کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
690749 1460424 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Defluoridation of aqueous solution using alkali-steam treated water hyacinth and elephant grass
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Defluoridation of aqueous solution using alkali-steam treated water hyacinth and elephant grass
چکیده انگلیسی
Inexpensive and abundantly available water hyacinth petioles and elephant grass leaves, ground into powder form after alkali-steam treatment, have been studied for their fluoride removal potential. About 85% of fluoride present within 5 mg/l NaF-spiked distilled water could be removed using only 1.0 g of treated water hyacinth and 1.5 g of similarly treated elephant grass. Compared to activated alumina, a commonly used defluoridation agent that removes about 2 mg of fluoride per gram of adsorbent, treated water hyacinth (that removed about 5 mg of fluoride per gram of adsorbent) and elephant grass (that removed about 7 mg of fluoride per gram of adsorbent) exhibited greater fluoride removal efficiencies. Fluoride removal efficiency was found to decrease with increasing pH and anion concentrations of fluoride solution and increase with duration of exposure. Chemical characterization of these biosorbents before and after exposure to fluoridated water indicated that the fluoride removal process is attributable to chemical adsorption driven primarily by C─F bond formation and hydrogen bonding between fluoride ions and protonated surface groups of the biomasses. The process also appears to be advantageous because it is inexpensive, does not produce sludge, or increase water hardness, or release hazardous leachates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 50, May 2015, Pages 215-222
نویسندگان
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