Method for producing reducing pollutant in water with ultraviolet light photocatalysis degradation

A technology for the production of hydrogen and pollutants, applied in chemical instruments and methods, light water/sewage treatment, hydrogen, etc., can solve the problems of easy explosion and low yield, and achieve the effects of no need for heat dissipation, low energy consumption, and easy industrialization

Inactive Publication Date: 2009-08-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Application Information

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Problems solved by technology

[0003] 1. The mixed gas of hydrogen and oxygen produced by the reaction is easy to explode;
[0004] 2. Low yield
The photocatalytic degradation of pesticides, intermed

Method used

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  • Method for producing reducing pollutant in water with ultraviolet light photocatalysis degradation
  • Method for producing reducing pollutant in water with ultraviolet light photocatalysis degradation
  • Method for producing reducing pollutant in water with ultraviolet light photocatalysis degradation

Examples

Experimental program
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Embodiment 1

[0029] Photocatalyst Pt / TiO 2 Preparation method of photodeposition: add hexahydrate chloroplatinic acid aqueous solution to DegussaP25 TiO 2 In the suspension of powder and water (the addition amount of catalyzer is not strictly limited in the present invention), under nitrogen atmosphere and magnetic stirring, 250W high-pressure mercury lamp top irradiates 10h, and reactor constant temperature is 25 ± 3 ℃, after reaction finishes, use 5 No. sand core funnel and vacuum pressure filtration, and then wash the photocatalyst with deionized water until the conductivity of the filtrate after suction filtration is less than 10 μs cm -1 . After vacuum-drying at 120°C for 10 hours, it was ground through a 300-mesh sieve.

[0030] In this embodiment, the reduced water body pollutant atrazine (atrazine) is taken as an example for illustration. Atrazine is a selective herbicide used in large quantities, resulting in serious residues and polluting groundwater sources. Atrazine is also...

Embodiment 2

[0033] The difference from Example 1 is that the reducing pollutant uses 2,4-dichlorophenoxyacetic acid (2,4-D) (concentration is 1.0 mmol / l). 2,4-D is the world's first herbicide, the second most selective herbicide in the world, and the world's first broadleaf weed herbicide. It, like atrazine, pollutes water bodies through agricultural and horticultural use. Although 2,4-D has low acute toxicity, it is a potential endocrine disruptor, and its main biodegradation product is 2,4-dichlorophenol, and skin contact with molten 2,4-dichlorophenol can Rapid lethality. Elimination of 2,4-D therefore also has important environmental implications.

[0034] With the operation of embodiment 1, the result is as image 3 a, b shown. 2,4-D was 84% ​​degraded by liquid chromatography analysis after 2 hours of light irradiation. At this time, 38.4 μmol of hydrogen gas was produced. The photolysis of water under the same conditions produces 0.925 μmol of hydrogen. Therefore, 2,4-D, an a...

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Abstract

The invention relates to a method for realizing photocatalytic degradation of reductive pollutants in water through feeble ultraviolet light and simultaneously producing hydrogen, which is to realize the removal of the reductive pollutants in water body and simultaneously produce the hydrogen in a closed system with an atmosphere which is oxygen-free or has the oxygen content of less than 5 mmol.dm, in the presence of photocatalyst and under the irradiation of light with the wavelength of between 200 and 400 nanometers, wherein the reaction temperature is between 0 and 95 DEGC; the reaction pressure is between 0 and 3 atmospheric pressure; and the light intensity of a single ultraviolet light source is less than 100 mW.cm. Compared with the prior photocatalytic decomposition water, the method has the advantages that the hydrogen yield is obviously increased; reductive water body pollutants, particularly organic pollutants provided with a plurality of aromatic functional groups can be effectively removed; light energy and energy of the reductive pollutants can be converted into chemical energy of the hydrogen-the future energy carrier; and the energy consumption is low, heat dissipation is not required, and industrialization is easy.

Description

technical field [0001] The invention relates to a method for producing hydrogen gas by using weak ultraviolet photocatalysis to eliminate pollutants such as pesticides and intermediates that are widely used and existing in the environment, and specifically relates to a method for eliminating reducing water body pollutants, especially aromatic pollution. method for the simultaneous and significant production of hydrogen gas. Background technique [0002] Photocatalytic water splitting has attracted widespread attention because of its potential to directly harness sunlight to produce hydrogen, a renewable energy carrier. The basic principle is that photocatalysts produce reactive photogenerated electrons and photogenerated holes under the action of light. Photogenerated electrons reduce water to produce hydrogen, while photogenerated holes oxidize water to produce oxygen. There are some deficiencies in the current photolysis water technology that need to be improved: [000...

Claims

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Application Information

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IPC IPC(8): C01B3/22C01B3/26C02F1/32
Inventor 刘鸿张向华李文钊徐恒泳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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