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Attapulgite loaded quasi-one-dimensional titanium dioxide composite photocatalyst and preparation method thereof

A technology of attapulgite and titanium dioxide, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of difficult separation and recovery, difficult dispersion, easy agglomeration, etc., and achieve the effect of recycling and reusing and avoiding agglomeration

Inactive Publication Date: 2014-02-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the technical problems existing in the prior art, the present invention aims to solve the technical defects of the traditional suspension system nano-titanium dioxide photocatalyst, which is easy to agglomerate, difficult to disperse, low photocatalytic efficiency, and difficult to separate and recover after photodegradation, and provides a concave-convex Pyrolith-loaded quasi-one-dimensional titanium dioxide composite photocatalyst and its preparation method can make nano-scale TiO with quasi-one-dimensional pine needle-like morphology 2 Evenly dispersed on the attapulgite surface, avoiding TiO 2 Agglomeration of particles, so there will be no TiO due to agglomeration 2 The reduction of the specific surface area of ​​the photocatalyst and the problem of photocatalytic performance degradation

Method used

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  • Attapulgite loaded quasi-one-dimensional titanium dioxide composite photocatalyst and preparation method thereof
  • Attapulgite loaded quasi-one-dimensional titanium dioxide composite photocatalyst and preparation method thereof
  • Attapulgite loaded quasi-one-dimensional titanium dioxide composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Prepare 50mL of attapulgite deionized water suspension I with a concentration of 20g / L and uniformly dispersed in a beaker.

[0035] 2. Under the conditions of ice-water bath and 200r / min magnetic stirring, 2.8ml of 98% TiCl 4 Add the solution dropwise to 10ml of sulfuric acid solution with a concentration of 20%, and then add deionized water to prepare 250ml of TiCl with a concentration of 0.1mol / L 4 aqueous solution.

[0036]3. Use 10% dilute sulfuric acid to adjust the pH value of the suspension I in step 1 to 2.5, place the beaker in a constant temperature water bath at 85°C, maintain mechanical stirring at 300r / min, and add 20g of urea as a slow-release agent to obtain Suspension II.

[0037] 4. Immediately add the 0.1mol / L TiCl mentioned in step 2 dropwise at a speed of 1ml / min 4 Aqueous solution enters in the suspension II described in step 3, to TiCl 4 After all the aqueous solution is added dropwise, continue to maintain mechanical stirring at 300r / min i...

Embodiment 2

[0040] 1. Prepare 50mL of attapulgite deionized water suspension with a concentration of 20g / L and uniformly dispersed attapulgite, add 50mL of concentrated hydrochloric acid (commercial grade product with a concentration of 37.5%) under stirring conditions, let stand for 12 hours, and then centrifuge and collect Solid phase, the obtained solid phase was alternately washed with deionized water and absolute ethanol until the pH value was 3.5, and a uniformly dispersed suspension I with a concentration of 20 g / L was prepared with deionized water.

[0041] 2. Under the conditions of ice-water bath and 200r / min magnetic stirring, 2.8ml of 98% TiCl 4 Add the solution dropwise to 10ml of sulfuric acid solution with a concentration of 20%, and then add deionized water to prepare 250ml of TiCl with a concentration of 0.1mol / L 4 aqueous solution.

[0042] 3. Use 10% dilute sulfuric acid to adjust the pH value of the suspension I in step 1 to 2.5, place the beaker in a constant tempera...

Embodiment 3

[0046] 1. Prepare 50mL of attapulgite deionized water suspension with a concentration of 20g / L and uniformly dispersed attapulgite, add 50mL of concentrated hydrochloric acid (commercial grade product with a concentration of 37.5%) under stirring conditions, let stand for 12 hours, and then centrifuge and collect Solid phase, the obtained solid phase was alternately washed with deionized water and absolute ethanol until the pH value was 4.5, and a uniformly dispersed suspension I with a concentration of 20 g / L was prepared with deionized water.

[0047] 2. Under the conditions of ice-water bath and 200r / min magnetic stirring, 2.8ml of 98% TiCl 4 Add the solution dropwise to 10ml of sulfuric acid solution with a concentration of 20%, and then add deionized water to prepare 250ml of TiCl with a concentration of 0.1mol / L 4 aqueous solution.

[0048] 3. Use 10% dilute sulfuric acid to adjust the pH value of the suspension I in step 1 to 2.5, place the beaker in a constant tempera...

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Abstract

The invention relates to the technical fields of nano-materials and photocatalysis, in particular to an attapulgite loaded quasi-one-dimensional titanium dioxide composite photocatalyst and a preparation method thereof. The carrier of the composite photocatalyst is attapulgite, and pine needle shaped nano-scale titanium dioxide particles are uniformly distributed on the surface of the attapulgite. The preparation method includes hydrolytic precipitation loading of nano-titanium dioxide and subsequent heat treatment processes. The composite photocatalyst provided by the invention is prepared by a hydrolytic precipitation loading technique. Attapulgite is taken as the carrier to make the quasi-one-dimensional nano-TiO2 particles fixed on the surface to form a stable TiO2 / attapulgite photocatalyst. The quasi-one-dimensional pine needle shaped nano-scale iO2 particles are uniformly distributed on the surface of the attapulgite, so that agglomeration of TiO2 particles can be avoided, and the problems of TiO2 photocatalyst specific surface area decrease and photocatalytic performance degradation caused by the agglomeration effect cannot appear. At the same time, without additional equipment and energy consumption, recovery and reuse of the photocatalyst can be realized.

Description

technical field [0001] The invention relates to the technical field of nanometer materials and photocatalysis, in particular to an attapulgite-loaded quasi-one-dimensional titanium dioxide composite photocatalyst and a preparation method thereof. Background technique [0002] The application of photocatalytic technology in the degradation of pollutants has become one of the research hotspots in the field of environmental protection in various countries. Among many semiconductor photocatalysts, nano-titanium dioxide TiO 2 It has attracted much attention because of its outstanding advantages such as non-toxic, low cost, stable chemical properties, high catalytic efficiency, no secondary pollution, and wide application range. Nano-TiO 2 There are two main forms of photocatalyst use, that is, the direct use of nano-TiO 2 A suspension system in which particles are suspended in a solution for catalytic reactions and nano-TiO 2 A support system that is supported on a carrier su...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J37/02
Inventor 汪冬梅吕珺吴玉程郑治祥
Owner HEFEI UNIV OF TECH
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