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All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) CHEESA: Chemical Engineering Research Articles
Ady Mara
Universitas Sriwijaya
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science

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Green Synthesis of CuO-Doped Fe₃O₄ for Degradation of Crystal Violet Dye: RSM-Based Optimization Ady Mara; Fahma Riyanti; Desnelli; Poedji Loekitowati Hariani
CHEESA: Chemical Engineering Research Articles Vol. 9 No. 1 (2026): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v9i1.24394.1-14

Abstract

The limitations of CuO photocatalyst include high electron–hole recombination and low charge-transfer efficiency. In this context, doping with Fe3O4 is used to form a heterojunction, which enhances charge separation, increases electron transfer, and imparts magnetic properties for easy separation and reuse of the catalyst. Therefore, this study aimed to synthesize a biphasic CuO/Fe₃O₄ composite using Rhodomyrtus tomentosa leaf extract as a green reducing agent, and evaluate the performance as a photocatalyst for the degradation of Crystal Violet Dye (CVD). Structural, morphological, optical, and magnetic properties were characterized using X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX), UV–Vis diffuse reflectance spectroscopy (DRS), and vibrating sample magnetometer (VSM). XRD patterns confirmed the coexistence of CuO and Fe₃O₄ phases, indicating successful composite formation. VSM analysis reported that the composite had magnetic properties with a saturation magnetization and band gap values of 46.92 emu/g and 1.63 eV, respectively. Process optimization was conducted using Response Surface Methodology (RSM) based on Central Composite Design (CCD). The results showed that the quadratic model was the most appropriate and statistically significant model, indicated by a p-value < 0.05 with a coefficient of determination (R2) of 0.9953. In addition, optimization of the degradation process led to CVD degradation efficiency of 98.73% under optimal conditions of initial concentration of 25.4 mg/L, pH 9.5, and irradiation time of 39.4 min with a visible-light radiation source. The composite also reported good reusability, retaining 92.11% of degradation efficiency after five cycles, confirming the potential as a magnetically recoverable, environmentally sustainable photocatalyst for wastewater treatment applications.
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&#039;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
Chitosan-ZnO Composite for Removal of Methylene Blue Desnelli Desnelli; Leidya Yulinda; David Fernando; Fatma Fatma; Ady Mara
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 8, No 3 (2023): October 2023
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v8.i3.133

Abstract

This study aims to determine the effectiveness and increase in absorption of the chitosan-ZnO composite in the process of removing methylene blue when using the photodegradation method with the help of a UV lamp. Chitosan was synthesized from shrimp shell waste composite with metal oxide ZnO. The results of the characterization using XRD obtained the diffraction peak for chitosan at an angle of 2θ, namely 19.85°; 29.43°; 34.76° and chitosan-ZnO composite at an angle of 20.18°; 28.93°; 33.57° The SEM-EDX characterization shows that chitosan-ZnO has small, light-colored grains and more gaps and contains elements of chitosan and Zn. In the FTIR characterization, there was a decrease in intensity at a peak of around 3360 cm-1 which was caused by the chitosan-ZnO composite producing OH groups which reacted with methylene blue dye. In testing the effect of contact time using a UV lamp, there was an increase in the percentage of degraded methylene blue compared to without using a UV lamp. The maximum contact time is obtained at 60 minutes. While testing the effect of methylene blue dye concentration, the maximum absorption concentration was 45 ppm at 60 minutes of contact time. The adsorption capacity of the composite against methylene blue dye without UV light was 18.91 mg/g while using a UV lamp it increased to 20.145 mg/g. Based on this research, the chitosan/ZnO composite can be used quite well as a methylene blue dye remover.Keywords: Chitosan, Chitosan-ZnO, Photodegradation, Adsorption, Methylene blue.
Co-Authors Addy Rachmat David Fernando Desnelli Desnelli Desnelli Diana Oktarina Dwi Hawa Yulianti Fahma Riyanti Fatma Leidya Yulinda Muharni Muharni Novia Widia Ningsih Nyimas Febrika Sya&#039;baniah Poedji Loekitowati Hariani Salsabilla Nabigha Yollanda Nurcholifah