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All Journal Bulletin of Chemical Reaction Engineering & Catalysis The Journal of Pure and Applied Chemistry Research IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Science and Technology Indonesia Indonesian Journal of Chemistry Communications in Science and Technology Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Jurnal Kreativitas PKM Molekul: Jurnal Ilmiah Kimia JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) International Journal of Sustainable Transportation Technology Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Journal of Chemical Science
Addy Rachmat
Department Of Chemistry, Faculty Of Mathematics And Natural Science, Sriwijaya University
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation

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Processing of Tofu industrial wastewater by electrocoagulation method using aluminum (Al) electrode at various electrical current and contact time Rachmat, Addy; Fatma, Fatma; Pratama, Nisa Manora; Musifa, Eva
Indonesian Journal of Chemical Science Vol. 14 No. 1 (2025): Indonesian Journal of Chemical Science
Publisher : Prodi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v14i1.18787

Abstract

This research aims to determine the effect of varying voltage and contact time on reducing levels on Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and ammonia as well as increasing pH values ​​in tofu industrial wastewater by electrocoagulation using Aluminum electrodes. There were 4 variations of voltage (10,20,30,4 0A) and 5 variations of contact time (30,60,90,120,150 minutes). Analysis of COD levels and ammonia levels was carried out using a UV-Vis spectrophotometer, analysis of TSS levels gravimetrically using Whatman filter paper No. 42, analysis of TDS levels with gravimetrically, and analysis of pH values ​​by a pH meter. The best results were obtained from treatment at voltage of 40 A and a contact time of 150 minutes with the highest efficiency of reducing COD, TSS, TDS, ammonia levels respectively at 90.35; 92; 66; 85% and the highest increase in pH value was 108%. The results of the diversity analysis or Tukey's advanced test showed that at the 5% level each treatment had a significant effect on reducing COD, TSS, TDS and ammonia levels as well as increasing the pH value. Chemical kinetics analysis of the reduction in COD and TSS levels showed results that were close to first orde linear and obtained R2 and k values ​​respectively of (0.9904; 0.0164); (0.9952; 0.0182) at voltage variation of 40 A
Effect of Hydrogen Flow Rate on MEA Performance with a Three-Catalyst-Layer Pt/C Configuration Yulianti, Dwi Hawa; Rohendi, Dedi; Budiman, Rahmadi; Firanda, Dera Okta; Rachmat, Addy; Sya'baniah, Nyimas Febrika
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.146

Abstract

An essential component in Proton Exchange Membrane Fuel Cells (PEMFCs) is the Membrane Electrode Assembly (MEA), which facilitates the electrochemical reaction between hydrogen and oxygen to generate electrical energy. This study examines the effect of varying hydrogen gas flow rates on the performance and durability of a Pt/C-based MEA. The MEA used in this research measures 6.5 cm × 30 cm with a catalyst loading of 2 mg/cm². The electrode is constructed in three layers of catalysts to maximize interfacial contact within the catalyst layer. The tested hydrogen flow rates were 100, 200, 300, and 400 mL/min. Performance evaluation was conducted through polarization (I–V) and power (I–P) curve measurements. The results indicated optimal performance at a 200 mL/min flow rate, with a maximum power density of 3.563 mW/cm² and a current density of 10.256 mA/cm². Durability testing was carried out under a constant current of 2 A for 12 hours and showed a voltage drop of 24.35% after 10 hours of operation. Electrochemical characterization using Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), and Linear Sweep Voltammetry (LSV) yielded an Electrochemical Surface Area (ECSA) of 1.477 × 10⁻⁵ m²/g, electrical conductivity of 3.218 × 10⁻⁴ S/cm, and an electric charge of 4.2 × 10⁻⁶ C.
Biosourced Reduced Graphene Oxide and Its Application for Methylene Blue Adsorption Rachmat, Addy; Ahadito, Bijak Riyandi; Suryani, Sri; Meiliza, Cici; Hidayati, Nurlisa; Julinar, Julinar; Said, Muhammad
The Journal of Pure and Applied Chemistry Research Vol. 14 No. 3 (2025): Edition September-December 2025
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2025.014.03.7926

Abstract

Graphene oxide and reduced graphene oxide have been widely studied as a biomass-sourced alternative to graphene for their various capabilities, e.g. as adsorbent. This publication reports the preparation of graphite (g), graphene oxide (GO), and reduced graphene oxide (rGO) from coconut shell (1) and sugarcane bagasse (2) using matoa leaves extract as reducing agent, characterized by XRD, FT-IR, and Raman spectroscopy. The X-ray diffractogram showed 2θ peaks between 22.8°–23.8° for g1, GO1, and rGO1, and between 23.6°–25.8° for g2, GO2, and rGO2. FT-IR spectra of both sets of GO and rGO showed common peaks of O–H (~3400 cm–1), C–H (~2900 cm–1), and C–OH (~1600 cm–1), while also some noticeable differences between the sets. Raman spectra of both rGO showed D peak (~1400 cm–1), G peak (~1700 cm–1), and weak 2D peaks (2700–3300 cm–1) with ID/IG of 0.93 and 0.91 for rGO1 and rGO2, respectively. The obtained g, GO, and rGO were used as adsorbent for methylene blue dye. The adsorption study involved variation in dye concentration, contact time, and amount of adsorbent. It was found that rGO performs best as adsorbent compared to GO and g, with maximum adsorption capacity of 22.308 μg/mg (rGO1) and 47.533 μg/mg (rGO2). Adsorbents prepared from sugarcane bagasse were found to perform better due to its easiness of carbonization compared to coconut shell.
Synthesis and Characterization Composite Fe3O4/Chitosan-PVA/TiO2 for Photocatalytic Degradation of Tetracycline Denada, Laellia; Poedji Loekitowati Hariani; Addy Rachmat
The Journal of Pure and Applied Chemistry Research Vol. 14 No. 3 (2025): Edition September-December 2025
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2025.014.03.7945

Abstract

This research aims to synthesize tetracycline waste which pollutes the environment, can be overcome by a photocatalytic degradation process using a Fe3O4/Chitosan-PVA/TiO2 composite synthesized using the coprecipitation method. The Fe3O4/Chitosan-PVA/TiO2 composite was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope- Energy Dispersive Spectroscopy (SEM-EDS), Vibrating Sample Magnetometer (VSM), Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS) and pHpzc. The crystallite size of 28.29 nm. The morphology of the composite shows a heterogeneous form with the constituent elements being C (7.69%), N (12.78), O (14.88%), Fe (63.33%) and Ti (1.29%). The saturation magnetization value of 64.24 emu/g is superparamagnetic with a band gap value of 1.38 eV and pHpzc at pH 6.8. The degradation process was studied by investigating the influence of several parameters, namely, solution pH, tetracycline concentration and irradiation time. The efficiency of tetracycline degradation by Fe3O4/Chitosan-PVA/TiO2 was 94.85% at pH 2, concentration of 15 mg/L and radiation time of 70 minutes. The results of Total Organic Carbon (TOC) analysis in a 15 mg/L tetracycline solution before degradation were 20.3 mg/L and after degradation were 5.59 mg/L with a percent reduction in carbon content of 72.46%.
Co-Authors A.M. Ramadhan Adelia, Ory Adhiyanti, Nurmalina Ahmad Fatoni Aldes Lesbani Aldi Herbanu Amelia, Icha Anisa Fitri Amatullah Bakri Rio Rahayu Bijak Riyandi Ahadito Budiman, Rahmadi Dasril Basir Dea Radestia Rahmah Dedi Rohendi Denada, Laellia Desnelli Desnelli Dwi Hawa Yulianti Dwi Hawa Yulianti Edy Herianto Majlan, Edy Herianto Elfita Elfita Eliza Eliza Eliza Eliza Fahma Riyanti Fanani, Muhammad Zainal Fatma Fatma Fatma Fatmawati Fatmawati Ferlinahayati Ferlinahayati Firanda, Dera Okta Handayani Citra Pratiwi Hardi Aji Badarwi Hasanuddin Hasanuddin Hasanudin hasanudin Hasanudin Hasanudin Hasanudin Hasanudin Hasanudin, Hasanudin Hermansyah Hermansyah Hermansyah Julinar Julinar Julinar Julinar Meiliza, Cici Muhammad Said Muhammad Said Muhammad Said Muhammad Said Muhammad Said MUHAMMAD SAID Musifa, Eva Nabila Aprianti Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif, Nirwan Normah Normah, Normah Nurlisa Hidayati Nurlisa Hidayati Nurmalina Adhiyanti Poedji Loekitowati Hariani Poedji Loekitowati Hariani Pratama, Nisa Manora Rahmah, Dea Risfidian Mohadi Risfidian Mohadi Rizki, Widya Twiny Salni Salni Salni Salni Sri Suryani Sya'baniah, Nyimas Syabaniah, Nyimas Febrika Syahputra, Rio Aldo Syarif, Nirwan Sya’baniah, Nyimas Febrika Tarmizi Taher Utama, Muhammad Prima Widia Purwaningrum Yulianti, Dwi Yulianti, Dwi Hawa