Zeolite Nanocomposites from Coal Fly Ash for Arsenic Removal in Wastewater
DOI:
https://doi.org/10.69855/science.v3i2.575Keywords:
Coal Fly Ash, Zeolite, Nanocomposite, Arsenic, Adsorption, Wastewater TreatmentAbstract
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.
References
Abdollahi, Y., Abdullah, A. H., Zainal, Z., & Yusof, N. A. (2020). Adsorption behavior of arsenic onto iron-modified magnetic adsorbents: Kinetics and mechanism studies. Journal of Environmental Chemical Engineering, 8(4), 104102.
Bhatt, R., Singh, P., Kumar, M., & Gupta, V. K. (2023). Economic feasibility and sustainability assessment of magnetic adsorbents for wastewater treatment. Journal of Cleaner Production, 402, 136812.
Chen, L., Wang, H., Zhao, Y., & Liu, X. (2022). Magnetic biochar composite for efficient arsenic adsorption from aqueous solutions. Chemosphere, 307, 135768.
Gao, Y., Li, X., Zhang, H., & Wang, J. (2021). Hydrothermal synthesis of zeolite from coal fly ash for environmental applications. Journal of Cleaner Production, 295, 126404.
Hu, X., Ding, Z., Zimmerman, A. R., Wang, S., & Gao, B. (2020). Iron-modified adsorbents for arsenic removal from water: Mechanisms and performance evaluation. Water Research, 182, 115966.
Irfan, M., Putra, A., & Rahman, F. (2021). Heavy metal contamination in Indonesian mining wastewater and its environmental impact. Environmental Monitoring and Assessment, 193, 512.
Li, X., Zhao, H., Wang, Y., & Chen, J. (2021). Magnetic Fe₃O₄ nanocomposites for arsenic adsorption: Mechanisms and environmental applications. Chemical Engineering Journal, 420, 127657.
Melián-Cabrera, I., Rodríguez, A., & Pérez, M. (2020). Fly ash-derived zeolites for wastewater remediation applications. Microporous and Mesoporous Materials, 294, 109873.
Reddy Angaru, G. K., Choi, Y. L., Lingamdinne, L. P., Koduru, J. R., Yang, J. K., Chang, Y. Y., & Karri, R. R. (2022). Portable SA/CMC entrapped bimetallic magnetic fly ash zeolite spheres for heavy metals contaminated industrial effluents treatment via batch and column studies. Scientific Reports, 12, 3430.
Santosa, B. A., França, A. M. M., da Silva, L. T. V., Gouveia, A. G. S., Vidal, C. B., Loiola, A. R., & Nascimento, R. F. (2022). Magnetic zeolite from fly ash as a cost-effective adsorbent for Cu²⁺, Pb²⁺, Zn²⁺, and Cd²⁺ removal from aqueous media: A comprehensive study. International Journal of Environmental Analytical Chemistry, 104(16), 3913–3935.
Wang, H., Zhao, X., Liu, Y., & Zhang, J. (2022). Hierarchical magnetic porous adsorbents for heavy metal removal from wastewater. Journal of Hazardous Materials, 424, 127555.
Wang, S., Gao, B., Li, Y., Zimmerman, A. R., Cao, X., & Peng, P. (2020). Advances in fly ash-based adsorbents for arsenic and heavy metal removal. Journal of Cleaner Production, 267, 122143.
Xu, Y., Zhang, Q., Chen, J., & Liu, H. (2021). Hierarchical porous magnetic adsorbents for efficient removal of arsenic from aqueous solution. Separation and Purification Technology, 276, 119356.
Zhang, Y., Li, H., Chen, L., & Wang, X. (2020). Magnetic iron oxide-based adsorbents for arsenic removal: A review. Journal of Environmental Management, 260, 110135.
Zhang, Z., Liu, Y., Wang, H., & Chen, X. (2024). In-situ synthesis of modified zeolite with high zirconium content using fly ash and its efficient removal for As(V) in solution. Journal of Environmental Chemical Engineering, 12(2), 112212.
Zhao, L., Wang, Y., Sun, H., & Chen, Q. (2025). Bimetallic ion location and their synergistic effect on arsenic adsorption in fly ash-based modified zeolite: Experimental and simulation approaches. Journal of Environmental Chemical Engineering, 13(1), 114205
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