febri baskoro | Chang Gung University (original) (raw)

Papers by febri baskoro

Research paper thumbnail of Columnar liquid-crystalline triazine-based dendrimer with carbon nanotube filler for efficient organic lithium-ion batteries

Electrochimica Acta, Dec 1, 2022

Research paper thumbnail of Redox-active polynaphthalimides as versatile electrode materials for high-voltage, high-rate and long-cycle-life organic Li-ion batteries

Journal of materials chemistry. A, Materials for energy and sustainability, 2023

Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, a... more Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, anode, and binders in lithium-ion batteries simultaneously.

Research paper thumbnail of Co- and Ni-Based Electroactive Metal–Organic Frameworks for Stable Lithium Storage: Electrochemical and Charge-Storage Behavior in Response to Different Metal Centers

Crystal Growth & Design

Research paper thumbnail of Dicyanotriphenylamine-Based Polyimides as High-Performance Electrodes for Next Generation Organic Lithium-Ion Batteries

Aromatic polyimide (PI) derivatives have recently been investigated as redox-active electrode mat... more Aromatic polyimide (PI) derivatives have recently been investigated as redox-active electrode materials for Li-ion batteries because of their high thermal stability and thermo-oxidative stability complemented by excellent solvent resistance, good electrical and mechanical properties, and chemical resistance. In this work, we report two PI derivatives from a newly synthesized 4,4'-diamino-3″,4″-dicyanotriphenylamine (DiCN-TPA) monomer and two dianhydrides, pyromellitic dianhydride (PMDA) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA); designated as TPA-PMPI and TPA-NTCPI, respectively, as electrode materials for Li-ion batteries. Characterizations of the PIs reveal excellent thermal stability and bipolar property. The incorporation of DiCN-TPA into the polymer structure resulted to a disordered chain arrangement, thus giving high glass transition temperatures (Tg). Electrochemical performance tests reveal that TPA-NTCPI cathode delivered a reversible specific capacity of 150 mAh g-1 at 0.1 A g-1 and exhibited a stability up to 1000 cycles. On the other hand, TPA-PMPI anode delivered a high specific capacity of up to 1600 mAh g-1 at 0.1 A g-1 after 100 cycles. The electrochemical performance of TPA-NTCPI cathode and TPA-PMPI anode are both among the best compared with other reported aromatic PI-based electrodes. The long cycle lifetime and excellent battery performance further suggest that TPA-NTCPI and TPA-PMPI are promising organic electrode materials for next generation Li-ion batteries.

Research paper thumbnail of An Efficient and Reversible Battery Anode Electrode Derived from a Lead-Based MetalOrganic Framework

Research paper thumbnail of Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

Nanomaterials, 2020

This study investigates the permeance and rejection efficiencies of different dyes (Rhodamine B a... more This study investigates the permeance and rejection efficiencies of different dyes (Rhodamine B and methyl orange), folic acid and a protein (bovine serum albumin) using graphene oxide composite membrane. The ultrathin separation layer of graphene oxide (thickness of 380 nm) was successfully deposited onto porous polyvinylidene fluoride-polyacrylic acid intermediate layer on nonwoven support layer using vacuum filtration. The graphene oxide addition in the composite membrane caused an increased hydrophilicity and negative surface charge than those of the membrane without graphene oxide. In the filtration process using a graphene oxide composite membrane, the permeance values of pure water, dyes, folic acid and bovine serum albumin molecules were more severely decreased (by two orders of magnitude) than those of the nonwoven/polyvinylidene fluoride-polyacrylic acid composite membrane. However, the rejection efficiency of the graphene oxide composite was significantly improved in cati...

Research paper thumbnail of Facile Synthesis of Carboxylated Activated Carbon Using Green Approach for Water Treatment

IOP Conference Series: Materials Science and Engineering, 2019

A chemical treatment by using oxidizing agents is the most common methodology to modify or create... more A chemical treatment by using oxidizing agents is the most common methodology to modify or create functional groups on activated carbon. The modified activated carbon obtained from chemical oxidation needs further treatment and produced waste, therefore a new approach is needed. A facile green approach is reported. In this approach the activated carbon was oxidized using air without additional chemical treatment to increase the content of acidic surface functional groups, especially carboxyl groups. The formation of carboxyl groups was confirmed by Temperature Programmed Decomposition, Boehm titration, and Infra-red spectroscopy results. The Boehm titration result showed higher contents of carboxyl groups by three-fold. The carboxylated activated carbon synthesized by green approach showed excellent performance for water treatment.

Research paper thumbnail of Upaya Peningkatan Aktivitas Dan Prestasi Belajar Dengan Model Pembelajaran NHT (Numbered Head Together) Dilengkapi LKS Pada Materi Termokimia Siswa Kelas XI IPA-3 Sma Negeri 6 Surakarta

Jurnal Pendidikan Kimia, Apr 3, 2013

Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi ... more Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan aktivitas belajar siswa kelas XI IPA-3 pada materi Termokimia. 2) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan prestasi belajar siswa kelas XI IPA-3 pada materi Termokimia. Metode penelitian yang dilaksanakan adalah penelitian tindakan kelas yang terdiri dari dua siklus. Populasi dalam penelitian ini adalah siswa kelas XI IPA SMA Negeri 6 Surakarta tahun ajaran 2012/ 2013. Data penelitian yang diambil berupa prestasi belajar kognitif, afektif, aktivitas belajar siswa serta kepuasan belajar siswa sebagai gambaran tanggapan siswa terhadap pembelajaran yang berlangsung. Pengumpulan data dilakukan melalui observasi, tes prestasi kognitif, angket, wawancara, dan dokumentasi. Teknik analisis data yang digunakan adalah analisis deskriptif kualitatif. Hasil penelitian dan analisis yang telah dilakukan menunjukkan: 1) Model pembelajaran NHT (Numbered Head Together) dilengkapi LKS dapat meningkatkan aktivitas belajar siswa pada materi Termokimia. 2) Model pembelajaran NHT (Numbered Head Together) dilengkapi LKS dapat meningkatkan prestasi belajar materi Termokimia.

Research paper thumbnail of Redox-active polynaphthalimides as versatile electrode materials for high-voltage, high-rate and long-cycle-life organic Li-ion batteries

Journal of Materials Chemistry A

Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, a... more Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, anode, and binders in lithium-ion batteries simultaneously.

Research paper thumbnail of High-Performance Aramid Electrodes for High-Rate and Long Cycle-Life Organic Li-ion Battery

Journal of Materials Chemistry A

Aromatic polyamides, aramids, have recently drawn reasech attentions for energy storage applicati... more Aromatic polyamides, aramids, have recently drawn reasech attentions for energy storage applications due to their outstanding physical and chemical properties. In this work, we report three new aramids containing dicyanotriphenylamine...

Research paper thumbnail of Columnar Liquid-Crystalline Triazine-Based Dendrimer with Carbon Nanotube Filler for Efficient Organic Lithium-Ion Batteries

Research paper thumbnail of (Invited) Inorganic/Organic Hybride Perovskites for Energy-Related Applications

ECS Meeting Abstracts, 2021

State-of-the-art energy storage devices work by insertion/extraction of the alkali metal ions int... more State-of-the-art energy storage devices work by insertion/extraction of the alkali metal ions into a porous electrode material, where the overall capacity is strongly dependent on the accessibility of the host material interior to the ions. On the other hand, the performance stability depends on various factors governed by the specific constitution of the electrode. Here we show that molecularly engineered hybrid perovskites can be utilized in Lithium-ion batteries as anode materials with good performance. More hybrid perovskites can be targets for further optimization considering the structural diversity. We anticipate that these results open a new direction for the use of hybrid perovskites for energy storage applications.

Research paper thumbnail of Dual‐Ligand Zn‐Based Metal–Organic Framework as Reversible and Stable Anode Material for Next Generation Lithium‐Ion Batteries

Research paper thumbnail of Strategic Structural Design of a Gel Polymer Electrolyte toward a High Efficiency Lithium-Ion Battery

ACS Applied Energy Materials, 2019

Electrolytes have played critical roles in electrochemical energy storage. In Liion battery, liqu... more Electrolytes have played critical roles in electrochemical energy storage. In Liion battery, liquid electrolytes have shown their excellent performances for over decades, such as high ionic conductivity (~10 −3 S cm −1) and good contacts with electrodes. However, the use of liquid electrolytes often brought risks associated with leakage and combustion of organic electrolytes. Hence, polymer electrolytes become potential candidates to replace liquid electrolyte systems. Although solid polymer electrolytes (SPEs) offer better safety and good mechanical properties to take over liquid electrolytes, most of them only deliver low ionic conductivities (~10 −8 S cm −1) and poor contact with electrodes, results in poor cycle performance and low electrical capacity of the batteries. In addition, gel polymer electrolytes (GPEs) have received increasing research attention due to their relevant characteristics, which extend from liquid electrolytes and solid polymer electrolytes. In this review, state-ofthe-art of gel polymer electrolytes are elucidated with respect to their structural design and

Research paper thumbnail of Graphene oxide-cation interaction: Inter-layer spacing and zeta potential changes in response to various salt solutions

Journal of Membrane Science, 2018

The objective of this study is to investigate the interaction between graphene oxide (GO) laminat... more The objective of this study is to investigate the interaction between graphene oxide (GO) laminate and salt solutions. The well-aligned GO laminate is distributed on the top surface of a polyvinylidene fluoride-polyacrylic acid (PVDF-PAA) microporous layer via vacuum filtration. The PVDF-PAA layer was formed after being cast on a non-woven support and immersed in a water coagulation bath. We illustrate herein how the inter-layer spacing of the GO laminate membrane is varied due to contact with salt solutions or water, which results in tunable ionic sieving effect. The GO inter-layer spacing is calculated, and this spacing shrunk to 2.8 nm in the presence of MgSO 4 and enlarged to 6.1 nm with Na 2 SO 4 from the initial 4.8 nm of water-swollen GO. The permeance values of the filtrate from Na-solutions are unexpectedly higher than those of pure water. It is assumed that the water permeation through the GO composite membrane follows a modified Hagen-Poiseuille's law. The strong GO-Mg 2+ interaction causes the surface zeta potential toward a neutral charge, which results in low rejections (<12%) for MgSO 4 and MgCl 2 solutions. The intermediate GO-Na + interaction maintains the negative zeta potential of the GO layer, which readily rejects Na 2 SO 4 (79%). The cations can modulate surface zeta potential and inter-layer spacing, which in turn directly impact the anion permeation and salt rejection behaviors. Overall, GO-salt interaction plays an important role in tailoring GO membrane characteristics. These GO-cation behaviors have potential applications in water filtration, desalination, molecular separation, and ion sensing and detection.

Research paper thumbnail of Upaya Peningkatan Aktivitas Dan Prestasi Belajar Dengan Model Pembelajaran NHT (Numbered Head Together) Dilengkapi LKS Pada Materi Termokimia Siswa Kelas XI IPA-3 Sma Negeri 6 Surakarta

Jurnal Pendidikan Kimia, Apr 3, 2013

Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi ... more Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan aktivitas belajar siswa kelas XI IPA-3 pada materi Termokimia. 2) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan prestasi belajar siswa kelas XI IPA-3 pada materi Termokimia. Metode penelitian yang dilaksanakan adalah penelitian tindakan kelas yang terdiri dari dua siklus. Populasi dalam penelitian ini adalah siswa kelas XI IPA SMA Negeri 6 Surakarta tahun ajaran 2012/ 2013. Data penelitian yang diambil berupa prestasi belajar kognitif, afektif, aktivitas belajar siswa serta kepuasan belajar siswa sebagai gambaran tanggapan siswa terhadap pembelajaran yang berlangsung. Pengumpulan data dilakukan melalui observasi, tes prestasi kognitif, angket, wawancara, dan dokumentasi. Teknik analisis data yang digunakan adalah analisis deskriptif kualitatif. Hasil penelitian dan analisis yang telah dilakukan menunjukkan: 1) Model pembelajaran NHT (Numbered Head Together) dilengkapi LKS dapat meningkatkan aktivitas belajar siswa pada materi Termokimia. 2) Model pembelajaran NHT (Numbered Head Together ) dilengkapi LKS dapat meningkatkan prestasi belajar materi Termokimia.

Conference Presentations by febri baskoro

Research paper thumbnail of Graphene Oxide Nanosheet Framework on the Surface of Polyvinylidene Fluoride-co-Polyacrylic Acid Composite Membrane for Water Purification

In this work, graphene oxide was synthesized by modified Hummer’s method. Thin layer graphene oxi... more In this work, graphene oxide was synthesized by modified Hummer’s method. Thin layer graphene oxide nano-sheets framework was deposited on the top surface of porous polyvinylidene fluoride-co-polyacrylic acid (PVDF-PAA) composites membrane through vacuum filtration. The resulting membrane was investigated on nanofiltration (NF) system to evaluate its performance of water permeability and salts rejection.

Research paper thumbnail of Columnar liquid-crystalline triazine-based dendrimer with carbon nanotube filler for efficient organic lithium-ion batteries

Electrochimica Acta, Dec 1, 2022

Research paper thumbnail of Redox-active polynaphthalimides as versatile electrode materials for high-voltage, high-rate and long-cycle-life organic Li-ion batteries

Journal of materials chemistry. A, Materials for energy and sustainability, 2023

Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, a... more Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, anode, and binders in lithium-ion batteries simultaneously.

Research paper thumbnail of Co- and Ni-Based Electroactive Metal–Organic Frameworks for Stable Lithium Storage: Electrochemical and Charge-Storage Behavior in Response to Different Metal Centers

Crystal Growth & Design

Research paper thumbnail of Dicyanotriphenylamine-Based Polyimides as High-Performance Electrodes for Next Generation Organic Lithium-Ion Batteries

Aromatic polyimide (PI) derivatives have recently been investigated as redox-active electrode mat... more Aromatic polyimide (PI) derivatives have recently been investigated as redox-active electrode materials for Li-ion batteries because of their high thermal stability and thermo-oxidative stability complemented by excellent solvent resistance, good electrical and mechanical properties, and chemical resistance. In this work, we report two PI derivatives from a newly synthesized 4,4'-diamino-3″,4″-dicyanotriphenylamine (DiCN-TPA) monomer and two dianhydrides, pyromellitic dianhydride (PMDA) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA); designated as TPA-PMPI and TPA-NTCPI, respectively, as electrode materials for Li-ion batteries. Characterizations of the PIs reveal excellent thermal stability and bipolar property. The incorporation of DiCN-TPA into the polymer structure resulted to a disordered chain arrangement, thus giving high glass transition temperatures (Tg). Electrochemical performance tests reveal that TPA-NTCPI cathode delivered a reversible specific capacity of 150 mAh g-1 at 0.1 A g-1 and exhibited a stability up to 1000 cycles. On the other hand, TPA-PMPI anode delivered a high specific capacity of up to 1600 mAh g-1 at 0.1 A g-1 after 100 cycles. The electrochemical performance of TPA-NTCPI cathode and TPA-PMPI anode are both among the best compared with other reported aromatic PI-based electrodes. The long cycle lifetime and excellent battery performance further suggest that TPA-NTCPI and TPA-PMPI are promising organic electrode materials for next generation Li-ion batteries.

Research paper thumbnail of An Efficient and Reversible Battery Anode Electrode Derived from a Lead-Based MetalOrganic Framework

Research paper thumbnail of Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

Nanomaterials, 2020

This study investigates the permeance and rejection efficiencies of different dyes (Rhodamine B a... more This study investigates the permeance and rejection efficiencies of different dyes (Rhodamine B and methyl orange), folic acid and a protein (bovine serum albumin) using graphene oxide composite membrane. The ultrathin separation layer of graphene oxide (thickness of 380 nm) was successfully deposited onto porous polyvinylidene fluoride-polyacrylic acid intermediate layer on nonwoven support layer using vacuum filtration. The graphene oxide addition in the composite membrane caused an increased hydrophilicity and negative surface charge than those of the membrane without graphene oxide. In the filtration process using a graphene oxide composite membrane, the permeance values of pure water, dyes, folic acid and bovine serum albumin molecules were more severely decreased (by two orders of magnitude) than those of the nonwoven/polyvinylidene fluoride-polyacrylic acid composite membrane. However, the rejection efficiency of the graphene oxide composite was significantly improved in cati...

Research paper thumbnail of Facile Synthesis of Carboxylated Activated Carbon Using Green Approach for Water Treatment

IOP Conference Series: Materials Science and Engineering, 2019

A chemical treatment by using oxidizing agents is the most common methodology to modify or create... more A chemical treatment by using oxidizing agents is the most common methodology to modify or create functional groups on activated carbon. The modified activated carbon obtained from chemical oxidation needs further treatment and produced waste, therefore a new approach is needed. A facile green approach is reported. In this approach the activated carbon was oxidized using air without additional chemical treatment to increase the content of acidic surface functional groups, especially carboxyl groups. The formation of carboxyl groups was confirmed by Temperature Programmed Decomposition, Boehm titration, and Infra-red spectroscopy results. The Boehm titration result showed higher contents of carboxyl groups by three-fold. The carboxylated activated carbon synthesized by green approach showed excellent performance for water treatment.

Research paper thumbnail of Upaya Peningkatan Aktivitas Dan Prestasi Belajar Dengan Model Pembelajaran NHT (Numbered Head Together) Dilengkapi LKS Pada Materi Termokimia Siswa Kelas XI IPA-3 Sma Negeri 6 Surakarta

Jurnal Pendidikan Kimia, Apr 3, 2013

Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi ... more Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan aktivitas belajar siswa kelas XI IPA-3 pada materi Termokimia. 2) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan prestasi belajar siswa kelas XI IPA-3 pada materi Termokimia. Metode penelitian yang dilaksanakan adalah penelitian tindakan kelas yang terdiri dari dua siklus. Populasi dalam penelitian ini adalah siswa kelas XI IPA SMA Negeri 6 Surakarta tahun ajaran 2012/ 2013. Data penelitian yang diambil berupa prestasi belajar kognitif, afektif, aktivitas belajar siswa serta kepuasan belajar siswa sebagai gambaran tanggapan siswa terhadap pembelajaran yang berlangsung. Pengumpulan data dilakukan melalui observasi, tes prestasi kognitif, angket, wawancara, dan dokumentasi. Teknik analisis data yang digunakan adalah analisis deskriptif kualitatif. Hasil penelitian dan analisis yang telah dilakukan menunjukkan: 1) Model pembelajaran NHT (Numbered Head Together) dilengkapi LKS dapat meningkatkan aktivitas belajar siswa pada materi Termokimia. 2) Model pembelajaran NHT (Numbered Head Together) dilengkapi LKS dapat meningkatkan prestasi belajar materi Termokimia.

Research paper thumbnail of Redox-active polynaphthalimides as versatile electrode materials for high-voltage, high-rate and long-cycle-life organic Li-ion batteries

Journal of Materials Chemistry A

Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, a... more Triphenylamine-based polynaphthalimides were synthesized and showed great potential as cathode, anode, and binders in lithium-ion batteries simultaneously.

Research paper thumbnail of High-Performance Aramid Electrodes for High-Rate and Long Cycle-Life Organic Li-ion Battery

Journal of Materials Chemistry A

Aromatic polyamides, aramids, have recently drawn reasech attentions for energy storage applicati... more Aromatic polyamides, aramids, have recently drawn reasech attentions for energy storage applications due to their outstanding physical and chemical properties. In this work, we report three new aramids containing dicyanotriphenylamine...

Research paper thumbnail of Columnar Liquid-Crystalline Triazine-Based Dendrimer with Carbon Nanotube Filler for Efficient Organic Lithium-Ion Batteries

Research paper thumbnail of (Invited) Inorganic/Organic Hybride Perovskites for Energy-Related Applications

ECS Meeting Abstracts, 2021

State-of-the-art energy storage devices work by insertion/extraction of the alkali metal ions int... more State-of-the-art energy storage devices work by insertion/extraction of the alkali metal ions into a porous electrode material, where the overall capacity is strongly dependent on the accessibility of the host material interior to the ions. On the other hand, the performance stability depends on various factors governed by the specific constitution of the electrode. Here we show that molecularly engineered hybrid perovskites can be utilized in Lithium-ion batteries as anode materials with good performance. More hybrid perovskites can be targets for further optimization considering the structural diversity. We anticipate that these results open a new direction for the use of hybrid perovskites for energy storage applications.

Research paper thumbnail of Dual‐Ligand Zn‐Based Metal–Organic Framework as Reversible and Stable Anode Material for Next Generation Lithium‐Ion Batteries

Research paper thumbnail of Strategic Structural Design of a Gel Polymer Electrolyte toward a High Efficiency Lithium-Ion Battery

ACS Applied Energy Materials, 2019

Electrolytes have played critical roles in electrochemical energy storage. In Liion battery, liqu... more Electrolytes have played critical roles in electrochemical energy storage. In Liion battery, liquid electrolytes have shown their excellent performances for over decades, such as high ionic conductivity (~10 −3 S cm −1) and good contacts with electrodes. However, the use of liquid electrolytes often brought risks associated with leakage and combustion of organic electrolytes. Hence, polymer electrolytes become potential candidates to replace liquid electrolyte systems. Although solid polymer electrolytes (SPEs) offer better safety and good mechanical properties to take over liquid electrolytes, most of them only deliver low ionic conductivities (~10 −8 S cm −1) and poor contact with electrodes, results in poor cycle performance and low electrical capacity of the batteries. In addition, gel polymer electrolytes (GPEs) have received increasing research attention due to their relevant characteristics, which extend from liquid electrolytes and solid polymer electrolytes. In this review, state-ofthe-art of gel polymer electrolytes are elucidated with respect to their structural design and

Research paper thumbnail of Graphene oxide-cation interaction: Inter-layer spacing and zeta potential changes in response to various salt solutions

Journal of Membrane Science, 2018

The objective of this study is to investigate the interaction between graphene oxide (GO) laminat... more The objective of this study is to investigate the interaction between graphene oxide (GO) laminate and salt solutions. The well-aligned GO laminate is distributed on the top surface of a polyvinylidene fluoride-polyacrylic acid (PVDF-PAA) microporous layer via vacuum filtration. The PVDF-PAA layer was formed after being cast on a non-woven support and immersed in a water coagulation bath. We illustrate herein how the inter-layer spacing of the GO laminate membrane is varied due to contact with salt solutions or water, which results in tunable ionic sieving effect. The GO inter-layer spacing is calculated, and this spacing shrunk to 2.8 nm in the presence of MgSO 4 and enlarged to 6.1 nm with Na 2 SO 4 from the initial 4.8 nm of water-swollen GO. The permeance values of the filtrate from Na-solutions are unexpectedly higher than those of pure water. It is assumed that the water permeation through the GO composite membrane follows a modified Hagen-Poiseuille's law. The strong GO-Mg 2+ interaction causes the surface zeta potential toward a neutral charge, which results in low rejections (<12%) for MgSO 4 and MgCl 2 solutions. The intermediate GO-Na + interaction maintains the negative zeta potential of the GO layer, which readily rejects Na 2 SO 4 (79%). The cations can modulate surface zeta potential and inter-layer spacing, which in turn directly impact the anion permeation and salt rejection behaviors. Overall, GO-salt interaction plays an important role in tailoring GO membrane characteristics. These GO-cation behaviors have potential applications in water filtration, desalination, molecular separation, and ion sensing and detection.

Research paper thumbnail of Upaya Peningkatan Aktivitas Dan Prestasi Belajar Dengan Model Pembelajaran NHT (Numbered Head Together) Dilengkapi LKS Pada Materi Termokimia Siswa Kelas XI IPA-3 Sma Negeri 6 Surakarta

Jurnal Pendidikan Kimia, Apr 3, 2013

Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi ... more Penelitian ini bertujuan untuk mengetahui apakah: 1) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan aktivitas belajar siswa kelas XI IPA-3 pada materi Termokimia. 2) Penerapan model pembelajaran NHT dilengkapi LKS dapat meningkatkan prestasi belajar siswa kelas XI IPA-3 pada materi Termokimia. Metode penelitian yang dilaksanakan adalah penelitian tindakan kelas yang terdiri dari dua siklus. Populasi dalam penelitian ini adalah siswa kelas XI IPA SMA Negeri 6 Surakarta tahun ajaran 2012/ 2013. Data penelitian yang diambil berupa prestasi belajar kognitif, afektif, aktivitas belajar siswa serta kepuasan belajar siswa sebagai gambaran tanggapan siswa terhadap pembelajaran yang berlangsung. Pengumpulan data dilakukan melalui observasi, tes prestasi kognitif, angket, wawancara, dan dokumentasi. Teknik analisis data yang digunakan adalah analisis deskriptif kualitatif. Hasil penelitian dan analisis yang telah dilakukan menunjukkan: 1) Model pembelajaran NHT (Numbered Head Together) dilengkapi LKS dapat meningkatkan aktivitas belajar siswa pada materi Termokimia. 2) Model pembelajaran NHT (Numbered Head Together ) dilengkapi LKS dapat meningkatkan prestasi belajar materi Termokimia.

Research paper thumbnail of Graphene Oxide Nanosheet Framework on the Surface of Polyvinylidene Fluoride-co-Polyacrylic Acid Composite Membrane for Water Purification

In this work, graphene oxide was synthesized by modified Hummer’s method. Thin layer graphene oxi... more In this work, graphene oxide was synthesized by modified Hummer’s method. Thin layer graphene oxide nano-sheets framework was deposited on the top surface of porous polyvinylidene fluoride-co-polyacrylic acid (PVDF-PAA) composites membrane through vacuum filtration. The resulting membrane was investigated on nanofiltration (NF) system to evaluate its performance of water permeability and salts rejection.