کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5468562 1519041 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inorganically modified clay minerals: Preparation, characterization, and arsenic adsorption in contaminated water and soil
ترجمه فارسی عنوان
مواد معدنی خالص اصلاح شده معدنی: آماده سازی، خصوصیات، جذب آرسنیک در آب و خاک آلوده
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی
The use of modified clay minerals for adsorbing arsenic (As) in contaminated soils is an underexplored area of research. The adsorption behavior of As onto inorganically modified smectite and kaolinite both in aqueous and soil media was studied. X-ray diffraction, infra-red spectroscopy, scanning and transmission electron microscopy studies confirmed successful modification of smectite through Fe-exchange and Ti-pillaring, and kaolinite through phosphate binding. The modified smectites were more efficient than phosphate-bound kaolinite in adsorbing As both in water and soil systems. Kinetic study revealed that the clay products reached adsorption equilibrium within 3 h, and the data well fitted to the power function and simple Elovich equation (R2 > 0.90). The Freundlich isotherm model best described the As adsorption data (R2 > 0.86) of the modified clay products in both the systems. The Ti-pillared smectite exhibited the highest As adsorption capacity (156.54 μg g− 1) in the aqueous medium, while the Fe-exchanged smectite was the best material in the soil system (115.63 μg g− 1). The partition coefficient (Kd) and adsorption efficiency (%) data also maintained the similar trend. Precipitation of As and binuclear complex formation also took place in the soil system which made the metalloid non-labile as the time passed. The inorganically modified clay products reported here hold a great potential to adsorb As in contaminated groundwater, drinking water as well as soil.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 147, October 2017, Pages 1-10
نویسندگان
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