کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6578381 1422928 2018 41 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrokinetic removal of chromium from chromite ore-processing residue using graphite particle-supported nanoscale zero-valent iron as the three-dimensional electrode
ترجمه فارسی عنوان
حذف الکترو کینتیک از کروم از مانده پردازش سنگ معدن کرومیت با استفاده از آهنربا بدون ذره ای با اندازه ذرات گرافیت به عنوان الکترود سه بعدی
کلمات کلیدی
مانده پردازش سنگ معدن کرومیت، حذف الکترو کینتیک، آهن نانوساختار صفر ارزشمند، الکترود سه بعدی، ویژگی های سمی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
Chromite ore processing residue (COPR) contaminates farmland and groundwater around storage fields through the release of chromium leachate. Graphite particle-supported nanoscale zero-valent iron (GP-nZVI) synthesized by an impregnation-reduction pathway was used as a microelectrode in a three-dimensional electrochemical system to enhance the electrokinetic removal of Cr from COPR samples. The environmental activities of the electrokinetics-treated samples were measured by analysing the chemical speciation and conducting toxicological tests on Vibrio fischeri. The first-order and Elovich kinetic models are suitable for predicting the reaction process under different aqueous conditions. A strong acid environment and a high proportion of GP-nZVI in the electrolyser were conducive to achieving high removal efficiencies of Cr during the electrokinetic process. The improved reduction of Cr(VI) anions, the strengthened electromigration of Cr(III) cations, and the co-precipitation of Cr(III) and Fe(III) near the cathode were concluded to be the main advantages of a 3D electrode compared with a 2D system in increasing Cr electrokinetic removal from COPR. The detoxification of the COPR sample was found to be gradually reduced from the anode to cathode in the electrolyser. Electrokinetic treatment with GP-nZVI as the three-dimensional electrode can effectively decrease the toxicological effect of chromite ore-processing residue at an experimental scale.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 350, 15 October 2018, Pages 1022-1034
نویسندگان
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