کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6309065 | 1618862 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development and characterization of colloidal silica-based slow-release permanganate gel (SRP-G): Laboratory investigations
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
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چکیده انگلیسی
The SRP-G exhibited a two-phase increase in viscosity: a lag phase characterized by little increase in viscosity followed by a short gelation phase. Gelation lag times of SRP-G solutions increased (from 0.5 h to 13 d) with decreasing KMnO4 concentrations (from 25 to 8 g Lâ1). Permanganate release from gelated SRP-G increased with increasing KMnO4 concentrations, and was characterized as asymptotic release with initial peak (0.9-2.2 mg minâ1) followed by more attenuated release. Gelation lag times of SRP-G flowing in sands (linear velocity = 2.1 m dâ1) increased (1, 3, and 6 h) with decreasing KMnO4 concentrations (25.0, 23.0, and 22.9 g Lâ1). Permanganate release from gelated SRP-Gs continued for up to 3 d and was characterized as asymptotic release with an initial peak release (â¼1.2 g minâ1) followed by more attenuated release over 70 h. Dilution of SRP-G by dispersion in porous media affects gelation and release kinetics. Increasing the silica concentration in the SRP-G may facilitate gelation and extend the duration of MnO4- release from emplaced SRP-G in porous media.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 109, August 2014, Pages 195-201
Journal: Chemosphere - Volume 109, August 2014, Pages 195-201
نویسندگان
Eung Seok Lee, Neha Gupta,