Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO
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This study presents the advances in the field of ZnO/Ag catalysts from the synthesis of hierarchical ZnO nanowires (NWs) decorated with Ag nanoparticles, prepared by a facile solvothermal method at 120°C. It evaluates the photocatalytic efficiency from studying the time reaction of Ag/Zn concentration ratio and the presence of cetyltrimethylammonium bromide (CTAB) as an organic dispersant. X-ray diffraction, scanning electron microscopy, and analytical/high-resolution transmission electron microscopy results confirmed the presence of homogeneous cylindrical ZnO nanowires and quasi-spherical Ag crystals. ZnO NWs exhibited hexagonal wurtzite structure and cubic FCC symmetry in Ag nanoparticles (NPS). Two types of nanostructures, including homogeneous cylindrical ZnO NWs in the absence of Ag and simultaneous presence of ZnO NWs and Ag NPs, formed depending on experimental conditions. The photocatalytic activity was evaluated by studying methylene blue (MB) degradation time under UV light ...excitation. Diffuse reflectance UV–Vis spectrophotometry (UV–Vis DRS) allowed identifying the ZnO absorption band at ~393 nm. Crystal size varied depending on the reaction time and the addition of CTAB. Synthesis time increased bandgap values, getting better photocatalytic performance in samples synthesized in intermediate times (6 h), higher Ag+/Zn2+ molar ratio (0.2/1.0), and CTAB. According to HRTEM observations, the presence of silver nanocrystals with high content of defects (twinning, stacking faults) could play an essential role in the photocatalytic response. In this context, the specific synthesis conditions of Ag/ZnO might be more appropriate for their use in organic dyes degradation in water and the potential use in protective treatments against materials biodeterioration processes. © 2022 The Authors
Кључне речи:
Molar ratio / Zinc sulfide / Scanning electron microscopy / Nanowires / II-VI semiconductors / Aromatic compounds / ZnO nanowires / photocatalysis / photocatalytic activity / synthesis (chemical) / high resolution transmission electron microscopy / metal nanoparticles / photocatalytic efficiency / cetyltrimethylammonium bromide / ZnO nanoparticles / silver nanoparticles / Ag/ZnO / nanocatalysts / solvothermal method / concentration ratio / Ag catalysts / nanoscale defects / nanostructured system / nanostructured systemsИзвор:
Materials Characterization, 2022, 185Финансирање / пројекти:
- Innovation and Education Ministry of Spain (ref. MAT2013-47460-C5-5-P and MAT2016-80875-C3-3-R)
- Autonomous Region Program of Madrid (ref. S2018/NMT-4411 and S2013/MIT-2862)
- Geomateriales 2 program (S2013/MIT_2914)
- TOP Heritage (P2018/NMT-4372) of the Community of Madrid
- Innovation and Education Ministry (MAT201347460-C5-5-P)
- Рационални дизајн и синтеза биолошки активних и координационих једињења и функционалних материјала, релевантних у (био)нанотехнологији (RS-MESTD-Basic Research (BR or ON)-172035)
- Материјали редуковане димензионалности за ефикасну апсорпцију светлости и конверзију енергије (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45020)
DOI: 10.1016/j.matchar.2021.111718
ISSN: 1044-5803
WoS: 000766146900005
Scopus: 2-s2.0-85123033953
Институција/група
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - JOUR AU - Muñoz-Fernandez, Lidia AU - Gómez-Villalba, Luz Stella AU - Milošević, Olivera AU - Rabanal, Maria Eugenia PY - 2022 UR - https://dais.sanu.ac.rs/123456789/13517 AB - This study presents the advances in the field of ZnO/Ag catalysts from the synthesis of hierarchical ZnO nanowires (NWs) decorated with Ag nanoparticles, prepared by a facile solvothermal method at 120°C. It evaluates the photocatalytic efficiency from studying the time reaction of Ag/Zn concentration ratio and the presence of cetyltrimethylammonium bromide (CTAB) as an organic dispersant. X-ray diffraction, scanning electron microscopy, and analytical/high-resolution transmission electron microscopy results confirmed the presence of homogeneous cylindrical ZnO nanowires and quasi-spherical Ag crystals. ZnO NWs exhibited hexagonal wurtzite structure and cubic FCC symmetry in Ag nanoparticles (NPS). Two types of nanostructures, including homogeneous cylindrical ZnO NWs in the absence of Ag and simultaneous presence of ZnO NWs and Ag NPs, formed depending on experimental conditions. The photocatalytic activity was evaluated by studying methylene blue (MB) degradation time under UV light excitation. Diffuse reflectance UV–Vis spectrophotometry (UV–Vis DRS) allowed identifying the ZnO absorption band at ~393 nm. Crystal size varied depending on the reaction time and the addition of CTAB. Synthesis time increased bandgap values, getting better photocatalytic performance in samples synthesized in intermediate times (6 h), higher Ag+/Zn2+ molar ratio (0.2/1.0), and CTAB. According to HRTEM observations, the presence of silver nanocrystals with high content of defects (twinning, stacking faults) could play an essential role in the photocatalytic response. In this context, the specific synthesis conditions of Ag/ZnO might be more appropriate for their use in organic dyes degradation in water and the potential use in protective treatments against materials biodeterioration processes. © 2022 The Authors T2 - Materials Characterization T1 - Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO VL - 185 DO - 10.1016/j.matchar.2021.111718 UR - https://hdl.handle.net/21.15107/rcub_dais_13517 ER -
@article{ author = "Muñoz-Fernandez, Lidia and Gómez-Villalba, Luz Stella and Milošević, Olivera and Rabanal, Maria Eugenia", year = "2022", abstract = "This study presents the advances in the field of ZnO/Ag catalysts from the synthesis of hierarchical ZnO nanowires (NWs) decorated with Ag nanoparticles, prepared by a facile solvothermal method at 120°C. It evaluates the photocatalytic efficiency from studying the time reaction of Ag/Zn concentration ratio and the presence of cetyltrimethylammonium bromide (CTAB) as an organic dispersant. X-ray diffraction, scanning electron microscopy, and analytical/high-resolution transmission electron microscopy results confirmed the presence of homogeneous cylindrical ZnO nanowires and quasi-spherical Ag crystals. ZnO NWs exhibited hexagonal wurtzite structure and cubic FCC symmetry in Ag nanoparticles (NPS). Two types of nanostructures, including homogeneous cylindrical ZnO NWs in the absence of Ag and simultaneous presence of ZnO NWs and Ag NPs, formed depending on experimental conditions. The photocatalytic activity was evaluated by studying methylene blue (MB) degradation time under UV light excitation. Diffuse reflectance UV–Vis spectrophotometry (UV–Vis DRS) allowed identifying the ZnO absorption band at ~393 nm. Crystal size varied depending on the reaction time and the addition of CTAB. Synthesis time increased bandgap values, getting better photocatalytic performance in samples synthesized in intermediate times (6 h), higher Ag+/Zn2+ molar ratio (0.2/1.0), and CTAB. According to HRTEM observations, the presence of silver nanocrystals with high content of defects (twinning, stacking faults) could play an essential role in the photocatalytic response. In this context, the specific synthesis conditions of Ag/ZnO might be more appropriate for their use in organic dyes degradation in water and the potential use in protective treatments against materials biodeterioration processes. © 2022 The Authors", journal = "Materials Characterization", title = "Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO", volume = "185", doi = "10.1016/j.matchar.2021.111718", url = "https://hdl.handle.net/21.15107/rcub_dais_13517" }
Muñoz-Fernandez, L., Gómez-Villalba, L. S., Milošević, O.,& Rabanal, M. E.. (2022). Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO. in Materials Characterization, 185. https://doi.org/10.1016/j.matchar.2021.111718 https://hdl.handle.net/21.15107/rcub_dais_13517
Muñoz-Fernandez L, Gómez-Villalba LS, Milošević O, Rabanal ME. Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO. in Materials Characterization. 2022;185. doi:10.1016/j.matchar.2021.111718 https://hdl.handle.net/21.15107/rcub_dais_13517 .
Muñoz-Fernandez, Lidia, Gómez-Villalba, Luz Stella, Milošević, Olivera, Rabanal, Maria Eugenia, "Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO" in Materials Characterization, 185 (2022), https://doi.org/10.1016/j.matchar.2021.111718 ., https://hdl.handle.net/21.15107/rcub_dais_13517 .