Synthesis, characterization and catalytic degradation of dye wastewater of Cd-based MOFs materials

Industrial wastewater treatment is of great significance for maintaining ecological balance and achieving sustainable development. Developing new removal agents with the feature of catalytic degradation of pollutants is an effective solution to the wastewater treatment. To address this, metal-organic frameworks (MOFs) with inherent characteristics of wide material sources and adjustable structures were proposed and demonstrated according to the principle of crystal engineering. Therefore, a MOF of [Cd (bpt)(H₂O)₄]_n·n(pam) ·2nH₂O (MOF-1) was prepared by using pamoic acid (H₂pm) and 2,5-bis (4-pyridyl) -1,3,4-thiadiazole (bpt) as components. The structural analysis and physico-chemical characterization showed that MOF-1possessed complex supramolecular network with one-dimensional covalent chain, the simple synthesis method, good product quality, and the uniform morphology with the size of about 0.5~2 μm. The main framework of MOF-1 was thermostable till 310 ℃. The crystal products owned excellent chemical stability of not less than 60 days and 163 days in strong acid and neutral aqueous solution, respectively. Moreover, MOF-1 displayed bright green fluorescence and could be used as a molecular luminescence thermometer over a wide temperature range. The catalytic degradation of organic dyes performed by MOF-1 in simulated industrial wastewater revealed that the materials had a narrow bandgap width Eg=2.85 eV and a large decolorization rate of Rhodamine B with 85.94%. Hence, MOF-1 is a brilliant wastewater treatment agent with greater comparative advantages with lots of known materials.