کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4484358 1316917 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Uptake of arsenite by synthetic layered double hydroxides
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Uptake of arsenite by synthetic layered double hydroxides
چکیده انگلیسی

Two types of layered double hydroxides (LDHs), hydrotalcite and hydrocalumite with different composition of layers and interlayers were investigated for the removal of arsenite from solutions. The kinetics study showed that anion exchange process was very fast and apparently attained a steady-state in the range of 8–16 h. Arsenite removal was found to be 87.5% and 83.6% with the nitrate forms of hydrotalcite and hydrocalumite, respectively. Layered double hydroxides synthesized at room temperature showed higher uptake than those synthesized by hydrothermal method due to small crystal size (high surface area) of the former. As expected, calcined hydrotalcite showed higher uptake than uncalcined carbonate form of hydrotalcite. The uptake process was anion exchange in hydrotalcite-type LDH as confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) but possibly some dissolution–reprecipitation occurred with hydrocalumite-type LDH.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 43, Issue 15, August 2009, Pages 3884–3890
نویسندگان
, , ,