Enhanced removal of fluoride by zirconium modified tea waste with extrusion treatment: kinetics and mechanism
| Autor: | Chuanyi Peng, Huimei Cai, Huanhuan Qiao, Liang Jin, Fei Ke, Liping Mei, Ruyan Hou, Xiaochun Wan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Zirconium
Materials science Scanning electron microscope General Chemical Engineering Langmuir adsorption model chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound symbols.namesake Adsorption chemistry X-ray photoelectron spectroscopy symbols Extrusion Fourier transform infrared spectroscopy 0210 nano-technology Fluoride Nuclear chemistry |
| Zdroj: | RSC Advances. 9:33345-33353 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c9ra07155e |
| Popis: | To improve the adsorption efficiency of tea-based biosorbents for removing fluoride in drinking water, the novel and effective adsorbent was formed by treating tea waste with extrusion technology. In this study, the extrusion technology was applied to the preparation of adsorbents for the first time. A low-priced and more efficient adsorbent was prepared by loading zirconium onto extruded tea waste (EXT-Zr). Extruded tea waste increased the surface pore size, which could provide more loading sites for zirconium. The EXT-Zr effectively removed fluoride from water in a pH range of 3.0–10.0, which is wider than the pH range of zirconium-loaded tea waste (Tea-Zr). The adsorption was fitted by a pseudo-second order kinetic model and the Langmuir adsorption model. The maximum adsorption capacity was 20.56 mg g−1. The EXT-Zr adsorbent was characterized by Scanning electron microscopy (SEM), Energy-Dispersive Spectroscopy (EDS), X-ray diffraction (XRD), a Brunauer–Emmett–Teller (BET) method, Fourier-transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) to prove the mechanism of how EXT-Zr adsorbs fluoride. The results proved that EXT-based adsorbent will be effective for the enhanced removal of fluoride in drinking water. |
| Databáze: | OpenAIRE |
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