Kinetic studies of Cd (II) and Pb (II) ions biosorption from aqueous media using untreated and chemically treated biosorbents

被引：5

作者：

Bakyayita, G. K. ^{[1
,3
]}

Norrstrom, A. C. ^{[1
]}

Nalubega, M. ^{[2
]}

Kulabako, R. N. ^{[3
]}

机构：

[1] Kungliga Tekn Hgsk, Dept Sustainable Dev Environm Sci & Engn, SE-10044 Stockholm, Sweden

[2] African Dev Bank, Water & Sanitat Dept, Tunis, Tunisia

[3] Makerere Univ, Coll Engn Design Art & Technol, Dept Civil & Environm Engn, Kampala, Uganda

来源：

WATER SCIENCE AND TECHNOLOGY | 2014年 / 69卷 / 11期

关键词：

biosorbents; cadmium; chemical treatment; chemisorption; kinetics; lead; HEAVY-METALS; ACTIVATED CARBONS; WASTE-WATER; REMOVAL; ADSORPTION; SORBENTS; BIOMASS; CD(II); PB(II);

D O I：

10.2166/wst.2014.147

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Untreated and chemically treated Albizia coriaria, Erythrina abyssinica and Musa spp. were studied in batch for uptake of Cd2+ and Pb2+ ions at pH 2.0-9.0 and agitation time of 30-390 min. Optimum biosorption conditions were pH 4 for Pb2+ ions and pH 5 for Cd2+ ions, contact time was 3.5 hours at 24 +/- 1 W C for 10 mg/L biosorbent dosage and initial metal ions concentration of 20 mg/L. Chemical treatment had a 10-17% biosorption efficiency enhancement for Cd2+ ions and a 1.6-2.3% reduction effect for Pb2+ ions. The sorption capacities for Cd2+ and Pb2+ ions for treated biosorbents were 1.760-1.738 mg g(-1) compared to 1.415-1.539 mg g(-1) for untreated materials. The pseudo second-order model suitably fitted the Cd2+ and Pb2+ ions biosorption data with regression coefficients (R-2) of 0.9784-0.9999. Fitting of the Ho model to the experimental data showed that the biosorption mechanism for both metal ions studied was mainly a chemisorption process. Therefore, treated A. coriaria, E. abyssinica and Musa spp. were potential biosorbents for remediation of Cd2+ ions and the untreated materials suitable for removing Pb2+ ions from contaminated aqueous media.

引用

页码：2230 / 2236

页数：7

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