基于吩嗪基团修饰的Al-MOF材料吸附亚甲基蓝及性能

Adsorption and properties of methylene blue by Al-MOF materials modified with phenazine groups

传统NH_(2)-MIL-101(Al)材料由于可循环性能差,难以高效吸附有机染料。利用2,3-二氨基吩嗪与2,4-二甲基-5-醛基-1H-吡咯-3-羧酸的反应产物,对NH_(2)-MIL-101(Al)材料进行后修饰,制备得到了1-MOF材料。该材料尤其可用于有机染料亚甲基蓝(MB)的吸附,最大吸附量高达146.82mg/g。最佳吸附溶液为中性,对共存的离子具有抗干扰性,循环5次后依然具有高于80%的去除率,显著提高了传统NH_(2)-MIL-101(Al)材料的循环利用性。动力学模型和热力学模型证实该吸附过程更符合准二级动力学模型和Langmuir等温线模型。

Traditional NH_(2)-MIL-101(Al)material is difficult to adsorb organic dyes efficiently because of its poor recyclability.Using the reaction product of 2,3-diaminophenazine and 2,4-dimethyl-5-aldehyde-1H-pyrrole-3-carboxylic acid,NH_(2)-MIL-101(Al)material was post-modified to prepare 1-MOF material.This material could be especially suitable for the adsorption of organic dye methylene blue(MB),with the maximum adsorption capacity as high as 146.82mg/g.The optimal adsorption solution was neutral,and the adsorption process had anti-interference to co-existing ions.Moreover,it still had a removal rate of more than 80%after 5 cycles,which significantly improved the recyclability of traditional NH_(2)-MIL-101(Al)materials.The kinetic and thermodynamic experiments confirmed that the adsorption process was more in line with the quasi-second-order kinetic model and Langmuir isotherm model.