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Patar S, Mittal R, Yasmin F, Bhuyan BK, Borthakur LJ. Photocatalytic degradation of antibiotics by N-doped carbon nanoflakes-nickel ferrite composite derived from algal biomass. CHEMOSPHERE 2024; 363:142908. [PMID: 39033863 DOI: 10.1016/j.chemosphere.2024.142908] [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: 05/26/2024] [Revised: 07/17/2024] [Accepted: 07/18/2024] [Indexed: 07/23/2024]
Abstract
This work reports the synthesis of nickel ferrite (NiFe) nanoparticles, N-doped mesoporous carbon nanoflakes (NCF) and novel nickel ferrite-carbon nanoflakes (NiFe@NCF) nanocomposite using solvothermal method. NCF was derived from a cyanobacterial consortium consisting of Anabaena, Lyngbya and Weistiellopsis, rich in carbon and nitrogen. The synthesized nanoparticles were used as heterogeneous photocatalyst for degradation of two harmful water pollutants, ciprofloxacin (CIP) and levofloxacin (LEV). 99.91% LEV and 98.86% CIP were degraded within 50 and 70 min of visible light irradiation using NiFe@NCF following pseudo first order kinetics. This improved efficiency of the nanocomposite may be attributed to its higher surface area, reduction of band gap (from 2.42 to 2.19 eV), more active sites as well as charge carrier mobility with decreasing agglomeration tendency of the magnetic nickel nanoparticles upon being embedded on NCF. N-doping improves light harvesting property, retards charge recombination and extends as well as delocalises ᴨ-conjugated system resulting in enhanced photocatalytic activity. The scavenging experiments and EPR analysis reveal that O2-• and •OH are the main active species taking part in the degradation process. The material performs well within a wide range of pH and can be effectively used up to 5 repetitive cycles. A feasible photocatalytic degradation mechanism of the antibiotics against NiFe@NCF nanocomposite is also put forwarded along with their possible degradation pathways from LCMS studies.
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Affiliation(s)
- Shyamalee Patar
- Department of Chemistry, Gauhati University, Guwahati, Assam, India, Pin-781014
| | - Rishi Mittal
- Department of Environmental Science and Engineering, Guru Jambheshwar University of Science & Technology, Hisar, Haryana, India, Pin-125001
| | - Farishta Yasmin
- Department of Botany, Nowgong College (Autonomous), Nagaon, Assam, India, Pin-782001
| | - Balin Kumar Bhuyan
- Department of Chemistry, Nowgong Girls' College, Nagaon, Assam, India, Pin-782002
| | - Lakhya Jyoti Borthakur
- Department of Chemistry, Nowgong College (Autonomous), Nagaon, Assam, India, Pin-782001.
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Ankita B, Rakshitha R, Pallavi N. Degradation of cefixime by photocatalysis via Ba-doped BiFeO 3 nanomaterial using RSM analysis under LED light source. ENVIRONMENTAL MONITORING AND ASSESSMENT 2024; 196:625. [PMID: 38884667 DOI: 10.1007/s10661-024-12781-1] [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: 02/27/2024] [Accepted: 06/06/2024] [Indexed: 06/18/2024]
Abstract
In the current work, Response Surface Methodology (RSM)-a statistical method-is used to optimize procedures like photocatalysis with the least amount of laboratory testing. However, to determine the most effective model for achieving the maximum rate of removal efficiency, the Response Surface Methodology was employed. The Ba-doped BiFeO3 photocatalyst was synthesized by the co-precipitation method, and its intrinsic properties were investigated by utilizing a range of spectroscopic techniques, such as FESEM, EDX, XRD, FTIR, and UV-vis. Herein, four independent factors such as, pH, contact time, pollutant concentration, and catalyst dosage were chosen. The results revealed that under acidic conditions with a contact duration of 2 min, a moderate catalyst dosage, and higher pollutant concentration, a degradation rate of 89.8% was achieved. The regression coefficient (R2) and probability value (P) were determined to be 0.99551 and 0.0301, respectively, therefore confirming the excellent fit of the RSM model. Furthermore, this research investigated the potential photocatalytic degradation mechanisms of cefixime, demonstrating that the removal efficiency of cefixime is greatly influenced by the functional parameters.
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Affiliation(s)
- Bhattacherjee Ankita
- Department of Environmental Science, School of Life Sciences, JSS Academy of Higher Education & Research, S. S. Nagar, Mysuru, 570015, Karnataka, India
| | - Rajashekara Rakshitha
- Department of Environmental Science, School of Life Sciences, JSS Academy of Higher Education & Research, S. S. Nagar, Mysuru, 570015, Karnataka, India
| | - Nagaraju Pallavi
- Department of Environmental Science, School of Life Sciences, JSS Academy of Higher Education & Research, S. S. Nagar, Mysuru, 570015, Karnataka, India.
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Meky AI, Hassaan MA, Fetouh HA, Ismail AM, El Nemr A. Hydrothermal fabrication, characterization and RSM optimization of cobalt-doped zinc oxide nanoparticles for antibiotic photodegradation under visible light. Sci Rep 2024; 14:2016. [PMID: 38263230 PMCID: PMC11231344 DOI: 10.1038/s41598-024-52430-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 01/18/2024] [Indexed: 01/25/2024] Open
Abstract
Photodegradation is considered a significant method engaged for the elimination of organic pollutants from water. In this work, hydrothermal cobalt-doped zinc oxide nanoparticles (Hy-Co-ZnO NPs) loaded with 5, 10, and 15% cobalt were prepared in a hydrothermal way and were investigated as a photocatalyst for the Ciprofloxacin (CIPF) degradation under visible irradiation using LED-light. Characterization approaches such as FTIR, XRD, XPS, DRS UV-vis spectroscopy, SEM, TEM, BET, EDX and TGA were used for the investigation of the fabricated Hy-Co-ZnO NPs. The studies indicated that 10% Hy-Co-ZnO NPs was the most efficient catalyst for the CIPF photolysis compared to ZnO NPs and other Hy-Co-ZnO NPs with 5 and 15% cobalt content. Higher photocatalytic activity (> 98%) of 20 mg/L of CIPF solution was attained within 60 min. The reaction kinetics showed that the first-order model is suitable for displaying the rate of reaction and amount of CIPF elimination with R2 = 0.9883. Moreover, Central composite design (CCD) optimization of the 10% Hy-Co-ZnO NPs was also studied.
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Affiliation(s)
- Asmaa I Meky
- Department of Chemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Mohamed A Hassaan
- Environment Division, National Institute of Oceanography and Fisheries (NIOF), Kayet Bey, Elanfoushy, Alexandria, Egypt
| | - Howida A Fetouh
- Department of Chemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Amel M Ismail
- Department of Chemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Ahmed El Nemr
- Environment Division, National Institute of Oceanography and Fisheries (NIOF), Kayet Bey, Elanfoushy, Alexandria, Egypt.
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Ganeshbabu M, Priya JS, Manoj GM, Puneeth NPN, Shobana C, Shankar H, Selvan RK. Photocatalytic degradation of fluoroquinolone antibiotics using chitosan biopolymer functionalized copper oxide nanoparticles prepared by facile sonochemical method. Int J Biol Macromol 2023; 253:127027. [PMID: 37751823 DOI: 10.1016/j.ijbiomac.2023.127027] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 08/31/2023] [Accepted: 09/20/2023] [Indexed: 09/28/2023]
Abstract
Photocatalytic degradation is an excellent method for removing pharmaceutical residues due to their simplicity, ecological benignity, high efficiency, and exceptional stability. Herein, we demonstrate the sonochemically synthesised chitosan biopolymer functionalized copper oxide nanoparticles as an efficient photocatalyst for the degradation of fluoroquinolone-based antibiotics. The X-ray diffraction Rietveld refinement revealed the formation of single-phase copper oxide (CuO) with a monoclinic structure. The presence of biopolymer functionalization was corroborated by Fourier Transform Infrared spectroscopy by observing the -NH2 and -OH functional groups. The high-resolution transmission electron microscopic images inferred that Chitosan functionalized copper oxide (C-CuO) particles are nano-sized with a smooth texture and aggregation-free particles. The strong absorbance and the broad photoluminescence emission in the ultraviolet-visible region confirm the suitability of CuO and C-CuO nanoparticles for photocatalytic applications. The catalytic activity was studied against fluoroquinolone-based antibiotics such as ciprofloxacin and norfloxacin under direct sunlight illumination. Interestingly, the C-CuO catalyst demonstrated 71.07 % (@140 min.) and 71.9 % (@60 min.) of degradation for ciprofloxacin and norfloxacin, respectively. The obtained photocatalytic activity of the prepared CuO and C-CuO catalysts was superior to the CuO particles prepared by the coprecipitation method (CC-CuO).
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Affiliation(s)
- M Ganeshbabu
- Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641046, Tamil Nadu, India
| | - J Shiva Priya
- Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641046, Tamil Nadu, India
| | - G Murali Manoj
- Department of Physics, KPR Institute of Engineering and Technology, Coimbatore 641407, India
| | - N Prasanna Naga Puneeth
- Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641046, Tamil Nadu, India
| | - C Shobana
- Department of Zoology, Kongunadu Arts and Science College, G.N. Mills, Coimbatore 641 029, India
| | - H Shankar
- Department of Physics, KPR Institute of Engineering and Technology, Coimbatore 641407, India.
| | - R Kalai Selvan
- Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641046, Tamil Nadu, India.
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Sonkar R, Mondal NJ, Thakur S, Saikia E, Ghosh MP, Chowdhury D. Cobalt-substituted ZnS QDs: a diluted magnetic semiconductor and efficient photocatalyst. NANOSCALE ADVANCES 2023; 5:7042-7056. [PMID: 38059034 PMCID: PMC10696947 DOI: 10.1039/d3na00836c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 11/07/2023] [Indexed: 12/08/2023]
Abstract
Recently, understanding the origin of induced magnetic characteristics in transition metal atom-doped QDs has been a major focus owing to their potential applications in the area of spintronic devices. A detailed experimental and theoretical investigation was conducted to understand the physical properties of Co-doped ZnS QDs containing different weight percentages of Co atoms [CoxZn1-xS (x = 0.00, 0.03, 0.06, and 0.09)], prepared using chemical co-precipitation techniques. X-ray diffraction studies proved that all the prepared QDs formed an extremely pure cubic zinc blende crystallographic phase free of contaminants. The validation of the quantum dot nature of all the samples was provided by the HRTEM images, BET studies, and blue shift in the absorption spectra. Both the obtained FTIR and PL spectra at room temperature also confirmed the phase purity of the prepared QDs. The observed weak ferromagnetic behavior of the doped samples was due to the presence of p-d hybridization between the 3d levels of Co2+ ions and 3p levels of S2- ions of the host ZnS QDs. Hysteresis loops that were obtained at room temperature validated this weak ferromagnetic nature. These obtained results were also supported theoretically using DFT calculations. FDTD simulations provided a detailed explanation for the observed blue shift in the absorption spectra originating from the quantum confinement effect of doped and undoped ZnS QDs. The dielectric properties of all the samples were examined properly, and it was also found that the grain boundaries contributed effectively to providing the dielectric response. The doped ZnS sample containing more Co dopants at low frequencies showed a progressive rise in polarisation loss. In addition, Co-doped ZnS QDs are efficient photocatalysts. A pH-dependent photodegradation test of ciprofloxacin (CIP) antibiotic was conducted using 9% Co-doped ZnS QDs. It was observed that 9% Co-doped ZnS nanocatalysts has sufficient capability to degrade CIP to around 94.7% in a solution of pH 10 within one hour. Therefore, besides showing photocatalytic effects, Co-doped ZnS QDs act as ideal dilute magnetic semiconductors (DMSs) and will undoubtedly become excellent candidates for the microelectronics industry because of their special ability to exhibit spin-dependent magneto-electro-optical properties that find use in spin-polarized light-emitting diodes, solid-state lasers, and spin-transistor devices.
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Affiliation(s)
- Rahul Sonkar
- Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon Garchuk Guwahati 781035 Assam India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Nur Jalal Mondal
- Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon Garchuk Guwahati 781035 Assam India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Samir Thakur
- Department of Applied Sciences, Gauhati University Guwahati 781014 Assam India
| | - Eeshankur Saikia
- Department of Applied Sciences, Gauhati University Guwahati 781014 Assam India
| | - Mritunjoy Prasad Ghosh
- Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon Garchuk Guwahati 781035 Assam India
| | - Devasish Chowdhury
- Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon Garchuk Guwahati 781035 Assam India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
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El-Sayyad GS, Abd Elkodous M, El-Bastawisy HS, El Rouby WMA. Potential antibacterial, antibiofilm, and photocatalytic performance of gamma-irradiated novel nanocomposite for enhanced disinfection applications with an investigated reaction mechanism. BMC Microbiol 2023; 23:270. [PMID: 37752448 PMCID: PMC10521429 DOI: 10.1186/s12866-023-03016-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 09/11/2023] [Indexed: 09/28/2023] Open
Abstract
BACKGROUND Water scarcity is now a global challenge due to the population growth and the limited amount of available potable water. In addition, modern industrialization, and microbial pathogenesis is resulting in water pollution on a large scale. METHODS In the present study, reusable Co0.5Ni0.5Fe2O4/SiO2/TiO2 composite matrix was incorporated with CdS NPs to develop an efficient photocatalyst, and antimicrobial agents for wastewater treatment, and disinfection purpose. The antibacterial performance of the gamma-irradiated samples was evaluated against various types of Gram-positive bacteria using ZOI, MIC, antibiofilm, and effect of UV-exposure. Antibacterial reaction mechanism was assessed by bacterial membrane leakage assay, and SEM imaging. In addition, their photocatalytic efficiency was tested against MB cationic dye as a typical water organic pollutant. RESULTS Our results showed that, the formed CdS NPs were uniformly distributed onto the surface of the nanocomposite matrix. While, the resulted CdS-based nanocomposite possessed an average particle size of nearly 90.6 nm. The antibacterial performance of the prepared nanocomposite was significantly increased after activation with gamma and UV irradiations. The improved antibacterial performance was mainly due to the synergistic effect of both TiO2 and CdS NPs; whereas, the highest photocatalytic efficiency of MB removal was exhibited in alkaline media due to the electrostatic attraction between the cationic MB and the negatively-charged samples. In addition, the constructed heterojunction enabled better charge separation and increased the lifetime of the photogenerated charge carriers. CONCLUSION Our results can pave the way towards the development of efficient photocatalysts for wastewater treatment and promising antibacterial agents for disinfection applications.
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Affiliation(s)
- Gharieb S El-Sayyad
- Drug Radiation Research Department, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.
| | - M Abd Elkodous
- Center for Nanotechnology (CNT), School of Engineering and Applied Science, Nile University, Sheikh Zayed, Giza, 16453, Egypt.
| | - Hanan S El-Bastawisy
- Drug Radiation Research Department, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Waleed M A El Rouby
- Material Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences (PSAS), Beni-Suef University, Beni-Suef, 62511, Egypt
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Manjunatha M, Mahalingam H. Upcycling of waste EPS beads to immobilized codoped TiO 2 photocatalysts for ciprofloxacin degradation and E. coli disinfection under sunlight. Sci Rep 2023; 13:14631. [PMID: 37670130 PMCID: PMC10480149 DOI: 10.1038/s41598-023-41705-1] [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: 05/31/2023] [Accepted: 08/30/2023] [Indexed: 09/07/2023] Open
Abstract
The emerging global problem of antimicrobial resistance needs immediate attention. In this regard, this work demonstrates the use of expanded polystyrene waste in the synthesis of immobilized photocatalytic films for the treatment of antibiotics as well as for bacterial disinfection. A boron-cerium codoped TiO2 catalyst (of specific composition: B0.8Ce0.2TiO2) was immobilized in an expanded polystyrene (EPS) film prepared from waste EPS beads. These films were studied for the degradation of ciprofloxacin (CIP) and disinfection of E. coli under sunlight. The film with a catalyst loading of 20 wt% showed a maximum degradation of 89% in 240 min with a corresponding TOC reduction of 84%. A 7.4 and 6.3 log reduction from the bacterial inactivation studies in the presence and absence of antibiotics, respectively, was obtained. The EPS film was stable after five times of reuse, and no significant chemical changes in the used film were observed from FTIR analysis. The average thickness of the prepared film was found from FESEM analysis to be 1.09 mm. These EPS films were also tested for degradation of other antibiotics, such as norfloxacin, levofloxacin and moxifloxacin. The EPS films were tested in two different reactor volumes at optimum conditions. Also, the effectiveness of B0.8Ce0.2TiO2/EPS film in real water samples indicates its potential in large-scale and real-world applications. Thus, these B0.8Ce0.2TiO2/EPS films can be effectively employed for both degradation of ciprofloxacin and the disinfection of E. coli under solar light to solve the increasing problem of antimicrobial resistance.
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Affiliation(s)
- Manasa Manjunatha
- Department of Chemical Engineering, National Institute of Technology Karnataka (NITK) Surathkal, Mangalore, Karnataka, 575025, India
| | - Hari Mahalingam
- Department of Chemical Engineering, National Institute of Technology Karnataka (NITK) Surathkal, Mangalore, Karnataka, 575025, India.
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Roy TS, Akter S, Fahim MR, Gafur MA, Ferdous T. Incorporation of Ag-doped ZnO nanorod through Graphite hybridization: Effective approach for degradation of Ciprofloxacin. Heliyon 2023; 9:e13130. [PMID: 36846701 PMCID: PMC9950824 DOI: 10.1016/j.heliyon.2023.e13130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 01/16/2023] [Accepted: 01/17/2023] [Indexed: 01/22/2023] Open
Abstract
To remove the Ciprofloxacin (CIP) from aqueous solution, ZnO-Ag-Gp nanocomposite exhibited efficient photocatalytic properties. The biopersistent CIP is pervasive in surface water and also hazardous to human and animal health. This study utilized the hydrothermal technique to prepare Ag-doped ZnO hybridizing Graphite (Gp) sheet (ZnO-Ag-Gp) to degrade pharmaceuticals pollutant CIP from an aqueous medium. The structural and chemical compositions of the photocatalysts were determined by XRD, FTIR and XPS analysis. FESEM and TEM images revealed the nanorod ZnO with round shape Ag distributed on a Gp surface. The reduced bandgap of the ZnO-Ag-Gp sample enhanced the photocatalytic property which was measured by using UV-vis Spectroscopy. Dose optimization study found that 1.2 g/L is optimum for single (ZnO) and binary (ZnO-Gp and ZnO-Ag), where 0.3 g/L ternary (ZnO-Ag-Gp) exhibited maximum degradation efficiency (98%) within 60 min for 5 mg/L CIP. Pseudo 1st order reaction kinetics rate was found highest for ZnO-Ag-Gp (0.05983 min-1) and it decreased to 0.03428 min-1 for annealed sample. Removal efficiency decreased to only 90.97% at 5th run and hydroxyl radicals played a vital role to degrade CIP from aqueous solution. UV/ZnO-Ag-Gp will be a promising technique to degrade wide-ranging pharmaceutical antibiotics from the aquatic medium.
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Affiliation(s)
- Tanu Shree Roy
- Department of Physics, Bangladesh University of Textiles, Dhaka, Bangladesh,Department of Physics, Jahangirnagar University, Savar Union, Bangladesh
| | - Surya Akter
- Bangladesh Council of Scientific and Industrial Research, Dhaka, Bangladesh,Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
| | - Monabbir Rafsan Fahim
- Department of Textile Engineering Management, Bangladesh University of Textiles, Dhaka, Bangladesh
| | - Md. Abdul Gafur
- Bangladesh Council of Scientific and Industrial Research, Dhaka, Bangladesh,Corresponding author.
| | - Tahmina Ferdous
- Department of Physics, Jahangirnagar University, Savar Union, Bangladesh
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Wanakai IS, Kareru GP, Sujee MD, Madivoli SE, Gachui ME, Kairigo KP. Kinetics of Rifampicin Antibiotic Degradation Using Green Synthesized Iron Oxide Nanoparticles. CHEMISTRY AFRICA 2022. [DOI: 10.1007/s42250-022-00543-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bisht K, Kumar G, Dutta RK. Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi 2WO 6 Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Krishanan Bisht
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee247667, India
| | - Gandharve Kumar
- Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee247667, India
| | - Raj Kumar Dutta
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee247667, India
- Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee247667, India
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Solid waste derived nanocomposite of Ag (0) loaded Fe2O3-SiO2 for solar power degradation of antibiotics. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Copper sulfide and zinc oxide hybrid nanocomposite for wastewater decontamination of pharmaceuticals and pesticides. Sci Rep 2022; 12:18153. [PMID: 36307472 PMCID: PMC9616815 DOI: 10.1038/s41598-022-22795-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 10/19/2022] [Indexed: 12/31/2022] Open
Abstract
In this work, hybrid nanocomposites of CuS QDs @ ZnO photocatalysts are fabricated through a facile microwave-assisted (MW) hydrothermal method as a green preparation process. The prepared photocatalysts (PCs) are employed under simulated sunlight (SL) for the degradation of ciprofloxacin, ceftriaxone, ibuprofen pharmaceuticals, methylene blue dye, and 2,4,5-trichlorophenoxyacetic acid (2,4-D) pesticide. The prepared photocatalysts are characterized in detail using several compositional, optical, and morphological techniques. The influence of the CuS (QDs) wt. % on morphological, structural, as well as photocatalytic degradation efficiency have been investigated. The small displacement between the (107) plane of CuS and the (102) plane of ZnO can confirmed the existence of lattice interaction, implying the formation of p-n heterojunctions. TEM and XRD results demonstrated that the CuS QDs are established and uniformly decorated on the surface of ZnO NRs, confirming the forming of an efficient CuS QDs @ ZnO heterojunction nanostructures. The CuS QDs @ ZnO hybrid nanocomposites showed enhancement in crystallinity, light absorption, surface area, separation of e-h pair and inhibition in their recombination at an interfacial heterojunction. In addition it is found that, 3 wt% CuS QDs @ ZnO has the foremost influence. The results showed improvement of photocatalytic activity of the 3% CuS QDs @ ZnO hybrid nanocomposite as compared to the bare ZnO nanorods. The impressive photocatalytic performance of CuS @ ZnO heterostructure nanorods may be attributed to efficient charge transfer. The prepared CuS QDs @ ZnO hybrid nanocomposites exhibited 100% removal for MB dye, after 45 min, and after 60 min for ibuprofen, ciprofloxacin pharmaceuticals, and 2.4.5 trichloro phenoxy acetic acid pesticide with the catalyst amount of 0.2 g/L. Although 100% removal of ceftriaxone pharmaceutical acheived after 90 min. In addition CuS QDs @ ZnO hybrid nanocomposites exhibited complete removal of COD for ibuprofen, ceftriaxone pharmaceuticals and 2.4.5 trichloro phenoxy acetic acid pesticide after 2 h with no selectivity. Briefly, 3% CuS QDs@ZnO hybrid nanocomposites can be considered as promising photoactive materials under simulated sunlight for wastewater decontamination.
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Potential of Fluoride-Containing Zinc Oxide and Copper Oxide Nanocomposites on Dentin Bonding Ability. NANOMATERIALS 2022; 12:nano12081291. [PMID: 35457999 PMCID: PMC9025052 DOI: 10.3390/nano12081291] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 04/01/2022] [Accepted: 04/06/2022] [Indexed: 12/04/2022]
Abstract
Despite recent advances in bonding restorations, which are the basis of restorative dentistry, secondary caries are still able to form. Previously, a novel fluoride-containing zinc and copper (ZCF) nanocomposite was introduced to prevent the formation of caries due to its antibacterial activity. In this study, we studied the impact of ZCF nanoparticles on the adhesive strength of bonding restorations through micro-tensile bond strength (µTBS) testing. The impact of antibacterial and matrix metalloproteinase (MMP) inhibitors on the nanoparticles was also examined. The nanocomposites were prepared using a simple one-step homogeneous co-precipitation method at a low temperature. A self-etch adhesive was applied to 10 extracted caries-free human molars with (test group) and without (control group) the ZCF nanoparticles. This was followed by composite resin build-up and µTBS testing, MMP activity assays, and evaluation of the antibacterial effects. The results showed no significant differences in the µTBS between the ZCF and the control groups. However, the ZCF exhibited a significant inhibitory effect against MMP-2, MMP-8, and MMP-9, in addition to an antibacterial effect on Streptococcus mutans. Therefore, the present study demonstrated that the addition of ZCF nanoparticles to adhesive systems can result in MMP inhibition and antibacterial action while maintaining the mechanical properties of the bonding restorations.
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Kumar G, Cilamkoti V, Dutta RK. Sunlight mediated enhanced photocatalytic degradation of antibiotics in aqueous medium using silicon doped carbon quantum dots decorated Bi2MoO6 nanoflakes. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128368] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Rajan MS, John A, Thomas J. Nanophotocatalysis for the Removal of Pharmaceutical Residues from
Water Bodies: State of Art and Recent Trends. CURR ANAL CHEM 2022. [DOI: 10.2174/1573411017666210412095354] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
Background:
The occurrence of pharmaceuticals in surface and drinking water is ubiquitous
and is a major concern of researchers. These compounds cause a destructive impact on
aquatic and terrestrial life forms, and the removal of these compounds from the environment is a
challenging issue. Existent conventional wastewater treatment processes are generally inefficacious
because of their low degradation efficiency and inadequate techniques associated with the disposal
of adsorbed pollutants during comparatively effective methods like the adsorption process.
Remediation Method:
Semiconductor-mediated photocatalysis is an attractive technology for the
efficient removal of pharmaceutical compounds. Among various semiconductors, TiO2 and ZnObased
photocatalysts gained much interest during the last years because of their efficiency in decomposing
and mineralizing the lethal organic pollutants with the utilization of UV-visible light.
Incessant efforts are being undertaken for tuning the physicochemical, optical, and electronic properties
of these photocatalysts to strengthen their overall photocatalytic performance with good recycling
efficiency.
Results:
This review attempts to showcase the recent progress in the rational design and fabrication
of nanosized TiO2 and ZnO photocatalysts for the removal of pollutants derived from the pharmaceutical
industry and hospital wastes.
Conclusion:
Photocatalysis involving TiO2 and ZnO provides a positive impact on pollution management
and could be successfully applied to remove pharmaceuticals from wastewater streams.
Structure modifications, the introduction of heteroatoms, and the integration of polymers with
these nano photocatalysts offer leapfrogging opportunities for broader applications in the field of
photocatalysis.
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Affiliation(s)
- Mekha Susan Rajan
- Research Department of Chemistry, Kuriakose Elias College, Mannanam, Kottayam, Kerala 686561,India
| | - Anju John
- Research Department of Chemistry, Kuriakose Elias College, Mannanam, Kottayam, Kerala 686561,India
| | - Jesty Thomas
- Research Department of Chemistry, Kuriakose Elias College, Mannanam, Kottayam, Kerala 686561,India
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Manasa M, Chandewar PR, Mahalingam H. Photocatalytic degradation of ciprofloxacin & norfloxacin and disinfection studies under solar light using boron & cerium doped TiO2 catalysts synthesized by green EDTA-citrate method. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.03.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Visible-Light-Driven Bio-Templated Magnetic Copper Oxide Composite for Heterogeneous Photo-Fenton Degradation of Tetracycline. WATER 2021. [DOI: 10.3390/w13141918] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The development of a visible-light-driven, reusable, and long-lasting catalyst for the heterogeneous photo-Fenton process is critical for practical application in the treatment of contaminated water. This study focuses on synthesizing a visible-light-driven heterogenous bio-templated magnetic copper oxide composite (Fe3O4/CuO/C) by a two-step process of bio-templating and hydrothermal processes. The prepared composite was characterized by field emission-scanning electron microscope (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), electrical impedance spectroscopy (EIS), and vibrating sample magnetometer (VSM). The results reveal that the prepared composite retains the template’s (corn stalk’s) original porous morphology, and a substantial amount of CuO and Fe3O4 particles are loaded onto the surface of the template. The prepared Fe3O4/CuO/C composite was employed as a catalyst for heterogeneous photo-Fenton degradation of tetracycline (TC) irradiated by visible light. The prepared Fe3O4/CuO/C catalyst has high efficiency towards TC degradation within 60 min across a wide pH range irradiated by visible light, which is attributed to its readily available interfacial boundaries, which significantly improves the movement of photoexcited electrons across various components of the prepared composite. The influence of other parameters such as initial H2O2 concentration, initial concentration of TC, and catalyst dosages was also studied. In addition to high efficiency, the prepared catalyst’s performance was sustained after five cycles, and its recovery is aided by the use of an external magnetic field. This research paper highlights the development of a heterogeneous catalyst for the elimination of refractory organic compounds in wastewater.
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Macías-Vargas JA, Campos-Mañas MC, Agüera A, Sánchez Pérez JA, Ramírez-Zamora RM. Enhanced activated persulfate oxidation of ciprofloxacin using a low-grade titanium ore under sunlight: influence of the irradiation source on its transformation products. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:24008-24022. [PMID: 33415630 DOI: 10.1007/s11356-020-11564-8] [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: 08/06/2020] [Accepted: 11/05/2020] [Indexed: 06/12/2023]
Abstract
In this work, the activated persulfate oxidation of ciprofloxacin (CIP) using a low-grade titanium ore under sunlight or simulated sunlight were conducted to analyze the CIP degradation efficiency and to identify the transformation products (TPs) generated during oxidation under both types of irradiation sources by using liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-QTOF-MS). All advance oxidation process experiments were performed in a 2700-mL raceway reactor at a pH value of ~ 6.5 and an initial CIP concentration of 1 mg/L, during 90 min of reaction time. The control experiments carried out under simulated sunlight achieved a 97.7 ± 0.6% degradation efficiency, using 385 W/m2 of irradiation with an average temperature increase of 11.7 ± 0.6 °C. While, the experiments under sunlight reached a 91.2 ± 1.3% degradation efficiency, under an average irradiation value of 19.2 ± 0.3 W/m2 in October-November 2019 at hours between 11:00 am and 3:00 pm with an average temperature increase of 1.4 ± 0.8 °C. Mass spectrometry results indicated that 14 of the 108 possible TPs reported in the literature were detected. The calculated exact mass, measured accurate mass, and its characteristic diagnostic fragment ions were listed, and two new TPs were tentative identified. The TP generation analysis showed that some specific compounds were detected in different time intervals with kinetic variations depending on the irradiation used. Consequently, two CIP degradation pathways were proposed, since the type of irradiation determines the CIP degradation mechanism. Graphical abstract.
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Affiliation(s)
- José-Alberto Macías-Vargas
- Instituto de Ingeniería, Universidad Nacional Autónoma de México (UNAM), Alcaldía Coyoacán, 04510, México City, Mexico
| | - Marina Celia Campos-Mañas
- Solar Energy Research Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Ctra. de Sacramento s/n, 04120, Almería, Spain
| | - Ana Agüera
- Solar Energy Research Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Ctra. de Sacramento s/n, 04120, Almería, Spain
| | - José Antonio Sánchez Pérez
- Solar Energy Research Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Ctra. de Sacramento s/n, 04120, Almería, Spain
| | - Rosa-María Ramírez-Zamora
- Instituto de Ingeniería, Universidad Nacional Autónoma de México (UNAM), Alcaldía Coyoacán, 04510, México City, Mexico.
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Núñez-Salas RE, Hernández-Ramírez A, Santos-Lozano V, Hinojosa-Reyes L, Guzmán-Mar JL, Gracia-Pinilla MÁ, Maya-Treviño MDL. Synthesis, characterization, and photocatalytic performance of FeTiO3/ZnO on ciprofloxacin degradation. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113186] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Review on the Visible Light Photocatalysis for the Decomposition of Ciprofloxacin, Norfloxacin, Tetracyclines, and Sulfonamides Antibiotics in Wastewater. Catalysts 2021. [DOI: 10.3390/catal11040437] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Antibiotics are chemical compounds that are used to kill or prevent bacterial growth. They are used in different fields, such as the medical field, agriculture, and veterinary. Antibiotics end up in wastewater, which causes the threat of developing antibacterial resistance; therefore, antibiotics must be eliminated from wastewater. Different conventional elimination methods are limited due to their high cost and effort, or incomplete elimination. Semiconductor-assisted photocatalysis arises as an effective elimination method for different organic wastes including antibiotics. A variety of semiconducting materials were tested to eliminate antibiotics from wastewater; nevertheless, research is still ongoing due to some limitations. This review summarizes the recent studies regarding semiconducting material modifications for antibiotic degradation using visible light irradiation.
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21
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Removal of Emerging Pollutants from Water Using Environmentally Friendly Processes: Photocatalysts Preparation, Characterization, Intermediates Identification and Toxicity Assessment. NANOMATERIALS 2021; 11:nano11010215. [PMID: 33467696 PMCID: PMC7829760 DOI: 10.3390/nano11010215] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 01/04/2021] [Accepted: 01/11/2021] [Indexed: 12/21/2022]
Abstract
Pharmaceuticals and pesticides are emerging contaminants problematic in the aquatic environment because of their adverse effects on aquatic life and humans. In order to remove them from water, photocatalysis is one of the most modern technologies to be used. First, newly synthesized photocatalysts were successfully prepared using a sol-gel method and characterized by different techniques (XRD, FTIR, UV/Vis, BET and SEM/EDX). The photocatalytic properties of TiO2, ZnO and MgO nanoparticles were examined according to their removal from water for two antibiotics (ciprofloxacin and ceftriaxone) and two herbicides (tembotrione and fluroxypyr) exposed to UV/simulated sunlight (SS). TiO2 proved to be the most efficient nanopowder under UV and SS. Addition of (NH4)2S2O8 led to the faster removal of both antibiotics and herbicide fluroxypyr. The main intermediates were separated and identified for the herbicides and antibiotic ciprofloxacin. Finally, the toxicity of each emerging pollutant mixture and formed intermediates was assessed on wheat germination and biomass production.
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Paulkumar K, Jesi Reeta T, Emmanuel Joshua Jebasingh S, Mangalanagasundari S, Muthu K, Murugan K. Potential utilization of zinc nanoparticles for wastewater treatment. AQUANANOTECHNOLOGY 2021:437-466. [DOI: 10.1016/b978-0-12-821141-0.00026-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
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23
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Designing Novel Photocatalysts for Disinfection of Multidrug-Resistant Waterborne Bacteria. NANOTECHNOLOGY FOR ENERGY AND ENVIRONMENTAL ENGINEERING 2020. [DOI: 10.1007/978-3-030-33774-2_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Ortiz-Bustos J, Gómez-Ruiz S, Mazarío J, Domine ME, del Hierro I, Pérez Y. Copper and sulphur co-doped titanium oxide nanoparticles with enhanced catalytic and photocatalytic properties. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01041c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Copper and sulphur co-doped titanium oxide nanoparticles have been prepared by the sol–gel method to develop versatile catalysts exhibiting enhanced catalytic and photocatalytic properties.
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Affiliation(s)
- Josefa Ortiz-Bustos
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Escuela Superior de Ciencias Experimentales y Tecnología
- Universidad Rey Juan Carlos
- Madrid
| | - Santiago Gómez-Ruiz
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Escuela Superior de Ciencias Experimentales y Tecnología
- Universidad Rey Juan Carlos
- Madrid
| | - Jaime Mazarío
- Instituto de Tecnología Química (UPV-CSIC)
- Universidad Politécnica de Valencia
- Consejo Superior de Investigaciones Científicas
- Spain
| | - Marcelo E. Domine
- Instituto de Tecnología Química (UPV-CSIC)
- Universidad Politécnica de Valencia
- Consejo Superior de Investigaciones Científicas
- Spain
| | - Isabel del Hierro
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Escuela Superior de Ciencias Experimentales y Tecnología
- Universidad Rey Juan Carlos
- Madrid
| | - Yolanda Pérez
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Escuela Superior de Ciencias Experimentales y Tecnología
- Universidad Rey Juan Carlos
- Madrid
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25
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Thi Thanh Nhi L, Van Thuan L, My Uyen D, Nguyen MH, Thu VT, Khieu DQ, Sinh LH. Facile fabrication of highly flexible and floatable Cu2O/rGO on Vietnamese traditional paper toward high-performance solar-light-driven photocatalytic degradation of ciprofloxacin antibiotic. RSC Adv 2020; 10:16330-16338. [PMID: 35498834 PMCID: PMC9052828 DOI: 10.1039/d0ra01854f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 04/08/2020] [Indexed: 11/21/2022] Open
Abstract
In this work, we successfully demonstrated the facile fabrication of highly flexible and floatable Cu2O/rGO on Vietnamese traditional paper (VTP) for the solar-light-driven photocatalytic degradation of the antibiotic ciprofloxacin. The catalyst membrane was prepared by the green reduction of both Cu(OH)2 to Cu2O nanoparticles and graphene oxide to reduced graphene oxide. VTP has a fibrous structure with tiny fibers connected like a spider web and multiple layers in the form of a multidimensional array, which functions as a flexible and highly porous supporter to the catalyst. Moreover, the microfibrillated cellulose of VTP acts as micro-capillaries to drag ciprofloxacin (CIP) close to the active sites on the Cu2O/rGO/VTP surface, which improves the adsorption capacity and photocatalytic efficiency of ciprofloxacin. The adsorption process is best described by the pseudo-first-order and Freundlich models. The maximum photodegradation of CIP by the catalyst is more than 80% attained after 1.5 h under solar light irradiation with a fixed CIP concentration of 10 mg L−1. The catalyst membrane exhibited good reusability of up to 5 cycles. In this work, we successfully demonstrated the facile fabrication of highly flexible and floatable Cu2O/rGO on Vietnamese traditional paper (VTP) for the solar-light-driven photocatalytic degradation of the antibiotic ciprofloxacin.![]()
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Affiliation(s)
- Le Thi Thanh Nhi
- Center for Advanced Chemistry
- Institute of Research and Development
- Duy Tan University
- Da Nang
- Vietnam
| | - Le Van Thuan
- Center for Advanced Chemistry
- Institute of Research and Development
- Duy Tan University
- Da Nang
- Vietnam
| | - Dao My Uyen
- Center for Advanced Chemistry
- Institute of Research and Development
- Duy Tan University
- Da Nang
- Vietnam
| | - Minh Hiep Nguyen
- Center of Radiation Technology and Biotechnology
- Nuclear Research Institute
- Dalat
- Vietnam
| | - Vu Thi Thu
- University of Science and Technology of Hanoi (USTH)
- Vietnam Academy of Science and Technology (VAST)
- Cau Giay
- Vietnam
| | | | - Le Hoang Sinh
- Center for Advanced Chemistry
- Institute of Research and Development
- Duy Tan University
- Da Nang
- Vietnam
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Wool roving textured reduced graphene oxide-HoVO4-ZnO nanocomposite for photocatalytic and supercapacitor performance. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.135062] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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27
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Antimicrobials and Antimicrobial Resistance in the Environment and Its Remediation: A Global One Health Perspective. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16234614. [PMID: 31757109 PMCID: PMC6926838 DOI: 10.3390/ijerph16234614] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 10/31/2019] [Indexed: 01/22/2023]
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Tama AM, Das S, Dutta S, Bhuyan MDI, Islam MN, Basith MA. MoS2 nanosheet incorporated α-Fe2O3/ZnO nanocomposite with enhanced photocatalytic dye degradation and hydrogen production ability. RSC Adv 2019; 9:40357-40367. [PMID: 35542683 PMCID: PMC9076241 DOI: 10.1039/c9ra07526g] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 11/26/2019] [Indexed: 11/24/2022] Open
Abstract
We have synthesized MoS2 incorporated α-Fe2O3/ZnO nanocomposites by adapting a facile hydrothermal synthesis process. The effect of incorporating ultrasonically exfoliated few-layer MoS2 nanosheets on the solar-light driven photocatalytic performance of α-Fe2O3/ZnO photocatalyst nanocomposites has been demonstrated. Structural, morphological and optical characteristics of the as-synthesized nanomaterials are comprehensively investigated and analyzed by performing Rietveld refinement of powder X-ray diffraction patterns, field emission scanning electron microscopy and UV-visible spectroscopy, respectively. The photoluminescence spectra of the as-prepared nanocomposites elucidate that the recombination of photogenerated electron–hole pairs is highly suppressed due to incorporation of MoS2 nanosheets. Notably, the ultrasonicated MoS2 incorporated α-Fe2O3/ZnO nanocomposite manifests 91% and 83% efficiency in degradation of rhodamine B dye and antibiotic ciprofloxacin respectively under solar illumination. Active species trapping experiments reveal that the hydroxyl (˙OH) radicals play a significant role in RhB degradation. Likewise the dye degradation efficiency, the amount of hydrogen produced by this nanocomposite via photocatalytic water splitting is also considerably higher as compared to both non-ultrasonicated MoS2 incorporated α-Fe2O3/ZnO and α-Fe2O3/ZnO nanocomposites as well as Degussa P25 titania nanoparticles. This indicates the promising potential of the incorporation of ultrasonicated MoS2 with α-Fe2O3/ZnO nanocomposites for the generation of carbon-free hydrogen by water splitting. The substantial increase in the photocatalytic efficiency of α-Fe2O3/ZnO after incorporation of ultrasonicated MoS2 can be attributed to its favorable band structure, large surface to volume ratio, effective segregation and migration of photogenerated electron–hole pairs at the interface of heterojunctions and the plethora of exposed active edge sites provided by the few-layer MoS2 nanosheets. Novel few-layer MoS2 nanosheets incorporated α-Fe2O3/ZnO photocatalyst nanocomposite is reported with high dye degradation and hydrogen evolution ability under solar illumination.![]()
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Affiliation(s)
- Angkita Mistry Tama
- Nanotechnology Research Laboratory
- Department of Physics
- Bangladesh University of Engineering and Technology
- Dhaka-1000
- Bangladesh
| | - Subrata Das
- Nanotechnology Research Laboratory
- Department of Physics
- Bangladesh University of Engineering and Technology
- Dhaka-1000
- Bangladesh
| | - Sagar Dutta
- Nanotechnology Research Laboratory
- Department of Physics
- Bangladesh University of Engineering and Technology
- Dhaka-1000
- Bangladesh
| | - M. D. I. Bhuyan
- Nanotechnology Research Laboratory
- Department of Physics
- Bangladesh University of Engineering and Technology
- Dhaka-1000
- Bangladesh
| | - M. N. Islam
- Department of Chemistry
- Bangladesh University of Engineering and Technology
- Dhaka-1000
- Bangladesh
| | - M. A. Basith
- Nanotechnology Research Laboratory
- Department of Physics
- Bangladesh University of Engineering and Technology
- Dhaka-1000
- Bangladesh
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