Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

被引:261
作者
Feng, Xiong Han
Zhai, Li Mei
Tan, Wen Feng
Liu, Fan [1 ]
He, Ji Zheng
机构
[1] Huazhong Agr Univ, Minist Agr, Key Lab Subtrop Agr Resource & Environm, Wuhan 430070, Peoples R China
[2] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
基金
高等学校博士学科点专项科研基金; 中国国家自然科学基金;
关键词
Mn oxide mineral; heavy metal; adsorption; redox; surface properties;
D O I
10.1016/j.envpol.2006.05.028
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Several Mn oxide minerals commonly occurring in soils were synthesized by modified or optimized methods. The morphologies, structures, compositions and surface properties of the synthesized Mn oxide minerals were characterized. Adsorption and redox reactions of heavy metals on these minerals in relation to the mineral structures and surface properties were also investigated. The synthesized birnessite, todorokite, cryptomelane, and hausmannite were single-phased minerals and had the typical morphologies from analyses of XRD and TEM/ED. The PZCs of the synthesized birnessite, todorokite and cryptomelane were 1.75, 3.50 and 2.10, respectively. The magnitude order of their surface variable negative charge was: birnessite >= cryptomelane > todorokite. The hausmannite had a much higher PZC than others with the least surface variable negative charge. Birnessite exhibited the largest adsorption capacity on heavy metals Pb2+, Cu2+, Co2+, Cd2+ and Zn2+, while hausmannite the smallest one. Birnessite, cryptomelane and todorokite showed the greatest adsorption capacity on Pb2+ among the tested heavy metals. Hydration tendency (pK(1)) of the heavy metals and the surface variable charge of the Mn minerals had significant impacts on the adsorption. The ability in Cr(III) oxidation and concomitant release of Mn2+ varied greatly depending on the structure, composition, surface properties and crystallinity of the minerals. The maximum amounts of Cr(III) oxidized by the Mn oxide minerals in order were (mmol/kg): birnessite (1330.0) > cryptomelane (422.6) > todorokite (59.7) > hausmannite (36.6). (C) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:366 / 373
页数:8
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