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All Journal ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Communications in Science and Technology Molekul: Jurnal Ilmiah Kimia
Edi Pramono
Program Studi Kimia, Fakultas MIPA, Universitas Sebelas Maret Surakarta
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology

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The Effect of Chloro Acetic Acid Concentration and Temperature Reaction of Carboxymethyl Chitosan Formation on Cation Exchange Capacity and Thermal Stability Purnawan, Candra; Pramono, Edi; Purwanto, Purwanto
ALCHEMY Jurnal Penelitian Kimia Vol 10, No 1 (2014): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.10.1.7.31-39

Abstract

The research on the effect of chloro acetic concentration and temperature reaction of carboxymethyl chitosan formation on cation exchange capacity and thermal stability of polymer have been done. Carboxymethyl chitosan was synthesized by reaction of chitosan and chloro acetic acid with NaOH as catalyst. Polymer was characterized by Fourier Transform Infrared Spectrofotometer, cation exchange capacity test, and thermal analysis with thermogravimetric method. Carboxymethyl chitosan has strong FTIR adsorption of carboxyl group (-COO-) in 1606,70 cm-1 and 1444,68 cm-1. The increasing of chloro acetic acid concentration and reaction temperature decreased cation exchage capacity and changed thermal stability of polymer.
Composite of Chitosan Vanilin / Sulfonated Polystyrene As Polymer Electrolyte Membranes: Cationic Exchange Capacity, Swelling Degree And Thermal Properties Edi Pramono; Candra Purnawan; Yuniawan Hidayat; Jati Wulansari; Sayekti Wahyuningsih
ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.10.2.55.116-129

Abstract

Research on the preparation and characterization of sulfonated polystyrene (PST) /chitosan vanillin (KV) composite as electrolyte membranes has been conducted in order to investigate the effect of PST and KV composition  to its chemical and physical properties. Polystyrene was modified by sulfonation reaction to produces PST, meanwhile chitosan was modified by schift base reaction to produces KV. The composite membranes were prepared by casting method and were characterized in order to identify the functional groups contained in the composite, the cation exchange capacity (CEC), the Swelling Degree (SD), the thermal properties and the morphology. The peak of imine vibration in the FTIR spectrum indicates that the chitosan vanilin was succesfully synthesized. Meanwhile, the peak of sulfonate vibration indicates the product of sulfonation on polystyrene. The result of CEC analysis shows that the addition of sulfonate groups on polystyrene and the addition of phenolic groups on chitosan increase the CEC value. The increasing of PST and KV concentration in membrane enhance the CEC value. However, the increasing of PST concentration in membrane composition even decrease the Swelling Degree of membranes. Meanwhile, the increasing of KV concentration increase the swelling degree of membranes. Thermal analysis shows that the thermal decomposition of membranes occurs in three stages i.e. the dehydration of water molecules, the degradation of the subtituen groups and the plasticizer and the degradation of the back bone of chitosan and polystyrene.
Polyvinylidene Fluoride (PVDF)/Modified Clay Hybrid Membrane for Humic Acid and Methylene Blue Filtration Edi Pramono; Gadis Prihatin Wahyu Sejati; Sayekti Wahyuningsih; Candra Purnawan
Indonesian Journal of Chemistry Vol 23, No 2 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.78979

Abstract

This research studied the impact of silanized clay modification on performance and antifouling Poly(vinylidene fluoride) (PVDF) membrane toward humic acid and methylene blue filtration. Clay modification was carried out by using 3-aminopropyltriethoxysilane (APS) to produce modified clay (Clay-APS). Hybrid membranes were prepared by phase inversion for humic acid and methylene blue filtration. Hybrid membranes were characterized by measuring surface hydrophilicity, water flux, rejection, and antifouling properties. Clay and Clay-APS modification increased hybrid membrane surface hydrophilicity, as indicated by increasing the β fraction and decreasing the water contact angle. The PVDF/Clay and PVDF/Clay-APS hybrid membranes showed high permeability and selectivity with the highest water flux values of 24.2 L m−2 h−1. The rejections for humic acid and methylene blue were 98.8 and 99.3%, respectively. The highest antifouling property was obtained from the PVDF/Clay-APS hybrid membrane, with a flux recovery ratio was 96.0%. The PVDF/Clay hybrid membrane performance and antifouling properties showed that the membranes have the potential for water treatment.
Utilization of Lignin and Lignosulfonate from Oil Palm Empty Fruit Bunches as Filler in PVDF Proton Exchange Membrane Fuel Cell Nala Ridhwanul Mu'izzah; Pinka Zuhdiana Hapsari; Nabila Putri Aulia; Dian Wahyu Tri Wulansari; Fauziyah Azhari; Edi Pramono
Indonesian Journal of Chemistry Vol 23, No 4 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.81750

Abstract

A study on the polyvinylidene fluoride (PVDF) membrane using lignin and lignosulfonate oil palm empty fruit bunch (OPEFB) fillers have been carried out. This study aims to determine the additional effect of lignin and lignosulfonate on PVDF membrane. Lignin sulfonation has a good result proven by Fourier transform infrared spectra with a peak at 1192 cm−1 which indicates sulfonate group. The sulfonation degree was increased by 8.9% for lignosulfonate. The membrane was prepared by the phase inversion method. Data present that all the membranes have an asymmetric structure with finger-like and sponge-like pores. Good thermal stability indicated by thermal gravimetric analysis showed degradation at 432 °C. The mechanical properties of the membrane decrease with the addition of filler. From the X-ray diffraction, peaks appeared at 18.39°, 21.35°, and 23.75° for all the membranes indicating of α and β phases. Lignin and lignosulfonate increased membrane hydrophilicity and water uptake. The presence of the sulfonate group increases the ionic exchange capacity and ionic conductivity up to 2.78 mmol/g and 9.95 × 10−5 S/cm, respectively, for 5% lignosulfonate addition. Thus, PVDF/lignosulfonate has the potential as a polymer electrolyte membrane.
Synthesis of Cellulose Acetate from Screw Pine (Pandanus tectorius) Leaves for Enhancing Water Permeability and Fouling Resistance of PVDF Membrane Elyna Wahyu Trisnawati; Venty Suryanti; Edi Pramono; Indri Sri Cahyani; Diah Safriyani
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.85726

Abstract

Cellulose derivatives from natural resources continuously develop to find the best hydrophobic polymer-based membrane technology performance. This study was conducted to improve the hydrophilicity, performance, and anti-fouling of polyvinylidene fluoride (PVDF) membrane with cellulose acetate (CA) filler synthesized from screw pine (Pandanus tectorius) leaf cellulose. CA was synthesized by the Fischer esterification mechanism and the PVDF membrane was fabricated using the phase inversion method with 0.3% CA concentration. FTIR analysis of CA shows an absorption at 1700 cm−1 suggesting that the hydroxyl group of cellulose had been successfully substituted with an ester group (C=O), and CA has a high degree of substitution (DS) value of 3.50. Adding CA improved the hydrophilicity and anti-fouling properties of up to 86.45% of PVDF membranes. Furthermore, CA increased the value of water permeability 2–3 times than pristine PVDF membrane. The presence of CA enhanced the porosity of the PVDF membrane, which promoted the membrane's effectiveness for MB filtering. As a result, CA from screw pine leaf cellulose has promising features as a filler for PVDF membranes and potential dye filtration.
Kinetics Study on Thermal Degradation of Polystyrene and Sulfonated Polystyrene from Styrofoam Waste Pramono, Edi; Dewi, Chintya; Rahmawati, Fitria
Molekul Vol 18 No 3 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.3.7306

Abstract

This research studied kinetics of thermal degradation of polystyrene (PS), and sulfonated polustyrene (sPS) which were synthesized from styrofoam waste. The thermal study was conducted by thermogravimetric analysis (TGA) at various heating rate of 10, 15, 20 and 25 dpm. The kinetics parameters were determined by Coats Redfern (CR), Friedman (FM), Kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) models. TGA result found that PS has range thermal stability of 274 – 415 oC, but sPS has range thermal stability of 175 – 582 oC. Kinetic study to PS shows that the activation energy increases by the increasing of fraction conversion for all kinetics parameters with a regression value close to 1. While in sPS, the CR method shows an increase in activation energy value with an increasing fraction convertion. On the other hand, CR-FM-KAS and OFM methods obtained an increase in activation energy, then decreased at the fraction convertion above 0.6, and received negative activation energy. The kinetics model successfully explains the degradation of PS and sPS. In addition, the high thermal stability of sPS from styrofoam waste shows that this material has good potential as polymer electrolyte materials.
Silylated-montmorillonite as co-adsorbent of chitosan composites for methylene blue dye removal in aqueous solution Saputra, Ozi Adi; Kurnia; Pujiasih, Septi; Rizki, Vanani Nur; Nurhayati, Betty; Pramono, Edi; Purnawan, Candra
Communications in Science and Technology Vol 5 No 1 (2020)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1045.12 KB) | DOI: 10.21924/cst.5.1.2020.182

Abstract

Industrialization plays important role in the economy of developing countries, including increasing community welfare. However, the presence of poorly industries waste disposal system has negative impact to the environment. Therefore, it is necessary to overcome this problem with low-cost technology, called adsorption. In this research, silylated-montmorillonite (sMMt) has been successfully prepared as supporting material for adsorption of methylene blue by chitosan. The sMMt was characterized by FTIR, XRD, and elemental mapping techniques. The chitosan/sMMt composites were prepared through dissolution-precipitation method and produced rod-like morphology as observed by SEM. The adsorption process was carried out in a batch method by studying the pH and the adsorption contact time. The adsorption kinetic mechanism of the chitosan/sMMt nanocomposite followed pseudo-second order rather than Lagergren model indicating chemisorption predominant. The addition of silylated-montmorillonite into chitosan enhanced the methylene blue dye removal performance, which evidenced by improving Qe values by 10% compared to chitosan.
Optimizing of TiO2 Separation from Bangka Ilmenite by Leaching Process Using HCl Sayekti Wahyuningsih; Hari Hidayatullah; Edi Pramono
ALCHEMY Jurnal Penelitian Kimia Vol 10, No 1 (2014): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.10.1.16.54-68

Abstract

Separation of titanium dioxide (TiO2) from ilmenite Bangka has been done byleaching processusing HCl. Before the leaching process, ilmenite was roastedat 900oC for pre-oxidation (preliminary - oxidation). Leaching process carried out by variation of HCl concentration and Fe0 reducing agents. While the re-deposition of dissolved Ti4+ ion achieved by hydrolysis - condensation using 2-propanol-H2O solvents. Leaching the pre-oxidazed ilmenite shows the phase change of  pseudobrokite (Fe2TiO5) into hematite (Fe2O3) and synthetic rutile (TiO2). Formation of the synthetic rutile was characterized by the loss of intensity of Fe2TiO5 at 26.65º and the increasing intensity of rutile TiO2 at 27.49º.The dissolution rate of both titanium and iron was found to be increased, generally, by increasing acid concentration in case of HCl as well as by increasing ilmenite: Fe0 ratio. Precipitation of the dissolved titania with 2-propanol -H2Oof 8:2(v /v) produced anatase TiO2 due to the hydrolysis and condensation of Ti-tetra isopropoxide complexes.
Co-Authors Agung Lucky Pradita Aldita Fatchul Ni’mah Candra Purnawan Candra Purnawan Candra Purnawan Chintya Dewi, Chintya Desy Vita Pratiwi Diah Safriyani Dian Wahyu Tri Wulansari Dina Syakirina Elyna Wahyu Trisnawati Fauziyah Azhari Fitria Rahmawati Gadis Prihatin Wahyu Sejati Hari Hidayatullah Indri Sri Cahyani Jati Wulansari Jati Wulansari, Jati Kurnia Mayzy Vanesia Insani Nabila Putri Aulia Nala Ridhwanul Mu'izzah Nurhayati, Betty Ozi Adi Saputra Ozi Adi Saputra, Ozi Adi Pandu Satrio Asiska Prabowo, Pandu Satrio Pinka Zuhdiana Hapsari Pujiasih, Septi Purwanto Purwanto Reza Zatadini Rizki, Vanani Nur Sayekti Wahyuningsih Sayekti Wahyuningsih Thita Haryati, Thita Tri Martini Venty Suryanti Widyan Muhammad Naufal Wulida Rayhani Yudi Setiawan Yuniawan Hidayat