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Porous membrane matrix-based monodisperse porphyrin visible-light-driven photocatalyst and preparation method thereof

A porous membrane, monodisperse technology, used in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., and can solve problems such as short wavelengths

Inactive Publication Date: 2018-04-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the photocatalyst currently used is mainly TiO 2 , but TiO 2 The forbidden bandwidth (3.2eV), photogenerated electrons can only be generated under the irradiation of short-wavelength and high-frequency ultraviolet light, and the generated photogenerated electrons are easy to recombine with their holes

Method used

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  • Porous membrane matrix-based monodisperse porphyrin visible-light-driven photocatalyst and preparation method thereof
  • Porous membrane matrix-based monodisperse porphyrin visible-light-driven photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Take a quaternized polysulfone membrane with a mass of 0.5 g, soak it in a meso-tetrakis(4-sulfophenyl)porphyrin aqueous solution with a pH value of 6.0 and a concentration of 120 μmol / L for 6 hours, take it out and wash it with distilled water. A monodisperse porphyrin functionalized porous membrane was obtained, which showed the UV diffuse reflectance spectrum as attached figure 1 shown;

[0012] Soak the porphyrin functionalized porous membrane in 200mL of rhodamine B dye aqueous solution with a concentration of 10mg / L and a pH value of 6.5, place the catalyst and dye solution under a xenon lamp light source and irradiate with visible light for 5h to degrade the dye. The degradation rate of the dye The change curve with the degradation time is attached figure 2 As shown, the degradation rate of rhodamine B reached 92.1%.

Embodiment 2

[0014] Take a quaternized polyethersulfone membrane with a mass of 0.5 g, soak it in a meso-tetrakis(4-carboxyphenyl) porphyrin aqueous solution with a pH value of 8.0 and a concentration of 120 μmol / L for 6 hours, take it out and wash it with distilled water. A monodisperse porphyrin functionalized porous membrane was obtained;

[0015] Soak the porphyrin functionalized porous membrane in 200mL of an aqueous solution of methylene blue dye with a concentration of 20mg / L and a pH value of 6.5, place the catalyst and dye solution under a xenon lamp light source and irradiate it with visible light for 7h to degrade the dye, and the degradation rate of methylene blue reaches 94.5%.

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Abstract

The invention discloses a preparation method of a porous membrane matrix-based monodisperse porphyrin visible-light-driven photocatalyst. A macromolecule porous membrane is an electropositive quaternized polysulfone membrane, a quaternized polyether sulfone membrane or a quaternized polysulfone / quaternized polyether sulfone blended membrane; porphyrin is meso-tetra(4-sulfonatophenyl)porphyrin (TPPS), meso-tetra(4-carboxylphenyl)porphyrin (TCPP) a mixture thereof. A monodisperse porphyrin functional membrane is prepared by immersing an electropositive porous membrane into a porphyrin solution,and performing electrostatic assembly for 1 to 10h. The functional membrane can be used for photocatalytically degrading organic dyes. The method has the advantages that the operation is simple, the period is short, the catalyst is easy to recover and reuse, the degradation efficiency is high, environment friendliness is realized, and the like.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a monodisperse porphyrin visible light catalyst based on a porous membrane substrate and a preparation method thereof. Background technique [0002] my country is a big textile country, and chemical fiber fabrics are updated rapidly, and a large amount of dye wastewater is produced every year. The sources of dye wastewater are complex, such as every branch of the textile industry and various processing procedures in the textile production process will produce dye wastewater. When producing different kinds of textiles, there are differences in raw materials, added dyes, and medicaments, resulting in different contents and types of organic chemicals that must be contained in the wastewater of the textile industry. There are many types and large amounts. COD / BOD is high, resulting in extremely high chemical oxygen demand in water. [0003] Organic dyes have certain chromogenic groups...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J35/10C02F1/30C02F101/30C02F103/30
CPCC02F1/30B01J31/06C02F2101/308C02F2103/30C02F2305/10B01J35/60B01J35/39
Inventor 严峰王明霞赵娟刘晓航孟祥宇
Owner TIANJIN POLYTECHNIC UNIV
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