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A kind of ternary z-type structure photocatalyst and its preparation method and application

A technology of structured light and catalyst, applied in the field of photocatalysis, can solve the problems of less catalyst and easy recombination, and achieve the effects of stable properties, improved efficiency and improved efficiency

Active Publication Date: 2020-04-10
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if it is to be carried out at the same time, a problem with this semiconductor photocatalytic technology is that photogenerated electrons and hole pairs are easy to recombine.
The photocatalytic system must carry out both oxidation reaction and reduction reaction, and its catalyst must have sufficient bandwidth, but there are few semiconductor catalysts that meet this requirement.

Method used

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  • A kind of ternary z-type structure photocatalyst and its preparation method and application
  • A kind of ternary z-type structure photocatalyst and its preparation method and application
  • A kind of ternary z-type structure photocatalyst and its preparation method and application

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Effect test

Embodiment 1

[0033] Embodiment 1 Novel ternary Z-type structure photocatalyst

[0034] (1) The preparation method is as follows

[0035] 1. Preparation of NiGa 2 o 4 nano powder

[0036] 1.88g Ga 2 o 3 The powder was added to 50 mL of nickel nitrate solution, and the resulting mixture was adjusted to pH 12 with sodium hydroxide (stirring for 30 min while adjusting), and the obtained suspension solution was transferred to a reaction kettle, reacted at 180 ° C for 48 h, cooled to room temperature, and obtained shallow The blue precipitate was washed several times with deionized water, and the obtained precipitate was dried at 60° C. for 8 hours to obtain a powder. Grind the powder finely, bake it in a muffle furnace at 500°C for 2 hours, take it out and then grind it to get NiGa 2 o 4 Nano powder.

[0037] 2. Preparation of NiS 2 nano powder

[0038] Take 0.12g NiCl 2 ·6H 2 O powder and 0.07g of sulfur powder were added to 12.00mL of ethylenediamine and 4.00ml of ethylene glycol ...

Embodiment 2

[0055] Embodiment 2 A kind of novel ternary Z type structure photocatalyst NiGa 2 o 4 / NiS 2 / WO 3 Application in photocatalytic conversion of nitrite and sulfite

[0056] (1) Effect of simulated sunlight irradiation time and corresponding reaction kinetics on the photocatalytic conversion rate of nitrite and sulfite

[0057] Method: 0.05g NiGa 2 o 4 / NiS 2 / WO 3 Add the nano powder into 50mL aqueous solution containing 10ppm nitrite and 18.2ppm sulfite, adjust pH=5.00, and irradiate with 500W xenon lamp for 4.0h.

[0058] NiGa under simulated sunlight irradiation 2 o 4 / NiS 2 / WO 3 Photocatalytic conversion of nitrite and sulfite by photocatalysts. Before light exposure, will contain NO 2 - and SO 3 2- The solution was stirred for 30 min in the dark and reached adsorption-desorption equilibrium. Then, solution samples were taken every 1.0 hour, and the conversion of nitrite and sulfite was checked by ion chromatography. from Figure 5a It can be seen that wit...

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Abstract

The invention relates to a new type of ternary Z-shaped structural photocatalyst and its preparation method and application. The new ternary Z-shaped structure photocatalyst NiGa 2 O 4 / NiS 2 / WO 3 Prepared by hydrothermal method and calcination method, with NiGa 2 O 4 / WO 3 Compared to adding NiS 2 Form NiGa 2 O 4 / NiS 2 / WO 3 Finally, due to NiS 2 As a conductive electron, it can speed up the flow of electrons and inhibit the combination of electron-hole pairs, making NiGa 2 O 4 / NiS 2 / WO 3 The photocatalytic system exhibits excellent photocatalytic performance, and the results show that the ternary Z-shaped structure photocatalyst NiGa 2 O 4 / NiS 2 / WO 3 It has stable and efficient photocatalytic activity and has broad application prospects in nitrite and sulfite wastewater treatment.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a novel ternary Z-type structure photocatalyst NiGa 2 o 4 / NiS 2 / WO 3 Its preparation method and application in photocatalytic conversion of nitrite and sulfite. Background technique [0002] Recently, water shortage and water famine have become difficult problems plaguing human beings. Water pollution caused by various pollutants not only exacerbates the water shortage situation, but also leads to inevitable public health problems. Among them, the impact of nitrite pollution on the environment and organisms has been recognized by people, whether it is to humans themselves, or to animals and plants, it can cause direct or indirect harm. After the groundwater with high concentration of nitrite is drunk by people, the ferrous iron in human blood can be oxidized to trivalent iron. As a result, hemoglobin is transformed into methemoglobin or denatured hemoglobin, thus ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/049C01C1/245C02F1/30C02F1/70C02F1/72C05C3/00C02F101/10C02F101/16
CPCC01C1/245C02F1/30C02F1/70C02F1/725C05C3/00B01J27/049C02F2305/10C02F2101/166C02F2101/101B01J35/50B01J35/39B01J35/40Y02W10/37
Inventor 宋有涛马雪王春权王国伟王君
Owner LIAONING UNIVERSITY