Boosting the Phosphate Adsorption of Calcite by Low Mg2+-Doping

Yi-Fan Wang; Zuo-Bei Wang; Yong-Hui Zhang; You-Gui Huang; Xin Ye; Wei Wang

doi:10.1016/j.envres.2024.120692

Boosting the Phosphate Adsorption of Calcite by Low Mg²⁺-Doping

Environ Res. 2024 Dec 24:120692. doi: 10.1016/j.envres.2024.120692. Online ahead of print.

Authors

Yi-Fan Wang¹, Zuo-Bei Wang², Yong-Hui Zhang², You-Gui Huang¹, Xin Ye³, Wei Wang⁴

Affiliations

¹ College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China; CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China; Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China; Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
² CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China; Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China.
³ Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021. China. Electronic address: [email protected].
⁴ College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China; CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China; Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China; Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China. Electronic address: [email protected].

PMID: 39725139
DOI: 10.1016/j.envres.2024.120692

Abstract

Calcite is a promising material choice for adsorbing phosphates because of its abundance and environmentally benign nature. However, the slow adsorption kinetics and hence low adsorption capacity within a short time frame hinders its practical application. In this work, we solve these problems by presenting a low Mg²⁺-doped calcite adsorbent, Mg-10. With a 3.75 wt.% of Mg²⁺ doping, Mg-10 exhibits a remarkable adsorption capacity of 157.7 mg P/g. It also demonstrates a substantial boost in the adsorption kinetics, achieving a sixfold increase in adsorption capacity within 24 hours compared to the undoped calcite. Meanwhile, Mg-10 not only offers improved adsorption selectivity but also maintains a stable effluent pH, underscoring its environmental compatibility. By conducting soil column experiments, we find that Mg-10 quickly captures the excess phosphates during the mimicking fertilization process, and slowly releases the nutrient afterwards, which can increase the feralization efficiency. These results provide alternative strategies for managing phosphate pollution originated from fertilization, and underscores the potential of Mg-10 in sustainable agriculture and environmental remediation.

Keywords: Calcite; Mg-doped; adsorbents; fertilization; phosphate removal.