磁性UiO-66复合材料的合成及其对水体中硝基酚有机分子的吸附性能

Synthesis of Magnetic UiO-66 Composites for the Adsorption of Nitro Phenol Organic Molecules in Water

以溶剂热法制备了Fe_3O_4@SiO_2-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Fe_3O_4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Fe_3O_4@SiO_2-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 or-or interaction of phenyl ring between UIO-66 and 2-nitroresorcinol.