不同晶型锰氧化物去除地下水中氨的效能与机理

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Abstract The efficiency and mechanism of removing ammonium from groundwater by manganese dioxide with three different crystal forms (α-MnO₂, γ-MnO₂, δ-MnO₂) were studied, and the practical application efficiency of the filter column filled with γ-MnO₂ coated filter media was investigated. The experimental results showed that γ-MnO₂ possessed the best catalytic oxidation activity for removing ammonium (γ-MnO₂>α-MnO₂>δ-MnO₂), 5mg/L NH₄⁺-N could be completely removed on the 20th day, and the accumulation time of nitrite was the shortest and the peak value was the lowest. The filter column filled with γ-MnO₂ coated filter media could quickly (the 6^th day) form excellent catalytic activity, when the influent NH₄⁺-N was 2.0mg/L, the effluent NH₄⁺-N was lower than the standard limit (<0.5mg /L). Combined with the characterization analysis, it was found that the highest catalytic activity of γ-MnO₂ was mainly due to its higher average manganese oxidation state and abundant surface hydroxy oxygen, and its electron transport ability was the strongest. This study provides theoretical guidance for the application of manganese oxides in the field of ammonium removal from drinking water. γ-MnO₂ coated filter media has good catalytic oxidation stability and efficiency, and provides a new perspective for the preparation of catalytic oxidation active filter media in practical engineering.

Key words： crystal forms manganese oxide ammonium catalytic oxidation groundwater

Received: 12 February 2024

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X523

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	CHENG Ya
	MIAO An-qi
	HUANG Ting-lin
	WEN Gang

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CHENG Ya,MIAO An-qi,HUANG Ting-lin等. Efficiency and mechanism of removing ammonium from groundwater by manganese oxides with different crystal forms[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4978-4986.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I9/4978

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