Adsorption characteristics of sodium lignosulfonate on TiO2/water interface

doi:10.3969/j.issn.0438-1157.2013.04.031

CIESC Journal ›› 2013, Vol. 64 ›› Issue (4): 1351-1358.DOI: 10.3969/j.issn.0438-1157.2013.04.031

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Adsorption characteristics of sodium lignosulfonate on TiO₂/water interface

YANG Dongjie¹, WU Xiaolei¹, BAI Mengxian¹, YAN Mingfang², QIU Xueqing¹

1. State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;
2. School of Pharmaceutical and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, Guangdong, China

Received:2012-07-19 Revised:2012-08-27 Online:2013-04-05 Published:2013-04-05
Supported by:
supported by the National Natural Science Funds for Distinguished Young Scholar of China(20925622) and the National Natural Science Foundation of China(21176096).

木质素磺酸钠在TiO₂/水界面的吸附特性

杨东杰¹, 伍晓蕾¹, 白孟仙¹, 严明芳², 邱学青¹

1. 华南理工大学制浆造纸工程国家重点实验室,化学与化工学院,广东广州 510640;
2. 广东药学院医药化工学院,广东广州 510006

通讯作者: 邱学青
作者简介:杨东杰(1966—),女,博士,教授。
基金资助:
国家自然科学杰出青年基金项目(20925622);国家自然科学基金项目(21176096)。

Abstract

Abstract: The performance of sodium lignosulfonate (SL) in industrial applications is strongly related to its adsorption characteristics on surface of solid particles.To study its adsorption mechanisms on TiO₂/water interface, the effect of temperature, pH value, ionic strength and urea on its adsorption equilibrium and kinetics were systematically investigated using residual mass fraction method.The results show that the mechanism of SL adsorption on TiO₂/water interface is surface adsorption with mono-molecular layer. Its adsorption rate constant and saturation adsorption capacity increase with rising temperature or lowering pH value, in contrast, the increase of ionic strength and adding urea reduce adsorption rate constant.The main driving force for SL adsorption on TiO₂/water interface is considered as synergistic effect of electrostatic and hydrophobic interactions as well as hydrogen bonding, and the hydrophobic interaction can significantly improve its adsorption performance.

Key words: sodium lignosulphonate, adsorption mechanism, TiO₂

摘要： 木质素磺酸钠在固体表面的吸附特性决定了其应用性能,利用红外和紫外分光光度仪,采用剩余质量分数法研究了温度、pH值、无机盐和氢键破坏剂脲对木质素磺酸钠在TiO₂/水界面吸附动力学和等温吸附性能的影响,初步探讨了其在固液界面的吸附作用机理。结果表明,该吸附为单层多点式吸附,随着温度升高和pH值减小,木质素磺酸钠在TiO₂/水界面的吸附速率常数和饱和吸附量均增大,而离子强度的增大和脲的加入却使吸附速率常数减小;木质素磺酸钠在TiO₂/水界面的吸附驱动力为静电、疏水和氢键作用,疏水作用力可显著增加其吸附量。

关键词: 木素磺酸钠, 吸附机理, TiO₂

CLC Number:

YANG Dongjie, WU Xiaolei, BAI Mengxian, YAN Mingfang, QIU Xueqing. Adsorption characteristics of sodium lignosulfonate on TiO₂/water interface[J]. CIESC Journal, 2013, 64(4): 1351-1358.

杨东杰, 伍晓蕾, 白孟仙, 严明芳, 邱学青. 木质素磺酸钠在TiO₂/水界面的吸附特性[J]. 化工学报, 2013, 64(4): 1351-1358.

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Adsorption characteristics of sodium lignosulfonate on TiO₂/water interface

木质素磺酸钠在TiO₂/水界面的吸附特性

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