کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
613077 880714 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Proton interaction in phosphate adsorption onto goethite
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Proton interaction in phosphate adsorption onto goethite
چکیده انگلیسی

The adsorption of phosphate on goethite is generally modeled by assuming a simple ligand exchange reaction with surface hydroxyl groups. This study investigates the binding forms of phosphate on goethite by evaluating the proton interaction and surface charge change during phosphate adsorption. It is found that OH− release stoichiometry increases with phosphate coverage, which suggests that different mechanisms predominate at different phosphate loadings. It demonstrates that surface binding changes from monodentate complexation to bidentate complexation with increasing surface phosphate coverage. The net OH− release accompanying this transformation is best interpreted with a 2pKa2pKa multisite model.

Comparison of measured slope k value with theoretical surface charge change in multisite model.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 308, Issue 1, 1 April 2007, Pages 40–48
نویسندگان
, , , ,