Ag<sub>2</sub>O/TiO<sub>2</sub>催化剂可见光催化脱硝性能

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Abstract Anatase TiO₂ was prepared by hydrothermal method and compounded with Ag₂O to construct a catalyst. BET, XRD, XPS and other catalysts were used to characterize and analyze the catalysts, and NO was used as the treatment object to explore the influence of reaction conditions on the denitrification efficiency of the catalysts. The results showed that under visible light, when the NO concentration in the reaction system was 23.6mg/m³ and the molar ratio of ammonia to nitrogen was 1:1, the best denitrification efficiency of Ag₂O/TiO₂ (10%) was 92.00%. Further exploration found that the denitrification efficiency remained basically unchanged by changing the flue gas humidity in the reaction system. And when CO₂, SO₂, NO and other gases are present at the same time, the denitrification efficiency can be maintained at 71.43%. The characterization results showed that the specific surface area increased, the band gap width decreased, the PL peak intensity decreased, and the photocurrent density increased after recombination with Ag₂O. After the reaction, the catalyst has a nitro asymmetric stretching vibration peak, so it is speculated that during the reaction process, ·O₂^-,·OH,·O radicals act as an oxidant to oxidize NO to NO₂ and then further oxidize to NO₃^- to achieve NO_x removal. When NH₃ and NO₂ exist at the same time, the incomplete reaction of NO is further reduced to N₂, which promotes the conversion of pollutant gases and further improves the denitrification efficiency.

Key words： Ag₂O/TiO₂ visible light catalysis denitration

Received: 12 March 2024

PACS:

X705

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	Articles by authors
	WANG Shu-qin
	DONG Jian-xin
	LI Jin-meng

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WANG Shu-qin,DONG Jian-xin,LI Jin-meng. Study on visible light catalytic denitrification performance of Ag₂O/TiO₂ catalyst[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5397-5405.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I10/5397

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