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

Pending Publication Date: 2022-07-22
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Against current limitations g-C 3 N 4 Low light utilization efficiency and easy recombination of photogenerated carriers in the application and development of based photocatalytic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the technical field of environmental pollution control engineering, and provides a preparation method and application of a catalytic material for visible light efficient degradation of enoxacin. Lamellar iron-nickel double hydroxides and modified g-C3N4 are used as precursors, the g-C3N4 / FeNi / P heterojunction photocatalyst is constructed through a calcination phosphating method, and the g-C3N4 / FeNi / P heterojunction photocatalyst is applied to efficient visible light degradation of enoxacin in a water body. By constructing the heterojunction structure, the spectral response range under visible light can be increased, and the band gap structure can be regulated and controlled. The photon-generated carrier migration capability of the heterojunction catalyst can be enhanced by utilizing the bridging effect of P, and the photocatalytic reduction capability is improved. The degradation rate of the prepared heterojunction material on enoxacin within 40 min can reach 99%. The photocatalyst is simple in preparation method, wide in raw material source, low in price and easy for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control engineering, and relates to research on the preparation technology of heterojunction photocatalytic materials, in particular to the preparation of iron-nickel double phosphide and graphitic carbon nitride heterojunction photocatalytic materials, and particularly relates to the application of the photocatalytic material. Innovation of catalyst visible light efficient and low-consumption degradation of enoxacin. Background technique [0002] Enoxacin (ENO) is a third-generation fluoroquinolone antibiotic with good therapeutic effect, low allergy rate, and can be used for bacterial infections in humans indiscriminately, but it is difficult to be completely decomposed in the human body. After entering the environment through metabolic processes, it can exist in water for a long time, posing potential risks to ecosystems and human health. [0003] The catalytic method achieves ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCB01J27/24C02F1/30C02F2101/38C02F2305/10B01J35/39
Inventor 于明川詹若男周玉菲牛军峰
Owner DONGGUAN UNIV OF TECH
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