کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5765905 | 1627014 | 2017 | 29 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of hexavalent chromium sorption in serpentine sediments
ترجمه فارسی عنوان
بررسی جذب کروم شش ظرفیتی در رسوبات سرپانتین
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
PZCSSABrunauer–Emmett–Teller - Brunauer-Emmett-TellerReduction - اکسایشAdsorption - جذبWorld Health Organization - سازمان بهداشت جهانیSpecific surface area - سطح خاصBET - شرطXRF - طیف نگاری فلوئورسانس اشعه ایکسX-ray fluorescence - فلورسانس اشعه ایکسSEM - مدل معادلات ساختاری / میکروسکوپ الکترونی روبشیScanning electron microscopy - میکروسکوپ الکترونی روبشیpoint of zero charge - نقطه صفر شارژX-ray diffraction - پراش اشعه ایکسXRD - پراش اشعه ایکسHexavalent chromium - کروم شش ظرفیتیWHO - که
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
In this study the removal of hexavalent chromium (Cr6 +) by serpentine sediments was investigated in order to delineate Cr6 + sorption behavior in aquifers with ultramafic geologic background. Batch experiments were conducted in order to determine the influence of several parameters on Cr6 + removal, including the pH of the sediment solution, mineralogy, sediment's particle size and Cr6 + initial concentration. The results showed that Cr6 + removal was due to both adsorption and reduction phenomena. Reduction was attributed to the presence of a magnetic fraction in the sediment, mostly related to magnetite, which contributed almost 50% of the total removal in the pH range 3-7. Adsorption behavior was dominated by the finer sediment fraction (d < 0.075 mm). The amount of Cr6 + adsorbed was constant in the pH range 3-7, while it decreased sharply in the range 7-8.5. Cr6 + adsorption was found to increase and decrease proportionally with increasing initial Cr6 + concentration of and particle size, respectively. The linear Langmuir and Freundlich adsorption isotherms were used to describe the experimental data, with Freundlich providing a better fit to determine distribution factors for transport modeling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Contaminant Hydrology - Volume 197, February 2017, Pages 29-38
Journal: Journal of Contaminant Hydrology - Volume 197, February 2017, Pages 29-38
نویسندگان
Thanasis Mpouras, Maria Chrysochoou, Dimitris Dermatas,