以溶剂热法制备了Fe3O4@SiO2-PSS@UiO-66结构的磁性多孔复合材料,并利用XRD,TEM,SEM,IR,TG,VSM和N2吸附-脱附对样品的结构和形貌进行测试表征.研究结果表明:磁性UiO-66复合材料是以球型Fe3O4为核,MOF为壳的核-壳结构,其表面的MOF层由多个立方多晶堆积组装而成,且具有良好的超顺磁性.进一步研究了Fe3O4@SiO2-PSS@UiO-66对2-硝基-1,3-苯二酚的吸附性能.探讨了吸附时间,吸附量和2-硝基-1,3-苯二酚初始浓度在吸附过程中的影响,结果表明:当吸附时间为12h,吸附剂的用量为5 mg,2-硝基-1,3-苯二酚浓度为400 mg·L-1时,最大吸附量为161.36 mg·g-1.另外,磁性UiO-66复合材料对2-硝基-1,3-苯二酚高的吸附性能可能是由于UiO-66与2-硝基-1,3-苯二酚之间的静电作用以及二者之间苯环的π-π作用.%Magnetic porous composites of Fe3O4@SiO2-PSS@UiO-66 were prepared by hydrothermal method.The microstructure and morphology was characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),scanning electron microscope (SEM),infrared (IR),thermogravimetric analysis (TG),vibrating sample magnetometer (VSM) and N2 adsorption-desorption.The results show that magnetic UiO-66 composites are a core shell structure with spherical Fe3O4 as core and cubic MOF as shell.The composites show good superparamagnetism.The adsorption performance of 2-nitroresorcinolon Fe3O4@SiO2-PSS@UiO-66 was further studied.And the effects of contact time,adsorbent dose and initial 2-nitroresorcinol concentration on the adsorption process were explored.The results show that the maximum adsorption capacity is 161.36 mg ·g-1 in following experimental conditions:contact time is 120 min,adsorbent dose is 5 mg,initial 2-nitroresorcinol concentration is 400 mg· L-1.In addition,the higher adsorption efficiency of 2-nitroresorcinol on magnetic UiO-66 composites may be due to the electrostatic interaction and π-π interaction of phenyl ring between UiO-66 and 2-nitroresorcinol.
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