Effective removal of zinc ions from aqueous solutions using crab carapace biosorbent

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• 作者：Shuguang Lu ; Stuart W. Gibb ; Emma Cochrane
• 关键词：Biosorption ; Crab carapace ; Zinc ; Sequential-batch process ; Fixed-bed column
• 刊名：Journal of Hazardous Materials
• 出版年：2007
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：1 October 2007
• 卷：149
• 期：1
• 页码：208-217
• 文件大小：810 K

摘要

The carapace of the crab (Cancer pagurus), a waste material disposed of by the seafood industry, has recently been shown to have potential as a biosorbent for the removal of metals from aqueous media. Crab carapace in the particle size ranges 0.25–0.8 mm and 0.8–1.5 mm were used to investigate the effects of agitation speed, contact time, metal concentration and initial pH on the removal of Zn²⁺. In sequential-batch process Zn²⁺ uptakes of 105.6 and 67.6 mg/g were recorded for 0.25–0.8 mm and 0.8–1.5 mm particles, respectively, while values of 141.3 and 76.9 mg/g were recorded in fixed-bed column studies. Binary-metal studies showed that the presence of Cu²⁺ or Pb²⁺ significantly suppressed Zn²⁺ uptake. This study confirms that crab carapace may be considered a viable and cost-effective alternative to commercial activated carbon or ion-exchange resins for the removal of metals from aqueous media.