Određivanje brzine i mehanizama adsorpcije fluorida iz vode aktivnim ugljenom pomoću ravnotežnih i kinetičkih modela
The water containing high fluoride ions could do harm to human and environment and the adsorption process is widely used method for the removal of fluoride. In this study, the applicability of four commercial activated carbons as adsorbents for the removal of excess fluoride from water was investigated. Activated carbons were also modified by liquid-phase oxidation using HNO3 and H2O2. Adsorption experiments were carried out at various initial fluoride concentration (2 – 40 mg/L), pH (4 – 9), time interval (15 – 360 minutes), adsorbent dose (2 – 20 g/L) and temperature (25 – 45ºC). The amount of fluoride adsorbed decreased with increasing initial fluoride concentration but increased with temperature increasing. The optimal pH for the adsorption was from 4 to 6. Adsorption isotherms have been modeled using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms and adsorption followed Freundlich isotherm model. From the results of various kinetic models, pseudo-second-order fit well with the fluoride adsorption kinetic conducted at different temperature. Study of temperature effect on fluoride adsorption confirmed the endothermic behavior of the process. As a result of this study, it was concluded that activated carbons and their oxidized forms are efficient adsorbent for the removal of fluoride. The ability of oxidized activated carbon to remove fluoride ions was greater than with non-oxidizing.
|Creator||Ergović Ravančić, Maja (Search Europeana for this person)|
|Collection||Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology.|
|Subject Terms||BIOTECHNICAL SCIENCES. Food Technology. Engineering., Engineering. Technology in general, fluoride, activated carbon, adsorption, water|
|Provider||National and University Library in Zagreb|