改性Cu-Pd双金属电极电化学还原硝酸盐性能研究

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Abstract A NF/CNTs/Cu-Pd bimetallic composite electrode was effectively synthesized using the cathodic electrodeposition technique. The objective was to achieve efficient electrocatalytic reduction of nitrate in wastewater. SEM-EDS, XRD, and XPS analysis confirmed the successful deposition of Cu-Pd nanoparticles onto the nickel foam (NF) substrate. The efficacy of NO₃^--N and TN removal in simulated water was investigated by manipulating various factors, including current density, initial pH value, initial nitrate concentration, and Cl^- concentration. The approach was also applied to actual saline wastewater to validate its feasibility. The results showed that NF/CNTs/Cu-Pd exhibited effective NO₃^--N removal capabilities without Cl^-, while TN removal efficiency was relatively modest, with NO₃^--N primarily converted into NH₄⁺-N. However, in the presence of Cl^-, both NO₃^--N and TN were efficiently removed. The optimal reaction conditions were determined to be a current density of 30mA/cm², an initial pH value of 7, an initial concentration of 50mg/L, and a chloride ion concentration of 2.0g/L. Under optimal conditions, the removal efficiencies of NO₃^--N and TN reached 100% and 97.2%, respectively. The presence of dissolved organic matter (DOM) in actual wastewater could impede NO₃^--N removal. After removing the DOM, the removal efficiency of NO₃^--N decreased to 95.5%, and the TN removal efficiency declined to 85.6%.

Key words： nitrate reduction NF/CNTs/Cu-Pd electrode electrodeposition high-salt wastewater

Received: 23 February 2023

PACS:

X703.1

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	WANG Chang
	LIU Ji-ming
	WANG Yong-heng
	LU Xin-yu

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WANG Chang,LIU Ji-ming,WANG Yong-heng等. Study on the electrochemical reduction of nitrate using a modified Cu-Pd bimetallic electrode[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5196-5207.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5196

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