Cadmium(II) adsorption by activated carbon: batch studies and reversibility

被引：1
|
作者：
Carvalho, Wagner A. [1 ]
Zanin, Cristiane I. C. B. [2 ]
Zanutelo, Cristiane [2 ]
Figueiredo, Flavia C. A. [2 ]
Cestari, Antonio R. [3 ]
Vieira, Eunice F. S. [3 ]
机构：
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Rua Catequese 242, BR-09090400 Santo Andre, SP, Brazil
[2] Univ Estadual Campinas, Fac Chem Engn, BR-13083970 Campinas, SP, Brazil
[3] Univ Fed Sergipe, Dept Chem CCET, Lab Mat & Calorimetry, BR-49100000 Sao Cristovao, SE, Brazil
来源：
INTERNATIONAL JOURNAL OF ENVIRONMENTAL TECHNOLOGY AND MANAGEMENT | 2010年 / 12卷 / 2-4期
关键词：
cadmium(II) adsorption; activated carbons; heavy metals removal; effluent pollution; desorption; recycling;
D O I：
10.1504/IJETM.2010.031532
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Adsorption of cadmium(II) by Brazilian activated carbons, in their original and nitric acid activated forms, was evaluated. The equilibrium was reached within the first 15 min of contact between carbon and metal solution, and obeys a pseudo-second order Lagergren model. The maximum adsorption capacity is higher than 64 mg/g for the oxidised sample. Negative Delta G(0) values indicate the spontaneity of the adsorption process. Thermodynamic results emphasise that chemisorption plays an important role in the adsorption by oxidised carbon. Moreover, this sample can be efficiently recycled by treatment with HCl, allowing total recover of adsorbed cadmium(II) during four adsorption/desorption cycles.
引用
收藏
页码：257 / 276
页数：20
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