کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6309806 | 1618876 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photo-induced oxidation of Sb(III) on goethite
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
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چکیده انگلیسی
Goethite widely exists in soils and sediments, and plays a very important role in the environmental fate of toxic metal(loid)s. In the present study, photo-induced oxidation of antimonite [Sb(III)] on goethite was investigated with kinetic measurements and X-ray photoelectron spectroscopy (XPS) techniques. Effects of environmental factors including solution pH, the content of goethite as well as humic acid on the photo-induced oxidation of antimonite were tested. The results indicated that no oxidation of antimonite occurred in goethite suspension in the dark, but significant amounts of antimonite were transformed to antimonate when the suspension was exposed to light. Ferrous ions were found in the solution during the antimonite oxidation process, and its concentration decreased with increasing solution pH, which strongly affected the oxidation rate of antimonite. The initial solution pH has great impact on Sb oxidation. After 2Â h illumination, the highest oxidation rate was found at pH 3, while the initial oxidation rate was even higher at pH 9. In conclusion, the antimonite can be adsorbed and oxidized on goethite irradiated with light, which will greatly reduce its environmental risk.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 95, January 2014, Pages 295-300
Journal: Chemosphere - Volume 95, January 2014, Pages 295-300
نویسندگان
Jian-Xin Fan, Yu-Jun Wang, Ting-Ting Fan, Xiao-Dan Cui, Dong-Mei Zhou,