Sensitivity of Freundlich equation constant 1/n for zinc sorption on changes induced in calcite by mechanical activation

被引:48
作者
Baláz, P [1 ]
Alácová, A [1 ]
Briancin, J [1 ]
机构
[1] Slovak Acad Sci, Inst Geotech, Kosice 04353, Slovakia
关键词
zinc; adsorption; Freundlich; calcite; mechanical activation;
D O I
10.1016/j.cej.2005.08.017
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work presents an attempt to modify the properties of calcite by mechanical activation in order to enhance its capacity for heavy metal removal. The equilibrium isotherms of zinc adsorption onto the mineral show the data correlate well with Freundlich model. Experiments with temperature changes in sorption tests proved that chemisorption plays the main role in zinc sorption on calcite. The solid-state properties of calcite (surface area, particle size, particle morphology and crystallinity) has been modified by mechanical activation (high-energy milling) and the structure sensitivity parameter, S-A/X (S-A: Specific surface area and X: crystallinity) has been used for the characterization of mechanically activated calcite. The good linear correlation (R = 0.92) between Freundlich parameter 1/n and log(S-A/X) has been found. The experimental results proved that the mechanically activated calcite is an effective sorbent for Zn removal from water solutions. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:115 / 121
页数:7
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