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《Environmental Science》 2009-09
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Adsorption of Pb~(2+) onto Chitosan-Grafted-Poly (Acrylic Acid)/Sepiolite Composite

ZHENG Yi-an~1,XIE Yun-tao~(1,2),WANG Ai-qin~1(1.Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
A composite adsorbent chitosan-grafted-poly(acrylic acid)/sepiolite was prepared,and its pH-dependence for removing Pb~(2+),as well as adsorption isotherm and kinetics were estimated.The results indicate that poly(acrylic acid) has been grafted onto the backbone of chitosan,forming an organic-inorganic composite adsorbent.As-prepared adsorbent shows a coarse,porous and accidented surface,which can contribute to its adsorption kinetics.Under the conditions of pH 6.00,contact time of 30 min,initial Pb~(2+) concentration of 0.02(mol·L~(-1)) and amount of adsorbent of 0.10 g,the adsorption capacity of developed adsorbent for Pb~(2+)is found to be 638.9(mg·g~(-1)),about three times than that of sepiolite.When five cycles of adsorption-desorption process were carried out,the adsorption capacity decreased to 489.2(mg·g~(-1)),76.6% to its original adsorption capacity.However,when sepiolite was used as the adsorbent,no sorption can be observed after three cycles of adsorption-desorption process.Compared to sepiolite,this composite adsorbent presents higher adsorption capacity,faster adsorption rate and better reusable ability.
【Fund】: 国家自然科学基金项目(20877077);; 甘肃省科技支撑项目(0804GKCA03A)
【CateGory Index】: X703.1
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