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A kind of graphene-γ-bismuth molybdate nanocomposite material and its preparation method and application

A nanocomposite material and graphene technology are applied in the field of graphene-γ-bismuth molybdate nanocomposite materials and their preparation, which can solve problems such as limiting the large-scale application of bismuth-based photocatalysts, and achieve excellent electron mobility and energy consumption. Low, enhanced photocatalytic activity

Active Publication Date: 2019-05-03
武汉市恒星防水材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its main disadvantage is that the photogenerated electrons and holes in bismuth-based semiconductor photocatalysts are easy to recombine, which greatly limits the large-scale application of bismuth-based photocatalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of graphene-γ-bismuth molybdate nanocomposite material comprises the following steps:

[0021] 1) Dissolve 100g of bismuth nitrate in 1L of ethylene glycol, then add 0.5g of graphene powder and mix evenly to obtain a stable suspension. Transfer this solution to an autoclave with a volume of 2L, heat to 160°C and keep it warm 24 hours; after the reactor is cooled to room temperature, filter and wash with ethanol for 3 times, and then dry at 80°C for 12 hours to obtain graphene-bismuth ethylene glycol powder;

[0022] 2) Take 25g of sodium molybdate and dissolve it in 250ml of deionized water, then add 50g of the graphene-ethylene glycol powder prepared in 1) into the above-mentioned sodium molybdate aqueous solution, stir with ultrasonic vibration to make it evenly dispersed, and use concentrated nitric acid and concentrated hydrochloric acid Adjust the pH value of the solution to between 0-3, then transfer the resulting mixture to an autoclave wit...

Embodiment 2

[0025] The preparation method of graphene-γ-bismuth molybdate nanocomposite material comprises the following steps:

[0026] 1) Dissolve 50g of bismuth nitrate in 1L of ethylene glycol, then add 2.5g of graphene powder and mix evenly to obtain a stable suspension. Transfer this solution to an autoclave with a volume of 2L, heat to 180°C and keep it warm 2 hours; the reactor was cooled to room temperature, filtered and washed with ethanol for 3 times, and then dried at 80°C for 6 hours to obtain graphene-ethylene glycol bismuth powder;

[0027] 2) Take 4g of sodium molybdate and dissolve it in 200ml of deionized water, then add 10g of the graphene-ethylene glycol bismuth powder prepared in 1) into the above sodium molybdate aqueous solution, stir with ultrasonic vibration to disperse evenly, and use concentrated nitric acid and concentrated Adjust the pH value of the solution to 0-3 with hydrochloric acid, then transfer the resulting mixture to an autoclave with a volume of 500...

Embodiment 3

[0030] The preparation method of graphene-γ-bismuth molybdate nanocomposite material comprises the following steps:

[0031] 1) Dissolve 50g of bismuth nitrate in 1L of ethylene glycol, then add 2g of graphene powder and mix evenly to obtain a stable suspension. Transfer this solution to an autoclave with a volume of 2L, heat to 170°C and keep it warm for 12 Hours; the reactor was cooled to room temperature, filtered and washed 3 times with ethanol, then dried at 100°C for 4 hours to obtain graphene-ethylene glycol bismuth powder;

[0032] 2) Take 3.5g of sodium molybdate and dissolve it in 100ml of deionized water, then add 10g of the graphene-ethylene glycol bismuth powder prepared in 1) into the above aqueous solution of sodium molybdate, stir with ultrasonic vibration to disperse evenly, and use concentrated nitric acid and Concentrated hydrochloric acid to adjust the pH value of the solution to between 0-3, then transfer the resulting mixed solution to an autoclave with a...

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Abstract

The invention discloses a method for preparing a graphene-gamma-bismuth molybdate nano-composite material. The method includes steps of 1), carrying out solvent thermal reaction on graphene, bismuth nitrate and ethylene glycol to obtain reaction products and filtering, washing and drying the reaction products to obtain graphene-ethylene glycol bismuth compounds; 2), uniformly dispersing the compounds in sodium molybdate aqueous solution to obtain a solution system, regulating a pH (potential of hydrogen) value of the obtained solution system until the pH value is 0-3, then carrying out hydrothermal reaction on the solution system to obtain reaction products and filtering, washing and drying the reaction products to obtain the graphene-gamma-bismuth molybdate nano-composite material. The method has the advantages that the graphene-gamma-bismuth molybdate nano-composite material is mainly prepared from graphene, bismuth nitrate, sodium molybdate and ethylene glycol by the aid of solvent thermal processes and hydrothermal processes which are combined with one another; technologies and equipment for preparing the graphene-gamma-bismuth molybdate nano-composite material are simple, reaction conditions are mild, the method is low in energy consumption, the technologies are novel, and the graphene-gamma-bismuth molybdate nano-composite material prepared by the aid of the method has large specific surface area and is excellent in visible light photocatalytic performance.

Description

technical field [0001] The invention belongs to the field of new environmental protection materials, and in particular relates to a graphene-γ-bismuth molybdate nanocomposite material and its preparation method and application. Background technique [0002] The seriousness of environmental pollution has become a focal issue that directly threatens human existence and needs to be resolved urgently. As a branch of green chemistry, photocatalytic technology can oxidize and decompose organic pollutants in the environment, and finally degrade them into CO 2 , water and inorganic ions and other small molecules, no secondary pollution, high degree of degradation, is considered to be the most promising pollution treatment method. But traditional TiO 2 Photocatalyst, with wide band gap, mainly absorbs ultraviolet light, can only use ultraviolet light in sunlight, and has a low utilization rate of sunlight. The development of new nanomaterials that can utilize visible light photoca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C02F1/30
CPCB01J21/18B01J23/31B01J35/004B01J35/1014C02F1/30C02F2103/30C02F2305/10
Inventor 郭雅妮鲍世轩
Owner 武汉市恒星防水材料有限公司
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