基于MOFs的复合材料制备及其对亚甲基蓝染料的吸附性能

Fabrication of Composite Material Based on MOFs and its Adsorption Properties for Methylene Blue Dyes

用甲基丙烯酸酐对锆基MOFs UiO-66-NH_(2)进行改性,然后用紫外光固化将改性后的MOFs UiO-66-NH_(2)负载于聚丙烯(PP)非织造布制备出MOFs与非织造布(PSP)复合材料。分析了改性前后UiO-66-NH_(2)的晶型和形貌变化并测试了MOFs(UiO-66-NH_(2)-MET)与PP非织造布的结合牢度,测试了吸附条件对PSP复合材料吸附性能的影响。结果表明:通过在UiO-66-NH_(2)结构中修饰甲基丙烯酸酐基团制备出UiO-66-NH_(2)-MET,改性后MOFs的晶型结构没有变化,保留了原有的框架结构;UiO-66-NH_(2)-MET与PP非织造布间有良好的结合牢度。PSP复合材料经历多次水洗后未发生质量损失,保留了良好的吸附效果;PSP复合材料吸附亚甲基蓝(MB)的最佳条件为:染料的初始浓度为50 mg/L,吸附时间为300 min,pH值为9。

Zr-based metal-organic frameworks(MOFs)UIO-66-NH_(2) was modified with methacrylate anhydride,and then the modified MOFs were deposited onto polypropylene(PP)nonwoven fabric while real-time curing assisted by UV irradiation to prepare composite of MOFS/nonwoven fabric(PSP).The changes of crystal form and morphology of UIO-66-NH_(2) before and after modification were analyzed,and the binding fastness of MOFs(UIO-66-NH_(2)-MET)to PP nonwovens was examined,and the effect of adsorption conditions on the adsorption properties of PSP composite was investigated.The results show that UIO-66-NH_(2)-MET could be prepared through modifying the UIO-66-NH_(2) structure with methacrylate anhydride group.After modification,the crystal structure of MOFs remained unchanged and the original frame structure was retained.UIO-66-NH_(2)-MET has good fastness on PP nonwovens.No mass loss occurred after repeated washing,and the PSP composite retained good adsorption effect.The optimum conditions for PSP composites to adsorb methylene blue(MB)are as follows:The initial concentration of the dye was 50 mg/L,the adsorption time was 300 min,and the pH value was 9.