| Title: | Enhanced photocatalytic performance of visible-light-driven CuO(x)/TiO(2-x) for degradation of gaseous formaldehyde: Roles of oxygen vacancies and nano copper oxides |
| Author(s): | Wang Y; Gao P; Li B; Yin Z; Feng L; Liu Y; Du Z; Zhang L; |
| Address: | "Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, Beijing Forestry University, Beijing, 100083, China. Hebei Province Key Laboratory of Sustained Utilization & Development of Water Recourse, Hebei Province Collaborative Innovation Center for Sustainable Utilization of Water Resources and Optimization of Industrial Structure, Department of Water Resource and Environment, Hebei GEO University, No. 136 Huai'an Road, Shijiazhuang, 050031, Hebei, PR China. Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, Beijing Forestry University, Beijing, 100083, China. Electronic address: fengli_hit@163.com. Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, Beijing Forestry University, Beijing, 100083, China. Electronic address: zhangliqiu@163.com" |
| DOI: | 10.1016/j.chemosphere.2021.133007 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Photocatalysis is an effective method for the removal of formaldehyde (HCHO), and high-efficiency visible-light-driven photocatalysts were urgently required. Herein, oxygen vacancies (OVs) and nano copper oxides (CuO(x)) synergistically modified TiO(2) (CuO(x)/TiO(2-x)) photocatalysts were synthesized by one-step hydrothermal followed by impregnation method. The photocatalytic decomposition of HCHO reached 100% at initial concentration of 180 ppm under relative humidity (RH) = 60% by 0.1g CuO(x)/TiO(2-x) in 150 min visible light irradiation. Characterization results explored the complementary effect of OVs and CuO(x) systematically. The OVs increased the separation efficiency of photogenerated charge carriers and act as adsorption/active sites in HCHO photocatalytic oxidation. The moisture and O(2) were adsorbed and actived by OVs to generate reactive oxygen species (ROS). After doped CuO(x) on the surface of TiO(2-x), the photoexcited electrons in Cu(2)O could transfer to the conduction band (CB) of TiO(2-x) and the photoexcited electrons of TiO(2-x) could be captured by Cu nanoparticles. Therefore, more ROS were generated due to the synergistic effect of OVs and CuO(x). The In-situ Fourier transform infrared (in-situ FTIR) measurements show the hydroxyl radical (*OH) was the dominant radical in HCHO photocatalytic oxidation, while *O(2)(-) could also upgrade the photodegradation efficiency of HCHO. Furthermore, the stability tests showed the degradation efficiency of HCHO still reached 90% after five recycles, indicating that CuO(x)/TiO(2-x) nanocomposites displayed a stable and high photoactivity in volatile organic compounds (VOCs) decomposition" |
| Keywords: | Catalysis Copper Formaldehyde *Gases Light Oxides *Oxygen Titanium Formaldehyde (HCHO) Nano copper oxides (CuO(x)) Oxygen vacancies (OVs) Photocatalysis; |
| Notes: | "MedlineWang, Yang Gao, Peng Li, Benhang Yin, Ze Feng, Li Liu, Yongze Du, Ziwen Zhang, Liqiu eng England 2021/11/27 Chemosphere. 2022 Mar; 291(Pt 1):133007. doi: 10.1016/j.chemosphere.2021.133007. Epub 2021 Nov 23" |
