کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
221668 464263 2016 10 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Chromium(VI) reduction in aqueous medium by means of catalytic membrane reactors
ترجمه فارسی عنوان
کاهش کروم (VI) در محیط آبی با استفاده از راکتورهای غشایی کاتالیزوری
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تولید محتوا
با 10 درصد تخفیف ویژه دانشیاری
کلمات کلیدی
راکتورهای غشایی کاتالیستی؛ کاهش کروم؛ فازهای فعال Pd و Pd / CeO2 / Fe2O3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Catalytic membrane reactors (CMRs) with Pd and Pd/CeO2/Fe2O3 active phases.
• Reduction of Cr(VI) to Cr(III) with hydrogen by means of CMRs.
• Chromate reduction in synthetic and real mineral waters.
• Complete elimination of chromium after pH adjustment and filtration.
• Steadily performance of the CMRs in the chromate reduction.

A novel method for catalytic reduction of chromium(VI) to chromium(III) in model and real water is proposed in this work. Hydrogen was used as a reducer. Three different catalytic membrane reactors were prepared and employed in the studied reaction. The catalytic membrane reactors were prepared using commercial corundum hollow fiber membranes. The active phases, palladium, cerium oxide, iron oxide or combinations of them, were incorporated by incipient wetness impregnation of the corresponding water-soluble salts followed by calcination and reduction. The catalytic tests were performed in semi-batch mode at ambient conditions. A mass flow controller was used to supply hydrogen to one end of the membrane whilst the other end was kept closed. The reactors were submerged into a vessel containing the chromate solution. The concentration of the chromate was continuously monitored following a standard analytical method. The initial chromate concentration was varied between 0.5 and 18 mg L−1. In order to completely reduce the Cr(VI) to Cr(III), it was necessary to decrease the pH of the solution to 3. In the end of the tests the final solutions were neutralized to pH 8 and filtered. The content of chromium in the final solutions and in the precipitates was determined by inductively coupled plasma (ICP) technique. It was demonstrated that for the studied reaction the presence of palladium is essential. In all experiments, with synthetic and real water adjusted to pH 3, the catalytic membrane reactors containing palladium (0.3–0.9 w/w%) effectively reduced the chromium to levels below 0.03 mg L−1 without losing activity in repetitive runs. The results from ICP analyses demonstrated that the chromium can be completely eliminated from the water after neutralization and filtration.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Chemical Engineering - Volume 4, Issue 2, June 2016, Pages 1880–1889
نویسندگان
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