Preparation and characterization of red mud sintered porous materials for water defluoridation |
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| Affiliation: | 1. School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China;2. Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53141-2000, USA;1. National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China;2. Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan, Jinan 250022, China;2. National Laboratory of Mineral Materials, School of Material Science and Technology, China University of Geosciences, Beijing 100083, China;3. Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. Chemistry Department, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia;2. Chemistry Department, Dilla University, P.O. Box 419, Dilla, Ethiopia;3. Instituto de Catálisis y Petroleoquímica, CSIC, c/Marie Curie 2, 28049, Madrid, Spain;4. Advanced Microscopy Laboratory (LMA), Nanoscience Institute of Aragon (INA), University of Zaragoza, Zaragoza, Spain;1. Analytical Discipline & Centralized Instruments Facility, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific & Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India;2. Process Design and Engineering Cell, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific & Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India;3. Department of Chemistry, Krantiguru Syamji Krishna Verma Kuchchh University, Mundra Road, Kuchchh, 370 001, Gujarat, India |
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| Abstract: | This research was undertaken to characterize a porous material prepared from red mud and to investigate the capacity of zirconium hydroxide-modified red mud porous materials (Zr-modified RMPMs) for the removal of fluoride from aqueous solutions. An organic foam template was used for the preparation. After sintering, the RMPM had a porosity up to 80 % with the pore size controlled between 50 and 100 μm. Batch experiments were performed to study the defluoridation of water using Zr-modified RMPM under various experimental conditions. Kinetic data revealed that the equilibrium for fluoride removal was achieved within 60 min. The fluoride sorption process was well fitted to the pseudo-second-order rate kinetics and pore diffusion models. The optimum fluoride removal was observed between pH range 3 and 4 and the adsorption capacity for fluoride by Zr-modified RMPM was 0.6 mg/g. Results from this study demonstrated potential use of Zr-modified RMPM in defluoridation of drinking water. |
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