Biosorption of divalent Pb, Cd and Zn on aragonite and calcite mollusk shells

被引：145
作者：
Du, Yang [1 ]
Lian, Fei [1 ]
Zhu, Lingyan [1 ]
机构：
[1] Nankai Univ, Key Lab Pollut Proc & Environm Criteria, Tianjin Key Lab Urban Ecol Environm Remediat & Po, Minist Educ,Coll Environm Sci & Engn, Tianjin 300071, Peoples R China
来源：
ENVIRONMENTAL POLLUTION | 2011年 / 159卷 / 07期
关键词：
Biogenic sorbent; Aragonite; Calcite; Heavy metals; Crystal lattice; MODIFIED BOMBYX-MORI; METAL-CATIONS; ADSORPTION; SORPTION; SURFACE; LEAD; HYDROZINCITE; SPECTROSCOPY; DISSOLUTION; ABSORPTION;
D O I：
10.1016/j.envpol.2011.04.017
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The potential of using mollusk shell powder in aragonite (razor clam shells, RCS) and calcite phase (oyster shells, OS) to remove Pb2+, Cd2+ and Zn2+ from contaminated water was investigated. Both biogenic sorbents displayed very high sorption capacities for the three metals except for Cd on OS. XRD, SEM and XPS results demonstrated that surface precipitation leading to crystal growth took place during sorption. Calcite OS displayed a remarkably higher sorption capacity to Pb than aragonite RCS, while the opposite was observed for Cd. However, both sorbents displayed similar sorption capacities to Zn. These could be due to the different extent of matching in crystal lattice between the metal bearing precipitate and the substrates. The initial pH of the solution, sorbent's dosage and grain size affected the removal efficiency of the heavy meals significantly, while the organic matter in mollusk shells affected the removal efficiency to a lesser extent. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1763 / 1768
页数：6
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