Kinetics of adsorption of Zn~(2+) on imprinted chitosan polymer
HONG Ying1,ZHONG Zehui1,GUO Bin 2(1Hunan University of Technology,Zhuzhou 412008,Hunan,China;2Key Laboratory of Chemical Biology and TCM Research of Ministry of Education,Hunan Normal University,Changsha 410081,Hunan,China)
Zn2+ was used as template with paraffin as dispersant agent,formaldehyde as pre-crosslinking agent,and epichlorohydrin as crosslinking agent to prepare a imprinted chitosan polymer.The structure of the polymer was characterized by X ray diffractometer(XRD).The dosage of the polymer and the influence of temperature on the adsorption of Zn2+ were studied.Studies on the kinetics of the adsorption of Zn2+ by the imprinted polymer and the isothermal adsorption properties were also performed.The result showed that the regularity of the chitosan crystals was broken in the preparation of the imprinted polymer,adding a large amount of coordination group which enlarged adsorption capacity.Meanwhile the polymer acquired a highly selective adsorption capacity to Zn2+,and the separation factor of Zn2+,Cd2+,Mg2+,Mn2+ were all greater than 1.5.The imprinted polymer adsorbed the Zn2+ rapidly,and the whole adsorption process fitted the pseudo-second-order kinetic model well,t/Qt=8.1744+2.0186t and the correlation coefficient was 0.998.The calculated equilibrium adsorption capacity was satisfactory compared with the experiment data.The adsorption process at a constant temperature fitted the Langmuir equation of isothermal adsorption:Ce/Qe=1.3297+0.02701Ce and the maximum adsorption capacity was 37.023 mmol/g.The adsorption mainly proceeded in the form of monolayer.
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<author>o Minjie, Liu Zhen, LI Mei
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