Preparation method and application of catalytic material for visible light efficient degradation of enoxacin
A catalytic material, enoxacin technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low light utilization rate and easy recombination of photogenerated carriers, and achieve no Effects of noble metal doping, wide range of raw materials, and low production cost
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Embodiment 1
[0016] g-C 3 N 4 / FeNi / P preparation method
[0017] Preparation of modified CN: 5 g of melamine and 5 g of cyanuric acid were dispersed in 50 mL of deionized water, the mixed solution was stirred until uniform, then dried in an oven at 60 °C, and placed in a tube furnace under N 2 It was calcined under the atmosphere for a reaction time of 4 h. After the reaction was completed, it was cooled to room temperature, washed three times with deionized water and ethanol alternately, and dried at 60 °C to obtain modified g-C. 3 N 4 . The calcination temperature was 450, 500, 550 and 600 °C, respectively, and a series of modified g-C were obtained. 3 N 4 , named as modified CN-450, modified CN-500, modified CN-550 and modified CN-600. Through the characterization of morphology, structure and optical properties, it is found that the modified CN-550 has the largest specific surface area, and the morphology is a hollow coral-like structure with a large number of holes on the surfac...
Embodiment 2
[0021] Enoxacin degradation test: Weigh 0.02 g of prepared g-C 3 N 4 / FeNi / P catalyst, added to a photocatalytic reactor containing 100 mL of enoxacin (initial concentration of 20 mg / L). Before the photoreaction, it was stirred in the dark for 30 min to reach the adsorption equilibrium. Then, the degradation test was carried out under the condition of visible light, the reaction was performed for 40 min, the reaction temperature was 25 °C, the reaction solution was taken every 10 min, and the test sample was obtained after filtering with a 0.22 μm filter membrane.
[0022] The concentration of target pollutants was determined by ultra-high performance liquid chromatography. The results showed that the degradation efficiency of enoxacin could reach 99.9% and the mineralization rate could reach 50% at 40 min.
[0023] Degradation test comparison: pure modified CN-550, g-C3N4 prepared by traditional method and Ag / AgCl@ZIF-8 / g-C with excellent performance in previous studies 3 ...
Embodiment 3
[0025] Free radical quenching test: using p-benzoquinone (BQ), EDTA-2Na, L-histidine, tert-butanol (TBA), AgNO 3 as superoxide radicals (·O 2 - ), holes (h + ), singlet oxygen (1O 2 ), hydroxyl radicals ( OH), electrons (e - ), 1 mM quencher was added to a photocatalytic reactor containing 100 mL of enoxacin (initial concentration of 20 mg / L) together with 0.02 g of the prepared composite catalyst. Before the light reaction, it was stirred under dark conditions for 30 min to reach adsorption equilibrium. Then, the degradation test was carried out under the condition of visible light, the reaction was performed for 40 min, the reaction temperature was 25 °C, the reaction solution was taken every 10 min, and the test sample was obtained after filtering with a 0.22 μm filter membrane. The effects of various free radicals were compared by testing the change of the degradation efficiency of enoxacin before and after adding the quencher.
[0026] When AgNO is added to the phot...
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