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Quiñones C, Posada M, Hormiga A, Peña J, Diaz-Uribe C, Vallejo W, Muñoz-Acevedo A, Roa V, Schott E, Zarate X. Antimicrobial Activity against Fusarium oxysporum f. sp. dianthi of TiO 2/ZnO Thin Films under UV Irradiation: Experimental and Theoretical Study. ACS OMEGA 2024; 9:31546-31555. [PMID: 39072138 PMCID: PMC11270707 DOI: 10.1021/acsomega.4c01287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/17/2024] [Accepted: 04/25/2024] [Indexed: 07/30/2024]
Abstract
We deposited bare TiO2 and TiO2/ZnO thin films to study their antimicrobial capacity against Fusarium oxysporum f. sp. dianthi. The deposit of TiO2 was performed by spin coating and the ZnO thin films were deposited onto the TiO2 surface by plasma-assisted reactive evaporation technique. The characterization of the compounds was carried out by scanning electron microscopy (SEM) and powder X-ray diffraction techniques. Furthermore, density functional theory (DFT) and time-dependent DFT (TDDFT) calculations were performed to support the observed experimental results. Thus, the removal of methylene blue (MB) by adsorption and posterior photocatalytic degradation was studied. Adsorption kinetic results showed that TiO2/ZnO thin films were more efficient in MB removal than bare TiO2 thin films, and the pseudo-second-order model was suitable to describe the experimental results for TiO2/ZnO (q e = 12.9 mg/g; k 2 = 0.14 g/mg/min) and TiO2 thin films (q e = 12.0 mg/g; k 2 = 0.13 g/mg/min). Photocatalytic results under UV irradiation showed that TiO2 thin films reached 10.9% of MB photodegradation (k = 1.0 × 10-3 min-1), whereas TiO2/ZnO thin films reached 20.6% of MB photodegradation (k = 3.9 × 10-3 min-1). Both thin films reduced the photocatalytic efficiency by less than 3% after 4 photocatalytic tests. DFT study showed that the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy gap decreases for the mixed nanoparticle system, showing its increased reactivity. Furthermore, the chemical hardness shows a lower value for the mixed system, whereas the electrophilicity index shows the biggest value, supporting the larger reactivity for the mixed nanoparticle system. Finally, the antimicrobial activity against F. oxysporum f. sp. dianthi showed that bare TiO2 reached a growth reduction of 68% while TiO2/ZnO reached a growth reduction of 90% after 250 min of UV irradiation.
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Affiliation(s)
- Cesar Quiñones
- Facultad
de ingeniería, Programa de ingeniería Química, Universidad de La Salle, Bogotá 111711, Colombia
| | - Martha Posada
- Grupo
de Investigación Ceparium, Universidad
Colegio Mayor de Cundinamarca, Bogotá 111321, Colombia
| | - Angie Hormiga
- Grupo
de Investigación Ceparium, Universidad
Colegio Mayor de Cundinamarca, Bogotá 111321, Colombia
| | - Julian Peña
- Escuela
de negocios, Universidad del Caribe (UNICARIBE), Santo Domingo 11105, República Dominicana
| | - Carlos Diaz-Uribe
- Grupo
de Fotoquímica y Fotobiología, Universidad del Atlántico, Puerto Colombia 81007, Colombia
| | - William Vallejo
- Grupo
de Fotoquímica y Fotobiología, Universidad del Atlántico, Puerto Colombia 81007, Colombia
| | - Amner Muñoz-Acevedo
- Grupo
de Investigación en Química y Biología, Universidad del Norte, Puerto Colombia 81007, Colombia
| | - Vanesa Roa
- Departamento
de Química Inorgánica, Facultad de Química y
Farmacia, Centro de Energía UC, Centro de Investigación
en Nanotecnología y Materiales Avanzados CIEN-UC, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna, 4860 Santiago, Chile
| | - Eduardo Schott
- Departamento
de Química Inorgánica, Facultad de Química y
Farmacia, Centro de Energía UC, Centro de Investigación
en Nanotecnología y Materiales Avanzados CIEN-UC, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna, 4860 Santiago, Chile
| | - Ximena Zarate
- Instituto
de Ciencias Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, Santiago 7500912, Chile
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Huang Z, Ma Q, Sun F. One-Step Photochemical Preparation of CdS/Poly(MMA-co-MAA) Composite with Enhanced Photocatalytic Activity. Chemistry 2024; 30:e202304177. [PMID: 38228508 DOI: 10.1002/chem.202304177] [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: 12/15/2023] [Revised: 01/14/2024] [Accepted: 01/16/2024] [Indexed: 01/18/2024]
Abstract
This paper presents a one-step photochemical method for the preparation of CdS/Poly(MMA-co-MAA) composite photocatalyst, based on the concept of simultaneous photocatalytic polymerization of organic monomers during UV-light induced formation of CdS. The preparation is carried out in an aqueous solution of Na2S2O3, CdSO4, methyl methacrylate (MMA) and methacrylic acid (MAA), under a UV lamp. The continuously formed CdS particles with photocatalytic activity act the role of initiator to directly initiate the copolymerization of MMA and MAA, resulting in the in situ formation of the composite and full contact of the CdS particles with the oxygen-containing groups in the polymer. Taking the photocatalytic degradation of methylene blue as a case study, the composite exhibited significantly higher activity under simulated solar light compared to the pure CdS. By analysis on various data, the enhanced photocatalytic activity is attributed to the enhanced visible light absorption, and especially the high electron-hole separation efficiency caused by the electrostatic interaction between photogenerated holes and carbonyl oxygen atoms with negatively charged features. Furthermore, the composite displays excellent sunlight activity and recyclability, suggesting its potential for practical applications. Such a one-step construction strategy relying only on photo-energy is green, low-cost and promising in obtaining high-performance semiconductor/polymer composite photocatalysts.
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Affiliation(s)
- Zhenxun Huang
- School of Chemistry and Environment Engineering, Hanshan Normal University, Qiao Dong, Chaozhou, 521041, P. R. China
| | - Qingrong Ma
- School of Chemistry and Environment Engineering, Hanshan Normal University, Qiao Dong, Chaozhou, 521041, P. R. China
| | - Fengqiang Sun
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
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Guo C, Huang Z, Long X, Sun Y, Ma P, Zheng Q, Lu H, Yi X, Chen Z. Interfacial electric field construction of hollow PdS QDs/Zn 1-xCd xS solid solution with enhanced photocatalytic hydrogen evolution. NANOSCALE 2024; 16:1147-1155. [PMID: 38186376 DOI: 10.1039/d3nr05518c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
The regulation of hollow morphology, band structure modulation of solid solution, and introduction of cocatalysts greatly promote the separation of electron-hole pairs in photocatalytic processes, which is of great significance for the process of photocatalytic hydrogen evolution (PHE). In this study, we constructed Zn1-xCdxS hollow solid solution photocatalysts using template and ion exchange methods, and successfully loaded PdS quantum dots (PdS QDs) onto the solid solution through in situ sulfidation. Significantly, the 0.5 wt% PdS QDs/Zn0.6Cd0.4S composite material achieved a H2 production rate of 27.63 mmol g-1 h-1 in the PHE process. The hollow structure of the composite material enhances processes such as light reflection and scattering, the band structure modulation of the solid solution enables the electron-hole pairs to reach an optimal exciton recombination balance, and the modification of PdS QDs provides abundant sites for oxidation, thereby promoting the proton reduction and hydrogen evolution rate. This work provides valuable guidance for the rational design of efficient composite PHE catalysts with strong internal electric field.
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Affiliation(s)
- Cheng Guo
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
| | - Zongyi Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xinrui Long
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
| | - Yuchen Sun
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
| | - Pengfei Ma
- Technology Center, China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, China
| | - Quanxing Zheng
- Technology Center, China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, China
| | - Hongliang Lu
- Technology Center, China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, China
| | - Xiaodong Yi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhou Chen
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
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Guo X, Liu X, Wang M, Yan J, Chen Y, Liu S. Unveiling the Origin of Co 3 O 4 Quantum Dots for Photocatalytic Overall Water Splitting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206695. [PMID: 36775877 DOI: 10.1002/smll.202206695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 12/31/2022] [Indexed: 05/11/2023]
Abstract
Spinel cobalt oxide displays excellent photocatalytic performance, especially in solar driven water oxidation. However, the process of water reduction to hydrogen is considered as the Achilles' heel of solar water splitting over Co3 O4 owing to its low conduction band. Enhancement of the water splitting efficiency using Co3 O4 requires deeper insights of the carrier dynamics during water splitting process. Herein, the carrier dynamic kinetics of colloidal Co3 O4 quantum dots-Pt hetero-junctions is studied, which mimics the hydrogen reduction process during water splitting. It is showed that the quantum confinement effect induced by the small QD size raised the conduction band edge position of Co3 O4 QDs, so that the ligand-to-metal charge transfer from 2p state of oxygen to 3d state of Co2+ occurs, which is necessary for overall water splitting and cannot be achieved in Co3 O4 bulk crystals. The findings in this work provide insights of the photocatalytic mechanism of Co3 O4 catalysts and benefit rational design of Co3 O4 -based photocatalytic systems.
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Affiliation(s)
- Xu Guo
- Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Xing Liu
- Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Menglong Wang
- International Research Center for Renewable Energy, State Key Laboratory for Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Junqing Yan
- Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Yubin Chen
- International Research Center for Renewable Energy, State Key Laboratory for Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Shengzhong Liu
- Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
- iChem, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian, 116023, P. R. China
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