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Adsorption of copper to different biogenic oyster shell structures

信息来源:暂无 发布时间:2014-08-23

Qiong  Wu,Jie  Chen, Malcolm  Clark, Yan  Yu 

Abstract

The removal of copper from solution by oyster shell powder was investigated for potential wastewater treatment uses.In particular,adsorption behavior differences between the prismatic (PP) and nacreous (NP) shell layers, and how this affects copper removal, were investigated.Experimental results indicated that copper adsorption was highly pH-dependent with optimal copper removal at pH 5.5, where the powdered whole raw shell (RP)removed up to 99.9% of the copper within 24h at a 10mg/L initial copper concentration.Langmuir and Freundlich models were used to analyze  the isotherm PP, NP and RP data.These results showed a strong homogeneou Langmuir model for low initial copper concentration (5–30mg/L) to both RP and PP layer,while strong agreement with a heterogeneous Freundlich model for high initial copper concentrations (30–200  mg/L);nevertheless,a homogeneous Langmuir model provided the best fit for the more dense NP layer across the initial concentration range (5–200mg/L).The distribution coefficient (Kd) value of PP layer for each initial concentration investigated was substantially higher than the NP layer and it was also found that the PP layer dominated the adsorption process with an adsorption capacity of 8.9mg/g,while the adsorption capacity of the NP layer was 2.6mg/g.These differences are believed to be because of the more porous structure of the PP layer,which was confirmed by scanning electron microscopy,infrared spectroscopy,energy-dispersive X-ray spectroscopy,and thermogravimetry–differential thermal analyses.

Keywords

Adsorption;Copper ion;Oyster shell;Prismatic layer;Nacreous laye

 

附件:Adsorption  of  copper  to  different  biogenic  oyster  shell  structures