کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4471525 1315031 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and performance of arsenate (V) adsorbents derived from concrete wastes
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Preparation and performance of arsenate (V) adsorbents derived from concrete wastes
چکیده انگلیسی


• Solid adsorbents were prepared from waste cement powder and concrete sludge.
• Arsenic removal performances of the prepared materials were assessed.
• The arsenic removal mechanism was considered to involve Ca3(AsO4)2 precipitation.
• The observed lowest arsenic concentration meets the previous WHO guideline value.

Solid adsorbent materials, prepared from waste cement powder and concrete sludge were assessed for removal of arsenic in the form of arsenic (As(V)) from water. All the materials exhibited arsenic removal capacity when added to distilled water containing 10–700 mg/L arsenic. The arsenic removal isotherms were expressed by the Langmuir type equations, and the highest removal capacity was observed for the adsorbent prepared from concrete sludge with heat treatment at 105 °C, the maximum removal capacity being 175 mg-As(V)/g. Based on changes in arsenic and calcium ion concentrations, and solution pH, the removal mechanism for arsenic was considered to involve the precipitation of calcium arsenate, Ca3(AsO4)2. The enhanced removal of arsenic for the adsorbent prepared from concrete sludge with heat treatment was thought to reflect ion exchange by ettringite. The prepared adsorbents, derived from waste cement and concrete using simple procedures, may offer a cost effective approach for arsenic removal and clean-up of contaminated waters, especially in developing countries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 34, Issue 10, October 2014, Pages 1829–1835
نویسندگان
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