• adsorption of norfloxacin in aqueous solution by mg–al layered double hydroxides with variable metal composition and interlayer anions

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 559
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     mg–al layered double hydroxides (mg–al-ldhs) were synthesized and used for adsorption on norfloxacin (nor) in aqueous solution. batch adsorption experiment was conducted to study the adsorption kinetics and isotherms of norfloxacin on mg–al-ldhs. adsorption of nor by mg–al-ldhs with variable mg2+/al3+ molar ratios (2:1, 3:1 and 4:1), with sn4+ incorporation and different interlayer anions (co2-3 and cl-) were investigated to explore the effect of metal composition and interlayer anions on the adsorbing performance of ldhs. ldhs with higher al3+ content and cl as interlayer anion exhibited better performance for nor adsorption both in adsorption rate and adsorption capacity. the incorporation of sn4+ resulted in the deterioration on the adsorption ability of mg–al-ldhs. the pseudo-second rate model correlated the adsorption kinetics data well. freundlich model fitted well with the adsorption equilibrium data. the negative value of δg° and δh° observed for mg–al–co3-ldhs and mg–al–cl-ldhs proved the spontaneity and exothermic nature of the adsorption process, while δs° value was negative for mg–al–cl-ldhs and positive for mg–al–co3-ldhs, which indicated an opposite trend in the entropy of the solid/liquid system. ph-dependent experiments showed both mg–al–co3-ldhs and mg–al–cl-ldhs had high ph buffering ability and the adsorption amount of nor insignificantly changed within a wide initial ph range (ph 3.0–11.0). the electrostatic attraction was suggested to control nor adsorption on mg–al–co3-ldhs, while the dominating anion exchange process along with electrostatic attraction contributed to the adsorption by mg–al–cl-ldhs.

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