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Rangkooy HA, Mokaramian S, Zargar B. Photocatalytic Removal of Toluene Vapour Pollutant from the Air Using Titanium Dioxide Nanoparticles Supported on the Natural Zeolite. IRANIAN JOURNAL OF PUBLIC HEALTH 2023; 52:184-192. [PMID: 36824235 PMCID: PMC9941430 DOI: 10.18502/ijph.v52i1.11681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 10/12/2021] [Indexed: 01/17/2023]
Abstract
Background The emission of volatile organic compounds (VOCs) in industrial and urban areas has adverse effects on the environment and human health. Toluene, the main pollutant among the VOCs, has wide applications in different industries such as plastics, adhesives, silicone sealant, paint, etc. This study aimed to remove of toluene from the air by using TiO2 nanoparticles supported on the natural zeolite using the photo-catalytic process. Methods This is an experimental study that was conducted in 2017 in the Chemical Agents Laboratory of the Occupational Health Engineering Department at Jundishapur University in Ahvaz. Toluene vapour decomposition was carried out using UV/ZE, UV/TiO2, and UV/TiO2-ZE under continuous flows conditions. The effects of toluene initial concentration, retention time, and nanocomposite surface weight on toluene vapour decomposition were also investigated. Results When UV/TiO2 and UV/TiO2-ZE systems are performed, increasing the initial toluene concentration reduces the efficiency of photocatalytic decomposition. The SEM images of TiO2-ZE catalyst show that zeolite pores were occupied by titanium dioxide nanoparticles. Moreover, the combination of titanium dioxide nanoparticles and zeolite has an incremental effect on toluene decomposition. Increasing retention time raises toluene decomposition, and the increased nanocomposite surface weight raises decomposition to the maximum level (70%) at 33.68 mg/cm2 weight and then decreases. Conclusion The increasing toluene decomposition rate by using the TiO2-ZE nanocomposite can be due to the incremental effect of absorption and photocatalytic decomposition.
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Affiliation(s)
- Hossein Ali Rangkooy
- Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Shahla Mokaramian
- Department of Occupational Health, Health Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,Corresponding Author:
| | - Behrooz Zargar
- Department of Chemistry, Shahid Chamran University of Ahvaz, Ahvaz, Iran
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Mao H, Tang J, Chen J, Wan J, Hou K, Peng Y, Halat DM, Xiao L, Zhang R, Lv X, Yang A, Cui Y, Reimer JA. Designing hierarchical nanoporous membranes for highly efficient gas adsorption and storage. SCIENCE ADVANCES 2020; 6:6/41/eabb0694. [PMID: 33028517 PMCID: PMC7541071 DOI: 10.1126/sciadv.abb0694] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 08/21/2020] [Indexed: 05/14/2023]
Abstract
Nanoporous membranes with two-dimensional materials such as graphene oxide have attracted attention in volatile organic compounds (VOCs) and H2 adsorption because of their unique molecular sieving properties and operational simplicity. However, agglomeration of graphene sheets and low efficiency remain challenging. Therefore, we designed hierarchical nanoporous membranes (HNMs), a class of nanocomposites combined with a carbon sphere and graphene oxide. Hierarchical carbon spheres, prepared following Murray's law using chemical activation incorporating microwave heating, act as spacers and adsorbents. Hierarchical carbon spheres preclude the agglomeration of graphene oxide, while graphene oxide sheets physically disperse, ensuring structural stability. The obtained HNMs contain micropores that are dominated by a combination of ultramicropores and mesopores, resulting in high VOCs/H2 adsorption capacity, up to 235 and 352 mg/g at 200 ppmv and 3.3 weight % (77 K and 1.2 bar), respectively. Our work substantially expands the potential for HNMs applications in the environmental and energy fields.
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Affiliation(s)
- Haiyan Mao
- Department of Chemical and Biomolecular Engineering, Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Jing Tang
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 S and Hill Road, Menlo Park, CA 94025, USA
| | - Jun Chen
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Jiayu Wan
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Kaipeng Hou
- Department of Chemical and Biomolecular Engineering, Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Yucan Peng
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - David M Halat
- Department of Chemical and Biomolecular Engineering, Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
- Materials Science Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
| | - Liangang Xiao
- Materials Science Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
| | - Rufan Zhang
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Xudong Lv
- Department of Chemical and Biomolecular Engineering, Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Ankun Yang
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Yi Cui
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 S and Hill Road, Menlo Park, CA 94025, USA
| | - Jeffrey A Reimer
- Department of Chemical and Biomolecular Engineering, Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
- Materials Science Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
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Derakhshan-Nejad A, Rangkooy HA, Cheraghi M, Yengejeh RJ. Removal of ethyl benzene vapor pollutant from the air using TiO 2 nanoparticles immobilized on the ZSM-5 zeolite under UVradiation in lab scale. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:201-209. [PMID: 32399232 PMCID: PMC7203389 DOI: 10.1007/s40201-020-00453-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 01/29/2020] [Indexed: 05/24/2023]
Abstract
Ethyl benzene is a volatile organic compound that is used in the many industries, including Oil and Gas, Oil colored and Insecticides. Due to the toxic effects of this chemical substance control and elimination of this vapor is necessary. Photo catalytic degradation is a possible method to remove organic compounds from air. This study was performed to determine the efficiency of photo catalytic removal of ethyl benzene vapor using TiO2 nanoparticles immobilized on the ZSM-5 zeolite under UV radiation. This was an experimental study. The surface and volume of the pores of the bed were determined by the Bruner-Emmett-Teller (BET) method and Surface structure was determined by Scanning Electron Microscope (SEM), EDAX and X-Ray Diffraction (XRD). Dynamic air flow and different concentrations of ethyl benzene (25, 75 and 125 ppm) and flow rates (0.5, 0.7, and 1.0 L/min) were produced and the removal efficiency of ethyl benzene vapor were investigated using ZSM-5 and TiO2/ZSM-5/UV processes. The temperature and relative humidity were set at 25 ± 2°c and 35%. Evaluations for BET showed the specific surface areas decreased after loading TiO2 on ZSM-5. XRD and EDAX analysis and SEM images showed that zeolite structure was stabled and nanoparticles were successfully stabilized on Ze. The results showed that the highest removal efficiency (52%) by the process of TiO2/ZSM-5/UV (5 wt%) at concentration 25 ppm and flow rate 0.5 L/min respectively. The result of this study showed that the TiO2/ZSM-5catalyst may be a applicable and hopeful method to removal of ethyl benzene from air flow under UV irradiation.
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Affiliation(s)
- Azam Derakhshan-Nejad
- Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
| | - Hossein Ali Rangkooy
- Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mahboobeh Cheraghi
- Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
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