期刊
SOIL & SEDIMENT CONTAMINATION
卷 29, 期 1, 页码 96-106出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15320383.2019.1679086
关键词
Stabilization; cadmium; soil; surface-modified nano-silica; heavy metal contamination
资金
- National Natural Science Foundation of China [51704093, 21571051]
- Science and Technology Development Project of Henan Province [181100310600]
- Open Funding Project of National Key Laboratory of Human Factors Engineering [SYFD180051810K, 614222207041813]
- Henan University [2018YLTD16]
- Key Project of Science and Technology Research of Henan Provincial Department of Education [19A610003]
Cadmium (Cd) contamination in agricultural soils is a widespread problem in China. In situ stabilization has been considered as one of the appropriate methods in remediation of Cd-contaminated soils. Besides the stabilization efficiency, more information regarding the influences of the stabilizer on soil properties is also required. In the present research, surface-modified nano-silica (SMNS) was used to remediate Cd-contaminated agricultural soils. When the dosage of SMNS was at 1%, the diethylenetriaminepentaacetic (DTPA)-extractable Cd decreased from 1.32 mg/kg to 0.116mg/kg on the 180th day, with the stabilization efficiency of 91.21%. Meanwhile, the exchangeable and carbonate-bounded Cd decreased 69.26 and 48.39%, respectively. Correlation analyses implied that SMNS transferred the exchangeable and carbonate-bounded fractions of Cd to the residual fraction. Furthermore, the mobility of Cd in soil also decreased from 45.78 to 18.95%. Mechanism analysis revealed that Cd was adsorbed on SMNS mainly by -SH and -OH bonds. Besides that, the addition of SMNS had negligible influences on soil properties. These results indicate that SMNS has great advantages and potential in stabilizing Cd-contaminated agricultural soils.
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