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Akter N, Ahmed T, Haque I, Hossain MK, Ray G, Hossain MM, Islam MS, Ali shaikh MA, Akhtar US. XPS valence band observable light-responsive system for photocatalytic acid Red114 dye decomposition using a ZnO-Cu 2O heterojunction. Heliyon 2024; 10:e30802. [PMID: 38778931 PMCID: PMC11108845 DOI: 10.1016/j.heliyon.2024.e30802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 05/05/2024] [Accepted: 05/06/2024] [Indexed: 05/25/2024] Open
Abstract
ZnO-Cu2O composites were made as photocatalysts in a range of different amounts using an easy, cheap, and environment-friendly coprecipitation method due to their superior visible light activity to remove pollutants from the surrounding atmosphere. X-ray diffraction and Fourier transform infrared spectroscopy (FT-IR) have demonstrated that ZnO-Cu2O catalysts are made of highly pure hexagonal ZnO and cubic Cu2O. X-ray photoelectron spectroscopy has confirmed that there is a substantial interaction between the two phases of the resultant catalyst. The optical characterizations of the synthesized ZnO-Cu2O composite were done via UV-vis reflectance spectroscopy. Due to the doping on ZnO, the absorption range of the ZnO-Cu2O catalyst is shifted from the ultraviolet to the visible region due to diffuse reflection. The degradation efficiency is affected by the Ratio of ZnO: Cu2O and ZnO-Cu2O composite with a proportion of 90:10 exhibited the most prominent photocatalytic activity on Acid Red 114, with a pseudo-first-order rate constant of 0.05032 min-1 that was 6 and 11 times greater than those of ZnO and Cu2O, respectively. The maximum degradation efficiency is 97 %. The enhanced photocatalytic activity of the composite is caused by the synergistic interaction of ZnO and Cu2O, which improves visible light absorption by lowering band gap energy and decreasing the rate at which the electron-hole pairs recombine. The scavenging experiment confirmed that hydroxyl radical was the dominant species for the photodegradation of Acid Red 114. Notably, the recycling test demonstrated the ZnO-Cu2O photocatalyst was highly stable and recyclable. These results suggest that the ZnO-Cu2O mix might be able to clean up environmental pollutants when it meets visible light.
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Affiliation(s)
- Nasrin Akter
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka 1205, Bangladesh
- Noakhali Science and Technology University, Noakhali, 3814, Bangladesh
| | - Tanvir Ahmed
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka 1205, Bangladesh
| | - Imdadul Haque
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka 1205, Bangladesh
| | - Md Kamal Hossain
- BCSIR Laboratories Dhaka, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, 1205, Bangladesh
| | - Gorungo Ray
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka 1205, Bangladesh
| | | | - Md Sagirul Islam
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka 1205, Bangladesh
| | - Md Aftab Ali shaikh
- Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
- Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Umme Sarmeen Akhtar
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka 1205, Bangladesh
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Eshete M, Li X, Yang L, Wang X, Zhang J, Xie L, Deng L, Zhang G, Jiang J. Charge Steering in Heterojunction Photocatalysis: General Principles, Design, Construction, and Challenges. SMALL SCIENCE 2023. [DOI: 10.1002/smsc.202200041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- Mesfin Eshete
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
- Department of Industrial Chemistry College of Applied Sciences Nanotechnology Excellence Center Addis Ababa Science and Technology University P.O. Box 16417 Addis Ababa Ethiopia
| | - Xiyu Li
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
| | - Li Yang
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
| | - Xijun Wang
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
| | - Jinxiao Zhang
- College of Chemistry and Bioengineering Guilin University of Technology 12 Jian'gan Road Guilin Guangxi 541004 P. R. China
| | - Liyan Xie
- A Key Laboratory of the- Ministry of Education for Advanced- Catalysis Materials Department of Chemistry Zhejiang Normal University Jinhua Zhejiang 321004 P. R. China
| | - Linjie Deng
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
| | - Guozhen Zhang
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
| | - Jun Jiang
- Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Jinzhai Road 96 Hefei Anhui 230026 P. R. China
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Nguyen TT, Tran HH, Cao TM, Pham VV. Direct fabrication of graphitic carbon nitride-wrapped titanate nanotube arrays toward photoelectrochemical water oxidation in neutral medium. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1132-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hosseini-Sarvari M, Jafari F, Dehghani A. The study of TiO2/Cu2O nanoparticles as an efficient nanophotocalyst toward surface adsorption and photocatalytic degradation of methylene blue. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02474-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Luo Y, Xing L, Hu C, Zhang W, Lin X, Gu J. Facile synthesis of nanocellulose-based Cu 2O/Ag heterostructure as a surface-enhanced Raman scattering substrate for trace dye detection. Int J Biol Macromol 2022; 205:366-375. [PMID: 35192906 DOI: 10.1016/j.ijbiomac.2022.02.102] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/28/2021] [Accepted: 02/16/2022] [Indexed: 12/16/2022]
Abstract
Semiconductor metal-oxide/metal heterostructures with synergetic properties have potential applications in photocatalysis and optical sensors. Here, Cu2O sub-micro cubes were synthesized under environmentally benign conditions using 2, 2, 6, 6-tetramethylpyperdine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils as a reducing and stabilizing agent. Then the surface of the Cu2O cubes was decorated with silver nanoparticles (AgNPs) by a substitution reaction. The Cu2O/Ag heterostructures within the cellulose nanofibrils (CNFs) network were employed as a promising surface-enhanced Raman scattering (SERS) assay for efficient sensing of methylene blue (MB), reaching a maximum enhancement factor (EF) of 4.0 × 104. Their SERS intensities depended on the coverage density of AgNPs and the wavelength of the excitation laser. The excellent SERS performance may result from the charge transfer between Ag and Cu2O molecules and the strong electromagnetic field at the interface. The CNF-Cu2O/Ag substrates were capable of detecting MB dye down to 10-8 M level with a relative standard deviation of 10-15%, demonstrating great sensitivity and reproducibility.
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Affiliation(s)
- Yinglin Luo
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Lida Xing
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China
| | - Chuanshuang Hu
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China.
| | - Weiwei Zhang
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Xiuyi Lin
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China
| | - Jin Gu
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China.
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Zhou D, Du R, Hu Z, Gao S, Tu Y, Fu Y, Zheng G, Zhou Y. Fabrication of Bi 2MoO 6 Nanosheets/TiO 2 Nanorod Arrays Heterostructures for Enhanced Photocatalytic Performance under Visible-Light Irradiation. NANOMATERIALS 2022; 12:nano12030574. [PMID: 35159919 PMCID: PMC8840124 DOI: 10.3390/nano12030574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 01/28/2022] [Accepted: 01/29/2022] [Indexed: 01/20/2023]
Abstract
Bi2MoO6/TiO2 heterostructures (HSs) were synthesized in the present study by growing Bi2MoO6 nanosheets on vertically aligned TiO2 nanorod arrays using a two-step solvothermal method. Their morphology and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Excellent visible-light absorption was observed by UV–Vis absorption spectroscopy, which was attributed to the presence of the Bi2MoO6 nanosheets with a narrow-band-gap. The specific surface area and pore volume of the photocatalysts were significantly increased due to the hierarchical structure composed of Bi2MoO6 nanosheets and TiO2 nanorods. The photoluminescence and photoelectrochemical characterizations showed improved separation and collection efficiency of the Bi2MoO6/TiO2 HSs towards the interface charge carrier. The photocatalytic analysis of the Bi2MoO6/TiO2 HSs demonstrated a significantly better methylene blue (MB) degradation efficiency of 95% within 3 h than pristine TiO2 nanorod arrays under visible-light irradiation. After three photocatalytic cycles, the degradation rate remained at ~90%. The improved performance of the Bi2MoO6/TiO2 HSs was attributed to the synergy among the extended absorption of visible light; the large, specific surface area of the hierarchical structure; and the enhanced separation efficiency of the photogenerated electron-hole pairs. Finally, we also established the Bi2MoO6/TiO2 HSs band structure and described the photocatalytic dye degradation mechanism. The related electrochemical analysis and free-radical trapping experiments indicated that h+, ·O2− and ·OH have significant effects on the degradation process.
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Affiliation(s)
- Di Zhou
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
| | - Rui Du
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
| | - Zhenglong Hu
- Laboratory of Low-Dimension Functional Nanostructures and Devices, Hubei University of Science and Technology, Xianning 437100, China
- Correspondence: (Z.H.); (G.Z.)
| | - Shu Gao
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
| | - Yafang Tu
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
| | - Yunfei Fu
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
| | - Guang Zheng
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
- Correspondence: (Z.H.); (G.Z.)
| | - Youhua Zhou
- School of Optoelectronic Materials and Technologies, Jianghan University, Wuhan 430056, China; (D.Z.); (R.D.); (S.G.); (Y.T.); (Y.F.); (Y.Z.)
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Qi L, Wang M, Xue J, Zhang Q, Chen F, Liu Q, Li W, Li X. Simultaneous Tuning Band Gaps of Cu 2 O and TiO 2 to Form S-Scheme Hetero-Photocatalyst. Chemistry 2021; 27:14638-14644. [PMID: 34382276 DOI: 10.1002/chem.202102120] [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: 06/14/2021] [Indexed: 11/10/2022]
Abstract
Photocatalytic Z or S scheme merits higher redox potentials and faster charge separation. However, heterostructure photocatalysts with band gaps of bulk materials often have a type I band structure leading to poor photocatalytic activity. In view of this, we report simultaneous tuning of band gaps of Cu2 O and TiO2 , where quantum dot Cu2 O nanoparticles were formed on doped TiO2 with Ti3+ . The reduced size of Cu2 O made its conduction band more negative, whereas the introduction of Ti3+ made the absorption edge red shift to the visible light region. The as-formed heterostructure enabled an S-Scheme mechanism with remarkable activity and stability for visible light photodegradation of 4-chlorophenol (4-CP). The as-obtained photocatalysts' activity demonstrated ca. 510-fold increase as compared to individual ones and a mechanical blend. The as-obtained photocatalysts maintained over 80 % for 5 cycles and 2 months exposure to O2 did not decrease the degradation rate. ESR characterization and scavenger experiments proved the S-Scheme mechanism.
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Affiliation(s)
- Lei Qi
- The State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Mei Wang
- The State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jianbin Xue
- The State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Qiyuan Zhang
- School of Materials Sciences and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Feng Chen
- School of Materials Sciences and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Qianqian Liu
- School of Materials Sciences and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Wanfei Li
- School of Materials Sciences and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Xinheng Li
- The State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
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Jia H, Wong YL, Wang B, Xing G, Tsoi CC, Wang M, Zhang W, Jian A, Sang S, Lei D, Zhang X. Enhanced solar water splitting using plasmon-induced resonance energy transfer and unidirectional charge carrier transport. OPTICS EXPRESS 2021; 29:34810-34825. [PMID: 34809262 DOI: 10.1364/oe.440777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 09/30/2021] [Indexed: 06/13/2023]
Abstract
Solar water splitting by photoelectrochemical (PEC) reactions is promising for hydrogen production. The gold nanoparticles (AuNPs) are often applied to promote the visible response of wideband photocatalysts. However, in a typical TiO2/AuNPs structure, the opposite transfer direction of excited electrons between AuNPs and TiO2 under visible light and UV light severely limits the solar PEC performance. Here we present a unique Pt/TiO2/Cu2O/NiO/AuNPs photocathode, in which the NiO hole transport layer (HTL) is inserted between AuNPs and Cu2O to achieve unidirectional transport of charge carriers and prominent plasmon-induced resonance energy transfer (PIRET) between AuNPs and Cu2O. The measured applied bias photon-to-current efficiency and the hydrogen production rate under AM 1.5G illumination can reach 1.5% and 16.4 μmol·cm-2·h-1, respectively. This work is original in using the NiO film as the PIRET spacer and provides a promising photoelectrode for energy-efficient solar water splitting.
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Gao Y, Wang T. Preparation of Ag2O/TiO2 nanocomposites by two-step method and study of its degradation of RHB. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129049] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Peroxymonosulfate Activation on a Hybrid Material of Conjugated PVC and TiO2 Nanotubes for Enhancing Degradation of Rhodamine B under Visible Light. ADVANCES IN POLYMER TECHNOLOGY 2020. [DOI: 10.1155/2020/8888767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Visible-light-driven photocatalysis is a robust technology for amending the negative effect of pollutants on the environment with a minimum energy use. Herein, we describe a simple approach to producing such a photocatalyst by coupling conjugated polyvinyl chloride (cPVC) with the TiO2 nanotube (TNT) thermolysis method. By activating peroxymonosulfate (PMS) to make a cPVC/TNT/PMS system using visible light as the source, we obtain a significant enhancement in the photocatalytic performance. We show that PMS use at a concentration of 3 mM can fully degrade rhodamine B (RhB) solution at a remarkably high concentration (200 mg L-1) just in 120 min under visible light. The cPVC/TNT/PMS system also shows excellent stability in recycling tests for at least five times. Further, by confining the active species in photocatalytic reactions, we report a thorough understanding of the extent of involvement from those radicals. Our work presents a robust approach to make a high-performance, visible-light-driven photocatalyst, which can be potentially used in practice.
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Simultaneous removal of bacteria and volatile organic compounds on Cu2O-NPs decorated TiO2 nanotubes: Competition effect and kinetic studies. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112722] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Shao Z, Zhang Y, Yang X, Zhong M. Au-Mediated Charge Transfer Process of Ternary Cu 2O/Au/TiO 2-NAs Nanoheterostructures for Improved Photoelectrochemical Performance. ACS OMEGA 2020; 5:7503-7518. [PMID: 32280894 PMCID: PMC7144151 DOI: 10.1021/acsomega.0c00299] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 03/18/2020] [Indexed: 05/05/2023]
Abstract
Based on a facile three-step preparation method, Cu2O/Au/TiO2-NAs ternary heterojunction nanocomposites have been successfully synthesized by electrodepositing a Cu2O layer on the surface of Au nanoparticles (NPs) decorated highly ordered TiO2 nanotube arrays (NAs). The structure, surface morphology, chemical composition, and optical and intrinsic defects properties of the as-prepared samples are characterized by transmission and scanning electron microscopy (TEM and SEM), X-ray diffraction (XRD), UV-vis light absorbance spectra, Raman scattering, and X-ray photoelectron spectroscopy (XPS). Simultaneously, the Cu2O/Au/TiO2-NAs ternary nanohybrids exhibited progressively improved photoelectrocatalytic (PEC) performance compared with the dual Cu2O/TiO2-NAs type-II nanoheterojunctions, confirming by the photocurrent density versus testing time curve (amperometric I-t curve), open-circuit potential versus testing time curve (V oc-t curve), and electrochemical impedance spectroscopy (EIS) measurements, which were mainly ascribed to the synergistic effect of reduced interfacial charge transfer resistance and boosted energetic charge carriers generation associated with embedding Au NPs. Furthermore, the self-consistent charge transfer mechanism of Z-scheme and interband transitions mediated with Au NPs for Cu2O/Au/TiO2-NAs triple nanocomposites is proposed, which was evaluated by nanosecond time-resolved transient photoluminescence (NTRT-PL) spectra excited by 266 and 400 nm, respectively. Following this scheme, UV-vis light photocatalytic activities of Cu2O/Au/TiO2-NAs ternary nanohybrids were elaborated toward photodegradation of methyl orange (MO) in aqueous solution, and the photodegradation rate of optimum triple nanocomplex was found to be 90%.
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Affiliation(s)
- Zhufeng Shao
- College of New Energy, Bohai University, Jinzhou, Liaoning, 121000 China
| | - Yufeng Zhang
- College of New Energy, Bohai University, Jinzhou, Liaoning, 121000 China
| | - Xiujuan Yang
- College of New Energy, Bohai University, Jinzhou, Liaoning, 121000 China
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Markovskaya DV, Zhurenok AV, Kurenkova AY, Kremneva AM, Saraev AA, Zharkov SM, Kozlova EA, Kaichev VV. New titania-based photocatalysts for hydrogen production from aqueous-alcoholic solutions of methylene blue. RSC Adv 2020; 10:34137-34148. [PMID: 35519069 PMCID: PMC9056807 DOI: 10.1039/d0ra07630a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 09/08/2020] [Indexed: 01/06/2023] Open
Abstract
A series of CuOx–TiO2 photocatalysts were prepared using fresh and thermally activated Evonik Aeroxide P25 titanium dioxide. The photocatalysts were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, XANES, diffuse reflectance spectroscopy, and N2 adsorption technique. Photocatalytic activity of the samples was tested in hydrogen production from aqueous-alcoholic solutions of methylene blue under UV radiation (λ = 386 nm). It was found for the first time the synergistic effect of hydrogen production from two substrates—dye and ethanol. The maximum hydrogen production rate in the system water–ethanol–methylene blue was 1 μmol min−1, which is 25 times higher than a value measured in a 10% solution of ethanol in water. The thermal activation of titania also leads to a change in the rate of hydrogen production. The highest catalytic activity was observed for a CuOx–TiO2 photocatalyst based on titania thermally-activated at 600 °C in air. A mechanism of the photocatalytic reaction is discussed. Simultaneous presence of ethanol and methylene blue was shown to provide the most efficient hydrogen production and methylene blue removal.![]()
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Affiliation(s)
| | | | - Anna Yu. Kurenkova
- Federal Research Center Boreskov Institute of Catalysis
- Novosibirsk
- Russia
| | - Anna M. Kremneva
- Federal Research Center Boreskov Institute of Catalysis
- Novosibirsk
- Russia
| | - Andrey A. Saraev
- Federal Research Center Boreskov Institute of Catalysis
- Novosibirsk
- Russia
| | - Sergey M. Zharkov
- Kirensky Institute of Physics
- Federal Research Center KSC SB RAS
- Krasnoyarsk
- Russia
- Siberian Federal University
| | | | - Vasily V. Kaichev
- Federal Research Center Boreskov Institute of Catalysis
- Novosibirsk
- Russia
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Surikanti G, Bajaj P, Sunkara MV. g-C 3N 4-Mediated Synthesis of Cu 2O To Obtain Porous Composites with Improved Visible Light Photocatalytic Degradation of Organic Dyes. ACS OMEGA 2019; 4:17301-17316. [PMID: 31656904 PMCID: PMC6811861 DOI: 10.1021/acsomega.9b02031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 09/16/2019] [Indexed: 05/25/2023]
Abstract
A highly porous architecture of graphitic carbon nitride g-C3N4/Cu2O nanocomposite in the form of cubes with a side length of ≈ 1 μm, large pores of 1.5 nm, and a high surface area of 9.12 m2/g was realized by an optimized in situ synthesis protocol. The synthesis protocol involves dispersing a suitable "Cu" precursor into a highly exfoliated g-C3N4 suspension and initiating the reaction for the formation of Cu2O. Systematic optimization of the conditions and compositions resulted in a highly crystalline g-C3N4/Cu2O composite. In the absence of g-C3N4, the Cu2O particles assemble into cubes with a size of around 300 nm and are devoid of pores. Detailed structural and morphological evaluations by powder X-ray diffraction and field emission scanning electron microscopy revealed the presence of highly exfoliated g-C3N4, which is responsible for the formation of the porous architecture in the cube like assembly of the composite. The micrographs clearly reveal the porous structure of the composite that retains the cubic shape of Cu2O, and the energy-dispersive spectroscopy supports the presence of g-C3N4 within the cubic morphology. Among the different g-C3N4/Cu2O compositions, CN/Cu-5 with 10% of g-C3N4, which is also the optimum composition resulting in a porous cubic morphology, shows the best visible light photocatalytic performance. This has been supported by the ultraviolet diffuse reflectance spectroscopy (UV-DRS) studies of the composite which shows a band gap of around 2.05 eV. The improved photocatalytic performance of the composite could be attributed to the highly porous morphology along with the suitable optical band gap in the visible region of the solar spectrum. The optimized composite, CN/Cu-5, demonstrates a visible light degradation of 81% for Methylene Blue (MB) and 85.3% for Rhodamine-B (RhB) in 120 min. The decrease in the catalyst performance even after three repeated cycles is less than 5% for both MB and RhB dyes. The rate constant for MB and RhB degradation is six and eight times higher with CN/Cu-5 when compared with the pure Cu2O catalyst. To validate our claim that the dye degradation is not merely decolorization, liquid chromatography-mass spectroscopy studies were carried out, and the end products of the degraded dyes were identified.
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Affiliation(s)
- Ganesh
Reddy Surikanti
- Nanomaterials
Laboratory, Department of Polymers and Functional Materials, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500 007, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pooja Bajaj
- Nanomaterials
Laboratory, Department of Polymers and Functional Materials, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500 007, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manorama V. Sunkara
- Nanomaterials
Laboratory, Department of Polymers and Functional Materials, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500 007, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Zhang W, Chen R, Yin Z, Wang X, Wang Z, Fan F, Ma Y. Surface Assistant Charge Separation in PEC Cu 2S-Ni/Cu 2O Cathode. ACS APPLIED MATERIALS & INTERFACES 2019; 11:34000-34009. [PMID: 31442374 DOI: 10.1021/acsami.9b11976] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Fabrication of a high efficiency photocathode is a challenging issue in photoelectrocatalysis (PEC). In this work, a Cu2S-Ni/Cu2O photocathode was constructed via electrodeposition followed by a two-step overlayer deposition procedure including direct-current magnetron sputtering (DCMS) and ion exchange reaction. We found that the presence of Ni in the inner-layer could not only affect the morphology but also enhance the formation rate of the outer-layer Cu2S. The XPS results indicate that the Ni exist as NiOx instead of Ni0. The photocurrent of Cu2S-Ni/Cu2O achieved 2 times of it on the pristine Cu2O. The charge dynamic characterizations, including electrochemical impedance spectroscopy (EIS), Tafel slopes, and photoluminescence (PL) spectra, demonstrated that the Ni can promote the hydrogen evolution reaction follow the Heyrovsky reaction, while Cu2S shows a crucial role on the surface charge separation. At last, surface photovoltage microscopy (SPVM) technology was used to reveal the function of each overlayer. It gives direct evidence for the charge transportation pathway in the system and explains the function of each component.
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Affiliation(s)
- Wan Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , Shaanxi , China
| | - Ruotian Chen
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, The Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM) , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Zhongshan Road 457 , Dalian 116023 , China
| | - Zhiguang Yin
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , Shaanxi , China
| | - Xinyu Wang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , Shaanxi , China
| | - Zenglin Wang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , Shaanxi , China
| | - Fengtao Fan
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, The Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM) , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Zhongshan Road 457 , Dalian 116023 , China
| | - Yi Ma
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , Shaanxi , China
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Zhou F, Liu W, Miao Z, Wang Q. Photocatalytic Behaviors of TiO
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Nanoblets Coated with MoS
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Nanosheets for Solar‐Driven Photocatalysis. ChemistrySelect 2019. [DOI: 10.1002/slct.201900743] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Fang Zhou
- School of PhysicsHarbin Institute of Technology 92 West Dazhi St. Harbin 150001 China
- College of Physical Science & TechnologyYangzhou University No.88 South Daxue Rd. Yangzhou 225002 China
- College of Science & InformationQingdao Agricultural University No.700 Changcheng Rd. Qingdao 266109 China
| | - Wenjun Liu
- School of PhysicsHarbin Institute of Technology 92 West Dazhi St. Harbin 150001 China
| | - Zhilei Miao
- College of Physical Science & TechnologyYangzhou University No.88 South Daxue Rd. Yangzhou 225002 China
| | - Qiang Wang
- College of Physical Science & TechnologyYangzhou University No.88 South Daxue Rd. Yangzhou 225002 China
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Jiang X, Xia H, Zhang L, Cheng S, Zhang Q, Chen Q, Hu W. Synthesis of copper-loaded activated carbon for enhancing the photocatalytic removal of methylene blue. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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