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All Journal 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) Jurnal Abdi Insani 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 Sciences, Universitas Sriwijaya, Indralaya, Ogan Ilir, South Sumatera, 30662, Indonesia
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PEMBERDAYAAN MASYARAKAT MELALUI PELATIHAN PRODUKSI TEMPE SEHAT DI DESA TEBEDAK 2, KABUPATEN OGAN ILIR, SUMATERA SELATAN Tiara Ramadaini; Hermansyah; Susilawati; Laela Mukaromah; Addy Rachmat
Jurnal Abdi Insani Vol 13 No 2 (2026): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v13i2.3644

Abstract

Desa Tebedak 2 kecamatan Payaraman Kabupaten Ogan Ilir  Sumatera Selatan memiliki potensi pengembangan pangan berbasis kedelai, namun pengetahuan masyarakat mengenai gizi serta keterampilan teknis produksi tempe masih terbatas, sehingga desa belum memiliki produsen tempe lokal. Kondisi ini berimplikasi pada rendahnya pemanfaatan tempe sebagai sumber protein nabati dan hilangnya peluang usaha berbasis pangan fermentasi. Kegiatan pengabdian ini bertujuan meningkatkan pemahaman masyarakat mengenai nilai gizi tempe serta melatih keterampilan teknis pembuatan tempe sehat sebagai langkah menuju kemandirian pangan dan pengembangan UMKM desa. Metode pelaksanaan meliputi penyuluhan, demonstrasi proses produksi tempe menggunakan Rhizopus oligosporus, serta praktik mandiri yang diikuti evaluasi melalui pre–test, post–test, dan kuesioner kepuasan. Hasil menunjukkan peningkatan pengetahuan sebesar 33,68% dan penilaian sangat baik dari mayoritas responden (39 dari 43 responden menyatakan materi “baik sekali”). Produk tempe hasil praktik menunjukkan warna putih merata, tekstur padat, dan aroma khas fermentasi, menandakan keberhasilan transfer keterampilan. Peserta menilai kegiatan relevan, aplikatif, dan bermanfaat untuk membuka peluang usaha baru. Dukungan perangkat desa menguatkan rencana pembentukan kelompok usaha “Tempe Sehat Tebedak”. Secara keseluruhan, kegiatan ini berhasil meningkatkan kapasitas pengetahuan dan keterampilan masyarakat serta memberikan dasar bagi pengembangan ekonomi berbasis pangan lokal.
Modification of CaO from Scallops (Amusium Pleuronectes) with Fe3O4 and SiO2 for Adsorption of Congo Red and Methylene Blue Dye Fera Rahma Sari; Widia Purwaningrum; Addy Rachmat
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 11, No 1 (2026): February 2026
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v11.i1.26

Abstract

Congo Red and Methylene Blue dye waste from the textile industry needs to be treated before being discharged into water bodies. Adsorption is widely recognized as an effective method of contaminant removal. The use of CaO as an adsorbent has the advantages of high kinetic speed, efficient, low cost, easily accessible, and abundant. To improve the performance of CaO, it is done by compositing CaO with Fe3O4 and SiO2. This study aims to synthesize a CaO/Fe3O4/SiO2 and apply it for the adsorption of Congo red and Methylene blue dyes. The synthesis of CaO/Fe3O4 uses the coprecipitation method and CaO/Fe3O4/SiO2 is synthesized using the Stober method by adding TEOS to CaO/Fe3O4. The results of XRD characterization show that the synthesized CaO, CaO/Fe3O4, and CaO/Fe3O4/SiO2 have the same 2θ angle as the reference diffractogram data. The addition of SiO2 was shown to prevent agglomeration, which was indicated by a decrease in the particle size of CaO/Fe3O4 from 70.07 to 52.42 nm in CaO/Fe3O4/SiO2. % Adsorption efficiency for Congo Red was 86.49% Methylene Blue was 99.12%. The adsorption process of both dyes was spontaneous, following a pseudo-second-order kinetic model. Congo Red adsorption followed the Freundlich isotherm model, while Methylene Blue followed the Langmuir isotherm model.Keywords: CaO/Fe3O4/SiO2, adsorption, Congo red, Methylene blue
Preparation of Palm Kernel Shell Binchotan for Radio Frequency Energy Harvesting Nyimas Febrika Sya'baniah; Nirwan Syarif; Dedi Rohendi; Addy Rachmat; Rio Aldo Syahputra
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

Research on the development of radio frequency energy harvesting slabs from palm kernel shells binchotan has been done. The slabs were characterized by using XRD and FTIR intrumentations to determine their crystallography and functional groups. The electrical response of slabs was measured on impedance spectroscopy instrumentation. The conductivity, impedance, and dielectric constant were calculated from impedance spectroscopy data. Diffractograms showed crystalline carbon and confirmed with the existence of peaks, at 2θ, 24.5° and 44.56°. FTIR analysis showed that carbon palm shells have the absorption length is in the range of wave numbers 1100 – 1200 cm-1 for CO of carboxylic acid, aldehyde, ketone and ester, from 1475 to 1600 cm-1 for C=C aromatic ring and double peaks in 1900 – 2100 cm-1 for conjugated C-C. The slabs conductivity varies from 1 to 7 mScm-1. Impedance values for the slabs vary from 1.5 to 2.4 ohm. Dielectric constants for the slabs range from 0.42 to 140.
Utilization of Antioxidant Fagraea fragrans fruit as Phytocosmetics Dasril Basir; Addy Rachmat; Julinar Julinar; Eliza Eliza
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 9, No 1 (2024): February 2024
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v9.i1.41

Abstract

The objective is to test the antioxidant activity of methanol (MeOH) extracts,  ethyl acetate (EtOAc) fractions, and an isolated compound of F. fragrans (tembesu) fruitby using DPPH method respectively. Antioxidant is one of the main components of phytocosmetic beside anti-inflammatory, anticancer, and antimicrobial activities while phytocosmetics of F. fragrans fruit is the cosmetics that mainly use extracts or components derived from this fruit only, without preservatives, such as products that do not contain water, oils, dry ointments, or hydro-alcoholic solutions. As a result, The IC50 values of the MeOH extracts, EtOAc fractions, and the isolated compound were 186.5 ± 0.52 microgram/mL, 357.2 ± 0.59 microgram/mL, and 5.658 microgram/mL respectively. The MeOH extracts exhibited moderate antioxidant activity while the isolated compound exhibited strong antioxidant activity. The total flavonoid content of the MeOH extracts and EtOAc fraction was measured by a colorimetric assay, using reagents of 1 M sodium acetic and 10% aluminum chloride. The EtOAc fraction had a total flavonoid content of 4.505 mgQE/g-extract and total phenolic content of 13.732 mgGAE/g-extract while the MeOH extracts had a total flavonoid content of 9.088 mg QE/g-extract and total phenolic content of 23.34 mgGAE/g-extract respectively. Therefore, the utilization of MeOH extracts or the isolated compound of this fruit may be beneficial for developing skincare phytocosmetics and personal care products. Keywords: Phytocosmetics, antioxidant, Fagraea fragrans, tembesu fruit
Effect of Pt-Ni/C Catalyst Composition Prepared via Impregnation-Ball Milling on Electrochemical Performance and Hydrogen Production in PEMWE Novia Widia Ningsih; Dedi Rohendi; Addy Rachmat; Ady Mara; Muharni Muharni; Nyimas Febrika Sya'baniah; Dwi Hawa Yulianti; Diana Oktarina; Salsabilla Nabigha; Yollanda Nurcholifah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 11, No 2 (2026): June 2026
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v11.i2.117

Abstract

This study investigates the effect of Pt–Ni/C catalyst composition prepared via impregnation and ball milling on electrochemical performance and hydrogen production in Proton Exchange Membrane Water Electrolysis (PEMWE). Five Pt:Ni ratios (1:0, 3:1, 1:1, 1:3, and 0:1) were evaluated using Linear Sweep Voltammetry (LSV), Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), and hydrogen production tests at 0.5–2.5 A. The Pt-rich catalyst (1:0) exhibited the highest intrinsic activity, with the largest charge (16.03 × 10^-3 C) and electrochemically active surface area (4.90 m2/g), while the 3:1 composition showed the lowest charge transfer resistance. The 1:1 composition achieved the best hydrogen production performance at 2.9 mL/s under 1.5 A, with stable behavior across varying current conditions, indicating a synergistic Pt–Ni interaction that enhances catalytic efficiency. These findings establish a direct correlation between electrochemical characteristics and hydrogen production performance, demonstrating that optimal catalyst performance is governed by a balance between intrinsic activity, charge transfer properties, and active site availability. The Pt–Ni/C (1:1) catalyst represents a promising strategy for designing cost-effective electrocatalysts for PEMWE applications.Keywords: Pt–Ni/C; impregnation; ball milling; PEMWE; hydrogen evolution reaction
The Influence of Hydrogen Flow Rate and Humidifier Temperature on Performance of a PEMFC with Ti-Co/C Catalyst Nurmalina Adhiyanti; Dedi Rohendi; Muhammad Prima Utama; Nirwan Syarif; Addy Rachmat; Dwi Hawa Yulianti; Normah Normah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

This study explores the effect of hydrogen flow rate and humidifier temperature on the performance of the Membrane Electrode Assembly (MEA) using Ti-Co/C catalyst at the cathode and Pt/C at the anode in a single-cell Proton Exchange Membrane Fuel Cell (PEMFC). MEAs were fabricated by the spraying method and characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to determine their electrochemical surface area (ECSA) and conductivity. The results showed that the optimized ECSA value reached 8.38 cm2/g, and the electrical conductivity was 3.76 × 10-8 S/cm. The best performance was achieved at a hydrogen flow rate of 100 mL/min and room temperature humidification. Under the hydrogen flow rate test, the maximum power density reached 0.364 mW/cm2, while in the humidifier temperature variation, a maximum power density of 0.375 mW/cm2  was obtained at a current density 2.4 mA/cm2. These findings suggest that Ti-Co/C is a promising low-cost catalyst alternative to Pt and that operational conditions play a critical role in MEA performance
Hydrogen Production from Aluminum Waste Using the Aluminum-Water Method with Potassium as Activator Icha Amelia; Dedi Rohendi; Addy Rachmat; Nirwan Syarif; Dwi Hawa Yulianti; Nyimas Febrika Sya'baniah; Nurmalina Adhiyanti; Ory Adelia; Normah Normah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 9, No 2 (2024): June 2024
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v9.i2.111

Abstract

Research on hydrogen production from aluminum waste using the aluminum-water method using potassium as an activator has been successfully carried out. This research aims to determine the performance of the potassium activator in hydrogen production with variable water volume and potassium percentage. Hydrogen gas production is carried out using 60 mesh aluminum waste. Optimum conditions were achieved when a mass of 1 gram of aluminum was reacted with an additional volume of water of 1.5 mL, and 7% w/w of the activator mass, with the production of hydrogen gas of 553 mL at a production rate of 69 mL/minute.
Co-Authors A.M. Ramadhan Ady Mara Ahmad Fatoni Aldes Lesbani Aldi Herbanu Amelia, Icha Anisa Fitri Amatullah Bakri Rio Rahayu Bijak Riyandi Ahadito Dasril Basir Dea Radestia Rahmah Dedi Rohendi Dedi Rohendi Dedi Rohendi Dedi Rohendi Denada, Laellia Desnelli Desnelli Diana Oktarina Dimas Ardiyanta Dwi Hawa Yulianti Dwi Hawa Yulianti Dwi Hawa Yulianti Dwi Hawa Yulianti Dwi Hawa Yulianti Edy Herianto Majlan Edy Herianto Majlan, Edy Herianto Elfita Elfita Eliza Eliza Eliza Eliza Fahma Riyanti Fanani, Muhammad Zainal Fatma Fatma Fatma Fatma Fatma Fatmawati Fatmawati Fera Rahma Sari Ferlinahayati Ferlinahayati Handayani Citra Pratiwi Hardi Aji Badarwi Hasanuddin Hasanuddin Hasanudin Hasanudin Hasanudin hasanudin Hasanudin Hasanudin Hasanudin, Hasanudin Hermansyah Hermansyah Hermansyah Hermansyah Icha Amelia Isya Mahendra Julinar Julinar Julinar Julinar Julinar Julinar Laela Mukaromah Meiliza, Cici Muhammad Prima Utama Muhammad Said Muhammad Said Muhammad Said Muhammad Said MUHAMMAD SAID Muhammad Said Muharni Muharni Musifa, Eva Nabila Aprianti Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif Nirwan Syarif, Nirwan Normah Normah Normah Normah Novia Widia Ningsih Nur Hanis Hayati Hairom Nurlisa Hidayati Nurlisa Hidayati Nurlisa Hidayati Nurmalina Adhiyanti Nurmalina Adhiyanti Nurmalina Adhiyanti Nyimas Febrika Sya'baniah Nyimas Febrika Sya'baniah Nyimas Febrika Sya'baniah Ory Adelia Poedji Loekitowati Hariani Poedji Loekitowati Hariani Pratama, Nisa Manora Rahmah, Dea Ramadaini, Tiara Rio Aldo Syahputra Risfidian Mohadi Risfidian Mohadi Rizki, Widya Twiny Rr. Whiny Hardiyati Erliana Salni Salni Salni Salni Salni Salni Salsabilla Nabigha Susilawati Sya'baniah, Nyimas Syabaniah, Nyimas Febrika Syarif, Nirwan Sya’baniah, Nyimas Febrika Tarmizi Taher Widia Purwaningrum Widia Purwaningrum Yollanda Nurcholifah Yulianti, Dwi Yulianti, Dwi Hawa