Removal of fluoride from drinking water by natural stilbite zeolite modified with Fe(III)
| Autor: | Jiaqiang Xu, Xiaowei Cheng, Youbao Sun, Junping Dong, Qinghua Fang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Stilbite
Chemistry Mechanical Engineering General Chemical Engineering Inorganic chemistry Langmuir adsorption model General Chemistry engineering.material symbols.namesake chemistry.chemical_compound Crystallinity Adsorption X-ray photoelectron spectroscopy engineering medicine symbols Ferric General Materials Science Zeolite Fluoride Water Science and Technology medicine.drug |
| Zdroj: | Desalination. 277:121-127 |
| ISSN: | 0011-9164 |
| DOI: | 10.1016/j.desal.2011.04.013 |
| Popis: | Stilbite zeolite (STI), a natural zeolite with high crystallinity and an open pore system, was modified with FeCl 3 solution for the removal of fluoride from drinking water. The parent STI and modified STI (Fe(III)-STI) were characterized by FTIR, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Adsorption of fluoride on modified STI (Fe(III)-STI) was studied as a function of contact time, adsorbent dose, initial concentration, pH and coexisting ions. Fluoride concentration can be reduced down to the lower level of 1 mg L −1 under the optimum condition (with solid/solution ratio of 1:100 and the contact time of 2 h and pH 6.94) when initial fluoride concentration of 10 mg L −1 is employed. The fluoride adsorption on Fe(III)-STI zeolite is well described by the Langmuir adsorption model, and the maximum fluoride adsorption capacity is 2.31 mg g −1 . The kinetic result indicates that the adsorption of fluoride on the modified natural zeolite follows pseudo-first-order model. The possible mechanism on fluoride adsorption on Fe(III)-STI zeolite is also discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect