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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摘要针对水体中砷(As)、氟(F)浓度超标,复合污染难处理,造成水污染和难以灌溉利用等问题,本文制备了锆铝等双金属改性生物炭,研究其对水中As和F的吸附效果和吸附机制.研究探索了初始浓度、吸附时间、pH值、共存离子等因素对吸附的影响,并结合扫描电镜、比表面积仪、红外光谱、X射线等技术对材料进行表征和分析.结果表明:锆铝双金属改性生物炭(ZA-BC)是孔隙结构优良的介孔型生物炭,能在6h内快速吸附水中As、F离子.当初始As、F浓度为1和5mg/L,炭投加量为1g/L时,对As、F的去除率可达98.7%和95.2%. ZA-BC对As、F的最优吸附pH值为4~5,零电荷点pH=9.1,具有较宽的pH值使用范围4.0~9.1,其等温吸附符合Langmuir模型,动力学吸附符合拟二级动力学模型,对As、F的最大吸附容量为19.62和28.70mg/g,CO₃^2-是对吸附效果影响最大的共存离子.ZA-BC对As的吸附机制主要为静电引力和表面络合,对F的吸附机制主要为静电引力和离子交换.羟基(-OH)是吸附过程中起关键作用的物质,金属改性可为炭表面新增大量金属羟基(M-OH),M-OH可通过络合作用和离子交换作用对As、F进行化学固定.各种综合性测试表明, ZA-BC是一种很有前途的去除水中As、F的吸附材料.

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	宋振
	罗艳丽
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	何佳乐
	张千
	解新哲

关键词 ：双金属改性, 生物炭, 砷, 氟, 吸附机制

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

收稿日期: 2024-08-30

PACS:

X703.5

基金资助:国家自然科学基金资助项目(42067053)

作者简介: 宋振(1999-),男,安徽六安人,新疆农业大学硕士研究生,主要从事水环境污染治理研究.发表论文1篇.3238557138@qq.com.

引用本文:

宋振, 罗艳丽, 王美娟, 何佳乐, 张千, 解新哲. 锆铝等双金属改性生物炭同步去除水中As(V)和F[J]. 中国环境科学, 2025, 45(3): 1308-1320. SONG Zhen, LUO Yan-li, WANG Mei-juan, HE Jia-le, ZHANG Qian, XIE Xin-zhe. Zirconium-aluminum dual-metal modified biochar for simultaneous removal of As(V) and F from water. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1308-1320.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I3/1308

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