Adsorption of sodium polyacrylate at interface of dicalcium silicate-sodium aluminate solution

来源期刊:中国有色金属学报(英文版)2011年第10期

论文作者:于海燕 潘晓林 丁婷婷 张武 刘涵 毕诗文

文章页码:2323 - 2326

关键词:铝酸钠溶液;聚丙烯酸钠;硅酸二钙;界面;吸附

Key words:sodium aluminate solution; sodium polyacrylate; dicalcium silicate; interface; adsorption

摘    要:测定了80 ℃时2CaO·SiO2 (C2S)在铝酸钠溶液中吸附聚丙烯酸钠(AY)的吸附量等温线。结果表明:AY在C2S表面的吸附类型为饱和吸附,吸附行为属“L”型,符合Langmuir方程单分子层吸附模型。结合C2S的比表面积可求出AY饱和吸附时表面覆盖度为1.06 mol/μm2。同时,运用Gibbs公式处理C2S在固-液界面的吸附结果,研究吸附膜的表面压力和分子面积的关系曲线,并讨论因吸附引起的固-液界面能变化规律以及曲线与吸附类型的关系。

Abstract:

The adsorption isotherm of sodium polyacrylate on dicalcium silicate (2CaO·SiO2) in sodium aluminate solution at 80 ℃ was studied. The type of surface adsorption of sodium polyacrylate is saturated adsorption, and the adsorption behavior belongs to L-type, according with the monolayer adsorption model of Langmuir equation. The surface coverage of sodium polyacrylate is 1.06 mol/μm2. The relation curve between the surface pressure and the molecular area of adsorption film was obtained by Gibbs formula. The variation of interfacial energy caused by adsorption as well as the relationship between the relation curve and the type of adsorption was discussed.

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