聚苯胺包覆二氧化钛纳米线的制备及光降解罗丹明B

Preparation of polyaniline@TiO2 nanowires and its photodegradation of Rhodamine B

采用熔盐法制备TiO2纳米线,在十二烷基硫酸钠的作用下通过原位聚合法将苯胺聚合在TiO2纳米线表面,制备得到聚苯胺包覆二氧化钛(PAN@TiO2)纳米线.利用X射线衍射仪(XRD)、红外光谱仪(FTIR)、紫外-可见分光光度计(UV-vis)和透射电镜(TEM)等对TiO2纳米线和PAN@TiO2复合纳米线的组成、结构、吸光范围和形貌进行表征.结果表明:此复合纳米线是由金红石型TiO2纳米线为核、PAN为壳的核壳结构.以PAN@TiO2纳米线为光催化剂对罗丹明B进行光降解研究,光照8 h后罗丹明B的残留量小于1%(初始浓度为10 mg/L).PAN@TiO2复合纳米线的光降解能力明显高于纯金红石型TiO2,说明聚苯胺与TiO2的协同作用有利于光催化效率的提高.

TiO2 nanowires were prepared by molten salt growth method.In the presence of sodium dodecylsulfate(SDS),in situ polymerization of aniline on the surface of TiO2 nanowires gave uniform polymer shells for polyaniline@TiO2 nanowires.The composition,structure,absorbance range and morphology of the TiO2 and polyaniline@TiO2 composite electrode materials were investigated by X-ray diffraction(XRD),fourier transforminfrared spectroscopy(FTIR),ultraviolet-visible spectrophotometer(UV-vis)and transmission electron microscope(TEM).Results revealed that the composite nanowires had core-shell structures with rutile TiO2 nanowires as cores and polyaniline as shells.The photocatalytic degradation of rhodamine B(RhB)with polyaniline@TiO2 nanowires as photocatalyst showed that the residue of RhB was less than 1%after irradiation of 8 h(initial concentration was about 10 mg/L).The degradation ability of PAN@TiO2 was significantly higher than that of pure rutile TiO2.The synergistic effect of polyaniline and TiO2 was beneficial to the enhancement of photocatalytic efficiency.