Division of Biotechnology, Brain Korea 21 Plus Program, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University , Iksan, 54596, Korea.
Analytical Research Division, Korea Basic Science Institute , Jeonju, Jeollabuk-do, 54907, South Korea.
ACS Appl Mater Interfaces. 2017 Jul 19;9(28):23602-23613. doi: 10.1021/acsami.7b02104. Epub 2017 Jul 10.
In the present work, we accomplish the boosting of photocatalytic performance by the synergistic effect of acid treatment and transition metal oxide co-catalysts on molten salt rutile TiO nanorods. FT-IR and XPS (oxygen deconvolution) results confirmed that the amount of hydroxyl groups increased on the surface of rutile TiO nanorods (TO-NRs) after acid treatment. HR-TEM analysis revealed fine dispersion of metal oxide on the surface of acid treated TiO nanorods (ATO-NRs). The photocatalytic activities of as-prepared (TO-NRs), acid treated (ATO-NRs), metal oxide loaded (MTO-NRs), and both acid treated and metal oxide loaded (MATO-NRs) nanorods were compared based on the rate kinetics and dye degradation efficiencies. Cobalt oxide (1 wt %) loaded and 1.0 M acid treated TiO nanorods (Co/ATO-NR) exhibited the higher photocatalytic degradation efficiency for Orange-II dye degradation and inactivation of S. typhimurium pathogen compared to other photocatalysts under solar irradiation. Photoelectrochemical analysis demonstrated that the charge transfer process in Co/ATO-NR is significantly higher than that in the untreated samples. The improved photocatalytic activity of inactive TO-NRs might be due to enhanced charge transfer of finely dispersed metal oxides on the OH-rich surface of acid treated TiO nanorods.
在本工作中，我们通过酸处理和过渡金属氧化物共催化剂在熔盐锐钛矿 TiO 纳米棒上的协同作用来实现光催化性能的提升。FT-IR 和 XPS（氧分解）结果证实，酸处理后锐钛矿 TiO 纳米棒（TO-NRs）表面的羟基数量增加。高分辨透射电子显微镜（HR-TEM）分析表明，金属氧化物在酸处理 TiO 纳米棒（ATO-NRs）表面得到了很好的分散。基于速率动力学和染料降解效率，比较了制备的（TO-NRs）、酸处理的（ATO-NRs）、负载金属氧化物的（MTO-NRs）以及酸处理和负载金属氧化物的（MATO-NRs）纳米棒的光催化活性。在太阳能照射下，负载 1 重量%氧化钴（Co/ATO-NR）和 1.0 M 酸处理的 TiO 纳米棒对橙色-II 染料的光催化降解和鼠伤寒沙门氏菌病原体的失活表现出比其他光催化剂更高的降解效率。光电化学分析表明，Co/ATO-NR 中的电荷转移过程明显高于未处理样品。无活性 TO-NRs 的光催化活性提高可能是由于酸处理 TiO 纳米棒富 OH 表面上分散的金属氧化物的电荷转移增强所致。
