氧化铝改性活性炭纤维电吸附除氟效能及机理

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摘要采用溶胶-凝胶法制备氧化铝(Al₂O₃)凝胶,将Al₂O₃凝胶涂覆在活性炭纤维(ACF)表面,进行热处理后制备改性电极(ACF-Al),并通过SEM、XRD及孔径分析对其进行表征.其次,采用配水试验考察电吸附除氟性能,结果表明,在相同试验条件下,选择氟化钠为目标去除物,ACF-Al的电吸附容量较ACF提升了约1倍,通过响应面试验优化后得出最优运行参数:电压2.5V、浓度15mg/L及pH5.72.此外,通过设置两对电极除氟,其出水水质可进一步提高并满足饮用水卫生标准.该电极具有良好的稳定性和循环使用性能,经过多次循环再生后,吸附量未发现明显减少.最后,考察其电吸附机理,通过除氟曲线拟合符合Langmuir吸附等温模型,吸附动力学遵循准一级动力学模型,并结合傅里叶变换红外光谱和X射线光电子能谱分析,发现氟离子的吸附机理不仅包含物理电吸附,还在ACF-Al表面通过离子交换,取代了-OH基团发生化学吸附.

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	魏永
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	郭子寅
	施荣凯

关键词 ：氧化铝改性, 活性炭纤维, 电吸附, 除氟, 化学吸附

Abstract：The modified electrode (ACF-Al) was prepared by coating alumina (Al₂O₃) gel on the surface of activated carbon fiber (ACF) with sol-gel method and heating treatment, and the obtained electrode was characterized with the SEM, XRD and pore size analysis. Subsquently, The artificial wastewater was tested in the lab to evaluate the electroadsorption performance of fluoride removal. Results showed that the modified ACF-Al electrode inhabited twice the capacity than the original ACF electrode on sodium fluoride adsorption. The operating parameters were optimized by response surface test with a result of voltage 2.5V, concentration 15mg/L, and pH 5.72 separately. Moreover, the treatment performance can be further improved by application of two pairs of electrodes, so that the effluent water quality could meet the sanitary standard of drinking water. This novel electrode showed good stability that the adsorption capacity was little reduced after several cycles of regeneration. Finally, the adsorption mechanism was investigated with the simulation of the Langmuir isotherm model, as well as the analysis of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Results showed that the adsorption kinetics followed the pseudo-first-order kinetics model, and this process was accomplished by physical electroadsorption, and ion replaces of -OH group on ACF-Al surface through ion exchange and chemisorption.

Key words： alumina modification activated carbon fiber electroadsorption defluorination chemisorption

收稿日期: 2022-12-30

PACS:

X522

基金资助:2022年江苏省科技副总项目(FZ20220784)；常州市社会发展科技支撑计划项目(CE20195032)

通讯作者: 魏永,副教授,weiyong@cczu.edu.cn E-mail: weiyong@cczu.edu.cn

作者简介: 魏永(1975-),男,江苏徐州人,副教授,博士,主要从事水处理理论与技术研究.发表论文50余篇.weiyong@cczu.edu.cn

引用本文:

魏永, 李贤建, 罗政博, 李克英, 郭子寅, 施荣凯. 氧化铝改性活性炭纤维电吸附除氟效能及机理[J]. 中国环境科学, 2023, 43(8): 3974-3982. WEI Yong, LI Xian-jian, LUO Zheng-bo, LI Ke-ying, GUO Zi-yin, SHI Rong-kai. Efficiency and mechanism of fluoride removal by electroadsorption of alumina modified activated carbon fiber. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3974-3982.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I8/3974

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