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He C, He J, Cui S, Fan X, Li S, Yang Y, Tan X, Zhang X, Mao J, Zhang L, Deng C. Novel Effective Photocatalytic Self-Cleaning Coatings: TiO 2-Polyfluoroalkoxy Coatings Prepared by Suspension Plasma Spraying. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:3123. [PMID: 38133021 PMCID: PMC10745750 DOI: 10.3390/nano13243123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 11/11/2023] [Accepted: 11/14/2023] [Indexed: 12/23/2023]
Abstract
Photocatalytic coatings can degrade volatile organic compounds into non-toxic products, which has drawn the attention of scholars around the world. However, the pollution of dust on the coating adversely affects the photocatalytic efficiency and service life of the coating. Here, a series of TiO2-polyfluoroalkoxy (PFA) coatings with different contents of PFA were fabricated by suspension plasma spraying technology. The results demonstrate that the hybrid coatings contain a large number of circular and ellipsoidal nanoparticles and a porous micron-nano structure due to the inclusion of PFA. According to the optimized thermal spraying process parameters, TiO2 nanoparticles were partially melted to retain most of the anatase phases, whereas PFA did not undergo significant carbonization. As compared to the TiO2 coating, the static contact angle of the composite coating doped with 25 wt.% PFA increased from 28.2° to 134.1°. In addition, PFA strongly adsorbs methylene blue, resulting in a greater involvement of methylene blue molecules in the catalyst, where the catalytic rate of hybrid coatings is up to 95%. The presented nanocomposite coatings possess excellent photocatalytic and self-cleaning properties and are expected to find wider practical applications in the field of photocatalysis.
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Affiliation(s)
- Chunyan He
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Jialin He
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
- College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
| | - Sainan Cui
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
- Qingdao Haier Refrigerator Co., Ltd., Qingdao 266510, China
| | - Xiujuan Fan
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Shuanjian Li
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Yaqi Yang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Xi Tan
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Xiaofeng Zhang
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Jie Mao
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Liuyan Zhang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
| | - Changguang Deng
- The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
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Jeya P, Keerthana SP, Kungumadevi L, Yuvakkumar R, Ravi G, Kandasami A, Senthil TS. Gamma irradiation effect on photocatalytic properties of Cu and Sr ions codoped PbS. ENVIRONMENTAL RESEARCH 2023; 226:115651. [PMID: 36894113 DOI: 10.1016/j.envres.2023.115651] [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: 12/08/2022] [Revised: 02/28/2023] [Accepted: 03/06/2023] [Indexed: 06/18/2023]
Abstract
Gamma-irradiation effects on photocatalytic action of PbS nanocrystallites codoped with Cu and Sr ions were performed for organic dye degradation. The physical and chemical characterizations of these nanocrystallites were examined employing X-ray diffraction, Raman, and field emission electron microscopic analysis. The optical bandgaps of gamma-irradiated PbS with co-dopants have shifted from 1.95 eV (pristine PbS) to 2.45 eV in the visible spectrum. Under direct sunlight, the photocatalytic action of these compounds against methylene blue (MB) was investigated. Observations indicated that gamma-irradiated Pb(0.98)Cu0.01Sr0.01S nanocrystallite sample exhibits a higher photocatalytic degradation activity of 74.02% in 160 min and stability of 69.4% after three cycles, suggesting that gamma irradiation could potentially influence organic MB degradation. This is due to combined action of high-energy gamma irradiation (at an optimzed dose), which causes sulphur vacancies, and defects created by dopant ions, which alter the crystal structure by inducing strain in the crystal lattice, hence altering the crystallinity of PbS.
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Affiliation(s)
- P Jeya
- Department of Physics, CMS College, MG University, Kottayam, Kerala, India; Department of Physics, Mother Teresa Women's University, Kodaikanal, India
| | - S P Keerthana
- Department of Physics, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India
| | - L Kungumadevi
- Department of Physics, Mother Teresa Women's University, Kodaikanal, India.
| | - R Yuvakkumar
- Department of Physics, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India.
| | - G Ravi
- Department of Physics, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India; Department of Physics, Chandigarh University, Mohali, 140 413, Punjab, India
| | - Asokan Kandasami
- Inter University Accelerator Centre, New Delhi-110067, India; Department of Physics & Centre for Interdisciplinary Research, University of Petroleum and Energy Studies (UPES), Dehradun, India
| | - T S Senthil
- Department of Physics, Erode Sengunthar Engineering College, Erode, India
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Bathe AS, Sanz Arjona A, Regan A, Wallace C, Nerney CR, O'Donoghue N, Crosland JM, Simonian T, Walton RI, Dunne PW. Solvothermal synthesis of soluble, surface modified anatase and transition metal doped anatase hybrid nanocrystals. NANOSCALE ADVANCES 2022; 4:5343-5354. [PMID: 36540114 PMCID: PMC9724697 DOI: 10.1039/d2na00640e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Accepted: 11/03/2022] [Indexed: 06/17/2023]
Abstract
Titanium dioxide, or titania, is perhaps the most well-known and widely studied photocatalytic material, with myriad applications, due to a high degree of tunability achievable through the incorporation of dopants and control of phase composition and particle size. Many of the applications of titanium dioxide require particular forms, such as gels, coatings, or thin films, making the development of hybrid solution processable nanoparticles increasingly attractive. Here we report a simple solvothermal route to highly dispersible anatase phase titanium dioxide hybrid nanoparticles from amorphous titania. Solvothermal treatment of the amorphous titania in trifluoroacetic acid leads to the formation of anatase phase nanoparticles with a high degree of size control and near complete surface functionalisation. This renders the particles highly dispersible in simple organic solvents such as acetone. Dopant ions may be readily incorporated into the amorphous precursor by co-precipitation, with no adverse effect on subsequent crystallisation and surface modification.
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Affiliation(s)
- A S Bathe
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - A Sanz Arjona
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - A Regan
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
- CDT ACM, AMBER, Trinity College Dublin, College Green Dublin 2 Ireland
| | - C Wallace
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - C R Nerney
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - N O'Donoghue
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - J M Crosland
- School of Chemistry, University of Warwick Gibbet Hill Coventry CV4 7AL UK
| | - T Simonian
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
- CDT ACM, AMBER, Trinity College Dublin, College Green Dublin 2 Ireland
| | - R I Walton
- School of Chemistry, University of Warwick Gibbet Hill Coventry CV4 7AL UK
| | - P W Dunne
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
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Synthesis and Characterization of N and Fe-Doped TiO2 Nanoparticles for 2,4-Dimethylaniline Mineralization. NANOMATERIALS 2022; 12:nano12152538. [PMID: 35893506 PMCID: PMC9331849 DOI: 10.3390/nano12152538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 07/20/2022] [Accepted: 07/22/2022] [Indexed: 02/01/2023]
Abstract
The present study aimed to evaluate the feasibility of developing low-cost N- and Fe-doped TiO2 photocatalysts for investigating the mineralization of 2,4-dimethylaniline (2,4-DMA). With a single anatase phase, the photocatalysts showed high thermal stability with mass losses of less than 2%. The predominant oxidative state is Ti4+, but there is presence of Ti3+ associated with oxygen vacancies. In materials with N, doping was interstitial in the NH3/NH4+ form and for doping with Fe, there was a presence of Fe-Ti bonds (indicating substitutional occupations). With an improved band gap energy from 3.16 eV to 2.82 eV the photoactivity of the photocatalysts was validated with an 18 W UVA lamp (340–415 nm) with a flux of 8.23 × 10−6 Einstein s−1. With a size of only 14.45 nm and a surface area of 84.73 m2 g−1, the photocatalyst doped with 0.0125% Fe mineralized 92% of the 2,4-DMA in just 180 min. While the 3% N photocatalyst with 12.27 nm had similar performance at only 360 min. Factors such as high surface area, mesoporous structure and improved Ebg, and absence of Fe peak in XPS analysis indicate that doping with 0.0125% Fe caused a modification in TiO2 structure.
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