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۱Optimum Conditions for Adsorption of Lindane by Activated Carbon Derived from Date Stones
اطلاعات انتشار: World Applied Sciences Journal، بيست و هفتم،شماره۲، ۲۰۱۳، سال
تعداد صفحات: ۱۱
Trend of using economic products from agriculture waste in removing organic pollutants from water became highly accepted. So,the current study discussed theoptimum experimental conditions to utilize activated carbon, produced from agriculture by–product, to adsorb and remove lindane from aqueous solutions. Date stones were used for preparation of activated carbon using chemical activation by impregnation with concentrated H3PO4 (85%) at a ratio of 1:3 (w\w date stones: H3PO4) followed by pyrolysis at 500°C for 2h (AC1). Norit activated carbon was used as a reference carbon (AC2). A matrix effect analysis was applied to correlate the lindane adsorption capacity to the agitation time, initial concentrations of lindane (1 10mg\L), carbon dose (50–100 mg\100 ml), pH (3–11) and different temperatures (15–40°C). Physicochemical properties were investigated by several procedures; elemental analysis, SEM and porosity characteristics. The maximum removal percentages of lindane at equilibrium time were 98.6% for AC1 (within 3hrs) and 94% for AC2 (within 4hrs). The decrease in pH from 11 to 3 leads to an increase in the lindane retention onto both ACs, whereas temperature had slightly effect on the adsorption capacity. It can be concluded that date stones activated with H3PO4 is effective in the removal of lindane from aqueous media under different conditions. The experimental isotherm data were analyzed using Langmuir, Freundlich and Harkins–Jura isotherm equations. The error analysis demonstrated that the Langmuir equation was found to best represent the equilibrium data.
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