کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
575882 1453068 2015 10 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of sodium silicate-derived gels as encapsulants for hazardous materials - The case of scorodite
ترجمه فارسی عنوان
بررسی ژل های مشتق شده از سیلیکات سدیم به عنوان کپسول کننده های مواد خطرناک - مورد اسکوراندیت
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
چکیده انگلیسی
High content arsenic waste generated in the metallurgical industry can be converted into a synthetic mineral, scorodite, FeAsO4·2H2O, and deposited into a landfill site. Scorodite is most stable in weakly acidic to neutral pH range under oxic conditions. A novel way to enhance the range of stability for scorodite is to encapsulate it with an inert material. In this work, silicate gel is developed and investigated as a possible encapsulating material for scorodite. The initial method of gel formation in this study produced a silicate gel with high alkalinity (pH 10) that was incompatible with scorodite. A reverse titration method was developed producing a gel with optimum pH profile (5-6.5). This technique proved to have only marginal effect on scorodite stabilization prompting an investigation of different ageing techniques (drying; 22, 44 °C and hydrothermal treatment; 110, 160 °C) as a means of producing silica-like coatings with better stabilization potential. Interestingly most of these measures proved counterproductive as aged scorogels showed a higher release of As than scorodite alone. Through surface-sensitive depth profile analysis (XPS), and molecular-sensitive analysis (Raman and FTIR mapping), it was discovered that the silicate engaged into an “ion-exchange” type reaction on the surface of scorodite by bonding to iron, hence the observed release of arsenic. Development of a hydrothermally-induced iron silicate layer may lead to an effective encapsulant.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 292, 15 July 2015, Pages 108-117
نویسندگان
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