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Preparation method of visible-light-induced photocatalyst with core-shell structure

A core-shell structure and catalyst technology, applied in the field of photocatalysis, can solve the problems of limited catalytic efficiency, complicated preparation process of visible light catalyst, etc., and achieve the effect of energy saving of the preparation method

Inactive Publication Date: 2017-05-24
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a visible light catalyst with a core-shell structure. The method for preparing a visible light catalyst with a core-shell structure needs to solve the preparation process of the visible light catalyst in the prior art. Complex, technical issues with limited catalytic effectiveness

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  • Preparation method of visible-light-induced photocatalyst with core-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Bi 2 S 3Preparation of nanowires

[0025] a. Weigh bismuth nitrate, thiourea, lithium hydroxide, polyvinylpyrrolidone (PVP), and ethylene glycol in proportions of 1 mmol: 3 mmol: 3 g: 1 mmol: 10 ml;

[0026] b. put the material weighed in step a into the reactor, and react at 200 ° C for 24 h;

[0027] c. Filter the mixture obtained in b, wash, and vacuum-dry at 80 °C for 6 h to obtain Bi 2 S 3 Nanowires.

[0028] (2) ZIF-8@Bi 2 S 3 Self-assembly of nanowires:

[0029] a. Weigh 17.5mmolZn(NO 3 ) 2 •6H 2 O was dispersed in 15 ml of methanol solution, ultrasonicated for 10 min, and left to stand to form a stable aqueous alcohol solution;

[0030] b. Weigh 0.35mmol Bi from (1) 2 S 3 Nanowires, soaked in a solution, stirred for 5h, then filtered and washed to promote Bi 2 S 3 Nanowires assemble to form Zn through S-Zn coupling bond energy 2+ @Bi 2 S 3 Composite structure;

[0031] c. Weigh 35mmol 2-methylimidazole and disperse in 15ml methanol solutio...

Embodiment 2

[0035] (1) Bi 2 S 3 Preparation of nanowires

[0036] a. Weigh bismuth nitrate, thiourea, lithium hydroxide, polyvinylpyrrolidone (PVP), and ethylene glycol in proportions of 1 mmol: 3 mmol: 3 g: 1 mmol: 10 ml;

[0037] b. put the material weighed in step a into the reactor, and react at 200 ° C for 24 h;

[0038] c. Filter the mixture obtained in b, wash, and vacuum-dry at 80 °C for 6 h to obtain Bi 2 S 3 Nanowires.

[0039] (2) ZIF-8@Bi 2 S 3 Self-assembly of nanowires:

[0040] a. Weigh 7mmolZn(NO 3 ) 2 •6H 2 O was dispersed in 15 ml of methanol solution, ultrasonicated for 10 min, and left to stand to form a stable aqueous alcohol solution;

[0041] b. Weigh 0.35mmol Bi from (1) 2 S 3 Nanowires, soaked in a solution, stirred for 5h, then filtered and washed to promote Bi 2 S 3 Nanowires assemble to form Zn through S-Zn coupling bond energy 2+ @Bi 2 S 3 Composite structure;

[0042] c. Weigh 14 mmol 2-methylimidazole and disperse it in 15 ml of methanol s...

Embodiment 3

[0046] (1) Bi 2 S 3 Preparation of nanowires

[0047] a. Weigh bismuth nitrate, thiourea, lithium hydroxide, polyvinylpyrrolidone (PVP), and ethylene glycol in proportions of 1 mmol: 3 mmol: 3 g: 1 mmol: 10 ml;

[0048] b. put the material weighed in step a into the reactor, and react at 200 ° C for 24 h;

[0049] c. Filter the mixture obtained in b, wash, and vacuum-dry at 80 °C for 6 h to obtain Bi 2 S 3 Nanowires.

[0050] (2) ZIF-8@Bi 2 S 3 Self-assembly of nanowires:

[0051] a. Weigh 5mmolZn(NO 3 ) 2 •6H 2 O was dispersed in 15 ml of methanol solution, ultrasonicated for 10 min, and left to stand to form a stable aqueous alcohol solution;

[0052] b. Weigh 0.35mmol Bi from (1) 2 S 3 Nanowires, soaked in a solution, stirred for 5h, then filtered and washed to promote Bi 2 S 3 Nanowires assemble to form Zn through S-Zn coupling bond energy 2+ @Bi 2 S 3 Composite structure;

[0053] c. Weigh 10mmol 2-methylimidazole and disperse in 15ml methanol solution,...

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Abstract

The invention discloses a preparation method of a visible-light-induced photocatalyst with a core-shell structure. Firstly, a solvothermal method is adopted to prepare a Bi2S3 nanowire serving as a core; then, the Bi2S3 nanowire is used as a base material, a gradual assembly method is utilized to perform in-situ growth, and porous ZIF-8 serving as a shell is obtained, namely the visible-light-induced photocatalyst with the Bi2S3 nanowire serving as the core and the porous ZIF-8 as the shell is obtained. The preparation conditions are mild, the process is simple, the maneuverability is good, the obtained material has the advantages of high stability and catalytic efficiency and has the obvious visible light degradation effect on dye wastewater, the visible-light-induced photocatalyst is used for degrading Rhodamine B under visual light, the highest catalysis rate can be up to 97% in 90 minutes, and the photocatalyst is hopeful to be applied in other aspects, for example, gas absorption, photoelectric materials or photocatalytic materials.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a catalyst, in particular to a preparation method of a core-shell structure visible light catalyst. Background technique [0002] With the global environmental pollution and energy crisis becoming more and more serious, environmental protection and sustainable development have become important issues of human concern. In recent years, due to the massive discharge of industrial and agricultural wastewater and domestic sewage, the content of organic matter in the water body has increased, the water pollution has been serious, and it has gradually threatened the survival of human beings. At present, photocatalytic technology is considered to be the most effective and promising method to solve energy and environmental problems. However, the limitations in the performance of a single semiconductor material have gradually been unable to meet the needs of practical functional applications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J35/04
CPCB01J31/26B01J2531/26B01J2531/0233B01J35/39B01J35/56
Inventor 房永征丁艳花张娜刘玉峰张小磊张恒曹珍
Owner SHANGHAI INST OF TECH
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