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《Environmental Science & Technology》 2017-02
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Biosorption Function of Zinc (Zn~(2+)) in Water by Four Kinds of Immobilized Edible Mushroom Residues

LI Xia;ZHANG Dan;SHEN Fei;QING Hui;YANG Yang;Institute of Mountain Hazards and Environment,Chinese Academy of Sciences and Ministry of Water Conservancy;Hydrogeology and Engineering Geological Team NO.909,Sichuan Geology and Mining Development Bureau;University of Chinese Academy of Sciences;Yibin Branch Company,Sichuan Tobacco Company;  
To develop biosorption function of edible mushroom residue for Zn~(2+) removal from water,polyvinyl alcohol-Naalginate(PVA-SA) was used to immobilise Flammulina velutipes,Auricularia polytricha,Pleurotus eryngii and Pleurotus ostreatus residues for making adsorbents respectively.The concentration of Zn~(2+) was tested by using such instrument as inductively coupled plasma optical emission spectrometry(ICP-OES).The effects of initial pH value and contact time on the Zn~(2+) removing behavior were investigated.The results showed that the process for adsorption of Zn~(2+) can be basically finished in 120 min with suitable pH value 6.0.The maximum biosorption ratio of immobilized F.velutipes,A.polytricha,P.eryngii and P.ostreatus residue were 72.34%,69.22%,39.70% and 55.25%,respectively.We compared the pseudo-first-order kinetics,the pseudo-second-order kinetics,Elovich and intraparticle diffusion kinetics model to present the biosorption of Zn~(2+) by four adsorbents,it was proved that the pseudo-second-order kinetics is the best suitable model for characterizing the biosorption process of Zn~(2+),chemisorption were the rate-limiting step of adsorption process.Langmuir isotherm model fitted well with the adsorption process of F.velutipes,A.polytricha,P.eryngii and P.ostreatus residues with the correlation value R~2 of 0.988 2,0.988 9,0.962 4 and 0.991 3,respectively,indicating the monolayer adsorption was dominate.Scanning electron microscopy(SEM) of F.velutipes exhibited broken cell and thickened cell wall,indicating that the molecular rearrangement and cells swell play an important role in Zn~(2+) biosroption process.Zn~(2+) in the water could be efficiently removed by F.velutipes residue with removal ratio of 66.67%,which was efficient in the adsorption of low concentration Zn~(2+).
【Fund】: 国家自然科学基金资助项目(41571315);; 中国科学院仪器设备功能开发技术创新项目(Y6K2200200)
【CateGory Index】: X703.1
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