Abstract In order to reduce the environmental impact of benzoic acid (BA), molecular imprinted polymers based on attapulgite were facilely prepared by molecular imprinted technique. The samples were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermal gravimetric analysis. The adsorption performance, regeneration stability, and competitive selectivity of BA by benzoic acid-surface molecular imprinted polymers (BA-MIP) were systematically investigated by experiments. For this material, it has a high adsorption capacity of 41 mg/g and an equilibrium adsorption time of about 150 min. Compared with non-imprinted polymers, BA-MIP has a higher adsorption capacity for BA, and the dynamic adsorption behavior of BA by both of them conforms to the quasi-second-order kinetic model. The Langmuir adsorption isotherm equation was fitted the isothermal adsorption experiment. The thermodynamic analysis shows that the adsorption process is an exothermic reaction. The adsorption capacity of BA first increases and then decreases with an increase in pH, and the maximum adsorption capacity is reached at pH = 5. BA-MIP also has excellent selective adsorption capacity and regeneration stability for BA.

中文翻译：

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凹凸棒石分子印迹聚合物的制备及其对水中苯甲酸的吸附性能评价

摘要为了减少苯甲酸（BA）对环境的影响，采用分子印迹技术制备了基于凹凸棒土的分子印迹聚合物。使用扫描电子显微镜、傅里叶变换红外光谱、X 射线衍射和热重分析对样品进行了表征。通过实验系统研究了苯甲酸表面分子印迹聚合物（BA-MIP）对BA的吸附性能、再生稳定性和竞争选择性。该材料的吸附容量高达41 mg/g，平衡吸附时间约为150 min。与非印迹聚合物相比，BA-MIP对BA具有更高的吸附容量，且两者对BA的动态吸附行为均符合准二级动力学模型。对等温吸附实验进行了Langmuir吸附等温方程的拟合。热力学分析表明吸附过程是一个放热反应。BA的吸附容量随着pH的增加先增大后减小，在pH=5时达到最大吸附容量。BA-MIP还对BA具有优异的选择性吸附能力和再生稳定性。