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Drdova S, Giannakou M, Jiang F, Lin L, Sivaraman D, Toth R, Graule T, Braun A, Ilavsky J, Kuzmenko I, Wang J. Aerosol-Assisted Deposition for TiO2 Immobilization on Photocatalytic Fibrous Filters for VOC Degradation. Front Chem 2022; 10:887431. [PMID: 35646823 PMCID: PMC9130724 DOI: 10.3389/fchem.2022.887431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/12/2022] [Indexed: 11/13/2022] Open
Abstract
Atomization and spraying are well-established methods for the production of submicrometer- and micrometer- sized powders. In addition, they could be of interest to the immobilization of photocatalytic nanoparticles onto supports because they enable the formation of microporous films with photocatalytic activity. Here, we provide a comparison of aerosol-assisted immobilization methods, such as spray-drying (SD), spray atomization (SA), and spray gun (SG), which were used for the deposition of TiO2 dispersions onto fibrous filter media. The morphology, microstructure, and electronic properties of the structures with deposited TiO2 were characterized by SEM and TEM, BET and USAXS, and UV-Vis spectrometry, respectively. The photocatalytic performances of the functionalized filters were evaluated and compared to the benchmark dip-coating method. Our results showed that the SG and SA immobilization methods led to the best photocatalytic and operational performance for the degradation of toluene, whereas the SD method showed the lowest degradation efficiency and poor stability of coating. We demonstrated that TiO2 sprays using the SG and SA methods with direct deposition onto filter media involving dispersed colloidal droplets revealed to be promising alternatives to the dip-coating method owing to the ability to uniformly cover the filter fibers. In addition, the SA method allowed for fast and simple control of the coating thickness as the dispersed particles were continuously directed onto the filter media without the need for repetitive coatings, which is common for the SG and dip-coating methods. Our study highlighted the importance of the proper immobilization method for the efficient photocatalytic degradation of VOCs.
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Affiliation(s)
- Sarka Drdova
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Marianna Giannakou
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Fuze Jiang
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Luchan Lin
- Laboratory for Joining Technologies and Corrosion, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Deeptanshu Sivaraman
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Rita Toth
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Thomas Graule
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Artur Braun
- Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - Jan Ilavsky
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, United States
| | - Ivan Kuzmenko
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, United States
| | - Jing Wang
- Institute of Environmental Engineering, ETHZ, Zürich, Switzerland
- Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
- *Correspondence: Jing Wang,
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Strob R, Dobrowolski A, Pieloth D, Schaldach G, Wiggers H, Walzel P, Thommes M. Preparation and characterization of spray-dried submicron particles for pharmaceutical application. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.09.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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