期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 343, 期 -, 页码 332-339出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2017.09.053
关键词
Sediment immobilization; Rhamnolipid; Chlorapatite; Lead; Cadmium
资金
- Program for National Natural Science Foundation of China [51521006, 51278176, 51378190, 51579098]
- Hunan Provincial Science and Technology Plan [2016RS3026]
- Hunan Innovation Project of the Postgraduate [CX2017B095]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- National Program for Support of Top-Notch Young Professionals of China
Phosphate (P) compounds are usually used as chemical amendment for in situ remediation of heavy metal polluted sediment. However, the low deliverability, weak utilization and potential risk of eutrophication inhibit the application of most P materials. Therefore, rhamnolipid (Rha), a kind of anionic biosurfactant which has algicidal activity, was employed in this study to synthesize a new kind of nano-chlorapatite (nClAP) for Pb and Cd immobilization. Characterization results showed that the Rha stablized nClAP (Rha-nClAP) was uniformly distributed in suspensions within about 5 nm. Experimental data demonstrated that the combination of Rha and nClAP could greatly enhance the Pb- and Cd-immobilization efficiencies, promoting their transformation from labile fractions to stable fractions through precipitation or adsorption processes, especially when the Rha approached to its critical micelle concentration. And Rha-nClAP could also decrease both the TCLP-leachable Pb and Cd with maximum reduction efficiencies of 98.12% and 96.24%, respectively, which also presented concentration dependence of Rha. Changes of available phosphorus implied the dissolution of nClAP during the treatment and the detection of organic matter demonstrated that the microorganisms may involve in the remediation. (C) 2017 Elsevier B.V. All rights reserved.
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