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Catalyst for photocatalysis and degradation of benzene and nitrates

A catalytic degradation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem that photocatalytic reduction of nitrate has not achieved good results, The problems of low photon utilization rate and reduced catalytic effect have achieved the effect of significant degradation effect, easy availability of materials and improved effect.

Inactive Publication Date: 2009-03-18
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, photocatalytic benzene series have achieved good results at home and abroad, and it has been reported that photocatalytic organic compounds can produce hydrogen; but at present, no good results have been achieved for photocatalytic reduction of nitrate
[0006] At the same time, TiO 2 There are also many problems in the direct photocatalytic degradation of nitrate. Due to the recombination of hole-electron pairs on the semiconductor, the utilization rate of photons is low and the catalytic effect is reduced.
The present invention adopts the bimetallic catalyst supported by titanium dioxide to degrade the method for benzene and nitrate simultaneously and has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] With Pd loading 3% and PdCu mass ratio 2:1, PdCl 2 (Pd 2+ Concentration is 0.006g / ml), CuCl 2 Solution (Cu 2+ The concentration is 0.002g / ml) by adding TiO 2 Soak in water for 0.1~5h. The mixture was evaporated to dryness at 373K in a water bath; 2 Under the conditions of 500 ° C reduction for 6h. That is, Pd(3%)-Cu(1.5%)-TiO is obtained 2 .

[0035] With Pd(3%)-Cu(1.5%)-TiO 2 As a catalyst, photocatalytic simultaneous degradation of benzene and nitrate in water. The volume of the reaction device is 300mL, and the catalyst concentration is 1g / L. The initial concentration of benzene pollutants in water is 10mg / L, and the concentration of nitrate pollutants is 50mg / L. After reacting for 4 hours at 298K, the degradation rate of benzene reaches 100%, and the degradation rate of nitrate reaches 12%.

Embodiment 2

[0037] With Pd loading 5% and PdCu mass ratio 2:1, PdCl 2 (Pd 2+ Concentration is 0.006g / ml), CuCl 2 Solution (Cu 2+ The concentration is 0.002g / ml) by adding TiO 2 Soak in water for 0.1~5h. The mixture was evaporated to dryness in a water bath at 373K; 2 Under the conditions of 500 ° C reduction for 6h. . That is, Pd(5%)-Cu(2.5%)-TiO is obtained 2 .

[0038] The photocatalytic simultaneous degradation of benzene and nitrate is the same as in Example 1. The degradation rate of benzene is 100%, and the degradation rate of nitrate is 63.5%.

[0039] It can be seen that appropriately increasing the loading of bimetals can improve the degradation efficiency of photocatalytic degradation of nitrate.

Embodiment 3

[0041] With Pd loading 7% and PdCu mass ratio 2:1, PdCl 2 (Pd 2+ Concentration is 0.006g / ml), CuCl 2 Solution (Cu 2+ The concentration is 0.002g / ml) by adding TiO 2 middle. The mixture was evaporated to dryness in a water bath at 373K; 2Under the conditions of 500 ° C reduction for 6h. That is, Pd(7%)-Cu(3.5%)-TiO is obtained 2 .

[0042] The photocatalytic simultaneous degradation of benzene and nitrate is the same as in Example 1. The degradation rate of benzene is 100%, and the degradation rate of nitrate is 30.7%.

[0043] It can be seen that if the metal loading is too high, the active sites on the surface of titanium dioxide will be reduced, which is not conducive to the photocatalytic degradation efficiency of nitrate.

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Abstract

The invention discloses a catalyst which can optically catalyze and degrades benzene and nitrate, a preparation method and application of the catalyst. The catalyst is dual-metal A-B-TiO2-typed catalyst carried by TiO2; wherein, metal A is Pd, Pt or Au; metal B is Cu, Ag or Ni. The preparation method comprises the steps as follows: TiO2 is added into solution of A salt or B salt, dipped and dried by steaming; the catalyst is subsequently gained by a reduction method under the conditions of H2 and high temperature. The invention takes TiO2 carried by dual metals as catalyst; when the optical catalysis is carried out, the benzene and nitrate pollutant in water can be degraded; the operation is simple, the raw material is easily gained, furthermore, the catalyst has no secondary pollution, the disposal effect is obvious and the catalyst has wide application prospect in micro-polluted water disposal field.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and noble metal loading, in particular to a bimetallic loaded photocatalyst and its application in simultaneously degrading benzene and nitrate Background technique [0002] With the acceleration of economic development and urbanization, the fresh water resources that human beings rely on for survival are being increasingly damaged. As an important part of available fresh water resources, groundwater is playing a pivotal role and is also suffering from serious pollution, which has caused groundwater to lose some or all of its functions, making groundwater resources more and more scarce. The problems faced by my country's groundwater mainly come from groundwater overexploitation and groundwater pollution. Groundwater pollution mainly includes high hardness, heavy metal pollution, nitrate pollution and petroleum hydrocarbon (benzene series) pollution. [0003] The nitrate pollution of ground...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/38A62D3/10C02F1/30B01J21/06A62D101/20
Inventor 郑寿荣李丽媛许昭怡刘凤玲顾浩王家宏邵芸穆容心邢涛刘景亮赵瑞东唐玉琼韩玉香唐亮宗恩敏
Owner NANJING UNIV
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