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Method for promoting efficient photo-catalytic oxidation of phenolic pollutants by organic arsenic pollutants in situ

A technology for photocatalytic oxidation and pollutants, applied in water pollutants, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve problems such as phenolic compound pollution, achieve efficient removal, easy preparation, and high performance effects

Active Publication Date: 2020-02-11
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the increasingly serious pollution problems of organic arsenic and phenolic compounds, the present invention provides a method for promoting the efficient photocatalytic oxidation of phenolic pollutants in situ by using organic arsenic pollutants, aiming at 2 The catalytic oxidation reaction under ultraviolet light can efficiently degrade organic arsenic and at the same time realize the modification of the catalyst surface, so as to further realize the efficient removal of phenolic pollutants

Method used

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  • Method for promoting efficient photo-catalytic oxidation of phenolic pollutants by organic arsenic pollutants in situ
  • Method for promoting efficient photo-catalytic oxidation of phenolic pollutants by organic arsenic pollutants in situ
  • Method for promoting efficient photo-catalytic oxidation of phenolic pollutants by organic arsenic pollutants in situ

Examples

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Effect test

Embodiment 1

[0035] Example 1, crystal plane control TiO 2 Preparation of photocatalyst

[0036] TiO used in this example 2 Photocatalyst regulation of TiO for crystal facets 2 The photocatalyst has a single-crystal crystallographic structure, is in the form of nano-crystal particles, has a regular quadrilateral sheet microscopic morphology, and has high-energy {001} polar crystal planes and low-energy {101} non-polar crystal planes exposed on the surface at the same time, and its preparation method As follows: add 20mL tetrabutyl titanate to 20mL HF aqueous solution with a concentration of 24wt.%, stir evenly to obtain a precursor solution; transfer the precursor solution to an autoclave, and react at a constant temperature of 170°C for 24h; cool down after the reaction After reaching room temperature, the obtained product was washed with ethanol, concentrated alkali and distilled water several times, dried at 60°C for 12h, and then calcined at 400°C for 5h in the air atmosphere to obta...

Embodiment 2

[0038] The influence of ROX in the synergistic degradation system of embodiment 2, chlorophenol (4-CP) and ROX

[0039] 1. In order to verify the influence of ROX in the synergistic degradation system of chlorophenol (4-CP) and ROX, three sets of experimental systems were set up:

[0040] First, at room temperature, in a 50mL beaker, the crystal facet-regulated TiO prepared in Example 1 was cleaned by ultrasonic cleaning. 2 Disperse in deionized water with a dispersion concentration of 0.7g / L;

[0041] Then: in the first group of experimental systems, add 4-CP to the beaker to a concentration of 10ppm; in the second group of experimental systems, add 4-CP and ROX stock solution to the beaker to both concentrations of 10ppm; the third group In the experimental system, add the ROX stock solution to the beaker to a concentration of 10ppm. The pH=6 of the three systems was adjusted by 0.1M HCl or NaOH.

[0042] Finally, the obtained systems were first magnetically stirred at 30...

Embodiment 3

[0046] Embodiment 3, the influence of pH p-chlorophenol (4-CP) and ROX synergistic degradation system

[0047] In order to verify the influence of pH on the synergistic degradation system of chlorophenol (4-CP) and ROX, the following experiments were set up:

[0048] First, at room temperature, in a 50mL beaker, the crystal facet-regulated TiO prepared in Example 1 was cleaned by ultrasonic cleaning. 2 Disperse in deionized water with a dispersion concentration of 0.7g / L; then add 4-CP and ROX stock solutions to the beaker until their concentrations are both 10ppm. Finally, the pH of the system was adjusted to 3, 4, 5, 6, 7, 8, and 9 by 0.1M HCl or NaOH, respectively. The resulting suspension was first magnetically stirred at 300 rpm for 30 minutes under light-proof conditions to fully carry out adsorption equilibrium on the catalyst surface, and then turn on ultraviolet light irradiation to carry out photocatalytic degradation reaction. The reaction time lasted for 8 hours. ...

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Abstract

The invention discloses a method for promoting efficient photo-catalytic oxidation of phenolic pollutants by organic arsenic pollutants in situ. The method comprises the steps that a TiO2 photocatalyst is added into waterwater to be treated containing the organic arsenic pollutants and the phenolic pollutants simultaneously to form a photocatalytic degradation system, and synergistic photocatalytic degradation of the organic arsenic pollutants and the phenolic pollutants is realized under illumination. According to the method for promoting the efficient photo-catalytic oxidation of the phenolic pollutants by the organic arsenic pollutants in situ, on a premise of not additionally adding water treatment costs, through the collaborative coupling of the organic arsenic pollutants in water andthe TiO2 photocatalyst, the degradation efficiency and stability of the phenolic pollutants is obviously improved in situ.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to efficient and coordinated oxidation removal of persistent organic pollutants. Background technique [0002] Photocatalytic water treatment technology combines photocatalysts with polluted water, and uses light energy as a drive to oxidize, degrade and remove environmental pollutants. Based on TiO 2 The photocatalytic oxidation technology has been widely studied as an effective technical means to repair water pollution, mainly because of its high activity, good stability, non-toxic, low price and other practical environmental application potential, and it has strong oxidation ability, no Secondary pollution and other advantages. TiO 2 The process of photocatalytic oxidation degradation of environmental pollutants is caused by valence band holes (h VB + ), hydroxyl radicals (·OH) and superoxide radicals (O 2 ·- ) and other oxidation states. Hydroxyl radic...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/30C02F101/30C02F101/34C02F101/36
CPCC02F1/725C02F1/30C02F2101/30C02F2101/345C02F2101/36C02F2305/10
Inventor 张爱勇黄乃辉周扬赵品诚徐硕
Owner HEFEI UNIV OF TECH
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