生物碳基纳米钯铜催化剂的优化制备及脱硝研究

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Abstract The biochar-based nano palladium-copper bimetallic catalysts (Nano-PdCu-BC) were prepared by wet chemical- immersion reduction method aiming to break through the current technical bottleneck of efficient treatment of nitrate pollution in water. The influences of catalyst preparation precursor concentration, initial nitrate concentration, current intensity, catalyst dosage and initial pH value on electrocatalytic reduction of NO₃^-N were investigated in this study. The results showed that the palladium copper bimetal could be successfully loaded on the biochar of bamboo by impregnation and reduction, and the Nano-PdCu-BC bimetal catalyst could be obtained. Under the conditions that the precursor solution is 0.60g/L PdCl₂ and 0.15g/L CuCl₂, the initial NO₃^-N concentration is 100mg/L, the current intensity is 220mA, the initial pH value is 7, and the catalyst dosage is 0.80g/L, the removal rate of NO₃^-N reached 99.68%, and the selectivity of N₂ was about 44.25% after 180min. The reaction of Nano-PdCu-BC electrocatalytic reduction of NO₃^-N conforms to the first-order kinetics with a kinetics constant k-value of 0.034/min. After three cycles of reuse, the removal rate of NO₃^-N remains above 95%, and the selectivity of N₂ remains above 40%. Moreover, the mechanism of electrocatalytic reduction of nitrate by Nano-PdCu-BC bimetallic catalyst was revealed. After adsorption of NO₃^-N by nano-zero-valent Cu, it was oxidized to CuO, which provided electrons to promote the reduction of NO₃^-N to NO₂-N, and then in synergy with nano-zero-valent Pd to indirectly reduce NO₃^-N by activating atomic hydrogen (H^*) for adsorption, achieving the purpose of reducing NO₃^-N to NH₄or N₂.

Key words： Bamboo Biochar Nitrate Nano-Pd-Cu catalyst Electrocatalytic reduction Hydrogen Radical

Received: 04 October 2023

PACS:

X703.5

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	Articles by authors
	MO Xiao-xin
	ZHANG Li-hao
	WU Yu-qing
	DONG Yi
	ZHU Zong-qiang
	ZHU Yi-nian

Cite this article:

MO Xiao-xin,ZHANG Li-hao,WU Yu-qing等. Preparation of biochar-based palladium-copper nano-catalysts and optimization of denitrification performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2460-2472.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I5/2460

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