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《Journal of Instrumental Analysis》 2010-12
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Application of Attapulgite to Adsorption of Heavy Metal Ions

KONG Yong1,WANG Zhi-liang2,NI Jun-hua1,SUN Tao1,CHEN Zhi-dong1(1.School of Chemistry and Chemical Engineering,Changzhou University,Changzhou 213164,China;2.Key Laboratory of Environment Engineering of Jiangsu Province,Jiangsu Provincial Academy of Environmental Science,Nanjing 210036,China)  
Attapulgite is a crystalline hydrated magnesium silicate with fibrous morphology,large specific surface area and moderate cationic exchange capacity.In this paper,the adsorption capacity of attapulgite to heavy metal ions,viz.Cu(Ⅱ),Cd(Ⅱ),Ni(Ⅱ) and Cr(Ⅵ) were studied in detail.The results showed that by adding 0.05 g attapulgite to each of the heavy metal ion solutions(500 mg·L-1)at ambient temperature,the adsorption capacities for Cu(Ⅱ),Cd(Ⅱ),Ni(Ⅱ) and Cr(Ⅵ) were 99,56,117,198 mg·g-1,respectively.The attapulgite was characterized by scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR) and adsorption-desorption isotherms,respectively.In addition,the mechanisms of the adsorption were also discussed.It was found that the main adsorption mechanisms of the heavy metal ions on attapulgite were complexion,ion exchange and electrostatic attraction.This study demonstrated that the application of attapulgite to the removal of heavy metal ions from industrial wastewater was feasible and cost-effective.
【Fund】: 江苏省自然科学基金资助项目(BK2008542 BK2009537);; 江苏省环境工程重点实验室开放基金资助项目(KF2010003);; 常州市科技计划项目(CQ20100004)
【CateGory Index】: X703
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