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Bismuth vanadate/chromium porphyrin/graphene quantum dot two-dimensional composite Z-type photocatalytic material, preparation method and application

A technology of graphene quantum dots and photocatalytic materials, applied in the directions of organic compound/hydride/coordination complex catalysts, catalyst activation/preparation, chemical instruments and methods, etc., to achieve mild preparation conditions, great application value and prospects, simple craftsmanship

Active Publication Date: 2019-07-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no information about BiVO 4 / GOD / CrPyCl two-dimensional composite Z-type photocatalytic material and its preparation method, and the report of its visible light-driven full splitting water hydrogen production performance

Method used

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  • Bismuth vanadate/chromium porphyrin/graphene quantum dot two-dimensional composite Z-type photocatalytic material, preparation method and application
  • Bismuth vanadate/chromium porphyrin/graphene quantum dot two-dimensional composite Z-type photocatalytic material, preparation method and application
  • Bismuth vanadate/chromium porphyrin/graphene quantum dot two-dimensional composite Z-type photocatalytic material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 0.5mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 35 mL HNO 3 (4M) formulated into Bi(NO 3 ) 3 solution, 0.5 mmol NH 4 VO 3 Dissolved in NaOH (2M) to make NH 4 VO 3 solution, 120mg of graphene quantum dots (GOD) was added to the above Bi(NO 3 ) 3 solution, after stirring for 30 min, add NH 4 VO 3 solution, adjust the solution to pH = 7.0, hydrothermally treat at 180°C for 3h, and wash the hydrothermal product with deionized water and ethanol to obtain BiVO 4 / GOD product. 0.1g BiVO 4 / GOD was added to 10mL (0.05mM) chromium porphyrin DMF solution, after stirring for 72h, the product was collected by rotary evaporation to obtain 5μmol g -1 Chromium porphyrin loaded BiVO4 / GOD / CrPyCl. To containing 4.0mg Pt (NH 3 ) 4 (NO 3 ) 2 0.2g BiVO4 / GOD / CrPyCl was added to the aqueous solution (40mL), stirred for 1h, the product was collected by rotary evaporation, and treated overnight at 120°C in air to obtain PtO with 1.0wt% platinum loading x -BiVO 4 / GOD / CrPyCl.

[0...

Embodiment 2

[0038] 0.5mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 35 mL HNO 3 (4M) formulated into Bi(NO 3 ) 3 solution, 0.5 mmol NH 4 VO 3 Dissolved in NaOH (2M) to make NH 4 VO 3 solution, 120mg of graphene quantum dots (GOD) was added to the above Bi(NO 3 ) 3 solution, after stirring for 30 min, add NH 4 VO 3 solution, adjust the solution to pH 7.0, hydrothermally treat at 180°C for 3h, and wash the hydrothermal product with deionized water and ethanol to obtain BiVO 4 / GOD product. 0.1g BiVO 4 / GOD was added to 10mL (0.1mM) chromium porphyrin DMF solution, stirred for 72h, and the product was collected by rotary evaporation to obtain 10μmol g -1 Chromium porphyrin loaded BiVO4 / GOD / CrPyCl. To containing 4.0mg Pt (NH 3 ) 4 (NO 3 ) 2 Add 0.2g BiVO4 / GOD / CrPyCl to an aqueous solution (40mL), stir for 1h, collect the product by rotary evaporation, and treat it overnight at 120°C in air to obtain PtO with 1.0wt% platinum loading x -BiVO4 / GOD / CrPyCl.

[0039] figure 2 b is Bi...

Embodiment 3

[0041] 0.5mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 35 mL HNO 3 (4M) formulated into Bi(NO 3 ) 3 solution, 0.5 mmol NH 4 VO 3 Dissolved in NaOH (2M) to make NH 4 VO 3 solution, 120mg of graphene quantum dots (GOD) was added to the above Bi(NO 3 ) 3 solution, after stirring for 30min, after adding NH 4 VO 3 solution, adjust the solution to pH 7.0, hydrothermally treat at 180°C for 3h, and wash the hydrothermal product with deionized water and ethanol to obtain BiVO 4 / GOD product. 0.1g BiVO 4 / GOD was added to 10mL (0.15mM) chromium porphyrin DMF solution, after stirring for 72h, the product was collected by rotary evaporation to obtain 15μmol g -1 Chromium porphyrin loaded BiVO4 / GOD / CrPyCl. To containing 4.0mg Pt (NH 3 ) 4 (NO 3 ) 2 0.2g BiVO4 / GOD / CrPyCl was added to the aqueous solution (40mL), stirred for 1h, the product was collected by rotary evaporation, and treated overnight at 120°C in air to obtain PtO with 1.0wt% platinum loading x - BiVO4 / GOD / CrPyCl p...

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Abstract

The invention provides a bismuth vanadate / chromium porphyrin / graphene quantum dot two-dimensional composite Z-type photocatalytic material, a preparation method and application. The photocatalytic material uses a functionalized graphene quantum dot (GOD) as a template to composite a bismuth vanadate (BiVO4) nanosheet, then a chromium porphyrin complex (CrPyCl) with a two-dimensional plane structure is combined with the BiVO4 nanosheet, the CrPyCl is uniformly and closely distributed on the surface of the BiVO4 nanosheet, and the GOD is used as an electron transmitter to construct the two-dimensional composite material with a Z-type photocatalytic mechanism. The CrPyCl in the photocatalytic material can be uniformly and closely dispersed on the surface of the BiVO4 nanosheet, so that the rapid transmission of electrons in a photocatalytic process is facilitated, thereby improving the light utilization efficiency and photocatalytic performance of a system; while the redox capability of photon-generated charge is maintained, the separation efficiency of photon-generated carriers is improved; the photocatalytic material has good hydrogen production performance of visible light-driven photocatalytic full-splitting water, and has good application prospect in the catalytic hydrogen production of Z-type mechanism full-splitting water.

Description

technical field [0001] The invention relates to the technical field of preparation of nanometer photocatalytic materials and their application in hydrogen production, in particular to two-dimensional composite Z-type photocatalytic materials of bismuth vanadate / chromium porphyrin / graphene quantum dots, a preparation method and applications thereof. Background technique [0002] Energy is the material basis for the survival and development of human beings, and it is also an important strategic resource for national economic development. At present, the massive development and utilization of fossil energy such as oil, coal and natural gas has led to the serious deterioration of the human ecological environment, while hydrogen energy is a new type of energy with abundant reserves and no pollution. As an energy carrier, hydrogen has high energy density, can be stored and transported, and the only product after combustion is water, which does not pollute the environment. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/36B01J37/03B01J37/08B01J37/10C01B3/04
CPCB01J31/36B01J37/0018B01J37/10B01J37/031C01B3/042C01B2203/1041C01B2203/0277B01J35/39Y02E60/36
Inventor 彭天右汪进明
Owner WUHAN UNIV
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