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Rathore C, Yadav VK, Gacem A, AbdelRahim SK, Verma RK, Chundawat RS, Gnanamoorthy G, Yadav KK, Choudhary N, Sahoo DK, Patel A. Microbial synthesis of titanium dioxide nanoparticles and their importance in wastewater treatment and antimicrobial activities: a review. Front Microbiol 2023; 14:1270245. [PMID: 37908543 PMCID: PMC10613736 DOI: 10.3389/fmicb.2023.1270245] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 09/20/2023] [Indexed: 11/02/2023] Open
Abstract
Nanotechnology (NT) and nanoparticles (NPs) have left a huge impact on every field of science today, but they have shown tremendous importance in the fields of cosmetics and environmental cleanup. NPs with photocatalytic effects have shown positive responses in wastewater treatment, cosmetics, and the biomedical field. The chemically synthesized TiO2 nanoparticles (TiO2 NPs) utilize hazardous chemicals to obtain the desired-shaped TiO2. So, microbial-based synthesis of TiO2 NPs has gained popularity due to its eco-friendly nature, biocompatibility, etc. Being NPs, TiO2 NPs have a high surface area-to-volume ratio in addition to their photocatalytic degradation nature. In the present review, the authors have emphasized the microbial (algae, bacterial, fungi, and virus-mediated) synthesis of TiO2 NPs. Furthermore, authors have exhibited the importance of TiO2 NPs in the food sector, automobile, aerospace, medical, and environmental cleanup.
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Affiliation(s)
- Chandani Rathore
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Laxmangarh, Rajasthan, India
| | - Virendra Kumar Yadav
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
| | - Amel Gacem
- Department of Physics, Faculty of Sciences, University 20 Août 1955, Skikda, Algeria
| | - Siham K. AbdelRahim
- Department of Chemistry, College of Science, King Khalid University, Abha, Saudi Arabia
| | - Rakesh Kumar Verma
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Laxmangarh, Rajasthan, India
| | - Rajendra Singh Chundawat
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Laxmangarh, Rajasthan, India
| | - G. Gnanamoorthy
- Department of Inorganic Chemistry, University of Madras, Chennai, Tamilnadu, India
| | - Krishna Kumar Yadav
- Faculty of Science and Technology, Madhyanchal Professional University, Ratibad, Bhopal, India
- Environmental and Atmospheric Sciences Research Group, Scientific Research Center, Al-Ayen University, Nasiriyah, Iraq
| | - Nisha Choudhary
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
| | - Dipak Kumar Sahoo
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Ashish Patel
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
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Wang L, Pang Y, Zheng Q, Ruan J, Fang L, Liu C. Development of mabuterol transdermal patch: Molecular mechanism study of ion-pair improving patch stability. Int J Pharm 2023; 644:123302. [PMID: 37572858 DOI: 10.1016/j.ijpharm.2023.123302] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 07/28/2023] [Accepted: 08/09/2023] [Indexed: 08/14/2023]
Abstract
This paper aimed to prepare a Mabuterol (MAB) patch for treating asthma by ion-pair strategy to overcome the drug's thermal instability and elucidate the molecular mechanisms of the stabilization effect. The formulation factor, including counter-ion and pressure-sensitive adhesive (PSA), was optimized by the stability and in vitro skin permeation studies. The molecular mechanism of ion-pair stability was characterized using TGA, Raman, FT-IR, NMR, XPS, and molecular modeling. The optimized patch comprised MAB-Lactic acid (MAB-LA) and hydroxyl adhesive (AAOH) as the matrix, with Q = 126.47 ± 9.75 μg/cm2 and Fabs = 75.27%. The increased TGA (213.11 °C), disproportionation energy (ΔG = 97.44 KJ), and ion-pair lifetime (Tlife = 2.21 × 103) indicated that the counter-ion improved MAB stability through strong ionic and hydrogen bonds with LA. The remaining drug content in the MAB-LA patch was 15% higher than that of the pure MAB patch after storage for 12 months at room temperature, which was visualized by Raman imaging. The interaction between MAB-LA and AAOH PSA via hydrogen bond decreased the diffusion rate and increased the drug stability further. This study successfully developed the MAB patch, which provided a reference for applying ion-pairing strategies to improve the stability of transdermal patches.
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Affiliation(s)
- Liuyang Wang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
| | - Yu Pang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
| | - Qi Zheng
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
| | - Jiuheng Ruan
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
| | - Liang Fang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
| | - Chao Liu
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
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Moushumy ZM, Hassan MJ, Ahsan M, Hasan MM, Uddin MN, Nagao Y, Hasnat MA. Photocatalytic degradation of chlorazol yellow dye under sunlight irradiation using Ce, Bi, and N co-doped TiO 2 photocatalyst in neutral medium. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:35153-35169. [PMID: 36527547 DOI: 10.1007/s11356-022-24220-0] [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: 07/15/2022] [Accepted: 11/10/2022] [Indexed: 06/17/2023]
Abstract
Chlorazol yellow (CY) is a commonly used anionic, toxic, mutagenic, and potentially carcinogenic azo dye, which is menacing to the environment, aquatic system, food chain, and human health as well. To remove CY dye molecules from an aqueous medium, a series of Ce, Bi, and N co-doped TiO2 photocatalysts were prepared by varying the composition of the dopants. Under sunlight irradiation, the resultant 5 wt% (Ce-Bi-N) co-doped TiO2 composite catalyst was found to show the best catalytic activity. Hence, the required characterization of this catalyst was performed systematically using energy-dispersive X-ray spectroscopy (EDX), scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) techniques. From the thorough investigation, it is revealed that the CY molecules reached adsorption-desorption equilibrium onto the surface of the catalyst within 30 min following second-order kinetics. Herein, the catalyst attained 97% degradation when exposed to sunlight at neutral (pH ~ 7, [CY] = 5 mg L-1) medium. The developed catalyst can destruct CY molecules with a maximum rate of 23.1 µg CY g-1 min-1 and the photodegradation kinetics follows first-order kinetics below 23.5 mg L-1, a fractional order between 23.5 and 35.0 mg L-1, and a zeroth order above 35.0 mg L-1 of CY concentration. Finding from scavenging effect implies that [Formula: see text] and [Formula: see text] radicals have significant influence on the degradation. A suitable mechanism has been proposed with excellent stability and verified reusability of the proposed photocatalyst.
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Affiliation(s)
- Zannatul Mumtarin Moushumy
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
| | - Mohammad Jobaer Hassan
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
| | - Mohebul Ahsan
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
| | - Md Mahmudul Hasan
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1292, Japan
| | - Md Nizam Uddin
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh
| | - Yuki Nagao
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1292, Japan
| | - Mohammad A Hasnat
- Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh.
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Alexpandi R, Abirami G, Murugesan B, Durgadevi R, Swasthikka RP, Cai Y, Ragupathi T, Ravi AV. Tocopherol-assisted magnetic Ag-Fe 3O 4-TiO 2 nanocomposite for photocatalytic bacterial-inactivation with elucidation of mechanism and its hazardous level assessment with zebrafish model. JOURNAL OF HAZARDOUS MATERIALS 2023; 442:130044. [PMID: 36179621 DOI: 10.1016/j.jhazmat.2022.130044] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 09/18/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
In recent years, many endeavours have been prompted with photocatalytic nanomaterials by the need to eradicate pathogenic microorganisms from water bodies. Herein, a tocopherol-assisted Ag-Fe3O4-TiO2 nanocomposite (TAFTN) was synthesized for photocatalytic bacterial inactivation. The prepared TAFTN became active under sunlight due to its narrowed bandgap, inactivating the bacterial contaminants via photo-induced ROS stress. The ROS radicals destroy bacteria by creating oxidative stress, which damages the cell membrane and cellular components such as nucleic acids and proteins. For the first time, the nano-LC-MS/MS-based quantitative proteomics reveals that the disrupted proteins are involved in a variety of cellular functions; the most of these are involved in the metabolic pathway, eventually leading to bacterial death during TAFTN-photocatalysis under sunlight. Furthermore, the toxicity analysis confirmed that the inactivated bacteria seemed to have no detrimental impact on zebrafish model, showing that the disinfected water via TAFTN-photocatalysis is enormously safe. Furthermore, the TAFTN-photocatalysis successfully killed the bacterial cells in natural seawater, indicating the consistent photocatalytic efficacy when recycled repeatedly. The results of this work demonstrate that the produced nanocomposite might be a powerful recyclable and sunlight-active photocatalyst for environmental water treatment.
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Affiliation(s)
- Rajaiah Alexpandi
- Lab in Microbiology and Marine Biotechnology, Department of Biotechnology, School of Biological Sciences, Alagappa University, Karaikudi 630 003, India
| | - Gurusamy Abirami
- Lab in Microbiology and Marine Biotechnology, Department of Biotechnology, School of Biological Sciences, Alagappa University, Karaikudi 630 003, India
| | - Balaji Murugesan
- The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, National Engineering Lab for Textile Fiber Materials and Processing Technology, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, PR China; Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | - Ravindran Durgadevi
- Lab in Microbiology and Marine Biotechnology, Department of Biotechnology, School of Biological Sciences, Alagappa University, Karaikudi 630 003, India
| | - Roshni Prithiviraj Swasthikka
- Lab in Microbiology and Marine Biotechnology, Department of Biotechnology, School of Biological Sciences, Alagappa University, Karaikudi 630 003, India
| | - Yurong Cai
- The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, National Engineering Lab for Textile Fiber Materials and Processing Technology, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| | - Thennarasu Ragupathi
- Lab in Microbiology and Marine Biotechnology, Department of Biotechnology, School of Biological Sciences, Alagappa University, Karaikudi 630 003, India
| | - Arumugam Veera Ravi
- Lab in Microbiology and Marine Biotechnology, Department of Biotechnology, School of Biological Sciences, Alagappa University, Karaikudi 630 003, India.
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Trabelsi K, Abidi M, Hajjaji A, Tefdini R, Bessais B, Rtimi S. Photoelectrochemical properties and reactivity of supported titanium NTs for bacterial inactivation and organic pollutant removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:10733-10744. [PMID: 36083373 DOI: 10.1007/s11356-022-22923-y] [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: 04/12/2022] [Accepted: 09/03/2022] [Indexed: 06/15/2023]
Abstract
In this work, we report on the effect of anodization time on the morphology, optical, and photocatalytic properties of TiO2 nanotubes (NTs) allowing bacterial inactivation and two organic pollutant degradation under low-intensity solar-simulated light. Scanning electron microscopy (SEM) showed that the length of the TiO2 NTs increased from 2.8 to 25.8 μm as anodization time was increased from 15 to 300 min at 60 V, respectively. The X-ray diffraction (XRD) patterns showed that all samples crystallize in the anatase phase after annealing at 400 °C for 3 h. Samples anodized for 30 and 60 min exhibit low diffuse reflection at 400 nm, which was attributed to the disorder-induced exciton scattering at the molecular level. The intensity of the photoluminescence (PL) spectra was found to increase as the length of the NTs increases up to a maximum anodization time of 300 min, revealing the contribution of bulk excitonic states. A maximum photoelectric conversion efficiency of 0.55% was obtained at a potential of - 0.5 V vs. Ag/AgCl for TiO2 NTs anodized for 60 min. The optimized NTs (anodized for 60 min) showed a photocatalytic bacterial inactivation of a magnitude of 6 log within 360 min and a degradation of indole and methylene blue (MB) under low-intensity solar-simulated light (50 mW/cm2). The stability of the prepared catalyst was tested over several cycles.
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Affiliation(s)
- Khaled Trabelsi
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Mabrouk Abidi
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Anouar Hajjaji
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Rania Tefdini
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Brahim Bessais
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Sami Rtimi
- Laboratoire de Technologie des Poudres (LTP), Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-STI-IMX-LTP, Station 12, CH-1015, Lausanne, Switzerland.
- Global Institute for Water, Environment and Health, 1210, Geneva, Switzerland.
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Yao L, Zhang T, Peng S, Xu D, Liu Z, Li H, Hu L, Mo H. Fe2+ protects postharvest pitaya (Hylocereus undulatus britt) from Aspergillus. flavus infection by directly binding its genomic DNA. FOOD CHEMISTRY: MOLECULAR SCIENCES 2022; 5:100135. [PMID: 36177106 PMCID: PMC9513725 DOI: 10.1016/j.fochms.2022.100135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 08/30/2022] [Accepted: 09/17/2022] [Indexed: 12/02/2022]
Abstract
Light was shield on Fe2+ application as antifungal agent on pitaya postharvest. Fe2+ prevents A. flavus infection by directly binding to A. flavus DNA. This research will promote the research on the mechanism of fungal death. A new strategy was provided to combat fungal infection in fruit postharvest industry.
Aspergillus flavus (A. flavus) is a postharvest fungus, causing pitaya fruit decay and limiting pitaya value and shelf life. However, safer and more efficient methods for preventing A. flavus contamination for pitaya fruit remain to be investigated. In this study, we successfully proved exogenous Fe2+ could inhibit A. flavus colonization in pitaya fruit and extend pitaya’s shelf life after harvest. Moreover, gel electrophoresis, CD analysis and Raman spectrum tests revealed Fe2+ could more effectively and thoroughly promote conidial death by directly binding to A. flavus DNA. Increased expression of DNA damage repair-related genes after Fe2+ treatment was observed by transcription analysis, which might eventually lead to SOS response in A. flavus. These results indicated Fe2+ could prevent A. flavus infestation on pitaya in a novel, quickly responsive mechanism. Our results shed light on the potential application of Fe2+ in the food industry and provided a more universal antifungal agent against food pathogens.
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Haruna A, Chong FK, Ho YC, Merican ZMA. Preparation and modification methods of defective titanium dioxide-based nanoparticles for photocatalytic wastewater treatment-a comprehensive review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:70706-70745. [PMID: 36044146 DOI: 10.1007/s11356-022-22749-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
The rapid population growth and industrial expansion worldwide have created serious water contamination concerns. To curb the pollution issue, it has become imperative to use a versatile material for the treatment. Titanium dioxide (TiO2) has been recognized as the most-studied nanoparticle in various fields of science and engineering due to its availability, low cost, efficiency, and other fascinating properties with a wide range of applications in modern technology. Recent studies revealed the photocatalytic activity of the material for the treatment of industrial effluents to promote environmental sustainability. With the wide band gap energy of 3.2 eV, TiO2 can be activated under UV light; thus, many strategies have been proposed to extend its photoabsorption to the visible light region. In what follows, this has generated increasing attention to study its characteristics and structural modifications in different forms for photocatalytic applications. The present review provides an insight into the understanding of the synthesis methods of TiO2, the current progress in the treatment techniques for the degradation of wide environmental pollutants employing modified TiO2 nanoparticles, and the factors affecting its photocatalytic activities. Further, recent developments in using titania for practical applications, the approach for designing novel nanomaterials, and the prospects and opportunities in this exciting area have been discussed.
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Affiliation(s)
- Abdurrashid Haruna
- Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia.
- Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria.
- Centre of Innovative Nanostructures & Nanodevices (COINN), Institute of Autonomous System, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia.
| | - Fai-Kait Chong
- Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
- Centre of Innovative Nanostructures & Nanodevices (COINN), Institute of Autonomous System, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia
| | - Yeek-Chia Ho
- Civil and Environmental Engineering Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
- Centre for Urban Resource Sustainability, Institute for Self-Sustainable Building, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
| | - Zulkifli Merican Aljunid Merican
- Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
- Institute of Contaminant Management for Oil & Gas, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
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Vanlalhmingmawia C, Lalhriatpuia C, Tiwari D, Kim DJ. Noble metal-doped TiO 2 thin films in the efficient removal of Mordant Orange-1: insights of degradation process. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:51732-51743. [PMID: 35247174 DOI: 10.1007/s11356-021-17568-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 11/12/2021] [Indexed: 06/14/2023]
Abstract
Nanocomposite Ag0(NPs)/TiO2 is synthesised in a facile template method enabling nanoparticles of reduced Ag evenly distributed within the titania network. The morphological studies of nanocomposites were extensively performed employing SEM/EDX (scanning electron microscopy/energy dispersive X-ray), TEM (transmission electron microscopy) and AFM (atomic force microscopy). Moreover, the bandgap energies of materials were obtained using the diffuse reflectance spectrometer (DRS). The newer insights in the photocatalytic elimination of Mordant Orange-1 (MO1) was obtained using the nanocomposite thin film for various parametric studies utilising the UV-A and LED illuminations. The kinetics of degradation of MO1 was performed, and the rate constant was favoured at lower concentrations of MO1. Moreover, the elimination efficiency of MO1 was favoured with a decrease in solution pH. The NPOC results inferred that a fairly good extent of MO1 was mineralised using a thin-film catalyst for both the UV-A and LED illuminations. The minimal effect of several co-ions demonstrated the applicability of thin films in the elimination of MO1, and the stability of the thin film has shown the potential applicability of thin-film catalysts. Further, the mechanism of photocatalytic degradation was demonstrated with the radical scavenger studies and ascertained the reaction pathways.
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Affiliation(s)
| | - Chhakchhuak Lalhriatpuia
- Department of Chemistry, Pachhunga University College, Mizoram University, Aizawl, 796001, India
| | - Diwakar Tiwari
- Department of Chemistry, School of Physical Sciences, Mizoram University, Aizawl, 796004, India.
| | - Dong-Jin Kim
- Department of Environment Science and Biotechnology, Hallym University, Chuncheon, 24252, Republic of Korea
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Siddiqui T, Khan NJ, Asif N, Ahamad I, Yasin D, Fatma T. Screening, characterisation and bioactivities of green fabricated TiO 2 NP via cyanobacterial extract. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:39052-39066. [PMID: 35098455 DOI: 10.1007/s11356-021-17639-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 11/16/2021] [Indexed: 06/14/2023]
Abstract
The present study was aimed at exploring 37 strains of cyanobacteria for the biofabrication of TiO2 NP and evaluation of their antioxidant, antifungal, antibacterial and hemolytic activity. Screening of cyanobacterial strains was done via SEM, followed by optimisation and characterisation of the best strain. Synechocystis NCCU-370 appeared as the best strain for the synthesis of TiO2 NP in terms of size (73.39 nm) and time (24 h) after screening. Following optimisation, nanoparticles were synthesised in 12 h having an average grain size of 16 nm. The aqueous extract preparation required heating of 5 mg/ml of powdered biomass to 60 °C for 10 min. Optimum conditions for the synthesis of TiO2 NP were found to be pH 7, 30 °C and 12-h cell extract exposure to 0.1 mM of salt. Antioxidant activity was evaluated via DPPH, ABTS and FRAP assay. Antifungal potential was explored against Candida albicans (MIC = 125 µg/ml), Candida glabrata (MIC = 500 µg/ml) and Candida tropicalis (MIC = 250 µg/ml), whereas antibacterial potential was gauged for Bacillus cereus (MIC = 31.25 µg/ml), Escherichia coli (MIC = 31.25 µg/ml) and Klebsiella pneumoniae (MIC = 500 µg/ml) strains. Biogenic TiO2 NP demonstrated partial synergistic effect and excellent biocompatibility.
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Affiliation(s)
- Tabassum Siddiqui
- Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, 110025, India
| | - Nida Jamil Khan
- Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, 110025, India
| | - Nida Asif
- Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, 110025, India
| | - Irshad Ahamad
- Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, 110025, India
| | - Durdana Yasin
- Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, 110025, India
| | - Tasneem Fatma
- Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, 110025, India.
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Arora I, Chawla H, Chandra A, Sagadevan S, Garg S. Advances in the strategies for enhancing the photocatalytic activity of TiO2: conversion from UV-light active to visible-light active photocatalyst. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109700] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Zhou F, Yang M, Lu R, Yan C. Simultaneous adsorption-photocatalytic treatment with TiO 2-Sep nanocomposites for in situ remediation of sodium pentachlorophenol contaminated aqueous and soil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:39557-39566. [PMID: 35103948 DOI: 10.1007/s11356-022-18924-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
Sodium pentachlorophenol (NaPCP) is a highly toxic and persistent organic pollutant. With sepiolite as the support, a series of TiO2-Sep nanocomposites (NCs) with different Ti/Sep ratios were developed. The objective was to understand the effect of Ti/Sep ratio on the structure and activity of the NCs in aqueous and soil systems and to evaluate the feasibility of the NCs for in situ soil remediation. The prepared NCs were characterized with XRD, SEM, TEM, and N2 adsorption-desorption, respectively. The results showed that high surface area and good dispersion of TiO2 on sepiolite surface were obtained. The photocatalytic activities in aqueous and soil of the as-developed NCs were examined using NaPCP as a model pollutant. Compared with bare sepiolite and TiO2, the heterogeneous NCs showed significantly higher photocatalytic performance in decomposing NaPCP, and the photocatalytic activities varied with the content of TiO2 in the NCs. In aqueous media, treatment with TiO2-S-30 showed excellent degradation efficiency with about 90% NaPCP decomposed in 140 min. Nevertheless, the sample TiO2-S-20 promotes maximum rate reduction of NaPCP with above 90% within 20-h irradiation in soil. The results indicate that an appropriate Ti/Sep ratio could significantly enhance the activities of NCs on NaPCP remediation and the role of carrier sepiolite is more important in soil media than that in aqueous phase. The excellent performance of the TiO2-Sep in wastewater degradation and soil remediation can be attributed to the synergistic effects between the high photocatalytic activity of TiO2 nanoparticles and the strong adsorption capacity of sepiolite nanofibers. This work revealed that sepiolite adsorption coupled with TiO2 photocatalysis can be one promising technique for in situ remediation of NaPCP-contaminated soil.
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Affiliation(s)
- Feng Zhou
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Minghui Yang
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Ronghong Lu
- Li'Jiang LONGi Silicon Materials Corp, Lijiang, 674800, China
| | - Chunjie Yan
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China.
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N-Rich Doped Anatase TiO2 with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation. NANOMATERIALS 2022; 12:nano12091564. [PMID: 35564273 PMCID: PMC9105496 DOI: 10.3390/nano12091564] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/01/2022] [Accepted: 05/03/2022] [Indexed: 12/31/2022]
Abstract
Nitrogen (N) doping is an effective strategy for improving the solar-driven photocatalytic performance of anatase TiO2, but controllable methods for nitrogen-rich doping and associated defect engineering are highly desired. In this work, N-rich doped anatase TiO2 nanoparticles (4.2 at%) were successfully prepared via high-temperature nitridation based on thermally stable H3PO4-modified TiO2. Subsequently, the associated deep-energy-level defects such as oxygen vacancies and Ti3+ were successfully healed by smart photo-Fenton oxidation treatment. Under visible-light irradiation, the healed N-doped TiO2 exhibited a ~2-times higher activity of gas-phase acetaldehyde degradation than the non-treated one and even better than standard P25 TiO2 under UV-visible-light irradiation. The exceptional performance is attributed to the extended spectral response range from N-rich doping, the enhanced charge separation from hole capturing by N-doped species, and the healed defect levels with the proper thermodynamic ability for facilitating O2 reduction, depending on the results of ∙O2− radicals and defect measurement by electron spin resonance, X-ray photoelectron spectroscopy, atmosphere-controlled surface photovoltage spectra, etc. This work provides an easy and efficient strategy for the preparation of high-performance solar-driven TiO2 photocatalysts.
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13
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Prakruthi K, Ujwal MP, Yashas SR, Mahesh B, Kumara Swamy N, Shivaraju HP. Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:4930-4957. [PMID: 34797548 DOI: 10.1007/s11356-021-17361-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 10/31/2021] [Indexed: 06/13/2023]
Abstract
Many untreated and partly treated wastewater from the home and commercial resources is being discharged into the aquatic environment these days, which contains numerous unknown and complex natural and inorganic compounds. These compounds tend to persist, initiating severe environmental problems, which affect human health. Conventionally, physicochemical treatment methods were adopted to remove such complex organic chemicals, but they suffer from critical limitations. Over time, photocatalysis, an advanced oxidation process, has gained its position for its efficient and fair performance against emerging organic pollutant decontamination. Typically, photocatalysis is a green technology to decompose organics under UV/visible light at ambient conditions. Semiconducting nanometal oxides have emerged as pioneering photocatalysts because of large active surface sites, flexible oxidation states, various morphologies, and easy preparation. The current review presents an overview of emerging organic pollutants and their effects, advanced oxidation processes, photocatalytic mechanism, types of photocatalysts, photocatalyst support materials, and methods for improving photodegradation efficiency on the degradation of complex emerging organic pollutants. In addition, the recent reports of metal-oxide-driven photocatalytic remediation of emerging organic pollutants are presented in brief. This review is anticipated to reach a broader scientific community to understand the first principles of photocatalysis and review the recent advancements in this field.
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Affiliation(s)
- Komargoud Prakruthi
- Department of Environmental Engineering, JSS Science and Technology University, Mysuru , 570006, India
| | | | - Shivamurthy Ravindra Yashas
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India
| | - Basavaraju Mahesh
- Department of Chemistry, JSS Academy of Technical Education, Dr. Vishnuvardhan Road, Bengaluru, 560060, India
| | - Ningappa Kumara Swamy
- Department of Chemistry, JSS Science and Technology University, Mysuru, 570006, India.
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14
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Soleimani M, Ghasemi JB, Badiei A. Black titania; novel researches in synthesis and applications. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2021.109092] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Jevtić I, Jakšić S, Simin DČ, Uzelac M, Abramović B. UV-induction of photolytic and photocatalytic degradation of fumonisins in water: reaction kinetics and toxicity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:53917-53925. [PMID: 34041664 DOI: 10.1007/s11356-021-14535-9] [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: 02/10/2021] [Accepted: 05/18/2021] [Indexed: 06/12/2023]
Abstract
Although fumonisins are toxic and carcinogenic mold products that contaminate feed, food, and water, their photodegradation has not yet been reported. In this work, the efficiency of photolysis (UV, UV/H2O2, and UV/[Formula: see text]) and photocatalysis (TiO2 (Degussa P25/Wackherr) and ZnO) for the degradation of fumonisins in an aqueous medium were investigated. In the case of fumonisin B1 (FB1) optimal conditions in terms of pH, the initial concentrations of H2O2/[Formula: see text] for UV, UV/H2O2, and UV/[Formula: see text] treatments were investigated. The photocatalytic degradation using TiO2 Wackherr as catalyst at natural pH (about 8) proved to be the most efficient treatment for removal of FB1 and FB3. Namely, during the first 30 min of irradiation, 99% of FB1 (1.39 μM) was degraded, while FB3 (0.425 μM) was completely removed during the first 20 min of irradiation. In the case of FB2 (0.687 μM), UV/[Formula: see text] was the most efficient treatment, and complete removal occurred in the first 90 min of irradiation. All applied treatments for fumonisins removal have followed pseudo-first-order kinetics under the relevant experimental conditions. Toxicity of fumonisins and their mixtures formed during photodegradation were investigated using mammalian cell lines (BHK, H-4-II-E, Neuro-2a, and MRC-5). The BHK cell line was the most sensitive to fumonisins, especially FB2 and FB3, and its photodegradation mixtures.
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Affiliation(s)
- Ivana Jevtić
- University of Novi Sad Faculty of Sciences, Trg Dositeja Obradovića 3, Novi Sad, 21000, Serbia
| | - Sandra Jakšić
- Scientific Veterinary Institute Novi Sad, Rumenački put 20, Novi Sad, 21000, Serbia.
| | - Dragana Četojević Simin
- Oncology Institute of Vojvodina, Put dr Goldmana 4, Sremska Kamenica, 21204, Serbia
- Singidunum University, Danijelova 32, Belgrade, 11000, Serbia
| | - Maria Uzelac
- University of Novi Sad Faculty of Sciences, Trg Dositeja Obradovića 3, Novi Sad, 21000, Serbia
| | - Biljana Abramović
- University of Novi Sad Faculty of Sciences, Trg Dositeja Obradovića 3, Novi Sad, 21000, Serbia
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16
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Bundschuh M, Zubrod JP, Konschak M, Baudy P, Frombold B, Schulz R. Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:49550-49558. [PMID: 33934305 PMCID: PMC8445855 DOI: 10.1007/s11356-021-14090-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 04/20/2021] [Indexed: 06/12/2023]
Abstract
Nanoparticulate titanium dioxide (nTiO2) is frequently applied, raising concerns about potential side effects on the environment. While various studies have assessed structural effects in aquatic model ecosystems, its impact on ecosystem functions provided by microbial communities (biofilms) is not well understood. This is all the more the case when considering additional stressors, such as UV irradiation - a factor known to amplify nTiO2-induced toxicity. Using pairwise comparisons, we assessed the impact of UV (UV-A = 1.6 W/m2; UV-B = 0.7 W/m2) at 0, 20 or 2000 μg nTiO2/L on two ecosystem functions provided by leaf-associated biofilms: while leaf litter conditioning, important for detritivorous invertebrate nutrition, seems unaffected, microbial leaf decomposition was stimulated (up to 25%) by UV, with effect sizes being higher in the presence of nTiO2. Although stoichiometric and microbial analyses did not allow for uncovering the underlying mechanism, it seems plausible that the combination of a shift in biofilm community composition and activity together with photodegradation as well as the formation of reactive oxygen species triggered changes in leaf litter decomposition. The present study implies that the multiple functions a microbial community performs are not equally sensitive. Consequently, relying on one of the many functions realized by the same microbial community may be misleading for environmental management.
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Affiliation(s)
- Mirco Bundschuh
- iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Fortstraße 7, D-76829, Landau, Germany.
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, SWE-75007, Uppsala, Sweden.
| | - Jochen P Zubrod
- iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Fortstraße 7, D-76829, Landau, Germany
- Eußerthal Ecosystem Research Station, University of Koblenz-Landau, Birkenthalstraße 13, D-76857, Eußerthal, Germany
| | - Marco Konschak
- iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Fortstraße 7, D-76829, Landau, Germany
| | - Patrick Baudy
- iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Fortstraße 7, D-76829, Landau, Germany
| | - Bianca Frombold
- iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Fortstraße 7, D-76829, Landau, Germany
| | - Ralf Schulz
- iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Fortstraße 7, D-76829, Landau, Germany
- Eußerthal Ecosystem Research Station, University of Koblenz-Landau, Birkenthalstraße 13, D-76857, Eußerthal, Germany
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17
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Mehta M, Sharma M, Pathania K, Jena PK, Bhushan I. Degradation of synthetic dyes using nanoparticles: a mini-review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:49434-49446. [PMID: 34350572 DOI: 10.1007/s11356-021-15470-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 07/09/2021] [Indexed: 05/25/2023]
Abstract
The industrial revolution has marked a strong impact on financial upgradation of several countries, and increase in the industrial establishment globally has direct impact on environment because of the release of unwanted product in air and inside the water bodies. The use of dyes has increased tremendously in various industries ranging from food, leather, textile, paper, cosmetic, pharmaceuticals, etc. The problem has emerged due to disposing of the dyes in the open environment, and mostly it is disposed along with the industrial wastes into the water bodies, which becomes harmful for animals, aquatic life and human health. This review highlights the role of the nanoparticles particularly biosynthesized nanoparticles for eliminating the dyes from the industrial wastewater. There are several methods for the synthesis of nanoparticle including physical, chemical and green synthesis of nanoparticles commonly known as biological method. Among all, the biological method is considered as the rapid, easy, eco-friendly and is being performed at mild conditions. The uses of nanoparticles for removal of dyes from water minimize the hazardous impact and thus considered to be the best approach as far as water quality and safety of environment is concerned.
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Affiliation(s)
- Malvika Mehta
- School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu and Kashmir, 182301, India
| | - Mahima Sharma
- School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu and Kashmir, 182301, India
| | - Kamni Pathania
- School of Physics, Shri Mata Vaishno Devi University, Katra, Jammu and Kashmir, 182301, India
| | - Pabitra Kumar Jena
- School of Economics, Shri Mata Vaishno Devi University, Katra, Jammu and Kashmir, 182301, India
| | - Indu Bhushan
- School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu and Kashmir, 182301, India.
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18
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Li H, Wu J, Gao X, Li T, Zhang M, Niu X, Zhang D, Wang Y, Fan H, Wang K. Preparation and Performance Study of Antibacterial Materials Based on GO−TiO
2. ChemistrySelect 2021. [DOI: 10.1002/slct.202101404] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hongxia Li
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Jie Wu
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Xiang Gao
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Tiantian Li
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Mengmeng Zhang
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Xiaohui Niu
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Deyi Zhang
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Yi Wang
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
| | - Haiyan Fan
- Chemistry Department Nazarbayev University Astana 010000 Kazakhstan
| | - Kunjie Wang
- School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China
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19
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Ramasamy K, Dhavamani S, Natesan G, Sengodan K, Sengottayan SN, Tiwari M, Shivendra Vikram S, Perumal V. A potential role of green engineered TiO 2 nanocatalyst towards enhanced photocatalytic and biomedical applications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:41207-41223. [PMID: 33782825 DOI: 10.1007/s11356-021-13530-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
This study demonstrates a simple protocol for phytofabrication of titanium dioxide nanoparticles (TiO2NPs) wrapped with bioactive molecules from Ludwigia octovalvis leaf extract and their characterization by UV-visible absorption spectroscopy, Fourier transform spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectrum (XPS), and diffuse reflectance spectrum (DRS). The bandgap energy of pure green engineered TiO2 nanoparticles was determined by DRS analysis. The XPS analysis confirmed the purity of the TiO2 nanoparticles. Results show that the synthesized TiO2NPs were spherical in shape with the size ranged from 36 to 81 nm. The green engineered titanium oxide nanocatalyst exhibited enhanced rate of photocatalytic degradation of important textile toxic dyes namely crystal violet (93.1%), followed by methylene blue (90.6%), methyl orange (76.7%), and alizarin red (72.4%) after 6-h exposure under sunlight irradiation. Besides, this study determines the antimicrobial efficiency of TiO2NPs (25 μl and 50 μl), leaf extract (25 μl), and antibiotic (25 μl) against clinically isolated human pathogenic bacterial strains namely Staphylococcus aureus, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus vulgaris, Staphylococcus epidermidis, and Escherichia coli. Results show that maximum antibacterial activity with nanotitania treatment noticed was 21.6 and 18.3-mm inhibition in case of S. epidermis and P. aeruginosa, respectively. Enhanced rate of antibiofilm activity towards S. aureus and K. pneumoniae was also observed with TiO2NPs exposure. The biomolecule loaded TiO2NPs exhibited the fastest bacterial deactivation dynamics towards gram-negative bacteria (E. coli), with a complete bacterial inactivation within 105-min exposure. Interestingly, anticancer activity result indicates that percentage of human cervical carcinoma cell (HeLa) viability was negatively correlated with TiO2NPs doses used. The AO/EtBr fluorescent staining result exhibited the occurrence of more apoptosis (dead cells) of HeLa cells due to the exposure of TiO2NPs. Altogether, the present study clearly showed that biomolecules wrapped nanotitania could be used as effective and promising compound for enhanced photocatalytic and biomedical applications in the future.
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Affiliation(s)
- Kawsalya Ramasamy
- Department of Biotechnology, Periyar University, Salem, TN, 636011, India
| | | | - Geetha Natesan
- Department of Botany, Bharathiar University, Coimbatore, TN, 624 046, India
| | - Karthik Sengodan
- Division of Biopesticide and Environmental Toxicology, Sri Paramakalyani Centre for Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, TN, 627 412, India
| | - Senthil-Nathan Sengottayan
- Division of Biopesticide and Environmental Toxicology, Sri Paramakalyani Centre for Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, TN, 627 412, India
| | - Manish Tiwari
- CSIR-National Botanical Research Institute, Lucknow, UP, 226001, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sahi Shivendra Vikram
- Department of Biological Sciences, University of the Sciences, Philadelphia, PA, 19104-4495, USA
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20
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Morjène L, Aloulou F, Tasbihi M, Schwarze M, Schomäcker R, Seffen M. New composite material based on Kaolinite, cement, TiO 2 for efficient removal of phenol by photocatalysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:35991-36003. [PMID: 33686604 DOI: 10.1007/s11356-021-13150-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
Photocatalysis is one of the most important process and was used to eliminate various organic pollutants as phenol in water. In this research study, a new composite containing Kaolinite, cement, and wood fibers modified by titanium oxide TiO2 was elaborated in order to be used in addition of building materials, as photocatalyst for the degradation of phenol. Different kinds and amounts of TiO2 (PC500, P90, and C-TiO2) were immobilized by a simple method inside the composite materials based. The matrix of the hybrid materials was characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), N2 adsorption-desorption (BET), and scanning electron microscope (SEM). These investigations confirmed the dispersion of titania in the new composite materials. The FTIR result has shown that clay particles were successfully treated before their insertion in the composite, by the appearance of two peaks at 2921-2851 cm-1. The XRD results reveal the identification of crystalline phase of TiO2 as anatase. The photocatalytic activity of the composite materials was investigated towards degradation of phenol in aqueous solution under UV light irradiation (369 nm). It has been found that photocatalytic efficiency was significantly enhanced when TiO2 is added. The highest photocatalytic activity has been shown by 3% P90-comp of 41.65% in comparison with 3% PC500 and 3% C-TiO2 which are 29.88% and 22.64 %, respectively. It was shown that the experimental data of kinetic reaction are well fitted by first-order model.
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Affiliation(s)
- Latifa Morjène
- Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, Sousse University-Tunisia, Hammam, 4011, Hammam Sousse, Tunisia
- Department of Environmental Technology: Chair of Environmental Process Engineering, Chemistry Department, University TU Berlin, Sekr. TC8 10623, Berlin, Germany
| | - Fadhel Aloulou
- Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, Sousse University-Tunisia, Hammam, 4011, Hammam Sousse, Tunisia
| | - Minoo Tasbihi
- Department of Environmental Technology: Chair of Environmental Process Engineering, Chemistry Department, University TU Berlin, Sekr. TC8 10623, Berlin, Germany
| | - Michael Schwarze
- Department of Environmental Technology: Chair of Environmental Process Engineering, Chemistry Department, University TU Berlin, Sekr. TC8 10623, Berlin, Germany
| | - Reinhard Schomäcker
- Department of Environmental Technology: Chair of Environmental Process Engineering, Chemistry Department, University TU Berlin, Sekr. TC8 10623, Berlin, Germany
| | - Mongi Seffen
- Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, Sousse University-Tunisia, Hammam, 4011, Hammam Sousse, Tunisia.
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21
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Moles S, Berges J, Ormad MP, Nieto-Monge MJ, Gómez J, Mosteo R. Photoactivation and photoregeneration of TiO2/PAC mixture applied in suspension in water treatments: approach to a real application. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:24167-24179. [PMID: 33511528 DOI: 10.1007/s11356-021-12542-4] [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: 07/02/2020] [Accepted: 01/14/2021] [Indexed: 06/12/2023]
Abstract
The process TiO2/PAC/UV-vis has been under study and compared with the isolated treatments of adsorption and photocatalysis determining possible synergies between adsorption and photocatalysis of target antibiotics: amoxicillin, enrofloxacin, sulfadiazine, and trimethoprim. The characterization of the TiO2/PAC mixture was carried out via FESEM and FTIR. Moreover, a kinetic study has been performed. The effect of UV-vis radiation and the type of matrix was analyzed in TiO2/PAC/UV-vis process. The performance of this treatment has been monitored during three cycles, evaluating also the regeneration of TiO2/PAC mixture by UV-vis light. TiO2/PAC/UV-vis process allowed the removal of the antibiotics in the range 90-100% (an average removal of 93% of the initial concentration) after 60 min of treatment. However, only amoxicillin showed a significant synergy applying TiO2/PAC/UV-vis process. Regarding matrix effect, no influence of the matrix type (ultrapure water or treated wastewater) was observed. Since PAC tends to be deactivated gradually, the TiO2/PAC/UV-vis process performance decreases after each cycle in a 15% average. Finally, regeneration via UV-vis light started to be effective after a total of 4 h of regeneration.
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Affiliation(s)
- Samuel Moles
- Research Group Agua y Salud Ambiental, University of Zaragoza, Zaragoza, Spain.
| | - Javier Berges
- Research Group Agua y Salud Ambiental, University of Zaragoza, Zaragoza, Spain
| | - María P Ormad
- Research Group Agua y Salud Ambiental, University of Zaragoza, Zaragoza, Spain
| | - M Jesús Nieto-Monge
- Research Group Agua y Salud Ambiental, University of Zaragoza, Zaragoza, Spain
| | - Jairo Gómez
- Navarra de Infraestructuras Locales SA, Pamplona, Spain
| | - Rosa Mosteo
- Research Group Agua y Salud Ambiental, University of Zaragoza, Zaragoza, Spain
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22
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Raut SS, Kamble SP, Kulkarni PS. Improved photocatalytic efficiency of TiO 2 by doping with tungsten and synthesizing in ionic liquid: precise kinetics-mechanism and effect of oxidizing agents. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:17532-17545. [PMID: 33400106 DOI: 10.1007/s11356-020-12107-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 12/14/2020] [Indexed: 06/12/2023]
Abstract
The degradation of nitroaromatics/toxic energetic compounds contaminated water is a major cause of concern. W-doped TiO2 nanoparticles (NPs) were synthesized in ionic liquid, ethyl methyl imidazolium dicyanamide (EMIM-DCA) by a solvothermal method. The developed NPs were sintered at 500 °C and characterized by UV-Vis-DRS, FT-IR, FE-SEM, XRD, XPS, and BET techniques. The 30-40-nm-sized NPs were subjected to photocatalytic degradation of the toxic energetic compound, tetryl (2,4,6-trinitrophenylmethylnitramine) under UV-Vis light. Various operating parameters such as the effect of concentration of catalyst, pH of feed phase, oxidizing agents, and recycling of catalyst were studied in detail. For the first time, the degradation-mechanism pathway and kinetics of tetryl were evaluated. The degradation products were precisely analyzed by using HPLC, GC-MS, and TOC techniques. The USEPA has prescribed a drinking water limit of 0.02 mg L-1, and it was found that 0.5 g of 4% W-TiO2 could totally degrade tetryl (50 mg L-1) within 8 h. The kinetic rate constant of 4% W-TiO2 was 0.356 h-1, whereas pure TiO2 showed 0.207 h-1.
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Affiliation(s)
- Sandesh S Raut
- Energy and Environment Laboratory, Department of Applied Chemistry, Defence Institute of Advanced Technology (DU), Ministry of Defence, Pune, 411025, India
| | - Sanjay P Kamble
- Chemical Engineering and Process Development Division, National Chemical Laboratory (NCL), CSIR, Pune, 411008, India
| | - Prashant S Kulkarni
- Energy and Environment Laboratory, Department of Applied Chemistry, Defence Institute of Advanced Technology (DU), Ministry of Defence, Pune, 411025, India.
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23
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Wang X, Huang Y, Zhang K, Shi Y, Lu Z, Wang Y. Inactivation effect and mechanisms of combined ultraviolet and metal-doped nano-TiO 2 on treating Escherichia coli and Enterococci in ballast water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:40286-40295. [PMID: 32661977 PMCID: PMC7358292 DOI: 10.1007/s11356-020-10034-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
The discharge of ship ballast water (containing large amounts of alien organisms) has caused severe ecological hazards to marine environments. In this study, three metal elements (Ag, Fe, and Gd) were doped to nano-TiO2 material respectively (content: 0.4%, 0.7%, and 1.0%) to improve inactivation effect of Escherichia coli and Enterococci in ballast water. Experimental results indicate that compared with the sole ultraviolet (UV) and the UV and original nano-TiO2, the UV and metal-doped nano-TiO2 increased the bacterial inactivation rate to different extents. For each metal element, high external metal content (1.0%) corresponded to high inactivation effort. The doping of Ag resulted in optimal inactivation effort, and the addition of Fe and Gd caused unobvious effort. At the end of the inactivation process (20 s), the UV and 1% Ag-doped nano-TiO2 reached the highest logarithmic sterilization rates (0.915 for Escherichia coli and 0.805 for Enterococcus). The doping of Ag, Fe, and Gd did not change the anatase phase TiO2 crystal form, and 1% Ag-doped nano-TiO2 had the smallest particle diameter and the evenest distribution of nanoparticles. Compared with the sole UV, the UV and Ag-doped nano-TiO2 treatment resulted in higher malondialdehyde contents (0.0646 μmol/L for Escherichia coli and 0.0529 μmol/L for Enterococci) and lower superoxide dismutase activities (0.672 U/mL for Escherichia coli and 0.792 U/mL for Enterococci), which were in accordance with high inactivation rates in these cases.
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Affiliation(s)
- Xixi Wang
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Yanli Huang
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Kun Zhang
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China.
| | - Yue Shi
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China.
| | - Zheng Lu
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Yinhao Wang
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
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Khan MS, Shah JA, Arshad M, Halim SA, Khan A, Shaikh AJ, Riaz N, Khan AJ, Arfan M, Shahid M, Pervez A, Al-Harrasi A, Bilal M. Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO 2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies. Molecules 2020; 25:molecules25194468. [PMID: 33003312 PMCID: PMC7583793 DOI: 10.3390/molecules25194468] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/29/2020] [Accepted: 09/18/2020] [Indexed: 12/16/2022] Open
Abstract
Textile dyes and microbial contamination of surface water bodies have been recognized as emerging quality concerns around the globe. The simultaneous resolve of such impurities can pave the route for an amicable technological solution. This study reports the photocatalytic performance and the biocidal potential of nitrogen-doped TiO2 against reactive black 5 (RB5), a double azo dye and E. coli. Molecular docking was performed to identify and quantify the interactions of the TiO2 with β-lactamase enzyme and to predict the biocidal mechanism. The sol-gel technique was employed for the synthesis of different mol% nitrogen-doped TiO2. The synthesized photocatalysts were characterized using thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET) and diffuse reflectance spectroscopy (DRS). The effects of different synthesis and reaction parameters were studied. RB5 dye degradation was monitored by tracking shifts in the absorption spectrum and percent chemical oxygen demand (COD) removal. The best nanomaterial depicted 5.57 nm crystallite size, 49.54 m2 g−1 specific surface area, 11–40 nm particle size with spherical morphologies, and uniform distribution. The RB5 decolorization data fits well with the pseudo-first-order kinetic model, and the maximum monolayer coverage capacity for the Langmuir adsorption model was found to be 40 mg g−1 with Kads of 0.113 mg−1. The LH model yielded a higher coefficient KC (1.15 mg L−1 h−1) compared to the adsorption constant KLH (0.3084 L mg−1). 90% COD removal was achieved in 60 min of irradiation, confirmed by the disappearance of spectral peaks. The best-optimized photocatalysts showed a noticeable biocidal potential against human pathogenic strain E. coli in 150 min. The biocidal mechanism of best-optimized photocatalyst was predicted by molecular docking simulation against E. coli β-lactamase enzyme. The docking score (−7.6 kcal mol−1) and the binding interaction with the active site residues (Lys315, Thr316, and Glu272) of β-lactamase further confirmed that inhibition of β-lactamase could be a most probable mechanism of biocidal activity.
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Affiliation(s)
- Muhammad Saqib Khan
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.); (A.J.K.); (A.P.)
| | - Jehanzeb Ali Shah
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.); (A.J.K.); (A.P.)
| | - Muhammad Arshad
- Institute of Environmental Sciences and Engineering (IESE), SCEE, National University of Sciences and Technology, Islamabad 44000, Pakistan;
| | - Sobia Ahsan Halim
- Natural and Medical Sciences Research Center, University of Nizwa, P.O. Box 33, Birkat Al Mauz, Nizwa 616, Oman; (S.A.H.); (A.K.)
| | - Ajmal Khan
- Natural and Medical Sciences Research Center, University of Nizwa, P.O. Box 33, Birkat Al Mauz, Nizwa 616, Oman; (S.A.H.); (A.K.)
| | - Ahson Jabbar Shaikh
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan;
| | - Nadia Riaz
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.); (A.J.K.); (A.P.)
| | - Asim Jahangir Khan
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.); (A.J.K.); (A.P.)
| | - Muhammad Arfan
- Department of Chemistry, SNS, National University of Sciences and Technology, Islamabad 44000, Pakistan;
| | - Muhammad Shahid
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Vehari 61100, Pakistan;
| | - Arshid Pervez
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.); (A.J.K.); (A.P.)
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center, University of Nizwa, P.O. Box 33, Birkat Al Mauz, Nizwa 616, Oman; (S.A.H.); (A.K.)
- Correspondence: (A.A.-H.); (M.B.); Tel.: +968-25446328 (A.A.-H.); +92-992-383591 (M.B.)
| | - Muhammad Bilal
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.); (A.J.K.); (A.P.)
- Correspondence: (A.A.-H.); (M.B.); Tel.: +968-25446328 (A.A.-H.); +92-992-383591 (M.B.)
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Gopinath KP, Madhav NV, Krishnan A, Malolan R, Rangarajan G. Present applications of titanium dioxide for the photocatalytic removal of pollutants from water: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 270:110906. [PMID: 32721341 DOI: 10.1016/j.jenvman.2020.110906] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 04/26/2020] [Accepted: 06/01/2020] [Indexed: 05/20/2023]
Abstract
The evolution of modern technology and industrial processes has been accompanied by an increase in the utilization of chemicals to derive new products. Water bodies are frequently contaminated by the presence of conventional pollutants such as dyes and heavy metals, as well as microorganisms that are responsible for various diseases. A sharp rise has also been observed in the presence of new compounds heretofore excluded from the design and evaluation of wastewater treatment processes, categorized as "emerging pollutants". While some are harmless, certain emerging pollutants possess the ability to cause debilitating effects on a wide spectrum of living organisms. Photocatalytic degradation has emerged as an increasingly popular solution to the problem of water pollution due to its effectiveness and versatility. The primary objective of this study is to thoroughly scrutinize recent applications of titanium dioxide and its modified forms as photocatalytic materials in the removal and control of several classes of water pollutants as reported in literature. Different structural modifications are used to enhance the performance of the photocatalyst such as doping and formation of composites. The principles of these modifications have been scrutinized and evaluated in this review in order to present their advantages and drawbacks. The mechanisms involved in the removal of different pollutants through photocatalysis performed by TiO2 have been highlighted. The factors affecting the mechanism of photocatalysis and those affecting the performance of different TiO2-based photocatalysts have also been thoroughly discussed, thereby presenting a comprehensive view of all aspects involved in the application of TiO2 to remediate and control water pollution.
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Affiliation(s)
| | - Nagarajan Vikas Madhav
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Abhishek Krishnan
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Rajagopal Malolan
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Goutham Rangarajan
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Ontario, M5S 3E5, Canada
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Bouabibsa I, Alhussein A, Lamri S, Sanchette F, Rtimi S. Biological responses at the interface of Ti-doped diamond-like carbon surfaces for indoor environment application. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:31120-31129. [PMID: 32474782 DOI: 10.1007/s11356-020-09376-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Accepted: 05/19/2020] [Indexed: 06/11/2023]
Abstract
Diamond-like carbon (DLC) and titanium-doped DLC coatings were prepared by hybrid PECVD/direct current magnetron sputtering (DCMS). In this study, we show that the operating conditions of titanium-doped DLC coatings used for implants in surgical devices significantly modify their surface properties and consequently their interaction with cells. The coatings showed uniform distribution on the substrate and their biocompatibility was tested by way of rat calvaria osteoblasts. Doping DLC with Ti changed the roughness and wettability of the film interface. The autoclaving of the samples led to the surface oxidation and the formation of TiO2 on the top-most layers of Ti-doped DLC. This was quantitatively assessed by X-ray photoelectron spectroscopy (XPS) and revealed the presence of Ti3+ and Ti4+ species in redox reactions during their interactions with cells. By XPS analysis, the oxidative carbonaceous species C=O and O=C-C were detected during the bacterial inactivation. Reactive oxygen species (ROS) were identified on the sputtered samples and the ⦁OH radical was identified as the most important oxidative radical intermediate leading to bacterial disinfection. The position of the intra-gap of the oxidized C species is suggested within the TiO2 bandgap.
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Affiliation(s)
- Imane Bouabibsa
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
| | - Akram Alhussein
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France.
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France.
| | - Salim Lamri
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
| | - Frederic Sanchette
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
| | - Sami Rtimi
- EPFL-SB-SB-GPAO, Ecole Polytechnique Fédérale de Lausanne, Station 6, 1015, Lausanne, Switzerland
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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: 73] [Impact Index Per Article: 18.3] [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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Huang SM, Weng CH, Tzeng JH, Huang YZ, Anotai J, Yen LT, Chang CJ, Lin YT. Kinetic study and performance comparison of TiO 2-mediated visible-light-responsive photocatalysts for the inactivation of Aspergillus niger. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 692:975-983. [PMID: 31540001 DOI: 10.1016/j.scitotenv.2019.07.329] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 07/17/2019] [Accepted: 07/20/2019] [Indexed: 05/23/2023]
Abstract
Fungi are highly survived with exceptional resistance to environmental stress. Conventional fungicides are quite efficient, but the increase in use raises severe environmental problems. In this study, environmentally friendly TiO2-mediated visible-light-responsive photocatalysts, namely N-TiO2, N-T-TiO2, C-TiO2, and Pd-C-TiO2, were used to compare the performance of disinfecting a mold fungi Aspergillus niger. Key parameters, including photocatalyst dosage, the initial fungal concentration, and visible-light intensity, affecting the disinfecting process, was investigated. A new developed Light-responsive Modified Hom's (LMH) kinetic model incorporating visible-light intensity and photocatalyst light-absorption coefficient was firstly used to predict such photocatalytic process in fungal inactivation. Among the photocatalysts, Pd-C-TiO2 showed the highest inactivation performance against fungi, followed by C-TiO2, N-T-TiO2, and N-TiO2. In general, inactivation increased with increasing photocatalyst dosage and light intensity while decreased with increasing initial fungal concentration. For kinetic modeling, the LMH model supports the hypothesis that photocatalyst performance toward visible-light-driven fungal inactivation primarily depends on the light-absorption capacity of the photocatalyst. In conclusion, mold fungi Aspergillus niger are effectively disinfected by TiO2-mediated visible-light-responsive photocatalysts, and such fungal inactivation process could be predicted by LMH kinetic model.
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Affiliation(s)
- Shang-Ming Huang
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 40227, Taiwan; Department of Soil and Environmental Science, National Chung Hsing University, Taichung 40227, Taiwan
| | - Chih-Huang Weng
- Department of Civil and Ecological Engineering, I-Shou University, Kaohsiung 84008, Taiwan
| | - Jing-Hua Tzeng
- Department of Soil and Environmental Science, National Chung Hsing University, Taichung 40227, Taiwan; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA
| | - Ya-Zhen Huang
- Department of Soil and Environmental Science, National Chung Hsing University, Taichung 40227, Taiwan
| | - Jin Anotai
- Department of Environmental Engineering, King Mongkut's University of Technology Thonburi, Tungkru, Bangkok, Thailand
| | - Li-Ting Yen
- Department of Soil and Environmental Science, National Chung Hsing University, Taichung 40227, Taiwan
| | - Che-Jui Chang
- Department of Soil and Environmental Science, National Chung Hsing University, Taichung 40227, Taiwan
| | - Yao-Tung Lin
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 40227, Taiwan; Department of Soil and Environmental Science, National Chung Hsing University, Taichung 40227, Taiwan.
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Milošević I, Rtimi S, Jayaprakash A, van Driel B, Greenwood B, Aimable A, Senna M, Bowen P. Synthesis and characterization of fluorinated anatase nanoparticles and subsequent N-doping for efficient visible light activated photocatalysis. Colloids Surf B Biointerfaces 2018; 171:445-450. [DOI: 10.1016/j.colsurfb.2018.07.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 06/22/2018] [Accepted: 07/16/2018] [Indexed: 10/28/2022]
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Hajjaji A, Elabidi M, Trabelsi K, Assadi A, Bessais B, Rtimi S. Bacterial adhesion and inactivation on Ag decorated TiO2-nanotubes under visible light: Effect of the nanotubes geometry on the photocatalytic activity. Colloids Surf B Biointerfaces 2018; 170:92-98. [DOI: 10.1016/j.colsurfb.2018.06.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 06/02/2018] [Accepted: 06/04/2018] [Indexed: 10/14/2022]
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Díez-Pascual AM. Antibacterial Activity of Nanomaterials. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E359. [PMID: 29882933 PMCID: PMC6027337 DOI: 10.3390/nano8060359] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 05/23/2018] [Accepted: 05/23/2018] [Indexed: 01/22/2023]
Affiliation(s)
- Ana María Díez-Pascual
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Biology, Environmental Sciences and Chemistry, Institute of Chemistry Research "Andrés M. del Río" (IQAR), University of Alcalá, Ctra. Madrid-Barcelona, Km. 33.6, 28871 Alcalá de Henares, Madrid, Spain.
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A Facile Approach to Prepare Black TiO₂ with Oxygen Vacancy for Enhancing Photocatalytic Activity. NANOMATERIALS 2018; 8:nano8040245. [PMID: 29659500 PMCID: PMC5923575 DOI: 10.3390/nano8040245] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/07/2018] [Accepted: 04/13/2018] [Indexed: 12/30/2022]
Abstract
Black TiO2 has triggered worldwide research interest due to its excellent photocatalytic properties. However, the understanding of its structure–property relationships and a more effective, facile and versatile method to produce it remain great challenges. We have developed a facile approach to synthesize black TiO2 nanoparticles with significantly improved light absorption in the visible and infrared regions. The experimental results show that oxygen vacancies are the major factors responsible for black coloration. More importantly, our black TiO2 nanoparticles have no Ti3+ ions. These oxygen vacancies could introduce localized states in the bandgap and act as trap centers, significantly decreasing the electron–hole recombination. The photocatalytic decomposition of both rhodamine B and methylene blue demonstrated that, under ultraviolet light irradiation, better photocatalytic performance is achieved with our black TiO2 nanoparticles than with commercial TiO2 nanoparticles.
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