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Preparation method and application of C3N4@Ag3PO4/PDA@PVDF bionic composite catalytic membrane

A C3N4, catalytic membrane technology, used in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult separation and recovery of photocatalysts, short life, etc. Excellent separation stability, the effect of solving difficult separation and recovery

Active Publication Date: 2018-07-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention couples the photocatalytic technology and the membrane catalysis technology to form a new membrane photocatalysis system, which can effectively photocatalyze the degradation of pollutants on the one hand, and on the other hand, can effectively solve the problem of separation and recovery of photocatalysts. , short lifespan, so as to realize a green and efficient "win-win" strategy in environmental water pollution control

Method used

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  • Preparation method and application of C3N4@Ag3PO4/PDA@PVDF bionic composite catalytic membrane
  • Preparation method and application of C3N4@Ag3PO4/PDA@PVDF bionic composite catalytic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1C 3 N 4 @Ag 3 PO 4 Preparation of / PDA@PVDF biomimetic composite catalytic membrane

[0032] (1) Graphite carbon nitride (g-C 3 N 4 ) preparation

[0033] g-C 3 N 4 The preparation adopts the method of thermally polymerizing melamine: weigh 20 g of melamine in a semi-closed crucible, place it in a drying oven at 80° C. for 48 hours, and then transfer the crucible to a temperature-programmed tube furnace. Heat the temperature-programmed tube furnace at a heating rate of 2.3°C / min to 550°C and keep it warm for 4 hours; after cooling down to room temperature naturally, take it out and grind it into powder with a mortar for later use;

[0034] (2) Binary compound semiconductor materials (C3N4@Ag 3 PO 4 ) preparation

[0035] Weigh 33.97mg AgNO 3 Solids and 80mg g-C 3 N 4 The powder was dissolved in 100mL deionized water, stirred magnetically for 1h to obtain mixed solution A, and 50mL 0.507g / L sodium phosphate solution (Na 3 PO 4 ) was added dropwis...

Embodiment 2

[0045] Example 2C 3 N 4 @Ag 3 PO 4 Preparation of / PDA@PVDF biomimetic composite catalytic membrane

[0046] (1) Graphite carbon nitride (g-C 3 N 4) preparation of

[0047] g-C 3 N 4 The preparation adopts the method of thermally polymerizing melamine: weigh 20 g of melamine in a semi-closed crucible, place it in a drying oven at 80° C. for 48 hours, and then transfer the crucible to a temperature-programmed tube furnace. Heat the temperature-programmed tube furnace at a heating rate of 2.3°C / min to 550°C and keep it warm for 4 hours; after cooling down to room temperature naturally, take it out and grind it into powder with a mortar for later use;

[0048] (2) Binary compound semiconductor materials (C 3 N 4 @Ag 3 PO 4 ) preparation

[0049] Weigh 16.985mg AgNO 3 Solids and 80mg g-C 3 N 4 The powder was dissolved in 100mL deionized water, stirred magnetically for 1h to obtain mixed solution A, and 50mL 0.2535g / L sodium phosphate solution (Na 3 PO 4 ) was add...

Embodiment 3

[0059] Example 3C 3 N 4 @Ag 3 PO 4 Preparation of / PDA@PVDF biomimetic composite catalytic membrane

[0060] (1) Graphite carbon nitride (g-C 3 N 4 ) preparation

[0061] g-C 3 N 4 The preparation adopts the method of thermally polymerizing melamine: weigh 20 g of melamine in a semi-closed crucible, place it in a drying oven at 80° C. for 48 hours, and then transfer the crucible to a temperature-programmed tube furnace. Heat the temperature-programmed tube furnace at a heating rate of 2.3°C / min to 550°C and keep it warm for 4 hours; after cooling down to room temperature naturally, take it out and grind it into powder with a mortar for later use;

[0062] (2) Binary compound semiconductor materials (C 3 N 4 @Ag 3 PO 4 ) preparation

[0063] Weigh 67.94mg AgNO 3 Solids and 80mg g-C 3 N 4 The powder was dissolved in 100mL deionized water, stirred magnetically for 1h to obtain mixed solution A, and 50mL 1.014g / L sodium phosphate solution (Na 3 PO 4 ) was added d...

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Abstract

The invention belongs to the technical field of environment functional materials and relates to a preparation method and application of a C3N4 composite catalytic membrane. The preparation method comprises the following steps: firstly, dissolving AgNO3 and g-C3N4 into water to obtain a solution A; dropwise adding a Na3PO4 solution into the solution A, stirring, washing, centrifugally separating and drying to obtain a binary composite semiconductor material C3N4@Ag3PO4; secondly, dissolving dopamine into a Tris-HCl solution, putting a PVDF membrane into the solution, modifying the dopamine, depositing a polydopamine layer on the surface of the PVDF membrane, and carrying out room temperature drying on the obtained polydopamine modification membrane (PDA@PVDF); dissolving the C3N4@Ag3PO4 into the water, and carrying out ultrasonic dispersion to obtain C3N4@Ag3PO4 suspension; taking PDA@PVDF as a base membrane, and carrying out vacuum filtration and room temperature drying. A silver phosphate nanomaterial is loaded with a graphite nitrogen carbide nano-sheet to form point-surface contact, so that compounding of C3N4 photo-induced electron hole pairs is inhibited, the stability of Ag3PO4 is improved and further the photocatalytic activity is improved; the C3N4@Ag3PO4 is loaded on the PVDF membrane, so that the problems that catalyst powder is difficult to recover and easy to waste,and membrane holes are blocked because of membrane pollution are solved; the removal rate of pollutants is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, in particular to a C 3 N 4 The preparation method and application of the composite catalytic membrane have simple process and good photocatalytic activity. Background technique [0002] Environmental pollution and energy shortage are two major problems that need to be solved urgently in the world today. As a green technology, photocatalysis provides a potentially effective way to completely eliminate toxic chemicals. It has the dual role of utilizing natural solar energy for environmental pollution control. The development of new photocatalysts with visible light activity has become an important research topic. [0003] Graphite-like carbon nitride (g-C 3 N 4 ) is the most stable allotrope in carbon nitride. It has the characteristics of layered structure, non-toxicity, wide source of raw materials, low cost, and thermal stability. It is gradually bei...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J31/06B01J31/26B01J35/00C02F1/30
CPCC02F1/30B01J27/24B01J31/06B01J31/26C02F2305/10B01J35/39
Inventor 崔颜华孟敏佳李彬榕冯永海戴晓晖刘燕李春香
Owner JIANGSU UNIV
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