Slapničar Špela, Žerjav Gregor, Németh Miklós, Zavašnik Janez, Pintar Albin
Department of Inorganic Chemistry and Technology, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
Department of Surface Chemistry and Catalysis, Institute for Energy Security and Environmental Safety, HUN-REN Centre for Energy Research, Konkoly-Thege M. Street 29-33, H-1121 Budapest, Hungary.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 1):138361. doi: 10.1016/j.jcis.2025.138361. Epub 2025 Jul 7.
This study investigates the improvement of the photocatalytic activity of TiO-based catalysts modified with plasmonic metal nanoparticles (PM). Gold (Au), silver (Ag) and platinum (Pt) nanoparticles were uniformly deposited on TiO nanorods (TNR) by a wet impregnation method, achieving a uniform metal loading of 1.0 wt%, which was confirmed by SEM-EDXS analysis. The size of the metallic particles varied, with Pt being the smallest (1.5 nm) and Au the largest (45 nm), while all exhibited a uniform distribution over the TiO surface. The size of the PM nanoparticles was influenced by the pH of the precursor solutions and the isoelectric point of the TNR support. Photoluminescence (PL) measurements showed that TNR-Pt exhibited the lowest charge carrier recombination rate and the highest photocatalytic performance. Tests with reactive oxygen species (ROS) under visible-light exposure showed that TNR-Pt generated the most superoxide anion (O) and hydroxyl (OH) radicals and achieved the highest degradation rate of bisphenol A (BPA). In contrast, TNR-Au showed the lowest ROS formation and BPA conversion rate. The superior performance of the TNR-Pt photocatalyst is attributed to its energy band distribution, which accelerates the oxygen reduction reaction. The results show that O are the primary reactive species responsible for the degradation of BPA, with the small size of Pt nanoparticles promoting ROS production and pollutant degradation, making TNR-Pt the most effective catalyst among the solids investigated in this study.
本研究考察了用等离子体金属纳米粒子（PM）改性的TiO基催化剂光催化活性的提高。通过湿浸渍法将金（Au）、银（Ag）和铂（Pt）纳米粒子均匀沉积在TiO纳米棒（TNR）上，实现了1.0 wt%的均匀金属负载量，这通过扫描电子显微镜-能量色散X射线光谱（SEM-EDXS）分析得到证实。金属颗粒的尺寸各不相同，Pt最小（1.5 nm），Au最大（45 nm），而所有颗粒在TiO表面均呈现均匀分布。PM纳米粒子的尺寸受前驱体溶液的pH值和TNR载体的等电点影响。光致发光（PL）测量表明，TNR-Pt表现出最低的电荷载流子复合率和最高的光催化性能。在可见光照射下对活性氧（ROS）进行的测试表明，TNR-Pt产生的超氧阴离子（O）和羟基（OH）自由基最多，双酚A（BPA）的降解率最高。相比之下，TNR-Au的ROS生成量和BPA转化率最低。TNR-Pt光催化剂的优异性能归因于其能带分布，这加速了氧还原反应。结果表明，O是负责降解BPA的主要活性物种，Pt纳米粒子的小尺寸促进了ROS的产生和污染物的降解，使TNR-Pt成为本研究中所考察的固体催化剂中最有效的催化剂。
