Abstract

Polyaniline (PANI) layer was successfully coated onto titanium dioxide nanoparticles (TiO₂ NPs) through polymerization of aniline under UV light irradiation. Thickness of the PANI layer was controlled by adjusting the aniline amount added in the reaction system. Morphologies of the PANI coated TiO₂ nanocomposite (PANI@TiO₂) were obtained using transmission electron microscope (TEM). The optical properties of the composite nanoparticles were characterized by UV-vis adsorption spectroscopy. Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were also used to analyze the prepared nanocomposites. The PANI@TiO₂ with a thin layer of PANI showed enhanced photocatalytic activity under simulated sunlight. The nanocomposites were coated onto mercerized cotton fabrics to endow the fabrics strong self-cleaning ability under sunlight. Furthermore, the PANI layer renders positive charges to TiO₂ NPs and the mercerization treatment of cotton increases the amount of the hydroxyl groups on the surface, Both of these two factors promote the successful coating of TiO₂ NPs on cotton. These results provide new insight for design of interface interaction between particles and fiber surface. Significantly, the convenient UV induced preparation method of PANI@TiO₂ could achieve an easy scale-up manufacture of photocatalytic materials for functionalization of textiles.

摘要

通过在紫外光照射下聚合苯胺，聚苯胺 (PANI) 层成功地涂覆到二氧化钛纳米粒子 (TiO ₂ NPs) 上。PANI层的厚度通过调节加入反应体系中的苯胺量来控制。使用透射电子显微镜 (TEM) 获得PANI 涂覆的 TiO ₂纳米复合材料 (PANI@TiO ₂ ) 的形貌。复合纳米粒子的光学性质通过紫外-可见吸收光谱表征。还使用傅里叶变换红外光谱 (FTIR)、X 射线粉末衍射 (XRD) 和 X 射线光电子能谱 (XPS) 分析制备的纳米复合材料。PANI@TiO ₂带有薄薄的 PANI 层在模拟阳光下表现出增强的光催化活性。将纳米复合材料涂覆在丝光棉织物上，使织物在阳光下具有很强的自洁能力。此外，PANI层使TiO ₂ NPs带正电荷，棉花的丝光处理增加了表面羟基的数量，这两个因素都促进了TiO ₂ NPs在棉花上的成功包覆。这些结果为设计粒子与纤维表面之间的界面相互作用提供了新的见解。值得注意的是，PANI@TiO ₂的方便的紫外诱导制备方法可以轻松地放大生产用于纺织品功能化的光催化材料。