Zhao, Shufang Ji, Yujing Jeong, Miyeon Choe, Huicheol Lee, Jea Won Kim, Soong Yeon Saqlain, Shahid Peng, Zhikun Liu, Zhongyi Kim, Young Dok 2024-01-19T11:30:54Z 2024-01-19T11:30:54Z 2022-06-09 2022-09 1385-8947 https://pubs.kist.re.kr/handle/201004/114762 Various amounts of K were deposited on TiO2 (P25), and the resulting structures were used as photocatalysts for acetaldehyde and NO oxidation. For acetaldehyde under dry and moderately humid conditions, 0.008 wt% of K boosted photocatalytic activity, whereas higher K contents resulted in declined activity. A small amount of K modified the lattice and optical properties of TiO2, resulting in the enhanced photocatalytic activity, whereas excessive K formed separate and less active K-compound structures on the TiO2 surface. In contrast, the photocatalytic activity was gradually decreased with increasing K content for acetaldehyde oxidation under higher humidity conditions, whereas the NO3- selectivity for NO oxidation gradually increased as K content increased. We highlight different roles of K species in TiO2 samples with dissimilar structural properties, and the necessity of fine adjustment of the K content in K-TiO2, depending on the reactions and conditions, to which photocatalysts are applied. English ELSEVIER SCIENCE SA Enhanced photocatalytic activity of TiO2 by K incorporation towards acetaldehyde and NO oxidation: The role of K single-ion dopants and additional K-compound structures Article 10.1016/j.cej.2022.136500 1 CHEMICAL ENGINEERING JOURNAL, v.444 CHEMICAL ENGINEERING JOURNAL 444 N scie scopus 000800420200007 Engineering, Environmental Engineering, Chemical Engineering Article GAS CATALYSTS REMOVAL K doped TiO 2 lattice Acetaldehyde and NO oxidation UV light-driven photocatalysis XPS Operando DRIFTS