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Method for removing arsenic by loading titanium dioxide with activated carbon fiber hydrothermal method by means of photoelectrocatalysis oxidation

A technology of activated carbon fiber and titanium dioxide, which is applied in chemical instruments and methods, physical/chemical process catalysts, oxidized water/sewage treatment, etc., can solve the problems of ineffective removal of trivalent arsenic and high cost of arsenic removal, and achieve the benefit of large-scale Large-scale promotion, convenient operation and management, and low energy consumption

Inactive Publication Date: 2013-02-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that trivalent arsenic cannot be effectively removed and the cost of arsenic removal is high in the prior art, and to provide a drinking water treatment method with more application value, so as to achieve the purpose of purifying high-arsenic drinking water at low cost

Method used

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  • Method for removing arsenic by loading titanium dioxide with activated carbon fiber hydrothermal method by means of photoelectrocatalysis oxidation
  • Method for removing arsenic by loading titanium dioxide with activated carbon fiber hydrothermal method by means of photoelectrocatalysis oxidation
  • Method for removing arsenic by loading titanium dioxide with activated carbon fiber hydrothermal method by means of photoelectrocatalysis oxidation

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 10g of tetrabutyl titanate into an Erlenmeyer flask, add 45mL of absolute ethanol and 20mL of glacial acetic acid in sequence, stir magnetically for 30min, and call it A solution. Add 25mL of absolute ethanol, 6.5mL of twice distilled water and 5mL of glacial acetic acid into another Erlenmeyer flask, stir for 30min with magnetic force, and call it B solution. Use a separatory funnel to drop liquid B into liquid A under magnetic stirring at a rate of 1 drop / second, control the stirring speed to 300 r / min, and continue stirring for 3 hours after the dropping is completed.

[0032] Measure more than 60mL of the solution and activated carbon fibers and place them in a polytetrafluoroethylene-lined high-pressure reactor (effective volume 100mL, pressure 10MPa, filling degree 60%), and react in an oven at 180°C for 3 hours to prepare titanium dioxide-loaded activated carbon fibers. After ultrasonic cleaning for 5 minutes, dry at 105°C for 12 hours.

Embodiment 2

[0034] use as image 3 For the reactor shown, add 250mL of 2mg / L arsenic solution into the reactor, adjust the pH=7, add sodium sulfate to adjust the conductivity to 158 μs / cm, place a UV lamp with a power of 9W inside the reactor, and load 0.25g The titanium dioxide activated carbon fiber was placed inside the reactor as the anode, the activated carbon fiber was used as the cathode, and a cell pressure of 0.5V was applied. After adding the loaded titanium dioxide activated carbon fiber, it was placed in the dark for 3 hours to reach adsorption equilibrium, and the ultraviolet light was irradiated for 20 minutes. The adsorbent is 0.25g titanium dioxide powder.

[0035] The removal rate of the trivalent arsenic solution treated by single applied voltage electrosorption and photocatalytic oxidation is 6.7% and 66.7% respectively. Better oxidation removal effect.

Embodiment 3

[0037] use as image 3 For the reactor shown, add 250mL of 0.25mg / L arsenic solution into the reactor, adjust the pH=7, add sodium sulfate to adjust the conductivity to 158 μs / cm, place a UV lamp with a power of 100W inside the reactor, 0.25g Activated carbon fibers loaded with titanium dioxide are placed inside the reactor as anodes, activated carbon fibers are used as cathodes, and a tank pressure of 1V is applied. After adding activated carbon fibers loaded with titanium dioxide, they are placed in the dark for 3 hours to reach adsorption equilibrium, and the ultraviolet light is illuminated for 60 minutes. The adsorbent is 0.03g active. Aluminum oxide powder.

[0038] The trivalent arsenic solution treated by single applied voltage electrosorption and photocatalytic oxidation was determined to have a removal rate of 6.7% and 91.3%, respectively, and the trivalent arsenic solution treated under the above conditions was determined to have a removal rate of 99.7%, and the ars...

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Abstract

The invention discloses a method for removing arsenic by loading titanium dioxide with an activated carbon fiber hydrothermal method by means of photoelectrocatalysis oxidation. The method comprises the following steps of: oxidizing the trivalent arsenic, which is high in toxicity and difficult to treat, pentavalent arsenic which is easily treated by photoelectrocatalysis oxidation treatment, and completely removing the pentavalent arsenic by adsorbents which can strongly absorb the arsenic, namely titanium dioxide, iron oxide or activated aluminium oxide and the like. The method disclosed by the invention is simple in technology, convenient to operate, low in cost, and free from the generation of sludge residue, the arsenic in water can be effectively removed, an activated carbon fiber photoelectrode can run for a long term, and can be used at a large area and a large scale without changing, and the outlet water quality fulfills the national standard, so that the method is suitable for treating the drinking water and the high-arsenic waste water.

Description

technical field [0001] The invention relates to a method for removing arsenic from drinking water. More specifically, the present invention relates to a method for removing arsenic by photoelectric catalytic oxidation of activated carbon fiber loaded with titanium dioxide by hydrothermal method. Background technique [0002] Arsenic is widely present in the food chain of soil, rock, water and animals and plants in nature. In my country, endemic arsenic poisoning in drinking water is distributed in 8 provinces and municipalities, with more than 2 million people affected. Arsenic pollution will cause serious human health problems. Long-term drinking of high-arsenic drinking water can lead to blackfoot and skin cancer , and died of cerebral palsy in severe cases. The latest "Drinking Water Sanitation Standard" (GB5749-2006) puts forward higher requirements on the quality of urban water supply, and the arsenic content is reduced from 0.05mg / L in the old standard to 0.01mg / L. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06B01J21/18B01J35/06C02F1/32C02F1/72C02F1/28
Inventor 潘湛昌谢英豪魏志钢左俊辉胡光辉肖楚民
Owner GUANGDONG UNIV OF TECH
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