James Sibarani - Academia.edu (original) (raw)

Papers by James Sibarani

Jurnal Kimia, 2021

Modifikasi zeolit mangan dengan TiO2 sebagai filter gas buang kendaraan bermotor telah berhasil d... more Modifikasi zeolit mangan dengan TiO2 sebagai filter gas buang kendaraan bermotor telah berhasil dibuat dengan mencampurkan zeolit mangan dan TiO2 serta Poly Vinyl Alcohol (PVA) sebagai perekat. Pembuatan filter dilakukan dengan metode reaksi padat-padat (solid State Reaction) kemudian dikarakterisasi struktur dan kristalinitas kristal menggunakan X-Ray Diffraction (XRD) dan morfologi serta komposisi kimia menggunakan Electron Microscopy - Energy Dispersive Spectroscopy (SEM-EDS). Hasil karakterisasi XRD dan SEM-EDS menunjukan bahwa penambahan TiO2 tidak mempengaruhi struktur kristal dari zeolit mangan yang dapat dilihat dari tidak adanya perubahan dspacing yang spesifik dan tidak terjadi pergeseran sudut 2?, namun terjadi penurunan intensitas puncak difraksi yang menandakan adanya penurunan persen massa salah satu komponen zeolit mangan yakni SiO2. Selanjutnya dilakukan pengujian performa filter dalam penurunan kadar gas CO dan HC menggunakan Gas Analyzer dan Spektrofotometer Serapa...

Journal of Physics: Conference Series, 2019

This paper reports the use of Fe2O3 intercalated bentonite as a photocatalyst to degrade remazol ... more This paper reports the use of Fe2O3 intercalated bentonite as a photocatalyst to degrade remazol brilliant blue. The photodegradation was conducted by irradiating aqueous solution of the coloring agent and Fe2O3 intercalated bentonite with UV ray at 259 nm. The degradation percentages were observed at various pH, photocatalyst mass, and irradiation duration to obtain the optimum condition of the photodegradation. The observation showed that the optimal photodegradation occurred at pH 4, using 100 mg bentonite-Fe2O3, irradiated for 2 hours. The proses can degrade effectively 200 ppm remazol brilliant blue with a percentage of 98.20 ± 0.07%.

Buletin Udayana Mengabdi

As a nonformal education institution for students that dropped-out of schools, pusat kegiatan bel... more As a nonformal education institution for students that dropped-out of schools, pusat kegiatan belajar masyarakat (PKBM) plays important role in promoting the spirit of lifelong learning and community learning. One of the fundamental components of education, either formal or nonformal, is writing. The ability to write, especially scientific writing, is not an inborn talent but acquired. Results of interview conducted in early February 2019 concluded the followings. First, students are not capable of doing scientific writing correctly. This can be seen from their inability in creating cohesive and coherence sentences. Second, the students seem to lack confidence when participating in writing competition held regularly by Kemdikbud. Finally, the workplace often requires employees to make correspondence and written reports. One way to improve students’ ability to write scientifically is through basic scientific writing workshop. This community service started by giving questionnaires to...

KOVALEN: Jurnal Riset Kimia

Nanotechnology is a technology that can be used to overcome several environmental problems. Synth... more Nanotechnology is a technology that can be used to overcome several environmental problems. Synthesis of silver nanoparticles (AgNPs) mediated with basil leaf bioreductant with a concentration 0.5% at a temperature of 25⁰C has been carried out. The result of biosynthesis of AgNPs was analyzed using a UV-Vis spectrophotometer in which the SPR band showed the maximum wavelength of 429 nm. The size of AgNPs was determined by a Particle Size Analyzer (PSA), which its size was 86.83 nm. The morphology and elemental content of AgNPs were confirmed using SEM-EDS showing that the shape of AgNPs was irregularly spherical crystals while the EDS results showed a dominant peak at 3 keV indicating silver content. AgNPs showed strong antibacterial activity against Escherechia coli and moderate against Staphylococcus aureus.

Abstract The objectives of this research are to determine the optimum conditions (pH, concentrati... more Abstract The objectives of this research are to determine the optimum conditions (pH, concentration of fungi, and incubation period) of degradation of textile dyeing waste using Daedaleopsis eff. confragosa and to determine the quality of the processed waste based on the parameters of chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended solids (TSS), pH, and its color. The fungi was collected from a plantation areal in Negara, Bali and the untreated waste itself was also collected from a home textile dyeing industry in Negara, Bali. After rejuvenation process of the fungi, the optimum conditions were obtained by collecting the COD data at various pH (4 - 10) and concentration of fungi (3% - 9%).We found that the degradation will be optimally progressing at pH 4 and fungi concentration of 6%. Finally, the optimum period of degradation was determined by varying the incubation day from 0 - 12 days at optimum conditions. The optimum incubation period was 9 days. The treatment of the dyeing waste with fungi can decrease the level of the color, TSS, COD and BOD5 up to 81.05%, 70.21%, 85.17%, and 74.09% respectively.

11th International Conference on Miniaturized Systems for Chemistry and Life Sciences, uTAS 2007, 2007

Indonesian Journal of Cancer, 2013

Telah dilakukan uji antikanker isolat toksik 3 (tiga) jenis spons yang berasal dari perairan Indo... more Telah dilakukan uji antikanker isolat toksik 3 (tiga) jenis spons yang berasal dari perairan Indonesia. Ketiga spons tersebut adalah Callyspongia aerizusa , Haliclona fascigera , dan Lanthella basta . Isolasi metabolit dalam spons dilakukan dengan cara maserasi, kemudian dilanjutkan dengan tahap pemisahan dan pemurnian menggunakan cara partisi serta kromatografi kolom. Skrining toksisitas dilakukan dengan metode Bhrine Shrimp Lethality Test (BSLT) . Uji antikanker secara in vitro isolat yang paling toksik menggunakan sel HeLa. Berdasarkan hasil penelitian ini diperoleh bahwa spons Callyspongia aerizusa bersifat sebagai antikanker dengan LC 50 sebesar 5,50 ppm. Spons Haliclona fascigera tidak bersifat antikanker terhadap sl HeLa, karena harga LC50 sebesar 44,67 ppm. Sedangkan spons Lanthella basta bersifat antikanker dengan harga LC 50 sebesar 18,62 ppm. Kata Kunci: aktivitas antikanker; Callyspongia aerizusa; Haliclona fascigera; Lanthella basta

MRS Proceedings, 2008

Preparation of nonbiofouling surface and micropatterned biorecognition layer over nonbiofouling f... more Preparation of nonbiofouling surface and micropatterned biorecognition layer over nonbiofouling for highly sensitive microarray biosensors, was conducted by constructing biocompatible poly(2-methacryloyloxyethyl phosphorylcholine(MPC)) brushes on polymer substrates based on living radical polymerization using macrophotoiniferters comprised of 2-ethylhexyl methacrylate (EHMA) and 4-vinylbenzyl N,N-diethyldithiocarbamate (VBDC). Protein adsorption on these modified surfaces significantly reduces compared to on polymeric substrate and the micropatterning consisted of poly(MPC) brush and biorecognition layer can be easily done by applying photomask with high fidelity.

Colloids and Surfaces B: Biointerfaces, 2007

This study aims to determine optimal valorization of textile dyeing by immobilized fungus Daedalo... more This study aims to determine optimal valorization of textile dyeing by immobilized fungus Daedalopsis Eff. Confragosa in sawdust as well as the quality of the valorization, which covers Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), Total Suspended Solids (TSS), pH, color, and level of toxicity. This fungus is obtained from plantation areas in Negara, Bali. Textile dyeing wastewater is taken from the Mama & Leon textile dyeing industry, Tabanan Bali. The optimum condition needed to process the dyeing waste is at pH 4 with eight days of incubation. Field-scale textile waste treatment in a reactor containing the immobilized fungus Daedaleopsis eff. confragosa in sawdust for eight days can reduce color, TSS, COD, and BOD by 79.78%, 779.11%, 88.307%, and 82.932%. Furthermore, textile waste processing results in a lower level of toxicity compared to the one before processing. The level of toxicity of wastewater before it is treated is mildly toxic. Meanwhile, the level of ...

ABSTRAK Penelitian transfer ion dopamin secara elektrokimia pada antarmuka air-nitrobenzena denga... more ABSTRAK Penelitian transfer ion dopamin secara elektrokimia pada antarmuka air-nitrobenzena dengan metode voltametri telah dilakukan. Pengukuran transfer ion ini menggunakan sistem 3 elektroda yaitu 2 elektroda Ag/AgCl sebagai elektroda kerja dan elektroda pembanding, dan elekroda platina sebagai elektroda pembantu.Penelitian diawali dengan pembuatan elektroda pembanding Ag/AgCl yang kemudian dilakukan karakterisasi terhadap elektroda tersebut. Kinetika transfer ion dopamin diketahui dengan melakukan perhitungan nilai potensial standar dan energi bebas Gibbs transfer ion dopamin melalui pengukuran larutan standar dopamin dan tetra metil amonium klorida (TMACl) dengan metode voltametri siklik. Hasil karakterisasi elektroda pembanding Ag/AgCl menunjukkan kelayakan elekroda dengan nilai slope sebesar 60,71 dan r = 0,9984. Potensial standar transfer ion dopamine adalah 0,173 V dan proses berlangsung secara spontan dengan perubahan energi bebas Gibbs (ΔG) sebesar -16,64 kJ/mol. Kata kunc...

ABSTRAK: Penelitian ini bertujuan untuk mengetahui konsentrasi asam laktat dan lama ekstraksi gel... more ABSTRAK: Penelitian ini bertujuan untuk mengetahui konsentrasi asam laktat dan lama ekstraksi gelatin dari kulit ayam yang terbaik berdasarkan sifat fisikokimia. Percobaan dirancang dengan Rancangan Acak Lengkap (RAL) pola faktorial dengan 2 faktor yaitu variasi konsentrasi asam laktat 1% (L 1 ), 2% (L 2 ), dan 3% (L 3 ) dengan variasi lama ektraksi 12 jam (T 1 ), 24 jam (T 2 ), dan 48 jam (T 3 ) dengan suhu 45 o C pada pH 4-5. Data rendemen, kekuatan gel, nilai pH, kadar air, kadar abu, kadar protein, dan kadar lemak dianalisis dengan ANOVA. Perbedaan data antar perlakuan diuji dengan uji beda nyata terkecil dan dilanjutkan dengan uji Duncan. Hasil penelitian menunjukkan bahwa kondisi optimum ekstrak gelatin dari kulit ayam adalah konsentrasi asam laktat 3% dan lama ekstraksi 48 jam (L 3 T 3 ) dengan karakteristik fisikokimia : kekuatan gel (81,20 g bloom), nilai pH (3,54), kadar air (0,23%), kadar abu (0,10%), kadar protein (87,60%), dan kadar lemak (3,81%). Gelatin kulit ayam y...

The study of photodegradation of Congo Red using UV light, with addition ZnO catalyst, H2O2 and F... more The study of photodegradation of Congo Red using UV light, with addition ZnO catalyst, H2O2 and Fe 2+ has been carried out. This study included the determination of optimum amount of ZnO, H2O2, Fe 2+ , pH optimum and the determination of system which shows the most effective in Congo Red photodegradation. The results showed that the optimum conditions to degradate 100 ppm of Congo Red solution were 60 mg of ZnO, 4 ml of H2O2 (0,0392 mol), 20 mg FeSO4 (0,0013 mol) and pH 5. The highest percentage of degradation was 93,6093 + 0,12 % reached using UV/ZnO/H2O2/ Fe 2+ system at 5 hour photodegradation time. In this processes addition of ZnO, H 2O2, and FeSO4, and pH were important parameters to increase the percentage of photodegradation.

Cakra Kimia, 2016

ABSTRAK : Pada penelitian ini telah dipelajari pengaruh penambahan katalis ZnO, H 2 O 2 , dan Fe ... more ABSTRAK : Pada penelitian ini telah dipelajari pengaruh penambahan katalis ZnO, H 2 O 2 , dan Fe 2+ terhadap fotodegradasi Rhodamin B. Penelitian ini meliputi penentuan jumlah ZnO, H 2 O 2 , FeSO 4 dan pH dalam penentuan efektivitas fotodegradasi pada kondisi optimum. Hasil menunjukkan bahwa kondisi optimum yang diperoleh untuk mendegradasi larutan Rhodamin B 100 ppm yaitu 60 mg ZnO, 6 mL H 2 O 2 , 25 mg FeSO 4 dan pH 4. Persentase degradasi tertinggi diperoleh pada sistem UV/ZnO/Reagen Fenton yaitu sebesar 91,55% dalam waktu degradasi 5 jam. Hasil penelitian menunjukkan bahwa semakin lama waktu irradiasi semakin banyak zat warna Rhodamin B yang terdegradasi. Pada penelitian ini waktu irradiasi optimum dicapai pada 5 jam. ABSTRACT : The study about the effect of addition of ZnO, H 2 O 2 and Fe 2+ on photodegradation of Rhodamine B has been carried out. The research included the determination of optimum amount of ZnO, optimum concentration of H 2 O 2 , FeSO 4 , and pH. The effective...

Tujuan dari penelitian ini adalah untuk menentukan konsentrasi optimum dan efektifitas hidrogen p... more Tujuan dari penelitian ini adalah untuk menentukan konsentrasi optimum dan efektifitas hidrogen peroksida dan pereaksi Fenton sebagai disinfektan dibandingkan dengan kaporit. Efektivitas disinfeksi ditentukan berdasarkan beberapa parameter yaitu: koefisien fenol disinfektan dan kualitas air yang dihasilkan yang diukur melalui pH, oksigen terlarut (DO, dissolved oxygen ), dan suhunya serta harga disinfektan itu sendiri. Analisis statistik ANOVA dua arah tanpa interaksi pada tingkat kesalahan 0.01 dilakukan guna menentukan disinfektan paling efektif dan konsentrasi optimumnya. Uji koefisien fenol dilakukan dengan mencampurkan disinfektan dengan konsentrasi tertentu dengan bakteri Salmonella typhosa dan Staphyllococcus aureus kemudian membandingkan hasilnya dengan fenol.Hasil pengamatan menunjukkan bahwa koefisien fenol dari kaporit, hidrogen peroksida, dan reagen Fenton berturut-turut adalah 4, 6, dan 6. Air yang dihasilkan oleh kaporit mempunyai pH, DO dan suhu berturut-turut adalah...