Abstract

Oily wastewater causes a lot of environment problems and draws wide attention. In this paper, titanium modified multi-walled carbon nanotubes (CNTs/TiO₂) for the treatment of oily wastewater were synthesized using in situ sol-gel methods. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) were employed to characterize the structure and composition of CNTs/TiO₂. Also, scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that TiO₂ was evenly distributed in carbon nanotubes (CNTs) to induce a good synergistic effect. After the oily wastewater was treated with 400 mg/L of CNTs/TiO₂ at room temperature for 30 min, the light transmittance of the aqueous phase was 89.7%. Furthermore, the composites with good interfacial activity could be reused at least five times. The combination of dynamic interfacial tension measurements, interfacial activity, interfacial film assemble and optical microscope was employed to investigate the demulsification mechanism.

摘要

含油废水造成诸多环境问题，受到广泛关注。在本文中，使用原位溶胶-凝胶法合成了用于处理含油废水的钛改性多壁碳纳米管（CNTs/TiO ₂）。傅里叶变换红外光谱（FT-IR）和X射线衍射（XRD）被用来表征CNTs/TiO ₂的结构和组成。此外，扫描电子显微镜（SEM）和透射电子显微镜（TEM）表明，TiO ₂均匀分布在碳纳米管（CNT）中，具有良好的协同效应。含油废水经400 mg/L CNTs/TiO _{2 处理后}在室温下30分钟，水相的透光率为89.7%。此外，具有良好界面活性的复合材料至少可以重复使用五次。采用动态界面张力测量、界面活性、界面膜组装和光学显微镜相结合来研究破乳机制。