کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9676084 | 1454114 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Kinetics and adsorption of benzoate and salicylate at the natural hematite-water interface
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Kinetics of adsorption of benzoate and salicylate onto the natural hematite surfaces have been carried out at pH 5 and at a fixed ionic strength (I = 1 Ã 10â4 mol dmâ3). The state of equilibrium was attained at 144 and 70 h for benzoate and salicylate, respectively. Adsorption behaviour of benzoate and salicylate onto the natural hematite was studied over a wide range of pH at a fixed I = 5 Ã 10â4 mol dmâ3 NaCl and at different temperatures. The adsorption isotherms for both the adsorbates were Langmuir type up to pH 8. The Îmax for benzoate is â2.7-13.7 times more than that of salicylate depending on the pH of the suspension. Unlike benzoate, salicylate is not only adsorbed at one surface site but also covers around three or more surface sites of hematite surface. The rate constant for adsorption, K1 for salicylate onto the natural hematite is greater than that of benzoate and increases with the increase in temperature and â4 times greater at a fixed temperature. The activation energy for the adsorption of salicylate onto the natural hematite is 2.9 times more than that of benzoate on the same adsorbent resulting in lower Îmax.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 254, Issues 1â3, 10 March 2005, Pages 49-55
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 254, Issues 1â3, 10 March 2005, Pages 49-55
نویسندگان
Manash R. Das, Dipak Bordoloi, Prakash C. Borthakur, Sekh Mahiuddin,