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Preparation, products and application of high-selectivity titanium dioxide photoanode applied to organic fluorine-containing sewage

A photoanode, titanium dioxide technology, applied in the direction of catalyst activation/preparation, water treatment parameter control, chemical instruments and methods, etc., can solve the problem that the target pollutants cannot be effectively degraded, and solve the problem of recycling difficulties and affecting water quality, avoiding The effect of particle agglomeration, improving the ability of selective oxidation

Active Publication Date: 2019-03-01
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But using nano TiO 2 When photoelectric materials treat the actual pollution system, high-concentration non-toxic or low-toxic organic pollutants will compete with low-concentration and highly toxic organic pollutants on the surface of the catalyst for adsorption, resulting in the target pollutants not being effectively degraded due to competitive adsorption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of high-efficiency selective titanium dioxide photoanode, with F - As a facet-directing agent, trifluorotoluene is used as a template, and (001) crystal facet TiO with high-efficiency photocatalytic performance is synthesized by ultrasonic-hydrothermal method 2 Molecularly imprinted photoanode materials, according to the following steps:

[0028] (1) Carrier pretreatment

[0029] Prepare a certain amount of H 2 SO 4 and 30% H 2 o 2 For the mixed cleaning solution, place the conductive glass in the mixed solution and soak it for about 40 minutes, then take it out, then clean it with absolute ethanol and deionized water, and finally dry it for later use;

[0030] (2) (001) crystal plane TiO 2 Preparation of Molecularly Imprinted Photoanode Materials

[0031] Using NaF as the crystal plane structure directing agent, according to n Ti :n F Add tetrabutyl titanate at a ratio of 1:2.5. During the process of mixing and stirring, add absolu...

Embodiment 2

[0036] Similar to Example 1, follow the steps below:

[0037] (1) Carrier pretreatment

[0038] Prepare a certain amount of H 2 SO 4 and 30% H 2 o 2 For the mixed cleaning solution, place the conductive glass in the mixed solution and soak it for about 40 minutes, then take it out, then clean it with absolute ethanol and deionized water, and finally dry it for later use;

[0039] (2) (001) crystal plane TiO 2 Preparation of Molecularly Imprinted Photoanode Materials

[0040] Using NaF as the crystal plane structure directing agent, according to n Ti :n F Add tetrabutyl titanate at a ratio of 1:1.8. During the process of mixing and stirring, add absolute ethanol and deionized water at a volume ratio of 9:1. After stirring evenly, add 1 drop of trifluorotoluene solution, and then mix The solution and the pretreated conductive glass were transferred to an ultrasonic-hydrothermal reaction device, and the reaction temperature, ultrasonic frequency and reaction time were con...

Embodiment 3

[0045] Similar to Example 1, follow the steps below:

[0046] (1) Carrier pretreatment

[0047] Prepare a certain amount of H 2 SO 4 and 30% H 2 o 2 For the mixed cleaning solution, place the conductive glass in the mixed solution and soak it for about 40 minutes, then take it out, then clean it with absolute ethanol and deionized water, and finally dry it for later use;

[0048] (2) (001) crystal plane TiO 2 Preparation of Molecularly Imprinted Photoanode Materials

[0049] Using NaF as the crystal plane structure directing agent, according to n Ti :n F Add tetrabutyl titanate at a ratio of 1:2. During the process of mixing and stirring, add absolute ethanol and deionized water at a volume ratio of 9:1. After stirring evenly, add 1 drop of trifluorotoluene solution, and then mix The solution and the pretreated conductive glass were transferred to an ultrasonic-hydrothermal reaction device, and the reaction temperature, ultrasonic frequency and reaction time were contr...

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Abstract

The invention relates to a preparation method of a high-selectivity titanium dioxide photoanode applied to organic fluorine-containing sewage and products and application thereof. F- serves as crystalorientating agent, trifluorotoluene serve as a template, and an ultrasonic-hydrothermal method is applied to prepared a (001) crystal face TiO2 molecular imprinting photoanode material with high photoelectrocatalytic performance. The preparation method comprises carrier pretreatment, preparation of the (001) crystal face TiO2 molecular imprinting photoanode material, and fluorine removal treatment. The high-selectivity titanium dioxide photoanode applied to the organic fluorine-containing sewage can efficiently selectively reduce the COD (chemical oxygen demand) of the fluorine-containing sewage and can be applied to the field of water pollution treatment. The preparation method of the high-selectivity titanium dioxide photoanode applied to the organic fluorine-containing sewage combinesand gives full play to the advantages of the special molecular identification ability of molecular imprinting technology and the nano-photoelectrocatalytic oxidation technology, and enhances photoelectrocatalytic selective degradation and meanwhile effectively solves the problem of difficulty in catalyst recycling, thereby achieving high practical application values.

Description

technical field [0001] The invention relates to a high-efficiency selective TiO applied to organic fluorine-containing wastewater 2 The preparation method of the photoelectric anode and its product and application can effectively reduce the COD of fluorine-containing wastewater, and can be used in the field of water pollution pretreatment. Background technique [0002] Fluorine is one of the most widely distributed elements on the earth, accounting for 0.06~0.09% of the earth's crust. Since fluorine is very active chemically and can interact with almost all elements, fluorine mostly exists in the form of compounds. 3,4-Difluorotrichloromethylbenzene has strong stability because of the trifluoromethyl group in its molecule, and is used as the main intermediate in the synthesis of fluorine-containing pesticides. The waste water produced during the synthesis of such intermediates has a high concentration , Poor biodegradability, refractory degradation, and large changes in wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/34B01J37/10B01J37/18C02F1/46C02F1/32C02F1/72C02F101/36
CPCC02F1/32C02F1/46C02F1/725B01J21/063B01J37/10B01J37/18B01J37/343C02F2209/08C02F2305/10C02F2101/36B01J35/39
Inventor 何丹农童琴王泽轩赵昆峰代卫国胡丹金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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