Bohač Mario, Čižmar Tihana, Kojić Vedran, Marčec Jan, Juraić Krunoslav, Grčić Ivana, Gajović Andreja
Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
Faculty of Geotechnical Engineering, University of Zagreb, Hallerova aleja 7, 42000 Varaždin, Croatia.
Nanomaterials (Basel). 2021 Oct 14;11(10):2714. doi: 10.3390/nano11102714.
A novel low-cost synthesis of barium-modified TiO nanotube (TNT) arrays was used to obtain an immobilized photocatalyst for degradation of diclofenac. TNT arrays were prepared by electrochemical anodization of titanium thin films deposited on fluorine-doped tin oxide (FTO) coated glass by magnetron sputtering, ensuring transparency and immobilization of the nanotubes. The Ba-modifications were obtained by annealing solutions of Ba(OH) spin coated on top of TNT. Three different concentrations of Ba(OH) were used (12.5 mM, 25 mM and 50 mM). The crystalline structure, morphology and presence of Ba were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Ba-modified TiO nanotubes (BTNT) were tested for photocatalytic degradation of diclofenac under UV/Vis radiation and it was proven that all of the Ba-modified samples showed an increase in photocatalytic activity with respect to the unmodified TNTs. The most efficient photocatalyst was the sample prepared with 25 mM Ba(OH) which showed 90% diclofenac degradation after 60 min. This result was in agreement with cyclic voltammetry measurements that showed the largest increase in photo-oxidation current densities for the same sample due to the increased generation of OH radicals obtained by a more efficient photogenerated charge separation.
一种新型低成本合成钡改性二氧化钛纳米管（TNT）阵列的方法被用于制备一种用于降解双氯芬酸的固定化光催化剂。通过对磁控溅射沉积在氟掺杂氧化锡（FTO）涂层玻璃上的钛薄膜进行电化学阳极氧化来制备TNT阵列，以确保纳米管的透明度和固定化。通过对旋涂在TNT顶部的Ba(OH)₂溶液进行退火处理来实现钡改性。使用了三种不同浓度的Ba(OH)₂（12.5 mM、25 mM和50 mM）。分别通过X射线衍射、扫描电子显微镜和能量色散X射线光谱对晶体结构、形态和钡的存在情况进行了表征。对钡改性二氧化钛纳米管（BTNT）在紫外/可见光辐射下光催化降解双氯芬酸的性能进行了测试，结果表明，所有钡改性样品相对于未改性的TNT光催化活性均有所提高。最有效的光催化剂是用25 mM Ba(OH)₂制备的样品，该样品在60分钟后双氯芬酸降解率达到90%。这一结果与循环伏安法测量结果一致，该测量结果表明，由于更有效的光生电荷分离导致产生更多的羟基自由基，同一样品的光氧化电流密度增加幅度最大。
