A novel adsorbents, aluminum and iron - modified fly ash (AMA and IMA), were prepared by wet impregnation of fly ash with aluminum sulfate and ferric sulfate solutions for adsorption of Fluoride from aqueous solution. Adsorbents physicochemical properties were characterized by X-ray diffractometry, scanning electron microscopy and X-ray fluorescence spectrometry. Adsorption experiments were conducted to test the effects of pH, adsorbent dosage and contact time at room temperature on fluoride adsorption. Since the chemistry quality of groundwater varies from point to point, the effect electrolytes such as bicarbonate, chloride and sulfate on fluoride removal were studied too. The most conventional adsorption isotherms and kinetic models were applied to describe fluoride adsorption and reaction dynamic, respectively. The adsorption isotherm data could be well described by Langmuir isotherm model and the kinetic study was followed the pseudo-second-order model. The maximum adsorption capacities for AMA and IMA were 3.04 and 2.73 mg/g, respectively as calculated by Langmuir model. Among the aforementioned Adsorbents (i. e., AMA and IMA), AMA had more effective performance for removal of fluoride from aqueous solutions. The adsorption efficiency of fluoride onto both AMA and IMA was found to increase by contact time and adsorbent concentrations, and by decreasing of pH and adsorbate concentrations. The coexisting ions had a diverse impact on absorption rate of fluoride by AMA and IMA in order of comprehensive>bicarbonate>chloride>sulfate. This study represented that the removal of fluoride by aluminum and iron - modified fly ash is a low cost and promising technique.

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