Bulletin of the Chinese Ceramic Society, Volume. 41, Issue 2, 625(2022)
Adsorption Property of Pb(Ⅱ) to Magnetic Red Mud Modified by Alcohol-Amine Titanate
Magnetized red mud adsorption material (ATMMRM) modified by alcohol-amine titanate was prepared from industrial solid waste red mud (RM) after reducing calcination and grafting modification. Using XRD, FT-IR, SEM, BET, VSM and other characterization methods to characterize and compare RM and ATMMRM. The results show that the surface of ATMMRM is successfully introduced with hydroxyl and amine groups, and the specific surface area and saturation magnetization of ATMMRM are 6.0 and 9.6 times higher than those before modification, respectively. These properties provide more active adsorption sites for the adsorption of Pb(Ⅱ) by ATMMRM and endow the material with magnetic separation ability. The results of static adsorption experiments show that the saturated adsorption capacity of ATMMRM for Pb(Ⅱ) in aqueous solution reach 213 mg·g-1 at pH=6 and T=25 ℃. The adsorption process of Pb(Ⅱ) from aqueous solution by ATMMRM conforms to Langmuir isotherm model and pseudo-second-order kinetic equation, and is controlled by chemisorption process with spontaneous endothermic entropy increase. The main adsorption mechanism are physical adsorption and chelation of Pb(Ⅱ) with hydroxyl and amine groups grafted on the surface of ATMMRM.
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LI Chen, LU Jingjing, MENG Mei, LIU Jing, XIE Yan, CHEN Qianlin, AO Xianquan, CAO Yang, YANG Min. Adsorption Property of Pb(Ⅱ) to Magnetic Red Mud Modified by Alcohol-Amine Titanate[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(2): 625
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Received: May. 24, 2021
Accepted: --
Published Online: Aug. 6, 2022
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