锆铝等双金属改性生物炭同步去除水中As(V)和F

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Abstract To deal with problems such as high concentration of arsenic (As) and fluorine (F) in water, along with difficulty in dealing with complex pollution and irrigation utilization, zirconium-aluminum modified biochars were synthesized to study their adsorption efficiency and mechanism of As and F. The study was conducted to explore the impact of initial concentration, adsorption time, pH, and co-existing ions on their adsorption. The combination of SEM, BET, FTIR, and X-ray techniques were applied to characterize and analyze the materials. The results showed that zirconium-aluminum bimetallic modified biochar (ZA-BC) was an excellent mesoporous biochar with a good pore structure, which can rapidly adsorb As and F ions within 6hours. With initial concentrations of 1mg/L for As and 5mg/L for F, and a biochar dosage of 1g/L, As and F removal rates can reach 98.7% and 95.2%. The optimal adsorption pH of As and F by ZA-BC was 4~5, the zero charge point of the material was 9.1. Its adsorption fits the Langmuir isotherm and pseudo-second-order kinetic models within a pH range of 4.0~9.1. ZA-BC adsorbed As and F at 19.62 and 28.70mg/g, respectively, with CO₃^2- most affecting its efficiency. ZA-BC's adsorption of As involved electrostatic attraction and surface complexation, whereas for F, it's primarily electrostatic and ion exchange. The hydroxyl group was vital for adsorption, with metal modifications enhancing the immobilization of As and F via M-OH groups. Comprehensive tests had shown that ZA-BC was a promising adsorbent for removing arsenic and fluoride from water.

Key words： bimetallic-modified biochar arsenic fluorine adsorption mechanis

Received: 30 August 2024

PACS:

X703.5

Corresponding Authors: 罗艳丽,副教授,luoyanlimail@sina.com E-mail: luoyanlimail@sina.com

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	SONG Zhen
	LUO Yan-li
	WANG Mei-juan
	HE Jia-le
	ZHANG Qian
	XIE Xin-zhe

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SONG Zhen,LUO Yan-li,WANG Mei-juan等. Zirconium-aluminum dual-metal modified biochar for simultaneous removal of As(V) and F from water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1308-1320.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1308

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