| Title: | Experimental and modeling study of visible light responsive photocatalytic oxidation (PCO) materials for toluene degradation |
| Author(s): | Zhong L; Brancho JJ; Batterman S; Bartlett BM; Godwin C; |
| Address: | "Environmental Health Sciences, University of Michigan, Ann Arbor, MI, USA. Chemistry, University of Michigan, Ann Arbor, MI, USA" |
| DOI: | 10.1016/j.apcatb.2017.05.047 |
| ISSN/ISBN: | 0926-3373 (Print) 0926-3373 (Linking) |
| Abstract: | "Only limited research has examined the development and application of visible light responsive photocatalytic oxidation (PCO), although such materials have great potential for mitigating concentrations of volatile organic compounds (VOCs) when applied to building surfaces. This study evaluates the performance and characteristics of a visible light responsive photocatalyst, specially, a co-alloyed TiNbON compound with a band energy of 2.3 eV. The PCO material was developed using urea-glass synthesis, characterized by scanning electron microscopy (SEM), diffuse reflectance spectra (DRS), powder X-ray diffraction (PXRD), and Brunauer-Emmett-Teller (BET) methods, and VOC removal efficiency was measured under visible light for toluene (1-5 ppm) at room temperature (21.5 degrees C) and a range of relative humidity (RH: 25 to 65%), flow rate (0.78 to 7.84 cm/s), and irradiance (42 to 95 W/m(2)). A systematic parametric evaluation of kinetic parameters was conducted. In addition, we compared TiNbON with a commercial TiO(2)-based material under black light, estimated TiNbON's long-term durability and stability, and tested its ability to thermally regenerate. Using mass transfer and kinetic analysis, three different Langmuir-Hinshelwood (LH) type reaction rate expressions were proposed and evaluated. A LH model considering one active site and competitive sorption of toluene and water was superior to others. The visible-light driven catalyst was able to remove up to 58 % of the toluene, generated less formaldehyde than the commercial TiO(2), could be fully regenerated at 150 degrees C, and had reasonable durability and stability. This evaluation of TiNbON shows the potential to remove VOCs and improve air quality for indoor applications. Further research is needed to evaluate the potential for harmful by-products, to identify optimal conditions, and to use field tests to show real-world performance" |
| Keywords: | Photocatalytic oxidation (PCO) formaldehyde indoor air quality (IAQ) visible light volatile organic compounds (VOCs); |
| Notes: | "PubMed-not-MEDLINEZhong, Lexuan Brancho, James J Batterman, Stuart Bartlett, Bart M Godwin, Christopher eng P30 ES017885/ES/NIEHS NIH HHS/ T42 OH008455/OH/NIOSH CDC HHS/ Netherlands 2018/06/05 Appl Catal B. 2017 Nov 5; 216:122-132. doi: 10.1016/j.apcatb.2017.05.047. Epub 2017 May 19" |
