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Wang T, Liu Y, Deng Y, Cheng H, Yang Y, Zhang L. Photochemical reaction of NO2 on photoactive mineral dust: Mechanism and irradiation intensity dependence. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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2
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Chen J, Yi J, Ji Y, Zhao B, Ji Y, Li G, An T. Enhanced H-abstraction contribution for oxidation of xylenes via mineral particles: Implications for particulate matter formation and human health. ENVIRONMENTAL RESEARCH 2020; 186:109568. [PMID: 32344213 DOI: 10.1016/j.envres.2020.109568] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 03/23/2020] [Accepted: 04/20/2020] [Indexed: 06/11/2023]
Abstract
Xylenes are important aromatic hydrocarbons having broad industrial emissions and profound implication to air quality and human health. Generally, homogeneous atmospheric oxidation of xylenes is initiated by hydroxyl radical (OH) resulting in minor H-abstraction and major OH-addition pathways. However, the effect of mineral particles on the homogeneous atmospheric oxidation mechanism of xylenes is still not well understood. In the present study, the heterogeneous atmospheric oxidation of xylenes on mineral particles (TiO2) is examined in detail. Both the experimental data and theoretical calculations are combined to achieve the feast. The experimental results detected a major H-abstraction (≥87.18%) and minor OH-addition (≤12.82%) pathways for the OH-initiated heterogeneous oxidation of three xylenes on TiO2 under ultraviolet (UV) irradiation. Theoretical calculations demonstrated favorable H-abstraction on methyl group of xylenes by surface OH with large exothermic energies, because of the reason that their methyl group rather than the phenyl ring is more occupied by TiO2 via hydrogen bonding. Furthermore, the particle monitor and acute risk assessment results indicated that the H-abstraction products significantly enhance the formation of particulate matter and health risk to human beings. Taken together, these results indicate that the atmospheric oxidation mechanism of xylenes is altered in the presence of mineral particles, highlighting the necessity to re-evaluate its implication in the environment and human health.
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Affiliation(s)
- Jiangyao Chen
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China; Synergy Innovation Institute of GDUT, Shantou, 515041, China
| | - Jiajing Yi
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yuemeng Ji
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Baocong Zhao
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yongpeng Ji
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Guiying Li
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China; Synergy Innovation Institute of GDUT, Shantou, 515041, China
| | - Taicheng An
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
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Vandenbroucke SST, Levrau E, Minjauw MM, Van Daele M, Solano E, Vos R, Dendooven J, Detavernier C. Study of the surface species during thermal and plasma-enhanced atomic layer deposition of titanium oxide films using in situ IR-spectroscopy and in vacuo X-ray photoelectron spectroscopy. Phys Chem Chem Phys 2020; 22:9262-9271. [DOI: 10.1039/d0cp00395f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
By the powerful combination of in situ FTIR and in vacuo XPS, the surface species during ALD of TDMAT with different reactants could be identified.
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Affiliation(s)
| | - Elisabeth Levrau
- Department of Solid State Sciences
- CoCooN group
- Ghent University
- 9000 Gent
- Belgium
| | - Matthias M. Minjauw
- Department of Solid State Sciences
- CoCooN group
- Ghent University
- 9000 Gent
- Belgium
| | - Michiel Van Daele
- Department of Solid State Sciences
- CoCooN group
- Ghent University
- 9000 Gent
- Belgium
| | - Eduardo Solano
- Department of Solid State Sciences
- CoCooN group
- Ghent University
- 9000 Gent
- Belgium
| | - Rita Vos
- Interuniversity Micro Electronics Center (IMEC)
- 3001 Heverlee
- Belgium
| | - Jolien Dendooven
- Department of Solid State Sciences
- CoCooN group
- Ghent University
- 9000 Gent
- Belgium
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Formation of CeMnxOy/OMS-2 nanocomposite significantly enhances UV–vis-infrared light-driven catalytic activity. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.07.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Yu L, Wang L, Sun X, Ye D. Enhanced photocatalytic activity of rGO/TiO 2 for the decomposition of formaldehyde under visible light irradiation. J Environ Sci (China) 2018; 73:138-146. [PMID: 30290862 DOI: 10.1016/j.jes.2018.01.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 01/17/2018] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
Due to the low concentration of indoor air contaminants, photocatalytic technology shows low efficiency for indoor air purification. The application of TiO2 for photocatalytic removal of formaldehyde is limited, because TiO2 can only absorb ultraviolet (UV) light. Immobilization of TiO2 nanoparticles on the surface of graphene can improve the visible light photocatalytic activity and the adsorption capacity. In this study, rGO (reduced graphene oxide)/TiO2 was synthesized through a hydrothermal method using titanium tetrabutoxide and graphene oxide as precursors, and was used for the degradation of low concentration formaldehyde in indoor air under visible light illumination. Characterization of the crystalline structure and morphology of rGO/TiO2 revealed that most GO was reduced to rGO during the hydrothermal treatment, and anatase TiO2 nanoparticles (with particle size of 15-30nm) were dispersed well on the surface of the rGO sheets. rGO/TiO2 exhibited excellent photocatalytic activity for degradation of formaldehyde in indoor air and this can be attributed to the role of rGO, which can act as the electron sink and transporter for separating photo-generated electron-hole pairs through interfacial charge transfer. Furthermore, rGO could adsorb formaldehyde molecules from air to produce a high concentration of formaldehyde on the surface of rGO/TiO2. Under visible light irradiation for 240min, the concentration of formaldehyde could be reduced to 58.5ppbV. rGO/TiO2 showed excellent moisture-resistance behavior, and after five cycles, rGO/TiO2 maintained high photocatalytic activity for the removal of formaldehyde (84.6%). This work suggests that the synthesized rGO/TiO2 is a promising photocatalyst for indoor formaldehyde removal.
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Affiliation(s)
- Lian Yu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - Long Wang
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Xibo Sun
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Daiqi Ye
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, South China University of Technology, Guangzhou 510006, China
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Zhu X, Pei L, Zhu R, Jiao Y, Tang R, Feng W. Preparation and characterization of Sn/La co-doped TiO 2 nanomaterials and their phase transformation and photocatalytic activity. Sci Rep 2018; 8:12387. [PMID: 30120255 PMCID: PMC6098047 DOI: 10.1038/s41598-018-30050-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/23/2018] [Indexed: 11/30/2022] Open
Abstract
The pure, tin (Sn)-doped, lanthanum (La)-doped and Sn/La co-doped titanium dioxide (TiO2) nanomaterials were synthesized using sol-gel method followed by calcination at the temperature of 360 °C, 450 °C and 600 °C, respectively. The structures of the nanomaterials were characterized by X-ray diffraction (XRD), Thermogravimetric (TG), Differential Thermal Analysis (DTA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectrum (EDS), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectrum (XPS), Diffuse Reflectance Spectrum (DRS), Photoluminescence Spectrum (PL), Brunauer-Emmett-Teller Measurements (BET), respectively. The photocatalytic property of the photocatalysts under UV light was evaluated through the degradation of Rhodamine B (RhB). The results show that the anatase-rutile phase transition is promoted by Sn-doping while La-doping retards the phase transition. However, La doping plays a major role in the process of phase transformation. The photocatalytic activity of pure TiO2 is affected by annealing temperature remarkably and the optimal annealing temperature is 450 °C. The photocatalytic activity of TiO2 is enhanced significantly by Sn and La doping at three different temperatures. Sn/La-TiO2 exhibits the highest degradation rates and the fastest reaction rates probably owing to the synergistic effect of Sn4+ and La3+ ions in inhibiting the recombination of photogenerated electron-hole pairs. The formation of extra surface hydroxyl groups and additional surface area are also beneficial for the photocatalytic activity.
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Grants
- the Open Research Subject of Powder Metallurgy Engineering Technology Research Center of Sichuan Province, China (grant no. SC-FMYJ2017-03, SC-FMYJ2017-05), the Applied Basic Research Programs of Sichuan province, China (grant no. 2018JY0062), the Soft Science Project of Chengdu, China (grant no. 2016-RK00-00044-ZF), the National Natural Science Research Foundation of China (grant no. 11572057), the Open Research Subject of Key Laboratory of Special Material and Preparation Technology of Sichuan Province, China (grant no.szjj2017-062), the Training Program for Innovation of Chengdu University, China (grant no.CDU-CX-2018001, CDU-CX-2018003)
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Affiliation(s)
- Xiaodong Zhu
- College of Mechanical Engineering, Chengdu University, Chengdu, 610106, China.
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China.
- Sichuan Engineering Research Center for Powder Metallurgy, Chengdu University, Chengdu, 610106, China.
| | - Lingxiu Pei
- College of Mechanical Engineering, Chengdu University, Chengdu, 610106, China
| | - Ranran Zhu
- College of Mechanical Engineering, Chengdu University, Chengdu, 610106, China
| | - Yu Jiao
- College of Science, Xichang University, Xichang, 615013, China
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China
| | - Renyong Tang
- College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, 610106, China
| | - Wei Feng
- College of Mechanical Engineering, Chengdu University, Chengdu, 610106, China.
- Sichuan Engineering Research Center for Powder Metallurgy, Chengdu University, Chengdu, 610106, China.
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He H, Peng X, Yu Y, Shi Z, Xu M, Ni S, Gao Y. Photochemical Vapor Generation of Tellurium: Synergistic Effect from Ferric Ion and Nano-TiO 2. Anal Chem 2018; 90:5737-5743. [PMID: 29611418 DOI: 10.1021/acs.analchem.8b00022] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Photochemical vapor generation (PVG) is emerging as a promising analytical tool for Te determination, thanks to its efficient matrix separation, and simple and green procedure. However, the low PVG generation efficiency of Te is the bottleneck for its wide application in environmental samples containing trace Te. Herein, we reported a high efficient PVG for Te determination by synergistic effect of ferric ion and nano-TiO2. The analytical sensitivity was enhanced approximately 15-fold for Te(IV) in the presence of both ferric ions and nano-TiO2, comparing to conventional PVG. Besides, the use of nano-TiO2 can provide Te(VI) and Te(IV) an equal and high PVG efficiency in the presence of ferric ions, owned to the high photocatalytic performance of TiO2 under short-wavelength UV irradiation (254 and 185 nm). Under the optimized experimental conditions, a detection limit of 1.0 ng L-1 was obtained. The precision of replicate measurements was 2.3% (RSD, n = 7) at 0.5 μg L-1 for Te(IV). The methodology was validated by successful determination of Te in surface waters and two standard reference sediment samples. To our best knowledge, this is the first report of the synergistic enhancement of transitional metal ions and nano-TiO2 in PVG, which possesses potential for highly sensitive determination of vapor-forming elements.
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