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Preparation method of mesoporous molecular sieve (MMS)-loaded S2O8<2->/TiO2 visible-light-induced photocatalyst

A mesoporous molecular sieve and visible light technology, which is applied in the preparation of catalysts and the preparation of nano-titanium dioxide, can solve the problems of low surface reaction rate, limiting the practical application of titanium dioxide, and low quantum efficiency.

Inactive Publication Date: 2013-10-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the photocatalysis of conventional titanium dioxide, its photogenerated electrons and holes recombine in a very short time, resulting in low quantum efficiency and low surface reaction rate; in addition, conventional titanium dioxide requires ultraviolet light with a wavelength of less than 387nm to act. to photocatalysis; this greatly limits the practical application of titania

Method used

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  • Preparation method of mesoporous molecular sieve (MMS)-loaded S2O8&lt;2-&gt;/TiO2 visible-light-induced photocatalyst
  • Preparation method of mesoporous molecular sieve (MMS)-loaded S2O8&lt;2-&gt;/TiO2 visible-light-induced photocatalyst

Examples

Experimental program
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Embodiment 1

[0010] Example 1: S 2 o 8 2- / TiO 2 -Synthesis of MCM-41

[0011] (1) TiO 2 -Synthesis of MCM-41

[0012] Add 1g of MCM-41 to 0.1mol / L of 300mL TiCl 4 aqueous solution, and adjust the pH to 9-10 with 0.5 mol / L ammonia water, stir and impregnate at room temperature for 6 hours, and then dry to obtain TiO 2 Loaded MCM-41 mesoporous molecular sieves.

[0013] (2)S 2 o 8 2- / TiO 2 -Synthesis of MCM-41

[0014] 1g TiO 2 - Add MCM-41 into 15mL of 0.5mol / L ammonium persulfate, stir and impregnate for 6h, then filter and dry at 60°C. Finally, it was calcined at 500°C for 5 hours to obtain the highly efficient visible light catalyst S 2 o 8 2- / TiO 2 -MCM-41.

Embodiment 2

[0015] Example 2: S 2 o 8 2- / TiO 2 -Synthesis of SBA-15

[0016] (1) TiO 2 -Synthesis of SBA-15

[0017] Add 1g of SBA-15 to 0.1mol / L of 300mL TiCl 4 aqueous solution, and adjust the pH to 9-10 with 0.5 mol / L ammonia water, stir and impregnate at room temperature for 6 hours, and then dry to obtain TiO 2 Loaded SBA-15 mesoporous molecular sieves.

[0018] (2)S 2 o 8 2- / TiO 2 -Synthesis of SBA-15

[0019] 1g TiO 2 - Add SBA-15 into 15mL of 0.5mol / L ammonium persulfate, stir and impregnate for 6h, then filter and dry at 60°C. Finally, calcining at 600°C for 6 hours can obtain the catalyst S with high-efficiency visible light catalytic degradation 2 o 8 2- / TiO 2 -SBA-15.

[0020] Two, S 2 o 8 2- / TiO 2 - MCM-41 Photocatalytic Degradation of Rhodamine B Experiment

[0021] The photocatalytic activity of the prepared samples was evaluated by photocatalytic degradation of Rhodamine B solution under visible light. 0.1g catalyst S 2 o 8 2- / TiO 2 - Dispe...

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Abstract

The invention provides a preparation method of a mesoporous molecular sieve (MMS)-loaded S2O8<2-> / TiO2 visible-light-induced photocatalyst and a use of the MMS-loaded S2O8<2-> / TiO2 visible-light-induced photocatalyst in photocatalytic degradation of rhodamine B. The preparation method comprises the following steps of dipping the MMS as a carrier into a titanium salt aqueous solution, adjusting a pH value by ammonia water, carrying out stirring aging at a room temperature, carrying out washing and drying, carrying out immersion by an ammonium persulfate solution, carrying out filtration and drying, and carrying out calcination to obtain S2O8<2-> / TiO2-MMS. The MMS-loaded S2O8<2-> / TiO2 visible-light-induced photocatalyst has a capability of high-efficiency photocatalytic degradation of rhodamine B in visible light. The preparation method belongs to the field of inorganic functional materials.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and relates to the preparation of a catalyst capable of efficiently photocatalyzing and degrading organic pollutants under visible light. More specifically, it is mesoporous molecular sieve (MMS) loaded persulfate-modified nano-titanium dioxide (S 2 o 8 2 - / TiO 2 ) preparation. Background technique [0002] In 1972, A.Fujishima and K.Honda worked on n-type semiconductor TiO 2 The photoelectrocatalytic decomposition of water was found on the electrodes. Taking this as an opportunity, people created a new era of heterogeneous photocatalysis research. Nowadays, using semiconductor photocatalytic materials, especially TiO 2 The heterogeneous photocatalytic process of photocatalytic degradation of organic pollutants in water has become an ideal environmental treatment technology. However, due to the photocatalysis of conventional titanium dioxide, its photogenerated electrons and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/035C02F1/30
Inventor 陈静李猛侯文华胡晨晖张荣江春涛杨惠
Owner NANJING UNIV OF TECH