Photocatalyst for efficient degradation of organic dye, and preparation method thereof

A photocatalyst and organic dye technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high photo-generated carrier recombination rate, low utilization efficiency of sunlight, affecting photocatalytic efficiency, etc. , to achieve the effect of high photodegradation efficiency, preventing agglomeration inactivation and high purity

Inactive Publication Date: 2013-06-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, due to TiO 2 The band gap is about 3.2eV, and it can only absorb ultraviolet light with a wavelength less than 385nm, making TiO 2 Very inefficient use of sunlight
Second, the recombination rate of photogenerated carriers (electrons and holes) is high, resulting in a decrease in quantum efficiency and affecting photocatalytic efficiency
Third, TiO in the suspension system 2 Nanopowder is prone to agglomeration and deactivation, and it is difficult to recover and recycle after the reaction

Method used

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  • Photocatalyst for efficient degradation of organic dye, and preparation method thereof
  • Photocatalyst for efficient degradation of organic dye, and preparation method thereof
  • Photocatalyst for efficient degradation of organic dye, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A highly efficient photocatalyst for degrading organic dyes, with a structural expression of Bi-TiO 2 / SBA-15, its preparation method comprises the following steps:

[0031]In the first step, 1.2mL of tetrabutyl titanate was dissolved in absolute ethanol solution, stirred for 1h at a stirring rate of 500r / min to dissolve, and then 0.4g of mesoporous molecular sieve SBA-15 was weighed and added to the above In the solution, stirring for 1h at a stirring rate of 500r / min, the TiO 2 / SBA-15 mixed solution, wherein the volume ratio of tetrabutyl titanate and absolute ethanol solution is 1: 2.0;

[0032] In the second step, 0.0082g of bismuth nitrate was dissolved in 10mL of pure water and stirred for 0.5h at a stirring rate of 200r / min to obtain a solid-liquid mixture containing Bi;

[0033] In the third step, the solid-liquid mixture prepared in step 2 is added to the mixed solution prepared in step 1, and the mixed solution of 16.0mL citric acid, polyethylene glycol and...

Embodiment 2

[0037] A highly efficient photocatalyst for degrading organic dyes, with a structural expression of Bi-TiO 2 / SBA-15, its preparation method comprises the following steps:

[0038] In the first step, dissolve 1.2mL of tetrabutyl titanate in absolute ethanol solution, stir for 0.5-1h at a stirring rate of 500r / min to dissolve, then weigh 0.6g of mesoporous molecular sieve SBA-15, add into the above solution, and stirred for 0.5 to 1 h at a stirring rate of 600 r / min to obtain TiO 2 / SBA-15 mixed solution, wherein the volume ratio of tetrabutyl titanate and absolute ethanol solution is 1: 3.3;

[0039] In the second step, 0.0082g of bismuth nitrate is dissolved in 20mL of pure water and stirred for 0.3h at a stirring rate of 500r / min, and nitric acid is added at the same time. The volume ratio of pure water to the added nitric acid is 60:1 to inhibit The hydrolysis of bismuth nitrate obtains a solid-liquid mixture containing Bi;

[0040] In the third step, the solid-liquid mi...

Embodiment 3

[0044] A highly efficient photocatalyst for degrading organic dyes, with a structural expression of Bi-TiO 2 / SBA-15, its preparation method comprises the following steps:

[0045] In the first step, 1.2 mL of tetrabutyl titanate was dissolved in absolute ethanol solution, stirred for 0.8 h at a stirring rate of 450 r / min to dissolve, and then 0.5 g of mesoporous molecular sieve SBA-15 was weighed and added to In the above solution, stir for 0.58h under the condition that the stirring rate is 550r / min, and the solution containing TiO 2 / SBA-15 mixed solution, wherein the volume ratio of tetrabutyl titanate and absolute ethanol solution is 1:3;

[0046] In the second step, 0.016g of bismuth nitrate is dissolved in 15mL of pure water and stirred for 0.35h at a stirring rate of 500r / min, and nitric acid is added at the same time. The volume ratio of pure water to the added nitric acid is 50:1 to inhibit The hydrolysis of bismuth nitrate obtains a solid-liquid mixture containing...

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Abstract

The present invention discloses a photocatalyst for efficient degradation of organic dyes. The preparation method of the photocatalyst comprises the following steps: 1, dissolving 1.2 mL of tetrabutyl titanate in a dehydrated alcohol solution, weighing 0.4-0.6 g of mesoporous molecular sieve SBA-15, adding the mesoporous molecular sieve SBA-15 to the tetrabutyl titanate-containing dehydrated alcohol solution; 2, dissolving 0.0082-0.066 g of bismuth nitrate in 10-20 mL of purified water to obtain a solid-liquid mixture; 3, mixing the resulting solutions from the step 1 and the step 2, adding 8.0-16.0 mL of a mixing solution comprising citric acid, polyethylene glycol and an emulsifying agent in a dropwise manner to obtain a Bi-containing emulsus material; 4, carrying out suction filtrationand washing for the Bi-containing emulsus material by dehydrated alcohol, then drying and baking to obtain the Bi-TiO2 / SBA-15 photocatalyst. In the steps of the method, the tetrabutyl titanate, the dehydrated alcohol, the citric acid, the polyethylene glycol and the emulsifying agent are the analytically pure materials. The product prepared by the method of the present invention has characteristics of high purity, good adsorption performance and high photodegradation efficiency. In addition, the price of the raw materials of the present invention is low, the process is simple, the equipment is simple, and the photocatalyst of the present invention is a novel adsorbent material with the development potential.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a photocatalyst for efficiently degrading organic dyes and a preparation method thereof. Background technique [0002] With the improvement of the modernization of industrial technology, while enjoying the comfort and convenience brought by the rapid development of science and technology, human beings are also suffering from the disaster of deteriorating living environment caused by blindness and short-sightedness. The potential impact of environmental pollution seriously threatens the continued reproduction and survival of human beings. Therefore, sewage treatment and air purification have become important research contents for scientific researchers in various countries. How to effectively remove toxic substances such as surfactants, dyes, and heavy metal ions in industrial wastewater, as well as organic waste gases and toxic gases in the atmosphere, has become a hot topic in various researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03C02F1/30
CPCY02W10/37
Inventor 马晶薛娟琴毕强李国平
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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