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

Abstract

A Br doped nano TiO2 material with photocatyletic activity is prepared by introducing Br to TiO2 crystal. It contains Ti (48-73 wt.%), O (26.9-42) and Br (0.1-10). Its energy gap can be triggered by visual light, so realizing full-frequency absorption of visual light and increasing the light quantum efficiency of TiO2 material.

Description

Technical field

[0001] The invention relates to a method for preparing nano materials, in particular to a method for preparing photocatalytically active bromine-doped titanium dioxide nano materials, and 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 make extensive use of natural energy-solar energy, and has the outstanding characteristics of low energy consumption, mild reaction conditions, easy operation, and reduction of 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 documents. A large number of studies have confirmed that dyes, surfactants, organi...

Examples

Embodiment 1

[0027]15ml of bromine aqueous solution (with a mass percentage of 3%) and 10ml of tetrabutyl titanate (with a mass percentage of >98.0%) were reacted until a white precipitate was completely formed. The white precipitate is directly heated in an oven, treated at 120°C for 8 hours, and evaporated to remove water and alcohols produced during the reaction to obtain a solid dry product. Grind the obtained solid dry matter to make the particles uniform and reduce soft agglomeration. After grinding, it is placed in a muffle furnace and calcined 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 apparent rate constant of the first-order reaction kinetics of the catalytic degradation of phenol by the catalyst material is k=6.86×10 -3 min -1 , Is the apparent rate constant of first order reaction kinetics of titanium dioxide powder (P25, Degussa) k = 1.04×10 -3 min -1 I...

Embodiment 2

[0030] 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. After washing the generated white precipitate with deionized water, until the anion (sulfate ion) concentration is less than 0.5 mg / L. Then it is filtered to collect the precipitated material washed with deionized water. The white precipitate is directly heated in an oven, treated at 120°C for 8 hours, and evaporated to remove water and alcohols produced during the reaction to obtain a solid dry product. Grind the dry solids 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 nanomaterial with high catalytic activity under visible light. In the catalytic activity test, the first-order reaction kinetics apparent rate constant of the catalytic degradation of phenol by the catalyst material is k=5.41×10 ...

Embodiment 3

[0032] 10ml of hydrogen bromide solution (2mol / L) and 10ml of tetrabutyl titanate (mass percentage> 98.0%) are reacted until a white precipitate is completely formed. The white precipitate is directly heated in an oven, treated at 120°C for 8 hours, and evaporated to remove water and alcohols produced during the reaction to obtain a solid dry product. Grind the obtained solid dry matter to make the particles uniform and reduce soft agglomeration. After grinding, it is placed in a muffle furnace and calcined at 350° C. for 2 hours to obtain a bromine-doped titanium dioxide nanomaterial with high catalytic activity under visible light. In the catalytic activity test, the apparent rate constant of the first-order reaction kinetics of the catalytic degradation of phenol is k=5.72×10 -3 min -1 , Is the apparent rate constant of first order reaction kinetics of titanium dioxide powder (P25, Degussa) k = 1.04×10 -3 min -1 5.5 times. It can be seen that after 2 hours of heat treatment, a ...

Technical field

[0001] The invention relates to a method for preparing nano materials, in particular to a method for preparing photocatalytically active bromine-doped titanium dioxide nano materials, and 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 make extensive use of natural energy-solar energy, and has the outstanding characteristics of low energy consumption, mild reaction conditions, easy operation, and reduction of 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 documents. A large number of studies have confirmed that dyes, surfactants, organi...

Examples

Embodiment 1

[0027]15ml of bromine aqueous solution (with a mass percentage of 3%) and 10ml of tetrabutyl titanate (with a mass percentage of >98.0%) were reacted until a white precipitate was completely formed. The white precipitate is directly heated in an oven, treated at 120°C for 8 hours, and evaporated to remove water and alcohols produced during the reaction to obtain a solid dry product. Grind the obtained solid dry matter to make the particles uniform and reduce soft agglomeration. After grinding, it is placed in a muffle furnace and calcined 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 apparent rate constant of the first-order reaction kinetics of the catalytic degradation of phenol by the catalyst material is k=6.86×10 -3 min -1 , Is the apparent rate constant of first order reaction kinetics of titanium dioxide powder (P25, Degussa) k = 1.04×10 -3 min -1 I...

Embodiment 2

[0030] 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. After washing the generated white precipitate with deionized water, until the anion (sulfate ion) concentration is less than 0.5 mg / L. Then it is filtered to collect the precipitated material washed with deionized water. The white precipitate is directly heated in an oven, treated at 120°C for 8 hours, and evaporated to remove water and alcohols produced during the reaction to obtain a solid dry product. Grind the dry solids 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 nanomaterial with high catalytic activity under visible light. In the catalytic activity test, the first-order reaction kinetics apparent rate constant of the catalytic degradation of phenol by the catalyst material is k=5.41×10 ...

Embodiment 3

[0032] 10ml of hydrogen bromide solution (2mol / L) and 10ml of tetrabutyl titanate (mass percentage> 98.0%) are reacted until a white precipitate is completely formed. The white precipitate is directly heated in an oven, treated at 120°C for 8 hours, and evaporated to remove water and alcohols produced during the reaction to obtain a solid dry product. Grind the obtained solid dry matter to make the particles uniform and reduce soft agglomeration. After grinding, it is placed in a muffle furnace and calcined at 350° C. for 2 hours to obtain a bromine-doped titanium dioxide nanomaterial with high catalytic activity under visible light. In the catalytic activity test, the apparent rate constant of the first-order reaction kinetics of the catalytic degradation of phenol is k=5.72×10 -3 min -1 , Is the apparent rate constant of first order reaction kinetics of titanium dioxide powder (P25, Degussa) k = 1.04×10 -3 min -1 5.5 times. It can be seen that after 2 hours of heat treatment, a ...

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