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Das D, Shyam S. Reduced Work Function in Anatase ⟨101⟩ TiO 2 Films Self-Doped by O-Vacancy-Dependent Ti 3+ Bonds Controlling the Photocatalytic Dye Degradation Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:10502-10517. [PMID: 38711250 DOI: 10.1021/acs.langmuir.4c00028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
TiO2 has the proven capability of catalytically decomposing pollutants under light illumination, thereby embracing potential applications in wastewater management. The photocatalytic dye degradation activity is largely controlled by the optical band gap that dictates the extent of electron-hole pair generation via photon absorption, and the recombination kinetics of charges. In this context, the material's work function governs how easily the charge carriers can be transferred at the dye-adsorbed photocatalytically active sites. Accordingly, nanocrystalline TiO2 thin films are grown in the anatase phase with ⟨101⟩ orientation, using RF magnetron sputtering at 200 °C. Besides studying the film's structural morphology, optical band gap, and elemental composition, the electronic properties are extensively investigated. The work function of the material was controlled by varying the O-vacancy-dependent Ti3+ bonding configuration in the network. It has been demonstrated how the photocatalytic methylene blue dye degradation activity of the nanocrystalline TiO2 films of predominantly the anatase phase improves on reducing the sputtering pressure during deposition. At a low deposition pressure of 20 mTorr, a low work function of ∼4.2 eV of the film, resulting from the formation of a Ti3+-bond through the O vacancies in the network, potentially increases its carrier lifetime and delivers the superior photocatalytic activity (∼82.7% dye degradation with a rate constant of k ∼ 0.0073 min-1) via silently facilitating fast electron transfer from the photocatalyst to the dye in the aqueous solution. The higher stoichiometric film prepared at p = 40 mTorr exhibits an inferior photocatalytic activity (∼20.4% dye degradation with a rate constant of k ∼ 0.0009 min-1), as retarded by its higher work function of ∼4.62 eV, despite retaining a relatively low band gap. Thus, without using any heterojunction or extrinsically doped photocatalyst, the dye degradation can be controlled simply by reducing the work function of nanocrystalline TiO2 thin films via controlling the O-vacancy-dependent Ti3+ bonding in its self-doped network.
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Affiliation(s)
- Debajyoti Das
- Energy Research Unit, School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Sukalyan Shyam
- Energy Research Unit, School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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2
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Lee JH, Chakraborty D, Chatterjee S, Cho EB. Role of polymer template in crystal structure and photoactivity of Cu-TiO 2 heterojunction nanostructures towards environmental remediation. ENVIRONMENTAL RESEARCH 2023; 232:116352. [PMID: 37295588 DOI: 10.1016/j.envres.2023.116352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/13/2023] [Accepted: 06/06/2023] [Indexed: 06/12/2023]
Abstract
Exploring porous heterojunction nanomaterials as a photocatalyst for water depollution strategies towards environmental restoration is exceedingly difficult in the perspective of sustainable chemistry. Herein, we first report a porous Cu-TiO2 (TC40) heterojunction by using microphase separation of a novel penta-block copolymer (PLGA-PEO-PPO-PEO-PLGA) as a template through an evaporation induced self-assembly (EISA) method having nanorod-like particle shape. Furthermore, three types of photocatalysts were made with or without template polymer to clarify the function of that template precursor on the surface and morphology, as well as which variables are the most critical for a photocatalyst. TC40 heterojunction nanomaterial displayed high BET surface area along with lower band gap value viz.2.98 eV compare the other and all of these features make it a robust photocatalyst for wastewater treatment. In order to improve water quality, we have carried out experiments on the photodegradation of methyl Orange (MO), highly toxic pollutants that cause health hazards and bioaccumulate in the environment. Our catalyst, TC40 exhibits the 100% photocatalytic efficiency towards MO dye degradation in 40 and 360 min at a rate constant of 0.104 ± 0.007 min-1 and 0.440 ± 0.03 h-1 under UV + Vis and visible light irradiation respectively.
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Affiliation(s)
- Jun-Hyeok Lee
- Institute for Applied Chemistry, Department of Fine Chemistry, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Republic of Korea
| | - Debabrata Chakraborty
- Institute for Applied Chemistry, Department of Fine Chemistry, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Republic of Korea
| | - Sriparna Chatterjee
- Materials Chemistry Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751 013, Odisha, India
| | - Eun-Bum Cho
- Institute for Applied Chemistry, Department of Fine Chemistry, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Republic of Korea.
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3
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Waste-Extracted Zn and Ag Co-Doped Spent Catalyst-Extracted V2O5 for Photocatalytic Degradation of Congo Red Dye: Effect of Metal-Nonmetal Co-Doping. Catalysts 2023. [DOI: 10.3390/catal13030584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023] Open
Abstract
The current study applies the eco-friendly principle of “wastes treat wastes”. By swift methods, a composite photocatalyst was prepared from waste-extracted oxides, namely V2O5, Ag, and ZnO. The metal–lixiviant complexes were used as metal precursors, where the lixiviants act as auto-templates and increase the compatibility between the mixed metallic species, and their controlled thermal removal generates pores. The tri-constitute composite catalyst was doped with nitrogen. The constitution, surface composition, and optical properties of the doped catalysts were investigated by XRD, SEM, TEM, BET surface analysis, XPS, diffuse reflectance, and PL spectra. The as-prepared catalysts were employed in the photodegradation of Congo red dye (CR) under visible irradiation at ambient temperature. The degree of Ag dispersion had a significant effect on the bandgap, as did metal and metal-nonmetal co-doping. The efficiency of dye removal changes dramatically with time up to 120 min, after which it begins to decrease. According to the pH effect, the normal pH of Congo red dye (6.12) is optimal. At a catalyst dose of 1 g L−1 and an irradiation period of 120 min, photodegradation efficiency reached 89.9% and 83.4% over [Ag0.05 ZnO0.05 V2O5(0.90)] and [Ag0.05 ZnO0.05 V2O5(0.90)]N, respectively. The kinetic study depicted the significant role of mass transfer in the reaction rate. The obtained rate constants were 0.995 mole L−1 S−1 and 0.998 mole L−1 S−1 for [Ag0.05 ZnO0.05 V2O5(0.90)] and [Ag0.05 ZnO0.05 V2O5(0.90)]N, respectively.
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4
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Cherif Y, Azzi H, Sridharan K, Ji S, Choi H, Allan MG, Benaissa S, Saidi-Bendahou K, Damptey L, Ribeiro CS, Krishnamurthy S, Nagarajan S, Maroto-Valer MM, Kuehnel MF, Pitchaimuthu S. Facile Synthesis of Gram-Scale Mesoporous Ag/TiO 2 Photocatalysts for Pharmaceutical Water Pollutant Removal and Green Hydrogen Generation. ACS OMEGA 2023; 8:1249-1261. [PMID: 36643558 PMCID: PMC9835632 DOI: 10.1021/acsomega.2c06657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
This work demonstrates a two-step gram-scale synthesis of presynthesized silver (Ag) nanoparticles impregnated with mesoporous TiO2 and evaluates their feasibility for wastewater treatment and hydrogen gas generation under natural sunlight. Paracetamol was chosen as the model pharmaceutical pollutant for evaluating photocatalytic performance. A systematic material analysis (morphology, chemical environment, optical bandgap energy) of the Ag/TiO2 photocatalyst powder was carried out, and the influence of material properties on the performance is discussed in detail. The experimental results showed that the decoration of anatase TiO2 nanoparticles (size between 80 and 100 nm) with 5 nm Ag nanoparticles (1 wt %) induced visible-light absorption and enhanced charge carrier separation. As a result, 0.01 g/L Ag/TiO2 effectively removed 99% of 0.01 g/L paracetamol in 120 min and exhibited 60% higher photocatalytic removal than pristine TiO2. Alongside paracetamol degradation, Ag/TiO2 led to the generation of 1729 μmol H2 g-1 h-1. This proof-of-concept approach for tandem pollutant degradation and hydrogen generation was further evaluated with rare earth metal (lanthanum)- and nonmetal (nitrogen)-doped TiO2, which also showed a positive response. Using a combination of ab initio calculations and our new theory model, we revealed that the enhanced photocatalytic performance of Ag/TiO2 was due to the surface Fermi-level change of TiO2 and lowered surface reaction energy barrier for water pollutant oxidation. This work opens new opportunities for exploiting tandem photocatalytic routes beyond water splitting and understanding the simultaneous reactions in metal-doped metal oxide photocatalyst systems under natural sunlight.
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Affiliation(s)
- Yassine Cherif
- Laboratoire
de Catalyse et Synthèse en Chimie Organique, Université de Tlemcen, BP 119, Tlemcen13000, Algeria
| | - Hajer Azzi
- Laboratoire
de Catalyse et Synthèse en Chimie Organique, Université de Tlemcen, BP 119, Tlemcen13000, Algeria
- Institut
des Sciences et de la Technologie, Université d’Ain
Témouchent, BP
284, 46000Ain Témouchent, Algeria
| | - Kishore Sridharan
- Department
of Nanoscience and Technology, School of Physical Sciences, University of Calicut, P. O. Thenhipalam673635, India
| | - Seulgi Ji
- Theoretical
Materials & Chemistry Group, Institute of Inorganic Chemistry, University of Cologne, Greinstr. 6, 50939Cologne, Germany
| | - Heechae Choi
- Theoretical
Materials & Chemistry Group, Institute of Inorganic Chemistry, University of Cologne, Greinstr. 6, 50939Cologne, Germany
| | - Michael G. Allan
- Department
of Chemistry, Swansea University, Singleton Park, SwanseaSA2 8PP, United Kingdom
| | - Sihem Benaissa
- Institut
des Sciences et de la Technologie, Université d’Ain
Témouchent, BP
284, 46000Ain Témouchent, Algeria
| | - Karima Saidi-Bendahou
- Laboratoire
de Catalyse et Synthèse en Chimie Organique, Université de Tlemcen, BP 119, Tlemcen13000, Algeria
| | - Lois Damptey
- School of
Engineering & Innovation, The Open University, Walton Hall, Milton KeynesMK7 6AA, United Kingdom
| | - Camila Silva Ribeiro
- School of
Engineering & Innovation, The Open University, Walton Hall, Milton KeynesMK7 6AA, United Kingdom
| | - Satheesh Krishnamurthy
- School of
Engineering & Innovation, The Open University, Walton Hall, Milton KeynesMK7 6AA, United Kingdom
| | - Sanjay Nagarajan
- Department
of Chemical Engineering, University of Bath, BathBA2 7AY, United Kingdom
| | - M. Mercedes Maroto-Valer
- Research
Centre for Carbon Solutions, Institute of Mechanical and Processing
Engineering, School of Engineering & Physical Science, Heriot-Watt University, EdinburghEH14 4AS, United Kingdom
| | - Moritz F. Kuehnel
- Department
of Chemistry, Swansea University, Singleton Park, SwanseaSA2 8PP, United Kingdom
- Fraunhofer
Institute for Wind Energy Systems IWES, Am Haupttor 4310, 06237Leuna, Germany
| | - Sudhagar Pitchaimuthu
- Research
Centre for Carbon Solutions, Institute of Mechanical and Processing
Engineering, School of Engineering & Physical Science, Heriot-Watt University, EdinburghEH14 4AS, United Kingdom
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5
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Influence of the solid titanium source on the activity of La1−xTixFeO3 photo-CWPO catalysts under UV-A light. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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6
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Elamathi M. In Situ Hydrothermal Technique Assisted Synthesis of Nano-Rod Shaped Iron Vanadate, Characterization and Visible Light Active Behaviour against Toxicant. HIGH ENERGY CHEMISTRY 2022. [DOI: 10.1134/s0018143922060054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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7
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Bindu GH, Sunku M, Ramaswamy K, Srilekha P, Veerasomaiah P, Vithal M. Effect of Ag
+
, Cu
2+
and Sn
2+
Doping on Structural, Optical and Photocatalytic Properties of KGe
0.5
Te
1.5
O
6
with Defect Pyrochlore Structure. ChemistrySelect 2022. [DOI: 10.1002/slct.202202780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gaddameedi Hima Bindu
- Department of Chemistry Osmania University Hyderabad 500 007 India
- CVR College of Engineering Department of Humanities and Sciences Hyderabad 501 510 India
| | - Manasa Sunku
- Department of Chemistry Osmania University Hyderabad 500 007 India
| | - Kadari Ramaswamy
- Centre for Materials for Electronics Technology (C–MET), Cherlapally, HCL (PO) Hyderabad 500 051 India
| | - Pallati Srilekha
- Department of Chemistry Osmania University Hyderabad 500 007 India
| | | | - Muga Vithal
- Department of Chemistry Osmania University Hyderabad 500 007 India
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8
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Paul R, Warkad IR, Arulkumar S, Parthiban S, Darji HR, Naushad M, Kadam RG, Gawande MB. Facile synthesis of nanostructured TiO2-SiO2 powder for selective photocatalytic oxidation of alcohols to carbonyl compounds. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Synergistic Excited State Involved Catalytic Reduction of (NH3-trz)[Fe(dipic)2] Complex by SnO2/TiO2 Nanocomposite. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02304-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Rivas-Moreno FK, Luna-Flores A, Cruz-González D, González-Coronel VJ, Sánchez-Cantú M, Rodríguez-López JL, Caudillo-Flores U, Tepale N. Effect of Pluronic P103 Concentration on the Simple Synthesis of Ag and Au Nanoparticles and Their Application in Anatase-TiO 2 Decoration for Its Use in Photocatalysis. Molecules 2021; 27:127. [PMID: 35011359 PMCID: PMC8746532 DOI: 10.3390/molecules27010127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 12/14/2021] [Accepted: 12/23/2021] [Indexed: 11/16/2022] Open
Abstract
Silver and gold nanoparticles were synthesized under environmentally-friendly reaction conditions by using a biodegradable copolymer and water as a solvent. The triblock copolymer Pluronic P103 was utilized as a stabilizing agent or soft template to produce Ag and Au nanoparticles (NPs) of different sizes. Moreover, in the synthesis of Au NPs, the polymer acted as a reducing agent, decreasing the number of reagents used and consequently the residues produced, hence, rendering the procedure less complicated. It was observed that as the concentration of the polymer increased, the size of the metallic NPs augmented as well. However, AgNPs and AuNPs prepared with 1 and 10 wt% Pluronic P103, respectively, showed a significant decrease in particle size due to the presence of polymeric soft templates. The hybrid materials (metal/polymer) were characterized by UV-Vis spectroscopy, DLS, and TEM. The pre-synthesized nanoparticles were employed to decorate anatase-TiO2, and the composites were characterized by DRS, XRD, BET surface area measurements, the TEM technique with the EDS spectrum, and XPS spectroscopy to demonstrate NPs superficial incorporation. Finally, methylene blue was used as a probe molecule to evidence the effect of NPs decoration in its photocatalytic degradation. The results showed that the presence of the NPs positively affected methylene blue degradation, achieving 96% and 97% removal by utilizing TAg0.1 and TAu10, respectively, in comparison to bare anatase-TiO2 (77%).
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Affiliation(s)
- Frida Karem Rivas-Moreno
- Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Puebla 72570, Mexico
| | - Adan Luna-Flores
- Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Puebla 72570, Mexico
| | - Daniel Cruz-González
- Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Puebla 72570, Mexico
| | | | - Manuel Sánchez-Cantú
- Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Puebla 72570, Mexico
| | - José Luis Rodríguez-López
- Advanced Materials Department, Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa de San José 2055, Lomas 4 Sección, San Luis Potosi 78216, Mexico
| | - Uriel Caudillo-Flores
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada 22860, Mexico
| | - Nancy Tepale
- Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Puebla 72570, Mexico
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11
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Sukhadeve G, Shaileshkumar, Janbandhu Y, Kumar R, Gedam RS. Ag‐Doped TiO
2
Nanoparticles as an Effective Photocatalyst for Degradation of Indigo Carmine Dye under Visible Light. ChemistrySelect 2021. [DOI: 10.1002/slct.202103629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Gaurav Sukhadeve
- Department of Physics Visvesvaraya National Institute of Technology Nagpur 440010 India E-mail: rupesh
| | - Shaileshkumar
- Department of Physics Visvesvaraya National Institute of Technology Nagpur 440010 India E-mail: rupesh
| | - Y. Janbandhu
- Department of Physics Visvesvaraya National Institute of Technology Nagpur 440010 India E-mail: rupesh
| | - Rahul Kumar
- Department of Physics Visvesvaraya National Institute of Technology Nagpur 440010 India E-mail: rupesh
| | - Rupesh S. Gedam
- Department of Physics Visvesvaraya National Institute of Technology Nagpur 440010 India E-mail: rupesh
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12
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Sustainable fabrication of silver-titania nanocomposites using goji berry (Lycium barbarum L.) fruit extract and their photocatalytic and antibacterial applications. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2021.103456] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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13
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Singh J, Soni R. Efficient charge separation in Ag nanoparticles functionalized ZnO nanoflakes/CuO nanoflowers hybrids for improved photocatalytic and SERS activity. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Subramanian S, Ganapathy S, Subramanian S, Ramasamy T, Ramasamy J. Enhancement in visible light photocatalytic performance using silver-decorated nickel titanate nanofiber composite. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Chauhan N, Singh V, Kumar S, Kumari M. Preparation, Characterization and Evaluations of Carbon-Doped Ag/Fe/TiO₂ Mesoporous Nanocomposite Photocatalyst for Degradation of Methylene Blue and Congo Red. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2021; 21:5344-5351. [PMID: 33875128 DOI: 10.1166/jnn.2021.19331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Carbon doped silver/iron/TiO₂ nanocomposite is synthesized via the solvothermal technique. Titanium tetraisopropoxide is used as a TiO₂ source. The composite samples are characterized by different physicochemical methods, including nitrogen adsorption-desorption analysis, transmission electron microscope, scanning electron microscope, X-ray diffraction, photoluminescence, UV-vis, Fourier-transform infrared, and Energy dispersive X-ray spectroscopy. The nanocrystalline structure of the samples with anatase phase having a tetragonal shape is shown by the XRD and TEM analysis. The photo-absorption boundary of pure TiO₂ expands into the visible light region due to composite formation, shown by analysis of UV-vis data. An increase in the degree of electron-hole couple segregation is shown via photoluminescence analysis. N₂ adsorption-desorption analysis manifests the higher surface area of samples along with mesoporous nature. The high photodegradation action is shown by the composite samples as compared to pure mesoporous TiO₂.
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Affiliation(s)
- Nikhil Chauhan
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
| | - Virender Singh
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
| | - Suresh Kumar
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
| | - Monika Kumari
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
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16
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Singh J, Soni R. Tunable optical properties of Au nanoparticles encapsulated TiO2 spheres and their improved sunlight mediated photocatalytic activity. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.126011] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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17
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Thorat N, Borade S, Varma R, Yadav A, Gupta S, Fernandes R, Sarawade P, Bhanage B, Patel N. High surface area Nanoflakes of P-gC3N4 photocatalyst loaded with Ag nanoparticle with intraplanar and interplanar charge separation for environmental remediation. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.113098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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18
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Kim S, Ryou H, Lee IG, Shin M, Cho BJ, Hwang WS. Impact of Al doping on a hydrothermally synthesized β-Ga 2O 3 nanostructure for photocatalysis applications. RSC Adv 2021; 11:7338-7346. [PMID: 35423267 PMCID: PMC8695041 DOI: 10.1039/d1ra00021g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 01/29/2021] [Indexed: 11/27/2022] Open
Abstract
Aluminum (Al)-doped beta-phase gallium oxide (β-Ga2O3) nanostructures with different Al concentrations (0 to 3.2 at%) are synthesized using a hydrothermal method. The single phase of the β-Ga2O3 is maintained without intermediate phases up to Al 3.2 at% doping. As the Al concentration in the β-Ga2O3 nanostructures increases, the optical bandgap of the β-Ga2O3 increases from 4.69 (Al 0%) to 4.8 (Al 3.2%). The physical, chemical, and optical properties of the Al-doped β-Ga2O3 nanostructures are correlated with photocatalytic activity via the degradation of a methylene blue solution under ultraviolet light (254 nm) irradiation. The photocatalytic activity is enhanced by doping a small amount of substitutional Al atoms (0.6 at%) that presumably create shallow level traps in the band gap. These shallow traps retard the recombination process by separating photogenerated electron–hole pairs. On the other hand, once the Al concentration in the Ga2O3 exceeds 0.6 at%, the crystallographic disorder, oxygen vacancy, and grain boundary-related defects increase as the Al concentration increases. These defect-related energy levels are broadly distributed within the bandgap, which act as carrier recombination centers and thereby degrade the photocatalytic activity. The results of this work provide new opportunities for the synthesis of highly effective β-Ga2O3-based photocatalysts that can generate hydrogen gas and remove harmful volatile organic compounds. The photocatalytic activity is correlated with different parameters affecting the photocatalytic reactions; redox potential (RP), surface area (SA), crystal defect (CD), oxygen defect (OD), and grain-boundary induced defect (GD).![]()
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Affiliation(s)
- Sunjae Kim
- Department of Materials Engineering, Korea Aerospace University Goyang 10540 Republic of Korea .,Department of Smart Drone Convergence, Korea Aerospace University Goyang 10540 Republic of Korea
| | - Heejoong Ryou
- Department of Materials Engineering, Korea Aerospace University Goyang 10540 Republic of Korea
| | - In Gyu Lee
- Department of Materials Engineering, Korea Aerospace University Goyang 10540 Republic of Korea
| | - Myunghun Shin
- Department of Electronics and Information Engineering, Korea Aerospace University Goyang 10540 Republic of Korea
| | - Byung Jin Cho
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea
| | - Wan Sik Hwang
- Department of Materials Engineering, Korea Aerospace University Goyang 10540 Republic of Korea .,Department of Smart Drone Convergence, Korea Aerospace University Goyang 10540 Republic of Korea
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19
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Wang S, Zhang Z, Huo W, Zhu K, Zhang X, Zhou X, Fang F, Xie Z, Jiang J. Preferentially oriented Ag-TiO2 nanotube array film: An efficient visible-light-driven photocatalyst. JOURNAL OF HAZARDOUS MATERIALS 2020; 399:123016. [PMID: 32535517 DOI: 10.1016/j.jhazmat.2020.123016] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/04/2020] [Accepted: 05/21/2020] [Indexed: 05/27/2023]
Abstract
Ag-TiO2 nanotube array films with the preferential orientation of crystals were fabricated on ITO glass by magnetron sputtering and anodization. Comprehensive characterization was performed to ascertain the composition and microstructure characteristics of thin films. The photocatalytic activities were evaluated through the reduction of hexavalent chromium (Cr2O72- (Cr (VI)) as a model compound under visible light irradiation. XRD and XPS studies reveal the development of preferred orientation along [001] in anatase TiO2 nanotubes by adjusting the Ag content during magnetron sputtering. Such unusual behavior is attributed to the minimization of anatase (001) surface energy assisted by Ag. The Ag-TiO2 nanotube arrays having preferred crystal orientation exhibit superior separation/transfer of photo-induced charges. Furthermore, the Ag-TiO2 nanotube arrays show improved absorption of visible light due to the SPR effect induced by Ag and the formation of heterojunction between the TNAs and Ag2O. TNA-3Ag exhibits the highest photocatalytic activities by removing 99.1 % Cr (VI) in 90 min under visible light illumination.
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Affiliation(s)
- Shiqi Wang
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Zeling Zhang
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Wenyi Huo
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Kui Zhu
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Xuhai Zhang
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Xuefeng Zhou
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Feng Fang
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China.
| | - Zonghan Xie
- School of Mechanical Engineering, University of Adelaide, SA 5005, Australia; School of Engineering, Edith Cowan University, Joondalup, WA 6027, Australia
| | - Jianqing Jiang
- School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China; School of Mechanical Engineering, Nanjing Forestry University, Nanjing, 210037, China
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20
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Constructing a compact heterojunction structure of Ag2CO3/Ag2O in-situ intermediate phase transformation decorated on ZnO with superior photocatalytic degradation of ibuprofen. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117391] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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21
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Kumar P, Singh V, Kumar S, Chauhan N, Saharan BS. Solvothermal synthesis of C doped Co-Cu/TiO 2 based nanocomposite to study their photocatalytic activity. NANO EXPRESS 2020. [DOI: 10.1088/2632-959x/aba683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
The solvothermal approach is applied to produce doped titanium dioxide nanoparticles in the mesoporous form using Pluronic F127 as a delicate mold. The formulated samples are investigated successfully via x-ray diffraction, ultraviolet-visible spectroscopy, photoluminescence spectroscopy, scanning electron microscope, energy dispersive x-ray, transmission electron microscope, nitrogen adsorption-desorption analysis, and Fourier-transform infrared spectroscopy. Analysis of XRD, SEM, and TEM demonstrates the existence of a nanocrystalline size range of the particles. Methylene blue, congo red, and malachite green dyes are used to evaluate the photocatalytic competence of the samples. The results verified that the TiO2 including a peak quantity of copper (4%) shows maximum photocatalysis caused by the declined bandgap energy including effective charge separation of photoinduced charge carrier with a maximum surface area as revealed by ultraviolet-visible, photoluminescence spectroscopy & nitrogen adsorption-desorption analysis respectively.
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22
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Fakharian‐Qomi MJ, Sadeghzadeh‐Attar A. Template Based Synthesis of Plasmonic Ag‐modified TiO
2
/SnO
2
Nanotubes with Enhanced Photostability for Efficient Visible‐Light Photocatalytic H
2
Evolution and RhB Degradation. ChemistrySelect 2020. [DOI: 10.1002/slct.202001119] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mohammad Javad Fakharian‐Qomi
- Department of Metallurgy and Materials Engineering University of Kashan, P.O. Box. 87317-53153, Ghotb Ravandi Blvd. Kashan Iran
| | - Abbas Sadeghzadeh‐Attar
- Department of Metallurgy and Materials Engineering University of Kashan, P.O. Box. 87317-53153, Ghotb Ravandi Blvd. Kashan Iran
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23
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Kato K, Xin Y, Hong J, Katsumata KI, Shirai T. Synthesis of core/shell Ti/TiOx photocatalyst via single-mode magnetic microwave assisted direct oxidation of TiH2. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Thakur A, Kumar P, Kaur D, Devunuri N, Sinha RK, Devi P. TiO 2 nanofibres decorated with green-synthesized P Au/Ag@CQDs for the efficient photocatalytic degradation of organic dyes and pharmaceutical drugs. RSC Adv 2020; 10:8941-8948. [PMID: 35496552 PMCID: PMC9050055 DOI: 10.1039/c9ra10804a] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Accepted: 01/31/2020] [Indexed: 01/05/2023] Open
Abstract
Organic pollutants such as dyes and pharmaceutical drugs have become an environmental menace, particularly in water bodies owing to their unregulated discharge. It is thus required to develop an economically viable and environment-friendly approach for their degradation in water bodies. In this study, for the first time, we report green route-synthesized plasmonic nanostructures (PM-CQDs (where M: Au and Ag)) decorated onto TiO2 nanofibers for the treatment of toxic dye- and pharmaceutical drug-based wastewater. PM-CQDs are efficaciously synthesized using carbon quantum dots (CQDs) as the sole reducing and capping agent, wherein CQDs are derived via a green synthesis approach from Citrus limetta waste. The characteristic electron-donating property of CQDs played a key role in the reduction of Au3+ to Au0 and Ag+ to Ag0 under visible light irradiation to obtain PAu-CQDs and PAg-CQDs, respectively. Thus, the obtained CQDs, PAu-CQDs, and PAg-CQDs are loaded onto TiO2 nanofibers to obtain a PM-CQD/TiO2 nanocomposite (NC), and are further probed via transmission electron microscopy, scanning electron microscopy and UV-visible spectrophotometry. The degradation of organic pollutants and pharmaceutical drugs using methylene blue and erythromycin as model pollutants is mapped with UV-vis and NMR spectroscopy. The results demonstrate the complete MB dye degradation in 20 minutes with 1 mg mL-1 of PAu-CQD/TiO2 NC, which otherwise is 30 minutes for PAg@CQD/TiO2 dose under visible light irradiation. Similarly, the pharmaceutical drug was found to degrade in 150 minutes with PAu-CQD/TiO2 photocatalysts. These findings reveal the enhanced photocatalytic performance of the green-synthesized Au decorated with TiO2 nanofibers and are attributed to the boosted SPR effect and aqueous-phase stability of Au nanostructures. This study opens a new domain of utilizing waste-derived and green-synthesized plasmonic nanostructures for the degradation of toxic/hazardous dyes and pharmaceutical pollutants in water.
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Affiliation(s)
- Anupma Thakur
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
- CSIR-Central Scientific Instruments Organisation Sector-30 C Chandigarh-160030 India
| | - Praveen Kumar
- School of Materials Science, Indian Association for the Cultivation of Science Kolkata-700030 India
| | - Devinder Kaur
- CSIR-Central Scientific Instruments Organisation Sector-30 C Chandigarh-160030 India
| | - Nagaraju Devunuri
- Vignan's Foundation for Science, Technology & Research Guntur Andhra Pradesh - 522213 India
| | - R K Sinha
- CSIR-Central Scientific Instruments Organisation Sector-30 C Chandigarh-160030 India
| | - Pooja Devi
- CSIR-Central Scientific Instruments Organisation Sector-30 C Chandigarh-160030 India
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25
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Waehayee A, Watthaisong P, Wannapaiboon S, Chanlek N, Nakajima H, Wittayakun J, Suthirakun S, Siritanon T. Effects of different exchanging ions on the band structure and photocatalytic activity of defect pyrochlore oxide: a case study on KNbTeO 6. Catal Sci Technol 2020. [DOI: 10.1039/c9cy01782h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The effects of different exchanging ions including Ag, Cu, and Sn on enhancing the photocatalytic activity of KNbTeO6 are investigated by means of experiments and calculations.
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Affiliation(s)
- Anurak Waehayee
- School of Chemistry
- Institute of Science
- Suranaree University of Technology
- Muang
- Thailand
| | - Panuwat Watthaisong
- School of Chemistry
- Institute of Science
- Suranaree University of Technology
- Muang
- Thailand
| | | | - Narong Chanlek
- Synchrotron Light Research Institute
- Nakhon Ratchasima 30000
- Thailand
- Research Network NANOTEC – SUT on Advanced Nanomaterials and Characterization
- School of chemistry
| | - Hideki Nakajima
- Synchrotron Light Research Institute
- Nakhon Ratchasima 30000
- Thailand
| | - Jatuporn Wittayakun
- School of Chemistry
- Institute of Science
- Suranaree University of Technology
- Muang
- Thailand
| | - Suwit Suthirakun
- School of Chemistry
- Institute of Science
- Suranaree University of Technology
- Muang
- Thailand
| | - Theeranun Siritanon
- School of Chemistry
- Institute of Science
- Suranaree University of Technology
- Muang
- Thailand
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26
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Navarro-Aguilar AI, Obregón S, Hernández-Uresti DB, Suárez-de la Cruz J. Effective coupling of BiPO4/g-C3N4 hybrid composites in ciprofloxacin photodegradation. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-03825-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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27
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Cheshme Khavar AH, Moussavi G, Mahjoub A, Yaghmaeian K, Srivastava V, Sillanpää M, Satari M. Novel magnetic Fe3O4@rGO@ZnO onion-like microspheres decorated with Ag nanoparticles for the efficient photocatalytic oxidation of metformin: toxicity evaluation and insights into the mechanisms. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01381d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Emerging water contaminants, including pharmaceutical and personal care products, have become a major concern in water pollution, and several efforts have been made for the efficient removal of these contaminants.
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Affiliation(s)
- Amir Hossein Cheshme Khavar
- Department of Environmental Health Engineering
- Faculty of Medical Sciences
- Tarbiat Modares University
- Tehran
- Iran
| | - Gholamreza Moussavi
- Department of Environmental Health Engineering
- Faculty of Medical Sciences
- Tarbiat Modares University
- Tehran
- Iran
| | - Alireza Mahjoub
- Department of Chemistry
- Faculty of Basic Sciences
- Tarbiat Modares University
- Tehran
- Iran
| | - Kamyaer Yaghmaeian
- Department of Environmental Health Engineering
- School of Public Health
- Tehran University of Medical Sciences
- Tehran
- Iran
| | - Varsha Srivastava
- Department of Green Chemistry
- School of Engineering Science
- Lappeenranta-Lahti University of Technology
- FI-50130 Mikkeli
- Finland
| | - Mika Sillanpää
- Department of Green Chemistry
- School of Engineering Science
- Lappeenranta-Lahti University of Technology
- FI-50130 Mikkeli
- Finland
| | - Mohammad Satari
- Department of Biology
- Faculty of Sciences
- Malayer University
- Malayer
- Iran
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28
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Jha M, Ansari S, Shimpi NG. Ultrasonic assisted green synthesis of Ag:CdO nanocubes and nanospheres using Citrus limon leaves for efficient degradation of organic dyes. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.09.030] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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29
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Solar Concentration for Wastewaters Remediation: A Review of Materials and Technologies. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app9010118] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
As the effectiveness of conventional wastewater treatment processes is increasingly challenged by the growth of industrial activities, a demand for low-cost and low-impact treatments is emerging. A possible solution is represented by systems coupling solar concentration technology with advanced oxidation processes (AOP). In this paper, a review of solar concentration technologies for wastewater remediation is presented, with a focus on photocatalyst materials used in this specific research context. Recent results, though mostly on model systems, open promising perspectives for the use of concentrated sunlight as the energy source powering AOPs. We identify (i) the development of photocatalyst materials capable of efficiently working with sunlight, and (ii) the transition to real wastewater investigation as the most critical issues to be addressed by research in the field.
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30
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Varma R, Yadav M, Tiwari K, Makani N, Gupta S, Kothari DC, Miotello A, Patel N. Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN-Codoped TiO 2 Photocatalyst. Photochem Photobiol 2018; 94:955-964. [PMID: 29797566 DOI: 10.1111/php.12942] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 05/21/2018] [Indexed: 11/28/2022]
Abstract
In the present manuscript, we explore the VN-codoped TiO2 system intended to understand the role played by each dopant in synergistic enhancement in performance of TiO2 photocatalyst. The photocatalytic decomposition of organic pollutants in aqueous solution under visible light was used as a probe reaction to evaluate the performance of VN-codoped TiO2 samples with different V and N concentrations. An optical measurement of VN-codoped TiO2 shows considerable improved visible light absorption with increase in V-concentration as compared to increase in N concentration, which was due to the effective narrowing of the band gap by V-doping. The energy levels formed by N-dopants act as the trapping centers for photogenerated holes to suppress recombination process as indicated by PL and TRPL results. It is also observed that at high V-concentrations recombination centers are created in the form of oxygen vacancies as indicated by XPS and PL. In VN-codoped TiO2 , addition of N partially fills these oxygen vacancies to reduce the number of recombination centers and prolong the lifetime of charge carriers. Thus, V improves the visible light absorption while N reduces the recombination of electron-hole pairs, thus creating the synergistic effect to produce three times better performance than pure TiO2 .
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Affiliation(s)
- Ranjana Varma
- Department of Physics, University of Mumbai, Mumbai, India
| | - Manisha Yadav
- National Centre for Nanosciences & Nanotechnology, University of Mumbai, Mumbai, India
| | - Kajal Tiwari
- Department of Physics, University of Mumbai, Mumbai, India
| | - Nisha Makani
- Department of Physics, University of Mumbai, Mumbai, India
| | - Suraj Gupta
- Department of Physics, University of Mumbai, Mumbai, India
| | | | - Antonio Miotello
- Dipartimento di Fisica, Università degli Studi di Trento, Trento, Italy
| | - Nainesh Patel
- Department of Physics, University of Mumbai, Mumbai, India.,National Centre for Nanosciences & Nanotechnology, University of Mumbai, Mumbai, India
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31
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Adhikari S, Eswar NK, Sangita S, Sarkar D, Madras G. Investigation of nano Ag-decorated SiC particles for photoelectrocatalytic dye degradation and bacterial inactivation. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.02.017] [Citation(s) in RCA: 20] [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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32
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Veldurthi NK, Eswar NK, Singh SA, Madras G. Heterojunction ZnWO4/ZnFe2O4 composites with concerted effects and integrated properties for enhanced photocatalytic hydrogen evolution. Catal Sci Technol 2018. [DOI: 10.1039/c7cy02281f] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel co-catalyst free ZnWO4/ZnFe2O4 heterojunction composite was successfully synthesized using a facile co-precipitation method for photocatalytic H2 evolution.
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Affiliation(s)
| | | | - Satyapaul A. Singh
- Department of Chemical Engineering
- Indian Institute of Science
- Bangalore
- India
| | - Giridhar Madras
- Department of Chemical Engineering
- Indian Institute of Science
- Bangalore
- India
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