کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8851415 | 1618770 | 2018 | 29 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Adsorption and transformation of the anthelmintic drug niclosamide by manganese oxide
ترجمه فارسی عنوان
جذب و تبدیل نیکلزامید داروهای ضد سرطان به اکسید منگنز
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کلمات کلیدی
نیکلاسامید، اکسید منگنز، ماده طبیعی آلی، جذب، اکسیداسیون،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
چکیده انگلیسی
The manganese oxide birnessite adsorbed and catalyzed the transformation of the anthelminthic drug niclosamide (NIS) into 2-chloro-4-nitroaniline (CNA) and 5-chlorosalicylic acid (CSA) at acidic pH. The adsorption of NIS was fitted using a linear isotherm for all conditions and reaction times. Linear adsorption constant Kd was 103â¯000â¯Lâ¯kgâ1 at pH 5.0. The rate of transformation was first order with respect to both MnO2 and NIS. At pH 5.0, the second order rate constant was 3.3 (±0.3)â¯Ãâ¯10â1â¯Mâ1â¯sâ1. The adsorption constants and the rates of transformation decreased when pH increased from 4.0 to 5.5 because of increasing electrostatic repulsions between both negatively charged manganese oxide surface (pHzpcâ¯=â¯2.5) and NIS (pKaâ¯=â¯6.38). The presence of natural organic matter (NOM) extracted from surface water also significantly decreased the adsorption and the rates of transformation of NIS. The rate of transformation decreased by a factor of 20 in presence of 1.6 mgC Lâ1 even though significant amounts of NIS were adsorbed onto MnO2. The interactions between NOM and NIS were investigated by using the fluorescence quenching method and would explain that NIS adsorbed on the surface of manganese oxide was stable in presence of NOM. Thus, hydrolysis catalyzed by manganese oxide is probably not an important process compared to biodegradation and adsorption because of the presence of organic matter and pH values usually >5.5 in aquatic environment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 201, June 2018, Pages 425-431
Journal: Chemosphere - Volume 201, June 2018, Pages 425-431
نویسندگان
Thai Ha Tran, Jérôme Labanowski, Hervé Gallard,