摘要
通过溶剂热法制备金属有机骨架材料(MOFs)MIL-101(Fe)和MIL-101(Fe)-NH_2,并通过X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电镜(SEM)进行表征。以水中的亚硝酸盐氮(NO_2~--N)为目标物,研究2种材料对其的吸附作用。结果表明,2种材料对NO_2~--N的吸附符合准二级动力学和Langmuir等温吸附模型,吸附平衡时间为5 h。由于氨基的存在,MIL-101(Fe)-NH_2的吸附能力略优于MIL-101(Fe)。
The metal organic frameworks(MOFs) materials,MIL-101(Fe) and MIL-101(Fe)-NH_2,were prepared by the solvothermal method and characterized by XRD,FT-IR,and SEM. Then the adsorption effects of the MIL-101(Fe)and MIL-101(Fe)-NH_2 on nitrite nitrogen were investigated. The results show that the adsorption kinetics of these two materials accords with the pseudo-second-order kinetics and Langmuir isotherm model. Besides,the time for adsorption equilibrium of nitrite nitrogen is 5 h. The adsorption capacity of MIL-101(Fe)-NH_2 is slightly better than MIL-101(Fe) due to the presence of amidogen.
引文
[1]邱舜钿，宋碧君，何珊丽，等．散装酱腌菜总砷、铅及亚硝酸盐含量的安全性评价[J]．广东农业科学，2009(3):161-163.
[2]郑茜，周秋红，何靖，等.无烟煤去除水中亚硝酸盐氮的机理研究[J].环境工程学报2017,11(1):127-135.
[3]张爱丽，刘玥，周集体，等.壳聚糖复合树脂对亚硝酸盐氮的吸附性能[J].环境科学，2009,30(2):463-468.
[4] Ockwign W,O’Keefee M,YaghioM,et al. Reticular chemistry:occurrence and taxonomy of nets and grammar for the design of frameworks[J]. Acc. Chem. Res.,2005,38(3):176-182.
[5] Han Y J,Zhai J F,Zhang L L,et al. Direct carbonization of cobaltdoped NH2-MIL-53(Fe)for electrocatalysis of oxygen evolution reaction[J]. Nanoscale,2016,8(2):1033-1039.
[6] Liang Q,Zhang M,Zhang Z H,et al. Zinc phthalocyanine coupled with UiO-66(NH2)via a facile condensation process for enhanced visible-light-driven photocatalysis[J]. J. Alloys. Compd.,2017,690:123-130.
[7] Chen C,Zhang M,Guan Q,et al. Kinetic and thermodynamic studies on the adsorption of xylenol orange onto MIL-101(Cr)[J]. Chemical Engineering Journal,2012,183(8):60-67.
[8] Zhang Z G,Li X Y,Liu B J,et al. Hexagonal microspindle of NH2-MIL-101(Fe)metal-organic frameworks with visible-lightinduced photocatalytic activity for the degradation of toluene[J]. RSC Adv.,2016(6):4289-4295.
[9] Hong D Y,Hwang Y K,Serre C,et al. Porous chromium terephthalate MIL-101 with coordinatively unsaturated sites:surface functionalization,encapsulation,sorption and catalysis[J]. Advanced Functional Materials,2009,19(10):1537-1552.
