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Single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, preparation method of photocatalyst and application

A technology of carbon quantum dots and bismuth tungstate, applied in the field of single-layer bismuth tungstate nanosheet composite photocatalyst and its preparation, can solve the problems of low light energy efficiency, limited catalytic performance, high probability of surface electron-hole recombination, etc. , to achieve high degradation efficiency, good photocatalytic stability, and good photocatalytic performance stability.

Inactive Publication Date: 2017-06-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the above-mentioned catalysts, there are also some obvious defects. First, when sunlight or visible light is used as the light source, the light energy efficiency is low; performance is limited

Method used

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  • Single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, preparation method of photocatalyst and application
  • Single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, preparation method of photocatalyst and application
  • Single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, preparation method of photocatalyst and application

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Effect test

Embodiment 1

[0045] A carbon quantum dot-modified single-layer bismuth tungstate nanosheet (CQDs / m-BWO) composite photocatalyst, the composite photocatalyst includes a single-layer bismuth tungstate nanosheet and carbon quantum dots (CQDs), in which the single-layer tungstate The bismuth nanosheets are decorated with carbon quantum dots, and the mass ratio of the carbon quantum dots to the single-layer bismuth tungstate nanosheets is 0.03:1.

[0046] A method for preparing the carbon quantum dot-modified single-layer bismuth tungstate nanosheet (CQDs / m-BWO) composite photocatalyst in the present embodiment, comprising the following steps:

[0047] (1) Preparation of carbon quantum dots (CQDs):

[0048] (1.1) Dissolve glucose in deionized water to prepare a glucose solution with a concentration of 0.58M; add 335 μL of ethylenediamine to 10 mL of a glucose solution with a concentration of 0.58M to obtain a transparent precursor solution.

[0049] (1.2) Add the precursor solution in step (1....

Embodiment 2

[0073] The application of a carbon quantum dot-modified single-layer bismuth tungstate nanosheet (CQDs / m-BWO) composite photocatalyst in the treatment of tetracycline hydrochloride wastewater comprises the following steps:

[0074] (1) Weigh 10 mg of carbon quantum dot-modified single-layer bismuth tungstate nanosheets (CQDs / m-BWO) composite photocatalyst prepared in Example 1, and add it to a volume of 100 mL with an initial concentration of 10mg / L tetracycline hydrochloride wastewater to obtain the mixed solution, after adsorption for 0.5h, placed in the photocatalytic reaction device.

[0075] (2) Use a 500W xenon lamp for photocatalytic reaction with a light intensity of 1mw / cm 2 , measure the absorbance value of the reaction solution obtained at different photocatalytic reaction times t (10min, 20min, 30min, 40min, 50min, 60min) at a wavelength of 464nm, and combine the standard curve to obtain the concentration of tetracycline hydrochloride in the reaction solution obtai...

Embodiment 3

[0079] Photocatalytic stability test of carbon quantum dot-modified single-layer bismuth tungstate nanosheets (CQDs / m-BWO) composite photocatalyst:

[0080] (1) After the photocatalytic reaction in Example 2, the carbon quantum dot-modified single-layer bismuth tungstate nanosheet (CQDs / m-BWO) composite photocatalyst was collected by centrifugation, washed with water and ethanol in large quantities, and stored at 60°C The regenerated carbon quantum dots modified single-layer bismuth tungstate nanosheets (CQDs / m-BWO) composite photocatalysts were obtained by drying in an oven for 12 h.

[0081] (2) Weigh 10 mg of the regenerated carbon quantum dot-modified single-layer bismuth tungstate nanosheet (CQDs / m-BWO) composite photocatalyst prepared in step (1), and add it to a volume of 100 mL, the initial The mixed liquid was obtained from tetracycline hydrochloride wastewater with a concentration of 10 mg / L, and was placed in a photocatalytic reaction device after being adsorbed for...

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Abstract

The invention discloses a single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, a preparation method of photocatalyst and an application. The composite photocatalyst comprises single-layer bismuth tungstate nano-sheets and the carbon quantum dots, the single-layer bismuth tungstate nano-sheets are modified by the carbon quantum dots, and the weight ratio of the carbon quantum dots to the single-layer bismuth tungstate nano-sheets is 0.03-0.05:1. The carbon quantum dots, hexadecyl trimethyl ammonium bromide, bismuth nitrate solution and sodium tungstate solution are mixed and react in a hydrothermal manner to obtain the composite photocatalyst. The composite photocatalyst has the advantages of wide visible light response range, high degradation efficiency, good photocatalyst stability and reusable performance and the like. The preparation method of the photocatalyst has the advantages that the preparation method is simple and convenient to operate, low in raw material cost and less in energy consumption, large-scale preparation can be achieved and the like. The composite photocatalyst belongs to green synthetic technique and can be used for treating antibiotic wastewater.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a single-layer bismuth tungstate nanosheet composite photocatalyst modified by carbon quantum dots and a preparation method and application thereof. Background technique [0002] With the development of nanomaterial technology, semiconductor photocatalysis technology has broad development prospects in the technology of treating organic or inorganic pollutants in the environment. In particular, the development of visible light-responsive semiconductor photocatalytic materials has further promoted the application of semiconductor photocatalytic technology in the field of environmental restoration. [0003] Bi-based oxides are widely used in visible light catalytic hydrogen production and removal of environmental pollutants due to their unique layered structure, controllable microscopic morphology and good visible light response characteristics. The research on ultra-thi...

Claims

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Application Information

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IPC IPC(8): B01J23/31C02F1/30C02F103/34
CPCC02F1/30B01J23/002B01J23/31C02F2305/10C02F2103/343B01J35/39Y02W10/37
Inventor 汤琳王佳佳邓垚成曾光明刘雅妮陈慧冯程洋
Owner HUNAN UNIV
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