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Preparation method of photocatulyzed active bromine adulerated titanium dioxide nano-material

A photocatalytic activity, titanium dioxide technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., to achieve the effect of simple preparation method and high light quantum efficiency

Inactive Publication Date: 2006-05-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching the literature, it was found that there is no related preparation method of bromine-doped titanium dioxide nanomaterials.

Method used

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  • Preparation method of photocatulyzed active bromine adulerated titanium dioxide nano-material

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Experimental program
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Effect test

Embodiment 1

[0026] 15ml of bromine aqueous solution (3% by mass) was reacted with 10ml of tetrabutyl titanate (>98.0% by mass) until a white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 8 hours, evaporated to remove water and alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 320° C. for 2 hours to obtain a bromine-doped titanium dioxide nano-catalyst material with high catalytic activity under visible light. In the catalytic activity test, the first-order reaction kinetics apparent rate constant k=6.86×10 of the catalyst material catalyzes the degradation of phenol -3 min -1, is titanium dioxide powder (P25, Degussa) first-order reaction kinetics apparent rate constant k=1.04×10 -3 min -1 It can be seen that after heat treatment for 2 hours, bromine-do...

Embodiment 2

[0029] 15ml of bromine aqueous solution (3% by mass) was reacted with 10ml of titanium sulfate (>40.0% by mass) until a white precipitate was completely formed. Rinse the resulting white precipitate with deionized water until the anion (sulfate ion) concentration is less than 0.5 mg / L. It was then filtered to collect the precipitated material washed with deionized water. The white precipitate was directly heated in an oven, treated at 120°C for 8 hours, evaporated to remove water and alcohols produced in the reaction to obtain a solid dry product. Then grind the dry solid to make the particles uniform and reduce soft agglomeration. Then it is placed in a muffle furnace and calcined at 350° C. for 2 hours to obtain a bromine-doped titanium dioxide nanometer material with high catalytic activity under visible light. In the catalytic activity test, the first-order reaction kinetics apparent rate constant k=5.41×10 of the catalyst material catalyzes the degradation of phenol -3...

Embodiment 3

[0031] 10 ml of hydrogen bromide solution (2 mol / L) was reacted with 10 ml of tetrabutyl titanate (mass percentage>98.0%) until a white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 8 hours, evaporated to remove water and alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 350° C. for 2 hours to obtain bromine-doped titanium dioxide nanomaterials with high catalytic activity under visible light. In the catalytic activity test, the first-order reaction kinetics apparent rate constant k=5.72×10 of the catalyst material catalyzes the degradation of phenol -3 min -1 , is titanium dioxide powder (P25, Degussa) first-order reaction kinetics apparent rate constant k=1.04×10 -3 min -1 5.5 times. It can be seen that after heat treatment for 2 hours, b...

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Abstract

The invention discloses a preparation method of a photocatalytically active bromine-doped titanium dioxide nanometer material, which belongs to the field of inorganic nanometer photocatalytic materials. The method adopts the bromine doping technology to synthesize the bromine doped modified titanium dioxide nanometer material, and introduces bromine element into the crystal of the titanium dioxide. The weight percentages of the three elements in the bromine-doped titanium dioxide nanometer material are as follows: the content of titanium accounts for 48%-73%, the content of oxygen accounts for 26.9%-42%, and the content of bromine accounts for 0.1%-10%. The bromine-doped titanium dioxide nano-catalyst material prepared by the preparation method of the present invention has a band gap that can also be excited by visible light irradiation, realizes full-frequency absorption of visible light, and can significantly improve the TiO 2 The light quantum efficiency of the material; at the same time, the preparation method is simple and has the prospect of industrial production.

Description

technical field [0001] The invention relates to a preparation method of a nanometer material, in particular to a preparation method of a photocatalytically active bromine-doped titanium dioxide nanometer material, which belongs to the field of inorganic nanometer photocatalytic materials. Background technique [0002] Titanium dioxide semiconductor photocatalytic oxidation technology is a new type of modern technology. Because it can widely utilize natural energy—solar energy, and has outstanding features such as low energy consumption, mild reaction conditions, easy operation, and can reduce secondary pollution, it has attracted increasing attention and has broad application prospects. In recent years, semiconductor photocatalysis has become one of the research hotspots in the field of photochemistry and environmental protection, and its application in wastewater treatment has been reported in many literatures. A large number of studies have confirmed that dyes, surfactant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/06C01G23/047
Inventor 蔡伟民徐俊王正鹏
Owner SHANGHAI JIAO TONG UNIV
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