کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
76903 49152 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Competitive adsorption of phenols on organically modified layered hexaniobate K4Nb6O17
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Competitive adsorption of phenols on organically modified layered hexaniobate K4Nb6O17
چکیده انگلیسی

Layered hexaniobate K4Nb6O17 was intercalated with two cationic surfactants, dodecylammonium (C12N) and dioctadecyldimethylammonium (2C182MeN) ions, and the obtained intercalation compounds were utilized as adsorbents for phenols dissolved in water. Competitive adsorption of phenol, 2-chlorophenol (2-CP) and 2,4-dichlorophenol (2,4-DCP), in binary- and ternary-solute systems was investigated. Both the adsorbents showed high adsorption selectivity for 2,4-DCP. The uptake of each solute was reduced by the presence of the other species, and the reduction in the multi-solute systems depended on the hydrophobicity of the adsorbates coexisted in the solution. For the adsorbent modified with 2C182MeN, however, uptakes of the solutes were enhanced by the presence of each other at low equilibrium concentrations in comparison with the single-solute solutions, because of cooperative adsorption. Adsorption isotherms of phenols in single-solute systems plotted against the equilibrium concentrations normalized with the solubility in water suggested that solute portioning was the main adsorption mechanism. Freundlich adsorption model succeeded in fitting the adsorption isotherms of phenols on the niobate modified with C12N cations in single-solute systems, and prediction of the competitive adsorption behavior of phenols with the Freundlich-based Sheindorf–Rebuhn–Sheintuch (SRS) model gave acceptable results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 96, Issues 1–3, 26 November 2006, Pages 84–92
نویسندگان
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