在某些纳米颗粒存在下2-羟乙基纤维素的声催化降解
Sonocatalytic degradation of 2-hydroxyethyl cellulose in the presence of some nanoparticles.
作者信息
Taghizadeh Mohammad Taghi, Seifi-Aghjekohal Parinaz
机构信息
University of Tabriz, Faculty of Chemistry, Department of Physical Chemistry, Tabriz, Iran.
University of Tabriz, Faculty of Chemistry, Department of Physical Chemistry, Tabriz, Iran.
出版信息
Ultrason Sonochem. 2015 Sep;26:265-272. doi: 10.1016/j.ultsonch.2014.12.014. Epub 2015 Jan 2.
The degradation of 2-hydroxyethyl cellulose (HEC) by means of ultrasound irradiation and its combination with heterogeneous catalysts such as TiO2 (Rutile and Anatase), Montmorillonite Clay (MMT), ZnO and Fe3O4 nanoparticles was investigated. The effect of the type and quantity of nanoparticles, the initial molecular weight of polymer and the different ultrasonic power have been studied. Degradation behavior of HEC was studied through FTIR, XRD and SEM techniques and kinetics of degradation was studied by viscometry. Also, reduce in molecular weight (Mw) of polymer was investigated by gel permeation chromatography (GPC) analysis. The results of experiments suggested that the sonocatalytic degradation of HEC were remarkably higher than sonolytic degradation. However, the catalytic activity of nanoparticles in contrast to the ultrasonic irradiation was different. The experimental results revealed that the best HEC degradation can be obtained when the added Fe3O4 amount was 0.4 g/L. Furthermore, kinetic analysis of the polymer degradation process was carried out in this study.
研究了通过超声辐照及其与TiO2（金红石型和锐钛矿型）、蒙脱石粘土（MMT）、ZnO和Fe3O4纳米颗粒等非均相催化剂结合的方式对2-羟乙基纤维素（HEC）的降解。研究了纳米颗粒的类型和数量、聚合物的初始分子量以及不同超声功率的影响。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）技术研究了HEC的降解行为，并通过粘度测定法研究了降解动力学。此外，通过凝胶渗透色谱（GPC）分析研究了聚合物分子量（Mw）的降低。实验结果表明，HEC的声催化降解明显高于声解降解。然而，与超声辐照相比，纳米颗粒的催化活性有所不同。实验结果表明，当Fe3O4添加量为0.4 g/L时，HEC降解效果最佳。此外，本研究还对聚合物降解过程进行了动力学分析。
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