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Hanifah Sriamelia
Universitas Negeri Padang, Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics

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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.
Magnetic Nanocomposites from Rice Husk Ash for Heavy Metal Adsorption in Groundwater Fadhilah Nur Afifah; Salsabilla; Hanifah Sriamelia
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.v3i2.611

Abstract

Heavy metal contamination in groundwater poses serious risks to human health and ecosystems, requiring effective and sustainable remediation strategies. This study reports the synthesis of magnetic nanocomposites derived from rice husk ash (RHA) and Fe₃O₄ nanoparticles for the removal of Pb(II), Cd(II), Cr(VI), and As(V). RHA, a silica-rich agricultural waste, was converted into nano-silica via alkaline extraction and combined with Fe₃O₄ through co-precipitation. The synthesized nanocomposites were characterized using XRD, FTIR, SEM-EDX, BET, and VSM, confirming a high surface area (254.8 m²/g), strong magnetization (38.7 emu/g), and nanoscale particle size (10.3 nm). Batch adsorption experiments under optimal conditions (pH 6.0, contact time 120 min, adsorbent dose 1.0 g/L) showed removal efficiencies exceeding 90% for all metals. Maximum adsorption capacities based on the Langmuir model were 204.1 mg/g for Pb(II), 158.3 mg/g for Cd(II), 179.6 mg/g for Cr(VI), and 132.9 mg/g for As(V). Kinetic analysis followed a pseudo-second-order model, indicating chemisorption. The nanocomposites also demonstrated good reusability over five cycles, highlighting their potential as low-cost, eco-friendly adsorbents for groundwater treatment.
Utilization of Microalgae as Carbon Absorbent Material for Environmentally Friendly Concrete in Tropical Coastal Areas Risjunardi Damanik; Khadijah; Hanifah Sriamelia
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.685

Abstract

This study evaluates the mechanical, durability, and carbon sequestration performance of a 1:1 blend of Chlorella vulgaris and Spirulina platensis biomass as a supplementary cementitious material (SCM) in concrete for tropical coastal infrastructure. Five replacement levels (0%, 3%, 5%, 7%, and 10% by weight of cement) were tested under ambient tropical conditions (28–32°C, 75–85% RH) reflecting West Sumatra's coastal environment. Compressive and flexural strength, water absorption, chloride penetration resistance, and CO₂ sequestration via thermogravimetric analysis were comprehensively assessed. Results indicate that 5% replacement (MA-5) achieved the optimal balance: 28-day compressive strength of 31.4 MPa (6.4% below control), while demonstrating 12.3% improved chloride resistance and a net carbon sequestration rate of 38.7 kg CO₂/m³ of concrete. Scanning electron microscopy confirmed microalgae cell-wall fragments filling interfacial transition zones, reducing porosity by 11.2% and enhancing matrix densification. The findings demonstrate that microalgae-incorporated concrete at 5% OPC replacement is a technically viable, low-carbon alternative for coastal tropical construction, offering both structural adequacy and environmental benefits. Adoption in Indonesia's green building programs is recommended, with future research needed to validate performance at industrial scale and assess long-term durability under field marine exposure.
Co-Authors Erlinda Ningsih Fadhilah Nur Afifah Khadijah Risjunardi Damanik Salsabilla