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All Journal Science Get Journal Inventa: Journal of Science, Technology, and Innovation
Hanifah Sriamelia
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Physics

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Pengaruh Jenis Asam Mineral Pada Sintesis Acid Activated Montmorillonite Terhadap Struktur, Morfologi, dan Performa Bleaching Earth Hanifah Sriamelia; Riri Jonuarti
Journal of Science, Technology, and Innovation Vol 1 No 3 (2026): : April: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/qjnaem59

Abstract

Montmorillonite (MMT) is a clay mineral belonging to the smectite group, characterized by a large surface area, high cation exchange capacity, and a layered structure, making it a promising bleaching earth for palm oil refining. However, natural montmorillonite exhibits limitations, including a low number of active sites and limited porosity, thus requiring acid activation to enhance its performance. This study aims to analyze the effect of different mineral acids on the crystal structure, morphology, and bleaching performance of acid-activated montmorillonite. Activation was carried out using HCl, H₂SO₄, HNO₃, and H₃PO₄ at a concentration of 1 M for 3 hours. Characterization was conducted using X-ray diffraction (XRD) to determine crystallinity, scanning electron microscopy (SEM) to observe surface morphology, and UV–Vis spectrophotometry to evaluate bleaching performance. The XRD results revealed that sulfuric acid produced the largest crystal size (78.8 nm) with the highest degree of homogeneity. Activation with HCl resulted in a crystal size of 64.5 nm, H₃PO₄ yielded 68.3 nm, and HNO₃ produced 68.5 nm. SEM analysis showed the formation of new pores and a rougher surface texture after activation. HCl activation yielded the most favorable surface morphology. Bleaching tests demonstrated a significant reduction in color intensity and β-carotene content in palm oil.  
Zeolite Nanocomposites from Coal Fly Ash for Arsenic Removal in Wastewater Erlinda Ningsih; Hanifah Sriamelia; Salsabilla
Science Journal Get Press Vol 3 No 2 (2026): April, 2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i2.575

Abstract

Arsenic contamination in wastewater poses serious environmental and public health risks because of its toxicity, persistence, and bioaccumulation potential. This study investigated the synthesis and performance of magnetic zeolite nanocomposites (MZN) derived from coal fly ash (CFA) for efficient As(V) removal from wastewater. CFA obtained from the PT PLN Ombilin Power Plant, West Sumatra, Indonesia, was converted into zeolite NaA/NaX through an alkaline hydrothermal method and subsequently modified with Fe₃O₄ nanoparticles to enhance adsorption capacity and magnetic separability. The synthesized MZN was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX), Brunauer–Emmett–Teller (BET), and vibrating sample magnetometer (VSM) analyses. Batch adsorption experiments were conducted to evaluate the effects of pH, contact time, adsorbent dosage, initial arsenic concentration, and temperature on adsorption performance. The maximum As(V) removal efficiency reached 97.4% under optimum conditions of pH 6, adsorbent dosage of 2 g/L, and contact time of 120 min. Adsorption behavior followed the Langmuir isotherm and pseudo-second-order kinetic models, indicating monolayer chemisorption. Thermodynamic analysis confirmed a spontaneous and endothermic process. Regeneration tests showed that MZN maintained over 85% removal efficiency after five adsorption–desorption cycles, demonstrating its potential as an effective, reusable, and low-cost adsorbent for industrial wastewater treatment.
Co-Authors Erlinda Ningsih, Erlinda Riri Jonuarti Salsabilla