کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
585728 1453187 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetics of hexavalent chromium reduction by scrap iron
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Kinetics of hexavalent chromium reduction by scrap iron
چکیده انگلیسی

The kinetics of Cr(VI) reduction by scrap iron was investigated in batch system, for aqueous solutions having low buffering capacities, as a function of pH (2.10–7.10), temperature (10–40 °C) and Cr(VI) concentration (19.2–576.9 μM). The results obtained using only the experimental data at initial times indicate zero-order kinetics at pH 2.10 and first-order kinetics over the pH range of 2.98–7.10. The reaction order with respect to H+ concentration, over the pH range of 4.17–7.10 and Cr(VI) concentration range of 19.2–38.4 μM, was found to be 0.31. The effects of pH, Cr(VI) initial concentration and temperature were investigated; the observed Cr(VI) reduction rates increased with decreasing pH, increasing temperature and decreasing initial Cr(VI) concentration. The observed and overall rate coefficients were determined, and a kinetic expression was developed to describe reduction of chromium by scrap iron over the pH range of 4.17–7.10 and Cr(VI) concentration range of 19.2–38.4 μM.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 135, Issues 1–3, 31 July 2006, Pages 66–73
نویسندگان
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