Efficiency and mechanism of fluoride removal by electroadsorption of alumina modified activated carbon fiber
WEI Yong1,2, LI Xian-jian1,2, LUO Zheng-bo2, LI Ke-ying1, GUO Zi-yin2, SHI Rong-kai1
1. School of Urban Construction, Changzhou University, Changzhou 213164, China; 2. School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
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.
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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