Preparation method of p-NiO/n-CdS/TiO2 composite semiconductor photochemical catalyst

A compound semiconductor and photocatalyst technology, applied in the field of photocatalytic materials, can solve problems such as ineffective effects, achieve the effects of reducing photocorrosion, improving photocatalytic efficiency, and prolonging service life

Inactive Publication Date: 2012-08-22
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] TiO 2 Sol preparation

[0034] Tetrabutyl titanate: 21.25%

[0035] Absolute Ethanol: 63.75%

[0036] 35% hydrochloric acid: 5%

[0037] Deionized water: 10%

[0038] TiO 2 Preparation of sol: According to the above mass percentage, mix tetrabutyl titanate, absolute ethanol, 35% hydrochloric acid and deionized water, stir and react at room temperature for 20h, and then use the frequency at 30KH Z , an ultrasonic disperser with a power of 800W disperses for 2h to obtain TiO 2 Sol;

[0039] CdS / TiO 2 Preparation of solid powder:

[0040] Prepared TiO 2 Sol: 60%

[0041] Anhydrous cadmium chloride: 1.3%

[0042] Thiourea: 1%

[0043] Deionized water: 37.7%

[0044] CdS / TiO 2 Preparation of solid powder: according to the above mass percentage, the prepared TiO 2 Sol, anhydrous cadmium chloride, thiourea and deionized water are mixed at a frequency of 30KH Z , Under ultrasonic dispersion with a power of 800W, react at 80°C for 10h, then filter to obtain a sol...

Embodiment 2

[0052] TiO 2 Sol preparation

[0053] Tetraisopropyl titanate: 39%

[0054] Isopropanol: 40%

[0055] 65% nitric acid: 5%

[0056] Deionized water: 16%

[0057] TiO 2 Preparation of sol: According to the above mass percentage, mix tetraisopropyl titanate, isopropanol, 65% nitric acid and deionized water, stir and react at room temperature for 20h, and then use the frequency at 30KH Z , an ultrasonic disperser with a power of 800W disperses for 2h to obtain TiO 2 Sol;

[0058] CdS / TiO 2 Preparation of solid powder:

[0059] Prepared TiO 2 Sol: 45.5%

[0060] Anhydrous cadmium bromide: 1.6%

[0061] Thiourea: 1%

[0062] Deionized water: 51.9%

[0063] CdS / TiO 2 Preparation of solid powder: according to the above mass percentage, the prepared TiO 2 Sol, anhydrous cadmium bromide, thiourea and deionized water are mixed at a frequency of 30KH Z , Under ultrasonic dispersion with a power of 800W, react at 80°C for 10h, then filter to obtain a solid powder cake, add ...

Embodiment 3

[0071] TiO 2 Sol preparation

[0072] Tetra-n-propyl titanate: 284 24.9%

[0073] Absolute Ethanol: 44.1%

[0074] Isopropanol: 10%

[0075] Sulfuric acid: 3%

[0076] Deionized water: 18%

[0077] TiO 2 Preparation of sol: According to the above mass percentage, mix tetra-n-propyl titanate, absolute ethanol, isopropanol, sulfuric acid and deionized water, stir and react at room temperature for 20 hours, and then use the frequency at 30KH Z , an ultrasonic disperser with a power of 800W disperses for 2h to obtain TiO 2 Sol;

[0078] CdS / TiO 2 Preparation of solid powder:

[0079] Prepared TiO 2 Sol: 50%

[0080] Anhydrous cadmium sulfate: 1.3%

[0081] Thiourea: 1.4%

[0082] Deionized water: 47.3%

[0083] CdS / TiO 2 Preparation of solid powder: according to the above mass percentage, the prepared TiO 2 Sol, anhydrous cadmium sulfate, thiourea and deionized water are mixed at a frequency of 30KH Z , Under ultrasonic dispersion with a power of 800W, react at 80...

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PUM

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Abstract

The invention discloses a preparation method of a p-NiO / n-CdS / TiO2 composite semiconductor photochemical catalyst, which comprises the steps of: firstly, with titanate, alcohol, acid, thiocarbamide and deionized water as raw materials, preparing TiO2 gel; secondly, with the prepared TiO2 gel, a cadmium salt, thiocarbamide and deionized water as raw materials, sequentially carrying out treatmentssuch as reaction, ultrasonic dispersion, decompression distillation, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and the like to obtain CdS / TiO2 solid powder; and thirdly, with the obtained CdS / TiO2 solid powder, a nickel salt, ammonia water and deionized water as raw materials, sequentially carrying out treatments such as reaction, ultrasonic dispersion, decompression distillation, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and the like to obtain the p-NiO / n-CdS / TiO2 composite semiconductor photochemical catalyst. Through compounding a p-type semiconductor NiO with n-type semiconductors CdS and TiO2, the light corrosion rate of the CdS is decreased; photoproduced electronics are effectively separated from the holes, thus the service life of the CdS is prolonged, and the photochemical catalysis efficiency of the p-NiO / n-CdS / TiO2 composite semiconductor photochemical catalyst is increased. The method is simple, convenient and practical, and is beneficial to popularization.

Description

technical field [0001] The invention relates to a p-NiO / 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 invested heavily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043C01B3/04C02F1/30C02F101/30
CPCY02E60/364Y02E60/36
Inventor 刘福生刘忠祥李振卢南刘恋恋朱涛方婷李玲
Owner NANJING FORESTRY UNIV
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