کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4426512 1309128 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption of fulvic acid by carbon nanotubes from water
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Adsorption of fulvic acid by carbon nanotubes from water
چکیده انگلیسی

This study investigated adsorption of fulvic acid (FA) by single-walled (SWCNT) and multi-walled carbon nanotubes (MWCNT) and activated carbon. Adsorption of FA depends greatly on the adsorbent surface area and solution pH. SWCNT has higher adsorption than MWCNT and activated carbon. Lower E4/E6 (absorbance at 465 nm to that at 665 nm) and higher E2/E3 (absorbance at 250 nm to that at 365 nm) ratios of the residual FA in solution after adsorption than that of original FA in low pH ranges suggest that aromatic rich FA fractions with polar moieties readily adsorb on the adsorbents. The apparent interaction mechanisms between FA and CNT surfaces include electrostatic, hydrophobic, π–π and hydrogen-bond interactions. FA adsorption was reduced greatly with increasing pH because of the increase of electrostatic repulsion and the decrease of hydrophobic and hydrogen-bond interactions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 157, Issue 4, April 2009, Pages 1095–1100
نویسندگان
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