Pliekhova O, Arčon I, Pliekhov O, Tušar N Novak, Štangar U Lavrenčič
University of Nova Gorica, Vipavska 13, SI-5000, Nova Gorica, Slovenia.
Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia.
Environ Sci Pollut Res Int. 2017 May;24(14):12571-12581. doi: 10.1007/s11356-016-7685-y. Epub 2016 Sep 22.
The rate of methylene blue and terephthalic acid degradation assisted with double metal-modified catalyst (0.1 mol% Cu and 1.0 mol% Zr) was enhanced as compared with single metal-modified catalysts (0.1, 0.5 mol% Cu and 1.0 mol% Zr). The wet impregnation method was used for copper and zirconium modification of the surface of Aeroxide P25 TiO particles. Simultaneous loading of both metals on the surface of P25 leads to an increased specific surface area of the obtained material despite negative Cu influence. The tendency of stabilization and agglomerate size rising with the time for Cu and Zr-modified catalysts were traced by dynamic light scattering (DLS) measurements. The observed optical characteristics suggest that Cu compensated the broadening of band gap caused by Zr loading. Crystal structure of obtained photocatalysts was explored by XRD; morphological data and particle size were obtained by SEM. EDX was used for Zr and Cu content determination. Cu K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) analytical techniques were used to investigate the local Cu neighbourhood in the samples and to identify copper coordination and valence state of copper species in the synthesized nanocomposites.
与单金属改性催化剂（0.1、0.5 mol% 的铜和 1.0 mol% 的锆）相比，双金属改性催化剂（0.1 mol% 的铜和 1.0 mol% 的锆）辅助下亚甲基蓝和对苯二甲酸的降解速率有所提高。采用湿浸渍法对Aeroxide P25 TiO颗粒表面进行铜和锆改性。尽管铜有负面影响，但两种金属同时负载在P25表面会使所得材料的比表面积增加。通过动态光散射（DLS）测量追踪了铜和锆改性催化剂的稳定性趋势以及团聚体尺寸随时间的增加情况。观察到的光学特性表明，铜补偿了由锆负载引起的带隙展宽。通过X射线衍射（XRD）探索了所得光催化剂的晶体结构；通过扫描电子显微镜（SEM）获得了形态数据和粒径。能量色散X射线光谱（EDX）用于测定锆和铜的含量。采用铜K边扩展X射线吸收精细结构（EXAFS）和X射线吸收近边结构（XANES）分析技术研究样品中铜的局部环境，并确定合成纳米复合材料中铜物种的铜配位和价态。
