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Wang J, Vikrant K, Kim KH. Application of a manganese dioxide/amine-functionalized metal-organic framework nanocomposite as a bifunctional adsorbent-catalyst for the room-temperature removal of gaseous aromatic hydrocarbons. J Colloid Interface Sci 2024; 653:643-653. [PMID: 37741172 DOI: 10.1016/j.jcis.2023.09.108] [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: 04/18/2023] [Revised: 09/13/2023] [Accepted: 09/17/2023] [Indexed: 09/25/2023]
Abstract
A high surface area (883 m2·g-1) nanocomposite composed of an amine-functionalized metal-organic framework (NH2-UiO-66 (U6N)) and manganese dioxide (MnO2@U6N) was prepared as bifunctional adsorbent-catalyst for the purification of multiple aromatic volatile organic compounds (VOCs) such as benzene (B), toluene (T), m-xylene (X), and styrene (S), i.e., BTXS. The performance of MnO2@U6N was assessed for BTXS removal both as single- and multi-component systems at room temperature (RT (20 °C)) under dark conditions. MnO2@U6N exhibited superior catalytic-adsorption activity for the RT removal of BTXS. The removal performance of MnO2@U6N against BTXS was then assessed across varying levels of flow rate, VOC concentration, adsorbent/catalyst mass, and relative humidity. To better understand the catalytic-adsorption activity, two types of non-linear kinetic models (pseudo-first-order and pseudo-second-order) were utilized to simulate the experimentally obtained data. In-situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) analysis was also conducted to interpret the removal mechanism of BTXS. Their adsorption capacity (mg·g-1) values are estimated to increase in the order of B (21.1) < T (66.0) < X (79.1) < S (129.7). It is suggested that the adsorbed aromatic VOC molecules on the surface of MnO2@U6N should react with active oxygen species (lattice and adsorbed oxygen) to yield the environmentally benigh end products (i.e., carbon dioxide and water) along with various intermediates (e.g., alkoxides, aldehydes, phenolates, carboxylates, and anhydrides). Accordingly, the VOC removal potential of MnO2@U6N has been validated through the synergistic combination between adsorption (primary process) and catalysis (subordinate process) at RT.
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Affiliation(s)
- Jiapeng Wang
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Kumar Vikrant
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
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Recent Developments in Photocatalytic Nanotechnology for Purifying Air Polluted with Volatile Organic Compounds: Effect of Operating Parameters and Catalyst Deactivation. Catalysts 2023. [DOI: 10.3390/catal13020407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
Photocatalytic oxidation (PCO) is a successful method for indoor air purification, especially for removing low-concentration pollutants. Volatile organic compounds (VOCs) form a class of organic pollutants that are released into the atmosphere by consumer goods or via human activities. Once they enter the atmosphere, some might combine with other gases to create new air pollutants, which can have a detrimental effect on the health of living beings. This review focuses on current developments in the degradation of indoor pollutants, with an emphasis on two aspects of PCO: (i) influence of environmental (external) conditions; and (ii) catalyst deactivation and possible solutions. TiO2 is widely used as a photocatalyst in PCO because of its unique properties. Here, the potential effects of the operating parameters, such as the nature of the reactant, catalyst support, light intensity, and relative humidity, are extensively investigated. Then the developments and limitations of the PCO technique are highlighted, especially photocatalyst deactivation. Furthermore, the nature and deactivation mechanisms of photocatalysts are discussed, with possible solutions for reducing catalyst deactivation. Finally, the challenges and future directions of PCO technology for the elimination of indoor pollutants are compared and summarized.
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Okada A, Sekiguchi K, Sankoda K. Mechanisms for removal of gaseous toluene in headspace using sonophysical and sonochemical effects at the gas-liquid interface. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127221. [PMID: 34844351 DOI: 10.1016/j.jhazmat.2021.127221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 08/14/2021] [Accepted: 09/10/2021] [Indexed: 06/13/2023]
Abstract
We developed a new method for removing gaseous substances by using high frequency (200 kHz) ultrasonic irradiation of water, and the effects of ultrasonic irradiation on gas-phase toluene were evaluated quantitatively for the first time. The removal ratio of gaseous toluene increased with increasing ultrasonic power, but the reaction was inhibited by the addition of radical scavengers, indicating that ultrasonic irradiation not only accelerated the dissolution of gaseous toluene but also induced toluene decomposition. The contribution made by OH radicals to the decomposition of gaseous toluene at the gas-liquid interface was confirmed by the difference in removal ratios between addition of KI and addition of tert-butyl alcohol. The toluene removal mechanism was investigated by studying the logarithmic plots for toluene concentration at specified times. The results of this study clearly showed the promotion of gaseous toluene dissolution and the reaction via OH radicals at the gas-liquid interface by sonophysical and sonochemical effects with both effects contributing to the removal of gaseous toluene. Furthermore, the total organic carbon concentration in the aqueous phase increased with increasing reaction time, indicating that the toluene degradation products were trapped and decomposed into low-molecular-weight organic compounds in the aqueous phase.
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Affiliation(s)
- Akira Okada
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan
| | - Kazuhiko Sekiguchi
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan.
| | - Kenshi Sankoda
- Department of Environmental and Civil Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
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Wu J, Alipouri Y, Luo H, Zhong L. Ultraviolet photocatalytic oxidation technology for indoor volatile organic compound removal: A critical review with particular focus on byproduct formation and modeling. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126766. [PMID: 34396962 DOI: 10.1016/j.jhazmat.2021.126766] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/21/2021] [Accepted: 07/26/2021] [Indexed: 06/13/2023]
Abstract
Photocatalytic oxidation (PCO)-based air filters are gaining attention owing to their capacity for indoor pollutant removal. This review summarized the application of ultraviolet-photocatalytic oxidation (UV-PCO) in heating, ventilation, and air conditioning (HVAC) systems, including the modeling studies, reactor designs, the influence of operational conditions, with emphasis on the common issue of byproduct generation, and the resulting indoor byproduct exposure levels. As a result, the concentrations of the typical byproducts for the most challenging pollutants were relatively low, except for the PCO of ethanol. Hence, UV-PCO is not recommended for buildings with high ethanol concentrations. Based on the formation of the formaldehyde, a new exposure-based evaluation standard for UV-PCO was developed to evaluate the feasibility of integrating UV-PCO reactors into an HVAC system. Then, applying the newly developed evaluation standard on a developed database (data size: 174) from the literature, 32.5% of the cases were identified as suitable for HVAC system applications in residential and commercial buildings, and all cases could be used for industrial buildings. Finally, a case study was conducted to develop a support vector machine (SVM) classification model with good accuracy, and challenging compound types, inlet concentrations, and air velocity were found to be the main parameters affecting the applicability of UV-PCO.
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Affiliation(s)
- Jing Wu
- Department of Mechanical Engineering, University of Alberta, 9211-116 street NW, Edmonton, Alberta, Canada T6G 1H9
| | - Yousef Alipouri
- Department of Mechanical Engineering, University of Alberta, 9211-116 street NW, Edmonton, Alberta, Canada T6G 1H9
| | - Hao Luo
- Department of Mechanical Engineering, University of Alberta, 9211-116 street NW, Edmonton, Alberta, Canada T6G 1H9
| | - Lexuan Zhong
- Department of Mechanical Engineering, University of Alberta, 9211-116 street NW, Edmonton, Alberta, Canada T6G 1H9.
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Wei Y, Xu P, Wei T, Chen L, Wang X, Li S, Guo T, Li W. Role of Manganese Doping TiO2 Hollow Spheres under Vacuum Ultraviolet Irradiation. KINETICS AND CATALYSIS 2021. [DOI: 10.1134/s0023158421010110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Liang S, Shu Y, Li K, Ji J, Huang H, Deng J, Leung DYC, Wu M, Zhang Y. Mechanistic insights into toluene degradation under VUV irradiation coupled with photocatalytic oxidation. JOURNAL OF HAZARDOUS MATERIALS 2020; 399:122967. [PMID: 32504905 DOI: 10.1016/j.jhazmat.2020.122967] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/13/2020] [Accepted: 05/14/2020] [Indexed: 06/11/2023]
Abstract
Volatile organic compounds (VOCs) exists ubiquitously in chemical industries and were regarded as major contributors to air pollution, which should be strictly regulated. Vacuum ultraviolet irradiation coupled with photocatalytic oxidation (VUV-PCO) has been considered as an efficient approach to VOCs removal due to high-energy photons which could break down VOCs directly and be absorbed by photocatalysts to generate free radicals for further oxidation. However, the photochemical transformation mechanisms of VOCs have not been fully revealed. Herein, we systematically analyzed the intermediates using proton-transfer-reaction mass spectrometer (PTR-MS) to explore the transformation mechanisms of toluene degradation in VUV and VUV-PCO processes. VUV-PCO process displayed superior toluene degradation efficiency (50 %) and mineralization efficiency (65 %) compared with single VUV photolysis (35 %) and UV photocatalysis (5 %). TiO2 was deeply involved into CO2 generalization by amplifying the advantages of VUV system and further mineralizing the intermediates. In VUV and VUV-PCO processes, O2 participation changed the intermediates distribution by increasing multiple oxygenated products, while the introduction of water contributed to the formation and degradation of most intermediates. A possible degradation mechanism of toluene under VUV irradiation combined with TiO2 was proposed. This study provides a deep mechanistic insight into VOCs degradation by VUV-PCO process.
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Affiliation(s)
- Shimin Liang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
| | - Yajie Shu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
| | - Kai Li
- Guangdong Indoor Air Pollution Control Engineering Research Center, Sun Yat-sen University, Guangzhou 510006, PR China
| | - Jian Ji
- Guangdong Indoor Air Pollution Control Engineering Research Center, Sun Yat-sen University, Guangzhou 510006, PR China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Indoor Air Pollution Control Engineering Research Center, Sun Yat-sen University, Guangzhou 510006, PR China.
| | - Jiguang Deng
- College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Dennis Y C Leung
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Muyan Wu
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Yingguang Zhang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
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Xu T, Zheng H, Zhang P. Isolated Pt single atomic sites anchored on nanoporous TiO 2 film for highly efficient photocatalytic degradation of low concentration toluene. JOURNAL OF HAZARDOUS MATERIALS 2020; 388:121746. [PMID: 31859166 DOI: 10.1016/j.jhazmat.2019.121746] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 11/15/2019] [Accepted: 11/21/2019] [Indexed: 06/10/2023]
Abstract
Single atom catalysts with atomically distributed active metal centers have attracted great attention owing to their maximum atom efficiency and excellent activity. Herein, we report a novel photocatalyst with isolated Pt single atomic sites anchored on nanoporous TiO2 film prepared by a facile immersion and reduction method. HAADF-STEM, XPS, XANES and EXAFS results confirmed the anchoring of Pt single atomic sites on nanoporous TiO2 film. The effects of immersion concentration of Pt, reduction temperature, relative humidity, inlet toluene concentration and residence time on photocatalytic degradation of low concentration toluene under UV and VUV irradiation were investigated. The results showed that the as-prepared catalyst had considerably high photocatalytic activity. The removal rate of toluene reached 45.88% under VUV irradiation when the inlet toluene concentration and residence time were 200 ppb and 0.3 s, respectively, which was 5.94 times that of pristine nanoporous TiO2 film. The by-product ozone removal was greatly improved and the corresponding energy consumption was 0.01 kW·h/m3. While the removal rate of toluene increased with the decrease of inlet toluene concentration under UV irradiation. The Pt single atom catalyst exhibits significant potential for photocatalytic degradation of low concentration VOCs in indoor environments.
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Affiliation(s)
- Tongzhou Xu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Hong Zheng
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China.
| | - Pengyi Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
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8
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Liu B, Zhan Y, Xie R, Huang H, Li K, Zeng Y, Shrestha RP, Kim Oanh NT, Winijkul E. Efficient photocatalytic oxidation of gaseous toluene in a bubbling reactor of water. CHEMOSPHERE 2019; 233:754-761. [PMID: 31200135 DOI: 10.1016/j.chemosphere.2019.06.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 05/23/2019] [Accepted: 06/02/2019] [Indexed: 06/09/2023]
Abstract
Conventional gas-solid photocatalytic oxidation (SPCO) of VOCs has drawbacks such as accumulation of intermediates and catalytic deactivation. In this study, gas-liquid photocatalytic oxidation (LPCO) was exploited to improve the catalytic activity and stability by continuously bubbling VOCs into water. Toluene and commercial TiO2 (P25) were chosen as the representative VOC pollutant and photocatalyst, respectively. Toluene removal efficiency in LPCO was about 6 times of that in conventional SPCO, and no intermediates were detected in the exhaust of LPCO probably due to its high degradation and mineralization rates. However, plentiful intermediates were identified by GC-MS and ITMS both in the gas outlet and on the surface of catalyst in SPCO, which may lead to photocatalytic deactivation. Moreover, LPCO exhibited superior catalytic activity towards typical soluble VOCs such as formaldehyde compared to SPCO. The soluble intermediates formed from toluene degradation can be easily removed by sustaining UV irradiation to avoid water pollution and the water after purification can be reused in LPCO. This study provides a novel gas-liquid photocatalytic oxidation to replace conventional gas-solid photocatalytic oxidation for the sake of better catalytic activity and fewer by-products.
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Affiliation(s)
- Biyuan Liu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China
| | - Yujie Zhan
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China
| | - Ruijie Xie
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China; Guangdong-Hong Kong Joint Research Center for Air Pollution Control, China.
| | - Kai Li
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China; Guangdong-Hong Kong Joint Research Center for Air Pollution Control, China
| | - Yuxuan Zeng
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China; Guangdong-Hong Kong Joint Research Center for Air Pollution Control, China
| | - Rajendra P Shrestha
- School of Environment, Resources and Development, Asian Institute of Technology, Klongluang, Pathumthani 12120, Thailand
| | - Nguyen Thi Kim Oanh
- School of Environment, Resources and Development, Asian Institute of Technology, Klongluang, Pathumthani 12120, Thailand
| | - Ekbordin Winijkul
- School of Environment, Resources and Development, Asian Institute of Technology, Klongluang, Pathumthani 12120, Thailand
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9
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Wu M, Zhang Y, Szeto W, Pan W, Huang H, Leung DY. Vacuum ultraviolet (VUV)-based photocatalytic oxidation for toluene degradation over pure CeO2. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.01.056] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Dos Reis Vargas M, de Castro EAS, Politi JRDS, Gargano R, Martins JBL. BTEX adsorption on TiO 2 anatase and rutile surfaces: DFT functionals. J Mol Model 2019; 25:137. [PMID: 31030259 DOI: 10.1007/s00894-019-4027-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 04/04/2019] [Indexed: 11/25/2022]
Abstract
Benzene, toluene, ethylbenzene, and xylenes are volatile hydrocarbons known as BTEX, which present concerns about environmental problems. Density functional theory (DFT) functionals were used for the BTEX gas phase adsorption on TiO2 (110) of rutile and (101) of anatase surfaces. Dispersion terms have shown the importance to treat weak interactions and were used to study these adsorptions using plane wave DFT calculations. All BTEX molecules have the same trend for the adsorption on rutile and anatase surfaces. The inclusion of dispersion terms has a significant contribution for the interaction energy. Density of states results suggest the hybridization between the d state of pentacoordinated titanium atoms (Ti5C) and carbon p states of benzene. The adsorption energy values indicate an effective interaction between the BTEX and surfaces, mainly due to the aromatic π interaction, which is present in all adsorbates. However, for p-xylene the methyl hydrogen directs the second major influence. Graphical abstract Charge difference showing the system with the smallest interaction and the one with the largest interaction.
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Affiliation(s)
- Marcos Dos Reis Vargas
- Institute of Chemistry, University of Brasilia, Brasília, DF, CEP 70904970, Brazil
- Federal Institute of Goiás, Campus Goiânia, Goiânia, GO, 74055110, Brazil
| | - Elton A S de Castro
- State University of Goiás, Av. Universitária s/n, Formosa, GO, 73807250, Brazil
| | - José R Dos S Politi
- Institute of Chemistry, University of Brasilia, Brasília, DF, CEP 70904970, Brazil
| | - Ricardo Gargano
- Institute of Physics, University of Brasilia, Brasília, DF, CEP 70904970, Brazil
| | - João B L Martins
- Institute of Chemistry, University of Brasilia, Brasília, DF, CEP 70904970, Brazil.
- Instituto de Química, Universidade de Brasília, CP 4478, Brasília, DF, 70904-970, Brazil.
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Ngo S, Betts LM, Dappozze F, Guillard C. Photocatalytic Selectivities of Ethane, Methane and Dimethylether Controlled by Reaction Conditions and TiO2 Structure in the Degradation of Acetic Acid. ChemistrySelect 2018. [DOI: 10.1002/slct.201802700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Son Ngo
- University of LyonInstitute of Researches on Catalysis and Environment in Lyon (IRCELYON) CNRSUniversité Claude Bernard Lyon 1 2 avenue Albert Einstein F- 69626 Villeurbanne France
- Hanoi University of Mining and Geology 8 Vien street, Duc Thang commune, North Tu Liem district Hanoi Vie
| | - Lynn M. Betts
- University of LyonInstitute of Researches on Catalysis and Environment in Lyon (IRCELYON) CNRSUniversité Claude Bernard Lyon 1 2 avenue Albert Einstein F- 69626 Villeurbanne France
| | - Frederic Dappozze
- University of LyonInstitute of Researches on Catalysis and Environment in Lyon (IRCELYON) CNRSUniversité Claude Bernard Lyon 1 2 avenue Albert Einstein F- 69626 Villeurbanne France
| | - Chantal Guillard
- University of LyonInstitute of Researches on Catalysis and Environment in Lyon (IRCELYON) CNRSUniversité Claude Bernard Lyon 1 2 avenue Albert Einstein F- 69626 Villeurbanne France
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12
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Jeon JW, Lee DH, Won YS, Lee MG. Characteristics of photocatalytic decomposition of individual and binary mixture vapors of some VOCs by a cylindrical UV reactor with helically installed TiO2-coated perforated planes. KOREAN J CHEM ENG 2018. [DOI: 10.1007/s11814-017-0320-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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13
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Jędrzejczyk M, Zbudniewek K, Rynkowski J, Keller V, Grams J, Ruppert AM, Keller N. Wide band gap Ga 2O 3 as efficient UV-C photocatalyst for gas-phase degradation applications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:26792-26805. [PMID: 28963641 DOI: 10.1007/s11356-017-0253-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 09/19/2017] [Indexed: 06/07/2023]
Abstract
α, β, γ, and δ polymorphs of 4.6-4.8 eV wide band gap Ga2O3 photocatalysts were prepared via a soft chemistry route. Their photocatalytic activity under 254 nm UV-C light in the degradation of gaseous toluene was strongly depending on the polymorph phase. α- and β-Ga2O3 photocatalysts enabled achieving high and stable conversions of toluene with selectivities to CO2 within the 50-90% range, by contrast to conventional TiO2 photocatalysts that fully deactivate very rapidly on stream in similar operating conditions with rather no CO2 production, no matter whether UV-A or UV-C light was used. The highest performances were achieved on the high specific surface area β-Ga2O3 photocatalyst synthesized by adding polyethylene glycol (PEG) as porogen before precipitation, with stable toluene conversion and mineralization rate into CO2 strongly overcoming those obtained on commercial β-Ga2O3. They were attributed to favorable physicochemical properties in terms of high specific surface area, small mean crystallite size, good crystallinity, high pore volume with large size mesopore distribution and appropriate surface acidity, and to the possible existence of a double local internal field within Ga3+ units. In the degradation of hydrogen sulfide, PEG-derived β-Ga2O3 takes advantage from its high specific surface area for storing sulfate, and thus for increasing its resistance to deactivation and the duration at total sulfur removal when compared to other β-Ga2O3 photocatalysts. So, we illustrated the interest of using high surface area β-Ga2O3 in environmental photocatalysis for gas-phase depollution applications.
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Affiliation(s)
- Marcin Jędrzejczyk
- Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Żeromskiego 116, 90-924, Łódź, Poland
| | - Klaudia Zbudniewek
- Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Żeromskiego 116, 90-924, Łódź, Poland
| | - Jacek Rynkowski
- Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Żeromskiego 116, 90-924, Łódź, Poland
| | - Valérie Keller
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), CNRS, University of Strasbourg, 25 rue Becquerel, 67087, Strasbourg, France
| | - Jacek Grams
- Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Żeromskiego 116, 90-924, Łódź, Poland
| | - Agnieszka M Ruppert
- Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Żeromskiego 116, 90-924, Łódź, Poland.
| | - Nicolas Keller
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), CNRS, University of Strasbourg, 25 rue Becquerel, 67087, Strasbourg, France.
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14
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Gruss AF, Rodriguez R, Mazyck DW. Mercury Oxidation by UV Irradiation: Effect of Contact Time, UV Wavelength, and Moisture Content. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b00032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander F. Gruss
- Siemens Industry Inc., 4800 North Point Parkway, Alpharetta, Georgia 30022, United States
| | - Regina Rodriguez
- Environmental Engineering Sciences, University of Florida, Gainesville, Florida 32611, United States
| | - David W. Mazyck
- Environmental Engineering Sciences, University of Florida, Gainesville, Florida 32611, United States
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Ayekoe CYP, Robert D, Lanciné DG. Combination of coagulation-flocculation and heterogeneous photocatalysis for improving the removal of humic substances in real treated water from Agbô River (Ivory-Coast). Catal Today 2017. [DOI: 10.1016/j.cattod.2016.09.024] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Huang H, Liu G, Zhan Y, Xu Y, Lu H, Huang H, Feng Q, Wu M. Photocatalytic Oxidation of Gaseous Benzene under VUV Irradiation over TiO 2 /Zeolites Catalysts. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.07.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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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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18
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Ma J, Zhu C, Xu Y, Lu J, Huang L, Yang Z. Photocatalytic degradation of gaseous benzene with H3PW12O40/TiO2/palygorskite composite catalyst. JOURNAL OF SAUDI CHEMICAL SOCIETY 2017. [DOI: 10.1016/j.jscs.2015.02.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Wang H, Yu B, Jiang S, Jiang L, Qian L. UV/ozone-assisted tribochemistry-induced nanofabrication on Si(100) surfaces. RSC Adv 2017. [DOI: 10.1039/c7ra07198a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
UV/ozone oxidation provides a simple and efficient method to prepare super-hydrophilic SiOx films for tribochemistry-induced nanofabrication on Si substrates.
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Affiliation(s)
- Hongbo Wang
- Tribology Research Institute
- State Key Laboratory of Traction Power
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Bingjun Yu
- Tribology Research Institute
- State Key Laboratory of Traction Power
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Shulan Jiang
- Tribology Research Institute
- State Key Laboratory of Traction Power
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Liang Jiang
- Tribology Research Institute
- State Key Laboratory of Traction Power
- Southwest Jiaotong University
- Chengdu 610031
- China
| | - Linmao Qian
- Tribology Research Institute
- State Key Laboratory of Traction Power
- Southwest Jiaotong University
- Chengdu 610031
- China
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20
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Won YS, Jeon JW, Lee DH, Lee MG. Photocatalytic Decomposition of Toluene by a Cylindrical UV Reactor with Helically Installed TiO 2-Coated Perforated Planes. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2017. [DOI: 10.1252/jcej.16we249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yong Sun Won
- Department of Chemical Engineering, Pukyong National University
| | - Jin-Woo Jeon
- Department of Chemical Engineering, Pukyong National University
| | | | - Min-Gyu Lee
- Department of Chemical Engineering, Pukyong National University
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21
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Khodadadian F, Poursaeidesfahani A, Li Z, van Ommen JR, Stankiewicz AI, Lakerveld R. Model-Based Optimization of a Photocatalytic Reactor with Light-Emitting Diodes. Chem Eng Technol 2016. [DOI: 10.1002/ceat.201600010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Palau J, Assadi A, Penya-roja J, Bouzaza A, Wolbert D, Martínez-Soria V. Isovaleraldehyde degradation using UV photocatalytic and dielectric barrier discharge reactors, and their combinations. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2014.11.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Andriampanarivo HL, Köhler M, Gejo JL, Betzwieser T, Poon BCY, Lock Yue P, Ravelomanantsoa SD, Braun AM. Continuous process of the vacuum ultraviolet- (VUV-) photochemical oxidation of thiophene in the gas phase. Photochem Photobiol Sci 2015; 14:1013-24. [DOI: 10.1039/c4pp00476k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Based on kinetic data and intermediate products of oxidation, reaction pathways of the oxidative degradation of gaseous thiophene are discussed.
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Affiliation(s)
| | - Martin Köhler
- Lehrstuhl für Umweltmesstechnik
- Universität Karlsruhe
- 76128 Karlsruhe
- Germany
| | - Juan López Gejo
- Lehrstuhl für Umweltmesstechnik
- Universität Karlsruhe
- 76128 Karlsruhe
- Germany
| | - Thomas Betzwieser
- Lehrstuhl für Umweltmesstechnik
- Universität Karlsruhe
- 76128 Karlsruhe
- Germany
| | - Benny C. Y. Poon
- Department of Chemical Engineering
- Hong Kong University of Science and Technology (HKUST)
- Kowloon
- China
| | - Po Lock Yue
- Department of Chemical Engineering
- Hong Kong University of Science and Technology (HKUST)
- Kowloon
- China
| | | | - André M. Braun
- Lehrstuhl für Umweltmesstechnik
- Universität Karlsruhe
- 76128 Karlsruhe
- Germany
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24
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Jo WK, Kang HJ. Photocatalysis of sub-ppm limonene over multiwalled carbon nanotubes/titania composite nanofiber under visible-light irradiation. JOURNAL OF HAZARDOUS MATERIALS 2014; 283:680-688. [PMID: 25464310 DOI: 10.1016/j.jhazmat.2014.09.067] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Revised: 09/22/2014] [Accepted: 09/29/2014] [Indexed: 06/04/2023]
Abstract
This study was conducted under visible-light exposure to investigate the photocatalytic characteristics of a multiwalled carbon nanotube/titania (TiO2) composite nanofiber (MTCN) using a continuous-flow tubular reactor. The MTCN was prepared by a sol-gel process, followed by an electrospinning technique. The photocatalytic decomposition efficiency for limonene on the MTCN was higher than those obtained from reference TiO2 nanofibers or P25 TiO2, and the experimental results agreed well with the Langmuir-Hinshelwood model. The CO concentrations generated during the photocatalysis did not reach levels toxic to humans. The mineralization efficiency for limonene on the MTCN was also higher than that for P25 TiO2. Moreover, the mineralization efficiency obtained using the MTCN increased steeply from 8.3 to 91.1% as the residence time increased from 7.8 to 78.0s, compared to the increase in the decomposition efficiencies for limonene from 90.1 to 99.9%. Three gas-phase intermediates (methacrolein, acetic acid, and limonene oxide) were quantitatively determined for the photocatalysis for limonene over the MTCN, whereas only two intermediates (acetic acid and limonene oxide) were quantitatively determined over P25 TiO2. Other provisional gas-phase intermediates included cyclopropyl methyl ketone and 2-ethylbutanal.
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Affiliation(s)
- Wan-Kuen Jo
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, South Korea.
| | - Hyun-Jung Kang
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, South Korea
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25
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Catalysis Removal of Indoor Volatile Organic Compounds in Room Temperature: From Photocatalysis to Active Species Assistance Catalysis. CATALYSIS SURVEYS FROM ASIA 2014. [DOI: 10.1007/s10563-014-9177-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Jo WK, Kang HJ, Chun HH. Degradation of gas-phase organic contaminants via nitrogen-embedded one-dimensional rod-shaped titania in a plug-flow reactor. ENVIRONMENTAL TECHNOLOGY 2014; 35:2132-2139. [PMID: 25145164 DOI: 10.1080/09593330.2014.894581] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, one-dimensional rod-shaped titania (RST) and nitrogen-doped RST (N-RST) with different ratios of N to Ti were prepared using a hydrothermal method and their applications for purification of indoor toxic organic contaminants in a plug-flow reactor were examined under visible or ultraviolet (UV) irradiation. The surface characteristics of as-prepared photocatalysts were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible spectroscopy. The TEM images revealed that both pure RSTs and N-RSTs displayed uniform and nanorod-shaped structures. XRD revealed that the photocatalysts had crystalline TiO2. The UV-visible spectra demonstrated that the N-RSTs could be activated in the visible region. In most cases, N-RSTs showed higher degradation efficiencies than pure RSTs under visible-light and UV irradiation. N-RSTs with a N-to-Ti ratio of 0.5 exhibited the highest degradation efficiencies of benzene, toluene, ethyl benzene, and o-xylene (BTEX), suggesting the presence of an optimal N-to-Ti ratio for preparation of N-RSTs. In addition, the average degradation efficiencies of BTEX determined for the N-RSTs with a N-to-Ti ratio of 0.5 under visible-light irradiation for the lowest initial concentration (IC, 0.1 ppm) were 19%, 53%, 85%, and 92%, respectively, while the degradation efficiencies for the highest IC (2.0 ppm) were 2%, 8%, 17%, and 33%. These values decreased as the stream flow rate increased. Overall, the as-prepared N-RSTs could be effectively applied for degradation of toxic gas-phase organic contaminants under visible-light as well as UV irradiation.
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27
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Jo WK, Kang HJ. Aluminum sheet-based S-doped TiO2 for photocatalytic decomposition of toxic organic vapors. CHINESE JOURNAL OF CATALYSIS 2014. [DOI: 10.1016/s1872-2067(14)60076-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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28
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Fu P, Zhang P. Characterization of Pt-TiO2 film used in three formaldehyde photocatalytic degradation systems: UV254 nm, O3+UV254 nm and UV254+185 nm via X-ray photoelectron spectroscopy. CHINESE JOURNAL OF CATALYSIS 2014. [DOI: 10.1016/s1872-2067(12)60740-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Ayoko GA, Wang H. Volatile Organic Compounds in Indoor Environments. THE HANDBOOK OF ENVIRONMENTAL CHEMISTRY 2014. [DOI: 10.1007/698_2014_259] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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30
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Ângelo J, Andrade L, Madeira LM, Mendes A. An overview of photocatalysis phenomena applied to NOx abatement. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2013; 129:522-39. [PMID: 24018117 DOI: 10.1016/j.jenvman.2013.08.006] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 07/02/2013] [Accepted: 08/01/2013] [Indexed: 05/22/2023]
Abstract
This review provides a short introduction to photocatalysis technology in terms of the present environmental remediation paradigm and, in particular, NOx photoabatement. The fundamentals of photoelectrochemical devices and the photocatalysis phenomena are reviewed, highlighting the main reaction mechanisms. The critical historical developments on heterogeneous photocatalysis are briefly discussed, giving particular emphasis to the pioneer works in this field. The third part of this work focus mainly on NOx removal technology considering topics such as: TiO2 photochemistry; effect of the operating conditions on the photocatalysis process; Langmuir-Hinshelwood modeling; TiO2 photocatalytic immobilization approaches; and their applications. The last section of the paper presents the main conclusions and perspectives on the opportunities related to this technology.
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Affiliation(s)
- Joana Ângelo
- LEPAE, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, 4200-465 Porto, Portugal
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31
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Zhong L, Haghighat F, Lee CS, Lakdawala N. Performance of ultraviolet photocatalytic oxidation for indoor air applications: systematic experimental evaluation. JOURNAL OF HAZARDOUS MATERIALS 2013; 261:130-138. [PMID: 23912078 DOI: 10.1016/j.jhazmat.2013.07.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Revised: 07/06/2013] [Accepted: 07/09/2013] [Indexed: 06/02/2023]
Abstract
Photocatalytic oxidation (PCO) is a promising technology that has potential to be applied in mechanically ventilated buildings to improve indoor air quality (IAQ). However, the major research studies were done in bench-top scale reactors under ideal reaction conditions. In addition, no study has been carried out on the investigation of the ozonation and photolysis effect using a pilot duct system. The objective of this study is the development of methodologies to evaluate the performance of PCO systems. A systematic parametric evaluation of the effects of various kinetic parameters, such as compound's type, inlet concentration, airflow rate, light intensity, and relative humidity, was conducted, and new interpretations were provided from a fundamental analysis. In addition, the photolysis effect under vacuum ultraviolet (VUV) irradiation for a variety of volatile organic compounds (VOCs) was examined for the first time in a pilot duct system. The performance comparison of ultraviolet C (UVC)-PCO and VUV-PCO was also discussed due to the presence of ozone. Moreover, the formation of by-products generated with or without ozone generation was fully compared to evaluate the PCO technology.
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Affiliation(s)
- Lexuan Zhong
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
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32
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Assadi AA, Palau J, Bouzaza A, Wolbert D. Modeling of a continuous photocatalytic reactor for isovaleraldehyde oxidation: Effect of different operating parameters and chemical degradation pathway. Chem Eng Res Des 2013. [DOI: 10.1016/j.cherd.2013.02.020] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Zhao W, Yang Y, Dai J, Liu F, Wang Y. VUV photolysis of naphthalene in indoor air: Intermediates, pathways, and health risk. CHEMOSPHERE 2013; 91:1002-1008. [PMID: 23461839 DOI: 10.1016/j.chemosphere.2013.01.086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Revised: 01/09/2013] [Accepted: 01/21/2013] [Indexed: 06/01/2023]
Abstract
To evaluate the health risk of vacuum ultraviolet (VUV) photolysis of naphthalene (NP) in indoor air, intermediates were detected by gas chromatograph-mass spectrometry and proton transfer reaction-mass spectrometry. Results showed that 13 volatile organic compounds (VOCs) in gas phase and five semi-volatile organic compounds (SVOCs) in oil phase were the main intermediates. VUV photolysis pathways of NP can be divided into five stages including functionalization, partition, condensation, fragmentation, and mineralization. Initially NP was converted into several SVOCs via functionalization by oxidative radicals. SVOCs with high boiling points and polarity groups would partition between aerosol and gas phase. Certain amount of SVOCs in aerosol phase were transformed to oily substances by condensation, which can be washed out by conventional gas washing technique like wet scrubber easily. A majority of SVOCs in gas phase were converted to VOCs by fragmentation, which can be further mineralized into CO2. The accumulation of VOCs, especially highly harmful aldehydes, resulted in an increase of health risk influence index (η) to 150 after VUV irradiation of 2.81min, while the mineralization of VOCs led to a sharp decline of η to 28 after VUV irradiation of 7.01min. It can be concluded that the mineralization of VOCs is a key factor to alleviate the health risk of photolysis. The results will guide a safe and economical application of VUV photolysis technology in indoor air purification.
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Affiliation(s)
- Weirong Zhao
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
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34
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Jo WK, Kang HJ. Polyacrylonitrile-TiO2 Fibers for Control of Gaseous Aromatic Compounds. Ind Eng Chem Res 2013. [DOI: 10.1021/ie303178u] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wan-Kuen Jo
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea
| | - Hyun-Jung Kang
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea
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35
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Studies on Photodegradation Kinetics of Rhodamine B by Titanium Dioxide - Carbon Composite Materials. ACTA ACUST UNITED AC 2012. [DOI: 10.4028/www.scientific.net/amr.531.59] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The composite materials were prepared with high-viscosity clay as carrier, activated carbon as adsorbent, and titanium dioxide as photocatalyst.Kinetic process of photocatalytic degradation of rhodamine B was investigated at different reaction conditions using the composite materials.The results shown that : rhodamine B was the maximum catalytic activity when the initial reaction solution concentration is 5mg/L,pH=6,and composite material dosing quantity is 5g/L.The kinetics of photocatalytic degradation reaction can be expressed by the first-order reaction kinetic model.
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36
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Assadi AA, Bouzaza A, Wolbert D. Photocatalytic oxidation of trimethylamine and isovaleraldehyde in an annular reactor: Influence of the mass transfer and the relative humidity. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.03.020] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Palau J, Colomer M, Penya-Roja JM, Martínez-Soria V. Photodegradation of Toluene, m-Xylene, and n-Butyl Acetate and Their Mixtures over TiO2 Catalyst on Glass Fibers. Ind Eng Chem Res 2012. [DOI: 10.1021/ie300357x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jordi Palau
- Research
Group GI2AM, Department
of Chemical Engineering, School of Engineering, University of Valencia, Avda. Universitat s/n, 46100
Burjassot, Valencia, Spain
| | - Margarita Colomer
- Research
Group GI2AM, Department
of Chemical Engineering, School of Engineering, University of Valencia, Avda. Universitat s/n, 46100
Burjassot, Valencia, Spain
| | - Josep M. Penya-Roja
- Research
Group GI2AM, Department
of Chemical Engineering, School of Engineering, University of Valencia, Avda. Universitat s/n, 46100
Burjassot, Valencia, Spain
| | - Vicente Martínez-Soria
- Research
Group GI2AM, Department
of Chemical Engineering, School of Engineering, University of Valencia, Avda. Universitat s/n, 46100
Burjassot, Valencia, Spain
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38
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Kibanova D, Sleiman M, Cervini-Silva J, Destaillats H. Adsorption and photocatalytic oxidation of formaldehyde on a clay-TiO2 composite. JOURNAL OF HAZARDOUS MATERIALS 2012; 211-212:233-239. [PMID: 22226716 DOI: 10.1016/j.jhazmat.2011.12.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 11/30/2011] [Accepted: 12/01/2011] [Indexed: 05/31/2023]
Abstract
We investigated the adsorption capacity and photocatalytic removal efficiency of formaldehyde using a hectorite-TiO(2) composite in a bench flow reactor. The same experimental conditions were applied to pure TiO(2) (Degussa P25) as a reference. The catalysts were irradiated with either a UVA lamp (365 nm) or with one of two UVC lamps of 254 nm and 254+185 nm, respectively. Formaldehyde was introduced upstream at concentrations of 100-500 ppb, with relative humidity (RH) in the range 0-66% and residence times between 50 and 500 ms. Under dry air and without illumination, saturation of catalyst surfaces was achieved after ≈ 200 min for P25 and ≈ 1000 min for hectorite-TiO(2). The formaldehyde uptake capacity by hectorite-TiO(2) was 4.1 times higher than that of P25, almost twice the BET surface area ratio. In the presence of humidity, the difference in uptake efficiency between both materials disappeared, and saturation was achieved faster (after ≈ 200 min at 10% RH and ≈ 60 min at 65% RH). Under irradiation with each of the three UV sources, removal efficiencies were proportional to the Ti content and increased with contact time. The removal efficiency decreased at high RH. A more complete elimination of formaldehyde was observed with the 254+185 nm UV source.
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Affiliation(s)
- Daria Kibanova
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico
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39
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Yu J, Cai W, Chen J, Feng L, Jiang Y, Cheng Z. Conversion characteristics and mechanism analysis of gaseous dichloromethane degraded by a VUV light in different reaction media. J Environ Sci (China) 2012; 24:1777-1784. [PMID: 23520847 DOI: 10.1016/s1001-0742(11)61021-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The photodegradation of gaseous dichloromethane (DCM) by a vacuum ultraviolet (VUV) light in a spiral reactor was investigated with different reaction media and initial concentrations. Through the combination of direct photolysis, O3 oxidation and HO* oxidation, DCM was ultimately mineralized into inorganic compounds (such as HCl, CO2, H2O, etc.) in the air with relative humidity (RH) of 75%-85%. During the photodegradation process, some small organic acids (including formic acid, acetic acid) were also detected and the intermediates were more soluble than DCM, providing a possibility for its combination with subsequent biodegradation. Based on the detected intermediates and the confirmed radicals, a photodegradation pathway of DCM by VUV was proposed. With RH 75%-80% air as the reaction medium, the DCM removal followed the second-order kinetic model at inlet concentration of 100-1000 mg/m3. Kinetic analysis showed that the reaction media affected the kinetic constants of DCM conversion by a large extent, and RH 80% air could cause a much lower half-life for its conversion. Such results supported the possibility that VUV photodegradation could be used not only for the mineralization of DCM but also as a pretreatment before biodegradation.
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Affiliation(s)
- Jianming Yu
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
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40
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Huang H, Leung DY, Li G, Leung MK, Fu X. Photocatalytic destruction of air pollutants with vacuum ultraviolet (VUV) irradiation. Catal Today 2011. [DOI: 10.1016/j.cattod.2011.04.015] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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Zhang Y, Mo J, Li Y, Sundell J, Wargocki P, Zhang J, Little JC, Corsi R, Deng Q, Leung MH, Fang L, Chen W, Li J, Sun Y. Can commonly-used fan-driven air cleaning technologies improve indoor air quality? A literature review. ATMOSPHERIC ENVIRONMENT (OXFORD, ENGLAND : 1994) 2011; 45:4329-4343. [PMID: 32362761 PMCID: PMC7185562 DOI: 10.1016/j.atmosenv.2011.05.041] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 05/13/2011] [Accepted: 05/14/2011] [Indexed: 05/19/2023]
Abstract
Air cleaning techniques have been applied worldwide with the goal of improving indoor air quality. The effectiveness of applying these techniques varies widely, and pollutant removal efficiency is usually determined in controlled laboratory environments which may not be realized in practice. Some air cleaners are largely ineffective, and some produce harmful by-products. To summarize what is known regarding the effectiveness of fan-driven air cleaning technologies, a state-of-the-art review of the scientific literature was undertaken by a multidisciplinary panel of experts from Europe, North America, and Asia with expertise in air cleaning, aerosol science, medicine, chemistry and ventilation. The effects on health were not examined. Over 26,000 articles were identified in major literature databases; 400 were selected as being relevant based on their titles and abstracts by the first two authors, who further reduced the number of articles to 160 based on the full texts. These articles were reviewed by the panel using predefined inclusion criteria during their first meeting. Additions were also made by the panel. Of these, 133 articles were finally selected for detailed review. Each article was assessed independently by two members of the panel and then judged by the entire panel during a consensus meeting. During this process 59 articles were deemed conclusive and their results were used for final reporting at their second meeting. The conclusions are that: (1) None of the reviewed technologies was able to effectively remove all indoor pollutants and many were found to generate undesirable by-products during operation. (2) Particle filtration and sorption of gaseous pollutants were among the most effective air cleaning technologies, but there is insufficient information regarding long-term performance and proper maintenance. (3) The existing data make it difficult to extract information such as Clean Air Delivery Rate (CADR), which represents a common benchmark for comparing the performance of different air cleaning technologies. (4) To compare and select suitable indoor air cleaning devices, a labeling system accounting for characteristics such as CADR, energy consumption, volume, harmful by-products, and life span is necessary. For that purpose, a standard test room and condition should be built and studied. (5) Although there is evidence that some air cleaning technologies improve indoor air quality, further research is needed before any of them can be confidently recommended for use in indoor environments.
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Key Words
- AC, activated carbon
- Air cleaner
- BTEX, benzene, toluene, ethyl benzene, and xylene
- By-product
- CADR, clean air delivery rate
- CFM, cubic feet per minute
- Clean air delivery rate (CADR)
- DBD, dielectric barrier discharge
- EPA, Environmental Protection Agency
- ESP, electrostatic precipitator
- Electrostatic precipitator
- HEPA, high efficiency particulate air
- High efficiency particulate air (HEPA)
- IAQ, indoor air quality
- Indoor air quality (IAQ)
- Ion generator
- Ozone
- PCO, photocatalytic oxidation
- Photocatalytic oxidation (PCO)
- Plasma
- SOA, secondary organic aerosol
- SP, submicron particles
- SVOC, semi-volatile organic compound
- Sorption
- TCO, thermal catalytic oxidation
- TVOC, total volatile organic compound
- Thermal catalytic oxidation (TCO)
- UV-C, ultraviolet C, wavelength range: 280–100 nm
- UVGI, ultraviolet germicidal irradiation
- Ultraviolet germicidal irradiation (UVGI)
- VOC, volatile organic compound
- WHO, World Health Organization
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Affiliation(s)
- Yinping Zhang
- Institute of Built Environment, Department of Building Science, Tsinghua University, Beijing, China
| | - Jinhan Mo
- Institute of Built Environment, Department of Building Science, Tsinghua University, Beijing, China
- Department of Chemistry, Tsinghua University, Beijing, China
| | - Yuguo Li
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, SAR, China
| | - Jan Sundell
- Institute of Built Environment, Department of Building Science, Tsinghua University, Beijing, China
- International Center for Indoor Environment and Energy, Technical University of Denmark, Denmark
| | - Pawel Wargocki
- International Center for Indoor Environment and Energy, Technical University of Denmark, Denmark
| | - Jensen Zhang
- Department of Mechanical and Aerospace Engineering, Syracuse University, NY, USA
| | - John C. Little
- Department of Civil and Environmental Engineering, Virginia Tech., VA, USA
| | - Richard Corsi
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX, USA
| | - Qihong Deng
- School of Energy Science and Engineering, Central South University, Changsha, China
| | - Michael H.K. Leung
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, SAR, China
| | - Lei Fang
- International Center for Indoor Environment and Energy, Technical University of Denmark, Denmark
| | - Wenhao Chen
- Department of Mechanical and Aerospace Engineering, Syracuse University, NY, USA
| | - Jinguang Li
- Institute of Shanghai Building Science, Shanghai, China
| | - Yuexia Sun
- College of Engineering and Computer Science, The University of Texas at Tyler, 3900 University Blvd., Tyler, TX, USA
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Jo WK, Shin SH, Hwang ES. Removal of dimethyl sulfide utilizing activated carbon fiber-supported photocatalyst in continuous-flow system. JOURNAL OF HAZARDOUS MATERIALS 2011; 191:234-239. [PMID: 21592662 DOI: 10.1016/j.jhazmat.2011.04.069] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 04/12/2011] [Accepted: 04/16/2011] [Indexed: 05/30/2023]
Abstract
The present study investigated the adsorptional photocatalytic decomposition (APD) efficiency of activated carbon fiber-supported TiO(2) (ACF/TiO(2)) in a continuous-flow reactor for the removal of dimethyl sulfide (DMS). The SEM analysis identified that the ACF/TiO(2) exhibited the same tridimensional shape as uncovered ACF and that a TiO(2) photocatalyst could be embedded in the surface of the ACF. In the absence of UV light, the time-series removal efficiencies by ACF and the ACF/TiO(2) units exhibited a similar pattern, which decreased gradually as it reached close to zero. However, the APD efficiency determined via the ACF/TiO(2) with UV light remained at nearly 60% during the remaining courses of the 13-h period, after decreasing from a maximum APD of 80%. The APD efficiencies depended upon the weights of the TiO(2) embedded into the ACFs, the UV sources, the relative humidity, and DMS input concentrations. During a long-term (219-h) APD test, the APD efficiencies dropped from 80% to ca 60% within 1h after the initiation of the APD process and then fluctuated between 52% and 60%. No byproducts were measurable or observable in the effluent gas or on the ACF/TiO(2) surface. Consequently, the continuous-flow ACF/TiO(2) system could effectively be applied to control DMS without any significant functional deterioration.
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Affiliation(s)
- W K Jo
- Department of Environmental Engineering, Kyungpook National University, Daegu, Republic of Korea.
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43
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Modelling of an annular photocatalytic reactor. REACTION KINETICS MECHANISMS AND CATALYSIS 2011. [DOI: 10.1007/s11144-011-0299-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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44
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Li X, Zhu Z, Zhao Q, Wang L. Photocatalytic degradation of gaseous toluene over ZnAl2O4 prepared by different methods: a comparative study. JOURNAL OF HAZARDOUS MATERIALS 2011; 186:2089-2096. [PMID: 21242028 DOI: 10.1016/j.jhazmat.2010.12.111] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 12/22/2010] [Accepted: 12/23/2010] [Indexed: 05/30/2023]
Abstract
The development of a "green" treatment process for typical indoor pollutants such as toluene is greatly desirable. In this study, ZnAl(2)O(4) nanoparticles were prepared via three different routes, i.e., solvothermal, citrate precursor and hydrothermal methods. Their structural properties were systematically investigated by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), energy-dispersive X-ray spectra (EDX), Brunauer-Emmett-Teller (BET), UV-vis diffuse reflectance spectroscopy (DRS), and Fourier transform infrared spectroscopy (FT-IR) techniques. The photo-induced charge separation in the samples was demonstrated by surface photovoltage (SPV) measurement. The photocatalytic performances of the ZnAl(2)O(4) samples and nanostructured TiO(2) samples were comparatively studied by the degradation of gaseous toluene under UV lamp irradiation in in situ FTIR reactor. The results indicated that the sample synthesized by facile solvothermal method exhibited about 90% photocatalytic efficiency of toluene. The toluene was mineralized into carbon dioxide and water as the major species. The photocatalytic oxidation of gaseous pollutant over UV-illuminated ZnAl(2)O(4) is a promising technique for air purification.
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Affiliation(s)
- Xinyong Li
- Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science & Technology, Dalian University of Technology, Dalian 116024, China.
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45
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Preparation of TiO2 ultrafine nanopowder with large surface area and its photocatalytic activity for gaseous nitrogen oxides. POWDER TECHNOL 2011. [DOI: 10.1016/j.powtec.2010.09.035] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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46
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Chen JM, Cheng ZW, Jiang YF, Zhang LL. Direct VUV photodegradation of gaseous α-pinene in a spiral quartz reactor: intermediates, mechanism, and toxicity/biodegradability assessment. CHEMOSPHERE 2010; 81:1053-1060. [PMID: 20965544 DOI: 10.1016/j.chemosphere.2010.09.060] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2010] [Revised: 09/20/2010] [Accepted: 09/20/2010] [Indexed: 05/30/2023]
Abstract
Photodegradation of gaseous α-pinene by a vacuum ultraviolet (VUV) in a spiral reactor was investigated under various gaseous reaction media and residence time, and their respective effects on types and biodegradability of the intermediates were studied. Analysis of carbon amounts showed that about 33% and 43% of total carbon were converted to soluble organic carbon in the air medium with a relative humidity (RH) of 35-40% at empty bed residence times (EBRTs) of 18 and 45 s. Based on the identified intermediates by GC/MS and IC, a photodegradation pathway was proposed by the combined roles of photolysis, OH. photooxidation and O₃ photooxidation. Biodegradability to active sludge, toxicity to Chlorella vulgaris and 96-well microplates showed that α-pinene could be largely converted to more biodegradable and less toxic compounds through photodegradation in the air reaction medium with a RH of 35-40% at an EBRT of 18s, in which the initial concentration was 600 mg m⁻³. Therefore, VUV photodegradation could be applied as an effective pre-treatment method for detoxification and biodegradability improvement under the optimized photodegradation conditions. Such results supported the potential use of VUV photodegradation to improve the removal capacity of conventional biological treatments for hydrophobic and poorly biodegradable compounds.
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Affiliation(s)
- Jian-Meng Chen
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China
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47
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Sekiguchi K, Noshiroya D, Handa M, Yamamoto K, Sakamoto K, Namiki N. Degradation of organic gases using ultrasonic mist generated from TiO2 suspension. CHEMOSPHERE 2010; 81:33-38. [PMID: 20705323 DOI: 10.1016/j.chemosphere.2010.07.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 07/09/2010] [Accepted: 07/12/2010] [Indexed: 05/29/2023]
Abstract
The photocatalytic degradation of organic gases with mist particles that were formed by ultrasonic atomization of a TiO(2) suspension was performed with three different ultraviolet light sources. Three aromatic volatile organic compounds (VOCs; toluene, p-xylene, and styrene) and aldehydes (formaldehyde and acetaldehyde) were chosen as model organic gases for the degradation experiment. Under UV(365) irradiation, toluene was decomposed by a photocatalytic reaction on the surface of mist particles. Under UV(254+185) irradiation, the removal efficiency and mineralization ratio of the VOC gases were higher than those under UV(365) or UV(254) irradiation. Under UV(254+185) irradiation, it was found that VOC gases were immediately degraded and converted to water-soluble intermediates by not only direct photolysis but also oxidation by OH radical, since the removal efficiency of several organic gases depended on the reaction rate with OH radical and the primary effect of generated ozone was to complete the mineralization of the intermediates. On the other hand, water-soluble aldehyde gases were rapidly trapped by mist particles before reaction on their surface. Furthermore, water-soluble intermediates that formed via the decomposition of VOC gases were completely trapped in the mist and were not detected at the reactor exit. Therefore, notable secondary particle generation was not observed, even under UV(254+185) irradiation. Based on these results as well as the size distribution of the mist droplets, it was found that primarily submicron-scale droplets contributed to the photocatalytic reaction. Lastly, we propose a mechanism for the degradation of organic gaseous pollutants on the surface of mist particles.
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Affiliation(s)
- Kazuhiko Sekiguchi
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan.
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48
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Li Y, Huang J, Peng T, Xu J, Zhao X. Photothermocatalytic Synergetic Effect Leads to High Efficient Detoxification of Benzene on TiO2 and Pt/TiO2 Nanocomposite. ChemCatChem 2010. [DOI: 10.1002/cctc.201000085] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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49
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Glajar IC, Moldovan Z. Photodegradation of the indoor organic pollutants by UV irradiation using TiO2catalysts. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/182/1/012039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Wang T, Jiang X, Wu Y. Influence of Crystallization of Nano TiO2 Prepared by Adsorption Phase Synthesis on Photodegradation of Gaseous Toluene. Ind Eng Chem Res 2009. [DOI: 10.1021/ie801974y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ting Wang
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xin Jiang
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yanxiang Wu
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
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