کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
608652 880605 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorptive removal of arsenic from water by an iron–zirconium binary oxide adsorbent
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Adsorptive removal of arsenic from water by an iron–zirconium binary oxide adsorbent
چکیده انگلیسی

Arsenate and arsenite may exist simultaneously in groundwater and have led to a greater risk to human health. In this study, an iron–zirconium (Fe–Zr) binary oxide adsorbent for both arsenate and arsenite removal was prepared by a coprecipitation method. The adsorbent was amorphous with a specific surface area of 339 m2/g. It was effective for both As(V) and As(III) removal; the maximum adsorption capacities were 46.1 and 120.0 mg/g at pH 7.0, respectively, much higher than for many reported adsorbents. Both As(V) and As(III) adsorption occurred rapidly and achieved equilibrium within 25 h, which were well fitted by the pseudo-second-order equation. Competitive anions hindered the sorption according to the sequence PO43->SiO32->CO32->SO42-. The ionic strength effect experiment, measurement of zeta potential, and FTIR study indicate that As(V) forms inner-sphere surface complexes, while As(III) forms both inner- and outer-sphere surface complexes at the water/Fe–Zr binary oxide interface. The high uptake capability and good stability of the Fe–Zr binary oxide make it a potentially attractive adsorbent for the removal of both As(V) and As(III) from water.

Arsenate is removed by Fe–Zr binary oxide through formation of inner-sphere surface complexes, while As(III) is removed by formation of both inner- and outer-sphere surface complexes.Figure optionsDownload high-quality image (76 K)Download as PowerPoint slideHighlights
► The Fe–Zr binary oxide has high adsorption capacity toward both As(V) and As(III).
► Co-existing anions did not significantly influence the arsenic adsorption.
► As(V) is adsorbed by formation of inner-sphere surface complexes.
► As(III) is adsorbed by formation of both inner- and outer-sphere surface complexes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 358, Issue 1, 1 June 2011, Pages 230–237
نویسندگان
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