期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 320, 期 -, 页码 278-288出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2016.08.038
关键词
Sediment; Nano-chlorapatite; Pb immobilization; Leachability; Chemical speciation
资金
- National Natural Science Foundation of China [51521006, 51378190, 51278176, 51579098, 51108178]
- Environmental Protection Technology Research Program of Hunan [2007185]
- Program for New Century Excellent Talents in University [NCET-13-0186]
- Scientific Research Fund of Hunan Provincial Education Department [521293050]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
During the past years, efforts have been made to deal with the Pb contaminated sediment in Xiawangang River in Hunan province, China, but it remains a serious problem since the smelting pollutants were accumulated. According to previous studies, phosphate showed an effective ability to transfer labile Pb to pyromorphite (Pb-5(PO4)(3)X, X = F, Cl, Br, OH) but its application was limited by its solubility and deliverability. Hence a new class of nano-chlorapatite was synthesized by using sodium dodecyl sulfate (SDS) as a stabilizer and characterized by TEM, FESEM, DLS, FTIR, and EDAX. Results demonstrated that the SDS stabilized nano-chlorapatite (SDS-nClAP) was in spherical or spheroidal shape with a hydrodynamic diameter of 40.4 nm. Experimental data suggested that SDS-nClAP was effective in transforming labile Pb to stable fraction with a maximum increase of 38.3%, also the reduction of TCLP-leachable Pb from 0.30 to 0 mg/L after 45-d treatment. The increase of available phosphorus in both SDS-nClAP and ClAP treated sediment samples verified dissolution-precipitation mechanism involved in Pb immobilization. Additionally, the increment of organic matter in 10:1 treated samples was approximately 5-fold than that in 2:1 treated samples, which revealed that the micro-organisms may play an important role in it. (C) 2016 Elsevier B.V. All rights reserved.
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