Hydrophobic agglomeration of colloidal kaolinite in aqueous suspensions with dodecylamine

被引：52

作者：

Hu, Yang ^{[1
]}

Liu, Lingyun ^{[2
]}

Min, Fanfei ^{[2
]}

Zhang, Mingxu ^{[2
]}

Song, Shaoxian ^{[1
,3
]}

机构：

[1] Wuhan Univ Technol, Coll Resource & Environm Engn, Wuhan 430070, Hubei, Peoples R China

[2] Anhui Univ Sci & Technol, Sch Mat Sci & Engn, Huainan 232001, Anhui, Peoples R China

[3] Univ Autonoma San Luis Potosi, Inst Met, San Luis Potosi 78210, Mexico

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2013年 / 434卷

关键词：

Kaolinite; Hydrophobic agglomeration; Dodecylamine adsorption; Zeta potential; SURFACE-CHARGE; ADSORPTION; SODIUM; FLOCCULATION; FLOTATION;

D O I：

10.1016/j.colsurfa.2013.05.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The stability of colloidal kaolinite dispersions in the presence of dodecylamine (DDA) has been studied in this work through the measurements of aggregation degree, zeta potential and adsorption. The experimental results show that DDA can induce a strong aggregation of colloidal kaolinite in aqueous suspensions even though the particles are highly negatively charged. This aggregation closely correlated to the adsorption of DDA cation on kaolinite surfaces and the hydrophobicity, so that it should belong to hydrophobic agglomeration. The adsorption isotherm of DDA on kaolinite surfaces showed two regions in which the adsorption density sharply increased, which might correspond to the hemi-micelle and bilayer adsorption of DDA cation on the surfaces. In addition, the hydrophobic agglomeration could be weakened by the addition of NaCl, which was due to the decrease of DDA adsorption on kaolinite surfaces. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：281 / 286

页数：6

共 22 条

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[Anonymous], 1948, Theory of the Stability of Lyophobic Colloids

[2]

Precipitation of dodecyl amine in KCl-NaCl saturated brine and attachment of amine particles to KCl and NaCl surfaces [J].