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Samriti, Kumar P, Kuznetsov AY, Swart HC, Prakash J. Sensitive, Stable, and Recyclable ZnO/Ag Nanohybrid Substrates for Surface-Enhanced Raman Scattering Metrology. ACS MATERIALS AU 2024; 4:413-423. [PMID: 39006401 PMCID: PMC11240408 DOI: 10.1021/acsmaterialsau.4c00002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 03/27/2024] [Accepted: 03/27/2024] [Indexed: 07/16/2024]
Abstract
Surface-enhanced Raman scattering is a practical, noninvasive spectroscopic technique that measures chemical fingerprints for varieties of molecules in multiple applications. However, synthesizing appropriate substrates for practical, long-term applications of this method has always been a challenging task. In the present study, we show that ZnO/Ag nanohybrid substrates may act as highly stable, sensitive, and recyclable substrates for surface-enhanced Raman scattering, as illustrated by the detection of methylene blue, selected as a test dye molecule with self-cleaning functionalities. Specifically, we demonstrate the detection enhancement factor of 3.7 × 107 along with exceptional long-term stability explained in terms of the localized surface plasmon resonance from the Ag nanocrystals embedded into the chemically inert ZnO nanoparticles, constituting the nanohybrid. Significantly, these substrates can be efficiently cleaned and regenerated while maintaining their high performance upon recycling. As a result, using these substrates, up to 10-12 M detection sensitivity has been demonstrated, enabling the accuracy required in modern environmental monitoring, bioassays, and analytical chemistry. Thus, ZnO nanoparticles with embedded Ag nanocrystals constitute a novel class of advanced nanohybrid substrates for use in multiple applications of surface-enhanced Raman scattering metrology.
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Affiliation(s)
- Samriti
- Department of Chemistry, National Institute of Technology Hamirpur, Hamirpur, Himachal Pradesh 177005, India
| | - Promod Kumar
- Department of Physics, University of the Free State, Bloemfontein 9301, Republic of South Africa
| | - A Yu Kuznetsov
- Department of Physics, Centre for Materials Science and Nanotechnology, University of Oslo, Oslo N-0316, Norway
| | - H C Swart
- Department of Physics, University of the Free State, Bloemfontein 9301, Republic of South Africa
| | - Jai Prakash
- Department of Chemistry, National Institute of Technology Hamirpur, Hamirpur, Himachal Pradesh 177005, India
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2
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Sharma M, Sajwan D, Gouda A, Sharma A, Krishnan V. Recent progress in defect-engineered metal oxides for photocatalytic environmental remediation. Photochem Photobiol 2024; 100:830-896. [PMID: 38757336 DOI: 10.1111/php.13959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 04/09/2024] [Accepted: 04/10/2024] [Indexed: 05/18/2024]
Abstract
Rapid industrial advancement over the last few decades has led to an alarming increase in pollution levels in the ecosystem. Among the primary pollutants, harmful organic dyes and pharmaceutical drugs are directly released by industries into the water bodies which serves as a major cause of environmental deterioration. This warns of a severe need to find some sustainable strategies to overcome these increasing levels of water pollution and eliminate the pollutants before being exposed to the environment. Photocatalysis is a well-established strategy in the field of pollutant degradation and various metal oxides have been proven to exhibit excellent physicochemical properties which makes them a potential candidate for environmental remediation. Further, with the aim of rapid industrialization of photocatalytic pollutant degradation technology, constant efforts have been made to increase the photocatalytic activity of various metal oxides. One such strategy is the introduction of defects into the lattice of the parent catalyst through doping or vacancy which plays a major role in enhancing the catalytic activity and achieving excellent degradation rates. This review provides a comprehensive analysis of defects and their role in altering the photocatalytic activity of the material. Various defect-rich metal oxides like binary oxides, perovskite oxides, and spinel oxides have been summarized for their application in pollutant degradation. Finally, a summary of existing research, followed by the existing challenges along with the potential countermeasures has been provided to pave a path for the future studies and industrialization of this promising field.
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Affiliation(s)
- Manisha Sharma
- School of Chemical Sciences and Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, India
| | - Devanshu Sajwan
- School of Chemical Sciences and Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, India
| | - Ashrumochan Gouda
- School of Chemical Sciences and Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, India
| | - Anitya Sharma
- School of Chemical Sciences and Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, India
| | - Venkata Krishnan
- School of Chemical Sciences and Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, India
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3
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Portillo-Cortez K, Caudillo-Flores U, Sánchez-López P, Smolentseva E, Dominguez D, Fuentes-Moyado S. Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C 3N 4. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:623. [PMID: 38607157 PMCID: PMC11013134 DOI: 10.3390/nano14070623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 03/28/2024] [Accepted: 03/29/2024] [Indexed: 04/13/2024]
Abstract
The limited access to fresh water and the increased presence of emergent pollutants (EPs) in wastewater has increased the interest in developing strategies for wastewater remediation, including photocatalysis. Graphitic carbon nitride (g-C3N4) is a 2D non-metal material with outstanding properties, such as a 2.7 eV bandgap and physicochemical stability, making it a promising photocatalyst. This work reports the process of obtaining high-surface-area (SA) g-C3N4 using the thermal-exfoliation process and the posterior effect of Ag-nanoparticle loading over the exfoliated g-C3N4 surface. The photocatalytic activity of samples was evaluated through methylene blue (MB) degradation under visible-light radiation and correlated to its physical properties obtained by XRD, TEM, BET, and UV-Vis analyses. Moreover, 74% MB degradation was achieved by exfoliated g-C3N4 compared to its bulk counterpart (55%) in 180 min. Moreover, better photocatalytic performances (94% MB remotion) were registered at low Ag loading, with 5 wt.% as the optimal value. Such an improvement is attributed to the synergetic effect produced by a higher SA and the role of Ag nanoparticles in preventing charge-recombination processes. Based on the results, this work provides a simple and efficient methodology to obtain Ag/g-C3N4 photocatalysts with enhanced photocatalytic performance that is adequate for water remediation under sunlight conditions.
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Affiliation(s)
| | - Uriel Caudillo-Flores
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada CP 22860, Mexico; (K.P.-C.); (P.S.-L.); (E.S.); (D.D.); (S.F.-M.)
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4
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Zhu A, Ali S, Wang Z, Xu Y, Lin R, Jiao T, Ouyang Q, Chen Q. ZnO@Ag-Functionalized Paper-Based Microarray Chip for SERS Detection of Bacteria and Antibacterial and Photocatalytic Inactivation. Anal Chem 2023; 95:18415-18425. [PMID: 38060837 DOI: 10.1021/acs.analchem.3c03492] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Bacterial infections caused by pathogenic microorganisms have become a serious, widespread health concern. Thus, it is essential and required to develop a multifunctional platform that can rapidly and accurately determine bacteria and effectively inhibit or inactivate pathogens. Herein, a microarray SERS chip was successfully synthesized using novel metal/semiconductor composites (ZnO@Ag)-ZnO nanoflowers (ZnO NFs) decorated with Ag nanoparticles (Ag NPs) arrayed on a paper-based chip as a supporting substrate for in situ monitoring and photocatalytic inactivation of pathogenic bacteria. Typical Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli and Vibrio parahemolyticus were selected as models. Partial least-squares discriminant analysis (PLS-DA) was performed to minimize the dimensionality of SERS spectra data sets and to develop a cost-effective identification model. The classification accuracy was 100, 97.2, and 100% for S. aureus, E. coli, and V. parahemolyticus, respectively. The antimicrobial activity of ZnO@Ag was proved by the microbroth dilution method, and the minimum inhibitory concentrations (MICs) of S. aureus, E. coli, and V. parahemolyticus were 40, 50, and 55 μg/mL, respectively. Meanwhile, it demonstrated remarkable photocatalytic performance under natural sunlight for the inactivation of pathogenic bacteria, and the inactivation rates for S. aureus, E. coli, and V. parahemolyticus were 100, 97.03 and 97.56%, respectively. As a result, the microarray chip not only detected the bacteria with high sensitivity but also confirmed the antibacterial and photocatalytic sterilization properties. Consequently, it offers highly prospective strategies for foodborne diseases caused by pathogenic bacteria.
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Affiliation(s)
- Afang Zhu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Shujat Ali
- College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, P. R. China
| | - Zhen Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Yi Xu
- College of Food and Biological Engineering, Jimei University, Xiamen 361021, P. R. China
| | - Rongxi Lin
- Fujian Bama Tea Industry Co., Ltd., Quanzhou 362442, P. R. China
| | - Tianhui Jiao
- College of Food and Biological Engineering, Jimei University, Xiamen 361021, P. R. China
| | - Qin Ouyang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Quansheng Chen
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
- College of Food and Biological Engineering, Jimei University, Xiamen 361021, P. R. China
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5
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Zhong Y, Zhang X, Xia Y, Zhang L, Xu Q, Zhu X, Feng W, Qin Q. A Fresh Perspective on the Impact of ZnTiO 3 Coupling on the Microstructure and Photocatalytic Properties of TiO 2 Fabricated at Varied Temperatures. Molecules 2023; 28:7626. [PMID: 38005348 PMCID: PMC10675743 DOI: 10.3390/molecules28227626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/13/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023] Open
Abstract
ZnTiO3/TiO2 composite photocatalysts were synthesized via the sol-gel technique, and the impact of varying heat treatment temperatures (470, 570, 670 °C) on their crystalline arrangement, surface morphology, elemental composition, chemical state, specific surface area, optical characteristics, and photocatalytic efficacy was systematically investigated. The outcomes revealed that, as the temperature ascends, pure TiO2 undergoes a transition from anatase to rutile, ultimately forming a hybrid crystal structure at 670 °C. The incorporation of ZnTiO3 engenders a reduction in the TiO2 grain dimensions and retards the anatase-to-rutile phase transition. Consequently, the specimens manifest a composite constitution of anatase and ZnTiO3. In contrast, for pure TiO2, the specimen subjected to 670 °C annealing demonstrates superior photocatalytic performance due to its amalgamated crystal arrangement. The degradation efficacy of methylene blue (MB) aqueous solution attains 91% within a 60-min interval, with a calculated first-order reaction rate constant of 0.039 min-1. Interestingly, the ZnTiO3/TiO2 composite photocatalysts exhibit diminished photocatalytic activity in comparison to pristine TiO2 across all three temperature variations. Elucidation of the photocatalytic mechanism underscores that ZnTiO3 coupling augments the generation of photogenerated charge carriers. Nonetheless, concurrently, it undermines the crystalline integrity of the composite, yielding an excess of amorphous constituents that impede the mobility of photoinduced carriers. This dual effect also fosters escalated recombination of photogenerated charges, culminating in diminished quantum efficiency and reduced photocatalytic performance.
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Affiliation(s)
- Yuanyuan Zhong
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Xiuping Zhang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Yangwen Xia
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Ling Zhang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Qiao Xu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
- Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643002, China
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
- Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643002, China
| | - Qin Qin
- Intelligent Manufacturing College, Chengdu Jincheng College, Chengdu 611731, China;
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6
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Das A, Liu D, Wary RR, Vasenko AS, Prezhdo OV, Nair RG. Mn-Modified ZnO Nanoflakes for Optimal Photoelectrochemical Performance Under Visible Light: Experimental Design and Theoretical Rationalization. J Phys Chem Lett 2023; 14:9604-9611. [PMID: 37862673 PMCID: PMC10626631 DOI: 10.1021/acs.jpclett.3c02730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/12/2023] [Accepted: 10/18/2023] [Indexed: 10/22/2023]
Abstract
Doping of zinc oxide (ZnO) with manganese (Mn) tunes midbandgap states of ZnO to enhance its optical properties and makes it into an efficient photoactive material for photoelectrochemical water splitting, waste removal from water, and other applications. We demonstrate that ZnO modified with 1 at. % Mn exhibits the best performance, as rationalized by experimental, structural, and optical characterization and theoretical analysis. ZnO doped with the optimal Mn content possesses improved light absorption in the visible region and minimizes charge carrier recombination. The doping is substitutional and creates midgap states near the valence band. Mn atoms break localized charge traps at oxygen vacancy sites and eliminate photoluminescence peaks associated with oxygen vacancies. The optimal performance of Mn-modified ZnO is demonstrated with the photodegradation of Congo red and photoelectrochemical water splitting.
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Affiliation(s)
- Abinash Das
- HSE
University, 101000 Moscow, Russia
- PSG
Institute of Advanced Studies, Coimbatore, Tamil Nadu 641004, India
| | | | - Riu Riu Wary
- Solar
Energy Materials Research & Testing Laboratory (SMaRT lab), Department
of Physics, National Institute of Technology
Silchar, Silchar, Assam 788010, India
| | - Andrey S. Vasenko
- HSE
University, 101000 Moscow, Russia
- Donostia
International Physics Center (DIPC), 20018 San Sebastián-Donostia, Euskadi, Spain
| | - Oleg V. Prezhdo
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Department
of Physics & Astronomy, University of
Southern California, Los Angeles, California 90089, United States
| | - Ranjith G. Nair
- Solar
Energy Materials Research & Testing Laboratory (SMaRT lab), Department
of Physics, National Institute of Technology
Silchar, Silchar, Assam 788010, India
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7
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Song MS, Patil RP, Hwang IS, Mahadik MA, Jang TH, Oh BT, Chae WS, Choi SH, Lee HH, Jang JS. In situ fabrication of Ag decorated porous ZnO photocatalyst via inorganic-organic hybrid transformation for degradation of organic pollutant and bacterial inactivation. CHEMOSPHERE 2023; 341:140057. [PMID: 37673185 DOI: 10.1016/j.chemosphere.2023.140057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 09/01/2023] [Accepted: 09/02/2023] [Indexed: 09/08/2023]
Abstract
In this study, in situ silver (Ag) - porous ZnO photocatalysts were synthesized via solvothermal and post-annealing treatment. The formation of the porous ZnO structure due to the removal of organic moieties from the inorganic-organic hybrids Ag-ZnS(en)0.5 during the annealing process. The optimal Ag-ZnO photocatalyst showed excellent photocatalytic degradation activity, with 95.5% orange II dye and 97.2% bisphenol A (BPA) degradation under visible light conditions. Additionally, the photocatalytic inactivation of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) led to a 97% inactivation rate after 2 h under dark conditions. Trapping experiments suggest that the superoxide anion (O2-) radicals are the main active species to degrade the organic dye. The improved photocatalytic dye degradation activity and inactivation of bacteria were attributed to the synergistic effect of Ag and porous ZnO structure, increased surface area, and efficiently separated the photoexcited charge carriers. This work could provide an effective strategy for the synthesis of porous structures toward organic pollutant degradation and bacterial inactivation in wastewater.
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Affiliation(s)
- Min Seok Song
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea
| | - Ruturaj P Patil
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea
| | - In Seon Hwang
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea
| | - Mahadeo A Mahadik
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea
| | - Tae-Hu Jang
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea
| | - Byung Taek Oh
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea
| | - Weon-Sik Chae
- Analysis Research Division, Daegu Center, Korea Basic Science Institute, Daegu, 702-701, Republic of Korea
| | - Sun Hee Choi
- Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Hyun Hwi Lee
- Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
| | - Jum Suk Jang
- Division of Biotechnology, Safety, Environment, and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan, 54596, Republic of Korea.
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8
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Yang D, Xia Y, Zhang L, Liu J, Zhu X, Feng W. Investigation on the Structural and Photocatalytic Performance of Oxygen-Vacancy-Enriched SnO 2-CeO 2 Heterostructures. Int J Mol Sci 2023; 24:15446. [PMID: 37895125 PMCID: PMC10607804 DOI: 10.3390/ijms242015446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 10/09/2023] [Accepted: 10/20/2023] [Indexed: 10/29/2023] Open
Abstract
In this study, pure CeO2 and oxygen-vacancy-enriched SnO2-CeO2 composite materials were prepared using the sol-gel method, and their microstructures and photocatalytic properties were investigated. The results indicate that SnO2 coupling promotes the separation and transfer of photogenerated electrons and holes and suppresses their recombination. The 50% SnO2-CeO2 composite material exhibited a decreased specific surface area compared to pure CeO2 but significantly increased oxygen vacancy content, demonstrating the highest photogenerated charge separation efficiency and the best photocatalytic performance. After 120 min of illumination, the degradation degree of MB by the 50% SnO2-CeO2 composite material increased from 28.8% for pure CeO2 to 90.8%, and the first-order reaction rate constant increased from 0.002 min-1 to 0.019 min-1.
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Affiliation(s)
| | | | | | | | - Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (D.Y.); (Y.X.); (J.L.)
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (D.Y.); (Y.X.); (J.L.)
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9
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Todan L, Predoană L, Petcu G, Preda S, Culiță DC, Băran A, Trușcă RD, Surdu VA, Vasile BȘ, Ianculescu AC. Comparative Study of MgO Nanopowders Prepared by Different Chemical Methods. Gels 2023; 9:624. [PMID: 37623079 PMCID: PMC10453559 DOI: 10.3390/gels9080624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 07/30/2023] [Accepted: 07/31/2023] [Indexed: 08/26/2023] Open
Abstract
Magnesium oxide (MgO) was synthesized by three different methods: the sol-gel (SG), microwave-assisted sol-gel (MW), and hydrothermal (HT) methods for comparing the influence of the preparation conditions on the properties of the products. The powders were annealed at 450 °C. The samples were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM/HRTEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDX), BET specific surface area and porosity, photoluminescence, and UV-Vis spectroscopy. The samples consisted mainly of periclase as a crystalline phase, and the MW and HT preparation methods generated particles with higher specific surface areas. The powders had less-defined morphologies and high levels of aggregation. The optical band gaps of the samples were determined from UV DRS, and the photocatalytic activities of the magnesium oxides obtained by the three methods towards the degradation of methyl orange (MO) under UV light irradiation was evaluated.
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Affiliation(s)
- Ligia Todan
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania (A.B.)
| | - Luminița Predoană
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania (A.B.)
| | - Gabriela Petcu
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania (A.B.)
| | - Silviu Preda
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania (A.B.)
| | - Daniela Cristina Culiță
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania (A.B.)
| | - Adriana Băran
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania (A.B.)
| | - Roxana-Doina Trușcă
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, “Politehnica” University of Bucharest, 1-7 Gh. Polizu, 011061 Bucharest, Romania (V.-A.S.); (B.Ș.V.)
| | - Vasile-Adrian Surdu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, “Politehnica” University of Bucharest, 1-7 Gh. Polizu, 011061 Bucharest, Romania (V.-A.S.); (B.Ș.V.)
| | - Bogdan Ștefan Vasile
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, “Politehnica” University of Bucharest, 1-7 Gh. Polizu, 011061 Bucharest, Romania (V.-A.S.); (B.Ș.V.)
| | - Adelina-Carmen Ianculescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, “Politehnica” University of Bucharest, 1-7 Gh. Polizu, 011061 Bucharest, Romania (V.-A.S.); (B.Ș.V.)
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10
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Peng D, Zhang Z, Zhang J, Yang Y. Improving Photocatalytic Activity for Formaldehyde Degradation by Encapsulating C 60 Fullerenes into Graphite-like C 3N 4 through the Enhancement of Built-in Electric Fields. Molecules 2023; 28:5815. [PMID: 37570785 PMCID: PMC10420677 DOI: 10.3390/molecules28155815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/07/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
The photocatalytic degradation of formaldehyde by graphite-like C3N4 is one of the most attractive and environmentally friendly strategies to address the significant threat to human health posed by indoor air pollutants. Despite its potential, this degradation process still faces issues with suboptimal efficiency, which may be attributed to the rapid recombination of photogenerated excitons and the broad band gap. As a proof of concept, a series of graphite-like C3N4@C60 composites combining graphite-like C3N4 and C60 was developed via an in situ generation strategy. The obtained graphite-like C3N4@C60 composites exhibited a remarkable increase in the photocatalytic degradation efficiency of formaldehyde, of up to 99%, under visible light irradiation, outperforming pure graphite-like C3N4 and C60. This may be due to the composites' enhanced built-in electric field. Additionally, the proposed composites maintained a formaldehyde removal efficiency of 84% even after six cycles, highlighting their potential for indoor air purification and paving the way for the development of efficient photocatalysts.
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Affiliation(s)
- Dongmei Peng
- College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha 410000, China; (D.P.); (J.Z.); (Y.Y.)
- Green Furniture Engineering Technology Research Center, National Forestry & Grassland Administration, Changsha 410004, China
- Green Home Engineering Technology Research Center, Changsha 410004, China
| | - Zhongfeng Zhang
- College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha 410000, China; (D.P.); (J.Z.); (Y.Y.)
- Green Furniture Engineering Technology Research Center, National Forestry & Grassland Administration, Changsha 410004, China
- Green Home Engineering Technology Research Center, Changsha 410004, China
| | - Jijuan Zhang
- College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha 410000, China; (D.P.); (J.Z.); (Y.Y.)
- Green Furniture Engineering Technology Research Center, National Forestry & Grassland Administration, Changsha 410004, China
- Green Home Engineering Technology Research Center, Changsha 410004, China
| | - Yang Yang
- College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha 410000, China; (D.P.); (J.Z.); (Y.Y.)
- Green Furniture Engineering Technology Research Center, National Forestry & Grassland Administration, Changsha 410004, China
- Green Home Engineering Technology Research Center, Changsha 410004, China
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11
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Chang Y, Zhang Y, Hu T, Chen W, Tang T, Luo E, Jia J. Carbonaceous Material Modified MoO 2 Nanospheres with Oxygen Vacancies for Enhanced Visible-Light Photocatalytic Oxidative Coupling of Benzylamine. Molecules 2023; 28:4739. [PMID: 37375295 DOI: 10.3390/molecules28124739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 06/10/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023] Open
Abstract
Surface oxygen vacancy (OV) plays a pivotal role in the activation of molecular oxygen and separation of electrons and holes in photocatalysis. Herein, carbonaceous materials-modified MoO2 nanospheres with abundant surface OVs (MoO2/C-OV) were successfully synthesized via glucose hydrothermal processes. In situ introduction of carbonaceous materials triggered a reconstruction of the MoO2 surface, which introduced abundant surface OVs on the MoO2/C composites. The surface oxygen vacancies on the obtained MoO2/C-OV were confirmed via electron spin resonance spectroscopy (ESR) and X-ray photoelectron spectroscopy (XPS). The surface OVs and carbonaceous materials boosted the activation of molecular oxygen to singlet oxygen (1O2) and superoxide anion radical (•O2-) in selectively photocatalytic oxidation of benzylamine to imine. The conversion of benzylamine was 10 times that of pristine MoO2 nanospheres with a high selectivity under visible light irradiation at 1 atm air pressure. These results open an avenue to modify Mo-based materials for visible light-driven photocatalysis.
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Affiliation(s)
- Yuhong Chang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Yanxia Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Tianjun Hu
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Wenwen Chen
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Tao Tang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Ergui Luo
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Jianfeng Jia
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
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Qin F, Zhang L, Luo Y, He L, Lu S, Xu L, Zhu X, Feng W. Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites. Molecules 2023; 28:molecules28073187. [PMID: 37049946 PMCID: PMC10095781 DOI: 10.3390/molecules28073187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/27/2023] [Accepted: 03/29/2023] [Indexed: 04/07/2023] Open
Abstract
Ag/TiO2/muscovite (ATM) composites were prepared by the sol–gel method and the effects of Ag modification on the structure and photocatalytic performance were investigated. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller surface area (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FTIR), photoluminescence spectra (PL) and ultraviolet–visible diffuse reflectance spectra (DRS). The photocatalytic activity of the obtained composites was evaluated by taking 100 mL (10 mg/L) of Rhodamine B (RhB) aqueous solution as the target pollutant. The muscovite (Mus) loading releases the agglomeration of TiO2 particles and the specific surface area increases from 17.6 m2/g (pure TiO2) to 39.5 m2/g (TiO2/Mus). The first-order reaction rate constant increases from 0.0009 min−1 (pure TiO2) to 0.0074 min−1 (150%TiO2/Mus). Ag element exists in elemental silver. The specific surface area of 1-ATM further increases to 66.5 m2/g. Ag modification promotes the separation of photogenerated electrons and holes and increases the visible light absorption. 1%Ag-TiO2/Mus (1-ATM) exhibits the highest photocatalytic activity. After 100 min, the rhodamine B (RhB) degradation degrees of PT, 150%TiO2/Mus and 1-ATM are 10.4%, 48.6% and 90.6%, respectively. The first-order reaction rate constant of 1-ATM reaches 0.0225 min−1, which is 25 times higher than that of pure TiO2.
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Affiliation(s)
- Fengqiu Qin
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Ling Zhang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Yuhao Luo
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610051, China
| | - Lili He
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Shiji Lu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Li Xu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610051, China
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
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13
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Kartavova KE, Mashkin MY, Kostin MY, Finashina ED, Kalmykov KB, Kapustin GI, Pribytkov PV, Tkachenko OP, Mishin IV, Kustov LM, Kustov AL. Rhodium-Based Catalysts: An Impact of the Support Nature on the Catalytic Cyclohexane Ring Opening. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:936. [PMID: 36903814 PMCID: PMC10005695 DOI: 10.3390/nano13050936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/23/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Because of the growing demand for high-quality fuels, the light cycle oil fraction improvement including cetane number improvement is important. The main way to reach this improvement is the ring opening of cyclic hydrocarbons, and a highly effective catalyst should be found. Cyclohexane ring openings are a possible option to investigate the catalyst activity. In this work, we investigated rhodium-loaded catalysts prepared using the commercially available industrial supports: single-component ones, SiO2 and Al2O3; and mixed oxides CaO + MgO + Al2O3 and Na2O + SiO2 + Al2O3. The catalysts were prepared by incipient wetness impregnation and investigated by N2 low-temperature adsorption-desorption, XRD, XPS, DRS UV-Vis and DRIFT spectroscopy, SEM, and TEM with EDX. The catalytic tests were performed in cyclohexane ring opening in the range of 275-325 °C. The best result was demonstrated by the sample 1Rh/CaMgAlO: the selectivity to n-hexane was about 75% while the cyclohexane conversion was about 25% at 275 °C. The space-time yield was up to 12 mmoln-hexane gcat-1h-1.
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Affiliation(s)
- Kristina E. Kartavova
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
| | - Mikhail Yu. Mashkin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Mikhail Yu. Kostin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | | | | | | | - Petr V. Pribytkov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Olga P. Tkachenko
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Igor V. Mishin
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Leonid M. Kustov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Alexander L. Kustov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
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14
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Pugazhenthiran N, Sathishkumar P, Albormani O, Murugesan S, Kandasamy M, Selvaraj M, Suresh S, Kumar SK, Contreras D, Váldes H, Mangalaraja RV. Silver nanoparticles modified ZnO nanocatalysts for effective degradation of ceftiofur sodium under UV-vis light illumination. CHEMOSPHERE 2023; 313:137515. [PMID: 36495978 DOI: 10.1016/j.chemosphere.2022.137515] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 11/14/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Light-induced photocatalytic degradation of ceftiofur sodium (CFS) has been assessed in the presence of plasmonic zinc oxide nanostructures (ZnONSTs), like, ZnO nanoparticles, ZnO nanorods (ZnONRs) and ZnO nanoflowers (ZnONFs). Silver nanoparticles (Ag NPs) loaded ZnO nanostructures (Ag-ZnONSTs) are obtained through seed-assisted chemical reaction followed by chemical reduction of silver. The surface modification of ZnO nanostructures by Ag NPs effectually altered their optical properties. Further, the surface plasmonic effect of Ag NPs facilitates visible light absorption by ZnONSTs and improved the photogenerated electron and hole separation, which makes the ZnONSTs a more active photocatalyst than TiO2 (P25) nanoparticles. Especially, Ag-ZnONRs showed higher CFS oxidation rate constant (k' = 4.6 × 10-4 s-1) when compared to Ag-ZnONFs (k' = 2.8 × 10-4 s-1) and Ag-ZnONPs (k' = 2.5 × 10-4 s-1), owing to their high aspect ratio (60:1). The unidirectional transport of photogenerated charge carriers on the Ag-ZnONRs may be accountable for the observed high photocatalytic oxidation of CFS. The photocatalytic oxidation of CFS mainly proceeds through •OH radicals generated on the Ag-ZnONRs surface under light illumination. In addition, heterogeneous activation of peroxymonosulfate by Ag-ZnONRs accelerates the rate of photocatalytic mineralization of CFS. The quantification of oxidative radicals supports the proposed CFS oxidation mechanism. Stability studies of plasmonic Ag-ZnONSTs strongly suggests that it could be useful to clean large volume of pharmaceutical wastewater under direct solar light irradiation.
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Affiliation(s)
- N Pugazhenthiran
- Laboratorio de Fotoquímica y Fotofísica, Departamento de Química, Universidad Técnica Federico Santa María, Campus Casa Central, Av. España 1680, Valparaíso, Chile.
| | - P Sathishkumar
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology (VIT), Vellore, 632 014, India
| | - Omeer Albormani
- Department of Chemistry, Faculty of Science, King Khalid University, Abha-61413, Saudi Arabia
| | - S Murugesan
- Department of Inorganic Chemistry, School of Chemistry Madurai Kamaraj University, Madurai-625021, Tamil Nadu, India.
| | - M Kandasamy
- Department of Chemistry, K. Ramakrishnan College of Technology, Tiruchirappalli-621 112, Tamil Nadu, India
| | - M Selvaraj
- Department of Chemistry, Faculty of Science, King Khalid University, Abha-61413, Saudi Arabia.
| | - S Suresh
- PG & Research Department of Physics, Sri Vidya Mandir Arts & Science College (Autonomous), Katteri-636 902, Uthangarai, Tamil Nadu, India
| | - S Karthick Kumar
- Department of Physics, Sethu Institute of Technology, Kariapatti-626115, Virudhunagar, Tamil Nadu, India
| | - D Contreras
- Department of Analytical and Inorganic Chemistry, Faculty of Chemical Sciences, University of Concepcion, Concepcion 4070409, Chile
| | - H Váldes
- Laboratorio de Tecnologías Limpias, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - R V Mangalaraja
- Faculty of Engineering and Science, Universidad Adolfo Ibáñez, Diagonal las Torres 2640, Peñalolén, Santiago, Chile
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15
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Halloysite nanotubes supported BiVO4/BaSnO3 p-n heterojunction photocatalysts for the enhanced degradation of methylene blue under visible light. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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16
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Vikal S, Gautam YK, Meena S, Parewa V, Kumar A, Kumar A, Meena S, Kumar S, Singh BP. Surface functionalized silver-doped ZnO nanocatalyst: a sustainable cooperative catalytic, photocatalytic and antibacterial platform for waste treatment. NANOSCALE ADVANCES 2023; 5:805-819. [PMID: 36756497 PMCID: PMC9890675 DOI: 10.1039/d2na00864e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 12/28/2022] [Indexed: 05/30/2023]
Abstract
The different dyes used and discharged in industrial settings and microbial pathogenic issues have raised serious concerns about the content of bodies of water and the impact that dyes and microbes have on the environment and human health. Efficient treatment of contaminated water is thus a major challenge that is of great interest to researchers around the world. In the present work, we have fabricated functionalized silver-doped ZnO nanoparticles (Ag-doped ZnO NPs) via a hydrothermal method for wastewater treatment. X-ray photoelectron spectroscopy analysis confirmed the doping of Ag with ZnO NPs, and X-ray diffractometry analysis showed a decreasing trend in the crystallite size of the synthesized ZnO NPs with increased Ag concentration. Field emission scanning electron microscopy study of pure ZnO NPs and Ag-doped ZnO NPs revealed nanocrystal aggregates with mixed morphologies, such as hexagonal and rod-shaped structures. Distribution of Ag on the ZnO lattice is confirmed by high-resolution transmission electron microscopy analysis. ZnO NPs with 4 wt% Ag doping showed a maximum degradation of ∼95% in 1.5 h of malachite green dye (80 mg L-1) under visible light and ∼85% in 4 h under dark conditions. Up to five successive treatment cycles using the 4 wt% Ag-doped ZnO NP nanocatalyst confirmed its reusability, as it was still capable of degrading ∼86% and 82% of the dye under visible light and dark conditions, respectively. This limits the risk of nanotoxicity and aids the cost-effectiveness of the overall treatment process. The synthesized NPs showed antibacterial activity in a dose-dependent manner. The zone of inhibition of the Ag-doped ZnO NPs was higher than that of the pure ZnO NPs for all doping content. The studied Ag-doped ZnO NPs thus offer a significant eco-friendly route for the effective treatment of water contaminated with synthetic dyes and fecal bacterial load.
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Affiliation(s)
- Sagar Vikal
- Smart Materials and Sensor Laboratory, Department of Physics, Ch. Charan Singh University Meerut 250004 Uttar Pradesh India
| | - Yogendra K Gautam
- Smart Materials and Sensor Laboratory, Department of Physics, Ch. Charan Singh University Meerut 250004 Uttar Pradesh India
| | - Swati Meena
- Centre of Advanced Studies, Department of Chemistry, University of Rajasthan Jaipur India
| | - Vijay Parewa
- Centre of Advanced Studies, Department of Chemistry, University of Rajasthan Jaipur India
| | - Ashwani Kumar
- Nanoscience Laboratory, Institute Instrumentation Centre, IIT Roorkee Roorkee 247667 India
| | - Ajay Kumar
- Department of Biotechnology, Mewar Institute of Management Ghaziabad 201012 Uttar Pradesh India
| | - Sushila Meena
- Centre of Advanced Studies, Department of Chemistry, University of Rajasthan Jaipur India
| | - Sanjay Kumar
- Department of Physics, University of Rajasthan Jaipur 302004 India
| | - Beer Pal Singh
- Smart Materials and Sensor Laboratory, Department of Physics, Ch. Charan Singh University Meerut 250004 Uttar Pradesh India
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17
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Khalameida S, Samsonenko M, Khyzhun O, Sydorchuk V, Starchevskyy V, Charmas B, Skwarek E. Sono- and mechanochemical doping of tin dioxide with silver and its physicochemical characteristics and photocatalytic properties. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04865-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Dhakshinamoorthy A, López-Francés A, Navalon S, Garcia H. Graphitic Carbon Nitride as Visible-Light Photocatalyst Boosting Ozonation in Wastewater Treatment. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3494. [PMID: 36234622 PMCID: PMC9565898 DOI: 10.3390/nano12193494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 09/26/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Light can boost ozone efficiency in advanced oxidation processes (AOPs), either by direct ozone photolysis with UV light or by using a photocatalyst that can be excited with UV-Vis or solar light. The present review summarizes literature data on the combination of ozone and the g-C3N4 photocatalyst for the degradation of probe molecules in water, including oxalic, p-hydroxybenzoic and oxamic acids as well as ciprofloxacin and parabens. g-C3N4 is a metal-free visible-light photocatalyst based on abundant elements that establishes a synergistic effect with ozone, the efficiency of the combination of the photocatalysis and ozonation being higher than the sum of the two treatments independently. Available data indicate that this synergy derives from the higher efficiency in the generation of hydroxyl radicals due to the efficient electron quenching by O3 of photogenerated conduction band electrons in the g-C3N4 photocatalyst. Given the wide use of ozonizers in water treatment, it is proposed that their implementation with g-C3N4 photocatalysis could also boost ozone efficiency in the AOPs of real waste waters.
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Affiliation(s)
- Amarajothi Dhakshinamoorthy
- Department of Chemistry, Universitat Politècnica de València, C/Camino de Vera, s/n, 46022 Valencia, Spain
- School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India
| | - Antón López-Francés
- Department of Chemistry, Universitat Politècnica de València, C/Camino de Vera, s/n, 46022 Valencia, Spain
| | - Sergio Navalon
- Department of Chemistry, Universitat Politècnica de València, C/Camino de Vera, s/n, 46022 Valencia, Spain
| | - Hermenegildo Garcia
- Instituto Universitario de Tecnología Química, Consejo Superior de Investigaciones Científicas-Universitat Politècnica de València, Universitat Politècnica de València, Av. De los Naranjos s/n, 46022 Valencia, Spain
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19
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Zhu X, Qin F, He L, Jiao Y, Feng W. Enhanced Photocatalytic Activity of Anatase/Rutile Heterojunctions by Lanthanum and Tin Co-Doping. Int J Mol Sci 2022; 23:11339. [PMID: 36232637 PMCID: PMC9569733 DOI: 10.3390/ijms231911339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 09/11/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022] Open
Abstract
Anatase/rutile heterojunctions were prepared using the sol-gel method and modified by La/Sn single doping and co-doping. Sn doping promoted the transformation from anatase to rutile, while La doping inhibited the phase transformation. La and Sn co-doping showed an inhibitory effect. The co-doping of La and Sn did not increase visible-light absorption, but exhibited a synergistic effect on inhibiting the recombination of photogenerated electrons and holes, which improved the photocatalytic activity on the basis of single-element modification. The first-order reaction rate constant of La/Sn co-doped sample was 0.027 min-1, which is 1.8 times higher than that of pure TiO2 (0.015 min-1). Meanwhile, the mechanism of photodegradation of methylene blue (MB) by La/Sn co-doped anatase/rutile heterojunctions was discussed through electrochemical measurements and free-radical trapping experiments.
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Affiliation(s)
- Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Fengqiu Qin
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Lili He
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Yu Jiao
- School of Science, Xichang University, Xichang 615013, China
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
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20
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In situ facile green synthesis of Ag-ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection. Sci Rep 2022; 12:15359. [PMID: 36100625 PMCID: PMC9470730 DOI: 10.1038/s41598-022-19403-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/29/2022] [Indexed: 11/08/2022] Open
Abstract
In this work, Ag–ZnO nanocomposites were prepared by a green synthesis route using aqueous leaf extract of Tetradenia riperia and investigated for antibacterial activity against Escherichia coli and Staphylococcus aureus. To optimize the synthesis of the Ag–ZnO, the effects of precursor concentrations, pH, and temperatures were studied. The Ag–ZnO nanocomposites were characterized by XRD, ATR-FTIR, FESEM, and TEM. Results show that the concentration of 8% Ag, the temperature of 80 °C, and a pH of 7–8 were optimal for the synthesis of Ag–ZnO nanocomposites. The XRD analysis showed the decrease in particle size of Ag–ZnO from 23.6 to 14.8 nm with an increase in Ag concentrations, which was further supported by FESEM analysis. TEM image of 8% Ag provides more information on the coexistence of Ag on ZnO where an average particle size of 14.8 nm was determined. The ATR-FTIR analysis confirmed the presence of phenolic compounds, which work as reducing and stabilizing agents. The antimicrobial activity results show that Ag–ZnO nanocomposite demonstrated a higher antimicrobial potency on E. coli than on S. aureus. Therefore, Tetradenia riperia leaf extract is a viable route for the synthesis of Ag–ZnO nanocomposites to be used for various applications, including water disinfection.
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21
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Em S, Yedigenov M, Khamkhash L, Atabaev S, Molkenova A, Poulopoulos SG, Atabaev TS. Uncovering the Role of Surface-Attached Ag Nanoparticles in Photodegradation Improvement of Rhodamine B by ZnO-Ag Nanorods. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2882. [PMID: 36014747 PMCID: PMC9412419 DOI: 10.3390/nano12162882] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/13/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
ZnO nanorods decorated with metal nanoparticles have sparked considerable interest in recent years thanks to their suitability for a wide range of applications, such as photocatalysis, photovoltaics, antibacterial activity, and sensing devices. In this study, we prepared and investigated the improved solar-light-assisted photocatalytic activity of ZnO nanorods (NRs) decorated with Ag nanoparticles (NPs) using a conventional rhodamine B (RB) dye as a model water pollutant. We showed that the presence of Ag NPs on the surface of ZnO NRs significantly increases the degradation rate of RB dye (~0.2432 min-1) when compared to bare ZnO NRs (~0.0431 min-1). The improved photocatalytic activity of ZnO-Ag was further experimentally tested using radical scavengers. The obtained results reveal that ˙OH and ˙O2- radicals are main active species involved in the RB dye photodegradation by ZnO-Ag NRs. It was concluded that efficient charge separation plays a major role in photocatalytic activity improvement.
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Affiliation(s)
- Svetlana Em
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
| | - Mussa Yedigenov
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
| | - Laura Khamkhash
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
| | - Shanazar Atabaev
- Department of Professional Disciplines, Academy of the Ministry of Emergency Situations, Tashkent 100102, Uzbekistan
| | - Anara Molkenova
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
- Institute of Advanced Organic Materials, Pusan National University, Busan 46241, Korea
| | - Stavros G. Poulopoulos
- Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
| | - Timur Sh. Atabaev
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
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22
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Matos RS, Attah-Baah JM, Monteiro MDS, Costa BFO, Mâcedo MA, Da Paz SPA, Angélica RS, de Souza TM, Ţălu Ş, Oliveira RMPB, Ferreira NS. Evaluation of the Photocatalytic Activity of Distinctive-Shaped ZnO Nanocrystals Synthesized Using Latex of Different Plants Native to the Amazon Rainforest. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2889. [PMID: 36014752 PMCID: PMC9416145 DOI: 10.3390/nano12162889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/17/2022] [Accepted: 08/20/2022] [Indexed: 06/15/2023]
Abstract
ZnO nanocrystals with three different morphologies have been synthesized via a simple sol-gel-based method using Brosimum parinarioides (bitter Amapá) and Parahancornia amapa (sweet Amapá) latex as chelating agents. X-ray diffraction (XRD) and electron diffraction patterns (SAED) patterns showed the ZnO nanocrystals were a pure hexagonal wurtzite phase of ZnO. XRD-based spherical harmonics predictions and HRTEM images depicted that the nanocrystallites constitute pitanga-like (~15.8 nm), teetotum-like (~16.8 nm), and cambuci-like (~22.2 nm) shapes for the samples synthesized using bitter Amapá, sweet Amapá, and bitter/sweet Amapá chelating agent, respectively. The band gap luminescence was observed at ~2.67-2.79 eV along with several structural defect-related, blue emissions at 468-474 nm (VO, VZn, Zni), green emissions positioned at 513.89-515.89 (h-VO+), and orange emission at 600.78 nm (VO+-VO++). The best MB dye removal efficiency (85%) was mainly ascribed to the unique shape and oxygen vacancy defects found in the teetotum-like ZnO nanocrystals. Thus, the bitter Amapá and sweet Amapá latex are effective chelating agents for synthesizing distinctive-shaped ZnO nanocrystals with highly defective and remarkable photocatalytic activity.
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Affiliation(s)
- Robert S. Matos
- Postgraduate Program in Materials Science and Engineering (P2CEM), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil
- Amazonian Materials Group, Federal University of Amapá (UNIFAP), Macapá 68911-477, AP, Brazil
| | - John M. Attah-Baah
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil
| | - Michael D. S. Monteiro
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil
| | - Benilde F. O. Costa
- University of Coimbra, CFisUC, Department of Physics, P-3004-516 Coimbra, Portugal
| | - Marcelo A. Mâcedo
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil
| | - Simone P. A. Da Paz
- Institute of Geosciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Rômulo S. Angélica
- Institute of Geosciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Tiago M. de Souza
- Núcleo de Engenharia de Materiais Sustentáveis (NEMaS), Universidade do Estado do Amapá, Macapá 68900-070, AP, Brazil
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, 15 Constantin Daicoviciu St., 400020 Cluj-Napoca, Romania
| | - Rosane M. P. B. Oliveira
- Postgraduate Program in Materials Science and Engineering (P2CEM), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil
| | - Nilson S. Ferreira
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil
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Zhu X, Qin F, Zhang X, Zhong Y, Wang J, Jiao Y, Luo Y, Feng W. Synthesis of Tin-Doped Three-Dimensional Flower-like Bismuth Tungstate with Enhanced Photocatalytic Activity. Int J Mol Sci 2022; 23:ijms23158422. [PMID: 35955557 PMCID: PMC9369453 DOI: 10.3390/ijms23158422] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/25/2022] [Accepted: 07/27/2022] [Indexed: 12/14/2022] Open
Abstract
Photocatalytic degradation of harmful organic matter is a feasible and environmentally friendly method. Bi2WO6 has become a hotspot of photocatalysts because of its unique layered structure and visible light response. In the present study, Sn doping was adopted to modified Bi2WO6 by hydrothermal method. The Sn-doped Bi2WO6 photocatalysts were characterized by XRD, SEM, TEM, BET, XPS, PL, and DRS, respectively. The results show that Sn-doped Bi2WO6 shows three-dimensional (3D) flower-like morphology, which is composed of two-dimensional (2D) nanosheets. Sn4+ ions enter into the Bi2WO6 lattice, producing a degree of Bi2WO6 lattice distortion, which is in favor of reducing the recombination of photogenerated electrons and holes. Moreover, the specific surface area of Bi2WO6 is significantly increased after doping, which is beneficial to providing more active sites. The photocatalytic results show that 2%Sn-Bi2WO6 exhibits the highest photocatalytic activity. After 60 min of irradiation, the photocatalytic degradation degree of methylene blue (MB) increases from 80.6% for pure Bi2WO6 to 92.0% for 2%Sn-Bi2WO6. The first-order reaction rate constant of 2%Sn-Bi2WO6 is 0.030 min−1, which is 1.7 times than that of pure Bi2WO6.
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Affiliation(s)
- Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (X.Z.); (Y.Z.); (J.W.)
| | - Fengqiu Qin
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (X.Z.); (Y.Z.); (J.W.)
| | - Xiuping Zhang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (X.Z.); (Y.Z.); (J.W.)
| | - Yuanyuan Zhong
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (X.Z.); (Y.Z.); (J.W.)
| | - Juan Wang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (X.Z.); (Y.Z.); (J.W.)
| | - Yu Jiao
- School of Science, Xichang University, Xichang 615013, China
- Correspondence: (Y.J.); (W.F.)
| | - Yuhao Luo
- College of Materials and Chemistry & Chemiacl Engineering, Chengdu University of Technology, Chengdu 610051, China;
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (X.Z.); (Y.Z.); (J.W.)
- Correspondence: (Y.J.); (W.F.)
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24
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Teng W, Xu J, Yu J, Cong S, Yan X. Experimental and quantum chemical investigation on the mechanism of photocatalytic degradation of 2,4,6-trichlorophenol by Ag/TiO2 nanotube electrode. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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25
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“Fe3+ modified zinc oxide nanomaterial as an efficient, multifaceted material for photocatalytic degradation of MB dye and ethanol gas sensor as part of environmental rectification”. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Preparation, Characterization of ZnTiO 3/ZnO Composite Materials and Their Photocatalytic Performance. NANOMATERIALS 2022; 12:nano12081345. [PMID: 35458053 PMCID: PMC9031329 DOI: 10.3390/nano12081345] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 04/12/2022] [Accepted: 04/13/2022] [Indexed: 02/01/2023]
Abstract
With zinc acetate and butyl titanate as raw materials, pure ZnO and ZnTiO3/ZnO composite photocatalysts were synthesized by a sol-gel method and calcined at 550 °C. The crystal structure, morphology, surface area, optical property, and element valence states of samples were characterized and the photocatalytic activity of the prepared photocatalysts were assessed by the degradation of rhodamine B. Results show that the crystal structure of ZnO is a hexagonal wurtzite phase with a band gap of 3.20 eV. When the Zn/Ti molar ratio reaches 0.2, ZnTiO3 phase appears and ZnTiO3/ZnO composite forms, which advances the transfer of photogenerated charges. ZnTiO3/ZnO (Ti/Zn = 0.2) exhibits the highest photocatalytic activity, and the degradation degree of RhB reaches 99% after 60 min, which is higher than that of pure ZnO (90%). An exorbitant Ti/Zn molar ratio will reduce the crystallinity and form more amorphous components, which is not conducive to photocatalytic performance. Therefore, when the Ti/Zn molar ratio exceeds 0.2, the photocatalytic activities of ZnTiO3/ZnO composites decrease.
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