皮克林乳液法制备ZIF-8@聚苯乙烯中空微球及其吸附阿莫西林性能

Preparation of ZIF-8@PS hollow microspheres by Pickering emulsion and adsorption performance on amoxicillin

研究采用ZIF-8纳米粒子稳定皮克林乳液,制备了ZIF-8@聚苯乙烯中空微球(ZIF-8@PS),并用于溶液中阿莫西林(AMOX)的吸附去除.用傅里叶变换红外光谱(FI-TR)、X射线衍射分析(XRD)、扫描电镜(SEM)和氮气吸附脱附(BET)等方法研究了ZIF-8@PS中空微球的理化性质.通过静态吸附实验结合吸附等温线模型和吸附动力学模型等考察了ZIF-8@PS对AMOX的性能.结果表明,ZIF-8@PS具有良好的中空多孔结构,比表面积为380.4 m2·g-1.pH值为7.0、308 K时有最佳吸附效果.ZIF-8@PS对AMOX的吸附过程用Langmuir模型和准一级动力学模型能更好地拟合,对AMOX的吸附倾向为单层吸附.308 K时Langmuir模型计算的最大吸附量为0.6232 mmol·g-1.材料具有良好的再生能力,经3次吸附-解吸附后吸附量约损失11.15%.

In this paper,The ZIF-8@polystyrene(ZIF-8@PS)hollow microspheres were prepared by Pickering emulsion polymerization with zeolitic imidazolate framework-8(ZIF-8)as stabilizer for oil-in-water emulsion,and were used for the adsorption removal of amoxicillin(AMOX)from aqueous solution.The physicochemical properties of ZIF-8@PS hollow microspheres were investigated by methods such as Fourier transform infrared spectroscopy,X-ray diffraction analysis,scanning electron microscopy,and Nitrogen adsorption-desorption.A series of static adsorption experiments and different adsorption isotherm models and kinetic models were used to analyze the AMOX adsorption performance on ZIF-8@PS.The results indicated that ZIF-8@PS possessed a good hollow porous structure,with a specific surface area of 380.4 m2·g-1.The best adsorption performance was obtained at pH 7.0 and 308 K.The AMOX adsorption on ZIF-8@PS could be better described by Langmuir model and the presudo-first-order kinetic model.The adsorption process tended to be monolayer adsorption.At 308 K,the maximum adsorption capacity calculated by Langmuir model reached 0.6232 mmol·g-1.ZIF-8@PS also exhibited excellent regeneration capacity with approximately 11.15%loss after three adsorption-desorption cycles.