Synthesis of Novel MOF-Based BixTiy-BTC and Bi1Ti3-BTC/Fe3O4 Photocatalysts and Their Application in the Degradation of UDMH in Wastewater
Graphical A series of novel MOFs based Bi x Ti y -BTC photocatalysts synthesized by the hydrothermal method for removal of UDMH from wastewater. The interconversion between Ti 3+ and Ti 4+ in Bi 1 Ti 3 -BTC promotes quick electrons transfer. And nano-Fe 3 O 4 prevented agglomeration of Bi 1 Ti 3 -BTC and improved photocatalytic activity, the optimal catalytic degradation performance of 97.02 % was observed at a Bi : Ti molar ratio of 1 : 3. Removal of organic pollutants from wastewater remains a significant challenge. Hence, we report a series of novel MOFs based Bi x Ti y -BTC photocatalysts synthesized by hydrothermal method for decontamination of 1,1-Dimethylhydrazine (UDMH). The preparation parameters of MOFs were optimized, the best catalytic performance was achieved by adjusting the Bi/Ti molar ratio to 1 : 3, with Bi 1 Ti 3 -BTC a photocurrent density of 0.35 mA/cm 2 was reached. The morphology and composition of the materials were analyzed, titanium doping increased the specific surface area. Bi 1 Ti 3 -BTC was loaded with magnetic nano-Fe 3 O 4 , which prevented agglomeration of Bi 1 Ti 3 -BTC and increased the specific surface area, thus improving photocatalytic activity. The band gap structure of the semiconductor materials was estimated by UV-Vis and XPS valence band spectra, while the separation efficiency of photogenerated carriers was investigated by photocurrent density and PL (Photoluminescence) spectrum. The photocatalytic degradation rate of UDMH rapidly decreased after addition of EDTA, indicating that h + was the main active species in the photocatalytic degradation process. The photocatalytic removal efficiency of UDMH with Bi 1 Ti 3 -BTC/Fe 3 O 4 at a concentration of 0.5 g/L reached 97.58 % after illumination for 180 min, and after 210 min near quantitative degradation was observed.
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