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Yan S, Liu Q, Liang B, Zhang M, Chen W, Zhang D, Wang C, Xing D. Airborne microbes: sampling, detection, and inactivation. Crit Rev Biotechnol 2024:1-35. [PMID: 39128871 DOI: 10.1080/07388551.2024.2377191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 06/05/2024] [Accepted: 06/08/2024] [Indexed: 08/13/2024]
Abstract
The human living environment serves as a habitat for microorganisms and the presence of ubiquitous airborne microbes significantly impacts the natural material cycle. Through ongoing experimentation with beneficial microorganisms, humans have greatly benefited from airborne microbes. However, airborne pathogens endanger human health and have the potential to induce fatal diseases. Tracking airborne microbes is a critical prerequisite for a better understanding of bioaerosols, harnessing their potential advantages, and mitigating associated risks. Although technological breakthroughs have enabled significant advancements in accurately monitoring airborne pathogens, many puzzles about these microbes remain unanswered due to their high variability and environmental diffusibility. Consequently, advanced techniques and strategies for special identification, early warning, and efficient eradication of microbial contamination are continuously being sought. This review presents a comprehensive overview of the research status of airborne microbes, concentrating on the recent advances and challenges in sampling, detection, and inactivation. Particularly, the fundamental design principles for the collection and timely detection of airborne pathogens are described in detail, as well as critical factors for eliminating microbial contamination and enhancing indoor air quality. In addition, future research directions and perspectives for controlling airborne microbes are also suggested to promote the translation of basic research into real products.
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Affiliation(s)
- Saisai Yan
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Qing Liu
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Bing Liang
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Miao Zhang
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Wujun Chen
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Daijun Zhang
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Chao Wang
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Dongming Xing
- Qingdao Cancer Institute, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
- School of Life Sciences, Tsinghua University, Beijing, China
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2
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Smaiyl M, Tulebekov Y, Nurpeisov N, Satybaldiyev B, Snow DD, Uralbekov B. Human Health Risk Assessment of the Photocatalytic Oxidation of BTEX over TiO 2/Volcanic Glass. Molecules 2023; 28:8119. [PMID: 38138607 PMCID: PMC10745685 DOI: 10.3390/molecules28248119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/01/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
This study demonstrates rapid photocatalytic oxidation of a benzene, toluene, ethylbenzene, and xylene (BTEX) mixture over TiO2/volcanic glass. The assessment of the photocatalytic oxidation of BTEX was conducted under conditions simulating those found in indoor environments affected by aromatic hydrocarbon release. We show, under UV-A intensities of 15 mW/cm2 and an air flow rate of 55 m3/h, that low ppmv levels of BTEX concentrations can be reduced to below detectable levels. Solid-phase microextraction technique was employed to monitor the levels of BTEX in the test chamber throughout the photocatalytic oxidation, lasting approximately 21 h. Destruction of BTEX from the gas phase was observed in the following sequence: o-xylene, ethylbenzene, toluene, and benzene. This study identified sequential degradation of BTEX, in combination with the stringent regulatory level set for benzene, resulted in the air quality hazard indexes (Total Hazard Index and Hazard Quotient) remaining relatively high during the process of photocatalytic oxidation. In the practical application of photocatalytic purification, it is crucial to account for the slower oxidation kinetics of benzene. This is of particular importance due to not only its extremely low exposure limits, but also due to the classification of benzene as a Group 1 carcinogenic compound by the International Agency for Research on Cancer (IARC). Our study underscores the importance of taking regulatory considerations into account when using photocatalytic purification technology.
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Affiliation(s)
- Madi Smaiyl
- Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan; (M.S.); (Y.T.); (N.N.); (B.S.)
| | - Yerzhigit Tulebekov
- Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan; (M.S.); (Y.T.); (N.N.); (B.S.)
| | - Nurbek Nurpeisov
- Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan; (M.S.); (Y.T.); (N.N.); (B.S.)
- LLP «EcoRadSM», Almaty 050000, Kazakhstan
| | - Bagdat Satybaldiyev
- Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan; (M.S.); (Y.T.); (N.N.); (B.S.)
- LLP «EcoRadSM», Almaty 050000, Kazakhstan
| | - Daniel D. Snow
- Water Sciences Laboratory, Nebraska Water Center, Part of the Daugherty Water for Food Global Institute, University of Nebraska, Lincoln, NE 68583, USA;
| | - Bolat Uralbekov
- Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan; (M.S.); (Y.T.); (N.N.); (B.S.)
- LLP «EcoRadSM», Almaty 050000, Kazakhstan
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3
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Ouyang H, Wang L, Sapkota D, Yang M, Morán J, Li L, Olson BA, Schwartz M, Hogan CJ, Torremorell M. Control technologies to prevent aerosol-based disease transmission in animal agriculture production settings: a review of established and emerging approaches. Front Vet Sci 2023; 10:1291312. [PMID: 38033641 PMCID: PMC10682736 DOI: 10.3389/fvets.2023.1291312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 10/26/2023] [Indexed: 12/02/2023] Open
Abstract
Transmission of infectious agents via aerosols is an ever-present concern in animal agriculture production settings, as the aerosol route to disease transmission can lead to difficult-to-control and costly diseases, such as porcine respiratory and reproductive syndrome virus and influenza A virus. It is increasingly necessary to implement control technologies to mitigate aerosol-based disease transmission. Here, we review currently utilized and prospective future aerosol control technologies to collect and potentially inactivate pathogens in aerosols, with an emphasis on technologies that can be incorporated into mechanically driven (forced air) ventilation systems to prevent aerosol-based disease spread from facility to facility. Broadly, we find that control technologies can be grouped into three categories: (1) currently implemented technologies; (2) scaled technologies used in industrial and medical settings; and (3) emerging technologies. Category (1) solely consists of fibrous filter media, which have been demonstrated to reduce the spread of PRRSV between swine production facilities. We review the mechanisms by which filters function and are rated (minimum efficiency reporting values). Category (2) consists of electrostatic precipitators (ESPs), used industrially to collect aerosol particles in higher flow rate systems, and ultraviolet C (UV-C) systems, used in medical settings to inactivate pathogens. Finally, category (3) consists of a variety of technologies, including ionization-based systems, microwaves, and those generating reactive oxygen species, often with the goal of pathogen inactivation in aerosols. As such technologies are typically first tested through varied means at the laboratory scale, we additionally review control technology testing techniques at various stages of development, from laboratory studies to field demonstration, and in doing so, suggest uniform testing and report standards are needed. Testing standards should consider the cost-benefit of implementing the technologies applicable to the livestock species of interest. Finally, we examine economic models for implementing aerosol control technologies, defining the collected infectious particles per unit energy demand.
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Affiliation(s)
- Hui Ouyang
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, United States
- Department of Mechanical Engineering, University of Texas-Dallas, Richardson, TX, United States
| | - Lan Wang
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Deepak Sapkota
- Department of Mechanical Engineering, University of Texas-Dallas, Richardson, TX, United States
| | - My Yang
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
| | - José Morán
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, United States
| | - Li Li
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, United States
| | - Bernard A. Olson
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, United States
| | - Mark Schwartz
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
- Schwartz Farms, Sleepy Eye, MN, United States
| | - Christopher J. Hogan
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, United States
| | - Montserrat Torremorell
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
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4
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Sun X, Li C, Yu B, Wang J, Wang W. Removal of gaseous volatile organic compounds via vacuum ultraviolet photodegradation: Review and prospect. J Environ Sci (China) 2023; 125:427-442. [PMID: 36375926 DOI: 10.1016/j.jes.2022.01.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 01/10/2022] [Accepted: 01/17/2022] [Indexed: 06/16/2023]
Abstract
Volatile organic compounds (VOCs) have attracted much attention for decades as they are the precursors of photochemical smog and are harmful to the environment and human health. Vacuum ultraviolet (VUV) photodegradation is a simple and effective method to decompose VOCs (ranging from tens to hundreds of ppmV) without additional oxidants or catalysts in the air at atmospheric pressure. In this paper, we review the research progress of VOCs removal via VUV photodegradation. The fundamentals are outlined and the key operation factors for VOCs degradation, such as humidity, oxygen content, VOCs initial concentration, light intensity, and flow rate, are discussed. VUV photodegradation of VOCs mixture is elucidated. The application of VUV photodegradation in combination with ozone-assisted catalytic oxidation (OZCO) and photocatalytic oxidation (PCO) systems, and as the pre-treatment technique for biological purification are illustrated. Based on the summary, we propose the challenges of VUV photodegradation and perspectives for its future development.
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Affiliation(s)
- Xue Sun
- School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China
| | - Chaolin Li
- School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Boping Yu
- Shenzhen Academy of Environmental Sciences, Shenzhen 518001, China
| | - Jingwen Wang
- School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China
| | - Wenhui Wang
- School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
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5
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A Novel Application of Photocatalysis: A UV-LED Photocatalytic Device for Controlling Diurnal Evaporative Fuel Vapor Emissions from Automobiles. Catalysts 2022. [DOI: 10.3390/catal13010085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
A novel application of photocatalysis was investigated to reduce diurnal evaporative fuel vapor emissions from automobiles. A light-weight annulus photocatalytic device was designed, fabricated, and characterized for its performance for the oxidation of diurnal evaporative fuel vapor emissions. The prototype photocatalytic device was made with PVC pipe and ultraviolet (λ = 365 nm) light emitting diodes (UV LEDs) as light sources. Commercially available Evonik P25 TiO2 was used as the photocatalyst. The study results demonstrate that the UV LED photocatalytic device is capable of reducing diurnal evaporative fuel vapor emissions from automobiles by 60 wt%. However, the presence of high concentrations of light alkanes and aromatic fuel vapors in the diurnal emissions may limit the longevity of the device due to photocatalyst deactivation. Further development of the idea to enhance the longevity of its performance is recommended.
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6
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Sharma S, Kumar R, Raizada P, Ahamad T, Alshehri SM, Nguyen VH, Thakur S, Nguyen CC, Kim SY, Le QV, Singh P. An overview on recent progress in photocatalytic air purification: Metal-based and metal-free photocatalysis. ENVIRONMENTAL RESEARCH 2022; 214:113995. [PMID: 35932830 DOI: 10.1016/j.envres.2022.113995] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/29/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Air pollution is becoming a distinctly growing concern and the most pressing universal problem as a result of increased energy consumption, with the multiplication of the human population and industrial enterprises, resulting in the generation of hazardous pollutants. Among these, carbon monoxide, nitrogen oxides, Volatile organic compounds, Semi volatile organic compounds, and other inorganic gases not only have an adverse impact on human health both outdoors and indoors, but have also substantially altered the global climate, resulting in several calamities around the world. Thus, the purification of air is a crucial matter to deal with. Photocatalytic oxidation is one of the most recent and promising technologies, and it has been the subject of numerous studies over the past two decades. Hence, the photocatalyst is the most reassuring aspirant due to its adequate bandgap and exquisite stability. The process of photocatalysis has provided many benefits to the atmosphere by removing pollutants. In this review, our work focuses on four main themes. Firstly, we briefly elaborated on the general mechanism of air pollutant degradation, followed by an overview of the typical TiO2 photocatalyst, which is the most researched photocatalyst for photocatalytic destruction of gaseous VOCs. The influence of operating parameters influencing the process of photocatalytic oxidation (such as mass transfer, light source and intensity, pollutant concentration, and relative humidity) was then summarized. Afterwards, the progress and drawbacks of some typical photoreactors (including monolithic reactors, microreactors, optical fiber reactors, and packed bed reactors) were described and differentiated. Lastly, the most noteworthy coverage is dedicated to different types of modification strategies aimed at ameliorating the performance of photocatalysts for degradation of air pollutants, which were proposed and addressed. In addition, the review winds up with a brief deliberation for more exploration into air purification photocatalysis.
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Affiliation(s)
- Sarika Sharma
- School of Advanced Chemical Sciences, Faculty of Basic Sciences, Shoolini University, Solan (HP), 173229, India
| | - Rohit Kumar
- School of Advanced Chemical Sciences, Faculty of Basic Sciences, Shoolini University, Solan (HP), 173229, India
| | - Pankaj Raizada
- School of Advanced Chemical Sciences, Faculty of Basic Sciences, Shoolini University, Solan (HP), 173229, India
| | - Tansir Ahamad
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Saad M Alshehri
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Van-Huy Nguyen
- Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education (CARE), Kelambakkam, Kanchipuram district-603103, Tamil Nadu, India
| | - Sourbh Thakur
- Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Silesian University of Technology, B. Krzywoustego 4, 44-100 Gliwice, Poland
| | - Chinh Chien Nguyen
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; Faculty of Environmental Chemical Engineering, Duy Tan University, Da Nang, 550000, Viet Nam
| | - Soo Young Kim
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Quyet Van Le
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Pardeep Singh
- School of Advanced Chemical Sciences, Faculty of Basic Sciences, Shoolini University, Solan (HP), 173229, India.
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Preparation and Real World Applications of Titania Composite Materials for Photocatalytic Surface, Air, and Water Purification: State of the Art. INORGANICS 2022. [DOI: 10.3390/inorganics10090139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The semiconducting transition metal oxide TiO2 is a rather cheap and non-toxic material with superior photocatalytic properties. TiO2 thin films and nanoparticles are known to have antibacterial, antiviral, antifungal, antialgal, self, water, and air-cleaning properties under UV or sun light irradiation. Based on these excellent qualities, titania holds great promises in various fields of applications. The vast majority of published field and pilot scale studies are dealing with the modification of building materials or generally focus on air purification. Based on the reviewed papers, for the coating of glass, walls, ceilings, streets, tunnels, and other large surfaces, titania is usually applied by spray-coating due to the scalibility and cost-efficiency of this method compared to alternative coating procedures. In contrast, commercialized applications of titania in medical fields or in water purification are rarely found. Moreover, in many realistic test scenarios it becomes evident that the photocatalytic activity is often significantly lower than in laboratory settings. In this review, we will give an overview on the most relevant real world applications and commonly applied preparation methods for these purposes. We will also look at the relevant bottlenecks such as visible light photocatalytic activity and long-term stability and will make suggestions to overcome these hurdles for a widespread usage of titania as photocalyst.
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8
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Metal nanoparticles: biomedical applications and their molecular mechanisms of toxicity. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02351-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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9
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A Review of Selected Types of Indoor Air Purifiers in Terms of Microbial Air Contamination Reduction. ATMOSPHERE 2022. [DOI: 10.3390/atmos13050800] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Aims: With the ongoing pandemic and increased interest in measures to improve indoor air quality, various indoor air purifiers have become very popular and are widely used. This review presents the advantages and disadvantages of various types of technologies used in air purifiers in terms of reducing microbial contamination. Methods: A literature search was performed using Web of Science, Scopus, and PubMed, as well as technical organizations dealing with indoor air-quality to identify research articles and documents within our defined scope of interest. Relevant sections: The available literature data focus mainly on the efficiency of devices based on tests conducted in laboratory conditions with test chambers, which does not reflect the real dimensions and conditions observed in residential areas. According to a wide range of articles on the topic, the actual effectiveness of air purifiers is significantly lower in real conditions than the values declared by the manufacturers in their marketing materials as well as technical specifications. Conclusions: According to current findings, using indoor air purifiers should not be the only measure to improve indoor air-quality; however, these can play a supporting role if their application is preceded by an appropriate technical and environmental analysis considering the real conditions of its use.
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Dong P, Dong F, Fiorenza R. Editorial: Photocatalysts for Air Purification: Design, Synthesis, and Mechanism Investigations. Front Chem 2022; 10:870550. [PMID: 35372258 PMCID: PMC8966393 DOI: 10.3389/fchem.2022.870550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 02/18/2022] [Indexed: 11/18/2022] Open
Affiliation(s)
- Pengyu Dong
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng, China
- *Correspondence: Pengyu Dong, ; Fan Dong, ; Roberto Fiorenza,
| | - Fan Dong
- Research Center for Environmental Science and Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China
- *Correspondence: Pengyu Dong, ; Fan Dong, ; Roberto Fiorenza,
| | - Roberto Fiorenza
- Department of Chemical Sciences, University of Catania, Catania, Italy
- *Correspondence: Pengyu Dong, ; Fan Dong, ; Roberto Fiorenza,
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11
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Nisbet-Jones PBR, Fernandez JM, Fisher RE, France JL, Lowry D, Waltham DA, Woolley Maisch CA, Nisbet EG. Is the destruction or removal of atmospheric methane a worthwhile option? PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2022; 380:20210108. [PMID: 34865528 PMCID: PMC8646139 DOI: 10.1098/rsta.2021.0108] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 08/31/2021] [Indexed: 05/05/2023]
Abstract
Removing methane from the air is possible, but do the costs outweigh the benefits? This note explores the question of whether removing methane from the atmosphere is justifiable. Destruction of methane by oxidation to CO2 eliminates 97% of the warming impact on a 100-yr time scale. Methane can be oxidized by a variety of methods including thermal or ultraviolet photocatalysis and various processes of physical, chemical or biological oxidizers. Each removal method has energy costs (with the risk of causing embedded CO2 emission that cancel the global warming gain), but in specific circumstances, including settings where air with high methane is habitually present, removal may be competitive with direct efforts to cut fugitive methane leaks. In all cases however, great care must be taken to ensure that the destruction has a net positive impact on the total global warming, and that the resources required would not be better used for stopping the methane from being emitted. This article is part of a discussion meeting issue 'Rising methane: is warming feeding warming? (part 2)'.
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Affiliation(s)
| | - Julianne M. Fernandez
- Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
| | - Rebecca E. Fisher
- Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
| | - James L. France
- British Antarctic Survey, Natural Environment Research Council, Cambridge, UK
| | - David Lowry
- Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
| | - David A. Waltham
- Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
| | | | - Euan G. Nisbet
- Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
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12
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Kräuter J, Franz E, Waidhas F, Brummel O, Jörg Libuda, Al-Shamery K. The Role of Defects in the Photoconversion of 2-Propanol on Rutile Titania: Operando Spectroscopy Combined with Elementary Studies. J Catal 2022. [DOI: 10.1016/j.jcat.2021.12.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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13
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Zhou M, Ou H, Li S, Qin X, Fang Y, Lee S, Wang X, Ho W. Photocatalytic Air Purification Using Functional Polymeric Carbon Nitrides. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2102376. [PMID: 34693667 PMCID: PMC8693081 DOI: 10.1002/advs.202102376] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/20/2021] [Indexed: 05/19/2023]
Abstract
The techniques for the production of the environment have received attention because of the increasing air pollution, which results in a negative impact on the living environment of mankind. Over the decades, burgeoning interest in polymeric carbon nitride (PCN) based photocatalysts for heterogeneous catalysis of air pollutants has been witnessed, which is improved by harvesting visible light, layered/defective structures, functional groups, suitable/adjustable band positions, and existing Lewis basic sites. PCN-based photocatalytic air purification can reduce the negative impacts of the emission of air pollutants and convert the undesirable and harmful materials into value-added or nontoxic, or low-toxic chemicals. However, based on previous reports, the systematic summary and analysis of PCN-based photocatalysts in the catalytic elimination of air pollutants have not been reported. The research progress of functional PCN-based composite materials as photocatalysts for the removal of air pollutants is reviewed here. The working mechanisms of each enhancement modification are elucidated and discussed on structures (nanostructure, molecular structue, and composite) regarding their effects on light-absorption/utilization, reactant adsorption, intermediate/product desorption, charge kinetics, and reactive oxygen species production. Perspectives related to further challenges and directions as well as design strategies of PCN-based photocatalysts in the heterogeneous catalysis of air pollutants are also provided.
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Affiliation(s)
- Min Zhou
- Department of Science and Environmental StudiesThe Education University of Hong KongTai Po, New TerritoriesHong KongP. R. China
| | - Honghui Ou
- Department of ChemistryTsinghua UniversityBeijing100084P. R. China
| | - Shanrong Li
- State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou350116P. R. China
| | - Xing Qin
- Department of Science and Environmental StudiesThe Education University of Hong KongTai Po, New TerritoriesHong KongP. R. China
| | - Yuanxing Fang
- State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou350116P. R. China
| | - Shun‐cheng Lee
- Department of Civil and Environmental EngineeringThe Hong Kong Polytechnic UniversityHong KongP. R. China
| | - Xinchen Wang
- State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou350116P. R. China
| | - Wingkei Ho
- Department of Science and Environmental StudiesThe Education University of Hong KongTai Po, New TerritoriesHong KongP. R. China
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14
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Ahmadi Y, Bhardwaj N, Kim KH, Kumar S. Recent advances in photocatalytic removal of airborne pathogens in air. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 794:148477. [PMID: 34198079 DOI: 10.1016/j.scitotenv.2021.148477] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 05/31/2021] [Accepted: 06/11/2021] [Indexed: 06/13/2023]
Abstract
The abatement of airborne pathogens such as bacteria, viruses, and fungi has become an important goal of air-quality management. Efficient and effective treatment techniques such as photocatalysis are essential for disinfection of airborne microorganisms. This review focuses on recent advances in the formulation and development of photocatalytic disinfection, design of efficient photocatalysts, choice of photocatalytic reactor, removal and/or disinfection mechanisms, and the role of reactive ion species. Data from recent studies are analyzed to accurately assess the efficacy of such disinfection approaches. This review also highlights the application of innovative materials in individual and combined abatement systems against airborne bacterial, viral, and fungal pathogens. We discuss the efficiency and benefits presented by such systems, address the challenges, and provide a perspective for future research.
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Affiliation(s)
- Younes Ahmadi
- Department of Analytical Chemistry, Kabul University, Kabul 1001, Afghanistan
| | - Neha Bhardwaj
- Department of Biotechnology, University Institute of Engineering Technology (UIET), Panjab University, Chandigarh, India
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
| | - Sandeep Kumar
- Department of Bio and Nano Technology, Guru Jambheshwar University of Science and Technology, Hisar, Haryana 125001, India.
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Abstract
Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research–practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.
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16
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Jeong H, Lee J. Ag/AgCl nanoparticles embedded in porous TiO 2: defect formation triggered by light irradiation. NEW J CHEM 2021. [DOI: 10.1039/d1nj01419f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photocatalytic activity of Ag/AgCl embedded in defective porous TiO2 was dependent on the changes of Ti3+ and the formation of AgCl crystals.
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Affiliation(s)
| | - Junhyung Lee
- ECA, Korea Advanced Nano Fab Center
- Suwon-si
- Korea
- Department of Materials Science and Engineering
- Seoul National University
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17
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Graml A, König B. Synthesis of anti‐Markovnikov Alcohols via Epoxidation and Hydrogenation of Styrenes using Photocatalytically Generated Redox Equivalents. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Andreas Graml
- Department of Chemistry and Pharmacy Institute of Organic Chemistry University of Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Burkhard König
- Department of Chemistry and Pharmacy Institute of Organic Chemistry University of Regensburg Universitätsstraße 31 93053 Regensburg Germany
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18
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Martínez-Montelongo JH, Medina-Ramírez IE, Romo-Lozano Y, Zapien JA. Development of a sustainable photocatalytic process for air purification. CHEMOSPHERE 2020; 257:127236. [PMID: 32512333 DOI: 10.1016/j.chemosphere.2020.127236] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 06/11/2023]
Abstract
Nowadays, air pollution has become a global menace being responsible of a significant increase on the morbidity and mortality of human beings. In view of this, sustainable and efficient technologies for air purification are being sought. Air purification by photocatalytic treatment has received a lot of attention due to the unspecific and high oxidation capacity of the catalyst; however still some variables must be optimized to assure practical applications. In this work, visible light active TiO2-Cu2+@perlite and Ag@TiO2-Cu2+/perlite supported materials were fabricated. TiO2-Cu2+ (2 at. %) were synthesized using a sol-gel procedure followed of the impregnation of the support by immersion. For Ag@TiO2-Cu2+, silver deposition was conducted by chemical reduction using sodium citrate and sodium borohydride. The materials (powders and supported materials) were characterized by Scanning Electron Microscopy (SEM) to demonstrate their small size and adherence to the substrate. A prototype of a photocatalytic air purifier was built. The efficacy of the prototype was evaluated for the disinfection of indoor air (dentistry clinics). The photo-catalyst was activated using visible and UVA low-cost high-energy LEDs. The antibacterial activity of the air filter was evaluated. Ag@TiO2-Cu2+ exerts better air disinfection activity at lower doses in comparison to TiO2-Cu2+. Bacterial growth inhibitions up to 99% were achieved for both, Gram-negative and Gram-positive bacteria. The incorporation of Ag and Cu to TiO2 improves the antibacterial activity of the materials due to enhanced photocatalytic activity and the synergic activity of TiO2 and dopant elements (Ag, Cu) to inhibit microorganism's growth.
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Affiliation(s)
- Jorge H Martínez-Montelongo
- Chemistry Department. Universidad Autónoma de Aguascalientes. Av. Universidad 940, Aguascalientes, Ags, Mexico
| | - Iliana E Medina-Ramírez
- Chemistry Department. Universidad Autónoma de Aguascalientes. Av. Universidad 940, Aguascalientes, Ags, Mexico.
| | | | - Juan Antonio Zapien
- Department of Materials Science and Engineering. City University of Hong Kong, Hong Kong SAR, PR China
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19
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Maddela NR, Venkateswarlu K, Megharaj M. Tris(2-chloroethyl) phosphate, a pervasive flame retardant: critical perspective on its emissions into the environment and human toxicity. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2020; 22:1809-1827. [PMID: 32760963 DOI: 10.1039/d0em00222d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Regulations and the voluntary activities of manufacturers have led to a market shift in the use of flame retardants (FRs). Accordingly, organophosphate ester flame retardants (OPFRs) have emerged as a replacement for polybrominated diphenyl ethers (PBDEs). One of the widely used OPFRs is tris(2-chloroethyl) phosphate (TCEP), the considerable usage of which has reached 1.0 Mt globally. High concentrations of TCEP in indoor dust (∼2.0 × 105 ng g-1), its detection in nearly all foodstuffs (max. concentration of ∼30-300 ng g-1 or ng L-1), human body burden, and toxicological properties as revealed by meta-analysis make TCEP hard to distinguish from traditional FRs, and this situation requires researchers to rethink whether or not TCEP is an appropriate choice as a new FR. However, there are many unresolved issues, which may impede global health agencies in framing stringent regulations and manufacturers considering the meticulous use of TCEP. Therefore, the aim of the present review is to highlight the factors that influence TCEP emissions from its sources, its bioaccessibility, threat of trophic transfer, and toxicogenomics in order to provide better insight into its emergence as an FR. Finally, remediation strategies for dealing with TCEP emissions, and future research directions are addressed.
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Affiliation(s)
- Naga Raju Maddela
- Instituto de Investigación, Universidad Técnica de Manabí, Portoviejo, 130105, Ecuador and Facultad la Ciencias la Salud, Universidad Técnica de Manabí, Portoviejo, 130105, Ecuador
| | - Kadiyala Venkateswarlu
- Formerly Department of Microbiology, Sri Krishnadevaraya University, Anantapuramu 515003, India
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation (GCER), Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Faculty of Science, The University of Newcastle, ATC Building, University Drive, Callaghan, NSW 2308, Australia.
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20
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Enhanced Visible and Ultraviolet Light-Induced Gas-Phase Photocatalytic Activity of TiO2 Thin Films Modified by Increased Amount of Acetylacetone in Precursor Solution for Spray Pyrolysis. Catalysts 2020. [DOI: 10.3390/catal10091011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
TiO2 thin films, modified by acetylacetone (AcacH) in solution, were deposited on glass substrate by ultrasonic spray pyrolysis and tested for photocatalytic activity in a multi-section continuous flow reactor by degradation of acetone and acetaldehyde under ultraviolet and visible light. The increase in molar ratio of AcacH in respect of titanium (IV) isopropoxide (TTIP) from 1:5 to 1:8 modified the electronic structure of the films, favoring enhanced photocatalytic activity. The photocatalytic activity was enhanced approximately twofold on the film with molar ratio 1:8 under both irradiations; the film completely oxidized 10 ppm of acetone and acetaldehyde. The photocatalytic efficacy of TiO2 films in oxidation of air pollutants was three times higher compared to the industrial glass Pilkington ActivTM. Moreover, all the synthesized films indicate antibacterial efficiency against E. coli of over 99% under ultraviolet. TiO2 film, with TTIP:AcacH molar ratio 1:8 having great possibility for its commercial use as a material for indoor air purification.
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21
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Zhang Y, Xu X. Machine Learning Band Gaps of Doped-TiO 2 Photocatalysts from Structural and Morphological Parameters. ACS OMEGA 2020; 5:15344-15352. [PMID: 32637808 PMCID: PMC7331044 DOI: 10.1021/acsomega.0c01438] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 06/08/2020] [Indexed: 05/09/2023]
Abstract
Titanium dioxide (TiO2) photocatalysts in the form of thin films are of great interest due to their tunable optical band gaps, E g's, which are promising candidates for applications of visible-light photocatalytic activities. Previous studies have shown that processing conditions, dopant types and concentrations, and different combinations of the two have great impacts on structural, microscopic, and optical properties of TiO2 thin films. The lattice parameters and surface area are strongly correlated with E g values, which are conventionally simulated and studied through first-principle models, but these models require significant computational resources, particularly in complex situations involving codoping and various surface areas. In this study, we develop the Gaussian process regression model for predictions of anatase TiO2 photocatalysts' energy band gaps based on the lattice parameters and surface area. We explore 60 doped-TiO2 anatase photocatalysts with E g's between 2.280 and 3.250 eV. Our model demonstrates a high correlation coefficient of 99.99% between predicted E g's and their experimental values and high prediction accuracy as reflected through the prediction root-mean-square error and mean absolute error being 0.0012 and 0.0010% of the average experimental E g, respectively. This modeling method is simple and straightforward and does not require a lot of parameters, which are advantages for applications and computations.
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22
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Photocatalytic Composite Nanomaterial and Engineering Solution for Inactivation of Airborne Bacteria. Top Catal 2020. [DOI: 10.1007/s11244-020-01291-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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23
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Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water. Catalysts 2020. [DOI: 10.3390/catal10040452] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The purpose of the study was to effectively treat algae bloomed water while using a Ti-based coagulant (TiCl4) and recover photoactive novel anatase TiO2 from the flocculated sludge. Conventional jar tests were conducted in order to evaluate the coagulation efficiency, and TiCl4 was found superior compared to commercially available poly aluminum chloride (PAC). At a dose of 0.3 g Ti/L, the removal rate of turbidity, chemical oxygen demand (COD), and total phosphorus (TP) were measured as 99.8%, 66.7%, and 96.9%, respectively. Besides, TiO2 nanoparticles (NPs) were recovered from the flocculated sludge and scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and X-ray diffraction (XRD) analysis confirmed the presence of only anatase phase. The recovered TiO2 was found to be effective in removing gaseous CH3CHO and NOx under UV-A lamp at a light intensity of 10 W/m2. Additionally, the TiO2 mixed mortar blocks that were prepared in this study successfully removed atmospheric nitrogen oxide (NOx) under UV irradiance. This study is one of the first to prepare anatase TiO2 from flocculated algal sludge and it showed promising results. Further research on this novel TiO2 concerning internal chemical bonds and shift in the absorbance spectrum could explore several practical implications.
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24
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Roongraung K, Chuangchote S, Laosiripojana N, Sagawa T. Electrospun Ag-TiO 2 Nanofibers for Photocatalytic Glucose Conversion to High-Value Chemicals. ACS OMEGA 2020; 5:5862-5872. [PMID: 32226866 PMCID: PMC7098020 DOI: 10.1021/acsomega.9b04076] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Accepted: 02/24/2020] [Indexed: 05/30/2023]
Abstract
TiO2 nanofibers were fabricated by combination of sol-gel and electrospinning techniques. Ag-doped TiO2 nanofibers with different Ag contents were prepared by two different methods (in situ electrospinning or wetness impregnation of Ag on TiO2 nanofibers) and heat treated at 500 °C for 2 h under an air or N2 atmosphere. The obtained catalysts were characterized by field emission scanning electron microscopy, X-ray diffraction, photoluminescence, and N2 adsorption analyzed by the Brunauer-Emmett-Teller (BET) method. Photocatalytic glucose conversions with electrospun TiO2 and Ag-doped TiO2 nanofibers for production of high-value products were carried out. From different doping methods, the results indicated that 1 wt % Ag-TiO2 nanofibers prepared by an in situ method with calcination under N2 achieved the highest glucose conversion (85.49%). From several Ag loading contents (i.e., 0, 1, 2, and 4 wt %) in Ag-doped TiO2 nanofibers, the nanofibers exhibited different glucose conversions [in order of 2 wt % (99.65%) > 1 wt % (85.49%) > 4 wt % (77.72%) > 0 wt % (29.64%)]. Arabinose, xylitol, gluconic acid, and formic acid were found as the high-value chemicals with the photocatalytic reaction of TiO2 and Ag-doped TiO2 nanofibers under UVA irradiation. Product yields of each converted chemicals from different photocatalysts from different Ag loading contents showed relatively same trends with the glucose conversion. From all results, it can be concluded that the good characteristics of 2 wt % Ag-TiO2 nanofibers such as the smallest anatase crystallite size (8.25 nm) and the highest specific surface area (S BET = 53.69 m2/g) promoted the highest photocatalytic activity. Additionally, TiO2 and Ag-doped TiO2 nanofibers exhibited higher photocatalytic performance for glucose conversion than commercial TiO2 (P25) and synthesized TiO2 nanoparticles. Finally, Ag-doped TiO2 nanofibers showed recycling ability with high photocatalytic glucose conversion after four-time use.
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Affiliation(s)
- Kamonchanok Roongraung
- The Joint Graduate
School of Energy and Environment, King Mongkut’s University of Technology
Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok 10140, Thailand
- Center
for Energy Technology and Environment, Ministry
of Education, 126 Prachauthit
Rd., Bangmod, Thungkru, Bangkok 10140, Thailand
| | - Surawut Chuangchote
- Department of Tool
and Materials Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok 10140, Thailand
- Research Center for Advanced Materials
for Energy and Environmental Technology (MEET), King Mongkut’s University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok 10140, Thailand
| | - Navadol Laosiripojana
- The Joint Graduate
School of Energy and Environment, King Mongkut’s University of Technology
Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok 10140, Thailand
- Center
for Energy Technology and Environment, Ministry
of Education, 126 Prachauthit
Rd., Bangmod, Thungkru, Bangkok 10140, Thailand
| | - Takashi Sagawa
- Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
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25
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Zhang L, Moralejo C, Anderson WA. A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO
2
‐based catalysts. CAN J CHEM ENG 2019. [DOI: 10.1002/cjce.23652] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Lianfeng Zhang
- Department of Chemical EngineeringUniversity of Waterloo Waterloo Ontario Canada
- Laboratory of Ecological and Environmental ProtectionResearch Institute of Tsinghua University in Shenzhen Shenzhen China
| | - Carol Moralejo
- Department of Chemical EngineeringUniversity of Waterloo Waterloo Ontario Canada
| | - William A. Anderson
- Department of Chemical EngineeringUniversity of Waterloo Waterloo Ontario Canada
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26
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Marcelino RBP, Amorim CC. Towards visible-light photocatalysis for environmental applications: band-gap engineering versus photons absorption-a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:4155-4170. [PMID: 30238261 DOI: 10.1007/s11356-018-3117-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 08/31/2018] [Indexed: 06/08/2023]
Abstract
A range of different studies has been performed in order to design and develop photocatalysts that work efficiently under visible (and near-infrared) irradiation as well as to improve photons absorption with improved reactor design. While there is consensus on the importance of photocatalysis for environmental applications and the necessity to utilized solar irradiation (or visible-light) as driving force for these processes, it is not yet clear how to get there. Discussion on the future steps towards visible-light photocatalysis for environmental application is of great interest to scientific and industrial communities and the present paper reviews and discusses the two main approaches, band-gap engineering for efficient solar-activated catalysts and reactor designs for improved photons absorption. Common misconceptions and drawbacks of each technology are also examined together with insights for future progress.
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Affiliation(s)
- Rafaela B P Marcelino
- Research Group on Environmental Applications of Advanced Oxidation Processes, Graduate Program in Sanitation, Environment and Water Resources, School of Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, 31270-901, Belo Horizonte, Brazil
| | - Camila C Amorim
- Research Group on Environmental Applications of Advanced Oxidation Processes, Graduate Program in Sanitation, Environment and Water Resources, School of Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, 31270-901, Belo Horizonte, Brazil.
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27
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Wei Z, Janczarek M, Endo M, Wang K, Balčytis A, Nitta A, Méndez-Medrano MG, Colbeau-Justin C, Juodkazis S, Ohtani B, Kowalska E. Noble metal-modified faceted anatase titania photocatalysts: Octahedron versus decahedron. APPLIED CATALYSIS. B, ENVIRONMENTAL 2018; 237:574-587. [PMID: 30532348 PMCID: PMC6100264 DOI: 10.1016/j.apcatb.2018.06.027] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 06/03/2018] [Accepted: 06/09/2018] [Indexed: 05/23/2023]
Abstract
Octahedral anatase particles (OAP, with eight equivalent {101} facets) and decahedral anatase particles (DAP, with two additional {001} facets) were modified with nanoparticles of noble metals (Au, Ag, Cu). The titania morphology, expressed by the presence of different arrangements of exposed crystal facets, played a key role in the photocatalytic properties of metal-modified faceted titania. In the UV/vis systems, two-faceted configuration of DAP was more favorable for the reaction efficiency than single-faceted OAP because of an efficient charge separation described by the transfer of electrons to {101} facets and holes to {001} facets. Time-resolved microwave conductivity (TRMC) and reversed double-beam photoacoustic spectroscopy (RDB-PAS) confirmed that distribution of electron traps (ET) and mobility of electrons were key-factors of photocatalytic activity. In contrast, metal-modified OAP samples had higher photocatalytic activity than metal-modified DAP and metal-modified commercial titania samples under visible light irradiation. This indicates that the presence of single type of facets ({101}) is favorable for efficient electron transfer via shallow ET, whereas intrinsic properties of DAP result in fast charge carriers' recombination when gold is deposited on {101} facets (migration of "hot" electrons: Au→{101}→Au).
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Affiliation(s)
- Zhishun Wei
- Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan, 430068, China
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
| | - Marcin Janczarek
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
- Department of Chemical Technology, Gdansk University of Technology, G. Narutowicza 11/12, 80-233, Gdansk, Poland
| | - Maya Endo
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
| | - Kunlei Wang
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
| | - Armandas Balčytis
- Center for Micro-Photonics, Swinburne University of Technology, John St., Hawthorn, 3122 Vic, Australia
| | - Akio Nitta
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
| | - Maria G. Méndez-Medrano
- Laboratory of Physical Chemistry, UMR 8000, University of Paris-Saclay, 91405, Orsay, France
| | | | - Saulius Juodkazis
- Center for Micro-Photonics, Swinburne University of Technology, John St., Hawthorn, 3122 Vic, Australia
| | - Bunsho Ohtani
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
| | - Ewa Kowalska
- Institute for Catalysis, Hokkaido University, N21, W8, 001-0021, Sapporo, Japan
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28
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Sun Z, Kang IS, Wu Q, Xi J, Hu H. Biotoxicity of Water-Soluble UV Photodegradation Products for 10 Typical Gaseous VOCs. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15071520. [PMID: 30021988 PMCID: PMC6069044 DOI: 10.3390/ijerph15071520] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 07/11/2018] [Accepted: 07/16/2018] [Indexed: 11/16/2022]
Abstract
Ultraviolet (UV) photodegradation is increasingly applied to control volatile organic compounds (VOCs) due to its degradation capabilities for recalcitrant compounds. However, sometimes the UV photodegradation products are also toxic and can affect human health. Here, 10 VOCs at 150~200 ppm in air were treated using a laboratory-scale UV reactor with 185/254 nm irradiation, and the biotoxicity of their off-gas was studied by investigating their off-gas absorption solutions. The CO2 increase and VOC decrease were 39~128 ppm and 0~42 ppm, respectively, indicating that the VOCs and their products were mineralized in off-gas absorption solutions. The total organic carbon (TOC) of the absorption solutions are 4~20 mg∙L−1. Luminescent bacteria and Daphnia magna were used to detect the acute toxicity, and an umu assay was used to determine the genotoxic potential. Trichloroethylene showed a highest toxicity to luminescent bacteria, while chlorobenzene had the lowest toxicity. Water-soluble UV photodegradation products for styrene are very toxic to Daphnia magna. In the umu assay, the genotoxicities of off-gas absorption solutions of trichloroethylene, methylbenzene, ethyl acetate, butyl alcohol, and styrene were 51.26, 77.80, 86.89, 97.20, and 273.62 mg (4-NQO)·L−1 respectively. In addition, the analysis of the genotoxicity/TOC and intermediates products indicated that the off-gas absorption solutions of styrene, trichloroethylene, and butyl alcohol contain many highly toxic substances.
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Affiliation(s)
- Zhuqiu Sun
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China.
| | - In-Sun Kang
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China.
| | - Qianyuan Wu
- State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Jinying Xi
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China.
- State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Hongying Hu
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China.
- State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
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29
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Li J, Wang Y, Tian Y, He X, Yang P, Yuan M, Cao Y, Lyu J. Crystallization of microporous TiO 2 through photochemical deposition of Pt for photocatalytic degradation of volatile organic compounds. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:15662-15670. [PMID: 29574642 DOI: 10.1007/s11356-018-1767-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 03/13/2018] [Indexed: 06/08/2023]
Abstract
The photocatalytic mineralization efficiency of volatile organic compounds (VOCs) is determined by adsorption of reactants, separation of charge carriers, and reaction activity of catalyst surface. Herein, we provide a strategy to synthesize a novel catalyst, namely, PhPt-Micro, which is characterized by high adsorption ability, charge separation efficiency, and surface reaction activity. Toluene was chosen as the model VOC. The effects of photochemical deposition of Pt on the physical properties of microporous amorphous TiO2 (Micro) and toluene mineralization were studied using N2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) analyses. After photochemical treatment, the structure of Micro was optimized, and Pt nanoparticles were successfully deposited at the outlet of electrons on the catalyst surface. SPS result proved that the optimized structure enhanced the separation efficiency of charge carriers and the migration of photo-generated electrons to the PhPt-Micro surface. The quasi-equilibrium adsorption amount of toluene over PhPt-Micro was two times higher than that with commercial nano TiO2 (P25). The micropores concentrated toluene on the catalyst surface and hindered intermediate desorption. The mineralization efficiency of toluene over PhPt-Micro was 2.4 and 5.9 times higher than those over Micro and P25, respectively.
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Affiliation(s)
- Ji Li
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Yanhong Wang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Yiyuan Tian
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Xuan He
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Pingping Yang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Minghui Yuan
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Yuqing Cao
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Jinze Lyu
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China.
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China.
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30
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Kumpanenko IV, Roschin AV, Ivanova NA, Zelenina EI, Volchenko TC, Panin EO. Heterogeneous Photocatalytic Oxidation of Pollutants in Air on TiO2 Particles. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2018. [DOI: 10.1134/s1990793118010220] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems. Catalysts 2017. [DOI: 10.3390/catal7110317] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation. Molecules 2017; 22:molecules22060945. [PMID: 28590427 PMCID: PMC6152651 DOI: 10.3390/molecules22060945] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 05/31/2017] [Indexed: 11/17/2022] Open
Abstract
An integral reactor design methodology was developed to address the optimal design of photocatalytic wall reactors to be used in air pollution control. For a target pollutant to be eliminated from an air stream, the proposed methodology is initiated with a mechanistic derived reaction rate. The determination of intrinsic kinetic parameters is associated with the use of a simple geometry laboratory scale reactor, operation under kinetic control and a uniform incident radiation flux, which allows computing the local superficial rate of photon absorption. Thus, a simple model can describe the mass balance and a solution may be obtained. The kinetic parameters may be estimated by the combination of the mathematical model and the experimental results. The validated intrinsic kinetics obtained may be directly used in the scaling-up of any reactor configuration and size. The bench scale reactor may require the use of complex computational software to obtain the fields of velocity, radiation absorption and species concentration. The complete methodology was successfully applied to the elimination of airborne formaldehyde. The kinetic parameters were determined in a flat plate reactor, whilst a bench scale corrugated wall reactor was used to illustrate the scaling-up methodology. In addition, an optimal folding angle of the corrugated reactor was found using computational fluid dynamics tools.
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Costarramone N, Cantau C, Desauziers V, Pécheyran C, Pigot T, Lacombe S. Photocatalytic air purifiers for indoor air: European standard and pilot room experiments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:12538-12546. [PMID: 27628923 DOI: 10.1007/s11356-016-7607-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 09/05/2016] [Indexed: 06/06/2023]
Abstract
At the European level (CEN/TC386), some efforts are currently devoted to new standards for comparing the efficiency of commercial photocatalytic material/devices in various application fields. Concerning prototype or commercial indoor photocatalytic air purifiers designed for volatile organic compounds (VOC) abatement, the methodology is based on a laboratory airtight chamber. The photocatalytic function is demonstrated by the mineralization of a mixture of five VOCs. Experimental data were obtained for four selected commercial devices and three commercial materials: drop of VOC concentration, but also identification of secondary species (with special attention to formaldehyde), mineralization rates, and Clean Air Delivery Rate (CADR). With two efficient air purifiers, these laboratory experiments were compared to the results in two experimental rooms (35-40 m3) where air pollution was introduced through wooden floor and furniture. The systems' ageing was also studied. The safety of the commercial products was also assessed by the determination of nanoparticle release. Standardized tests are useful to rank photocatalytic air purifiers and passive materials and to discard inefficient ones. A good correlation between the standard experiments and the experimental room experiments was found, even if in the latter case, the concentration of lower weight VOCs drops less quickly than that of heavier VOCs.
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Affiliation(s)
- N Costarramone
- UT2A, Hélioparc, 2 Avenue du Président Angot, BP 1153, 64013, Pau cedex, France
- IPREM, UMR CNRS 5254, Université de Pau et Pays de l'Adour Hélioparc, 2 Av. Pdt Angot, BP 1153, 64013, Pau cedex, France
| | - C Cantau
- NOBATEK, 67 rue de Mirambeau, 64600, Anglet, France
| | - V Desauziers
- C2MA Ecole des Mines d'Alès, Hélioparc, 2 Av. Pdt Angot, BP 1153, 64013, Pau cedex, France
| | - C Pécheyran
- IPREM, UMR CNRS 5254, Université de Pau et Pays de l'Adour Hélioparc, 2 Av. Pdt Angot, BP 1153, 64013, Pau cedex, France
| | - T Pigot
- IPREM, UMR CNRS 5254, Université de Pau et Pays de l'Adour Hélioparc, 2 Av. Pdt Angot, BP 1153, 64013, Pau cedex, France
| | - S Lacombe
- IPREM, UMR CNRS 5254, Université de Pau et Pays de l'Adour Hélioparc, 2 Av. Pdt Angot, BP 1153, 64013, Pau cedex, France.
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Photocatalytic and Photochemical Oxidation of Ethylene: Potential for Storage of Fresh Produce—a Review. FOOD BIOPROCESS TECH 2017. [DOI: 10.1007/s11947-017-1889-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Weon S, Choi W. TiO2 Nanotubes with Open Channels as Deactivation-Resistant Photocatalyst for the Degradation of Volatile Organic Compounds. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:2556-2563. [PMID: 26854616 DOI: 10.1021/acs.est.5b05418] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We synthesized ordered TiO2 nanotubes (TNT) and compared their photocatalytic activity with that of TiO2 nanoparticles (TNP) film during the repeated cycles of photocatalytic degradation of gaseous toluene and acetaldehyde to test the durability of TNT as an air-purifying photocatalyst. The photocatalytic activity of TNT showed only moderate reduction after the five cycles of toluene degradation, whereas TNP underwent rapid deactivation as the photocatalysis cycles were repeated. Dynamic SIMS analysis showed that carbonaceous deposits were formed on the surface of TNP during the photocatalytic degradation of toluene, which implies that the photocatalyst deactivation should be ascribed to the accumulation of recalcitrant degradation intermediates (carbonaceous residues). In more oxidizing atmosphere (100% O2 under which less carbonaceous residues should form), the photocatalytic activity of TNP still decreased with repeating cycles of toluene degradation, whereas TNT showed no sign of deactivation. Because TNT has a highly ordered open channel structure, O2 molecules can be more easily supplied to the active sites with less mass transfer limitation, which subsequently hinders the accumulation of carbonaceous residues on TNT surface. Contrary to the case of toluene degradation, both TNT and TNP did not exhibit any significant deactivation during the photocatalytic degradation of acetaldehyde, because the generation of recalcitrant intermediates from acetaldehyde degradation is insignificant. The structural characteristics of TNT is highly advantageous in preventing the catalyst deactivation during the photocatalytic degradation of aromatic compounds.
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Affiliation(s)
- Seunghyun Weon
- School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 790-784, Korea
| | - Wonyong Choi
- School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 790-784, Korea
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Deposition of Visible Light Active Photocatalytic Bismuth Molybdate Thin Films by Reactive Magnetron Sputtering. MATERIALS 2016; 9:ma9020067. [PMID: 28787867 PMCID: PMC5456504 DOI: 10.3390/ma9020067] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 01/13/2016] [Accepted: 01/15/2016] [Indexed: 01/27/2023]
Abstract
Bismuth molybdate thin films were deposited by reactive magnetron co-sputtering from two metallic targets in an argon/oxygen atmosphere, reportedly for the first time. Energy dispersive X-ray spectroscopy (EDX) analysis showed that the ratio of bismuth to molybdenum in the coatings can be effectively controlled by varying the power applied to each target. Deposited coatings were annealed in air at 673 K for 30 min. The crystalline structure was assessed by means of Raman spectroscopy and X-ray diffraction (XRD). Oxidation state information was obtained by X-ray photoelectron spectroscopy (XPS). Photodegradation of organic dyes methylene blue and rhodamine B was used for evaluation of the photocatalytic properties of the coatings under a visible light source. The photocatalytic properties of the deposited coatings were then compared to a sample of commercial titanium dioxide-based photocatalytic product. The repeatability of the dye degradation reactions and photocatalytic coating reusability are discussed. It was found that coatings with a Bi:Mo ratio of approximately 2:1 exhibited the highest photocatalytic activity of the coatings studied; its efficacy in dye photodegradation significantly outperformed a sample of commercial photocatalytic coating.
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Removal of Indoor Volatile Organic Compounds via Photocatalytic Oxidation: A Short Review and Prospect. Molecules 2016; 21:56. [PMID: 26742024 PMCID: PMC6273848 DOI: 10.3390/molecules21010056] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 12/27/2015] [Accepted: 12/28/2015] [Indexed: 01/07/2023] Open
Abstract
Volatile organic compounds (VOCs) are ubiquitous in indoor environments. Inhalation of VOCs can cause irritation, difficulty breathing, and nausea, and damage the central nervous system as well as other organs. Formaldehyde is a particularly important VOC as it is even a carcinogen. Removal of VOCs is thus critical to control indoor air quality (IAQ). Photocatalytic oxidation has demonstrated feasibility to remove toxic VOCs and formaldehyde from indoor environments. The technique is highly-chemical stable, inexpensive, non-toxic, and capable of removing a wide variety of organics under light irradiation. In this paper, we review and summarize the traditional air cleaning methods and current photocatalytic oxidation approaches in both of VOCs and formaldehyde degradation in indoor environments. Influencing factors such as temperature, relative humidity, deactivation and reactivations of the photocatalyst are discussed. Aspects of the application of the photocatalytic technique to improve the IAQ are suggested.
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Lacombe S, Pigot T. Materials for selective photo-oxygenation vs. photocatalysis: preparation, properties and applications in environmental and health fields. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01929j] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Photosensitizing materials made of organic dyes embedded in various supports are compared to usual supported TiO2-based photocatalysts.
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Affiliation(s)
- S. Lacombe
- IPREM UMR CNRS 5254
- Université de Pau et des Pays de l'Adour
- 64053 Pau Cedex
- France
| | - T. Pigot
- IPREM UMR CNRS 5254
- Université de Pau et des Pays de l'Adour
- 64053 Pau Cedex
- France
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Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/978-3-662-48719-8_10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
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Visible-light activation of TiO2 photocatalysts: Advances in theory and experiments. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2015. [DOI: 10.1016/j.jphotochemrev.2015.08.003] [Citation(s) in RCA: 749] [Impact Index Per Article: 83.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Markowska-Szczupak A, Wang K, Rokicka P, Endo M, Wei Z, Ohtani B, Morawski AW, Kowalska E. The effect of anatase and rutile crystallites isolated from titania P25 photocatalyst on growth of selected mould fungi. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 151:54-62. [DOI: 10.1016/j.jphotobiol.2015.07.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 06/29/2015] [Accepted: 07/02/2015] [Indexed: 11/15/2022]
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