Author:
Shen Jianglong,Li Juan,Mao Zhongan,Zhang Yang
Abstract
AbstractThe stable existence of heavy metals in soil under natural conditions is the core issue in heavy metal pollution solidification and remediation technology. However, the existing research is limited to soil passivation tests of different materials or biochar adsorption tests and cannot reveal the internal mechanism of functional groups of different compounds in soil passivation. This paper takes the common heavy metal ion Cd2+ as an example to analyze the stability of the combination of heavy metal ions and common ion groups in soil. The stability and existing form of Cd are analyzed by using first-principle calculations, and the free energy, band structure, and partial density of states of CdCO3, CdSO4, CdCl2, and CdSiO3 are computed. The stability of Cd binding to common anions in soil is determined. Results show the descending order of structural stability of cadmium compounds is CdSiO3, CdSO4, CdCO3, and CdCl2. SO42− and SiO32− can be used as preferred functional groups for cadmium pollution passivation. Anhydrous sodium sulfate and sodium silicate are promising passivators.
Funder
Natural Science Basic Research Program of Shaanxi Province
Shaanxi Provincial Technical Innovation Guidance Project
Internal scientific research project of Shaanxi Land Engineering Construction Group Co., Ltd
Shaanxi Province Innovative Talents Program-Youth Science and Technology Rising Star Project
Technology innovation Center for Land Engineering and Human Settlements, Shaanxi Land Engineering Construction Group Co., Ltd. and Xi'an Jiaotong University
Shaanxi Province Innovation Capability Support Plan Project
Publisher
Springer Science and Business Media LLC
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