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Method for carrying out photocatalytic degradation on bisphenol A (BPA) in water, and catalyst used in method

A catalytic degradation and photocatalytic technology, applied in physical/chemical process catalysts, chemical instruments and methods, special compound water treatment, etc., to achieve the effect of increasing specific surface area, easy promotion, and improving photocatalytic performance

Active Publication Date: 2018-02-02
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although O-doped g-C 3 N 4 There have been some studies, but there are still many problems to be studied on how to improve the method, realize controllable O doping, and further improve the visible light catalytic effect of the catalyst.

Method used

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  • Method for carrying out photocatalytic degradation on bisphenol A (BPA) in water, and catalyst used in method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 O-g-C 3 N 4 preparation of

[0026] 1. Roast melamine at 550°C for 4 hours at high temperature (heating rate is 2°C / min), grind and sieve to obtain graphite phase carbon nitride material (g-C 3 N 4 ).

[0027] 2. Weigh 2g of g-C obtained in step 1 3 N 4 Place in a 250mL beaker, add H 2 o 2 120mL, magnetically stirred at 60°C for 20min, then washed with deionized water until neutral. The obtained material is dried and sieved to obtain product H 2 o 2 -g -C 3 N 4 .

[0028] 3. The H obtained in step 2 2 o 2 -g -C 3 N 4 The material was calcined at 500°C for 2 hours to obtain the product O-g-C 3 N 4 .

[0029] figure 1 O-g-C prepared by high temperature-oxidation-high temperature joint treatment was observed using transmission electron microscopy (TEM) (JEOL JEM 2100 type). 3 N 4 Transmission electron microscope image, processed O-g-C 3 N 4 The morphology takes the form of thin fragments, and the BET specific surface area analysis adopts ...

Embodiment 2

[0030] Example 2 Visible light degradation of bisphenol A in water

[0031]The photocatalytic reaction was carried out in the XPA series-7 photocatalytic reactor produced by Nanjing Xujiang Machinery Plant, the reaction temperature was 25°C, the catalyst dosage was 0.02g, the bisphenol A (BPA) solution was 50mL, and the concentration was 10ppm. The type of catalyst is: untreated g-C 3 N 4 , g-C oxidized by single hydrogen peroxide 3 N 4 , g-C calcined at a single high temperature 3 N 4 , embodiment 1 obtains product O-g-C 3 N 4 .

[0032] g-C of single hydrogen peroxide oxidation 3 N 4 The preparation method is hydrothermal method, weigh 2g of g-C 3 N 4 In a 250mL beaker, add 120mL of hydrogen peroxide, calcinate at 550°C for 3h, then transfer to a reaction kettle, and hydrothermally react at 150°C for 5h to obtain the product.

[0033] Single high temperature calcined g-C 3 N 4 The preparation method is under nitrogen atmosphere, the g-C 3 N 4 Calcined at 500°...

Embodiment 3

[0037] Example 3 O-g-C under different conditions 3 N 4 preparation of

[0038] 1. Roast melamine at 550°C for 4 hours at high temperature (heating rate is 2°C / min), grind and sieve to obtain graphite phase carbon nitride material (g-C 3 N 4 ).

[0039] 2. Weigh 2g of g-C obtained in step 1 3 N 4 Place in a 250mL beaker, add H 2 o 2 60mL, magnetically stirred at 60°C for 20min, then washed with deionized water until neutral. The obtained material is dried and sieved to obtain product H 2 o 2 -g -C 3 N 4 .

[0040] 3. The H obtained in step 2 2 o 2 -g -C 3 N 4 The material was calcined at 500°C for 2 hours to obtain the product O-g-C 3 N 4 .

[0041] Adopt the ASAP2020 type BET specific surface area tester of Micromeritics company to analyze the O-g-C that step 3 obtains 3 N 4 BET specific surface area, using N 2 Static adsorption method for analysis and determination of product specific surface area 11.80m 2 / g.

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Abstract

The invention discloses a method for carrying out photocatalytic degradation on bisphenol A (BPA) in water, and a catalyst used in the method. The method comprises the following steps: fully mixing aBPA solution with O-g-C3N4, firstly absorbing in a dark environment, and then carrying out catalytic degradation for 3h or more under the condition of visible light so as to realize a degradation rateof 60% or more, wherein the O-g-C3N4 is obtained by means of high temperature-oxidation-high temperature combined treatment. According to the method, melamine which is low in price and each to obtainis taken as a raw material, and the O-g-C3N4 product with excellent performance can be prepared by means of the path of high temperature-oxidation-high temperature combined treatment; the whole preparation process is simple and quick in operation steps and easier to popularize. Compared with the product treated by means of single treatment such as single oxidation or single high-temperature calcination, the O-g-C3N4 prepared by means of the path of high temperature-oxidation-high temperature combined treatment has improved O2 doping effect, enlarged specific surface area and obviously expanded light absorption domain; after the method is adopted, the photocatalytic degradation efficiency of the BPA in the water within a visible light region reaches 62.3% and is 7 times higher than the degradation efficiency obtained by using the product treated by means of the single treatment; therefore, the method provided by the invention has very good practicality.

Description

technical field [0001] The invention belongs to the technical field of oxygen-doped graphite phase carbon nitride, and in particular relates to a method for photocatalytically degrading bisphenol A in water and a catalyst used therein. Background technique [0002] Photocatalytic technology can realize the efficient conversion and storage of solar energy, and can drive important chemical reactions under certain conditions, and has great advantages in solving environmental energy problems. Traditional semiconductor photocatalysts have disadvantages such as narrow spectral response range, low solar energy utilization rate and poor stability. Exploring visible light catalysts with excellent performance, low price and stability is of great significance in solving energy and environmental problems. [0003] Graphite carbon nitride (graphitic carbon nitride, referred to as g-C 3 N 4 ) as a new type of non-metallic semiconductor photocatalyst has the advantages of good stability...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/34
CPCC02F1/30B01J27/24C02F2101/345C02F2305/10B01J35/39
Inventor 唐荣王小平秦品珠干方群丁任丽陈欢
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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