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Composite photocatalyst, and preparation method and application thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problem of low utilization rate of solar energy

Active Publication Date: 2017-01-11
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modified or modified titanium dioxide materials in the prior art still have the problem of low solar energy utilization

Method used

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  • Composite photocatalyst, and preparation method and application thereof
  • Composite photocatalyst, and preparation method and application thereof
  • Composite photocatalyst, and preparation method and application thereof

Examples

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preparation example Construction

[0025] The invention provides a kind of preparation method of composite photocatalyst, comprises the following steps:

[0026] (1) graphite phase carbon nitride is mixed with an aprotic organic solvent to obtain a graphite phase carbon nitride dispersion; metal phthalocyanine with a structure described in formula I, a condensing agent, an alkali agent and an aprotic organic solvent are mixed to obtain Metal phthalocyanine solution;

[0027] (2) Adding the graphite phase carbon nitride dispersion in the step (1) dropwise to the metal phthalocyanine solution, heating the obtained reaction solution to carry out condensation reaction, to obtain a composite photocatalyst precursor;

[0028] (3) composite photocatalyst precursor and TiO in described step (2) 2 Mixed with water, composited under ultrasonic conditions to obtain the composite photocatalyst.

[0029] The invention mixes graphite phase carbon nitride with aprotic organic solvent to obtain graphite phase carbon nitride ...

Embodiment 1

[0063] (1) Put 15g of urea in a semi-closed alumina crucible with a lid, raise the temperature to 550°C at a rate of 1°C / min in a tube furnace and maintain it for 4h to obtain g-C 3 N 4 ;

[0064] Tetracarboxyzinc phthalocyanine (ZnTcPc) is prepared according to the method for synthesizing tetracarboxycobalt phthalocyanine in the reference (Pan Yong. Novel metal phthalocyanine and its thermosensitive polymer synthesis and imitation enzyme catalytic performance. Zhejiang University, 2005.): Specific steps are as follows:

[0065] Mix 9g of trimellitic anhydride, 15.0g of urea, 4.3g of zinc chloride and 0.115g of ammonium molybdate, grind them, transfer them to a 500mL beaker, heat them in an oven to 130°C and keep the temperature constant until the foaming phenomenon stops Finally, the temperature was raised to 185°C, and a blue-black solid was obtained after a constant temperature reaction for 4 hours; the obtained product was crushed and added to 250 mL of 1.0 mol / L hydroch...

Embodiment 2

[0071] (1) Put 15g of urea in a semi-closed alumina crucible with a lid, raise the temperature to 550°C at a rate of 1°C / min in a tube furnace and maintain it for 4h to obtain g-C 3 N 4 ;

[0072] (2) Put g-C in step (1) 3 N 4 1.0g was mixed with 60mL N,N-dimethylformamide, sonicated at 400W for 24h to obtain g-C 3 N 4 Dispersion liquid; prepare tetracarboxyzinc phthalocyanine according to the method in Example 1, get tetracarboxyzinc phthalocyanine 50mg, (3H-1,2,3-triazolo[4,5-b]pyridine-3-oxyl ) 400mg of tris-1-pyrrolidinyl hexafluorophosphate, 1g of N,N-diisopropylethylamine and 120mL of N,N-dimethylformamide were mixed, ultrasonicated at 400W for 10h to obtain tetracarboxyzinc phthalocyanine dispersion ;

[0073] (3) Add 60mL of graphite phase carbon nitride dispersion liquid in step (2) dropwise to 120mL tetracarboxyzinc phthalocyanine solution at a rate of 100mL / h, react at 50°C for 6h, and use G6 Filter through a sand core funnel, wash twice with N,N-dimethylform...

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Abstract

The invention provides a preparation method of a composite photocatalyst. The preparation method comprises the following steps: mixing graphite-phase carbon nitride and a non-proton organic solvent to obtain a graphite-phase carbon nitride dispersion solution; mixing metal phthalocyanine disclosed as Formula I, a condensing agent, a neutralization agent and a non-proton organic solvent to obtain a metal phthalocyanine solution; dropwisely adding the graphite-phase carbon nitride dispersion solution into the metal phthalocyanine solution, and heating the obtained reaction solution to carry out condensation reaction, thereby obtaining a composite photocatalyst precursor; and mixing the composite photocatalyst precursor with TiO2 and water, and compounding under ultrasonic conditions to obtain the composite photocatalyst. In the composite photocatalyst prepared by the method provided by the invention, the graphite-phase carbon nitride and metal phthalocyanine are linked by amido bonds; the graphite-phase carbon nitride and titanium dioxide are sensitized by the metal phthalocyanine, thereby effectively widening the visible light response range of the photocatalyst and enhancing the solar energy utilization ratio; and thus, the composite photocatalyst has favorable application prospects in organic matter catalytic oxidation.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a composite photocatalyst and its preparation method and application. Background technique [0002] Photocatalytic reactions are chemical reactions that occur under the action of light. Photochemical reactions require molecules to absorb electromagnetic radiation of a specific wavelength, and are excited to generate molecular excited states, which then undergo chemical reactions to generate new substances, or become intermediate chemical products that trigger thermal reactions. The activation energy of photochemical reactions comes from the energy of photons. In the utilization of solar energy, photoelectric conversion and photochemical conversion have always been very active research fields. [0003] Photocatalytic oxidation is an efficient and energy-saving method for degrading pollutants. By utilizing sunlight, pollutants can be completely and effectively degraded. ...

Claims

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Application Information

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IPC IPC(8): B01J31/38C02F1/30C02F1/74C02F101/38C02F101/34C02F101/32C02F101/30
CPCC02F1/30C02F1/74B01J31/38C02F2101/34C02F2101/32C02F2101/308C02F2101/38C02F2305/10B01J35/39Y02W10/37
Inventor 吕汪洋徐铁凤李楠王希祎陈文兴
Owner ZHEJIANG SCI-TECH UNIV
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