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Baskaran D, Dhamodharan D, Behera US, Byun HS. A comprehensive review and perspective research in technology integration for the treatment of gaseous volatile organic compounds. ENVIRONMENTAL RESEARCH 2024; 251:118472. [PMID: 38452912 DOI: 10.1016/j.envres.2024.118472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/04/2024] [Accepted: 02/10/2024] [Indexed: 03/09/2024]
Abstract
Volatile organic compounds (VOCs) are harmful pollutants emitted from industrial processes. They pose a risk to human health and ecosystems, even at low concentrations. Controlling VOCs is crucial for good air quality. This review aims to provide a comprehensive understanding of the various methods used for controlling VOC abatement. The advancement of mono-functional treatment techniques, including recovery such as absorption, adsorption, condensation, and membrane separation, and destruction-based methods such as natural degradation methods, advanced oxidation processes, and reduction methods were discussed. Among these methods, advanced oxidation processes are considered the most effective for removing toxic VOCs, despite some drawbacks such as costly chemicals, rigorous reaction conditions, and the formation of secondary chemicals. Standalone technologies are generally not sufficient and do not perform satisfactorily for the removal of hazardous air pollutants due to the generation of innocuous end products. However, every integration technique complements superiority and overcomes the challenges of standalone technologies. For instance, by using catalytic oxidation, catalytic ozonation, non-thermal plasma, and photocatalysis pretreatments, the amount of bioaerosols released from the bioreactor can be significantly reduced, leading to effective conversion rates for non-polar compounds, and opening new perspectives towards promising techniques with countless benefits. Interestingly, the three-stage processes have shown efficient decomposition performance for polar VOCs, excellent recoverability for nonpolar VOCs, and promising potential applications in atmospheric purification. Furthermore, the review also reports on the evolution of mathematical and artificial neural network modeling for VOC removal performance. The article critically analyzes the synergistic effects and advantages of integration. The authors hope that this article will be helpful in deciding on the appropriate strategy for controlling interested VOCs.
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Affiliation(s)
- Divya Baskaran
- Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea; Department of Biomaterials, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Chennai-600077, India
| | - Duraisami Dhamodharan
- Interdisciplinary Research Centre for Refining and Advanced Chemicals, King Fahd, University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Uma Sankar Behera
- Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea
| | - Hun-Soo Byun
- Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea.
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Xu L, Xu X, Xu Y, Huang M, Li Y. Release mechanism of UV responded chitosan-decorated TiO 2 microcapsules: Regulation of humidity. Food Chem 2024; 433:137170. [PMID: 37666123 DOI: 10.1016/j.foodchem.2023.137170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 08/05/2023] [Accepted: 08/13/2023] [Indexed: 09/06/2023]
Abstract
In this research, the synergistic influences of UV light and relative humidity on the structure and immediate triggered release abilities of microcapsules loaded with oregano essential oil (OEO) were investigated. The microcapsules sufficiently were encouraged to release OEO by UV irradiation and regulated by ambient humidity. Relatively low humidity from 23 to 58% had no impact on the encapsulation efficiency and release processes of microcapsules in food simulations and air significantly. Analysis of microstructure showed that UV irradiation and higher relative humidity were conducive to fracturing glycosidic bonds of microcapsule shell through hydroxyl radicals generated by TiO2 and vapour. Finally, microcapsules were applied to the preservation of chicken breasts for 6 d and the results showed that chicken breasts with microcapsules that had been irradiated by UV light at 76 %RH would have better quality and the shelf life was extended, which evidenced its excellent foreground in meat preservation.
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Affiliation(s)
- Lina Xu
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Xinglian Xu
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China.
| | - Yujuan Xu
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Mingyuan Huang
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Yali Li
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
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Investigation of photocatalytic-proxone process performance in the degradation of toluene and ethyl benzene from polluted air. Sci Rep 2023; 13:4000. [PMID: 36899090 PMCID: PMC10006189 DOI: 10.1038/s41598-023-31183-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
In this study, toluene and ethylbenzene were degraded in the photocatalytic-proxone process using BiOI@NH2-MIL125(Ti)/Zeolite nanocomposite. The simultaneous presence of ozone and hydrogen peroxide is known as the proxone process. Nanocomposite Synthesis was carried out using the solvothermal method. Inlet airflow, ozone concentrations, H2O2 concentrations, relative humidity, and initial pollutants concentrations were studied. The nanocomposite was successfully synthesized based on FT-IR, BET, XRD, FESEM, EDS element mapping, UV-Vis spectra and TEM analysis. A flow rate of 0.1 L min-1, 0.3 mg min-1 of ozone, 150 ppm of hydrogen peroxide, 45% relative humidity, and 50 ppmv of pollutants were found to be optimal operating conditions. Both pollutants were degraded in excess of 95% under these conditions. For toluene and ethylbenzene, the synergistic of mechanisms effect coefficients were 1.56 and 1.76, respectively. It remained above 95% efficiency 7 times in the hybrid process and had good stability. Photocatalytic-proxone processes were evaluated for stability over 180 min. The remaining ozone levels in the process was insignificant (0.01 mg min-1). The CO2 and CO production in the photocatalytic-proxone process were 58.4, 5.7 ppm for toluene and 53.7, and 5.5 ppm for ethylbenzene respectively. Oxygen gas promoted and nitrogen gas had an inhibitory effect on the effective removal of pollutants. During the pollutants oxidation, various organic intermediates were identified.
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Belkessa N, Serhane Y, Bouzaza A, Khezami L, Assadi AA. Gaseous ethylbenzene removal by photocatalytic TiO 2 nanoparticles immobilized on glass fiber tissue under real conditions: evaluation of reactive oxygen species contribution to the photocatalytic process. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:35745-35756. [PMID: 36538222 DOI: 10.1007/s11356-022-24636-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Photocatalytic oxidation (PCO) using a TiO2 catalyst is an effective technique to remove gaseous volatile organic compounds (VOCs). Herein, a lab-scale continuous reactor is used to investigate the photocatalytic performance toward ethylbenzene (EB) vapor removal over TiO2 nanoparticles immobilized on glass fiber tissue. The role of the reactive species in the removal of EB and the degradation pathway were studied. Firstly, the effect of key operating parameters such as EB concentration (13, 26, 60 mg/m3), relative humidity levels (From 5 to 80%), gas carrier composition (dry air + EB, O2 + EB and N2 + EB) and ultraviolet (UV) radiation wavelength (UV-A 365 nm, UV-C 254 nm) were explored. Then, using superoxide dismutase and tert-butanol as trapping agents, the real contribution of superoxide radical anion (O2.-) and hydroxyl radicals (OH.) to EB removal was quantified. The results show that (i) small water vapor content enhances the EB degradation; (ii) the reaction atmosphere plays an important role in the photocatalytic process; and (iii) oxygen atmosphere/UV-C radiation shows the highest EB degradation percentage. The use of radical scavengers confirms the major contribution of the hydroxyl radical to the photocatalytic mechanism with 75% versus 25% for superoxide radical anion.
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Affiliation(s)
- Nacer Belkessa
- Univ Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, ISCR (Institut Des Sciences Chimiques de Rennes) - UMR 6226, 35000, Rennes, France
| | - Youcef Serhane
- Univ Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, ISCR (Institut Des Sciences Chimiques de Rennes) - UMR 6226, 35000, Rennes, France
| | - Abdelkrim Bouzaza
- Univ Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, ISCR (Institut Des Sciences Chimiques de Rennes) - UMR 6226, 35000, Rennes, France
| | - Lotfi Khezami
- Department of Chemistry, Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O. Box 5701, Riyadh, 11432, Saudi Arabia
| | - Aymen Amin Assadi
- Univ Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, ISCR (Institut Des Sciences Chimiques de Rennes) - UMR 6226, 35000, Rennes, France.
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Zhang Q, Guo F, Yu L, Wang B, Ding J, Fan L, Wu Y, Yang B, Xu Q. Efficient Degradation of Toluene over MnO 2/TiO 2 Nanobelts under Vacuum Ultraviolet Irradiation. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c03256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Qi Zhang
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
| | - Fang Guo
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
| | - Liangyun Yu
- School of Light Industry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing100048, P. R. China
| | - Bailin Wang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
| | - Jingya Ding
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
| | - Lan Fan
- Yancheng Lanfeng Environmental Engineering Technology Co, Ltd, Yancheng224051, P. R. China
| | - Yifan Wu
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
| | - Bairen Yang
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
| | - Qi Xu
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng224051, P. R. China
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Mehralipour J, Jonidi Jafari A, Gholami M, Esrafili A, Kermani M. Photocatalytic-Proxone Process Application in the Degradation of Toluene-Diisocyante, and Methylene Diphenyl Diisocyanate from polluted air. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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7
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Fabrication and immediate release characterization of UV responded oregano essential oil loaded microcapsules by chitosan-decorated titanium dioxide. Food Chem 2023; 400:133965. [DOI: 10.1016/j.foodchem.2022.133965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 07/29/2022] [Accepted: 08/14/2022] [Indexed: 11/21/2022]
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Zhang Y, Wang Y, Xie R, Huang H, Leung MKH, Li J, Leung DYC. Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:16582-16601. [PMID: 36367480 DOI: 10.1021/acs.est.2c05444] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Photocatalysis is regarded as one of the most promising technologies for indoor volatile organic compounds (VOCs) elimination due to its low cost, safe operation, energy efficiency, and high mineralization efficiency under ambient conditions. However, the practical applications of this technology are limited, despite considerable research efforts in recent decades. Until now, most of the works were carried out in the laboratory and focused on exploring new catalytic materials. Only a few works involved the immobilization of catalysts and the design of reactors for practical applications. Therefore, this review systematically summarizes the research and development on photocatalytic oxidation (PCO) of VOCs, with emphasis on recent catalyst's immobilization and reactor designs in detail. First, different types of photocatalytic materials and the mechanisms for PCO of VOCs are briefly discussed. Then, both the catalyst's immobilization techniques and reactor designs are reviewed in detail. Finally, the existing challenges and future perspectives for PCO of VOCs are proposed. This work aims to provide updated information and research inspirations for the commercialization of this technology in the future.
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Affiliation(s)
- Yingguang Zhang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Yifei Wang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, 518071, China
| | - Ruijie Xie
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China
| | - Michael K H Leung
- School of Energy & Environment, City University of Hong Kong, Hong Kong, China
| | - Jiantao Li
- SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co., Ltd., Dalian 116045, China
| | - Dennis Y C Leung
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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Mehralipour J, Jafari AJ, Gholami M, Esrafili A, Kermani M. Synthesis of BiOI@NH 2-MIL125(Ti)/Zeolite as a novel MOF and advanced hybrid oxidation process application in benzene removal from polluted air stream. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2022; 20:937-952. [PMID: 36406604 PMCID: PMC9672198 DOI: 10.1007/s40201-022-00837-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
One of the popular process in volatile organic compounds removal in gas phase is advanced oxidation process. We in this research, synthesized BiOI@NH2-MIL125(Ti)/Zeolite nanocomposite as a novel nanocomposite to degradation of benzene in hybrid advanced oxidation process. The nanocomposite synthesized via solvothermal method. The effect of airflow, ozone gas concentration, hydrogen peroxide concentration, relative humidity and initial benzene concentration are the main parameters in the UV/O3/H2O2/ nanocomposite hybrid process that were studied. The characterization by XRD, FT-IR, FESEM, EDS element mapping, TEM, BET, and UV-vis spectra indicated that nanocomposite were well synthesized. Optimal operating conditions of the process were determined at air flow of 0.1 l/min, ozone concentration of 0.3 mg/min, hydrogen peroxide concentration of 150 ppm, relative humidity of 45 ± 3% and benzene concentration of 50 ppmv. Under these conditions, more than 99% of benzene was degraded. The synergistic effect coefficient of the mechanisms is 1.53. The nanocomposite had good stability in the hybrid process and remained above 99% efficiency up to 5 times. The ozone concentration residual the system was reported to be negligible (0.013 mg/min). The CO and CO2 emissions in the hybrid process was higher than other processes, which indicates better mineralization in the hybrid process. Formaldehyde, octane, noonan, phenol, decanoic acid were reported as the main by-products. The results indicated that UV/O3/H2O2/ nanocomposite hybrid process has fantastic efficiency in the degradation of benzene as one of the indicators of VOCs.
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Affiliation(s)
- Jamal Mehralipour
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
- Air Pollution Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Ahmad Jonidi Jafari
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
| | - Mitra Gholami
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
| | - Ali Esrafili
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
| | - Majid Kermani
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
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Almaie S, Vatanpour V, Rasoulifard MH, Koyuncu I. Volatile organic compounds (VOCs) removal by photocatalysts: A review. CHEMOSPHERE 2022; 306:135655. [PMID: 35817187 DOI: 10.1016/j.chemosphere.2022.135655] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 07/03/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
Amplified anthropogenic release of volatile organic compounds (VOCs) gets worse air quality and human health. Photocatalytic degradation of VOCs is the practical strategy due to its low cost, simplicity, high efficiency, and environmental sustainability. Different types of photocatalyst activated by UV and visible lights are applied for VOC degradation. This review tries to investigate the state-of-art of recently published papers on this subject with a focus on the high-efficiency photocatalyst. The novel photocatalysts are introduced and enhancing photocatalytic activity strategies such as the hybrid of two/three photocatalyst, impurity doping, and heterojunctions with narrow bandgap semiconductors have been explained. The procedures of visible light activation of the photocatalysts are discussed with attention to current problems and future challenges. In addition, effective operational parameters in the photocatalytic degradation of VOCs have been reviewed with their advantages and drawbacks. A series of strategies are developed for the efficient utilization of visible light photocatalysts and improving new materials or design structures to degrade produced toxic intermediates/by-products during photocatalytic degradation of VOCs. This review shows that there are significant challenges in the applications of photocatalysts in the selective removal of VOCs. Several approaches should be combined to produce synergistic effects, which may lead to much higher photocatalytic performance than individual strategies. Another challenge is to develop efficient photocatalysts to meet real problems on an industrial scale.
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Affiliation(s)
- Soudeh Almaie
- Applied Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, Iran
| | - Vahid Vatanpour
- Department of Applied Chemistry, Faculty of Chemistry, Kharazmi University, Tehran, 15719-14911, Iran; National Research Center on Membrane Technologies, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey; Environmental Engineering Department, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey.
| | - Mohammad Hossein Rasoulifard
- Applied Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, Iran.
| | - Ismail Koyuncu
- National Research Center on Membrane Technologies, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey; Environmental Engineering Department, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
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Degradation of gaseous volatile organic compounds (VOCs) by a novel UV-ozone technology. Sci Rep 2022; 12:11112. [PMID: 35773444 PMCID: PMC9247106 DOI: 10.1038/s41598-022-14191-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 06/02/2022] [Indexed: 11/24/2022] Open
Abstract
In this study, a UV-assisted ozonation (UV/O3) process for the degradation of VOCs emissions with a final scrubbing phase was implemented to evaluate the removal efficiency of toluene and to prevent the release of polluting intermediates of the single-step process. Inlet toluene concentration and applied voltage were varied in order to investigate several operating conditions. The results highlighted that at higher inlet concentration the abatement of toluene was lower, while increase in ozone concentration led to an increase of the degradation efficiencies. The additional water scrubbing step enhanced the abatement of UV/O3 up to 98.5%, due to the solubilisation of ozone and by-products in the process water and, thus, the further oxidation of the contaminants within this phase. A maximum Elimination Capacity (ECmax) of 22.6 g m−3 h−1 was achieved with the UV/O3 + Scrubbing. The combined system boosted higher performance and stability compared to the stand-alone (UV/O3) process along with a more economical and environmental sustainability.
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Prakruthi K, Ujwal MP, Yashas SR, Mahesh B, Kumara Swamy N, Shivaraju HP. Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:4930-4957. [PMID: 34797548 DOI: 10.1007/s11356-021-17361-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 10/31/2021] [Indexed: 06/13/2023]
Abstract
Many untreated and partly treated wastewater from the home and commercial resources is being discharged into the aquatic environment these days, which contains numerous unknown and complex natural and inorganic compounds. These compounds tend to persist, initiating severe environmental problems, which affect human health. Conventionally, physicochemical treatment methods were adopted to remove such complex organic chemicals, but they suffer from critical limitations. Over time, photocatalysis, an advanced oxidation process, has gained its position for its efficient and fair performance against emerging organic pollutant decontamination. Typically, photocatalysis is a green technology to decompose organics under UV/visible light at ambient conditions. Semiconducting nanometal oxides have emerged as pioneering photocatalysts because of large active surface sites, flexible oxidation states, various morphologies, and easy preparation. The current review presents an overview of emerging organic pollutants and their effects, advanced oxidation processes, photocatalytic mechanism, types of photocatalysts, photocatalyst support materials, and methods for improving photodegradation efficiency on the degradation of complex emerging organic pollutants. In addition, the recent reports of metal-oxide-driven photocatalytic remediation of emerging organic pollutants are presented in brief. This review is anticipated to reach a broader scientific community to understand the first principles of photocatalysis and review the recent advancements in this field.
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Affiliation(s)
- Komargoud Prakruthi
- Department of Environmental Engineering, JSS Science and Technology University, Mysuru , 570006, India
| | | | - Shivamurthy Ravindra Yashas
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India
| | - Basavaraju Mahesh
- Department of Chemistry, JSS Academy of Technical Education, Dr. Vishnuvardhan Road, Bengaluru, 560060, India
| | - Ningappa Kumara Swamy
- Department of Chemistry, JSS Science and Technology University, Mysuru, 570006, India.
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13
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Shojaei A, Ghafourian H, Yadegarian L, Lari K, Sadatipour MT. Removal of volatile organic compounds (VOCs) from waste air stream using ozone assisted zinc oxide (ZnO) nanoparticles coated on zeolite. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2021; 19:771-780. [PMID: 34150272 PMCID: PMC8172696 DOI: 10.1007/s40201-021-00644-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 03/01/2021] [Indexed: 05/25/2023]
Abstract
The release of volatile organic compounds (VOCs) from stationary and mobile sources increases the concentration of these pollutants in the environment. These compounds have the potential to cause adverse effects on human health and the environment. The adoption of management and engineering procedures to control the emission of these pollutants to the air has become essential. The aim of this study was to use an advanced oxidation process namely the catalytic ozonation to reduce the concentration of these pollutants in industrial output. In this experimental study, the catalytic ozonation process in the presence of ZnO nanoparticles coated on zeolite media was used in a laboratory scale to treat the air contaminated with BTEX compounds as indicators of VOCs. For this purpose, First the nanocomposites were synthesized based on chemical co-precipitation method. SEM, XRD, BET and FT-IR analyses were performed to investigate the characteristics of nanocomposites. The variables including initial concentrations of BTEX (50-200 ppm), polluted air flow rate (5-20 l/h), humidity (0-75%) and ozone dose (0.25-1 g/h) were investigated. The concentration of BTEX compounds was measured by the Gas Chromatography (GC) technique according to the NIOSH 1501 manual. The results of SEM, XRD, BET and FT-IR analyses showed the proper synthesis of nanocomposites. According to the laboratory results, the optimal conditions of the process were found to be as follows: the initial concentration of pollutants equal to 50 ppm, inlet air flow rate of 5 l/h, relative air humidity of 25-35%, and inlet ozone concentration equal to 1 g/h. Under these conditions, the removal efficiency of the compounds: benzene, toluene, ethylbenzene and xylene were obtained 98, 96, 92 and 91%, respectively. Simple ozonation and adsorption processes were less efficient than catalytic ozonation. This process had the ability to reduce the concentration of BTEX compounds to standard level.
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Affiliation(s)
- Amir Shojaei
- Faculty of Marine Science and Technology, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Hossein Ghafourian
- Faculty of Marine Science and Technology, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Linda Yadegarian
- Faculty of Marine Science and Technology, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Kamran Lari
- Department of Physical Oceanography, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Mohammad Taghi Sadatipour
- Faculty of Marine Science and Technology, North Tehran Branch, Islamic Azad University, Tehran, Iran
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