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Silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst and preparation method and application thereof

A nanoparticle, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, other chemical processes, etc., can solve the problem of difficult to effectively match energy band positions, low photo-generated carrier separation efficiency, low specific surface area, etc. problems, to achieve the effect of improving photocatalytic activity, inhibiting recombination, and increasing specific surface area

Active Publication Date: 2018-09-14
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist in the process of constructing bismuth tungstate-based heterojunctions: low specific surface area, difficulty in effectively matching energy band positions, low separation efficiency of photogenerated carriers, poor stability, etc.

Method used

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  • Silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst and preparation method and application thereof
  • Silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst and preparation method and application thereof
  • Silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst, the silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst uses three-dimensional microspherical bismuth tungstate as a carrier, and the three-dimensional microspherical bismuth tungstate is decorated with silver iodide nanoparticles .

[0047] In this embodiment, the mass ratio of silver iodide nanoparticles to three-dimensional microspherical bismuth tungstate is 0.05:1.

[0048] In this example, the silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst has a diameter of 3 μm to 6 μm; the three-dimensional microspherical bismuth tungstate is assembled from two-dimensional bismuth tungstate nanosheets; the silver iodide nanoparticle has a diameter of 10 nm to 6 μm. 20nm.

[0049] A method for preparing the silver iodide nanoparticles modified bismuth tungstate heterojunction photocatalyst of the above-mentioned present embodime...

Embodiment 2

[0057] A silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst, which is basically the same as the silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst in Example 1, the only difference being: silver iodide nanoparticles and tungstic acid in Example 2 The mass ratio of bismuth is 0.1:1.

[0058] A method for preparing the silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst described above in this embodiment is basically the same as the preparation method in Example 1, the only difference being that the amount of silver nitrate used in the preparation method in Example 2 is 0.051 g, the concentration of potassium iodide solution is 1.97g / L.

[0059] The silver iodide nanoparticle modified bismuth tungstate heterojunction photocatalyst obtained in Example 2 is named after AgI(10wt%) / Bi 2 WO 6 .

Embodiment 3

[0061] A silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst, which is basically the same as the silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst in Example 1, the only difference being: silver iodide nanoparticles and tungstic acid in Example 3 The mass ratio of bismuth is 0.2:1.

[0062] A method for preparing the silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst of the above-mentioned present embodiment is basically the same as the preparation method of Example 1, the only difference being that the amount of silver nitrate in the preparation method of Example 3 is 0.101 g, the concentration of potassium iodide solution is 3.95g / L.

[0063] The silver iodide nanoparticle modified bismuth tungstate heterojunction photocatalyst obtained in Example 3 is named after AgI(20wt%) / Bi 2 WO 6 .

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Abstract

The invention discloses a silver iodide nanoparticle-modified bismuth tungstate heterojunction photocatalyst and a preparation method and application thereof. The photocatalyst uses three-dimensionalmicro-spherical bismuth tungstate as a carrier; the carrier is modified with silver iodide nanoparticles; the mass ratio of the carrier to the silver iodide nanoparticles is (0.05-0.4):1. The preparation method includes: preparing three-dimensional micro-spherical bismuth tungstate mixed solution, mixing the solution with an Ag+-containing substance, allowing dark reaction to proceed for 30-60 min, adding iodides, continuing to carry out black reaction for 1-1.5 h, centrifuging, washing, and drying to obtain the photocatalyst. The photocatalyst has the advantages of environmental friendliness,large specific surface area, good catalytic oxidative activity, high separation efficiency of photo-generated carrier, good reusability and the like; the preparation method has the advantages of goodsimplicity, controllable reaction conditions and the like. The photocatalyst is widely applicable to the degradation of organic wastewater, can effectively degrade organic matters in the wastewater,and has a good practical application prospect.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a bismuth tungstate heterojunction photocatalyst modified by silver iodide nanoparticles and a preparation method and application thereof. Background technique [0002] With the rapid development of modern industry, energy crisis and environmental pollution are becoming more and more serious. As a green, environmentally friendly and renewable energy source, solar energy has attracted much attention. Semiconductor photocatalysis technology has become one of the most effective technologies for exploiting solar energy. Among them, titanium dioxide is the most studied and widely used semiconductor photocatalytic material, but because of its wide band gap, it can only absorb ultraviolet light, which only accounts for 4% of solar energy. Therefore, in order to utilize solar energy to a greater extent, it is particularly important to develop new photocatalytic materials with visible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J20/02B01J20/30C02F1/30C02F1/28C02F101/30
CPCB01J20/0218B01J20/0233B01J20/0259B01J20/0288C02F1/281C02F1/30B01J27/08C02F2305/10C02F2101/308B01J35/39
Inventor 薛文静黄丹莲曾光明万佳邓锐李婧龚小敏王荣忠杨洋李必胜
Owner HUNAN UNIV
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