改性凹凸棒土表面印迹聚合物对4-氯酚吸附行为研究

Adsorption behaviours of 4-chlorophenol(4-CP) on modified attapulgite surface imprinted polymer

以聚苯胺/凹凸棒土复合材料(PAS)作为支架,合成了表面分子印迹聚合物(M IPs)和非印迹聚合物(NIPs),用于吸附水环境中的4-氯酚(4-CP)。实验用SEM和氮气吸附-解吸附分析对聚合物进行表征,探讨了pH、溶液中醇含量、静置时间和温度对吸附行为的影响。通过一级吸附动力学方程和二级吸附动力学方程研究了吸附剂分别在25、35和45℃时的吸附动力学性能。通过Langmu ir和Freund lich等温线模型拟合发现,M IPs和NIPs在常温时的单分子层饱和吸附容量分别为48.05 mg/g和32.60 mg/g。

Based on polyaniline/attapulgite composites（PAS） as support,the surface imprinted polymers（MIPs） and non-imprinted polymers（NIPs） were synthesized for the adsorption of 4-chlorophenol（4-CP） from aquatic environment.The MIPs and NIPs was charcterized by FTIR spectroscopy and nitrogen adsorption-desorption analysis.The effects of pH,the volume percent of methanol,contact time and temperature of medium on the adsorption were studied.Kinetic data were described by the pseudo-first-order model,pseudo-second-order model at 25 ℃,35 ℃ and 45 ℃ respectively.Equilibrium data were described by the Langmuir and Freundlich isotherm model at normal temperature,moreover,the maximum adsorption capacity was 48.05 mg/g for MIPs and 32.60 mg/g for NIPs.