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Preparation method of p-CoO/n-CdS/TiO2 composite semiconductor photocatalyst

A compound semiconductor and photocatalyst technology, applied in the field of photocatalytic materials, can solve problems such as insignificant effects, and achieve the effects of reducing photocorrosion, improving separation efficiency, and increasing specific surface area.

Inactive Publication Date: 2011-06-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for modifying CdS mainly include: ①precious metal deposition; ②recombination with wide bandgap semiconductors (such as CdS and TiO 2 composite, CdS and ZnO composite); ③ carrier loading (such as CdS loading on SiO 2 above), etc., but the effect is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of CdS solid powder:

[0034] Anhydrous ammonium sulfate: 30%

[0035] Anhydrous cadmium sulfate: 12%

[0036] Thiourea: 6%

[0037] Deionized water: 52%

[0038] Preparation of CdS solid powder: According to the above mass percentage, mix anhydrous ammonium sulfate, anhydrous cadmium sulfate, thiourea and deionized water, pre-react for 2 hours in a microwave reactor with a power setting of 100W, and then react at a frequency of 30KH Z , Under ultrasonic dispersion with a power of 1000W, react at 80°C for 8 hours, and then filter to obtain a solid powder cake. The solid powder cake is added to deionized water 15 times its mass, washed, ultrasonically dispersed, filtered and dried. After repeating this three times, the solid powder cake Then roast at 200°C for 4h under nitrogen protection, 4h at 350°C, and 8h at 450°C, and grind to obtain CdS solid powder after cooling;

[0039] Preparation of p-CoO / n-CdS:

[0040]CdS solid powder: 24%

[0041] Cobalt a...

Embodiment 2

[0053] Preparation of CdS solid powder:

[0054] Anhydrous Ammonium Chloride: 32%

[0055] Cadmium nitrate tetrahydrate: 14%

[0056] Thiourea: 7%

[0057] Deionized water: 47%

[0058] Preparation of CdS solid powder: According to the above mass percentage, mix anhydrous ammonium sulfate, anhydrous cadmium sulfate, thiourea and deionized water, pre-react for 2 hours in a microwave reactor with a power setting of 100W, and then react at a frequency of 30KH Z , Under ultrasonic dispersion with a power of 1000W, react at 80°C for 8 hours, and then filter to obtain a solid powder cake. The solid powder cake is added to deionized water 15 times its mass, washed, ultrasonically dispersed, filtered and dried. After repeating this three times, the solid powder cake Then roast at 200°C for 4h under nitrogen protection, 4h at 350°C, and 8h at 450°C, and grind to obtain CdS solid powder after cooling;

[0059] Preparation of p-CoO / n-CdS:

[0060] CdS solid powder: 19%

[0061] Anh...

Embodiment 3

[0073] Preparation of CdS solid powder:

[0074] Trimethylamine Sulfate: 10%

[0075] Anhydrous cadmium chloride: 10%

[0076] Thiourea: 12%

[0077] Deionized water: 68%

[0078] Preparation of CdS solid powder: According to the above mass percentage, mix anhydrous ammonium sulfate, anhydrous cadmium sulfate, thiourea and deionized water, pre-react for 2 hours in a microwave reactor with a power setting of 100W, and then react at a frequency of 30KH Z , Under ultrasonic dispersion with a power of 1000W, react at 80°C for 8 hours, and then filter to obtain a solid powder cake. The solid powder cake is added to deionized water 15 times its mass, washed, ultrasonically dispersed, filtered and dried. After repeating this three times, the solid powder cake Then roast at 200°C for 4h under nitrogen protection, 4h at 350°C, and 8h at 450°C, and grind to obtain CdS solid powder after cooling;

[0079] Preparation of p-CoO / n-CdS:

[0080] CdS solid powder: 15%

[0081] Anhydrous...

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Abstract

The invention discloses a preparation method of a p-CoO / n-CdS / TiO2 composite semiconductor photocatalyst, which comprises the steps of: firstly, with ammonium salts, cadmium salts, thiourea and deionized water as raw materials, sequentially carrying out microwave reaction, ultrasonic dispersion, heating reaction ,washing, ultrasonic dispersion, filtering, drying, roasting, grinding and other treatments to obtain solid CdS powder; secondly, with the solid CdS powder, cobalt salts, ammomia water and deionized water as raw materials, sequentially carrying out reaction, ultrasonic dispersion, reduced pressure distillation, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and other treatments to obtain solid p-CoO / n-CdS powder; and thirdly, with the solid p-CoO / n-CdS powder, tetrabutyl titanate, absolute alcohol, hydrochloric acid and deionized water as raw materials, sequentially carrying out reaction, ultrasonic dispersion, reduced pressure distillation, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and other treatments to obtain the p-CoO / n-CdS / TiO2 composite semiconductor photocatalyst; thus, the photo-corrosion speed of the CdS is effectively decreased, and the photocatalysis efficiency of the p-CoO / n-CdS / TiO2 is increased. The preparation method has simple and convenient processes, is practical and feasible, and is beneficial to popularization.

Description

technical field [0001] The present invention relates to a kind of p-CoO / n-CdS / TiO 2 The invention discloses a method for preparing a composite semiconductor photocatalyst, belonging to the field of photocatalytic materials. Background technique [0002] With the deepening of the energy crisis and environmental crisis, the development and utilization of renewable energy has become a hot spot of global concern. Solar energy is the most abundant energy available to human beings. It is an inexhaustible, inexhaustible, pollution-free, cheap energy that can be used freely and peacefully by all countries in the world. It is also a variety of renewable energy such as biomass energy, wind energy, Ocean energy, water energy and other energy sources. For this reason, the governments of various countries attach great importance to the development and utilization of solar energy, and the development and utilization of solar energy has become a hot research field that governments have i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J23/75B01J21/06B01J37/02
Inventor 刘福生刘恋恋李振刘忠祥卢南方婷李玲朱涛
Owner NANJING FORESTRY UNIV
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