کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1694043 1519059 2016 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Iron removal from kaolin using binuclear rare earth complex activated thiourea dioxide
ترجمه فارسی عنوان
حذف آهن از کائولن با استفاده از دی اکسید تیروئید فعال شده با مجموعه خاکی کمیاب دوهسته ای
کلمات کلیدی
فعال سازی؛ مجموعه خاکی کمیاب دوهسته ای ؛ حذف آهن؛ کائولن؛ دی اکسید تیوورا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی


• One kind of binuclear rare earth complex with high catalytic activity was prepared.
• Iron was effectively removed from kaolin using activated TD as the reductive agent.
• The whiteness of calcined kaolin was notably raised after bleaching treatment.

A binuclear rare earth complex was prepared by using Ce3 + and Y3 + as the central ion, and acetyl acetone (Hacac) as the ligand. Thiourea dioxide (TD) had strong reductive properties and good bleaching performance on kaolin after being activated by the complex. The concentrations of TD and the activator were fixed at 30 g/L and 0.6 g/L respectively, and the influences of raw material proportion, solution pH and reaction time on the activating efficiency of TD were investigated. The results show that TD reached its optimum activating efficiency after activation with the complex prepared under the conditions: the molar ratio of Ce3 +:Y3 +:Hacac = 1:1:7, solution pH = 7, and reaction time = 3 h. The highest reductive potential of TD could reach up to − 662 mV under the mild conditions (T = 25 °C, pH = 7.2). The influence of the dosage of activated TD on the bleaching effect of kaolin was characterized by colorimeter, XRD, SEM and EDS. The results show that the bleaching effect of kaolin reached the highest when the dosage of activated TD was 0.5 wt% (relative to the mass of kaolin). The calcined whiteness index of kaolin was raised from 82.6% to 88.7%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 126, June 2016, Pages 63–67
نویسندگان
, , , , ,