催化反硝化脱氮效果及反应机制的研究

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Abstract In order to resolve nitrate pollution in water body, the novel catalytic denitrification by synergistic effect of zero-valent iron (Fe⁰) and Pd-Cu catalyst was proposed. The optimization of operational conditions, reaction mechanism, and kinetic study were further investigated. Results found that using response surface methodology for experimental design and data analyses, 74.6% of N₂ conversion was obtained under the following optimal conditions:5.0pH, 135min reaction time, 3.1mass ration (Pd:Cu), and 3.1g/L Fe⁰. In the catalytic process, Fe⁰primarily serves as the electron donor. Pd and Cu coated on the carrier play critical roles in catalytic denitrification. Physical-chemical characteristics of carrier (such as porous structure, specific surface area, adsorption ability etc.) dramatically influence the catalytic performance. It's also found that N₂conversion could be greatly improved by controlling solution pH, acid wash of carrier, and replacement of catalyst's active ingredient. Catalytic reduction of nitrate was better demonstrated by first-order equation of Langmuir-Hinshelwood modeling. Catalytic denitrification has been regarded as the typical multiphase and multistage reaction process. Acid and alkaline wash by certain concentration of HCl or NaOH solution may partially regenerate the catalyst and improve its catalytic performance.

Key words： water pollution nitrate catalytic denitrification response surface methodology Langmuir-Hinshelwood modeling

Received: 09 March 2023

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X703.1

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	Articles by authors
	YUN Yu-pan
	MIAO Zhi-jia
	WANG Xiao-lei
	WANG Wei-yan
	YU Hai-tao

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YUN Yu-pan,MIAO Zhi-jia,WANG Xiao-lei等. Study on catalytic performance and reaction mechanism of catalytic denitrification[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5131-5138.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5131

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