苄基接枝海藻酸衍生物对TiO2纳米粒分散稳定性的影响

doi:10.13218/j.cnki.csdc.2018.06.008

日用化学工业 ›› 2018, Vol. 48 ›› Issue (6): 341-347.doi: 10.13218/j.cnki.csdc.2018.06.008

苄基接枝海藻酸衍生物对TiO₂纳米粒分散稳定性的影响

冯美西^1,2, 颜慧琼^1,2, 陈秀琼², 林良泉², 杨正², 林强^1,2

1.海南师范大学热带药用植物化学教育部重点实验室,海南海口 571158;
2.海南师范大学水环境污染治理与资源化海南省重点实验室,海南海口 571158

收稿日期:2017-12-30 发布日期:2019-03-18
通讯作者: 林强,教授,博士生导师,E-mail:linqianggroup@163.com。颜慧琼,副教授,博士,E-mail:yanhqedu@163.com。
作者简介:冯美西(1991-),女,广东湛江人,硕士研究生,电话:17889789712,E-mail:feng4528717@163.com。
基金资助:
海南省自然科学基金资助项目(218QN233);国家自然科学基金资助项目(21566009);海南省水环境污染治理与资源化重点实验室开放基金资助项目

Effects of benzyl-grafted alginate derivative on the dispersion stability of TiO₂ nanoparticles

FENG Mei-xi^1,2, YAN Hui-qiong^1,2, CHEN Xiu-qiong², LIN Liang-quan², YANG Zheng², LIN Qiang^1,2

1.Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education,Hainan Normal University,Haikou,Hainan 571158,China;
2.Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province,Hainan Normal University,Haikou,Hainan 571158,China

Received:2017-12-30 Published:2019-03-18

摘要/Abstract

摘要： 以溴化苄为疏水改性剂,采用双分子亲核取代反应(SN2)制得苄基接枝海藻酸衍生物(BAD)。通过动态光散射技术,考察了在不同pH和离子强度下BAD对TiO₂纳米粒水悬浮液分散稳定性的影响。并采用红外光谱和扫描电镜对BAD/TiO₂纳米粒复合物的官能团和表面形貌进行了测试。结果表明,通过SN2反应成功地合成了具有胶体性能的BAD。BAD胶束的平均水动力学粒径(d_H)大小为423.4 nm,Zeta电位值为-27.4 mV,表现出较好的胶体性能。在不同pH下,BAD的吸附可提高TiO₂纳米粒的带电性,使其Zeta电位均低于-30 mV,而且其d_H相比单一的TiO₂纳米粒显著减小。在不同离子强度下,BAD可明显削弱反离子对TiO₂纳米粒静电屏蔽作用的影响,使TiO₂纳米粒的团聚行为大大降低,d_H显著减小。BAD分子链不仅能够提高TiO₂颗粒间的静电斥力,而且还能提供有效的空间位阻,提高TiO₂纳米粒在不同pH和离子强度下的分散稳定性。红外和扫描电镜分析结果表明,BAD和TiO₂纳米粒主要通过氢键作用来实现BAD在TiO₂纳米颗粒上的吸附,从而提高TiO₂纳米颗粒间的空间位阻作用使其稳定分散。

关键词: 苄基接枝海藻酸衍生物, TiO₂纳米粒, 双分子亲核取代反应, 动态光散射, 分散稳定性

Abstract: Benzyl-grafted alginate derivative (BAD) was prepared by bimolecular nucleophilic substitution reaction (SN2) using benzyl bromide as a hydrophobic modifier.The effects of BAD on the dispersion stability of aqueous suspension of TiO₂ nanoparticles at different pH and ionic strength were investigated by dynamic light scattering.Additionally,the functional groups and morphology of BAD/TiO₂ nanoparticle composite were measured by fourier transform infrared spectroscopy and scanning electron microscopy.The experimental results show that the colloidal BAD is successfully synthesized by SN2 reaction.The average hydrodynamic size (d_H) of BAD micelles is 423.4 nm and the Zeta potential is-27.4 mV,which exhibits good colloidal properties.At different pH,the adsorption of BAD can enhance the chargeability of TiO₂ nanoparticles,which makes their Zeta potential to be lower than -30 mV and their d_H to be significantly lower than that of single TiO₂ nanoparticles.At different ionic strength,BAD can obviously weaken the electrostatic shielding effect of counterions on TiO₂ nanoparticles,which makes the agglomeration behavior of TiO₂ nanoparticles to be greatly reduced and their d_H to be significantly decreased.The molecular chain of BAD can not only enhance the electrostatic repulsion among TiO₂ particles,but also provide effective steric hindrance,which improves the dispersion stability of TiO₂ nanoparticles at different pH and ionic strength.The results of infrared spectroscopy and scanning electron microscopy indicate that the adsorption of BAD on TiO₂ nanoparticles is achieved mainly through the hydrogen bonding between BAD and TiO₂ nanoparticles,which has enhanced the steric hindrance among TiO₂ nanoparticles and thus makes them dispersed stably.

Key words: benzyl-grafted alginate derivative, TiO₂ nanoparticle, bimolecular nucleophilic substitution reaction, dynamic light scattering, dispersion stability

中图分类号:

O648.2+3

冯美西, 颜慧琼, 陈秀琼, 林良泉, 杨正, 林强. 苄基接枝海藻酸衍生物对TiO₂纳米粒分散稳定性的影响[J]. 日用化学工业, 2018, 48(6): 341-347.

FENG Mei-xi, YAN Hui-qiong, CHEN Xiu-qiong, LIN Liang-quan, YANG Zheng, LIN Qiang. Effects of benzyl-grafted alginate derivative on the dispersion stability of TiO₂ nanoparticles[J]. China Surfactant Detergent & Cosmetics, 2018, 48(6): 341-347.

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苄基接枝海藻酸衍生物对TiO₂纳米粒分散稳定性的影响

Effects of benzyl-grafted alginate derivative on the dispersion stability of TiO₂ nanoparticles

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