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Venkatachalapathy M, Sambathkumar K, Rajasaravanan ME, Uthrakumar R, Kaviyarasu K, Yewale MA, Awad M, Alam MW. Enhanced photocatalytic and electrochemical performance of hydrothermally prepared NiO-doped Co nanocomposites. LUMINESCENCE 2024; 39:e4768. [PMID: 38719590 DOI: 10.1002/bio.4768] [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: 03/09/2024] [Revised: 04/13/2024] [Accepted: 04/23/2024] [Indexed: 05/16/2024]
Abstract
In this study, we synthesize nanostructured nickel oxide (NiO) and doped cobalt (Co) by combining nickel(II) chloride hexahydrate (NiCl2.6H2O) and sodium hydroxide (NaOH) as initial substances. We analyzed the characteristics of the product nanostructures, including their structure, optical properties, and magnetic properties, using various techniques such as x-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet absorption spectroscopy (UV-Vis), Fourier transform infrared (FTIR) spectroscopy, and vibrating sample magnetometers (VSM). The NiO nanoparticles doped with Co showed photocatalytic activity in degrading methylene blue (MB) dye in aqueous solutions. We calculated the degradation efficiencies by analyzing the UV-Vis absorption spectra at the dye's absorption wavelength of 664 nm. It was observed that the NiO-doped Co nanoparticles facilitated enhanced recombination and migration of active elements, which led to more effective degradation of organic dyes during photocatalysis. We also assessed the electrochemical properties of the materials using cyclic voltammetry (CV) and impedance spectroscopy in a 1 mol% NaOH solution. The NiO-modified electrode exhibited poor voltammogram performance due to insufficient contact between nanoparticles and the electrolyte solution. In contrast, the uncapped NiO's oxidation and reduction cyclic voltammograms displayed redox peaks at 0.36 and 0.30 V, respectively.
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Affiliation(s)
- Murugesan Venkatachalapathy
- PG & Research Department of Physics, Thiru. A. Govindasamy Government Arts College, Tindivanam, Tamil Nadu, India
| | - Kuppusamy Sambathkumar
- PG & Research Department of Physics, Arignar Anna Government Arts College, Villupuram, Tamil Nadu, India
| | | | - Ramamurthy Uthrakumar
- Department of Physics, Government Arts College (Autonomous), Salem, Tamil Nadu, India
| | - Kasinathan Kaviyarasu
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
| | - Manesh Ashok Yewale
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, Republic of Korea
| | - Mohammed Awad
- School of Engineering, Samarkand International University of Technology (SIUT), Samarkand, Uzbekistan
- Department of Chemical Engineering, Toronto Metropolitan University, Toronto, Ontario, Canada
| | - Mir Waqas Alam
- Department of Physics, College of Science, King Faisal University, Al-Ahsa, Saudi Arabia
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Gorokhovsky A, Morozova N, Yurkov G, Grapenko O, Kozinkin A, Kozakov A, Nikolskiy A, Tretyachenko E, Semenov A, Solodilov V. Catalytic Decomposition of H 2O 2 in the Aqueous Dispersions of the Potassium Polytitanates Produced in Different Conditions of Molten Salt Synthesis. Molecules 2023; 28:4945. [PMID: 37446607 DOI: 10.3390/molecules28134945] [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: 05/30/2023] [Revised: 06/19/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
It is shown that the potassium polytitanate powder (PPT) synthesized at 500 °C via the treatment of powdered TiO2 (rutile) in molten mixtures of KOH and KNO3 is a cheap and effective catalyst of H2O2 chemical decomposition in aqueous solutions. At the same time, the PPT catalytic activity strongly depends on the [TiO2]:[KOH]:[KNO3] weight ratio in the mixture used for the synthesis, increasing with [KNO3] in the order of PPT (30:30:40) < PPT (30:50:20) < PPT (30:70:0). The obtained results are explained by increased [Ti3+] in the PPT structure (XPS data), which is grown in this order from 0 to 4.0 and 21.9 at.%, respectively, due to the reduced oxidation activity of the melt used for PPT synthesis. The mechanism of the autocatalytic process taking place in the PPT-H2O2-H2O system is analyzed. Taking into account the data of FT-IR spectroscopy, it is assumed that the increased catalytic activity of the investigated materials is related to the increased surface concentration of the Ti4+-O(H)-Ti4+ groups, formed from the Ti3+-O(H3O+)-Ti4+ clusters and further transformed into Ti-O-O-H catalytic centers. Some possible applications of the PPT-H2O2-H2O catalytic system, including the oxidation processes of green chemistry and photo-catalysis, are discussed.
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Affiliation(s)
- Alexander Gorokhovsky
- Department of Materials Chemistry and Technology, Yuri Gagarin State Technical University of Saratov, Polytekhnicheskaya 77, Saratov 410054, Russia
| | - Natalia Morozova
- Department of Materials Chemistry and Technology, Yuri Gagarin State Technical University of Saratov, Polytekhnicheskaya 77, Saratov 410054, Russia
| | - Gleb Yurkov
- N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow 119991, Russia
| | - Olga Grapenko
- Research Institute of Physics, Southern Federal University, pr. Stachki 194, Rostov-on-Don 344090, Russia
| | - Alexander Kozinkin
- Research Institute of Physics, Southern Federal University, pr. Stachki 194, Rostov-on-Don 344090, Russia
| | - Alexei Kozakov
- Research Institute of Physics, Southern Federal University, pr. Stachki 194, Rostov-on-Don 344090, Russia
| | - Anatoliy Nikolskiy
- Research Institute of Physics, Southern Federal University, pr. Stachki 194, Rostov-on-Don 344090, Russia
| | - Elena Tretyachenko
- Department of Materials Chemistry and Technology, Yuri Gagarin State Technical University of Saratov, Polytekhnicheskaya 77, Saratov 410054, Russia
| | - Andrey Semenov
- N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow 119991, Russia
| | - Vitaliy Solodilov
- N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow 119991, Russia
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Ke Y, Wang Z, Xie H, Khalifa MA, Zheng J, Xu C. Long-Term Stable Complementary Electrochromic Device Based on WO 3 Working Electrode and NiO-Pt Counter Electrode. MEMBRANES 2023; 13:601. [PMID: 37367805 DOI: 10.3390/membranes13060601] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/28/2023]
Abstract
Complementary electrochromic devices (ECDs) composed of WO3 and NiO electrodes have wide applications in smart windows. However, they have poor cycling stability due to ion-trapping and charge mismatch between electrodes, which limits their practical application. In this work, we introduce a partially covered counter electrode (CE) composed of NiO and Pt to achieve good stability and overcome the charge mismatch based on our structure of electrochromic electrode/Redox/catalytic counter electrode (ECM/Redox/CCE). The device is assembled using a NiO-Pt counter electrode with WO3 as the working electrode, and PC/LiClO4 containing a tetramethylthiourea/tetramethylformaminium disulfide (TMTU/TMFDS2+) redox couple as the electrolyte. The partially covered NiO-Pt CE-based ECD exhibits excellent EC performance, including a large optical modulation of 68.2% at 603 nm, rapid switching times of 5.3 s (coloring) and 12.8 s (bleaching), and a high coloration efficiency of 89.6 cm2·C-1. In addition, the ECD achieves a good stability of 10,000 cycles, which is promising for practical application. These findings suggest that the structure of ECC/Redox/CCE could overcome the charge mismatch problem. Moreover, Pt could enhance the Redox couple's electrochemical activity for achieving high stability. This research provides a promising approach for the design of long-term stable complementary electrochromic devices.
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Affiliation(s)
- Yajie Ke
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Zitao Wang
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Haiyi Xie
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Mahmoud A Khalifa
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, The Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- Physics Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - Jianming Zheng
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Chunye Xu
- Hefei National Research Center for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
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Martínez-Aguilar V, Peña-Juárez MG, Carrillo-Sanchez PC, López-Zamora L, Delgado-Alvarado E, Gutierrez-Castañeda EJ, Flores-Martínez NL, Herrera-May AL, Gonzalez-Calderon JA. Evaluation of the Antioxidant and Antimicrobial Potential of SiO 2 Modified with Cinnamon Essential Oil ( Cinnamomum Verum) for Its Use as a Nanofiller in Active Packaging PLA Films. Antioxidants (Basel) 2023; 12:antiox12051090. [PMID: 37237956 DOI: 10.3390/antiox12051090] [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: 02/21/2023] [Revised: 04/05/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023] Open
Abstract
One of the main causes of food spoilage is the lipid oxidation of its components, which generates the loss of nutrients and color, together with the invasion of pathogenic microorganisms. In order to minimize these effects, active packaging has played an important role in preservation in recent years. Therefore, in the present study, an active packaging film was developed using polylactic acid (PLA) and silicon dioxide (SiO2) nanoparticles (NPs) (0.1% w/w) chemically modified with cinnamon essential oil (CEO). For the modification of the NPs, two methods (M1 and M2) were tested, and their effects on the chemical, mechanical, and physical properties of the polymer matrix were evaluated. The results showed that CEO conferred to SiO2 NPs had a high percentage of 2,2-diphenyl-l-picrylhydrazyl (DPPH) free radical inhibition (>70%), cell viability (>80%), and strong inhibition to E. coli, at 45 and 11 µg/mL for M1 and M2, respectively, and thermal stability. Films were prepared with these NPs, and characterizations and evaluations on apple storage were performed for 21 days. The results show that the films with pristine SiO2 improved tensile strength (28.06 MPa), as well as Young's modulus (0.368 MPa) since PLA films only presented values of 27.06 MPa and 0.324 MPa, respectively; however, films with modified NPs decreased tensile strength values (26.22 and 25.13 MPa), but increased elongation at break (from 5.05% to 10.32-8.32%). The water solubility decreased from 15% to 6-8% for the films with NPs, as well as the contact angle, from 90.21° to 73° for the M2 film. The water vapor permeability increased for the M2 film, presenting a value of 9.50 × 10-8 g Pa-1 h-1 m-2. FTIR analysis indicated that the addition of NPs with and without CEO did not modify the molecular structure of pure PLA; however, DSC analysis indicated that the crystallinity of the films was improved. The packaging prepared with M1 (without Tween 80) showed good results at the end of storage: lower values in color difference (5.59), organic acid degradation (0.042), weight loss (24.24%), and pH (4.02), making CEO-SiO2 a good component to produce active packaging.
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Affiliation(s)
- Verónica Martínez-Aguilar
- Doctorado Institucional en Ingeniería y Ciencia de Materiales, Universidad Autónoma de San Luis Potosí, Sierra Leona No. 550 Col. Lomas 2da. Sección, San Luis Potosí 78210, Mexico
| | - Mariana G Peña-Juárez
- Doctorado Institucional en Ingeniería y Ciencia de Materiales, Universidad Autónoma de San Luis Potosí, Sierra Leona No. 550 Col. Lomas 2da. Sección, San Luis Potosí 78210, Mexico
| | - Perla C Carrillo-Sanchez
- Maestría en Ingeniería y Tecnología de Materiales, Universidad de La Salle Bajío, Av. Universidad 602, Lomas del Campestre, León 37150, Mexico
| | - Leticia López-Zamora
- División de Estudios de Posgrado e Investigación, Tecnológico Nacional de Méxicoen Orizaba, Oriente 9 No. 852 Emiliano Zapata, Orizaba 94320, Mexico
| | - Enrique Delgado-Alvarado
- Micro and Nanotechnology Research Center, Universidad Veracruzana, Blvd. Av. Ruiz Cortines No. 455 Fracc. Costa Verde, Boca del Río 94294, Mexico
- Facultad de Ciencias Quimicas, Universidad Veracruzana, Blvd. Av. Ruiz Cortines No. 455 Fracc. Costa Verde, Boca del Río 94294, Mexico
| | - Emmanuel J Gutierrez-Castañeda
- Cátedras CONACYT-Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550 Lomas 2da Sección, San Luis Potosí 78210, Mexico
| | - Norma L Flores-Martínez
- Ingeniería Agroindustrial, Universidad Politécnica de Guanajuato, Avenida Universidad Sur #1001 Comunidad Juan Alonso, Cortazar 38496, Mexico
| | - Agustín L Herrera-May
- Micro and Nanotechnology Research Center, Universidad Veracruzana, Blvd. Av. Ruiz Cortines No. 455 Fracc. Costa Verde, Boca del Río 94294, Mexico
- Maestría en Ingeniería Aplicada, Facultad de Ingeniería de la Construcción y el Hábitat, Universidad Veracruzana, Boca del Río 94294, Mexico
| | - Jose Amir Gonzalez-Calderon
- Cátedras CONACYT-Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava #64, Zona Universitaria, San Luis Potosí 78290, Mexico
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