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Ranu R, Kadam SL, Gade VK, Desarada SV, Yewale MA, Chavan KB. Comparative microstructural analysis of V 2O 5nanoparticles via x-ray diffraction (XRD) technique. NANOTECHNOLOGY 2024; 35:435701. [PMID: 39059416 DOI: 10.1088/1361-6528/ad67e7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 07/26/2024] [Indexed: 07/28/2024]
Abstract
Vanadium pentoxide (V2O5) nanoparticles exhibit diverse properties and have been studied for a wide range of applications, including energy storage, catalysis, environmental remediation, and material enhancement. In this work, we have reported the synthesis of vanadium pentaoxide (V2O5) nanoparticles using hydrothermal method. Ammonium metavanadate (NH4VO3) was used as a source of vanadium. These syntheses were carried out at four different concentrations of vanadium source. The hydrothermal reaction was conducted at a temperature of 180 °C for a duration of 24 hours, followed by an additional 24 hours period of natural cooling. Four samples were annealed in air using a muffle furnace at 500 °C for five hours. The x-ray diffraction technique was used to study the structural aspects. A comparative analysis of the microstructure was conducted utilizing the Scherrer method, the Williamson-Hall method and its various models, size-strain analysis, and the Halder-Wagner method. The crystallite size and microstrain were determined using these distinct methods, revealing a systematic correlation between the crystallite size and microstrain obtained through the different techniques.
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Affiliation(s)
- Rupin Ranu
- Department of Physics, New Arts, Commerce and Science College, Ahmednagar, Maharashtra, India
| | - S L Kadam
- Department of Physics, New Arts, Commerce and Science College, Parner, Ahmednagar, Maharashtra, India
| | - V K Gade
- Department of Physics, Shri Anand College, Pathardi, Maharashtra, India
| | - Sachin V Desarada
- School of Computing, University of South Africa, 28 Pioneer Ave, Florida Park, Johannesburg 1709, South Africa
| | - M A Yewale
- School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Kalyan B Chavan
- Department of Physics, Ahmednagar College, Ahmednagar, Maharashtra, India
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2
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Yan B, Di W, Sun Z, Han Y, Meng H, Zhang X. Rational Design of MIL-68(In) Derived Multiple Sulfides with Well Confined Quantum Dots and the Promoted Photocatalytic Hydrogen Generation. Inorg Chem 2024; 63:12190-12199. [PMID: 38946342 DOI: 10.1021/acs.inorgchem.4c01450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
Quantum dots (QDs) of metal sulfides were proven to be excellent cocatalysts in visible-light-driven photocatalytic reactions. Metal organic frameworks (MOFs) possess a 3D porous channel that effectively confines small QDs and preserves their high catalytic activity by preventing their aggregation. In order to precisely construct the ternary metal sulfides of ZnS/ZnIn2S4/In2S3 with well-maintained Zn-AgInS2 (ZAIS) QDs, an in situ sulfurization combining a subsequent Zn(II)-exchange strategy was employed in this work. First, the ZAIS QDs were incorporated into MIL-68(In), which were then used as the precursors to precisely construct the ternary metal sulfides of ZnS/ZnIn2S4/In2S3 with well maintained ZAIS QDs through an in situ sulfurization combining subsequent Zn(II)-exchange strategy. When the optimized nanocomposites (QDs@M-t-Zn, where t is the sulfurization time) were applied in visible light-induced photocatalytic hydrogen generation, the resulting QDs@M-24h-Zn showed a significantly improved hydrogen evolution rate of 448.96 μmol g-1 h-1, which values are clearly higher than those of MIL-68(In), QDs@MIL-68(In), and M-24h-Zn without the presence of ZAIS QDs. To elucidate the increased photocatalytic mechanism, the optical patterns and the batch electrochemical investigations were combined. It has been discovered that the matching band potentials and the close contact heterojunction enhance interface charge transfer, which in turn encourages photocatalytic hydrogen production. This study demonstrates the well-thought-out design of the uniform confinement architecture inherited from MOF QD-assisted multinary metal sulfides photocatalysts.
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Affiliation(s)
- Boyi Yan
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Wenkang Di
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Zhongqiao Sun
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Yide Han
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Hao Meng
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Xia Zhang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
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Gama Cavalcante AL, Dari DN, Izaias da Silva Aires F, Carlos de Castro E, Moreira Dos Santos K, Sousa Dos Santos JC. Advancements in enzyme immobilization on magnetic nanomaterials: toward sustainable industrial applications. RSC Adv 2024; 14:17946-17988. [PMID: 38841394 PMCID: PMC11151160 DOI: 10.1039/d4ra02939a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2024] [Accepted: 05/27/2024] [Indexed: 06/07/2024] Open
Abstract
Enzymes are widely used in biofuels, food, and pharmaceuticals. The immobilization of enzymes on solid supports, particularly magnetic nanomaterials, enhances their stability and catalytic activity. Magnetic nanomaterials are chosen for their versatility, large surface area, and superparamagnetic properties, which allow for easy separation and reuse in industrial processes. Researchers focus on the synthesis of appropriate nanomaterials tailored for specific purposes. Immobilization protocols are predefined and adapted to both enzymes and support requirements for optimal efficiency. This review provides a detailed exploration of the application of magnetic nanomaterials in enzyme immobilization protocols. It covers methods, challenges, advantages, and future perspectives, starting with general aspects of magnetic nanomaterials, their synthesis, and applications as matrices for solid enzyme stabilization. The discussion then delves into existing enzymatic immobilization methods on magnetic nanomaterials, highlighting advantages, challenges, and potential applications. Further sections explore the industrial use of various enzymes immobilized on these materials, the development of enzyme-based bioreactors, and prospects for these biocatalysts. In summary, this review provides a concise comparison of the use of magnetic nanomaterials for enzyme stabilization, highlighting potential industrial applications and contributing to manufacturing optimization.
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Affiliation(s)
- Antônio Luthierre Gama Cavalcante
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará Campus Pici Fortaleza CEP 60455760 CE Brazil
| | - Dayana Nascimento Dari
- Instituto de Engenharias e Desenvolvimento Sustentável, Universidade da Integração Internacional da Lusofonia Afro-Brasileira Campus das Auroras Redenção CEP 62790970 CE Brazil
| | - Francisco Izaias da Silva Aires
- Instituto de Engenharias e Desenvolvimento Sustentável, Universidade da Integração Internacional da Lusofonia Afro-Brasileira Campus das Auroras Redenção CEP 62790970 CE Brazil
| | - Erico Carlos de Castro
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará Campus Pici Fortaleza CEP 60455760 CE Brazil
| | - Kaiany Moreira Dos Santos
- Instituto de Engenharias e Desenvolvimento Sustentável, Universidade da Integração Internacional da Lusofonia Afro-Brasileira Campus das Auroras Redenção CEP 62790970 CE Brazil
| | - José Cleiton Sousa Dos Santos
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará Campus Pici Fortaleza CEP 60455760 CE Brazil
- Instituto de Engenharias e Desenvolvimento Sustentável, Universidade da Integração Internacional da Lusofonia Afro-Brasileira Campus das Auroras Redenção CEP 62790970 CE Brazil
- Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará Campus do Pici, Bloco 940 Fortaleza CEP 60455760 CE Brazil
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Khalid A, Ali S, Rukhma, Jahangeer M, Sarwar A, Nelofer R, Aziz T, Alharbi M, Alasmari AF, Albekairi TH. Immobilization of Aspergillus oryzae tyrosine hydroxylase on ZnO nanocrystals for improved stability and catalytic efficiency towards L-dopa production. Sci Rep 2023; 13:22882. [PMID: 38129644 PMCID: PMC10739923 DOI: 10.1038/s41598-023-50198-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/16/2023] [Indexed: 12/23/2023] Open
Abstract
The current study focuses on the submerged fermentation of tyrosine hydroxylase (TH) from Aspergillus oryzae IIB-9 and its immobilization on zinc oxide nanocrystals (ZnO-NPs) for increased L-dopa production. The volume of Vogel's medium (75 ml), period of incubation (72 h), initial pH (5.5), and size of inoculum (1.5 ml) were optimal for maximum TH activity. The watch glass-dried (WG) and filter paper-dried (FP) ZnO-NPs were prepared and characterized using analytical techniques. The UV-Vis spectra revealed 295 and 285 nm absorption peaks for WG-ZnO-NPs and FP-ZnO-NPs dispersed in isopropanol. X-ray diffraction analysis confirmed the crystalline nature of ZnO-NPs. FTIR spectra band from 740 to 648.1/cm and 735.8/cm to 650.1/cm showed the stretching vibrations of WG-ZnO-NPs and FP-ZnO-NPs, respectively. The particle size of ZnO-NPs observed by scanning electron microscopy (SEM) images was between 130 and 170 nm. Furthermore, the stability of immobilized TH on ZnO-NPs was determined by varying the incubation period (10 min for WG-NPs and 15 min for FP-NPs) and temperature (45 °C and 30 °C for WG and FP-NPs, respectively). Incubating enzymes with various copper, iron, manganese, and zinc salts studied the catalytic efficiency of TH. Immobilization of TH on ZnO-NPs resulted in an 11.05-fold increase in TH activity, thus enhancing stability and catalytic efficiency.
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Affiliation(s)
- Ansa Khalid
- Institute of Industrial Biotechnology, Government College University, Lahore, Pakistan
| | - Sikander Ali
- Institute of Industrial Biotechnology, Government College University, Lahore, Pakistan.
| | - Rukhma
- Institute of Industrial Biotechnology, Government College University, Lahore, Pakistan
- Food and Biotechnology Research Center, PCSIR Laboratories Complex Ferozpur Road, Lahore, Pakistan
| | - Muhammad Jahangeer
- Food and Biotechnology Research Center, PCSIR Laboratories Complex Ferozpur Road, Lahore, Pakistan
| | - Abid Sarwar
- Food and Biotechnology Research Center, PCSIR Laboratories Complex Ferozpur Road, Lahore, Pakistan
| | - Rubina Nelofer
- Food and Biotechnology Research Center, PCSIR Laboratories Complex Ferozpur Road, Lahore, Pakistan
| | - Tariq Aziz
- Laboratory of Animal Health, Food Hygiene, and Quality, Department of Agriculture, University of Ioannina, 471 32, Arta, Greece.
| | - Metab Alharbi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, 11451, Riyadh, Saudi Arabia
| | - Abdullah F Alasmari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, 11451, Riyadh, Saudi Arabia
| | - Thamer H Albekairi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, 11451, Riyadh, Saudi Arabia
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Jeevanandam J, Gonçalves M, Castro R, Gallo J, Bañobre-López M, Rodrigues J. Enhanced alpha-amylase inhibition activity of amine-terminated PAMAM dendrimer stabilized pure copper-doped magnesium oxide nanoparticles. BIOMATERIALS ADVANCES 2023; 153:213535. [PMID: 37385162 DOI: 10.1016/j.bioadv.2023.213535] [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: 01/02/2023] [Revised: 06/16/2023] [Accepted: 06/19/2023] [Indexed: 07/01/2023]
Abstract
The present work aims to prepare copper-doped MgO nanoparticles via a sol-gel approach and study their antidiabetic alpha-amylase inhibition activity with undoped MgO nanoparticles. The ability of G5 amine-terminated polyamidoamine (PAMAM) dendrimer for the controlled release of copper-doped MgO nanoparticles to exhibit alpha-amylase inhibition activity was also evaluated. The synthesis of MgO nanoparticles via sol-gel approach and optimization of calcination temperature and time has led to the formation of nanoparticles with different shapes (spherical, hexagonal, and rod-shaped) and a polydispersity in size ranging from 10 to 100 nm with periclase crystalline phase. The presence of copper ions in the MgO nanoparticles has altered their crystallite size, eventually modifying their size, morphology, and surface charge. The efficiency of dendrimer to stabilize spherical copper-doped MgO nanoparticles (ca. 30 %) is higher than in other samples, which was confirmed by UV-Visible, DLS, FTIR, and TEM analysis. The amylase inhibition assay emphasized that the dendrimer nanoparticles stabilization has led to the prolonged enzyme inhibition ability of MgO and copper-doped MgO nanoparticles for up to 24 h.
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Affiliation(s)
- Jaison Jeevanandam
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - Mara Gonçalves
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - Rita Castro
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - Juan Gallo
- Advanced (magnetic) theranostic nanostructures lab (AmTheNa), Nanomedicine group, International Iberian Nanotechnology Laboratory (INL), Braga 4715-330, Portugal
| | - Manuel Bañobre-López
- Advanced (magnetic) theranostic nanostructures lab (AmTheNa), Nanomedicine group, International Iberian Nanotechnology Laboratory (INL), Braga 4715-330, Portugal
| | - João Rodrigues
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal; School of Materials Science and Engineering, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi'an 710072, China.
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Tahir H, Rashid F, Ali S, Summer M, Abaidullah R. Spectrophotometrically, Spectroscopically, Microscopically and Thermogravimetrically Optimized TiO 2 and ZnO Nanoparticles and their Bactericidal, Antioxidant and Cytotoxic Potential: A Novel Comparative Approach. J Fluoresc 2023:10.1007/s10895-023-03367-0. [PMID: 37672182 DOI: 10.1007/s10895-023-03367-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 07/24/2023] [Indexed: 09/07/2023]
Abstract
Current study was aimed to determine the antibacterial, antioxidant and cytotoxic potential of Titanium dioxide nanoparticles (TiO2NPs) and Zinc oxide nanoparticles (ZnONPs). Nanoparticles were characterized by UV-Vis spectrophotometry, particle size analyzer (PSA), fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The Minimum inhibitory concentration (MIC) was determined by standard agar dilution method. Antibacterial potential of nanoparticles was analyzed by standard disc diffusion method against bacterial strains including Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumonia. Different concentrations of NPs (0.2, 0.4, 0.6, 0.8, 1.0, 1.2 and 1.4 mg/mL) were incorporated to evaluate the antimicrobial activity. Antioxidant activity and cytotoxicity of these NPs was analyzed by DPPH method and brine shrimp cytotoxicity assay, respectively. The MIC of TiO2NPs against E. coli, P. aeruginosa and K. pneumoniae was 0.04, 0.08 and 0.07 mg/mL respectively while the MIC of ZnONPs against the above strains was 0.01, 0.015 and 0.01 mg/mL. The maximum zone of inhibition was observed for K. pneumoniae i.e., 20mm and 25mm against TiO2 and ZnO NPs respectively, at 1.4 mg/mL concentration of NPs. The susceptibility of NPs against bacterial strains was evaluated in the following order: K. pneumoniae > P. aeruginosa > E. coli. The antioxidant activity of nanoparticles increased by increasing the concentration of NPs while cytotoxic analysis exhibited non-toxic effect of ZnO NPs while TiO2 had toxic effects on 1.2 and 1.4 mg/mL concentrations. Results revealed that ZnO NPs have more antibacterial and negligible cytotoxic potential in contrast to TiO2 NPs.
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Affiliation(s)
- Hunaiza Tahir
- Department of Zoology, Lahore College for Women University, Lahore, Pakistan
| | - Farzana Rashid
- Department of Zoology, Lahore College for Women University, Lahore, Pakistan
| | - Shaukat Ali
- Department of Zoology, Government College University Lahore, Lahore, Pakistan.
| | - Muhammad Summer
- Department of Zoology, Government College University Lahore, Lahore, Pakistan
| | - Rimsha Abaidullah
- Department of Zoology, Government College University Lahore, Lahore, Pakistan
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Hosseini-Sarvari M, Dehghani A. Nickel/TiO2-catalyzed Suzuki–Miyaura cross-coupling of arylboronic acids with aryl halides in MeOH/H2O. MONATSHEFTE FUR CHEMIE 2023. [DOI: 10.1007/s00706-023-03052-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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8
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Iqbal M, Ibrar A, Ali A, Hussain S, Shad S, Ullah S, Alshahrani T, Hakami J, Khan F, Thebo KH. Facile Synthesis of Mn doped Bi2S3 Photocatalyst for Efficient Degradation of Organic Dye under Visible-Light Irradiation. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Synthesis and Application of Innovative and Environmentally Friendly Photocatalysts: A Review. Catalysts 2022. [DOI: 10.3390/catal12101074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Modern society faces two major challenges: removing pollutants from water and producing energy from renewable sources. To do this, science proposes innovative, low-cost, and environmentally friendly methods. The heterogeneous photocatalysis process fits perfectly in this scenario. In fact, with photocatalysis, it is possible both to mineralize contaminants that are not easily biodegradable and to produce hydrogen from the water splitting reaction or from the conversion of organic substances present in water. However, the main challenge in the field of heterogeneous photocatalysis is to produce low-cost and efficient photocatalysts active under visible light or sunlight. The objective of this review is to compare the new proposals for the synthesis of innovative photocatalysts that reflect the requirements of green chemistry, applied both in the removal of organic contaminants and in hydrogen production. From this comparison, we want to bring out the strengths and weaknesses of the proposals in the literature, but above all, new ideas to improve the efficiency of heterogeneous photocatalysis guaranteeing the principles of environmental and economic sustainability.
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Kodithuwakku P, Jayasundara D, Munaweera I, Jayasinghe R, Thoradeniya T, Weerasekera M, Ajayan PM, Kottegoda N. A Review on Recent Developments in Structural Modification of TiO2 For Food Packaging Applications. PROG SOLID STATE CH 2022. [DOI: 10.1016/j.progsolidstchem.2022.100369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Chauhan N, Singh V, Kumar S, Vohra A. Hydrothermal Synthesis of Nitrogen and Iron-Doped ZnO/MWCNTs Nanocomposites for Enhanced Photocatalytic Performance. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-021-06280-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Akbar MU, Ikram M, Imran M, Haider A, Ul-Hamid A, Dilpazir S, Shahzadi I, Nazir G, Shahzadi A, Nabgan W, Haider J. Cu-loaded C3N4-MgO nanorods for promising antibacterial and dye degradation. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02494-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Nkwe VM, Onwudiwe DC, Azeez MA. Solvothermal synthesis of pure and Sn-doped Bi 2S 3 and the evaluation of their photocatalytic activity on the degradation of methylene blue. BMC Chem 2021; 15:65. [PMID: 34922612 PMCID: PMC8684666 DOI: 10.1186/s13065-021-00792-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Accepted: 12/06/2021] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND A large volume of dye molecules finds its way into the environment, accumulates in water bodies, and makes the aquatic system unsafe to human health. Due to the complex nature of these dye materials, most of the conventional techniques are not effective for their removal. Semiconductor photocatalysis has emerged as a promising technique for the destruction of organic pollutants under UV or visible light irradiation. Among the semiconductors, Bi2S3 is widely employed in photocatalysis due to its non-toxicity and chemical stability. However, one of its problems is the high recombination rate of the charge, and various methods have been employed to enhance the photo-reactivity. One of these methods is the incorporation of transition elements. RESULTS Herein, a facile solvothermal method was used to prepare Bi2S3 nanorods and needle- shaped Sn doped Bi2S3, using bismuth(III) tris(N-phenyldithiocarbamate) as a single-source precursor. The prepared nanomaterials were characterized, and used as efficient photocatalyst for the photo enhanced degradation of methylene blue (MB) dye under visible light irradiation. The nanomaterials exhibited very good photocatalytic activity towards the photo degradation of MB, showing a degradation rate of up to 83% and 94% within 150 min for the pristine and Sn doped Bi2S3, respectively. CONCLUSION The enhancement in the photocatalytic activity of the Sn doped Bi2S3 was attributed to the suppression in the recombination rate of the electron-hole pairs, due to the formation of new energy level below the CB, that was capable of altering the equilibrium concentration of the carrier. This confirmed that Sn doped Bi2S3 could be utilized as valuable cost-efficient catalysts for eliminating methyl blue from aqueous solutions and also possible candidates in environmental pollution treatment.
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Affiliation(s)
- Violet M Nkwe
- Material Science Innovation and Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Sciences, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho, 2735, South Africa
- Department of Chemistry, Faculty of Natural and Agricultural Sciences, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho, 2735, South Africa
| | - Damian C Onwudiwe
- Material Science Innovation and Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Sciences, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho, 2735, South Africa.
- Department of Chemistry, Faculty of Natural and Agricultural Sciences, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho, 2735, South Africa.
| | - Mayowa A Azeez
- Department of Industrial Chemistry, Ekiti State University, P.M.B 5363, Ado Ekiti, Ekiti State, Nigeria
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Dobrucka R, Szymanski M, Przekop R. Phytotoxic effects of biosynthesized ZnO nanoparticles using Betonica officinalis extract. ENVIRONMENTAL TECHNOLOGY 2021; 42:3747-3755. [PMID: 32149570 DOI: 10.1080/09593330.2020.1740331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 03/02/2020] [Indexed: 06/10/2023]
Abstract
The unique properties of nanoparticles create broad opportunities as regards their application in almost all disciplines of science and technology. There are many reports about the negative influence of nanoproducts on the environment and humans. Therefore, it is of vital importance to explore the impact of metal nanoparticles on plants. This is why this work is concerned with the phytotoxic activity of ZnO nanoparticles synthesized biologically from Betonica officinalis extract against the seed of Lepidium sativum, Linum flavum, Zea mays and Salvia hispanica-Chia. The obtained ZnO nanoparticles were characterized by UV-Vis, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM) and Atomic Force Microscopy (AFM). Those methods made it possible to assess the structure and size of the obtained ZnO nanoparticles, which was 5 nm. The obtained ZnO nanoparticles exhibited significant toxic properties throughout the range of the tested concentrations. ZnO nanoparticles were the most toxic to Lepidium sativum, for which the IC50 value was 0.0000112 [mg/ml]. The solution of Zn(NO3)2 was toxic as well, as it inhibited the growth of the tested sample throughout the range of the tested concentrations.
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Affiliation(s)
- Renata Dobrucka
- Department of Non-Food Products Quality and Packaging Development, Institute of Quality Science, Poznań University of Economics and Business, Poznań, Poland
| | - Marcin Szymanski
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Poznan, Poland
| | - Robert Przekop
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Poznan, Poland
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Chauhan N, Singh V, Kumar S, Kumari M. Preparation, Characterization and Evaluations of Carbon-Doped Ag/Fe/TiO₂ Mesoporous Nanocomposite Photocatalyst for Degradation of Methylene Blue and Congo Red. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2021; 21:5344-5351. [PMID: 33875128 DOI: 10.1166/jnn.2021.19331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Carbon doped silver/iron/TiO₂ nanocomposite is synthesized via the solvothermal technique. Titanium tetraisopropoxide is used as a TiO₂ source. The composite samples are characterized by different physicochemical methods, including nitrogen adsorption-desorption analysis, transmission electron microscope, scanning electron microscope, X-ray diffraction, photoluminescence, UV-vis, Fourier-transform infrared, and Energy dispersive X-ray spectroscopy. The nanocrystalline structure of the samples with anatase phase having a tetragonal shape is shown by the XRD and TEM analysis. The photo-absorption boundary of pure TiO₂ expands into the visible light region due to composite formation, shown by analysis of UV-vis data. An increase in the degree of electron-hole couple segregation is shown via photoluminescence analysis. N₂ adsorption-desorption analysis manifests the higher surface area of samples along with mesoporous nature. The high photodegradation action is shown by the composite samples as compared to pure mesoporous TiO₂.
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Affiliation(s)
- Nikhil Chauhan
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
| | - Virender Singh
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
| | - Suresh Kumar
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
| | - Monika Kumari
- Department of Electronic Science, Kurukshetra University, Kurukshetra 136119, India
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Ashfaq A, Ikram M, Haider A, Ul-Hamid A, Shahzadi I, Haider J. Nitrogen and Carbon Nitride-Doped TiO 2 for Multiple Catalysis and Its Antimicrobial Activity. NANOSCALE RESEARCH LETTERS 2021; 16:119. [PMID: 34312737 PMCID: PMC8313641 DOI: 10.1186/s11671-021-03573-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 07/13/2021] [Indexed: 05/21/2023]
Abstract
Nitrogen (N) and carbon nitride (C3N4)-doped TiO2 nanostructures were prepared using co-precipitation route. Fixed amount of N and various concentrations (0.1, 0.2, 0.3 wt%) of C3N4 were doped in TiO2 lattice. Through multiple techniques, structural, chemical, optical and morphological properties of samples were thoroughly investigated. XRD results verified anatase TiO2 presence along the substitutional doping of N, while higher degree of crystallinity as well as increased crystallite size were noticed after doping. HR-TEM study revealed formation of nanostructures incorporated on two dimensional (2D) C3N4 nanosheet surface. Elemental composition was checked out using EDS technique which confirmed the presence of dopant in product. Optical characteristics were evaluated with UV-vis spectroscopy which depicted representative redshift in absorption spectra resulted in a reduction in bandgap energy in N/C3N4-doped TiO2 samples. The formation of Ti-O-Ti bonds and different molecular vibrations were disclosed by FTIR. Trap sites and charge carrier's migration in the materials were evaluated with PL spectroscopy. Multiple catalytic activities (photo, sono and photo-sono) were undertaken to evaluate the dye degradation performance of prepared specimen against methylene blue and ciprofloxacin. Further, antimicrobial activity was analyzed against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria.
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Affiliation(s)
- Atif Ashfaq
- Solar Cell Application Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab, 54000, Pakistan
| | - Muhammad Ikram
- Solar Cell Application Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab, 54000, Pakistan.
| | - Ali Haider
- Department of Clinical Medicine and Surgery, University of Veterinary and Animal Sciences, Lahore, Punjab, 54000, Pakistan
| | - Anwar Ul-Hamid
- Core Research Facilities, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.
| | - Iram Shahzadi
- Punjab University College of Pharmacy, University of the Punjab, Lahore, 54000, Pakistan
| | - Junaid Haider
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
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Influence of post-heat treatment on photocatalytic activity in metal-embedded TiO2 nanofibers. KOREAN J CHEM ENG 2021. [DOI: 10.1007/s11814-021-0800-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Ibrayev NK, Seliverstova EV, Sadykova AE, Serikov TM. Synthesis, Structure, and Physical Properties of a Nanocomposite Based on Graphene Oxide and TiO2. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2021. [DOI: 10.1134/s0036024421040105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Al-Jawad SMH, Ismail MM, Ghazi SF. Characteristics of diluted magnetic semiconductor based on Mn-doped TiO2 nanorod array films. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-020-04823-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Rashidi P, Ghamari M, Ghasemifard M. The structural and optical band gap energy evaluation of nano TiO2 powders by diffuse reflectance spectroscopy prepared via combustion method. INTERNATIONAL NANO LETTERS 2020. [DOI: 10.1007/s40089-020-00313-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Unwiset P, Chanapattharapol KC, Kidkhunthod P, Poo-arporn Y, Ohtani B. Catalytic activities of titania-supported nickel for carbon-dioxide methanation. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2020.115955] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Aqeel M, Ikram M, Imran M, Ul-Hamid A, Qumar U, Shahbaz A, Ikram M, Saeed A. TiO 2 Co-doped with Zr and Ag shows highly efficient visible light photocatalytic behavior suitable for treatment of polluted water. RSC Adv 2020; 10:42235-42248. [PMID: 35516777 PMCID: PMC9057920 DOI: 10.1039/d0ra08718a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 11/10/2020] [Indexed: 11/28/2022] Open
Abstract
The objective of this study is to analyze the effects of zirconium (Zr) and silver (Ag) doping on the photoactivity of titania (TiO2). Zr-Ag (ZA) co-doped TiO2 products were fabricated via sol-gel technique and their properties (structural and chemical) were characterized. The weight ratio of TiO2 was fixed, while weight ratios of Zr and Ag were varied from 2 to 4, 6 and 8 wt% while synthesized samples were calcined at 400 °C for 3 h. The XRD results demonstrated that the incorporation of metal doping agents failed to alter the host material's lattice structure, however, its crystallite size was reduced from 13.54 to 5.05 nm with increasing Zr4+ and Ag+ concentrations. FTIR spectroscopy was used to examine various functional groups. In the attained spectra, an ample absorption peak between 500 and 1000 cm-1 was recorded, which was ascribed to Ti-O-Ti linkage vibration mode present within TiO2. Surface morphology, microstructure, SAED patterns and elemental composition were examined with FE-SEM, HR-TEM and EDX, which served to confirm the ZA-doped TiO2 product. Band gap energy of the co-doped material was significantly reduced as indicated by a higher wavelength redshift in the spectra. The photoactivity and kinetics of photo-products were investigated by observing photo-decolorization of methylene blue (MB) under a radiation source. Photodecomposition of MB was dramatically enhanced when titania co-doped with Zr and Ag was employed compared to un-doped or mono-doped TiO2. The ZA (8 wt%) co-doped TiO2 photocatalyst depicted the maximum MB removal efficiency (∼93%) within 90 min under a light source.
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Affiliation(s)
- M Aqeel
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore Punjab 54000 Paksitan
| | - M Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore Punjab 54000 Paksitan
| | - M Imran
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology Beijing 100029 China
| | - A Ul-Hamid
- Center for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals Dhahran 31261 Saudi Arabia
| | - U Qumar
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University 14 Ali Road Lahore Pakistan
| | - A Shahbaz
- Department of Physics, Government College University Lahore Punjab 54000 Pakistan
| | - M Ikram
- Institute of Chemical Engineering and Technology (ICET), University of the Punjab Lahore 54000 Pakistan
| | - A Saeed
- Department of Chemistry, Quaid-i-Azam University Islamabad 45320 Pakistan
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Nematollahi R, Ghotbi C, Khorasheh F, Larimi A. Ni-Bi co-doped TiO2 as highly visible light response nano-photocatalyst for CO2 photo-reduction in a batch photo-reactor. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2020.101289] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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24
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Kumar P, Singh V, Kumar S, Chauhan N, Saharan BS. Solvothermal synthesis of C doped Co-Cu/TiO 2 based nanocomposite to study their photocatalytic activity. NANO EXPRESS 2020. [DOI: 10.1088/2632-959x/aba683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
The solvothermal approach is applied to produce doped titanium dioxide nanoparticles in the mesoporous form using Pluronic F127 as a delicate mold. The formulated samples are investigated successfully via x-ray diffraction, ultraviolet-visible spectroscopy, photoluminescence spectroscopy, scanning electron microscope, energy dispersive x-ray, transmission electron microscope, nitrogen adsorption-desorption analysis, and Fourier-transform infrared spectroscopy. Analysis of XRD, SEM, and TEM demonstrates the existence of a nanocrystalline size range of the particles. Methylene blue, congo red, and malachite green dyes are used to evaluate the photocatalytic competence of the samples. The results verified that the TiO2 including a peak quantity of copper (4%) shows maximum photocatalysis caused by the declined bandgap energy including effective charge separation of photoinduced charge carrier with a maximum surface area as revealed by ultraviolet-visible, photoluminescence spectroscopy & nitrogen adsorption-desorption analysis respectively.
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Asghar M, Habib S, Zaman W, Hussain S, Ali H, Saqib S. Synthesis and characterization of microbial mediated cadmium oxide nanoparticles. Microsc Res Tech 2020; 83:1574-1584. [PMID: 32757348 DOI: 10.1002/jemt.23553] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 07/03/2020] [Accepted: 07/04/2020] [Indexed: 12/24/2022]
Abstract
Microbial mediated synthesis of metallic nanoparticles constitutes as effective and promising approach for the development of antibacterial materials in the field of bioengineering and biomedicine. We prepared Cadmium oxide nanoaprticles (CdO NPs) utilizing Penicillium oxalicum, and cadmium acetate solution via coprecipitate method. The elemental composition and morphology of these synthesized CdO NPs were examined through X-ray diffraction (XRD), UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and Energy dispersive spectroscopy (EDS). Furthermore, we evaluated the bactericidal potential of prepared CdO NPs using Escherichia coli (E.coli), Staphylococcus aureus (S.aureus), Bacillus cereus (B.cereus), and Pseudomonas aeruginosa (P. aeruginosa). Dimethyl sulfoxide was used as negative control while erythromycin was used as positive control. The XRD spectrum revealed cubic crystalline nanoparticles with 22.94 nm size and UV showed absorbance peak at 297 nm with 2.5 eV band gap energy. FTIR depicted O─H and carboxylic groups along with CdO stretching vibration. EDS showed the presence of organic compounds on Cd and O over NPs surface. SEM results revealed the spherical shape of the CdO NPs. The synthesized NPs exhibited highly potent bactericidal activity against selected strains and demonstrated less optical density of 0.086 after 24 hr. Owing to the significant antibacterial activity of CdO NPs, the broad application prospects of these nanoparticles CdO NPs in extensive biomedical applications is indicated.
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Affiliation(s)
- Mehrina Asghar
- Department of Biotechnology, Mohi-ud-Din Islamic University, Nerian Sharif, Pakistan
| | - Sadaf Habib
- School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China.,Shenzhen Key Laboratory of Southern Subtropical Plant Diversity, Fairy Lake Botanical Garden, Shenzhen & Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Wajid Zaman
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Sajjad Hussain
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
| | - Huma Ali
- Department of Microbilogy, Quaid-i-Azam University, Islamabad, Pakistan
| | - Saddam Saqib
- Department of Biotechnology, Mohi-ud-Din Islamic University, Nerian Sharif, Pakistan.,State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
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26
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Ni-Doped Titanium Dioxide Films Obtained by Plasma Electrolytic Oxidation in Refrigerated Electrolytes. SURFACES 2020. [DOI: 10.3390/surfaces3020013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Porous crystalline Ni-doped TiO2 films were produced using DC plasma electrolytic oxidation in refrigerated H2SO4 aqueous solutions containing NiSO4. The crystalline phase structure consisted of a mixture of anatase and rutile, ranging from ~30 to ~80 wt % rutile. The oxide films obtained at low NiSO4 concentration showed the highest photocurrent values under monochromatic irradiation in the UV-vis range, outperforming pure TiO2. By increasing NiSO4 concentration above a threshold value, the photoelectrochemical activity of the films decreased below that of undoped TiO2. Similar results were obtained using cyclic voltammetry upon polychromatic UV-vis irradiation. Glow discharge optical emission spectrometry (GD-OES) analysis evidenced a sulfur signal peaking at the TiO2/Ti interface. XPS spectra revealed that oxidized Ni2+, S4+ and S6+ ions were included in the oxide films. In agreement with photocurrent measurements, photoluminescence (PL) spectra confirmed that less intense PL emission, i.e., a lower electron-hole recombination rate, was observed for Ni-doped samples, though overdoping was detrimental.
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27
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Liao C, Li Y, Tjong SC. Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E124. [PMID: 31936581 PMCID: PMC7022691 DOI: 10.3390/nano10010124] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 12/16/2022]
Abstract
This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.
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Affiliation(s)
- Chengzhu Liao
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuchao Li
- Department of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China;
| | - Sie Chin Tjong
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China
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28
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Jangam K, Patil K, Balgude S, Patange S, More P. Magnetically separable Zn1−xCo0.5xMg0.5xFe2O4 ferrites: stable and efficient sunlight-driven photocatalyst for environmental remediation. RSC Adv 2020; 10:42766-42776. [PMID: 35514887 PMCID: PMC9058123 DOI: 10.1039/d0ra08172h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 11/06/2020] [Indexed: 01/30/2023] Open
Abstract
Nanomaterials have recently gained significant interest as they are believed to offer an outstanding prospect for use in environmental remediation. Among many possible candidates, due to their useful properties including magnetic nature, wide surface area, and high absorptivity, ferrite materials hold tremendous appeal, allowing them to be used for multifaceted applications. In the present study, using a sol–gel auto combustion process, a magnetically separable Zn1−xCo0.5xMg0.5xFe2O4 (x = 0.0, 0.25, 0.50, 0.75, 1.0) ferrite with superior photocatalytic activity for dye degradation was manufactured. Rietveld refinement and FTIR studies confirm that a single-phase cubic spinel system was built for all samples with crystallite sizes of 34–57 nm. VSM has determined the magnetic properties of the samples at room temperature. With the introduction of Mg2+ and Co2+ in the Zn ferrites, a transformation from the soft superparamagnetic activity to the hard ferromagnetic character was reported. Considering the band structure in the visible region, the photocatalytic activities of the Zn1−xCo0.5xMg0.5xFe2O4 ferrites for the degradation of the MB dye under natural sunlight were investigated. Zn0.25Co0.375Mg0.375Fe2O4 showed an efficiency of degradation of 99.23% for MB dye with a quick 40 min irradiation period with high reusability of up to four cycles. Nanomaterials have recently gained significant interest as they are believed to offer an outstanding prospect for use in environmental remediation.![]()
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Affiliation(s)
- Kundan Jangam
- Department of Chemistry
- K. E. T's, V. G. Vaze College
- India
| | - Kundan Patil
- Department of Chemistry
- K. E. T's, V. G. Vaze College
- India
| | | | - Sunil Patange
- Department of Physics
- Shrikrishna Mahavidyalaya Gunjoti
- India
| | - Paresh More
- Department of Chemistry
- K. E. T's, V. G. Vaze College
- India
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29
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Ahmad MA, Yuesuo Y, Ao Q, Adeel M, Hui ZY, Javed R. Appraisal of Comparative Therapeutic Potential of Undoped and Nitrogen-Doped Titanium Dioxide Nanoparticles. Molecules 2019; 24:E3916. [PMID: 31671678 PMCID: PMC6864622 DOI: 10.3390/molecules24213916] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 10/24/2019] [Accepted: 10/27/2019] [Indexed: 12/12/2022] Open
Abstract
Nitrogen-doped and undoped titanium dioxide nanoparticles were successfully fabricated by simple chemical method and characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray (EDX), and transmission electron microscopy (TEM) techniques. The reduction in crystalline size of TiO2 nanoparticles (from 20-25 nm to 10-15 nm) was observed by TEM after doping with N. Antibacterial, antifungal, antioxidant, antidiabetic, protein kinase inhibition and cytotoxic properties were assessed in vitro to compare the therapeutic potential of both kinds of TiO2 nanoparticles. All biological activities depicted significant enhancement as a result of addition of N as doping agent to TiO2 nanoparticles. Klebsiella pneumoniae has been illuminated to be the most susceptible bacterial strain out of various Gram-positive and Gram-negative isolates of bacteria used in this study. Good fungicidal activity has been revealed against Aspergillus flavus. 38.2% of antidiabetic activity and 80% of cytotoxicity has been elucidated by N-doped TiO2 nanoparticles towards alpha-amylase enzyme and Artemia salina (brine shrimps), respectively. Moreover, notable protein kinase inhibition against Streptomyces and antioxidant effect including reducing power and % inhibition of DPPH has been demonstrated. This investigation unveils the more effective nature of N-doped TiO2 nanoparticles in comparison to undoped TiO2 nanoparticles indicated by various biological tests. Hence, N-doped TiO2 nanoparticles have more potential to be employed in biomedicine for the cure of numerous infections.
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Affiliation(s)
- Muhammad Arslan Ahmad
- Department of Tissue Engineering, China Medical University, Shenyang 110122, China.
- Key Lab of Eco-restoration of Regional Contaminated Environment, Shenyang University, Ministry of Education, Shenyang 11044, China.
| | - Yang Yuesuo
- Key Lab of Eco-restoration of Regional Contaminated Environment, Shenyang University, Ministry of Education, Shenyang 11044, China.
| | - Qiang Ao
- Department of Tissue Engineering, China Medical University, Shenyang 110122, China.
| | - Muhammad Adeel
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
| | - Zhang Yan Hui
- Department of Tissue Engineering, China Medical University, Shenyang 110122, China.
| | - Rabia Javed
- Department of Tissue Engineering, China Medical University, Shenyang 110122, China.
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30
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Shaban M, Ahmed AM, Shehata N, Betiha MA, Rabie AM. Ni-doped and Ni/Cr co-doped TiO 2 nanotubes for enhancement of photocatalytic degradation of methylene blue. J Colloid Interface Sci 2019; 555:31-41. [PMID: 31377646 DOI: 10.1016/j.jcis.2019.07.070] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/20/2019] [Accepted: 07/24/2019] [Indexed: 12/07/2022]
Abstract
Ni-doped and Ni/Cr co-doped TiO2 nanotubes were successfully synthesized using a novel hydrothermal method. The surface and bulk properties of as-synthesized nanopowders were characterized using various microstructural and optical techniques. The photocatalytic ability of these nanopowders was investigated systematically for the decomposition of methylene blue dye (MB) under visible light illumination. The morphological results revealed the structural transformation of TiO2 nanotubes to nanosheets, and further to a mixture of nanosheet/nanotube on doping with Ni and co-doping of Ni/Cr, respectively. Moreover, the Ni doping causes an optical absorption edge shifts towards lower wavelengths, while doping by Ni/Cr results to an optical absorption edge shifts towards higher wavelength in comparison to TiO2-nanotubes. Also, Ni-doping and Ni/Cr co-doping strongly affects the Raman vibrational modes owing to the changes in interplanar distance, crystallite size, dislocation density, and crystal microstrains. Among the undoped, doped and co-doped TiO2 nanoparticles, the 6Ni/4Cr co-doped TiO2 exhibited a higher efficiency of 95.6% and excellent stability towards the photocatalytic degradation of MB. It is attributed to the availability of many carriers for the efficient photo-oxidation within the UV-Vis optical absorption range. Also, the photocatalytic reaction kinetics and degradation mechanism of MB were discussed.
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Affiliation(s)
- Mohamed Shaban
- Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Ashour M Ahmed
- Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Nora Shehata
- Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Mohamed A Betiha
- Egyptian Petroleum Research Institute (EPRI), Cairo 11727, Egypt
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31
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Akshay VR, Arun B, Mandal G, Vasundhara M. Visible range optical absorption, Urbach energy estimation and paramagnetic response in Cr-doped TiO 2 nanocrystals derived by a sol-gel method. Phys Chem Chem Phys 2019; 21:12991-13004. [PMID: 31165820 DOI: 10.1039/c9cp01351b] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have carried out a detailed study of the morphological, structural, optical and magnetic properties of Cr doped TiO2 nanocrystals with doping concentrations varying from 3 to 12 atomic weight%. The results obtained from transmission electron microscopy analysis, size-strain plots of all the Cr-doped samples and crystallite size estimation reveal the particle size of the prepared nanocrystals to be well below 10 nm, which is observed to exhibit a decreasing trend with an increase in the Cr dopant concentration. All the samples crystallize in the anatase tetragonal phase of TiO2, which is confirmed from the Rietveld refinement of the X-ray diffraction patterns and the different modes present in the Raman spectra. The Eg(1) mode shows a clear red shift and broadening with increase in the Cr concentration, which indicates the replacement of Ti ions with Cr ions in the TiO2 lattice. The possibility of the presence of different functional groups present is verified by Fourier transform infra-red spectroscopy. The presence of Cr3+ and Ti4+ is confirmed from the X-ray photoelectron spectroscopy (XPS) results suggesting the formation of oxygen vacancies to compensate for the charge neutrality. The XPS results validate the Cr3+ existence in the Cr:TiO2 system and corroborate with a slight peak shift towards lower diffraction angle and further confirm the substitutional doping in the present case. Enhanced visible range optical absorption and a clear red shift associated with the absorption edge also suggest the incorporation of Cr3+ ions into the host system. The estimated band-gap of Cr-doped TiO2 nanocrystals reveals a decreasing trend with increasing Cr concentration. The Urbach energy associated with all the Cr-doped samples signifies the presence of oxygen vacancy related defects in the present system, which is further verified using photoluminescence (PL) spectra, and the deconvolution of the PL spectra provides an insight into the oxygen vacancy defects associated with the system. Paramagnetic (PM) behaviour is observed with an increase in the PM moment, suggesting the increase in isolated Cr ions with increase in the Cr concentration, which is further explained using a bound magnetic polaron (BMP) model. Isolated BMP formation could be the reason for the observed PM behavior of the present system, where the trapping of 3d electrons associated with Cr3+ in the vacancy sites could ultimately lead to fewer overlapped BMPs, yielding a net PM moment. The present Cr:TiO2 system could be modified with tailored optical and magnetic properties for functional applications such as magneto-optics and optoelectronic devices.
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Affiliation(s)
- V R Akshay
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum-695 019, India.
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32
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Chauhan N, Singh V, Kumar S, Kumari M, Sirohi K. Synthesis of nitrogen & palladium co-doped mesoporous titanium dioxide nanoparticles via evaporation induced self assembly method and study of their photocatalytic properties. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.02.055] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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33
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Akshay VR, Arun B, Mandal G, Vasundhara M. Structural, optical and magnetic behavior of sol–gel derived Ni-doped dilute magnetic semiconductor TiO2 nanocrystals for advanced functional applications. Phys Chem Chem Phys 2019; 21:2519-2532. [DOI: 10.1039/c8cp06875e] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Defect engineering of Ni-doped TiO2 could tailor the magnetic properties through BMP interactions, which is advantageous for spintronics applications.
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Affiliation(s)
- V. R. Akshay
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum – 695 019
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - B. Arun
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum – 695 019
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Guruprasad Mandal
- Centre for Rural and Cryogenic Technologies
- Jadavpur University
- Kolkata-700032
- India
| | - M. Vasundhara
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum – 695 019
- India
- Academy of Scientific and Innovative Research (AcSIR)
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Structural, Magnetic, and Catalytic Properties of Mn-Doped Titania Nanoparticles Synthesized by a Sol–Gel Process. J CLUST SCI 2018. [DOI: 10.1007/s10876-018-1437-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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