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Application of ground state oxygen atom dominated photocatalyst in photocatalytic degradation of pollutant

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

Active Publication Date: 2021-06-01
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 atom dominated photocatalyst in photocatalytic degradation of pollutant
  • Application of ground state oxygen atom dominated photocatalyst in photocatalytic degradation of pollutant
  • Application of ground state oxygen atom dominated photocatalyst in photocatalytic degradation of pollutant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: The ground state oxygen atom dominates the degradation 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 min -1 The heating rate was heated to 550°C and then maintained for 2h. Collect the product with light yellow color and grind it into powder with agate mortar for further use. The obtained powder product is g-C 3 N 4 .

[0049] To get g-C 3 N 4 to detect, such as Figure 1~3 as shown, figure 1 for g-C 3 N 4 The scanning electron microscope image of figure 2 for g-C 3 N 4 TEM image of image 3 for g-C 3 N 4 The X-ray Diffraction Spectrum.

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

Embodiment 2

[0053] Example 2: Degradation dye Rhodamine B dominated by ground-state oxygen atoms.

[0054] (1) Weigh 50mg of g-C 3 N 4 Put the catalyst in a test tube, add 50mL of 20mg / L Rhodamine B solution into the test tube, stir under a magnetic stirrer, set the rotation speed to 500rpm for reaction, and stir the above solution magnetically for 30min to ensure adsorption / desorption equilibrium . Then add 100 μ L 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 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] Experimental results such as Figure 4 As shown, within 6 hours, under the irradiation of 500W xenon lamp, add g-C 3 N 4 The degradation rate of rhodamine B in the system with sodium hypochlorite is as high as 97.5%, without addin...

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 Catalyst is placed in the glass bottle with stopper, adds the carbamazepine solution of 50mL 10mg / L in the bottle, plugs up the stopper after passing nitrogen 30min, is placed in the magnetic stirrer and stirs, and setting speed is 500rpm to react, the above-mentioned The solution was magnetically stirred for 30 min to ensure adsorption / desorption equilibrium. Then add 50 μL of sodium hypochlorite solution to the system and turn on the 500W xenon lamp to start timing.

[0059] (2) Samples were taken every 30 minutes, and the solution was filtered through a 0.22 μm organic polytetrafluoroethylene disposable filter head, and the residual carbamazepine concentration in the system was measured by high performance liquid chromatography. Before the dark reaction, the reaction solution was passed nitrogen gas for 30 minut...

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Abstract

The invention provides an application of a ground state oxygen atom dominated photocatalyst in photocatalytic degradation of a pollutant, wherein the application comprises the following steps: adding g-C3N4 into an aqueous solution of the pollutant, and reacting under a dark condition to achieve adsorption / desorption balance; and then adding sodium hypochlorite, and catalyzing under an illumination condition, wherein the photocatalyst is g-C3N4 and sodium hypochlorite, the pollutant is carbamazepine or rhodamine B, and the mass ratio of the g-C3N4 to the carbamazepine is (15-25):1, and the mass ratio of the g-C3N4 to the rhodamine B is (90-100):2. Under the irradiation of visible light, ground state oxygen atoms play a leading role in the photocatalytic oxidation process through a specific amount of g-C3N4 and sodium hypochlorite, the degradation efficiency of the organic pollutant is remarkably improved, and the method is simple, mild in reaction condition, high in material catalytic reaction rate and high in degradation efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation, and in particular relates to the application of a photocatalyst based on 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 continuously detected in aquatic environments. Carbamazepine (CBZ), a representative antiepileptic drug widely used in the treatment of neuropathic pain and trigeminal neuralgia, is one of the most persistent drug contaminants 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 kind of highly water-soluble basic dye belonging to flavenes, which is widely used as coloring agent in textile and food. ...

Claims

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Application Information

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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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