Immobilization of lead and cadmium from aqueous solution and contaminated sediment using nano-hydroxyapatite

被引：201
作者：
Zhang, Zizhong [1 ,2 ,3 ]
Li, Mengyan [1 ,2 ,3 ]
Chen, Wei [1 ,2 ,3 ]
Zhu, Shuzhen [1 ,2 ,3 ]
Liu, Nannan [1 ,2 ,3 ]
Zhu, Lingyan [1 ,2 ,3 ]
机构：
[1] Nankai Univ, Coll Environm Sci & Engn, Tianjin 300071, Peoples R China
[2] Nankai Univ, Minist Educ, Key Lab Pollut Proc & Environm Criteria, Tianjin, Peoples R China
[3] Nankai Univ, Tianjin Key Lab Urban Ecol Environm Remediat & Po, Tianjin 300071, Peoples R China
来源：
ENVIRONMENTAL POLLUTION | 2010年 / 158卷 / 02期
关键词：
Lead; Cadmium; Immobilization; Sediment; Nano-hydroxyapatite; PHOSPHATE AMENDMENTS; SORPTION KINETICS; HEAVY-METALS; SOILS; SPECIATION; ADDITIONS; REMOVAL; COPPER; PB;
D O I：
10.1016/j.envpol.2009.08.024
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The effectiveness and mechanism of nano-hydroxyapatite particles (nHAp) in immobilizing Pb and CA from aqueous solutions and contaminated sediment were investigated. The maximum sorption amount (Q(max)) of Pb and Cd in aqueous solution was 1.17 and 0.57 mmol/g. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) surface and depth analysis indicated that dissolution-precipitation is the primary immobilization mechanism for Pb, while surface complexation and intraparticle diffusion account for Cd sequestration. Different amounts of nHAp (0-10% nHAp/dry weight) were added to the contaminated sediment. Sequential extraction showed that nHAp could effectively reduce the exchangeable fraction of Pb and Cd in the sediment and significantly reduce the concentration in porewater. The results in this study showed that nHAp can immobilize Pb and Cd in sediment effectively. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：514 / 519
页数：6
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