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Highly resilient carbon nanotubes/ poly (vinylidene fluoride) colloidal coated knitted fabrics as proficient sensing and energy harvesting implements. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
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Bhangi BK, Ray S. Adsorption and photocatalytic degradation of tetracycline from water by kappa‐carrageenan and iron oxide nanoparticle‐filled poly (
acrylonitrile‐co‐N
‐vinyl pyrrolidone) composite gel. POLYM ENG SCI 2022. [DOI: 10.1002/pen.26202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Bidyut Kumar Bhangi
- Department of Polymer Science and Technology University of Calcutta Kolkata India
| | - SamitKumar Ray
- Department of Polymer Science and Technology University of Calcutta Kolkata India
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Náfrádi M, Alapi T, Farkas L, Bencsik G, Kozma G, Hernádi K. Wavelength Dependence of the Transformation Mechanism of Sulfonamides Using Different LED Light Sources and TiO 2 and ZnO Photocatalysts. MATERIALS (BASEL, SWITZERLAND) 2021; 15:49. [PMID: 35009197 PMCID: PMC8745830 DOI: 10.3390/ma15010049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 12/17/2021] [Accepted: 12/21/2021] [Indexed: 05/04/2023]
Abstract
The comparison of the efficiency of the commercially available photocatalysts, TiO2 and ZnO, irradiated with 365 nm and 398 nm light, is presented for the removal of two antibiotics, sulfamethazine (SMT) and sulfamethoxypyridazine (SMP). The •OH formation rate was compared using coumarin, and higher efficiency was proved for TiO2 than ZnO, while for 1,4-benzoquinone in O2-free suspensions, the higher contribution of the photogenerated electrons to the conversion was observed for ZnO than TiO2, especially at 398 nm irradiation. An extremely fast transformation and high quantum yield of SMP in the TiO2/LED398nm process were observed. The transformation was fast in both O2 containing and O2-free suspensions and takes place via desulfonation, while in other cases, mainly hydroxylated products form. The effect of reaction parameters (methanol, dissolved O2 content, HCO3- and Cl-) confirmed that a quite rarely observed energy transfer between the excited state P25 and SMP might be responsible for this unique behavior. In our opinion, these results highlight that "non-conventional" mechanisms could occur even in the case of the well-known TiO2 photocatalyst, and the effect of wavelength is also worth investigating.
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Affiliation(s)
- Máté Náfrádi
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary; (M.N.); (L.F.)
| | - Tünde Alapi
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary; (M.N.); (L.F.)
| | - Luca Farkas
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary; (M.N.); (L.F.)
| | - Gábor Bencsik
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary;
| | - Gábor Kozma
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary;
| | - Klára Hernádi
- Institute of Physical Metallurgy, Metal Forming and Nanotechnology, University of Miskolc, C/2-5 Building 209, H-3515 Miskolc-Egyetemvaros, Hungary;
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Zanrosso CD, Miranda SM, M. da Costa Filho B, Espíndola JC, Piazza D, J. P. Vilar V, A. Lansarin M. ZnO Polymeric Composite Films for n-Decane Removal from Air Streams in a Continuous Flow NETmix Photoreactor under UVA Light. NANOMATERIALS 2021; 11:nano11081983. [PMID: 34443814 PMCID: PMC8399343 DOI: 10.3390/nano11081983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/27/2021] [Accepted: 07/29/2021] [Indexed: 11/16/2022]
Abstract
Polymeric composite films have been explored for many photocatalytic applications, from water treatment to self-cleaning devices. Their properties, namely, thickness and porosity, are controlled mainly by the preparation conditions. However, little has been discussed on the effect of thickness and porosity of polymeric composite films for photocatalytic processes, especially in gas phase. In the present study, different preparation treatments of ZnO-based polymeric composite films and their effects on its performance and stability were investigated. The polymeric composites were prepared by solution mixing followed by non-solvent induced phase separation (NIPS), using poly(vinylidene fluoride) (PVDF) as the matrix and ZnO-based photocatalysts. Different wet thickness, photocatalyst mass, and treatments (e.g., using or not pore-forming agent and compatibilizer) were assessed. A low ZnO/PVDF ratio and higher wet thickness, together with the use of pore-forming agent and compatibilizer, proved to be a good strategy for increasing photocatalytic efficiency given the low agglomerate formation and high polymer transmittance. Nonetheless, the composites exhibited deactivation after several minutes of exposure. Characterization by XRD, FTIR-ATR, and SEM were carried out to further investigate the polymeric film treatments and stability. ZnO film was most likely deactivated due to zinc carbonate formation intensified by the polymer presence.
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Affiliation(s)
- Crissie D. Zanrosso
- Chemical Engineering Department, Federal University of Rio Grande do Sul, R. Ramiro Barcelos 2777, Porto Alegre 90035-007, Brazil;
| | - Sandra M. Miranda
- Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; (S.M.M.); (B.M.d.C.F.); (J.C.E.)
| | - Batuira M. da Costa Filho
- Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; (S.M.M.); (B.M.d.C.F.); (J.C.E.)
| | - Jonathan C. Espíndola
- Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; (S.M.M.); (B.M.d.C.F.); (J.C.E.)
- School of Civil Engineering, Architecture and Urban Design, University of Campinas, Campinas 13083-852, Brazil
| | - Diego Piazza
- Laboratory of Polymers, Center for Exact Sciences and Technology, University of Caxias do Sul, R. Francisco Getúlio Vargas 1130, Caxias do Sul 95070-560, Brazil;
| | - Vítor J. P. Vilar
- Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; (S.M.M.); (B.M.d.C.F.); (J.C.E.)
- Correspondence: (V.J.P.V.); (M.A.L.)
| | - Marla A. Lansarin
- Chemical Engineering Department, Federal University of Rio Grande do Sul, R. Ramiro Barcelos 2777, Porto Alegre 90035-007, Brazil;
- Correspondence: (V.J.P.V.); (M.A.L.)
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Production of calcium nitrate crystals via membrane distillation crystallization using polyvinylidene fluoride/sorbitan trioleate membranes. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.02.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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