期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 714, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.136550
关键词
Cadmium; Soil; Sulphur-modified biochar; Immobilization mechanism
资金
- National Natural Science Foundation of China [41471236]
- Open Fund of Joint International Research Laboratory of Agriculture and Agri-Product Safety
- Ministry of Education of China [JRK20180010]
- Agricultural Science and Technology Innovation Fund of Jiangsu Province [CX(17)3043]
- open foundation of State Key Laboratory of Soil and Sustainable Agriculture [Y20160017]
Cadmium (Cd) pollution in soils has received considerable research attention globally, and sulphur-modified biochar (SBC) could combine the advantages of biochar and the sulphur element for Cd remediation. Biochar from agricultural waste is feasible, which has a low preparation cost. However, there are few studies regarding the effects of the sulphur modification of biochar on the Cd immobilization mechanism. This study aimed to research the Cd immobilization mechanism of pristine wheat straw biochar (BC) and sulphur-modified biochar (SBC), and the Cd immobilization effects of BC and SBC in Cd-contaminated soils. Elemental and SEM analysis confirmed that sulphur was successfully loaded on the pristine biochar. XPS analysis confirmed that there was a considerable discrepancy between adsorption mechanisms of Cd on BC and SBC. In particular, cadmium sorption on BC was due to Cd(OH)(2) and CdCO3 precipitation formation and interaction with carbonyl and carboxyl groups, whereas on SBC, sorption was mainly due to CdS and CdHS+ formation and interaction with organic sulphide. In the incubation experiment, SBC and BC additions increased pH value and also reduced the available Cd concentrations in the soil. Compared with the control, the contents of available Cd in soil were significantly decreased by 15.86% similar to 22.10% and 22.72% similar to 27.90%, following treatments with BC and SBC, respectively. (C) 2020 Elsevier B.V. All rights reserved.
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