nomenclature learning and reaction equations. Data collected in the form of RPP documents obtained from chemistry teachers, students' concept mastery data obtained through the description test with a total of 14 items from 4 indicators and data from student interviews. The results showed that students' mastery of concepts on the topic of compound nomenclature and student reaction equations that amounted to 74.18% were in the high category. Mastery of student concepts is divided into 3 (three) categories, namely very high, high, and moderate. S...

Kimia memiliki beberapa jenis konsep dari segi dimensinya, salah satunya adalah keabstrakan. Sist... more Kimia memiliki beberapa jenis konsep dari segi dimensinya, salah satunya adalah keabstrakan. Sistem periodik unsur merupakan salah satu materi dalam kimia yang bersifat abstrak. Tujuan penelitian ini adalah untuk mendeskripsikan penguasaan konsep siswa kelas X MIPA 7 SMA Negeri 1 Palangka Raya. Subjek penelitian ini adalah 28 siswa kelas X MIPA 7 SMA Negeri 1 Palangka Raya tahun ajaran 2018/2019 yang sudah menerima pembelajaran sistem periodik unsur. Data penelitian ini berupa dokumen RPP yang didapat dari guru yang bersangkutan, data penguasaan konsep yang didapat melalui tes uraian sistem periodik unsur berjumlah 11 butir soal dari 3 indikator dan data hasil wawancara siswa. Data-data yang diperoleh kemudian dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa profil penguasaan konsep siswa pada topik sistem periodik unsur yaitu sebesar 61,7% dan berada pada kategori sedang. Penguasaan konsep siswa terbagi kedalam 2 kategori yaitu tinggi dan sedang. Sebanya...

Jurnal Ilmiah Kanderang Tingang, Mar 3, 2020

Jurnal Ilmiah Kanderang Tingang, Mar 12, 2020

Struktur atom merupakan salah satu materi pelajaran kimia yang diajarkan di SMA/MA. Materi ini di... more Struktur atom merupakan salah satu materi pelajaran kimia yang diajarkan di SMA/MA. Materi ini dipelajari dikelas X SMA tentang perkembangan teori atom, partikel dasar penyusun atom, konfigurasi elektron, serta bilangan kuantum. Konsep ini merupakan konsep dasar ilmu kimia untuk memahami ikatan kimia. Penelitian ini bertujuan untuk mendeskripsikan profil penguasaan konsep Struktur Atom pada siswa kelas X SMA. Penelitian ini merupakan jenis penelitian deskriptif yang dilaksanakan di SMA Negeri 4 Palangka Raya dengan subjek penelitian adalah 30 siswa kelas X MIPA-1. Data yang digunakan pada penelitian ini berupa dokumen RPP guru kimia yang bersangkutan, data penguasaan konsep siswa yang didapat melalui tes uraian, dan data hasil wawancara siswa. Hasil penelitian menunjukkan 1) rata-rata sebesar 62,16% berada pada kategori sedang. 2) Siswa dapat menjelaskan perkembangan teori atom untuk menunjukkan kelebihan dan kekurangan masing-masing teori atom dengan rata-rata penguasaan konsep sebesar 68,75% dengan kategori sedang. 3) Siswa dapat menentukan partikel dasar (proton, elektron, dan neutron) suatu atom berdasarkan nomor atom dan nomor massa dengan rata-rata penguasaan konsep sebesar 61,47% dengan kategori sedang. 4) Siswa dapat mengklasifikasi unsur ke dalam isotop, isobar, dan isoton dengan rata-rata penguasaan konsep sebesar 88,88% dengan kategori tinggi. 5) Siswa dapat menentukan bilangan kuantum pada elektron terluar dari suatu unsur atau ion dengan rata-rata penguasaan konsep sebesar 21,04% dengan kategori rendah. Kata Kunci: konsep, penguasaan, profil, struktur atom PENDAHULUAN Pendidikan di Indonesia telah diatur dalam Undang-Undang Nomor 20 Tahun 2003 tentang Sistem Pendidikan Nasional (SISDIKNAS). Menurut UU.RI.No.20 Tahun 2003 sistem pendidikan nasional mempunyai visi terwujudnya sistem pendidikan sebagai pranata sosial yang kuat dan berwibawa untuk memberdayakan semua warga negara indonesia berkembang menjadi manusia yang berkualitas sehingga mampu dan proaktif menjawab tatangan zaman yang selalu berubah (Arifin, 2011).

Jurnal Sains dan Terapan Kimia, Oct 3, 2017

Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan sebagai ... more Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan sebagai adsorben zat warna methylene blue dalam sistem larutan. Sintesis komposit lempung alam magnetit dilakukan dengan aktivasi asam terhadap lempung alam, selanjutnya dikompositkan dengan magnetit menggunakan metode kopresipitasi dengan rasio mol Fe 2+ : Fe 3+ = 1 : 2 pada temperatur 85 ο C. Karakterisasi terhadap hasil sintesis dilakukan dengan XRD dan FTIR. Adsorpsi dilakukan menggunakan sistem batch, dengan kajian adsorpsi yang dipelajari meliputi pH optimum, kinetika adsorpsi dan kesetimbangan adsorpsi. Hasil karakterisasi menunjukkan bahwa oksida besi Fe 3 O 4 (magnetit) dapat terkompositkan dengan lempung alam. lempung alam teraktivasi dan lempung alam magnetik komposit mampu mengadsorpsi methylene blue dalam larutan dengan adsorpsi optimal terjadi pada pH 3. Adsorpsi methylene blue oleh kedua jenis adsorben mengikuti persamaan kinetika orde dua semu dengan konstanta laju adsorpsi k 2 untuk lempung alam teraktivasi dan lempung alam magnetik masing-masing sebesar 11,85 x 10-2 dan 43,20 10-3 g/mg.menit. Pola adsorpsi adalah isoterm Langmuir dengan kapasitas adsorpsi berturut-turut sebesar 1,74 x 10-4 mol/g dan 2,79 x 10-4 mol/g. Model kinetika reaksi ini menunjukan bahwa komposit lempung alam magnetit hasil sintesis mampu menyerap methylen blue dalam larutan dan mempercepat proses pemisahan partikel adsorben dari larutan dengan medan magnet eksternal.

Molekul

Clay is a natural material from crystalline silicate with layered structures, has high cation exc... more Clay is a natural material from crystalline silicate with layered structures, has high cation exchange capacity, and large surface area. These advantages can be used as an adsorbent for the removal of contaminants in aqueous solutions, such as heavy metals and dyes. In Indonesia, clays from Java, Sulawesi, and Sumatra islands have been used as adsorbent, furniture, and construction materials. Due to limited information about basic characteristics of clay from Kalimantan, this clay has not been utilized well. Therefore, natural clay from Kalimantan, especially in Central Kalimantan, was used as adsorbent of cationic dyes in this present study. However, the clay has difficulty for separating the solid phase from aqueous solution after adsorption process. To solve this problem, combining clay with magnetic material was opted. The objectives of this study are to synthesize the magnetic composite material from natural clay by coprecipitation method and to characterize the synthesized mag...

Molekul, May 31, 2018

Clay is a natural material from crystalline silicate with layered structures, has high cation exc... more Clay is a natural material from crystalline silicate with layered structures, has high cation exchange capacity, and large surface area. These advantages can be used as an adsorbent for the removal of contaminants in aqueous solutions, such as heavy metals and dyes. In Indonesia, clays from Java, Sulawesi, and Sumatra islands have been used as adsorbent, furniture, and construction materials. Due to limited information about basic characteristics of clay from Kalimantan, this clay has not been utilized well. Therefore, natural clay from Kalimantan, especially in Central Kalimantan, was used as adsorbent of cationic dyes in this present study. However, the clay has difficulty for separating the solid phase from aqueous solution after adsorption process. To solve this problem, combining clay with magnetic material was opted. The objectives of this study are to synthesize the magnetic composite material from natural clay by coprecipitation method and to characterize the synthesized magnetic composite material using an x-ray diffraction method, transmission electron microscopy, and vibrating sample magnetometer. The adsorption properties of the synthesized magnetic composite material were evaluated using rhodamine B and methylene blue dyes in aqueous solution. Before magnetic composite material was synthesized, the clay was previously being activated for removing impurities. The magnetic material formed in the structure of clay had magnetite with particle size of 2.75 nm and the magnetization value of 24.91emu/g. The adsorption capacities of natural clay, activated clay, and magnetic composite of clay in rhodamine B were 34.29, 76.27, and 81.46 mg/g, respectively, while in methylene blue were 30.25, 83.92, and 133.90 mg/g, respectively. These results suggested that magnetic composite of clay can increase the adsorption capacities against dyes and accelerate the separation of the adsorbent solid phase from aqueous solution with largest adsorption capacity on methylene blue dye.

Molekul

Clay is a natural material that has been widely applied as a low-cost adsorbent for removing vari... more Clay is a natural material that has been widely applied as a low-cost adsorbent for removing various contaminants from wastewater. To improve its characteristics and activity, natural clay from Central Kalimantan was activated by acid and calcination treatments, then synthesized with magnetite (Fe3O4) in nanocomposite by co-precipitation method. The obtained nanocomposite was further characterized by Fourier transform infrared spectroscopy, X-ray diffraction, nitrogen adsorption, vibrating sample magnetometry, and transmission electron microscopy methods. The results showed that co-precipitation method has been successfully produced clay-magnetite nanocomposite from activated clay with specific surface area, saturation magnetization, and particle size were 37.458 m2/g, 24.910 emu/g, and 50 nm, respectively. The obtained natural clay, activated clay, and clay-magnetite nanocomposite were then evaluated for adsorptive removal of naphthol blue black (NBB) synthetic dye from wastewater ...

BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan, 2021

Danau Sadar Village is a village located in the sub-district of Dusun Selatan, 8 km from Buntok, ... more Danau Sadar Village is a village located in the sub-district of Dusun Selatan, 8 km from Buntok, the capital of South Barito Regency. This village has several potentials such as rubber plantation, livestock sector, tourism, and fisheries sector. Even though this potential is quite remarkable, the citizen welfare is still in low catagories due to the lack of skill in managing it. This condition happened because not all workers are engaged in the production process. Related to the condition of the community in Danau Sadar Village, an idea emerged to empower the community, by providing training to improve their skills. The objectives of community service in Danau Sadar Village are as follows: (1) assisting the people of Danau Sadar Village in developing economic independence; (2) improving entrepreneurial skills through the training provided. The community service program has been successful by carrying out two types of training activities to improve citizen welfare: training on biogas...

ABSTRAK Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan ... more ABSTRAK Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan sebagai adsorben zat warna methylene blue dalam sistem larutan. Sintesis komposit lempung alam magnetit dilakukan dengan aktivasi asam terhadap lempung alam, selanjutnya dikompositkan dengan magnetit menggunakan metode kopresipitasi dengan rasio mol Fe 2+ : Fe 3+ = 1 : 2 pada temperatur 85 ο C. Karakterisasi terhadap hasil sintesis dilakukan dengan XRD dan FTIR. Adsorpsi dilakukan menggunakan sistem batch, dengan kajian adsorpsi yang dipelajari meliputi pH optimum, kinetika adsorpsi dan kesetimbangan adsorpsi. Hasil karakterisasi menunjukkan bahwa oksida besi Fe 3 O 4 (magnetit) dapat terkompositkan dengan lempung alam. lempung alam teraktivasi dan lempung alam magnetik komposit mampu mengadsorpsi methylene blue dalam larutan dengan adsorpsi optimal terjadi pada pH 3. Adsorpsi methylene blue oleh kedua jenis adsorben mengikuti persamaan kinetika orde dua semu dengan konstanta laju adsorp...

Indonesian Journal of Chemistry, 2010

Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCl4 solution. After s... more Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCl4 solution. After separation, the sample was dried and calcinated at 550 °C for 4 hours under nitrogen stream. Furthermore, the sample was oxidized with oxygen gas at 350 °C for 2 hours and reduced with hydrogen gas at 400 °C for 2 hours. Total amount of impregnated metal, acidity and surface are of the samples were determined by using atomic absorption spectrophotometric, gravimetric and gas sorption methods, respectively. The activity test was done in a fixed bed reactor and the results of the reaction were analyzed by using gas chromatograph. The result of the characterization showed that the higher total amount of impregnated metal, the lower the surface area and total volume of pores. The acidity and the catalyst activity increase with the increasing of the total amount of impregnated metal. The flow rate of feed and temperature reaction also influence yield conversion. The optimum yield of n-octanol ...

EduChemia (Jurnal Kimia dan Pendidikan), 2021

This study aims to develop recitation-based teaching materials for learning qualitative analysis ... more This study aims to develop recitation-based teaching materials for learning qualitative analysis of cations. The procedure for developing teaching materials adopts the 4-D development model (Define, Design, Develop, Dissemination) from Thiagarajan. The development results were tested theoretically and empirically. The theoretical feasibility test was carried out using expert judgment, including chemist expert, pedagogic expert, and learning media. Empirical feasibility was tested through legibility tests and limited implementation tests. Based on the expert assessment, the recitation method based teaching materials developed in this study is content valid with individual readability of 87,86% and group readability of 89,32%. The results of testing the implementation of teaching materials in the learning process showed that recitation-based teaching materials were effective, in guiding students to do independent learning activities with an effectiveness of 84,16%. The use of Cation Qualitative Analysis teaching materials based on the recitation method in online learning is effective in increasing student understanding of qualitative analysis of cations with an N-gain value of 0,81. The students' ability to complete study assignments with the help of worksheets on teaching materials has a positive correlation, with an increase in concept understanding (r = 0,91) with a contribution value of 88,43%.

Jurnal Tadris Kimiya, 2018

Penelitian ini bertujuan untuk mendeskripsikan kemampuan menemukan konsep dan kemampuan memahami ... more Penelitian ini bertujuan untuk mendeskripsikan kemampuan menemukan konsep dan kemampuan memahami konsep larutan elektrolit dan larutan nonelektrolit dalam pembelajaran menggunakan Lembar Kerja Siswa (LKS) dengan alur berpikir induktif siswa kelas X MIA-1 SMA Negeri 2 Palangka Raya tahun ajaran 2014/2015. Penelitian ini melibatkan 34 siswa kelas X. Data kemampuan menemukan konsep larutan elektrolit dan larutan nonelektrolit dikumpulkan dengan menggunakan instrumen LKS, sedangkan data pemahaman konsep larutan elektrolit dan larutan nonelektrolit dikumpulkan menggunakan soal tes pemahaman konsep bentuk uraian objektif. Validitas isi LKS dan soal tes pemahaman konsep ditentukan berdasarkan content validity coefficient menggunakan formula Aiken's V. Analisis data menggunakan statistik deskriptif untuk mendeskripsikan kemampuan siswa menemukan dan memahami konsep larutan elektrolit dan larutan nonelektrolit. Hasil penelitian menunjukkan bahwa kemampuan siswa menemukan konsep tentang larutan elektrolit dan larutan nonelektrolit dalam pembelajaran menggunakan LKS induktif rata-rata sebesar 91,17%. Kemampuan siswa memahami konsep tentang larutan elektrolit dan larutan nonelektrolit dalam pembelajaran menggunakan LKS induktif rata-rata sebesar 80,59% yang tergolong dalam kategori baik. Siswa yang memiliki kemampuan menemukan konsep yang lebih baik cenderung menunjukkan pemahaman konsep yang lebih baik pula. Kata kunci: penemuan konsep, pemahaman konsep, elektrolit, larutan nonelektrolit, lembar kerja induktif.

PROSIDING SEMINAR NASIONAL PENDIDIKAN FISIKA "MOTOGPE", May 27, 2018

The concept of compound nomenclature and reaction equation is one of the chemical concepts taught... more The concept of compound nomenclature and reaction equation is one of the chemical concepts taught in high school class X. This study aims to describe the mastery of the concept of compound nomenclature and reaction equations in class XI students. This research is a descriptive qualitative research. The subjects of this study were 30 students of class XI IPA-4 of SMA Negeri 2 Sampit in the 2018/2019 school year who had received compound nomenclature learning and reaction equations. Data collected in the form of RPP documents obtained from chemistry teachers, students' concept mastery data obtained through the description test with a total of 14 items from 4 indicators and data from student interviews. The results showed that students' mastery of concepts on the topic of compound nomenclature and student reaction equations that amounted to 74.18% were in the high category. Mastery of student concepts is divided into 3 (three) categories, namely very high, high, and moderate. S...

Kimia memiliki beberapa jenis konsep dari segi dimensinya, salah satunya adalah keabstrakan. Sist... more Kimia memiliki beberapa jenis konsep dari segi dimensinya, salah satunya adalah keabstrakan. Sistem periodik unsur merupakan salah satu materi dalam kimia yang bersifat abstrak. Tujuan penelitian ini adalah untuk mendeskripsikan penguasaan konsep siswa kelas X MIPA 7 SMA Negeri 1 Palangka Raya. Subjek penelitian ini adalah 28 siswa kelas X MIPA 7 SMA Negeri 1 Palangka Raya tahun ajaran 2018/2019 yang sudah menerima pembelajaran sistem periodik unsur. Data penelitian ini berupa dokumen RPP yang didapat dari guru yang bersangkutan, data penguasaan konsep yang didapat melalui tes uraian sistem periodik unsur berjumlah 11 butir soal dari 3 indikator dan data hasil wawancara siswa. Data-data yang diperoleh kemudian dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa profil penguasaan konsep siswa pada topik sistem periodik unsur yaitu sebesar 61,7% dan berada pada kategori sedang. Penguasaan konsep siswa terbagi kedalam 2 kategori yaitu tinggi dan sedang. Sebanya...

Jurnal Ilmiah Kanderang Tingang, Mar 3, 2020

Jurnal Ilmiah Kanderang Tingang, Mar 12, 2020

Struktur atom merupakan salah satu materi pelajaran kimia yang diajarkan di SMA/MA. Materi ini di... more Struktur atom merupakan salah satu materi pelajaran kimia yang diajarkan di SMA/MA. Materi ini dipelajari dikelas X SMA tentang perkembangan teori atom, partikel dasar penyusun atom, konfigurasi elektron, serta bilangan kuantum. Konsep ini merupakan konsep dasar ilmu kimia untuk memahami ikatan kimia. Penelitian ini bertujuan untuk mendeskripsikan profil penguasaan konsep Struktur Atom pada siswa kelas X SMA. Penelitian ini merupakan jenis penelitian deskriptif yang dilaksanakan di SMA Negeri 4 Palangka Raya dengan subjek penelitian adalah 30 siswa kelas X MIPA-1. Data yang digunakan pada penelitian ini berupa dokumen RPP guru kimia yang bersangkutan, data penguasaan konsep siswa yang didapat melalui tes uraian, dan data hasil wawancara siswa. Hasil penelitian menunjukkan 1) rata-rata sebesar 62,16% berada pada kategori sedang. 2) Siswa dapat menjelaskan perkembangan teori atom untuk menunjukkan kelebihan dan kekurangan masing-masing teori atom dengan rata-rata penguasaan konsep sebesar 68,75% dengan kategori sedang. 3) Siswa dapat menentukan partikel dasar (proton, elektron, dan neutron) suatu atom berdasarkan nomor atom dan nomor massa dengan rata-rata penguasaan konsep sebesar 61,47% dengan kategori sedang. 4) Siswa dapat mengklasifikasi unsur ke dalam isotop, isobar, dan isoton dengan rata-rata penguasaan konsep sebesar 88,88% dengan kategori tinggi. 5) Siswa dapat menentukan bilangan kuantum pada elektron terluar dari suatu unsur atau ion dengan rata-rata penguasaan konsep sebesar 21,04% dengan kategori rendah. Kata Kunci: konsep, penguasaan, profil, struktur atom PENDAHULUAN Pendidikan di Indonesia telah diatur dalam Undang-Undang Nomor 20 Tahun 2003 tentang Sistem Pendidikan Nasional (SISDIKNAS). Menurut UU.RI.No.20 Tahun 2003 sistem pendidikan nasional mempunyai visi terwujudnya sistem pendidikan sebagai pranata sosial yang kuat dan berwibawa untuk memberdayakan semua warga negara indonesia berkembang menjadi manusia yang berkualitas sehingga mampu dan proaktif menjawab tatangan zaman yang selalu berubah (Arifin, 2011).

Jurnal Sains dan Terapan Kimia, Oct 3, 2017

Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan sebagai ... more Sintesis komposit lempung alam magnetit telah dilakukan. Komposit kemudian diaplikasikan sebagai adsorben zat warna methylene blue dalam sistem larutan. Sintesis komposit lempung alam magnetit dilakukan dengan aktivasi asam terhadap lempung alam, selanjutnya dikompositkan dengan magnetit menggunakan metode kopresipitasi dengan rasio mol Fe 2+ : Fe 3+ = 1 : 2 pada temperatur 85 ο C. Karakterisasi terhadap hasil sintesis dilakukan dengan XRD dan FTIR. Adsorpsi dilakukan menggunakan sistem batch, dengan kajian adsorpsi yang dipelajari meliputi pH optimum, kinetika adsorpsi dan kesetimbangan adsorpsi. Hasil karakterisasi menunjukkan bahwa oksida besi Fe 3 O 4 (magnetit) dapat terkompositkan dengan lempung alam. lempung alam teraktivasi dan lempung alam magnetik komposit mampu mengadsorpsi methylene blue dalam larutan dengan adsorpsi optimal terjadi pada pH 3. Adsorpsi methylene blue oleh kedua jenis adsorben mengikuti persamaan kinetika orde dua semu dengan konstanta laju adsorpsi k 2 untuk lempung alam teraktivasi dan lempung alam magnetik masing-masing sebesar 11,85 x 10-2 dan 43,20 10-3 g/mg.menit. Pola adsorpsi adalah isoterm Langmuir dengan kapasitas adsorpsi berturut-turut sebesar 1,74 x 10-4 mol/g dan 2,79 x 10-4 mol/g. Model kinetika reaksi ini menunjukan bahwa komposit lempung alam magnetit hasil sintesis mampu menyerap methylen blue dalam larutan dan mempercepat proses pemisahan partikel adsorben dari larutan dengan medan magnet eksternal.

Molekul

Clay is a natural material from crystalline silicate with layered structures, has high cation exc... more Clay is a natural material from crystalline silicate with layered structures, has high cation exchange capacity, and large surface area. These advantages can be used as an adsorbent for the removal of contaminants in aqueous solutions, such as heavy metals and dyes. In Indonesia, clays from Java, Sulawesi, and Sumatra islands have been used as adsorbent, furniture, and construction materials. Due to limited information about basic characteristics of clay from Kalimantan, this clay has not been utilized well. Therefore, natural clay from Kalimantan, especially in Central Kalimantan, was used as adsorbent of cationic dyes in this present study. However, the clay has difficulty for separating the solid phase from aqueous solution after adsorption process. To solve this problem, combining clay with magnetic material was opted. The objectives of this study are to synthesize the magnetic composite material from natural clay by coprecipitation method and to characterize the synthesized mag...

Molekul, May 31, 2018

Clay is a natural material from crystalline silicate with layered structures, has high cation exc... more Clay is a natural material from crystalline silicate with layered structures, has high cation exchange capacity, and large surface area. These advantages can be used as an adsorbent for the removal of contaminants in aqueous solutions, such as heavy metals and dyes. In Indonesia, clays from Java, Sulawesi, and Sumatra islands have been used as adsorbent, furniture, and construction materials. Due to limited information about basic characteristics of clay from Kalimantan, this clay has not been utilized well. Therefore, natural clay from Kalimantan, especially in Central Kalimantan, was used as adsorbent of cationic dyes in this present study. However, the clay has difficulty for separating the solid phase from aqueous solution after adsorption process. To solve this problem, combining clay with magnetic material was opted. The objectives of this study are to synthesize the magnetic composite material from natural clay by coprecipitation method and to characterize the synthesized magnetic composite material using an x-ray diffraction method, transmission electron microscopy, and vibrating sample magnetometer. The adsorption properties of the synthesized magnetic composite material were evaluated using rhodamine B and methylene blue dyes in aqueous solution. Before magnetic composite material was synthesized, the clay was previously being activated for removing impurities. The magnetic material formed in the structure of clay had magnetite with particle size of 2.75 nm and the magnetization value of 24.91emu/g. The adsorption capacities of natural clay, activated clay, and magnetic composite of clay in rhodamine B were 34.29, 76.27, and 81.46 mg/g, respectively, while in methylene blue were 30.25, 83.92, and 133.90 mg/g, respectively. These results suggested that magnetic composite of clay can increase the adsorption capacities against dyes and accelerate the separation of the adsorbent solid phase from aqueous solution with largest adsorption capacity on methylene blue dye.