کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
611878 880687 2008 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Protonation of different goethite surfaces—Unified models for NaNO3 and NaCl media
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Protonation of different goethite surfaces—Unified models for NaNO3 and NaCl media
چکیده انگلیسی

Acid–base titration data for two goethites samples in sodium nitrate and sodium chloride media are discussed. The data are modeled based on various surface complexation models in the framework of the multi site complexation (MUSIC) model. Various assumptions with respect to the goethite morphology are considered in determining the site density of the surface functional groups. The results from the various model applications are not statistically significant in terms of goodness of fit. More importantly, various published assumptions with respect to the goethite morphology (i.e., the contributions of different crystal planes and their repercussions on the “overall” site densities of the various surface functional groups) do not significantly affect the final model parameters within simple 1-pK approximations. The simultaneous fit of the chloride and nitrate data results in electrolyte binding constants, which are applicable over a wide range of electrolyte concentrations including mixtures of chloride and nitrate. Model parameters for the goethite sample with 90 m2/g specific surface area are in excellent agreement with parameters that were independently obtained by another group on different goethite titration data sets.

Surface charge of goethite sample G-I in sodium chloride and nitrate data, modelled by a simple surface complexation approach.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 317, Issue 1, 1 January 2008, Pages 155–165
نویسندگان
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