Lanthanum-modified tobermorite synthesized from fly ash for efficient phosphate removal

被引：1

作者：

Wang Z. ^{[1
]}

Zhu G. ^{[1
]}

Zhou Y. ^{[1
]}

Wen Z. ^{[1
]}

Wu D. ^{[2
]}

机构：

[1] School of Resources and Environment, Nanchang University, Nanchang

[2] School of Materials and Chemical Engineering, Pingxiang University, Pingxiang

来源：

Environmental Science and Pollution Research | 2024年 / 31卷 / 20期

基金：

中国国家自然科学基金;

关键词：

Adsorption; Fly ash; Lanthanum modification; Phosphate; Tobermorite;

D O I：

10.1007/s11356-024-33153-9

中图分类号：

学科分类号：

摘要：

Phosphate removal from water by lanthanum-modified tobermorite synthesized from fly ash (LTFA) with different lanthanum concentrations was studied. LTFA samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and Brunauer‒Emmett‒Teller specific surface area analysis. The results showed that the LTFA samples were mainly composed of mesoporous tobermorite-11 Å, and LTFA1 with a lanthanum concentration of 0.15 M had a high specific surface area (83.82 m2/g) and pore volume (0.6778 cm3/g). The phosphate adsorption capacities of LTFA samples were highest at pH 3 and gradually decreased with increasing pH. The phosphate adsorption kinetics data on LTFA samples were most accurately described by the Elovich model. The adsorption isotherms were in the strongest agreement with the Temkin model, and LTFA1 showed the highest phosphate adsorption capacity (282.51 mg P/g), which was higher than that of most other lanthanum-modified adsorbents. LTFA1 presented highly selective adsorption of phosphate with other coexisting ions (HCO3−, Cl−, SO42−, and NO3−). In addition, phosphate was adsorbed onto LTFA samples by forming inner-sphere phosphate complexes and amorphous lanthanum phosphate. This study provides technical support for development of efficient fly ash-based phosphate adsorbents. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

引用

页码：29584 / 29594

页数：10

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