Open Access

ARTICLE

Preparation of Iron-Pillared Bentonite/Oyster Shell Composite and Phosphate Adsorption in Water

by Zhijian Zhou¹, Jie Yan^1,*, Xinxiang Du¹, Qiulin Xu¹, Zijun Wu², Jinlan Yang³, Xitong Fang¹, Qiuling Zhong², Qiaoguang Li^1,*

1 College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
2 College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
3 Building Energy Efficiency Research Institute, Guangdong Provincial Academy of Building Research Group Co, Ltd., Guangzhou, 510500, China

* Corresponding Authors: Jie Yan. Email: ; Qiaoguang Li. Email:

Journal of Renewable Materials 2023, 11(9), 3501-3515. https://doi.org/10.32604/jrm.2023.027852

Received 17 November 2022; Accepted 27 December 2022; Issue published 20 July 2023

Abstract

Iron-pillared bentonite (FB) was prepared by Fe(III) modified bentonite, and then the composites (FB-OS) were prepared by iron-pillared bentonite and oyster shell powder. The composites were characterized by FTIR, SEM, TGA, and EDS, and the phosphorus removal test was carried out. The results showed that FB-OS contained a large amount of CaO. Its structure was compact, but there were gaps in it. The maximum bending stress and compressive strength were 43.7 N and 0.927 MPa, respectively. The phosphorus removal test showed that the phosphorus removal rate of FB-OS was more than 90%, and measured the maximum adsorption capacity was 48.31 mg/g. A large amount of spherical products were produced on the surface and inside of FB-OS after phosphorus removal, it was speculated that spherical products were amorphous calcium phosphate in the paper. Analysis indicated that there was chemical adsorption during phosphorus removal. The kinetic equation of phosphorus adsorption by FB-OS was (R² = 0.995). The adsorption rate was mainly controlled by outer film diffusion and intraparticle diffusion.

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