PDM/Fe共改性膨润土的优化制备及表征  

Optimized preparation and characterization of PDM/Fe co-modified bentonite clay

作　　者：马俐琪 王烨 杨柳[1,2] 刘思雨 韩枫[1,2] MA Liqi;WANG Ye;YANG Liu;LIU Siyu;HAN Feng(College of Water Resources and Environment,Chang’an University,Xi’an 710054,China;Key Laboratory of Underground Hydrology and Ecological Effects in Arid Zone,Chang’an University,Ministry of Education,Xi’an 710054,China)

机构地区：[1]长安大学水利与环境学院,陕西西安710054 [2]长安大学旱区地下水文与生态效应教育部重点实验室,陕西西安710054

出　　处：《应用化工》2025年第2期336-340,共5页Applied Chemical Industry

基　　金：陕西省科技计划项目重点研发计划项目(2020SF-422)。

摘　　要：探究了聚二甲基二烯丙基氯化铵(PDM)改性磁性膨润土(PDB)的最佳制备工艺条件及其对微塑料的吸附。以FeCl_(2)·4H_(2)O、FeCl_(3)·6H_(2)O和PDM为改性剂制备PDB,以对聚苯乙烯微塑料(PS-MP)吸附率为评价指标,通过Box-Behnken试验设计对制备温度、时间以及磁性膨润土与PDM固液比进行优化,获得PDB最佳制备工艺条件。并通过扫描电子显微镜(SEM)、比表面积及其孔隙度分析(BET)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)等技术对材料进行表征,揭示PDB吸附前后形貌与结构。结果表明PDB最佳制备工艺条件为固液比1∶18,温度22.6℃,时间214 min,对微塑料的吸附率影响大小为:固液比>温度>时间。通过二次多项回归拟合所建立了吸附率与工艺条件关系回归方程,方程F值为198.73,P值<0.0001,差异极显著,方程拟合相关系数R 2=0.9961,该模型方程能很好地预测试验结果。最优工艺条件重复试验对PS-MP最大吸附率为97.02%,与模型方程预测的99.16%接近,该模型方程具有较高的可靠性。PDB吸附PS-MP前后表征均表明PS-MP成功吸附到PDB表面及孔隙。PDB的优化制备为污水处理系统中微塑料的去除提供了一种新材料和方法。The preparation process conditions for poly(dimethyldiallylammonium chloride)(PDM)modified magnetic bentonite(PDB)and its adsorption capabilities on microplastics were investigated.FeCl_(2)·4H_(2)O,FeCl_(3)·6H_(2)O,and PDM were employed as modifiers in the preparation of PDB.The adsorption rate on polystyrene microplastics(PS-MP)served as the evaluation index.The preparation temperature,time,and the solid-liquid ratio of magnetic bentonite to PDM were optimized using Box-Behnken experimental design to establish the conditions for PDB preparation.The materials were characterized through scanning electron microscopy(SEM),specific surface area and porosity analysis(BET),Fourier-transform infrared spectroscopy(FTIR),and X-ray diffraction(XRD)to elucidate the morphology and structure of the materials before and after PDB adsorption.The results indicated that the optimal process conditions for PDB preparation were solid-liquid ratio is 1∶18,temperature is 22.6℃,and time is 214 min.The influence on the adsorption rate of microplastics was as follows:solid-liquid ratio>temperature>time.A regression equation correlating the adsorption rate with the process conditions was established through quadratic multinomial regression fitting,F-value is 198.73 and P-value<0.0001,indicating a highly significant difference.The correlation coefficient for the fitted equation was R 2=0.9961,demonstrating that the modeling equation accurately predicted the experimental results.The maximum adsorption rate of PS-MP,achieved through repeated tests under optimal conditions,was 97.02%,closely approximating the 99.16%predicted by the model equation,thereby confirming its reliability.Characterization of PDB before and after PS-MP adsorption revealed successful adsorption onto the surface and within the pores of PDB.The optimal preparation of PDB represents a promising new material for the removal of microplastics in wastewater treatment systems.

关 键 词：聚二甲基二烯丙基氯化铵 FE 膨润土 微塑料 吸附 

分 类 号：TQ424[化学工程]