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采用晶种原位形成与水热合成法,在SiO2大孔材料中原位生长出氧化锌纳米线(ZnO NWs)。纳米线是由六方纤锌矿型氧化锌晶体构成,在孔道内呈现无规纳米线团形貌,且分散良好、结构稳定,其直径为15-20 nm。ZnO NWs/SiO2复合能有效负载四羧基酞菁铁(Fe(Ⅲ)-taPc),最高负载量(质量分数)为11.5%。进一步制备出Fe(Ⅲ)-taPc/ZnO NWs/SiO2三元复合光催化剂,通过扫描电镜(SEM)、粉末衍射(XRD)、紫外-可见漫反射光谱(UV-Vis)、Raman光谱(Raman)对其进行表征,并以有机染料罗丹明B为目标降解物考察了其可见光光催化降解性能。结果表明,在可见光照射下三元催化剂能快速催化降解罗丹明B,降解反应遵守一级动力学方程。Fe(Ⅲ)-taPc负载量(质量分数)为3.5%的三元复合光催化剂显示出最高的活性,在60 min内使罗丹明B的降解率达到98.6%,ZnO NWs的存在使Fe(Ⅲ)-taPc的光催化活性平均提高77%。6次循环使用后三元复合催化剂的活性没有明显下降,表明催化剂性能稳定,可重复使用多次。
Zinc oxide nanowires (ZnO NWs) were grown in-situ in SiO2 macroporous materials by in-situ seed crystal formation and hydrothermal synthesis. Nanowires are made of hexagonal wurtzite zinc oxide crystals, exhibiting random nanowire morphology in the pores, well dispersed, and structurally stable, with a diameter of 15-20 nm. ZnO NWs / SiO2 composite can effectively support tetracarboxylic phthalocyanine iron (Fe (Ⅲ) -taPc) with the highest loading (mass fraction) of 11.5%. The Fe (Ⅲ) -taPc / ZnO NWs / SiO2 ternary composite photocatalyst was further prepared by scanning electron microscopy (SEM), powder diffraction (XRD), UV-Vis, Raman spectroscopy Its characterization, and the organic dye rhodamine B as the target degradation of visible light photocatalytic degradation. The results show that under visible light irradiation, the three-way catalyst can rapidly catalyze the degradation of rhodamine B, and the degradation reaction complies with the first-order kinetic equation. The ternary composite photocatalyst with Fe (Ⅲ) -taPc loading of 3.5% showed the highest activity and the degradation rate of Rhodamine B reached 98.6% within 60 min. The presence of ZnO NWs made Fe (Ⅲ) ) -taPc increased the photocatalytic activity by an average of 77%. No significant decrease in activity of the ternary composite catalyst after 6 cycles indicates that the catalyst performance is stable and can be reused many times.