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MOF and HrGO co-modified bismuth vanadate electrode as well as preparation method and application thereof

A technology of bismuth vanadate and co-modification, applied in the field of photoelectric catalytic electrode materials, can solve the problems of inability to directly apply electrode preparation and implementation, and achieve the effects of good photoelectric catalytic activity, high photocurrent, and improved photoelectric conversion efficiency.

Active Publication Date: 2020-06-30
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution prepares powder materials, and grows BiVO in situ on MIL-125(Ti) 4 , cannot be directly applied to electrode preparation
Because the electrode preparation must be substrate / BiVO 4 / MIL-125(Ti) structure, unable to implement in-situ growth of BiVO on MIL-125(Ti) 4 s method

Method used

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  • MOF and HrGO co-modified bismuth vanadate electrode as well as preparation method and application thereof
  • MOF and HrGO co-modified bismuth vanadate electrode as well as preparation method and application thereof
  • MOF and HrGO co-modified bismuth vanadate electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a photoelectric catalytic electrode includes the following steps:

[0041] (1) Add 0.3234g Bi(NO) 3 ·5H 2 Dissolve O in 1mL concentrated nitric acid (70wt%), then add 2mL distilled water, mix well and add 0.078g NH 4 VO 3 And 0.167g polyvinyl alcohol (PVA, 99%) were dissolved in the above solution, and the seed solution was obtained by ultrasonic for 30 minutes.

[0042] (2) Smear 20μL of seed solution on clean FTO, dry in vacuum for 1 hour, and calcinate in a muffle furnace at 450°C for 2 hours.

[0043] (3) Add 0.06mmol Bi(NO) 3 ·5H 2 O and 0.06mmol NH 4 VO 3 Dissolve in 400μL concentrated nitric acid (70wt%), add distilled water to 15mL, put it into the autoclave, put the conductive surface down, put the BiVO obtained after step (2) burned in the muffle furnace 4 The slices were hydrothermally heated at 180°C for 12h, washed with distilled water and calcined in a muffle furnace at 450°C for 2h to obtain BiVO 4 electrode.

[0044] (4) Dissolve 0.75mmol 2...

Embodiment 2

[0047] Preparation of BiVO in this example 4 / NH 2 MIL125-GO and BiVO 4 / NH 2 The method of MIL125-rGO electrode, the process is basically the same as in Example 1, the difference is:

[0048] After mixing the two solutions uniformly in step (4), add 2mg GO and 2mg rGO respectively, sonicate for 30 minutes and mix them evenly into the autoclave, and put the prepared BiVO respectively 4 The electrode is placed in it with the conductive surface facing down, and solvothermally heated at 150°C for 12 hours to obtain BiVO 4 / NH 2 MIL125-GO electrode and BiVO 4 / NH 2 MIL125-rGO electrode.

[0049] The GO and rGO used in this example were prepared by the following methods:

[0050] The modified Hummers method is used to prepare graphene oxide (GO) with natural graphite powder as raw material and chemical oxidation method; rGO is prepared by chemical synthesis method, and the prepared graphene oxide is pre-reduced with sodium borohydride at 80°C for 1 hour, then Sulfonate with aryl diazonium...

Embodiment 3

[0052] Preparation of BiVO in this example 4 / NH 2 The method of MIL125 electrode, the process is basically the same as in Example 1, the difference is:

[0053] After stirring the two solutions evenly in step (4), put them directly into the prepared BiVO 4 The electrode is placed in it with the conductive surface facing down, and solvothermally heated at 150°C for 12 hours to obtain BiVO 4 / NH 2 MIL125 electrode.

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Abstract

The invention discloses an MOF and HrGO co-modified bismuth vanadate electrode as well as a preparation method and application thereof in the field of photoelectrocatalysis, the preparation method comprises the following steps: (1) dissolving bismuth nitrate in nitric acid, then adding ammonium metavanadate and polyvinyl alcohol, and carrying out ultrasonic treatment to obtain a seed solution; smearing the seed solution on a clean conductive glass, drying, calcining, and taking out a product as a substrate electrode for later use; (2) dissolving bismuth nitrate and ammonium metavanadate in nitric acid, putting the substrate electrode prepared in the step (1) into an obtained solution, carrying out hydrothermal reaction,and after the reaction is finished, calcining to obtain a BiVO4 electrode; (3) dissolving 2-aminoterephthalic acid into DMF, dissolving butyl titanate in methanol, mixing obtained two solutions to be uniform through stirring, adding reduced graphene oxide obtained by hydrogen plasma treatment, uniformly mixing, finally adding the BiVO4 electrode, and carrying out solvothermal reaction to obtain the BiVO4 / NH2MIL125-HrGO composite membrane electrode.

Description

Technical field [0001] The invention relates to the technical field of photoelectric catalytic electrode materials, in particular to a bismuth vanadate electrode co-modified by MOF and HrGO, and a preparation method and application thereof. Background technique [0002] With the advancement of industrialization and the rapid economic development, the use of a large amount of organic matter has caused wastewater containing organic matter to be enriched in the water environment to cause water pollution. How to conduct water pollution control economically, effectively and with low energy consumption is urgent. As a kind of green energy, solar energy is rich in resources and does not produce secondary pollution, which has attracted widespread attention. Photocatalysis, driven by sunlight, can generate photo-generated electron and hole pairs under light irradiation, and is widely used in the degradation of organic pollutants. However, limited by the deficiencies such as the easy reco...

Claims

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Application Information

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IPC IPC(8): C02F1/46C02F1/30C02F101/34
CPCC02F1/46C02F1/30C02F2101/345Y02W10/37
Inventor 王齐刘颖琪翁文斌简育玲朱建旭张晨诚
Owner ZHEJIANG GONGSHANG UNIVERSITY
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