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La/Co@TiO2 nanosphere catalyst as well as preparation method and application thereof

A nanosphere and catalyst technology, applied in the field of La/Co@TiO2 nanosphere catalyst and its preparation, can solve the problems of easy recombination of photogenerated electrons and self-holes, loss of active sites on the surface of catalysts, and reduced photocatalytic efficiency, etc. To achieve the effect of strong recyclability, improve photocatalytic efficiency, and improve catalytic efficiency

Active Publication Date: 2021-08-03
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most photocatalysts are based on TiO 2 However, due to the limitations of the catalyst itself, this type of photocatalyst is prone to photogenerated electrons and its own holes are prone to recombination, resulting in the loss of active sites on the surface of the catalyst, thereby reducing the photocatalytic activity. efficiency, hindering its further development

Method used

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  • La/Co@TiO2 nanosphere catalyst as well as preparation method and application thereof
  • La/Co@TiO2 nanosphere catalyst as well as preparation method and application thereof
  • La/Co@TiO2 nanosphere catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A bimetallic La / Co@TiO 2 The preparation method of nanosphere catalyst comprises:

[0048] 1) TiO 2 Preparation of nanospheres: Mix 2mL tetrabutyl titanate with 50mL absolute ethanol, ultrasonically disperse, then add 40mL HCl (0.2mol / L) solution dropwise, stir at room temperature for 2h, let stand for 24h, wash by centrifugation, and dry overnight at 120°C , and finally in the atmosphere of nitrogen and hydrogen, at 5K·min -1 The heating rate was annealed at 450°C for 4h in a muffle furnace to prepare TiO 2 nanosphere catalyst.

[0049] 2) Bimetallic La / Co@TiO 2 Preparation: 1.0g TiO prepared above 2 and 1.0g polyvinylpyrrolidone (PVP) powder were first dispersed in 150mL ultrapure water, and after ultrasonic dispersion, sequentially added (La(NO) 3 ·6H 2 O)(48mg) and (Co(NO) 3 ·6H 2 O) (72mg), continue to sonicate for 10min, transfer the mixture to a water bath at 72°C, and stir for 8h. After cooling, centrifuge, and finally under the atmosphere of nitrogen ...

Embodiment 2～7 and comparative example 1～3

[0051] Part of the reaction conditions in Examples 2 to 7 and Comparative Examples 1 to 3 are shown in Table 1, and the rest are the same as in Example 1.

[0052] Table 1

[0053]

[0054]

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Abstract

The invention relates to a La / Co@TiO2 nanosphere catalyst and a preparation method and application thereof. The preparation method includes the steps that a TiO2 nanosphere sol solution is prepared through a sol-gel method, washing, drying and high-temperature annealing are conducted so as to obtain TiO2 nanospheres, then a lanthanum source and a cobalt source are loaded on TiO2 through a co-impregnation method, and calcination is conducted to obtain the La / Co@TiO2 nanosphere catalyst. Compared with the prior art, the invention has the advantages that preparation conditions are mild, operation process is simple, and photocatalytic degradation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a La / Co@TiO 2 Nanosphere catalyst and its preparation method and application. Background technique [0002] Organic wastewater has potential hazards to the environment and human health. How to efficiently purify organic wastewater has become a research hotspot in the field of environment. Traditional physical adsorption, microbial degradation, and catalytic oxidation technologies cannot completely eliminate organic matter in wastewater. However, photocatalytic technology has an outstanding effect in purifying wastewater. It is well known that there are a large number of molecular oxygen oxidants in sewage, however, due to the O 2 The spin prohibits two-electron reduction, and most organic pollutants in sewage cannot be oxidized. Studies have shown that photocatalytic technology can excite oxygen molecules on the surface of semiconductors to activate them into reactive o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/08C02F1/30C02F101/30C02F101/38
CPCB01J23/83C02F1/30C02F2305/10C02F2101/308C02F2101/40C02F2305/023B01J35/51B01J35/39Y02W10/37
Inventor 王磊左宁马莹莹张梦竹李书珍
Owner SHANGHAI INST OF TECH
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