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Pre-radiation grafting synthesis method of nanometer TiO2-based catalyst for efficient adsorption-reduction of high-toxicity hexavalent chromium ions

A technology of hexavalent chromium ions and photocatalysts, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of solvent loss, pollution-free pollution, high production cost, etc., and achieve reaction The effect of mild conditions and avoiding secondary pollution

Active Publication Date: 2018-11-20
HUBEI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional removal of hexavalent chromium ions (Cr 6+ ) methods mainly include: chemical precipitation method, solvent extraction separation, adsorption method and ion exchange method, etc. The disadvantages are: ①The introduction of excessive additives will cause secondary pollution; ②Serious loss of solvent and large consumption; ③Low regeneration efficiency ; ④ High production cost and large consumption; ⑤ Transferring pollutants from one phase to another does not make pollutants completely pollution-free

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh a certain amount of nano-TiO 2 The powder was put into a vacuum PE sealed bag with a thickness of about 2 mm, and placed under the electron beam for irradiation. The selected electron beam energy was 1 MeV, the radiation dose was 10 kGy, and the dose rate was 5 kGy / pass. Nano-TiO after irradiation 2 The sample was quickly dropped into a three-necked flask containing 5 parts of dimethylaminoethyl methacrylate, 0.5 part of Tween 80, and 0.1 part of sodium dihydrogen phosphate solution in parts by mass, and N 2 and stirred for 0.5 h, the obtained sample was taken, washed with alcohol and water, dried in a vacuum oven at 60°C for 24 h, then extracted by Soxhlet for 8 h at a temperature of 40°C, and then vacuum-dried again. Preparation of Nano-TiO with Efficient Adsorption-Reduction of Highly Toxic Hexavalent Chromium Ions 2 base photocatalyst.

[0024] Quantitative nano-TiO 2 base photocatalyst dissolved in 20 mL, 10 ppm Cr 6+ solution, adjust the pH to 3, and ul...

Embodiment 2

[0026] Weigh a certain amount of nano-TiO 2 The powder was put into a vacuum PE sealed bag with a thickness of about 2 mm, and placed under an electron beam for irradiation. The selected electron beam energy was 1 MeV, the radiation dose was 30 kGy, and the dose rate was 10 kGy / pass. Nano-TiO after irradiation 2 Samples were quickly put into a three-necked flask containing 10 parts of diethylaminoethyl methacrylate, 1 part of polyethylene glycol 2000, and 0.2 parts of triethanolamine solution in parts by mass, and N 2 and stirred for 1 h, the obtained sample was taken, washed with alcohol and water, dried in a vacuum oven at 60°C for 24 h, then extracted by Soxhlet for 10 h at a temperature of 60°C, and then vacuum-dried again. Preparation of Nano-TiO with Efficient Adsorption-Reduction of Highly Toxic Hexavalent Chromium Ions 2 base photocatalyst.

[0027] Quantitative nano-TiO 2 base photocatalyst dissolved in 20 mL, 10 ppm Cr 6+ solution, adjust the pH to 3, and ultras...

Embodiment 3

[0029] Weigh a certain amount of nano-TiO 2 The powder was put into a vacuum PE sealed bag with a thickness of about 2 mm, and placed under the electron beam for irradiation. The selected electron beam energy was 1 MeV, the radiation dose was 60 kGy, and the dose rate was 30 kGy / pass. Nano-TiO after irradiation 2 The sample was quickly put into a three-necked flask containing 20 parts of tert-butylaminoethyl methacrylate, 2 parts of Span 60, and 1 part of acetic acid solution in parts by mass, and N 2 And stirred for 2 hours, the obtained sample was taken, washed with alcohol and water, dried in a vacuum oven at 60°C for 24 hours, then extracted by Soxhlet for 24 hours at a temperature of 80°C, and then vacuum-dried again. Preparation of Nano-TiO with Efficient Adsorption-Reduction of Highly Toxic Hexavalent Chromium Ions 2 base photocatalyst.

[0030] Quantitative nano-TiO 2 base photocatalyst dissolved in 20 mL, 10 ppm Cr6+ solution, adjust the pH to 3, and ultrasonic ti...

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Abstract

The invention relates to the technical fields of removal of heavy metal ions and degradation of organic pollutants in a sewage system, in particular to a pre-radiation grafting synthesis method of a nanometer TiO2-based catalyst for efficient adsorption-reduction of high-toxicity hexavalent chromium ions. The method comprises the following steps: (1) irradiating nanometer TiO2; (2) dispersing theirradiated nanometer TiO2 into emulsion containing a vinyl monomer. According to the catalyst prepared according to the method, high-valence and high-toxicity hexavalent chromium ions are transformedinto non-toxic trivalent chromium ions in an efficient and pollution-free way.

Description

technical field [0001] The invention relates to the technical field of the removal of heavy metal ions in sewage systems and the degradation of organic pollutants, in particular to a nano-TiO that efficiently absorbs and reduces highly toxic hexavalent chromium ions 2 Synthetic method of pre-radiation grafting based photocatalysts. Background technique [0002] Nano-TiO 2 Semiconductor oxides have attracted great attention in the field of photocatalytic reactions. When TiO 2 After the semiconductor absorbs light energy with energy greater than the forbidden band width, the valence band electrons are excited to the conduction band, generating electron-hole pairs. The photogenerated holes have strong oxidative properties, which can promote many chemical reactions, such as photoreduction, photocatalysis , Photoorganic synthesis, etc. Nano-TiO 2 The particle size is small, the specific surface is large, and the surface energy is high, and the nanoparticles are easy to agglo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J21/06B01J31/06B01J37/34C02F1/30C02F101/22
CPCC02F1/30B01J21/063B01J31/06B01J31/38B01J37/341C02F2101/22C02F2305/10B01J35/39
Inventor 李月生
Owner HUBEI UNIV OF SCI & TECH
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