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Application of ground-state oxygen-dominated photocatalysts in photocatalytic degradation of pollutants

A photocatalyst, oxygen atom technology, applied in the field of photocatalytic degradation, can solve the problems of incomplete removal of pollutants, toxicity, slow oxidation of organic pollutants, etc.

Active Publication Date: 2022-07-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to O 3 Selective oxidation between pollutants, some organic pollutants are oxidized relatively slowly, resulting in incomplete removal of pollutants or generation of toxic intermediates

Method used

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  • Application of ground-state oxygen-dominated photocatalysts in photocatalytic degradation of pollutants
  • Application of ground-state oxygen-dominated photocatalysts in photocatalytic degradation of pollutants
  • Application of ground-state oxygen-dominated photocatalysts in photocatalytic degradation of pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Ground state oxygen atoms dominate the degradation of the drug carbamazepine.

[0048] (1) Preparation of g-C 3 N 4 : Weigh 10g of urea and place it in a crucible with a lid, and place it in a muffle furnace at 5°C for min. -1 The heating rate was heated to 550 °C and then held for 2 h. Collect the light yellow product, grind it into powder with an agate mortar for further use, and the obtained powder product is g-C 3 N 4 .

[0049] for the obtained g-C 3 N 4 testing, such as Figures 1 to 3 shown, figure 1 for g-C 3 N 4 SEM images of figure 2 for g-C 3 N 4 TEM image of , image 3 for g-C 3 N 4 of the X-ray diffraction pattern.

[0050] (2) Weigh 10mg of g-C 3 N 4 The catalyst was placed in a test tube, 50 mL of 10 mg / L carbamazepine solution was added to the test tube, stirred under a magnetic stirrer, and the speed was set to 500 rpm for the reaction, and the above solution was magnetically stirred for 30 min to ensure that the adsorptio...

Embodiment 2

[0053] Example 2: Ground-state oxygen-dominated degradation of the dye Rhodamine B.

[0054] (1) Weigh 50mg of g-C 3 N 4 The catalyst was placed in a test tube, 50 mL of 20 mg / L Rhodamine B solution was added to the test tube, stirred under a magnetic stirrer, and the speed was set to 500 rpm for reaction, and the above solution was magnetically stirred for 30 min to ensure that the adsorption / desorption equilibrium was reached. . Then add 100 μL of sodium hypochlorite solution to the system and turn on the 500W xenon lamp to start timing.

[0055] (2) Take a sample every 30 minutes, filter the obtained solution through a 0.22 μm organic polytetrafluoroethylene disposable filter head, and measure the residual Rhodamine B concentration in the system with an ultraviolet spectrophotometer.

[0056] The experimental results are as Figure 4 As shown, within 6h, under the irradiation of 500W xenon lamp, g-C was added 3 N 4 The degradation rate of rhodamine B by the system wit...

Embodiment 3

[0057] Example 3: Quenching experiment of photocatalytic degradation of carbamazepine dominated by ground-state oxygen atoms

[0058] (1) Weigh 10mg of g-C 3 N 4 The catalyst was placed in a glass bottle with a stopper, 50mL of 10mg / L carbamazepine solution was added to the bottle, the stopper was plugged after nitrogen was passed for 30min, placed under a magnetic stirrer to stir, and the rotating speed was set to 500rpm to carry out the reaction. The solution was magnetically stirred for 30 min to ensure adsorption / desorption equilibrium was reached. Then add 50 μL of sodium hypochlorite solution to the system and turn on the 500W xenon lamp to start timing.

[0059] (2) Take a sample every 30 minutes, filter the obtained solution through a 0.22 μm organic polytetrafluoroethylene disposable filter head, and use high performance liquid chromatography to measure the residual carbamazepine concentration in the system. Before the dark reaction, the reaction solution was purge...

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Abstract

The invention provides an application of a photocatalyst dominated by ground-state oxygen atoms in the photocatalytic degradation of pollutants, comprising the following steps: g-C 3 N 4 Add in the aqueous solution of pollutants, react under dark conditions to reach adsorption / desorption equilibrium; then add sodium hypochlorite, catalyze under light conditions; the photocatalyst is g-C 3 N 4 and sodium hypochlorite; the pollutant is carbamazepine or rhodamine B; the g-C 3 N 4 The mass ratio with carbamazepine is (15~25): 1, the g-C 3 N 4 The mass ratio to Rhodamine B is (90-100):2. In the present invention, under the irradiation of visible light, a specific amount of g-C 3 N 4 And sodium hypochlorite, the photocatalytic oxidation process is dominated by ground-state oxygen atoms, and the degradation efficiency of organic pollutants is significantly improved. The method is simple, the reaction conditions are mild, the catalytic reaction rate of the material is fast, and the degradation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation, in particular to the application of a photocatalyst dominated by ground-state oxygen atoms in the photocatalytic degradation of pollutants. Background technique [0002] With the increasing consumption of pharmaceuticals and personal care products, personal care products (PPCPs) and their sub-products are constantly being detected in the aquatic environment. Carbamazepine (CBZ), a representative antiepileptic drug widely used in the treatment of neuropathic pain and trigeminal neuralgia, is one of the most persistent drug pollutants due to its resistance to photodegradation and biodegradation. A large amount of CBZ and its metabolites are discharged into the environment, causing great harm to human health and the environment. Rhodamine B (RhB) dye is a highly water-soluble basic dye belonging to flavonoids, which is widely used as a colorant in textiles and food. This dye is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F101/38C02F101/30
CPCC02F1/30C02F2101/308C02F2101/38C02F2101/30C02F2305/10
Inventor 江鸿朱忍
Owner UNIV OF SCI & TECH OF CHINA
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