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Preparation method for bismuth-series compound nanometer photocatalyst

A nano-photocatalyst and compound technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. Long time and other problems, to achieve the effect of improving particle size uniformity and specific surface area, and improving photocatalytic activity

Inactive Publication Date: 2018-08-03
YANCHENG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods for preparing bismuth-based oxides include hydrothermal method, sol-gel method and microwave method. The hydrothermal method is a hydrothermal reaction under certain temperature and pressure conditions. The obtained bismuth-based compounds have relatively good catalytic performance, but in addition to the complex reaction process and long time, the catalyst has a high degree of irregularity and a large particle size span (generally including particles of nanometer to micrometer size), It also has a certain impact on the catalytic reaction of subsequent applications

Method used

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  • Preparation method for bismuth-series compound nanometer photocatalyst

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Embodiment 1

[0021] A preparation method of bismuth compound nano photocatalyst, comprising the following steps:

[0022] Step 1, dissolving sodium tungstate in water to prepare solution 1 with a tungstate concentration of 0.05mol / L;

[0023] Step 2, dissolving bismuth nitrate in dilute nitric acid with a concentration of 0.5mol / L to form a transparent solution, and then dispersing the transparent solution in water at 30°C to prepare a solution with a concentration of bismuth nitrate of 0.03mol / L two;

[0024] Step 3, stirring and mixing solution 1 and solution 2, heating to 300° C. under a pressure of 15 MPa, and keeping for 40 minutes to obtain reactant 1;

[0025] In step 4, the temperature of the reactant is lowered to 200° C., and the pressure is maintained at 10 MPa, and then passed into a closed environment of 0.05 MPa for flash evaporation to obtain a nano photocatalyst.

Embodiment 2

[0027] A preparation method of bismuth compound nano photocatalyst, comprising the following steps:

[0028] Step 1, the water-soluble sodium molybdate is dissolved in water, and it is prepared into solution one that the molybdate concentration is 0.07mol / L;

[0029] Step 2, dissolving bismuth sulfate in 0.4mol / L dilute sulfuric acid, then dispersing it in water to prepare a solution 2 with a bismuth salt concentration of 0.05mol / L;

[0030] Step 3, mixing solution 1 and solution 2, heating to 310° C. under a pressure of 16 MPa, and keeping for 35 minutes to obtain reactant 1;

[0031] In step 4, the temperature of the reactant is lowered to 206° C., and the pressure is maintained at 12 MPa, and then passed into a closed environment of 0.06 MPa for flash evaporation to obtain a nano photocatalyst.

Embodiment 3

[0033] A preparation method of bismuth compound nano photocatalyst, comprising the following steps:

[0034] Step 1, dissolving sodium tungstate in water to prepare a solution 1 with a tungstate concentration of 0.08mol / L;

[0035] Step 2, dissolving bismuth nitrate in dilute nitric acid with a concentration of 0.8mol / L to form a transparent solution, and then dispersing the transparent solution in water at 37°C to prepare a solution with a concentration of bismuth nitrate of 0.07mol / L two;

[0036] Step 3: Stir and mix solution 1 and solution 2, heat to 330° C. under a pressure of 18 MPa, and keep for 38 minutes to obtain reactant 1;

[0037] In step 4, the temperature of the reactant is lowered to 220° C., and the pressure is maintained at 13 MPa, and then passed into a closed environment of 0.07 MPa in the form of atomization for flash evaporation to obtain a nano photocatalyst.

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Abstract

The invention discloses a preparation method for a bismuth-series compound nanometer photocatalyst. The preparation method comprises the following steps: dissolving water-soluble tungstate or molybdate in water to prepare a solution 1; then dispersing a bismuth salt in water to prepare a solution 2; mixing the solution 1 with the solution 2, and carrying out a hydrothermal reaction at a certain temperature and a certain pressure to obtain a reactant 1; and finally, introducing the reactant 1 into a closed environment for flash evaporation to obtain the nanometer photocatalyst. The preparationmethod provided by the invention significantly improves the performance of the photocatalyst in virtue of a specific preparation step and creative introduction of a flash evaporation step.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a bismuth compound nano photocatalyst. Background technique [0002] Due to the rapid development of the economy, the two major social problems of environmental pollution and energy shortage have become increasingly prominent. It has been found that photocatalytic technology can alleviate these two major problems. Therefore, highly active photocatalysts have become the focus of research. In 1972, two Japanese scientists, Honda and Fujishima, successfully studied TiO 2 After the work of photocatalyst splitting water, people have also studied a lot of other semiconductor materials, and use these semiconductor materials to catalyze the degradation of dyes and organic pollutants. However TiO 2 Because of its own characteristics such as non-toxic, cheap, high photocatalytic activity, good stability, etc., it has attracted a lot of res...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/02B01J35/10B01J37/00
CPCB01J23/31B01J37/00B01J37/009B01J35/39B01J35/40B01J35/613
Inventor 张雅恒黄金城李俊烨王玲芳
Owner YANCHENG INST OF TECH
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