污水处理用介孔结构MIL-101(Cr)-125Ti的制备及其BPA吸附研究

Preparation of mesoporous MIL-101(Cr)-125Ti for wastewater treatment and analysis on its adsorption to BPA

选择Cr(NO_(3))_(3)·9H_(2)O与对苯二甲酸为原料,通过溶剂热处理方法制备得到MIL-101(Cr)及MIL-101(Cr)-125Ti,利用SEM、TEM、XRD等对其形貌和结构进行表征,对比了不同吸附剂添加量、溶液pH及温度参数引起的MIL-101(Cr)-125Ti吸附能力变化。结果表明,相对于MIL-101(Cr),MIL-101(Cr)-125Ti粒径尺寸显著增大,可以获得对BPA的更强吸附能力;MIL-101(Cr)-125Ti中同时形成了结晶相与非晶相两种组织形态;MIL-101(Cr)-125Ti大部分孔径接近6.1 nm,说明MIL-101(Cr)-125Ti属于一种介孔结构;MIL-101(Cr)的比表面积更小,形成了更大的孔径。经过对BPA去除率的影响试验结果确定了最优的参数:吸附剂质量浓度为0.75 mg/mL、溶液pH为5、溶液温度为35℃。

Cr(NO_(3))_(3)·9H_(2)O and terephthalic acid are used as raw materials to obtain MEL-101(Cr)and MEL-101(Cr)-125Ti both with mesoporous structure by solvent heat treatment method.Their morphology and structure are characterized by SEM,TEM,XRD,etc.Changes in adsorption capacity of MEL-101(Cr)-125Ti caused by different adsorbents,solution and temperature parameters are compared.It is shown that compared with MIL-101(Cr),MIL-101(Cr)-125Ti has a much larger particle size,which represents a stronger adsorption capacity for bisphenol A(BPA).Both crystalline and amorphous phases are formed within MIL-101(Cr)-125Ti.Most of the pore of MIL-101(Cr)-125Ti approaches 6.1 nm,indicating that MIL-101(Cr)-125Ti has a mesoporous structure.MIL-101(Cr)has smaller specific surface area and a larger pore size.Through evaluating the influencing factors on the removal rate of BPA,the optimal parameters are determined as follows:the concentration of adsorbent is 0.75 mg·mL^(-1),the pH value of solution is 5,and the solution temperature remains at 35℃.