Method for PVP assisted preparation of flower-like BiOBr/sepiolite composite catalyst and application of composite catalyst

A technology of composite catalyst and sepiolite, which is applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of no composite photocatalyst of sepiolite and BiOBr, so as to improve the photocatalytic ability , Good dispersibility, and the effect of improving stability

Active Publication Date: 2016-12-07
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the composite photocatalyst of sepiolite and BiOBr

Method used

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  • Method for PVP assisted preparation of flower-like BiOBr/sepiolite composite catalyst and application of composite catalyst
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  • Method for PVP assisted preparation of flower-like BiOBr/sepiolite composite catalyst and application of composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Sepiolite pretreatment: Soak the raw sepiolite soil in distilled water, wash with distilled water several times, filter until the pH is neutral, dry in an oven, grind, and sieve for later use.

[0035] 2) Add the purified sepiolite to a concentration of 1.5mol L -1 hydrochloric acid solution, so that the solid-to-liquid ratio is 1g:7mL, soak, wash, suction filter, and dry.

[0036] 3) Calcining the acid-treated sepiolite at a rate of 5° C. / min to 400° C. for 3 hours, and passing through a 80-mesh sieve after cooling to obtain modified sepiolite.

[0037] 4) Weigh 25 mg of modified sepiolite and place it in 60 mL of ethylene glycol solvent, and disperse it by ultrasonication for 1 hour to obtain a suspension. Add 0.15gPVP and 3mmolBi(NO 3 ) 3 ·5H 2 O, stirred for 12h. Add an equal proportion of NH to the suspension 4 Br, stirred for 1 h, the solution was uniformly dispersed and transferred to a 100 mL reactor, reacted at 150 °C for 12 h, cooled to room temperatu...

Embodiment 2

[0039] 1)~3) The preparation method of modified sepiolite is the same as the preparation method of modified sepiolite in Example 1.

[0040] 4) Weigh 50 mg of modified sepiolite, place it in 60 mL of ethylene glycol solvent, and disperse it by ultrasonication for 1 hour to obtain a suspension. Add 0.15gPVP and 3mmolBi(NO 3 ) 3 ·5H 2 O, stirred for 12h. Add an equal proportion of NH to the suspension 4 Br, stirred for 1 h, the solution was uniformly dispersed and transferred to a 100 mL reactor, reacted at 160 °C for 12 h, cooled to room temperature, washed with ethanol and deionized water alternately, and dried at 60 °C to obtain a flower-shaped BiOBr / sepiolite composite catalyst.

Embodiment 3

[0042] 1) Sepiolite pretreatment: Soak the raw sepiolite soil in distilled water, wash with distilled water several times, filter until the pH is neutral, dry in an oven, grind, and sieve for later use.

[0043] 2) Add the purified sepiolite to a concentration of 1.2mol L -1 hydrochloric acid solution, so that the solid-to-liquid ratio is 1g:5mL, soak, wash, suction filter, and dry.

[0044] 3) The acid-treated sepiolite was calcined at a rate of 8°C / min at a temperature of 400°C for 2 hours, cooled and sieved with 80 meshes to obtain modified sepiolite.

[0045] 4) Weigh 100 mg of modified sepiolite and place it in 60 mL of ethylene glycol solvent, and disperse it by ultrasonication for 1 hour to obtain a suspension. Add 0.15gPVP and 3mmolBi(NO 3 ) 3 ·5H 2 O, stirred for 12h. Add an equal proportion of NH to the suspension 4 Br, stirred for 1 h, the solution was uniformly dispersed and transferred to a 100 mL reactor, reacted at 160 °C for 12 h, cooled to room temperatu...

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Abstract

The invention discloses a method for preparing a flower-like BiOBr/sepiolite composite catalyst assisted by PVP and the application of the composite catalyst. The method is to soak the sepiolite in an inorganic acid solution and then perform a calcining treatment to obtain a modified seafoam Foaming stone: Disperse the modified sepiolite in an organic solvent to obtain a suspension; add PVP, bismuth nitrate and ammonium bromide salt to the suspension and stir evenly to obtain a dispersion; the dispersion is transferred to a high-pressure reactor In the solvothermal reaction, the flower-like BiOBr/sepiolite composite catalyst with high photocatalytic activity, good dispersion and uniform size is obtained. This catalyst is used to catalyze rhodamine b, which has the characteristics of fast and efficient The preparation method has the advantages of simple steps, convenient operation, readily available raw materials and low cost.

Description

technical field [0001] The invention relates to a BiOBr photocatalyst, in particular to the preparation of a flower-shaped BiOBr / sepiolite composite catalyst and the application of the flower-shaped BiOBr / sepiolite composite catalyst in photocatalytic degradation of rhodamine b, belonging to the field of photocatalysts. Background technique [0002] With the rapid development of industrialization, the problem of industrial pollution has attracted great attention all over the world. Due to the utilization of renewable sunlight as an energy source, the potential application of photocatalysts in wastewater treatment has attracted widespread attention in recent years. [0003] At present, BiOBr, as a new type of semiconductor photocatalyst, exhibits a certain photocatalytic degradation of pollutants due to its unique layered structure, large specific surface area, and suitable valence band position, and has a certain visible light response range. However, single-phase BiOBr is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/38
CPCY02W10/37B01J27/06B01J35/004C02F1/30C02F2101/308C02F2101/38C02F2305/10
Inventor 汪形艳杨秋月戴友芝刘林汤敏金显明
Owner XIANGTAN UNIV
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