کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
612039 880690 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The interaction of EDTA with barium sulfate
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
The interaction of EDTA with barium sulfate
چکیده انگلیسی

Ethylenediaminetetraacetic acid (EDTA) is a known complexing agent that interacts with a host of cations. In this paper, various techniques are used to elucidate the mechanism of interaction between EDTA and barium sulfate surfaces. It is shown that complexation with metal ions is not sufficient to explain the inhibition of barite crystallization but that other processes such as chemisorption must also occur. EDTA is shown to always adsorb as the mono-protonated species—suggesting that the molecule is able to lose a proton when it adsorbs at lower pH. Molecular modelling shows that the interaction of the surface barium ions with the carboxylate group is an important one. Finally, in situ turbidity measurements provide information about the mechanism of nucleation/growth modification. It is found that the EDTA molecule inhibits barium sulfate nucleation and that this could be its primary means of inhibiting precipitation of barium sulfate.

Although the aminocarboxylate, ethylenediaminetetraacetic acid, is a known complexing agent, the mechanism by which it inhibits barium sulfate precipitation is better explained by adsorption onto critical nuclei.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 316, Issue 2, 15 December 2007, Pages 553–561
نویسندگان
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