Zouzelka Radek, Olejnicek Jiri, Ksirova Petra, Hubicka Zdenek, Duchon Jan, Martiniakova Ivana, Muzikova Barbora, Mergl Martin, Kalbac Martin, Brabec Libor, Kocirik Milan, Remzova Monika, Vaneckova Eva, Rathousky Jiri
J. Heyrovsky Institute of Physical Chemistry, Czech Academy of Sciences, Dolejskova 3, 182 23 Prague, Czech Republic.
Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic.
Nanomaterials (Basel). 2021 Nov 30;11(12):3254. doi: 10.3390/nano11123254.
Heterogeneous photocatalysis of TiO is one of the most efficient advanced oxidation processes for water and air purification. Here, we prepared hierarchical TiO layers (Spikelets) by hollow-cathode discharge sputtering and tested their photocatalytic performance in the abatement of inorganic (NO, NO) and organic (4-chlorophenol) pollutant dispersed in air and water, respectively. The structural-textural properties of the photocatalysts were determined via variety of physico-chemical techniques (XRD, Raman spectroscopy, SEM, FE-SEM. DF-TEM, EDAX and DC measurements). The photocatalysis was carried out under conditions similar to real environment conditions. Although the abatement of NO and NO was comparable with that of industrial benchmark Aeroxide TiO P25, the formation of harmful nitrous acid (HONO) product on the Spikelet TiO layers was suppressed. Similarly, in the decontamination of water by organics, the mineralization of 4-chlorophenol on Spikelet layers was interestingly the same, although their reaction rate constant was three-times lower. The possible explanation may be the more than half-magnitude order higher external quantum efficacy (EQE) compared to that of the reference TiO P25 layer. Therefore, such favorable kinetics and reaction selectivity, together with feasible scale-up, make the hierarchical TiO layers very promising photocatalyst which can be used for environmental remediation.
TiO的多相光催化是水和空气净化中最有效的高级氧化过程之一。在此，我们通过空心阴极放电溅射制备了分级TiO层（小穗状），并分别测试了它们在去除分散于空气和水中的无机污染物（NO、NO）和有机污染物（4-氯苯酚）方面的光催化性能。通过多种物理化学技术（XRD、拉曼光谱、SEM、FE-SEM、DF-TEM、EDAX和DC测量）确定了光催化剂的结构-织构性质。光催化在类似于实际环境条件下进行。尽管NO和NO的去除效果与工业基准Aeroxide TiO P25相当，但小穗状TiO层上有害亚硝酸（HONO）产物的形成受到了抑制。同样，在有机物对水的净化中，小穗状层上4-氯苯酚的矿化程度有趣地相同，尽管其反应速率常数低三倍。可能的解释是，与参考TiO P25层相比，其外部量子效率（EQE）高出半个数量级以上。因此，这种有利的动力学和反应选择性，以及可行的放大规模，使得分级TiO层成为一种非常有前景的可用于环境修复的光催化剂。
