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Rychtowski P, Paszkiewicz O, Román-Martínez MC, Lillo-Ródenas MÁ, Markowska-Szczupak A, Tryba B. Impact of TiO 2 Reduction and Cu Doping on Bacteria Inactivation under Artificial Solar Light Irradiation. Molecules 2022; 27:molecules27249032. [PMID: 36558165 PMCID: PMC9784163 DOI: 10.3390/molecules27249032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022] Open
Abstract
Preparation of TiO2 using the hydrothermal treatment in NH4OH solution and subsequent thermal heating at 500-700 °C in Ar was performed in order to introduce some titania surface defects. The highest amount of oxygen vacancies and Ti3+ surface defects were observed for a sample heat-treated at 500 °C. The presence of these surface defects enhanced photocatalytic properties of titania towards the deactivation of two bacteria species, E. coli and S. epidermidis, under artificial solar lamp irradiation. Further modification of TiO2 was targeted towards the doping of Cu species. Cu doping was realized through the impregnation of the titania surface by Cu species supplied from various copper salts in an aqueous solution and the subsequent heating at 500 °C in Ar. The following precursors were used as a source of Cu: CuSO4, CuNO3 or Cu(CH3COO)2. Cu doping was performed for raw TiO2 after a hydrothermal process with and without NH4OH addition. The obtained results indicate that Cu species were deposited on the titania surface defects in the case of reduced TiO2, but on the TiO2 without NH4OH modification, Cu species were attached through the titania adsorbed hydroxyl groups. Cu doping on TiO2 increased the absorption of light in the visible range. Rapid inactivation of E. coli within 30 min was obtained for the ammonia-reduced TiO2 heated at 500 °C and TiO2 doped with Cu from CuSO4 solution. Photocatalytic deactivation of S. epidermidis was greatly enhanced through Cu doping on TiO2. Impregnation of TiO2 with CuSO4 was the most effective for inactivation of both E. coli and S. epidermidis.
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Affiliation(s)
- Piotr Rychtowski
- Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70–322 Szczecin, Poland
- Correspondence:
| | - Oliwia Paszkiewicz
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, Piastów 42, 71–065 Szczecin, Poland
| | - Maria Carmen Román-Martínez
- Department of Inorganic Chemistry and Materials Institute (IUMA), Faculty of Sciences, University of Alicante, Carretera de San Vicente del Raspeig s/n, 03690 Alicante, Spain
| | - Maria Ángeles Lillo-Ródenas
- Department of Inorganic Chemistry and Materials Institute (IUMA), Faculty of Sciences, University of Alicante, Carretera de San Vicente del Raspeig s/n, 03690 Alicante, Spain
| | - Agata Markowska-Szczupak
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, Piastów 42, 71–065 Szczecin, Poland
| | - Beata Tryba
- Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70–322 Szczecin, Poland
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2
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Possetto D, Gambetta C, Gatica E, Montaña MP, Porcal GV, Massad W, Natera J. Photocatalytic evaluation and characterization of TiO2-riboflavin phosphate film: analysis of reactive oxygen species. Photochem Photobiol Sci 2022; 22:513-524. [PMID: 36308632 DOI: 10.1007/s43630-022-00331-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 10/20/2022] [Indexed: 04/18/2023]
Abstract
The effect of Riboflavin-5'-phosphate (RFPO4) sensitization on photocatalytic properties of TiO2 film was studied. RFPO4 was adsorbed on film surface to investigate the photophysical properties of TiO2 upon blue-light photoexcitation. The film was characterized through scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, and diffuse reflectance spectroscopy. The efficiency of the TiO2/RFPO4 film was tested for pollutant elimination in aqueous media in a visible-light-driven system. The phenol paradigmatic model was employed in an aqueous solution as a contaminant target. TiO2/RFPO4 sensitized photodegradation of phenol, which produces catechol, hydroquinone, and benzophenone, was monitored by absorption spectroscopy and HPLC. The results indicated that phenol degradation with TiO2/RFPO4 film was due to the photogeneration of two reactive oxygen species, singlet molecular oxygen (O2(1Δg)) and superoxide radical anion (O2·-) identified through specific detection techniques. The presence of O2(1Δg) is reported here for the first time as generated from a sensitized TiO2 film upon visible-light photoirradiation. Based on the photophysical determinations, a photocatalytic mechanism for TiO2/RFPO4 was established.
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Qiao Q, Chen Y, Wang Y, Ren Y, Cao J, Huang F, Bian Z. Surface modification of phosphate ion to promote photocatalytic recovery of precious metals. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.03.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Benbow NL, Rozenberga L, McQuillan AJ, Krasowska M, Beattie DA. ATR FTIR Study of the Interaction of TiO 2 Nanoparticle Films with β-Lactoglobulin and Bile Salts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13278-13290. [PMID: 34731567 DOI: 10.1021/acs.langmuir.1c01830] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The technique of in situ particle film attenuated total reflection Fourier transform infrared spectroscopy (ATR FTIR) has been used to probe the adsorption and coadsorption (sequential) of a common food protein (β-lactoglobulin, BLG) and two representative bile salts (taurocholic acid and glycocholic acid, abbreviated as TCA and GCA) onto the surface of titanium dioxide (TiO2) nanoparticles. Evaluating of binding interactions between commonly used (historically now, in some countries) food additives and food components, as well as the body's own digestion chemicals, is a critical step in understanding the role of colloidal phenomena in digestion and bioavailability. TCA is found to adsorb onto TiO2 but without any significant ability to be retained when it is not present in the aqueous phase. GCA is also found to adsorb via two distinct binding mechanisms, with one type of adsorbed species being resistant to removal. BLG adsorbs, is irreversibly bound, and has altered conformation when adsorbed at pH 2 (stomach conditions) to the conformation when adsorbed at pH 6.5 (small intestine conditions). This altered conformation is not interface-dependent and is mirrored in the solution spectra of BLG. Sequential coadsorption studies indicate that TCA and GCA adsorb onto TiO2 nanoparticle surfaces and display similar degrees of reversibility and binding in the presence or absence of preadsorbed BLG.
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Affiliation(s)
- N L Benbow
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - L Rozenberga
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - A James McQuillan
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
| | - M Krasowska
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - D A Beattie
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
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6
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Kato CN, Kubota T, Aono K, Ozawa N. Two Tungstates Containing Platinum Nanoparticles Prepared by Air-Calcining Keggin-Type Polyoxotungstate-Coordinated Diplatinum(II) Complexes: Effect on Sintering-Resistance and Photocatalysis. Catal Letters 2021. [DOI: 10.1007/s10562-021-03843-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractTwo tungstates containing platinum nanoparticles (Pt Npts) were obtained by air-calcining α-Keggin-type diplatinum(II)-coordinated polyoxotungstates, Cs3[α-PW11O39{cis-Pt(NH3)2}2]⋅8H2O (Cs-P-Pt) and Cs4[α-SiW11O39{cis-Pt(NH3)2}2]⋅11H2O (Cs-Si-Pt), at 700–900 °C for 5 h. The polyoxotungstate Cs-P-Pt was transformed to a mixture of Pt Npts and Cs3PW12O40 upon calcination, while the Cs-Si-Pt structures were transformed to Pt Npts and Cs4W11O35. The Pt Npts generated by air-calcining Cs-P-Pt at 700 °C for 5 h were uniform with an average particle size of 3.6 ± 1.1 nm, which was much smaller than that of the Pt Npts obtained by calcining Cs-Si-Pt (19.9 ± 9.9 nm) under identical conditions. This demonstrated the significant inhibitory effect of Cs-P-Pt on aggregation during high-temperature air-calcination at a high platinum content (10.6 wt.%) and in the absence of a support. During calcination at 700–900 °C, Cs-P-Pt exhibited higher activities than Cs-Si-Pt with respect to hydrogen evolution from aqueous triethanolamine solutions under visible light irradiation in the presence of Eosin Y, α-Keggin-type mono-aluminum-substituted polyoxotungstate, and titanium dioxide. When Cs-P-Pt was calcined at 800 °C for 100 h, no decrease in activity was observed in comparison with that upon calcination for 5 h.
Graphical Abstract
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7
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Zheng N, He X, Guo W, Hu Z. Enhancement of mass transfer efficiency and photoelectrochemical activity for TiO2 nanorod arrays by decorating Ni3+-states functional NiO water oxidation cocatalyst. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.10.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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8
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Zhu Z, Yu J. Combination of microwave discharge electrodeless lamp and a TiO 2/HZSM-5 composite for the photocatalytic degradation of dimethyl sulphide. ENVIRONMENTAL RESEARCH 2021; 197:111082. [PMID: 33812875 DOI: 10.1016/j.envres.2021.111082] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 03/06/2021] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
In this study, an integrated photocatalytic system consisting of a microwave discharge electrodeless lamp (MDEL) and TiO2/HZSM-5 was established to investigate the intensified degradation of dimethyl sulphide (DMS). The system targets optimisation of the reactive oxygen species (ROS) and photocatalytic degradation pathways without catalyst deactivation. TiO2/HZSM-5, containing highly dispersed TiO2 nanoparticles, was prepared through the sol-gel method. TiO2/HZSM-5 exhibits strong acidity and can adsorb DMS in multiple adsorption forms. Thus, the adsorption capacity of TiO2/HZSM-5 is 20 and 53 times higher than that of Aeroxide TiO2 (P25) in dry and highly humid air, respectively. UV-Vis analysis was performed to investigate the ROS in the gas phase. The results show that the concentrations of the ROS increased by 8% and 62.7% in dry and highly humid air, respectively. 1O2 and O (1D), as well as ·OH are the major ROS, accounting for 73.6% and 61.6% in dry and highly humid air, respectively. A total of 92.5% DMS was removed over 600 min in dry air. Microwaves have strong desorption effects on absorbed substances, promoting the degradation of DMS via ROS in the gas phase. Moreover, 1O2, O (1D), and ·OH can mineralise more DMS molecules into SO2 and SO3 through methanesulfonic acid. The highest mineralisation rate of 89.48% was obtained at 90% humidity over 600 min without catalyst deactivation. Therefore, this integrated system induced by microwave radiation can improve ROS production and prevent catalyst deactivation, providing an alternative to achieve higher photocatalytic performances in dry and highly humid air.
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Affiliation(s)
- Zhen Zhu
- Suzhou Institute of Trade and Commerce, 287 Xuefu Road, Suzhou, 215009, China; Research Center of Environmental Catalysis & Separation Process, Beijing Key Laboratory of Energy Environmental Catalysis, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Jiang Yu
- Research Center of Environmental Catalysis & Separation Process, Beijing Key Laboratory of Energy Environmental Catalysis, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China; Institute of Anqing, Beijing University of Chemical Technology, Anqing, 410205, PR China.
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9
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Yang H, Yang Y, Jiang L, Wang Y, Chen Y, He J, Wang W, Wang J. Photocatalytic reduction of Cr(VI) within mesoporous TiO
2
templated and confined with chlorophyll. NANO SELECT 2021. [DOI: 10.1002/nano.202100070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Haiyan Yang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Yepeng Yang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Liang Jiang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Yuanfeng Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Yongjuan Chen
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Jiao He
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Wei Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
| | - Jiaqiang Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, School of Chemical Sciences and Technology Yunnan University Kunming China
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One-step bulk and surface co-modification of LiNi0.8Co0.15Al0.05O2 cathode material towards excellent long-term cyclability. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Isolation Strategy towards Earth-Abundant Single-Site Co-Catalysts for Photocatalytic Hydrogen Evolution Reaction. Catalysts 2021. [DOI: 10.3390/catal11040417] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Achieving efficient photocatalytic water splitting remains one of the most vital challenges in the photocatalysis field, as the performance of contemporary heterogeneous catalysts is still limited by their insufficient activity and low predictability. To address this challenge, this work takes inspiration from the concept of heterogeneous single-metal-site catalysts (HSMSCs) and follows the idea of site-isolation, aiming towards single-site co-catalyst species and a higher atom-utilization efficiency. We synthesized a set of photocatalysts through an adsorption-limited wet impregnation process using bare and phosphate-modified TiO2 as model supports and earth-abundant metals (Cu and Ni) with various loadings (0.008–5 wt.%) as co-catalyst species. The catalysts are characterized by TXRF for the determination of the real co-catalyst loadings, UV-vis and FTIR spectroscopes for semi-quantitative analysis of the metal state and binding modes to the substrate, and HRTEM for resolving the morphology of the sample’s surface. All samples were then evaluated towards the photocatalytic hydrogen evolution reaction (HER). We show that much higher turnover frequencies (TOFs) are obtained for both Cu- and Ni-based systems when lower co-catalyst loadings are used, which indicates an improved atom-utilization efficiency that reaches performances comparable to the noble Au co-catalyst. We also introduce a structural model to explain the observed TOF trends, which confirms that both earth-abundant systems undergo a strong structural reconstruction upon site-isolation towards smaller, perhaps even single-site-like species.
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12
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Lan Y, Kang S, Cui D, Hu Z. A High-Efficiency Hematite Photoanode with Enhanced Bonding Energy Around Fe Atoms. Chemistry 2021; 27:4089-4097. [PMID: 33242224 DOI: 10.1002/chem.202004569] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/12/2020] [Indexed: 01/20/2023]
Abstract
Hematite nanoarrays are important photoanode materials. However, they suffer from serious problems of charge transfer and surface states; in particular, the surface states hinder the increase in photocurrent. A previous strategy to suppress the surface state is the deposition of an Fe-free metal oxide overlayer. Herein, from the viewpoint of atomic bonding energy, it is found that the strength of bonding around Fe atoms in the hematite is the key to suppressing the surface states. By treating the surface of hematite with Se and NaBH4 , the Fe2 O3 transforms to a double-layer nanostructure. In the outer layer, the Fe-O bonding is reinforced and the Fe-Se bonding is even stronger. Therefore, the surface states are inhibited and the increase in the photocurrent density becomes much faster. Besides, the treatment constructs a nanoscale p-n junction to promote the charge transfer. Improvements are achieved in onset potential (0.25 V shift) and in photocurrent density (5.8 times). This work pinpoints the key to suppressing the surface states and preparing a high-efficiency hematite nanoarray, and deepens our understanding of hematite photoanodes.
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Affiliation(s)
- Yangchun Lan
- School of Microelectronics, Southern University of Science, and Technology, Shenzhen, 518055, P. R. China
| | - Shuai Kang
- Micro-nano Manufacturing and System Integration Center, Chongqing Institute of Green and Intelligent Technology (CIGIT), Chinese Academy of Sciences, Chongqing, 400714, P. R. China
| | - Dehu Cui
- School of Microelectronics, Southern University of Science, and Technology, Shenzhen, 518055, P. R. China
| | - Zhuofeng Hu
- School of Environmental Science and Engineering, Guangdong, Provincial Key Laboratory of, Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, 510275, P. R. China
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13
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Kato CN, Aono K, Kurihara A, Kubota T, Kasai R, Suzuki K. Thermal Treatment of a Keggin‐Type Diplatinum(II)‐Coordinated Polyoxotungstate: Formation of Hydrophilic Colloidal Particles and Photocatalytic Hydrogen Production. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000638] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Chika Nozaki Kato
- Department of Chemistry Faculty of Science Shizuoka University 836 Ohya Suruga‐ku Shizuoka 422‐8529 Japan
- Research Institute of Green Science and Technology Shizuoka University 836 Ohya Suruga‐ku Shizuoka 422‐8529 Japan
| | - Koki Aono
- Department of Chemistry Faculty of Science Shizuoka University 836 Ohya Suruga‐ku Shizuoka 422‐8529 Japan
| | - Akihiro Kurihara
- Department of Chemistry Faculty of Science Shizuoka University 836 Ohya Suruga‐ku Shizuoka 422‐8529 Japan
| | - Toshiya Kubota
- Department of Chemistry Faculty of Science Shizuoka University 836 Ohya Suruga‐ku Shizuoka 422‐8529 Japan
| | - Ryota Kasai
- Department of Chemistry Faculty of Science Shizuoka University 836 Ohya Suruga‐ku Shizuoka 422‐8529 Japan
| | - Kosuke Suzuki
- Department of Applied Chemistry School of Engineering The University of Tokyo 7-3–1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
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14
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Li Y, Yang T, Li H, Tong R, Peng S, Han X. Transformation of Fe-B@Fe into Fe-B@Ni for efficient photocatalytic hydrogen evolution. J Colloid Interface Sci 2020; 578:273-280. [DOI: 10.1016/j.jcis.2020.05.124] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/28/2020] [Accepted: 05/31/2020] [Indexed: 11/29/2022]
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15
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Liu X, Lv X, Lai H, Peng G, Yi Z, Li J. A Simple Ni‐based Metal–organic Framework as Catalyst for Dye‐sensitized Photocatalytic H
2
Evolution from Water Reduction. Photochem Photobiol 2020; 96:1169-1175. [DOI: 10.1111/php.13290] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 05/18/2020] [Indexed: 01/06/2023]
Affiliation(s)
- Xing Liu
- College of Chemistry and Materials Science Hengyang Normal University Hengyang China
- Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province Hengyang Normal University Hengyang China
| | - Xujiao Lv
- College of Chemistry and Materials Science Hengyang Normal University Hengyang China
| | - Hua Lai
- College of Chemistry and Materials Science Hengyang Normal University Hengyang China
- Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province Hengyang Normal University Hengyang China
| | - Gang Peng
- College of Chemistry and Materials Science Hengyang Normal University Hengyang China
- Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province Hengyang Normal University Hengyang China
| | - Zhengji Yi
- College of Chemistry and Materials Science Hengyang Normal University Hengyang China
- Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province Hengyang Normal University Hengyang China
| | - Junhua Li
- College of Chemistry and Materials Science Hengyang Normal University Hengyang China
- Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province Hengyang Normal University Hengyang China
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16
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Synthesis and Characterization of Novel Green Hybrid Nanocomposites for Application as Proton Exchange Membranes in Direct Borohydride Fuel Cells. ENERGIES 2020. [DOI: 10.3390/en13051180] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Organic–inorganic nanocomposite membranes for potential application in direct borohydride fuel cells (DBFCs) are formulated from sulfonated poly(vinyl alcohol) (SPVA) with the incorporation of (PO4-TiO2) and (SO4-TiO2) nanotubes as doping agents. The functionalization of PVA to SPVA was done by using a 4-sulfophthalic acid as an ionic crosslinker and sulfonating agent. Morphological and structural characterization by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) confirmed the successful synthesis of the doping agents and their incorporation into the polymer. The influence of PO4-TiO2 and SO4-TiO2 doping and their content on the physicochemical properties of the nanocomposite membranes was evaluated. Swelling degree and water uptake gradually reduced to 7% and 13%, respectively, with increasing doping agent concentration. Ion exchange capacity and ionic conductivity of the membrane with 3 wt.% doping agents were raised 5 and 7 times, respectively, compared to the undoped one. The thermal and oxidative stability and tensile strength also increased with the doping content. Furthermore, lower borohydride permeability (0.32 × 10−6 cm2 s−1) was measured for the membranes with higher amount of inorganic doping agents when compared to the undoped membrane (0.71 × 10−5 cm2 s−1) and Nafion®117 (0.40 × 10−6 cm2 s−1). These results pave the way for a green, simple and low-cost approach for the development of composite membranes for practical DBFCs.
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17
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Hao X, Guo Q, Li M, Jin Z, Wang Y. TiO2 as an interfacial-charge-transfer-bridge to construct eosin Y-mediated direct Z-scheme electron transfer over a Co9S8 quantum dot/TiO2 photocatalyst. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00893a] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A novel eosin Y-mediated Z-scheme Co9S8 QDs/TiO2 photocatalytic system was constructed and a high AQE of 37.4% is obtained at 470 nm for 20%Co9S8/TiO2 heterojunction.
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Affiliation(s)
- Xuqiang Hao
- School of Chemistry and Chemical Engineering
- Ningxia Key Laboratory of Solar Chemical Conversion Technology
- Key Laboratory for Chemical Engineering and Technology
- State Ethnic Affairs Commission
- North Minzu University
| | - Qingjie Guo
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering
- Ningxia University
- Yinchuan
- PR China
| | - Mei Li
- School of Chemistry and Chemical Engineering
- Ningxia Key Laboratory of Solar Chemical Conversion Technology
- Key Laboratory for Chemical Engineering and Technology
- State Ethnic Affairs Commission
- North Minzu University
| | - Zhiliang Jin
- School of Chemistry and Chemical Engineering
- Ningxia Key Laboratory of Solar Chemical Conversion Technology
- Key Laboratory for Chemical Engineering and Technology
- State Ethnic Affairs Commission
- North Minzu University
| | - Ying Wang
- School of Chemistry and Chemical Engineering
- Eco-materials and Renewable Energy Research Center (ERERC)
- National Laboratory of Solid State Microstructures
- Kunshan Innovation Institute of Nanjing University
- Nanjing University
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18
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Liu X, Zhao L, Lai H, Wei Y, Yang G, Yin S, Yi Z. Graphene decorated MoS2for eosin Y-sensitized hydrogen evolution from water under visible light. RSC Adv 2017. [DOI: 10.1039/c7ra09009a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
MoS2was modified with graphene (G) by a simple hydrothermal method. The eosin Y sensitized G/MoS2composite displays enhanced hydrogen evolution in terms of not only activity but also stability.
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Affiliation(s)
- Xing Liu
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- People's Republic of China
- Key Laboratory of Functional Organometallic Materials of College of Hunan Province
| | - Lanhua Zhao
- Institue of Pathogenic Biolog
- Hunan Provincical Key Laboratory for Special Pathogens Prevention and Control
- University of South China
- Hengyang
- People's Republic of China
| | - Hua Lai
- Key Laboratory of Functional Organometallic Materials of College of Hunan Province
- College of Chemistry and Material Science
- Hengyang Normal University
- Hengyang
- People's Republic of China
| | - Yanyan Wei
- Key Laboratory of Functional Organometallic Materials of College of Hunan Province
- College of Chemistry and Material Science
- Hengyang Normal University
- Hengyang
- People's Republic of China
| | - Guihua Yang
- Key Laboratory of Functional Organometallic Materials of College of Hunan Province
- College of Chemistry and Material Science
- Hengyang Normal University
- Hengyang
- People's Republic of China
| | - Shuangfeng Yin
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- People's Republic of China
| | - Zhengji Yi
- Key Laboratory of Functional Organometallic Materials of College of Hunan Province
- College of Chemistry and Material Science
- Hengyang Normal University
- Hengyang
- People's Republic of China
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Miroshnichenko O, Posysaev S, Alatalo M. A DFT study of the effect of SO 4 groups on the properties of TiO 2 nanoparticles. Phys Chem Chem Phys 2016; 18:33068-33076. [PMID: 27886298 DOI: 10.1039/c6cp05681d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a study of the optical, electronic, and structural properties of TiO2 anatase-structured nanoparticles upon adsorption of SO4 groups, which are always present on the surface of the particles during the sulfate manufacturing method. Structural and electronic properties were studied using the density functional theory method (DFT), and optical properties were obtained by time-dependent DFT. It was found that SO4 groups alter both the geometric and electronic structure of TiO2 nanoparticles and change the photoabsorption characteristics. In particular, we find that η2-O2 type O-O moieties are formed due to the adsorption of 3 and 4SO4 groups.
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Affiliation(s)
- Olga Miroshnichenko
- University of Oulu, Theoretical Physics Research Unit, PL 3000, FI-90014 Oulu, Finland. and Peter the Great St. Petersburg Polytechnic University, Department of Theoretical Mechanics, Polytechnicheskaya 29, 195251 St. Petersburg, Russian Federation
| | - Sergei Posysaev
- University of Oulu, Theoretical Physics Research Unit, PL 3000, FI-90014 Oulu, Finland. and Peter the Great St. Petersburg Polytechnic University, Department of Theoretical Mechanics, Polytechnicheskaya 29, 195251 St. Petersburg, Russian Federation
| | - Matti Alatalo
- University of Oulu, Theoretical Physics Research Unit, PL 3000, FI-90014 Oulu, Finland.
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Liu X, Li Y, Peng S, Lai H, Yi Z. Visible-light-driven hydrogen production in a dye sensitized polyoxometalate system without noble metals. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.03.054] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Hattori S, Ihara Y, Kato CN. A Novel Photocatalytic System Constructed Using Eosin Y, Titanium Dioxide, and Keggin-Type Platinum(II)- and Aluminum(III)-Coordinated Polyoxotungstates for Hydrogen Production from Water Under Visible Light Irradiation. Catal Letters 2015. [DOI: 10.1007/s10562-015-1574-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yu D, Bai J, Liang H, Wang J, Li C. A new fabrication of AgX (X = Br, I)–TiO2 nanoparticles immobilized on polyacrylonitrile (PAN) nanofibers with high photocatalytic activity and renewable property. RSC Adv 2015. [DOI: 10.1039/c5ra19235h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
AgX–TiO2/PAN (X = Br, I) photocatalyst was synthesized by the electrospinning technique, solvothermal synthesis, physical adsorption and gas/solid reaction.
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Affiliation(s)
- Dandan Yu
- Chemical Engineering College
- Inner Mongolia University of Technology
- Huhhot 010051
- People's Republic of China
| | - Jie Bai
- Chemical Engineering College
- Inner Mongolia University of Technology
- Huhhot 010051
- People's Republic of China
| | - Haiou Liang
- Chemical Engineering College
- Inner Mongolia University of Technology
- Huhhot 010051
- People's Republic of China
| | - Junzhong Wang
- Chemical Engineering College
- Inner Mongolia University of Technology
- Huhhot 010051
- People's Republic of China
| | - Chunping Li
- Chemical Engineering College
- Inner Mongolia University of Technology
- Huhhot 010051
- People's Republic of China
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Kumari A, Mondal I, Pal U. A simple carbazole based sensitizer attached to a Nafion-coated-TiO2 photocatalyst: the impact of controlling parameters towards visible light driven H2 production. NEW J CHEM 2015. [DOI: 10.1039/c4nj01436g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A close neighborhood of TiO2, Nafion and sensitizer components developed by easy fabrication favors synergistic photon-to-hydrogen efficiency in photocatalytic H2 evolution.
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Affiliation(s)
- Amritanjali Kumari
- Department of Chemistry and Biomimetics
- CSIR-Central Mechanical Engineering Research Institute
- Durgapur-713209
- India
| | - Indranil Mondal
- Department of Chemistry and Biomimetics
- CSIR-Central Mechanical Engineering Research Institute
- Durgapur-713209
- India
| | - Ujjwal Pal
- Department of Chemistry and Biomimetics
- CSIR-Central Mechanical Engineering Research Institute
- Durgapur-713209
- India
- India Network Institute of Solar Energy
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24
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Zhang W, Li Y, Peng S, Cai X. Enhancement of photocatalytic H2 evolution of eosin Y-sensitized reduced graphene oxide through a simple photoreaction. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:801-811. [PMID: 24991517 PMCID: PMC4077509 DOI: 10.3762/bjnano.5.92] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Accepted: 05/05/2014] [Indexed: 05/30/2023]
Abstract
A graphene oxide (GO) solution was irradiated by a Xenon lamp to form reduced graphene oxide (RGO). After irradiation, the epoxy, the carbonyl and the hydroxy groups are gradually removed from GO, resulting in an increase of sp(2) π-conjugated domains and defect carbons with holes for the formed RGO. The RGO conductivity increases due to the restoration of sp(2) π-conjugated domains. The photocatalytic activity of EY-RGO/Pt for hydrogen evolution was investigated with eosin Y (EY) as a sensitizer of the RGO and Pt as a co-catalyst. When the irradiation time is increased from 0 to 24 h the activity rises, and then reaches a plateau. Under optimum conditions (pH 10.0, 5.0 × 10(-4) mol L(-1) EY, 10 μg mL(-1) RGO), the maximal apparent quantum yield (AQY) of EY-RGO24/Pt for hydrogen evolution rises up to 12.9% under visible light irradiation (λ ≥ 420 nm), and 23.4% under monochromatic light irradiation at 520 nm. Fluorescence spectra and transient absorption decay spectra of the EY-sensitized RGO confirm that the electron transfer ability of RGO increases with increasing irradiation time. The adsorption quantity of EY on the surface of RGO enhances, too. The two factors ultimately result in an enhancement of the photocatalytic hydrogen evolution over EY-RGO/Pt with increasing irradiation time. A possible mechanism is discussed.
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Affiliation(s)
- Weiying Zhang
- Department of Chemistry, Nanchang University, Nanchang 330031, China
| | - Yuexiang Li
- Department of Chemistry, Nanchang University, Nanchang 330031, China
| | - Shaoqin Peng
- Department of Chemistry, Nanchang University, Nanchang 330031, China
| | - Xiang Cai
- Department of Chemistry, Nanchang University, Nanchang 330031, China
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