期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 366, 期 -, 页码 684-693出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.12.049
关键词
Cd immobilization; Mineral conversion; Hydroxyapatite; Microbial induced calcite precipitation
资金
- National Natural Science Foundation of China [41573098, 41877135]
- National Key Research and Development Plan of China [2016YFD0800704]
- Natural Science Foundation of Guangdong Province [2017A030313223]
- Science and Technology Planning Project of Guangdong Province [2017B030314175]
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection [KJS1333]
As one of the most toxic heavy elements, humans are mainly exposed to cadmium (Cd) via daily diets and smoking. Calcite can be used as an amendment directly or precipitated in situ based on microbial-induced carbonate precipitation (MICP) technology to immobilize Cd in soil with potential release of Cd due to calcite dissolution. Therefore, we converted microbial-induced calcite to less soluble hydroxyapatite and investigated the phase and morphology evolutions of the solids, as well as the immobilized efficiency, distribution and release of Cd. The results showed that the conversion of calcite to hydroxyapatite enhanced Cd removal efficiency up to 1.67% and 33.14% compared to the MICP process and adsorption by calcite, respectively. Accordingly, the released Cd decreased up to 94.10% and 99.96%, respectively. Our findings demonstrated that the conversion of calcite to hydroxyapatite might control the environmental behavior of heavy metals like Cd and can potentially be applied for soil remediation.
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