Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr3+ removal and recycling |
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| Affiliation: | 1. School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi''an 710021, PR China;2. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi''an 710021, PR China;3. School of Arts and Sciences, Shaanxi University of Science and Technology, Xi''an 710021, PR China;1. Anhui Key Lab of Metal Materials and Processing, School of Materials Science and Engineering, Anhui University of Technology, 243002 Ma’anshan, People’s Republic of China;2. Department of Metallurgy and Materials Engineering (MTM), KU Leuven, B-3001 Heverlee, Belgium;1. Perugia University, Department of Pharmaceutical Sciences, Via del Liceo 1, 06123 Perugia, Italy;2. Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy;1. High Temperature Materials Institute, Henan University of Science & Technology, Luoyang, 471003, China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;3. Shanxi Institute of Technology, Yangquan, 045000, China;4. Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou, 450052, China;5. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, UK |
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| Abstract: | A novel zirconium-pillared montmorillonite (Zr-Mt) porous ceramic (P-ZMt) for Cr3+ removal was developed by gelcasting. P-ZMt was characterized by XRD, SEM, XPS, TEM, BET. The influence of pH value, contact time, temperature and initial concentration on the adsorption efficiency was investigated. The results revealed that the P-ZMt has a high removal efficiency of Cr3+ over a broad range of pH value. The pseudo-second-order kinetic model fitted our acquired Cr3+ adsorption data best, in comparison with the pseudo-first-order kinetic model. The Langmuir model was applied to fit the adsorption process better than that of the Freundlich model. The thermodynamic parameters (∆H, ∆G and ∆S) were also determined, which revealed that the Cr3+ adsorption process was spontaneous in nature. The present developed P-ZMt could be recovered and reused for more than 6 times. The novel developed P-ZMt is an inexpensive, effective and long-life-cycle adsorbent for Cr3+ removal from water solution. |
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| Keywords: | Zirconium-pillared montmorillonite Gelcasting Porous Adsorption Recycling |
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