IMMOBILIZATION MECHANISMS OF CHROMIUM IN CEMENT-BASED SOLIDIFIED WASTE

被引：5
|
作者：
Bobirica, Constantin [1 ]
Bobirica, Liliana [1 ]
Stanescu, Rodica [1 ]
Constantinescu, Ionel [1 ]
机构：
[1] Univ Politehn Bucuresti, Fac Appl Chem & Mat Sci, Bucharest 1, Romania
来源：
ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL | 2009年 / 8卷 / 04期
关键词：
adsorption; cement; chromium; immobilization mechanism; CHEMICAL SPECIATION; PART I; ETTRINGITE; PREDICTION; HYDRATION; CR(VI); WATER;
D O I：
10.30638/eemj.2009.106
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Knowledge of the binding mechanisms of heavy metals to cement minerals is essential for the prediction of the long-term leachability of cement-based solidified waste containing heavy metals. In this paper, the sorption of chromate ions onto calcium-silicate-hydrate (C-S-H) in equilibrated aqueous suspensions was investigated as a function of liquid-to-solid ratio. The hypothesis of super-equivalent adsorption was assumed to be involved in chromate ions immobilization. This hypothesis is supported by a well-fitted isotherm for sodium with Langmuir isotherm and a well relationship between sorbed chromium and sorbed sodium.
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页码：759 / 763
页数：5
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