林产化学与工业2011，Vol.31Issue(3)：50-54,5.
凹凸棒土吸附剂对单宁酸的吸附研究
Adsorption of Tannic Acid Using Palygorskite Adsorbent
摘要
Abstract
In this paper, the mechanism of adsorption of tannic acid using palygorskite were studied.The adsorption kinetics was studied based on the pseudo-frist order rate equation and the pseudo-second order equation.Thermodynamic parameters for the adsorption were determined usian the Van't Hoff equation.Studies found that sorption kinetics was described by a psudo-secondorder model.Both the rate constant and the initial adsorption rate firstly increased and then decreased with the increase of temperature However, the increasing of the initial concentration of tannic acid caused the decrease of the rate constant and the initial adsorption rate.The physicial adsorption of tannic acid on palygorskite was proposed.The process was exothermic with the decrease of the degree of freedom.The enthalpy value of adsorption of tannic acid on palygorskite adsorbent was about 20 kJ/mol.The adsorption of tannnic acid on palygorskite adsorbent was driven hy the collaboration of hydrogen bonding, electrostatic fore and hydropbebic interactions of tannic acid molecular with adsorben.In conclusion, the palygorskite adsorbent was useful for the adsorption of tannic acid due to large capacity for the adsorption of tannic acid.关键词
凹凸棒土吸附剂/单宁酸/吸附/动力学/热力学Key words
palygorskite adsorbent /tannic acid/ adsorption/ kinetics /thermodynamics分类
化学化工引用本文复制引用
黄健花,刘元法,宋志华,金青哲,王兴国..凹凸棒土吸附剂对单宁酸的吸附研究[J].林产化学与工业,2011,31(3):50-54,5.基金项目
江苏省凹土资源利用重点实验室开放研究基金资助项目(HPK200902) （HPK200902）
