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Preparation method of photocatalyst capable of degrading polyacrylamide under response of visible light and application of photocatalyst

A polyacrylamide, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve the effects of good degradation effect, simple operation and high degradation rate

Inactive Publication Date: 2014-09-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Applied Chemistry, 2012, 29 (8): 942-947, reported the preparation of titanium dioxide-graphene composites under hydrothermal conditions at 150 °C using graphite oxide and commercial titanium dioxide as precursors and photocatalysis under ultraviolet and visible light The methylene blue solution simulates dye wastewater, and the results show that the photocatalytic performance of the composite is greatly improved compared with commercial titanium dioxide, but it needs to use ultraviolet light

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]In a beaker, 5 mg graphene, 500 mg titanium dioxide and 50 mL distilled water were added, and the resulting suspension was sonicated at a frequency of 60 Hz for 20 min. Add 0.25 g CTAB to the system, stir evenly, then add 0.1 g silver nitrate and 0.9 g ammonia water, and stir at room temperature for 0.5 h. The system was filtered, washed, and dried at 20°C to remove water. Then, it was calcined at 300 °C for 50 min under a nitrogen protective atmosphere to obtain a visible light-responsive photocatalyst (AATG-1).

[0039] In 100 mL of 10 mg / L polyacrylamide aqueous solution, 10 mg of photocatalyst was added. Adsorb in the dark for 10 min to reach equilibrium. The solution was adjusted to pH 2 with HCl or NaOH, degraded at room temperature for 10 min in a visible light catalytic reactor, sampled, and centrifuged. The supernatant was taken, and the concentration of PAM solution was detected by starch-cadmium iodide spectrophotometry, and the degradation rate of PAM was ...

Embodiment 2

[0041] In a beaker, 10 mg graphene, 500 mg titanium dioxide and 60 mL distilled water were added, and the resulting suspension was sonicated at a frequency of 70 Hz for 30 min. Add 0.5 g of sodium bromide to the system, stir evenly, then add 0.2 g of silver sulfate and 1.1 g of ammonia water, and stir at room temperature for 2 h. The system was filtered, washed, and dried at 30°C to remove water. Then, it was calcined at 400 °C for 1 h under a nitrogen protective atmosphere to obtain a visible light-responsive photocatalyst (AATG-2).

[0042] In 100 mL of 20 mg / L polyacrylamide aqueous solution, 15 mg of photocatalyst was added. Adsorb in the dark for 15 min to reach equilibrium. The solution was adjusted to pH 3 with HCl or NaOH, degraded at room temperature for 20 min in a visible light catalytic reactor, sampled, and centrifuged. The supernatant was taken, and the concentration of PAM solution was detected by starch-cadmium iodide spectrophotometry, and the degradation r...

Embodiment 3

[0044] In a beaker, 10 mg graphene, 500 mg titanium dioxide and 60 mL distilled water were added, and the resulting suspension was sonicated at a frequency of 70 Hz for 30 min. Add 0.5 g CTAB to the system, stir evenly, then add 0.2 g silver nitrate and 1.1 g ammonia water, and stir at room temperature for 2 h. The system was filtered, washed, and dried at 30°C to remove water. Then, it was calcined at 400 °C for 1 h under a nitrogen protective atmosphere to obtain a visible light-responsive photocatalyst (AATG-3).

[0045] In 100 mL of 20 mg / L polyacrylamide aqueous solution, 15 mg of photocatalyst was added. Adsorb in the dark for 15 min to reach equilibrium. The solution was adjusted to pH 3 with HCl or NaOH, degraded at room temperature for 20 min in a visible light catalytic reactor, sampled, and centrifuged. The supernatant was taken, and the concentration of PAM solution was detected by starch-cadmium iodide spectrophotometry, and the degradation rate of PAM was meas...

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Abstract

The invention belongs to the technical field of photocatalysts, relates to a photocatalyst capable of degrading polyacrylamide, and particularly relates to a preparation method of the photocatalyst capable of degrading polyacrylamide under response of visible light and application of the photocatalyst. The preparation method of the photocatalyst comprises the following steps: firstly, preparing graphene oxide by an improved Hummers method; then preparing graphene by a hydrothermal method, and then preparing the photocatalyst responding to visible light by taking grapheme, titanium dioxide, a bromine source, silver salt and ammonium hydroxide as raw materials by deposition-deposition and photo reduction method as well as high-temperature calcination. According to the invention, polyacrylamide macromolecules in the water solution are degraded by the catalyst. The experimental result shows that the catalyst has a favorable degrading effect for polyacrylamide which is taken as a degrading object; the operation is simple; and the photocatalyst has great development and application prospects in degrading macromolecule polyacrylamide contaminants under visible light condition.

Description

Technical field [0001] The present invention is a photocatalyst in the field of photocatalytic technology, which involves the preparation method and application of a photocatalytic agent that degrades polyacrylamide, which specializes in a visible optical response degradation polyacrylamide. Background technique [0002] In recent decades, photocatalytic degradation organic pollutants have attracted more and more attention.Among the many photocatalysts, TIO 2 It is the most extensive semiconductor optical catalyst.But TIO 2 As a kind of wide -ranging material, it can only be excited by ultraviolet light with short wavelengths, which is extremely unfavorable for the use of 4%ultraviolet light content; in addition, light stimulate TIO TIO 2 The compound ratio of photochemical electron-flooring generated by the occurrence of photochemical electronics, resulting in low optical quantum efficiency and not prominent photocatalytic performance, which restricted in practical applications....

Claims

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Application Information

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IPC IPC(8): B01J27/135C02F1/30C02F101/38
CPCY02W10/37
Inventor 邱凤仙荣新山杨冬亚
Owner JIANGSU UNIV
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