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Carbon nanodot-modified bismuth tungstate photocatalyst, and preparation method and application thereof

A technology of carbon nano-dots and photocatalysts, applied in nano-optics, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of few reaction sites, bismuth tungstate cannot reach the theoretical threshold of photoelectric conversion, etc. It achieves the effects of simple preparation process, broadening the photoresponsivity and light absorption ability of visible light, and high photogenerated electron transfer ability

Inactive Publication Date: 2019-10-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high recombination rate of photogenerated carriers of bismuth tungstate photocatalyst and the few reaction sites on the surface, bismuth tungstate is far from reaching the theoretical threshold of photoelectric conversion.

Method used

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  • Carbon nanodot-modified bismuth tungstate photocatalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Dissolve 1.5mmol of bismuth tungstate dihydrate in 10ml of deionized water, and sonicate until completely dissolved to prepare a sodium tungstate precursor.

[0033] 2. Take 1.5 mmol of bismuth nitrate pentahydrate and dissolve it in 10 ml of dilute nitric acid solution with pH=6, and sonicate until completely dissolved to prepare a bismuth nitrate precursor.

[0034] 3. Mix 10ml of sodium tungstate precursor solution with 10ml of bismuth nitrate precursor solution to obtain a milky white bismuth tungstate precursor solution, transfer it to a 50ml high-temperature reaction kettle, and conduct a hydrothermal reaction at 120°C for 2 hours. After the hydrothermal treatment, the sediment was washed 5 times with deionized water. The washed sediment was placed in a quartz dish, transferred to a muffle furnace, and sintered at 450° C. for 2 h in an air atmosphere. After sintering, grind to obtain powdered bismuth tungstate powder.

[0035] 4. The carbon nano-dot solution i...

Embodiment 2

[0040] 1. Dissolve 5mmol of bismuth tungstate dihydrate in 10ml of deionized water, and sonicate until completely dissolved to prepare a sodium tungstate precursor.

[0041] 2. Dissolve 1 mmol of bismuth nitrate pentahydrate in 10 ml of dilute nitric acid solution with pH=6, and sonicate until completely dissolved to prepare a bismuth nitrate precursor.

[0042] Mix 3.5ml sodium tungstate precursor solution with 10ml bismuth nitrate precursor solution to obtain milky white bismuth tungstate precursor solution, transfer it to a 50ml high-temperature reaction kettle, and conduct a hydrothermal reaction at 100°C for 5 hours. After the hydrothermal treatment, the sediment was washed 5 times with deionized water. The washed sediment was placed in a quartz dish, transferred to a muffle furnace, and sintered at 400° C. for 4 h in an air atmosphere. After sintering, grind to obtain powdered bismuth tungstate powder.

[0043] 4. The carbon nano-dot solution is prepared by a simple hyd...

Embodiment 3

[0046] 1. Dissolve 1.mmol of bismuth tungstate dihydrate in 10ml of deionized water, and sonicate until completely dissolved to prepare a sodium tungstate precursor.

[0047] 2. Dissolve 5 mmol of bismuth nitrate pentahydrate in 10 ml of dilute nitric acid solution with pH=5, and sonicate until completely dissolved to prepare a bismuth nitrate precursor.

[0048] 3. Mix 10ml sodium tungstate precursor solution with 5ml bismuth nitrate precursor solution to obtain a milky white bismuth tungstate precursor solution, transfer it to a 50ml high-temperature reaction kettle, and conduct a hydrothermal reaction at 250°C for 1 hour. After the hydrothermal treatment, the sediment was washed 5 times with deionized water. The washed sediment was placed in a quartz dish, transferred to a muffle furnace, and sintered at 520° C. for 1.5 h in an air atmosphere. After sintering, grind to obtain powdered bismuth tungstate powder.

[0049] 4. The carbon nano-dot solution is prepared by a simpl...

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Abstract

The invention discloses a carbon nanodot-modified bismuth tungstate photocatalyst and application thereof, belonging to the technical field of photocatalytic oxidation. A preparation method for the bismuth tungstate photocatalyst comprises the following steps: preparing a sodium tungstate precursor solution A from a sodium tungstate dihydrate and deionized water, and preparing a bismuth nitrate precursor solution B from bismuth nitrate pentahydrate and dilute nitric acid solution; mixing the precursor solution A with the precursor solution B, carrying out a hydrothermal reaction at 100-250 DEGC, washing a precipitate with deionized water after completion of the reaction, drying the precipitate, then calcining the precipitate at 400-520 DEG C, and performing grinding to obtain bismuth tungstate powder; dissolving an ethylenediamine solution and a citric acid monohydrate in deionized water to prepare a carbon nanodot precursor solution, subjecting the carbon nanodot precursor solution to a hydrothermal reaction at 100-300 DEG C, carrying out filtering to obtain a carbon nanodot solution, dropwise adding the carbon nanodot solution into the bismuth tungstate powder, and carrying outmixing, drying and grinding so as to obtain the carbon nanodot-modified bismuth tungstate photocatalyst. The carbon nanodot-modified bismuth tungstate photocatalyst has excellent ability of photocatalytic oxidation of organic pollutants, and can be used for photocatalytic oxidation of organic pollutants such as rhodamine B and phenol.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic oxidation, and more specifically relates to a bismuth tungstate photocatalyst modified by carbon nano-dots and a preparation method and application thereof. Background technique [0002] The problem of environmental pollution is one of the major social problems faced by human beings. With the widespread use of organic chemical substances in human society and the discharge of organic industrial wastewater, it is a scientific research field to find ideal photocatalysts with high performance and environmental friendliness. And the goal of endless struggle. Photocatalytic oxidation technology is a branch of the emerging photocatalytic field. Photocatalytic oxidation technology is a green technology that uses solar energy as an energy source and catalyst as a medium to degrade organic pollutants. Photocatalytic oxidation degradation of organic pollutants is more ideal than traditional physical ...

Claims

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Application Information

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IPC IPC(8): B01J23/31C09K11/65B82Y20/00B82Y40/00C02F1/30C02F101/30C02F101/34
CPCB01J23/31B01J23/002C09K11/65B82Y20/00B82Y40/00C02F1/30C02F2305/10C02F2101/308C02F2101/345B01J35/23B01J35/39
Inventor 陈其赞罗东向张梦龙李洁
Owner GUANGDONG UNIV OF TECH
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