改性UIO-66对高浓度Cr(VI)的吸附

Adsorption of High Concentration Cr(VI)by Modified UIO-66

本文采用溶剂热法制备了UIO-66、UIO-66-NH_(2)、UIO-66-Br、UIO-66-(OH)_(2)、UIO-66-(COOH)_(2),考察了这五种材料对模拟皮革废水中Cr^(6+)的吸附效果,结果表明UIO-66对Cr^(6+)的吸附率最高为75.15%。为提高UIO-66的吸附性能,采用掺杂金属的方法对其进行改性,制备了掺Cu、Co、Ni、Mg、Ag(摩尔比为5%)的UIO-66系列材料,通过实验得出在pH值为2,初始投加量为1.5 g/L,室温条件下吸附40 min时,UIO-66-5%Mg对Cr^(6+)的吸附率最高可达92.91%,与UIO-66相比,吸附效率提高了17.76%。与文献报道的吸附材料相比,其对Cr^(6+)具备更加优良的吸附效果。采用XRD、SEM和XPS对两者进行表征,表征结果证明改性前后晶体结构基本一致,结晶良好,改性后材料的吸附性能有很大的提高。

In this paper,UIO-66,UIO-66-NH_(2),UIO-66-Br,UIO-66-(OH)_(2)and UIO-66-(COOH)_(2)were prepared by solvothermal method.The adsorption effect of these five materials on Cr^(6+)in simulated leather wastewater was investigated.The results showed that the highest adsorption rate of Cr^(6+)by UIO-66 was 75.15%.In order to improve the adsorption performance of UIO-66,metal doping method was used to modify it,and the UIO-66 series materials doped with Cu,Co,Ni,Mg and Ag(mole ratio of 5%)were prepared.The results showed that the highest adsorption rate of Cr^(6+)by UIO-66-5%Mg was 92.91% when pH was 2,initial dosage was 1.5g/L and adsorption time was 40 min at room temperature.Compared with UIO-66,the adsorption efficiency increased by 17.76%.Compared with the adsorption materials reported in the literature,it has better adsorption effect on Cr^(6+).XRD,SEM and XPS were used to characterize the two.The characterization results proved that the crystal structure before and after the modification was basically the same,the crystallization was good,and the adsorption performance of the modified material was greatly improved.