کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4486284 1316982 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reductive immobilization of chromate in water and soil using stabilized iron nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Reductive immobilization of chromate in water and soil using stabilized iron nanoparticles
چکیده انگلیسی

Laboratory batch and column experiments were conducted to investigate the feasibility of using a new class of stabilized zero-valent iron (ZVI) nanoparticles for in situ reductive immobilization of Cr(VI) in water and in a sandy loam soil. Batch kinetic tests indicated that 0.08 g/L of the ZVI nanoparticles were able to rapidly reduce 34 mg/L of Cr(VI) in water at an initial pseudo first-order rate constant of 0.08 h−1. The extent of Cr(VI) reduction was increased from 24% to 90% as the ZVI dosage was increased from 0.04 to 0.12 g/L. The leachability of Cr preloaded in a Cr-loaded sandy soil was reduced by nearly 50% when the soil was amended with 0.08 g/L of the ZVI nanoparticles in batch tests at a soil-to-solution ratio of 1 g: 10 mL. Column experiments indicated that the stabilized ZVI nanoparticles are highly deliverable in the soil column. When the soil column was treated with 5.7 bed volumes of 0.06 g/L of the nanoparticles at pH 5.60, only 4.9% of the total Cr was eluted compared to 12% for untreated soil under otherwise identical conditions. The ZVI treatment reduced the TCLP leachability of Cr in the soil by 90%, and the California WET (Waste Extraction Test) leachability by 76%. The stabilized ZVI nanoparticles may serve as a highly soil-dispersible and effective agent for in situ reductive immobilization of chromium in soils, groundwater, or industrial wastes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 41, Issue 10, May 2007, Pages 2101–2108
نویسندگان
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