Removal of copper and cadmium ions from diluted aqueous solutions by low cost and waste material adsorbents

被引:155
|
作者
Ulmanu, M
Marañón, E
Fernández, Y
Castrillón, L
Anger, I
Dumitriu, D
机构
[1] Inst Nonferrous & Rare Met, Bucharest, Romania
[2] Univ Oviedo, Higher Sch Ind Engn, Dept Chem Engn & Environm Technol, Gijon 33204, Spain
来源
WATER AIR AND SOIL POLLUTION | 2003年 / 142卷 / 1-4期
关键词
adsorbents; cadmium; copper; isotherms; removal; waste materials;
D O I
10.1023/A:1022084721990
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The sorption of copper and cadmium ions using activated carbon, kaolin, bentonite, diatomite and waste materials such as compost, cellulose pulp waste and anaerobic sludge as sorbents is reported. Equilibrium isotherms were obtained for the adsorption of these metals in single and binary solutions. Bentonite presented the highest adsorption capacities for both copper and cadmium. A competitive uptake was observed when both metals are present; copper being preferentially adsorbed by all materials with the exception of anaerobic sludge. Equilibrium data were fitted to Langmuir and Freundlich models, with satisfactory results for most of the adsorbent-metal systems studied. Of all the adsorbents studied, bentonite and compost presented the highest removal efficiencies, reaching 99% for copper when cadmium is also present, for initial solution concentrations of up to 100 mg L-1. Anaerobic sludge has a greater preference for cadmium, even in the presence of copper, with removal efficiencies of 98% for similar concentrations to those mentioned above.
引用
收藏
页码:357 / 373
页数:17
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