以二苯并噻吩为模板,4-乙烯基吡啶为功能单体,四钛酸钾晶须为载体,合成了对二苯并噻吩具有特异吸附的四钛酸钾表面分子印迹聚合物.采用红外光谱、扫描电镜、氮气吸附对其形貌和结构进行表征,利用气相色谱法研究其吸附性能.结果表明:在318 K,吸附时间为240 min时,吸附效果最佳.在初始浓度500 mg/L的二苯并噻吩溶液中平衡吸附量为23.33 mg/g;吸附过程符合.Pseudo-second-order动力学模型,以化学吸附为主;吸附行为符合 Freundich等温线方程,为多分子层吸附;吸附为自发、吸热、以熵驱动为主的过程.选择性吸附实验表明,四钛酸钾表面分子印迹聚合物对二苯并噻吩具有特异选择性.%A novel surface molecular imprinted material based on modification of potassium tetratitanate whisker has been successfully synthesized with dibenzothiophene(DBT) as template, 4-vinyl pyridine (4-VP) as functional monomer, potassium tetratitanate whisker (K2 Ti4 O9) as carrier. The synthetic sorbents were characterized by using the Fourier transform infrared spectroscopy, scanning electron microscopy and nitrogen adsorption. The adsorption conditions and properties of surfaceimprinted/K2Ti4O9 (MIP/K2Ti4O9) for selectivity of DBT were investigated. The experimental results showed that the optimum adsorption temperature was 318 K and adsorption time was 240 min.The equilibrium adsorption amount reached 23.33 mg/g at an initial concentration of 500 mg/L; the adsorption process was described well with pseudo-second-order model, the chemisorption was dominant and the adsorption behavior was explained well with the Freundich isotherm equation, so it was a multi-molecular layer adsorption; the adsorption of DBT onto MIP/K2Ti4O9was a spontaneous,endothermic and entropy-driven process. Selective adsorption test indicated that the MIP/K2Ti4O9 was a more effective sorbent than non-imprinted/K2Ti4O9 (NIP/K2Ti4O9) toward DBT.
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