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

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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 ultrav

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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