Two isomorphic rare earth metal-organic framework materials (MOFs),Er-NH2-TPTC and Ho-NH2-TPTC,were obtained by the reaction of aminated 3,3′,5,5′-tribiphenyl tetracarboxylic acid (NH2-H4TPTC) as ligands with rare earth metal salts [Ho(NO3)3·6H2O and Er(NO3)3·6H2O].The two MOFs had good stability below 250℃.Different types of ionic dyes were selected,and the adsorption as well as photocatalytic degradation of the organic dyes were carried out with the synthesized materials.The results showed that Er-NH2-TPTC and Ho-NH2-TPTC exhibited better adsorption effects for ionic dyes than neutral dyes,and the degradation effects of various organic dyes were improved after photocatalysis.Due to the influence of dye molecular size,the removal efficiency of two isomorphic rare earth MOFs for small molecule cationic dye methyl blue could reach 99%,while the degradation efficiencies for larger cationic dye Rhodamine B were the lowest,reaching only 47% and 73%,respectively.The mechanistic studies of photocatalytic degradation revealed that ·O-2 and ·OH active substances were produced during the process of degradation,and the generation of such radicals was helpful to improve the photocatalytic degradation efficiency.
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基金资助
国家自然科学基金(12175024)
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