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Graphene/bismuth oxyiodide/graphene sandwich structure photocatalyst, and preparation method and application thereof

A bismuth oxyiodide and photocatalyst technology, which is applied in the field of photocatalysis, can solve the problems of increased photocatalytic activity, limited contact area, and difficulty in recycling, and achieve the effects of increased photoresponse range, photocatalytic performance, and catalytic efficiency

Inactive Publication Date: 2019-09-27
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bismuth oxyiodide prepared by this method has only one side in contact with graphene, and the contact area is limited, which cannot effectively transport photogenerated electrons, and the improvement of photocatalytic activity is limited.
Moreover, BiOI-graphene powder is not easy to recycle during actual use
Most of the current bismuth oxyhalide / graphene composite systems have a two-layer structure in which bismuth oxyhalide is supported on the surface of graphene, the contact between bismuth oxyhalide and graphene is insufficient, the improvement of electron transport capacity is limited, and the photocatalytic activity is not greatly improved; and Most bismuth oxyhalide / graphene composite systems synthesized by traditional methods are powders, which are not easy to recycle
In summary, the existing technology still lacks a bismuth oxyiodide / graphene composite photocatalyst that can effectively transport photogenerated electrons, has high catalytic performance, is simple to prepare, and is convenient to recycle.

Method used

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  • Graphene/bismuth oxyiodide/graphene sandwich structure photocatalyst, and preparation method and application thereof
  • Graphene/bismuth oxyiodide/graphene sandwich structure photocatalyst, and preparation method and application thereof
  • Graphene/bismuth oxyiodide/graphene sandwich structure photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of graphene / bismuth oxyiodide / graphene composite photocatalyst A1

[0040] (1) Dilute the graphene oxide aqueous solution with ethanol solution, the concentration of graphene oxide after preparation is 0.1 mg / mL, then add 25 μL of Nafion solution, form a homogeneous solution by ultrasound, take 1 mL of the homogeneous solution with a pipette and drop-coat it on On the conductive glass, after drying at 25°C for 1 hour, put it in a tube furnace and feed it with argon for calcination. The tube furnace is heated up to 500°C at 2.5°C / min, and calcined at 500°C for 1 hour to obtain a layer of graphite vinyl conductive glass;

[0041] (2) Bismuth iodide is added in the ethanol solution, hydroiodic acid is added dropwise in the ultrasonic process until the bismuth iodide is completely dissolved to obtain a bismuth iodide solution, then 1mL bismuth iodide solution is drip-coated on the (1 ) on a conductive glass loaded with a layer of graphene, then dried at 20-30°C...

Embodiment 2

[0044] Preparation of graphene / bismuth oxyiodide / graphene composite photocatalyst A2

[0045] The rest of the method for preparing graphene / bismuth oxyiodide / graphene in this example is the same as in Example 1, except that the graphene oxide solution in (3) is configured as 0.01 mg / mL.

Embodiment 3

[0047] Preparation of graphene / bismuth oxyiodide / graphene composite photocatalyst A3

[0048] The rest of the method for preparing graphene / bismuth oxyiodide / graphene in this example is the same as in Example 1, except that the graphene oxide solution in (3) is configured as 0.05 mg / mL.

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Abstract

The invention discloses a graphene / bismuth oxyiodide / graphene sandwich structure photocatalyst, and a preparation method and application thereof. The method combines a dispensing method and a dipping method to establish a new method for graphene / bismuth oxyiodide / graphene composite film and has the advantages of simple preparation method, low price and convenient recycling. According to the catalyst prepared by the method of the invention, the upper and lower surfaces of the bismuth oxyiodide are uniformly combined with the graphene, the photoresponse range is increased, and the catalytic efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a graphene / bismuth oxyiodide / graphene sandwich structure photocatalyst, as well as its preparation method and application. Background technique [0002] Photocatalytic technology can oxidize and decompose organic pollutants in the environment, and finally degrade them into small molecular substances such as carbon dioxide, water and inorganic salts. The degree of degradation is high, and it has the advantages of high efficiency, cleanliness and no secondary pollution. Promising pollution treatment technology. Bismuth iodide oxide is a new type of semiconductor material with a layered structure. It is non-toxic and cheap, has stable chemical properties and good ultraviolet-visible light absorption performance, but its internal photogenerated carriers are easy to recombine and have a short life, which seriously affects the oxidation of iodine. Photocatalytic activity of b...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J37/02C02F1/30C02F101/30
CPCB01J27/06B01J37/02C02F1/30C02F2101/308C02F2305/10B01J35/39
Inventor 张渊明黄洁红朱毅陈维真余翔扶雄辉
Owner JINAN UNIVERSITY