Method for preparing acidification stripped vermiculite supported TiO2 photocatalyst

A photocatalyst and vermiculite technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficult separation and recycling, and achieve easy separation and recycling, low preparation cost, The effect of improving utilization

Inactive Publication Date: 2014-04-16
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to, in order to solve TiO 2 It is difficult to separate and recycle photocatalysts in the practical application of photocatalytic degradation of organic pollutants, and to provide an acidification exfoliation vermiculite loaded TiO 2 photocatalytic method

Method used

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  • Method for preparing acidification stripped vermiculite supported TiO2 photocatalyst
  • Method for preparing acidification stripped vermiculite supported TiO2 photocatalyst
  • Method for preparing acidification stripped vermiculite supported TiO2 photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Sieve the vermiculite to 200 meshes, add 30% of the mass fraction into the 1mol / L hydrochloric acid solution, react for 6 hours, filter and wash to neutrality, and dry the filter cake at a temperature of 60°C for 12 hours. Grinding to obtain acidified exfoliated vermiculite, the acidified exfoliated vermiculite is a completely exfoliated lamellar structure with a surface rich in silanol;

[0027] b. Disperse 0.283 g of acidified exfoliated vermiculite in step a in 100 mL of deionized water, add 0.02 mol hydrochloric acid, and cool down to 1 °C;

[0028]c, tetra-n-butyl titanate is mixed with analytical pure ethanol solvent in a molar ratio of 1:30, and added to the acid solution containing acidified exfoliated vermiculite in step b to obtain [Ti] / [H + ] The molar ratio is 1: 2, the ratio of tetra-n-butyl titanate and acidified exfoliated vermiculite is the mixture of 35mmol / g, and the mixture is transferred to the reactor after continuing to stir for 3 hours at a tem...

Embodiment 2

[0042] a. Pass the vermiculite through a 300 mesh sieve, add 40% by mass fraction into a 2.5mol / L sulfuric acid solution, react for 6 hours, filter and wash until neutral, and dry the filter cake at a temperature of 100°C for 8 hours, The acidified exfoliated vermiculite is obtained by grinding, and the acidified exfoliated vermiculite is a completely exfoliated lamellar structure with a surface rich in silicon hydroxyl groups;

[0043] b. Disperse 0.331 g of acidified exfoliated vermiculite in step a in 50 mL of deionized water, add 0.03 mol hydrochloric acid, and cool down to 0.2 °C;

[0044] c, tetra-n-butyl titanate is mixed with analytical pure isopropanol solvent in a molar ratio of 1:35, and added to the acid solution containing acidified exfoliated vermiculite in step b to obtain [Ti] / [H + ] Molar ratio is 1: 3, the ratio of tetra-n-butyl titanate and acidified exfoliated vermiculite is the mixture of 30mmol / g, this mixture is transferred in the reaction kettle after c...

Embodiment 3

[0048] a. Pass the vermiculite through a 300 mesh sieve, add 20% by mass fraction into a 1.5mol / L phosphoric acid solution, react for 8 hours, filter and wash until neutral, and dry the filter cake at a temperature of 80°C for 8 hours, The acidified exfoliated vermiculite is obtained by grinding, and the acidified exfoliated vermiculite is a completely exfoliated lamellar structure with a surface rich in silicon hydroxyl groups;

[0049] b. Disperse 0.397 g of acidified exfoliated vermiculite in step a in 80 mL of deionized water, add 0.04 mol of hydrochloric acid, and cool down to 3 °C;

[0050] c, tetraisopropyl titanate is mixed with analytical pure ethanol solvent in a molar ratio of 1:10, and added to the acid solution containing acidified exfoliated vermiculite in step b to obtain [Ti] / [H + ] Molar ratio is 1: 4, the ratio of tetraisopropyl titanate and acidified exfoliated vermiculite is the mixture of 25mmol / g, this mixture is transferred in the reaction kettle after c...

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Abstract

The invention relates to a method for preparing an acidification stripped vermiculite supported TiO2 photocatalyst. Cheap acidification stripped vermiculite lamina are used as a support, and a TiO2 photocatalyst is supported on the laminar surface of the acidification stripped vermiculite, so that the organic pollutants are treated by integrated adsorption-photocatalysis, and the catalyst is easy to separate and recycle. The simple acid treatment is utilized to obtain the large-specific-area acidification stripped vermiculite lamina containing rich hydroxyl groups on the surface; and the acidification stripped vermiculite supported TiO2 photocatalyst is synthesized by a simple hydrothermal method by using the acidification stripped vermiculite as the support of the TiO2 nano photocatalyst. The method is simple and low in cost; the obtained supported TiO2 photocatalyst is a TiO2 nanoparticle lamina of which the acidification stripped vermiculite laminar surface grows uniformly and orderly and forms a flat porous sponge; and the supported TiO2 photocatalyst has large specific area and high photocatalytic activity, is convenient for treating organic pollutants by integrated adsorption-photocatalysis, is easy to separate and recycle, and can be widely used for environmental treatment, such as purifying treatment of wastewater, sewage, indoor / outdoor gas contamination and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic materials and treatment of environmental pollutants, in particular to a method for preparing acidified exfoliated vermiculite loaded TiO 2 The photocatalyst method, the prepared catalyst is a green photocatalyst that can efficiently and stably realize the integrated treatment of organic pollutants by adsorption-photocatalysis and is easy to separate and recycle. It is mainly used in environmental treatment, such as waste water, sewage, indoor Purification treatment such as external gas pollution. Background technique [0002] Photocatalytic oxidation technology has the characteristics of simple equipment, mild and controllable reaction conditions, and strong mineralization ability. It has broad application prospects in low-concentration biodegradable organic pollutants and air purification. In water treatment applications, traditional photocatalytic reactions are mostly carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/16C02F1/30
Inventor 王兰王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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