Journal
APPLIED SURFACE SCIENCE
Volume 375, Issue -, Pages 74-84Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.03.005
Keywords
Ultrafine tea powder; Ball-milling; Adsorption; Fluoride; Zirconium(IV)
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Funding
- Earmarked Fund for Modern Agro-industry Technology Research System in Tea Industry (Ministry of Agriculture of P.R. China) [CARS-23]
- Changjiang Scholars and Innovative Research Team in University [IRT1101]
- China Postdoctoral Science Foundation [2015M581973]
- Natural Science Foundation of Anhui Province [1408085MKL38]
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A low-cost and highly efficient biosorbent was prepared by loading zirconium(IV) onto ball-milled, ultra-fine tea powder (UTP-Zr) for removal of fluoride from drinking water. To evaluate the fluoride adsorption capacity of UTP-Zr over a wide range of conditions, the biosorbent dosage, contact time, initial pH, initial fluoride concentration and presence of other ions were varied. UTP-Zr performed well over the considerably wide pH range of 3-10. The residual concentration of Zr in the treated water was below the limit of detection (0.01 mg/L). Fluoride adsorption by the UTP-Zr biosorbent followed the Langmuir model, with a maximum adsorption capacity of 12.43 mgF/g at room temperature. The fluoride adsorption kinetics fit the pseudo-second-order kinetic model. The synthesized biosorbent was characterized by BET, SEM, EDS, XRD and XPS to reveal how UTP-Zr interacts with fluoride. Results from this study demonstrated that UTP-based biosorbents will be useful and safe for the removal of fluoride from drinking water. (C) 2016 Elsevier B.V. All rights reserved.
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