两亲性海藻酸衍生物对纳米TiO_2颗粒在水溶液中聚集行为的影响  

Influence of Amphiphilic Alginate Derivate on the Aggregation Behavior of TiO_2 Nanoparticles in Aqueous Solution

作　　者：王瑞[1] 李嘉诚[1] 冯玉红[1] 黄俊浩[1] 伍剑博 向飞[1] 

机构地区：[1]海南大学材料与化工学院,海南海口570228

出　　处：《精细化工》2016年第2期132-136,212,共6页Fine Chemicals

基　　金：国家自然科学基金(21366010;21566009);海南省重点科技计划(ZDXM2014037;cxy20150026);海口市重点科技计划项目(2014055);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~~

摘　　要：利用十二烷基改性海藻酸钠（Na Alg-Dode）在Ti O2纳米颗粒表面上的吸附,得到了稳定的纳米Ti O2颗粒悬浮液。采用傅里叶变换红外光谱仪（FTIR）、动态光散射仪（DLS）及流变仪对颗粒粒径、表面电位及其悬浮体系的流变性进行了测定,研究了不同p H下Na Alg-Dode对纳米Ti O2颗粒在水溶液中聚集行为和流变性的影响。结果表明,加入Na Alg-Dode后,在p H=4-8内均有利于悬浮体系稳定,p H=6.3（等电点）处Ti O2颗粒的平均粒径由2.5μm降低至500 nm左右,颗粒表面Zeta电位由0降低至-40 m V左右。同时随着Na Alg-Dode的加入,Ti O2悬浮体系的剪切应力逐渐增大,表明颗粒间的相互作用增强。由此推知,Na Alg-Dode提高纳米Ti O2颗粒悬浮体系的稳定机制：Na Alg-Dode分子在不同p H下能够通过静电作用、氢键作用及疏水作用等吸附在Ti O2颗粒上,改变颗粒表面电性及空间位阻,从而降低颗粒的团聚。Stable dispersion system of Ti O2 nanoparticles was made by dodecyl sodium alginate（ Na AlgDode） adsorbing on the Ti O2 nanoparticles. The particles size,zeta potential and rheological properties of suspension system were measured by means of Fourier transform infrared spectrometer（ FTIR）,Dynamic light scattering（ DLS） and Rheometer. The influence of Na Alg-Dode on the aggregation behavior of Ti O2 nanoparticles in aqueous solution and rheological property were researched at various p H values. Experimental results showed that Na Alg-Dode was conducive to the stability of Ti O2 nanoparticles dispersion system within the scope of p H = 4 ~ 8. The average size of Ti O2 particles decreased to 500 nm from 2. 5 μm and the surface Zeta potential of particles reduced to- 40 m V from0 at p H = 6. 3. At the same time,the shear stress of Ti O2 nanoparticles dispersion system increased gradually with the addition of Na Alg-Dode,which suggested that the interaction between particles enhanced. Therefore,the mechanism that Na Alg-Dode improved the stability of Ti O2 nanoparticles dispersion system was inferred： Na Alg-Dode molecules were able to reduce the particles aggregation via changing the zeta potential and space steric of Ti O2 by electrostatic interactions,hydrogen bonding and hydrophobic function.

关 键 词：海藻酸盐衍生物 TiO2颗粒 吸附 分散 表面活性剂 

分 类 号：TQ423[化学工程]