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Ngày xuất bản: 14/12/2024
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DOI: https://doi.org/10.52714/dthu.14.5.2025.1531
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Tập 14 Số 5 (2025): Chuyên san Khoa học Tự nhiên (Tiếng Anh)
Chuyên mục
Khoa học Tự nhiên (Tiếng Anh)
Trích dẫn bài báo
Luong, H. V. T., Le, T. P., Nguyen, N. Y., & Pham, D. T. (2024). Utilizing silica from rice husk ash to synthesize NaX zeolite for adsorbing Cr(VI) ions from water. Tạp chí Khoa học Đại học Đồng Tháp, 14(5), 98-108. https://doi.org/10.52714/dthu.14.5.2025.1531

Utilizing silica from rice husk ash to synthesize NaX zeolite for adsorbing Cr(VI) ions from water

Luong Huynh Vu Thanh1, , Le Thanh Phu2, Nguyen Ngoc Yen2,3, Pham Duy Toan3
1 Faculty of Chemical Engineering, Can Tho University
2 Applied Chemical Engineering Lab, Can Tho University, Vietnam
3 Department of Health Sciences, Can Tho University, Vietnam

Nội dung chính của bài viết

Tóm tắt

This study aimed to use rice husk ash (RHA) as an agricultural by-product combined with heat treatment to recover silica and synthesize zeolite NaX through a hydrothermal method, optimizing the synthesis conditions. The molar ratio of reactants used in the synthesis was 4.2Na2O:Al2O3:3SiO2:18H2O, with an aging time of 24 hours at room temperature and a crystallization time of 6 hours at 100°C. The adsorption of Cr(VI) ions in solution was optimized under conditions of pH 4.0, an initial Cr(VI) concentration of 120 mg/L, and a 30-minute adsorption time. The properties of the synthesized materials were characterized by X-ray diffraction (XRD) to identify characteristic diffraction peaks, and scanning electron microscopy (SEM) showed that the zeolite NaX had an average diameter of 113.16±0.12 nm. The study assessed the first-order and second-order adsorption kinetic models, as well as the Langmuir, Freundlich, and Dubinin-Radushkevich adsorption isotherms. Under the kinetic models, the adsorption of Cr(VI) ions onto the zeolite NaX followed the Langmuir isotherm model, with second-order kinetics and physical adsorption.

Từ khóa

Adsorbent, adsorption, hexavalent chromium ions, NaX zeolite, rice husk ash

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Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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