The Effect of Nitrate as a Radical Scavenger for the Removal of Humic Acid from Aqueous Solutions by Electron Beam Irradiation
- سال انتشار: 1391
- محل انتشار: فصلنامه تخصصی تحقیقات سلامت، دوره: 1، شماره: 3
- کد COI اختصاصی: JR_JCHR-1-3_003
- زبان مقاله: انگلیسی
- تعداد مشاهده: 289
نویسندگان
چکیده
Introduction: Humic acids have adverse effects on the water quality, then should be removed from water resources. The aim of this study was to evaluate the effect of nitrate as a radical scavenger for removal of humic acid from aqueous solutions by electron beam irradiation. Materials and Methods: In this study, after preparation of stock humic acid solution in alkaline condition, different concentrations of humic acid (۱۰, ۲۵ and ۵۰ mg/l) were prepared. Different concentrations of nitrate (۲۵, ۵۰ and ۱۰۰ mg/l) added to humic acid samples and then absorption of samples was measured at ۲۵۴ nm by using UV-Vis spectrophotometer before and after the electron beam irradiation. This study has done at pH= ۸ and at different electron beam adsorbed dose of ۱, ۳, ۶, ۹ and ۱۵ kGy. Results: The results of this study showed that the increasing of adsorbed dose from ۱ to ۱۵ kGy, the removal efficiency of humic acid also increased. By increasing of nitrate concentration from ۲۵ to ۱۰۰ mg/l, the removal efficiency of humic acid has decreased from ۴۳.۸% to ۳۶.۶% and nitrate acts as a radical scavenger. By increasing of humic acid concentration from ۱۰ to ۵۰mg/l, removal efficiency decreased in all adsorbed doses. Kinetic analysis of our results showed that the results well fitted with the second - order reaction. Conclusion: We can conclude from this study that electron beam irradiation could be a useful process for the treatment of natural organic matter (humic acid) from surface waters.کلیدواژه ها
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