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Karthikeyan C, Jayaramudu T, Nuñez D, Jara N, Opazo-Capurro A, Varaprasad K, Kim K, Yallapu MM, Sadiku R. Hybrid nanomaterial composed of chitosan, curcumin, ZnO and TiO 2 for antibacterial therapies. Int J Biol Macromol 2023; 242:124814. [PMID: 37201889 DOI: 10.1016/j.ijbiomac.2023.124814] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 05/04/2023] [Accepted: 05/07/2023] [Indexed: 05/20/2023]
Abstract
Metal nanoparticles have been tremendously utilised, such as; antibacterial and anticancer agents. Although metal nanoparticles exhibits antibacterial and anticancer activity, but the drawback of toxicity on normal cells limits their clinical applications. Therefore, improving the bioactivity of hybrid nanomaterials (HNMs) and minimizing toxicity is of paramount importance for biomedical applications. Herein, a facile and simple double precipitation method was used to develop biocompatible and multifunctional HNM from antimicrobial chitosan, curcumin, ZnO and TiO2. In HNM, biomolecules chitosan and curcumin were used to control the toxicity of ZnO and TiO2 and improve their biocidal properties. The cytotxicological properties of the HNM was studied against human breast cancer (MDA-MB-231) and fibroblast (L929) cell lines. The antimicrobial activity of the HNM was examined against Escherichia coli and Staphylococcus aureus bacteria, via the well-diffusion method. In addition, the antioxidant property was evaluated by the radical scavenging method. These findings actively, support the ZTCC HNMs potential, as an innovative biocidal agent for applications in the clinical and healthcare sectors.
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Affiliation(s)
| | | | - Dariela Nuñez
- Departamento de Química Ambiental, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Nery Jara
- Departamento de Farmacología, Facultad de Ciencias Biológicas, Universidad de Concepción, Chile
| | - Andres Opazo-Capurro
- Laboratorio de Investigación en Agentes Antibacterianos (LIAA-UdeC), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción 4030000, Chile
| | - Kokkarachedu Varaprasad
- Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Sede Concepción, Concepción, Bio-Bio, Chile.
| | - Kyobum Kim
- Department of Chemical and Biochemical Engineering, Dongguk University, Seoul 04620, Republic of Korea
| | - Murali M Yallapu
- Immunology & Microbiology Department, Medicine School, UTRGV, McAllen, TX, USA; South Texas Center of Excellence in Cancer Research, School of Medicine, UTRGV, McAllen, TX, USA
| | - Rotimi Sadiku
- Institute of Nano Engineering Research (INER) & Department of Chemical, Metallurgical & Materials Engineering, Tshwane University of Technology, Pretoria West Campus, Staatsarillerie Rd, Pretoria 1083, South Africa
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Two-dimensional g-C3N4 nanosheets-based photo-catalysts for typical sustainable processes. CHINESE CHEM LETT 2023. [DOI: 10.1016/j.cclet.2023.108306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Park SI, Jung SM, Kim JY, Yang J. Effects of Mono- and Bifunctional Surface Ligands of Cu-In-Se Quantum Dots on Photoelectrochemical Hydrogen Production. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6010. [PMID: 36079393 PMCID: PMC9457290 DOI: 10.3390/ma15176010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/20/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Semiconductor nanocrystal quantum dots (QDs) are promising materials for solar energy conversion because of their bandgap tunability, high absorption coefficient, and improved hot-carrier generation. CuInSe2 (CISe)-based QDs have attracted attention because of their low toxicity and wide light-absorption range, spanning visible to near-infrared light. In this work, we study the effects of the surface ligands of colloidal CISe QDs on the photoelectrochemical characteristics of QD-photoanodes. Colloidal CISe QDs with mono- and bifunctional surface ligands are prepared and used in the fabrication of type-II heterojunction photoanodes by adsorbing QDs on mesoporous TiO2. QDs with monofunctional ligands are directly attached on TiO2 through partial ligand detachment, which is beneficial for electron transfer between QDs and TiO2. In contrast, bifunctional ligands bridge QDs and TiO2, increasing the amount of QD adsorption. Finally, photoanodes fabricated with oleylamine-passivated QDs show a current density of ~8.2 mA/cm2, while those fabricated with mercaptopropionic-acid-passivated QDs demonstrate a current density of ~6.7 mA/cm2 (at 0.6 VRHE under one sun illumination). Our study provides important information for the preparation of QD photoelectrodes for efficient photoelectrochemical hydrogen generation.
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Affiliation(s)
- Soo Ik Park
- Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
| | - Sung-Mok Jung
- Department of Chemical Engineering, Dankook University, Yongin 16890, Korea
| | - Jae-Yup Kim
- Department of Chemical Engineering, Dankook University, Yongin 16890, Korea
| | - Jiwoong Yang
- Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
- Energy Science and Engineering Research Center, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
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Si/SiO2/Al2O3 Supported Growth of CNT Forest for the Production of La/ZnO/CNT Photocatalyst for Hydrogen Production. MATERIALS 2022; 15:ma15093226. [PMID: 35591559 PMCID: PMC9100653 DOI: 10.3390/ma15093226] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/22/2022] [Accepted: 04/27/2022] [Indexed: 11/17/2022]
Abstract
The use of ZnO as a photocatalyst with a reduced recombination rate of charge carriers and maximum visible light harvesting remains a challenge for researchers. Herein, we designed and synthesized a unique La/ZnO/CNTs heterojunction system via a sol–gel method to evaluate its photocatalytic performance for hydrogen evolution. A ferrocene powder catalyst was tested for the production of CNT forests over Si/SiO2/Al2O3 substrate. A chemical vapor deposition (CVD) route was followed for the forest growth of CNTs. The La/ZnO/CNTs composite showed improved photocatalytic efficiency towards hydrogen evolution (184.8 mmol/h) in contrast to 10.2 mmol/h of pristine ZnO. The characterization results show that promoted photocatalytic activity over La/ZnO/NTs is attributed to the spatial separation of the charge carriers and extended optical absorption towards the visible light spectrum. The optimum photocatalyst shows a 16 h cycle performance for hydrogen evolution. The H2 evolution rate under visible light illumination reached 10.2 mmol/h, 145.9 mmol/h and 184.8 mmol/h over ZnO, La/ZnO and La/ZnO/CNTs, respectively. Among the prepared photocatalysts, ZnO showed the lowest H2 evolution rate due to the fast recombination of electron–hole pairs than heterojunction photocatalysts. This research paves the way for the development of ZnO and CNT-based photocatalysts with a wide optical response and reduced charge carrier recombinations.
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Roy D, Yadav AK. Green TiO2–ZnO nanocomposite stimulator for the growth of Solanum lycopersicum in aquaculture. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02329-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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