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Hossain MK, Hossain MM, Akhtar S. Studies on Synthesis, Characterization, and Photocatalytic Activity of TiO 2 and Cr-Doped TiO 2 for the Degradation of p-Chlorophenol. ACS OMEGA 2023; 8:1979-1988. [PMID: 36687086 PMCID: PMC9850748 DOI: 10.1021/acsomega.2c05107] [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: 08/09/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
TiO2 and Cr-TiO2 nanoparticles (NPs) have been synthesized by the sol-gel method using titanium isopropoxide as the precursor of Titania. The prepared samples were analyzed by employing scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared analyses. Under UV irradiation, the photocatalytic activities of TiO2 and Cr-TiO2 were observed by estimating the % degradation of p-chlorophenol (PCP) as a sample pollutant. The extent of degradation was investigated, varying the catalyst dosage, initial PCP concentration, irradiation time, and solution pH. The experimental results show that efficiency of catalysts initially increases but decreases later on, whereas the % degradation of PCP is the highest at its lowest initial concentration. For TiO2 and Cr-TiO2 NPs at their optimal catalyst dosage of 2.0 g/L, acidic pH, and with UV irradiation for 90 min, the observed % degradation of PCP is 50.23 ± 3.12 and 66.51 ± 2.14%, respectively. Thus, the prepared Cr-TiO2 NPs have enhanced the degradation efficiency of PCP with an irradiation time which is four time less than those reported earlier. From the kinetics analysis, the degradation reaction of PCP is found to follow a pseudo-first-order model and the rate constants are 0.0075 and 0.0122 min-1 for pure TiO2 and Cr-TiO2 NPs, respectively. The present study has further revealed that owing to the lower rate of electron-hole pair recombination, the photocatalytic activity of Cr-TiO2 NPs becomes higher than that of TiO2. Therefore, as viable photocatalytic agents, Cr-TiO2 NPs are suggested to be used also for efficient degradation of other organic pollutants.
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Affiliation(s)
- Md. Kamrul Hossain
- Department
of Chemistry, University of Chittagong, Chittagong4331, Bangladesh
| | | | - Shamim Akhtar
- Department
of Chemistry, University of Chittagong, Chittagong4331, Bangladesh
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2
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Bathe AS, Sanz Arjona A, Regan A, Wallace C, Nerney CR, O'Donoghue N, Crosland JM, Simonian T, Walton RI, Dunne PW. Solvothermal synthesis of soluble, surface modified anatase and transition metal doped anatase hybrid nanocrystals. NANOSCALE ADVANCES 2022; 4:5343-5354. [PMID: 36540114 PMCID: PMC9724697 DOI: 10.1039/d2na00640e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Accepted: 11/03/2022] [Indexed: 06/17/2023]
Abstract
Titanium dioxide, or titania, is perhaps the most well-known and widely studied photocatalytic material, with myriad applications, due to a high degree of tunability achievable through the incorporation of dopants and control of phase composition and particle size. Many of the applications of titanium dioxide require particular forms, such as gels, coatings, or thin films, making the development of hybrid solution processable nanoparticles increasingly attractive. Here we report a simple solvothermal route to highly dispersible anatase phase titanium dioxide hybrid nanoparticles from amorphous titania. Solvothermal treatment of the amorphous titania in trifluoroacetic acid leads to the formation of anatase phase nanoparticles with a high degree of size control and near complete surface functionalisation. This renders the particles highly dispersible in simple organic solvents such as acetone. Dopant ions may be readily incorporated into the amorphous precursor by co-precipitation, with no adverse effect on subsequent crystallisation and surface modification.
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Affiliation(s)
- A S Bathe
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - A Sanz Arjona
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - A Regan
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
- CDT ACM, AMBER, Trinity College Dublin, College Green Dublin 2 Ireland
| | - C Wallace
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - C R Nerney
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - N O'Donoghue
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
| | - J M Crosland
- School of Chemistry, University of Warwick Gibbet Hill Coventry CV4 7AL UK
| | - T Simonian
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
- CDT ACM, AMBER, Trinity College Dublin, College Green Dublin 2 Ireland
| | - R I Walton
- School of Chemistry, University of Warwick Gibbet Hill Coventry CV4 7AL UK
| | - P W Dunne
- School of Chemistry, Trinity College Dublin, College Green Dublin 2 Ireland
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3
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Guo K, Tao Y, Liu Y, Lyu Y, Pan Z. One-Stage Hydrothermal Growth and Characterization of Epitaxial LaMnO 3 Films on SrTiO 3 Substrate. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5928. [PMID: 36079310 PMCID: PMC9457439 DOI: 10.3390/ma15175928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/21/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
Epitaxial LaMnO3 thin films were grown on SrTiO3 substrate using a one-stage hydrothermal route from La(NO3)3, MnCl2 and KMnO4 in an aqueous solution of 10 M KOH at 340 °C. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) indicate full coverage of LaMnO3 on the substrate. X-ray diffraction in the symmetric ω/2θ mode suggests the film has an out-of-plane preferred orientation along the [001] direction of the substrate. The LaMnO3 epitaxial thin film growth mechanism is proposed based on the analysis of the atomic sharp interface formed between LaMnO3 and the SrTiO3 substrate, as seen by aberration-corrected scanning transmission electron microscopy (AC-STEM) imaging in combination with electronic energy loss spectroscopy (EELS). Compared with the conventional vapor deposition methods, the one-stage hydrothermal route opens up a new way to fabricate complex oxide epitaxial heterostructures.
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4
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Moreno EKG, Garcia LF, Lobón GS, Brito LB, Oliveira GAR, Luque R, de Souza Gil E. Ecotoxicological assessment and electrochemical remediation of doxorubicin. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 179:143-150. [PMID: 31035248 DOI: 10.1016/j.ecoenv.2019.04.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/10/2019] [Accepted: 04/16/2019] [Indexed: 06/09/2023]
Abstract
Doxorubicin (DOX) is an anthracycline widely used in treatments of several cancers, so it has found in hospital effluents with a significant concentration (above 1 μg L-1). Electrochemical remediation is an alternative to promote its degradation. The aim of this work was to evaluate the ability of nanostructured graphite electrodes with metallic oxides to degrade DOX by electro-oxidation (EO). Graphite, TiO2@graphite and AuO-TiO2@graphite electrodes were used in medium with tap water or 10 mmol L-1 NaCl. DOX treatments at concentrations of 1.25-5 mg L-1 were carried out in a voltage source with 1.5-5 V. The cathode used was the platinum electrode. The treatment of DOX 1.25 mg L-1 with 10 mmol L-1 NaCl electrolyte using the AuO-TiO2@graphite electrode at 5 V and 1 mA was the best methodology to promote its degradation. Also, the modified electrode was efficient to DOX degradation after 17 cycles of reuse. An energy expenditure of 1.11 and 0.2 kWh m-3 were obtained for 3 and 50 mL of treatment, respectively. Fish embryo acute toxicity test with zebrafish (Danio rerio) were performed before and after treatment by EO using NaCl. This treatment caused no effect on embryo-larval development, however it induced significant damage in the DNA of the zebrafish larvae after 96 h of exposure, which emphasizes the importance of a depth ecotoxicological evaluation during the development of EO methodologies.
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Affiliation(s)
| | | | - Germán Sanz Lobón
- Institute of Chemistry, Federal University of Goias, Goiânia, 74001-970, Brazil.
| | - Lara Barroso Brito
- Faculty of Pharmacy, Federal University of Goias, Goiânia, 74605-170, Brazil.
| | - Gisele Augusto Rodrigues Oliveira
- Faculty of Pharmacy, Federal University of Goias, Goiânia, 74605-170, Brazil; National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), UNESP, Institute of Chemistry, P.O. Box 355, 14800-900, Araraquara, SP, Brazil.
| | - Rafael Luque
- Department of Organic Chemistry, University of Cordoba, Ctra Nnal IV-A, Km 396, E14014, Cordoba, Spain; Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, Moscow, 117198, Russia.
| | - Eric de Souza Gil
- Faculty of Pharmacy, Federal University of Goias, Goiânia, 74605-170, Brazil.
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5
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Insights into the Role of Plasma in Atmospheric Pressure Chemical Vapor Deposition of Titanium Dioxide Thin Films. Sci Rep 2018; 8:16684. [PMID: 30420716 PMCID: PMC6232178 DOI: 10.1038/s41598-018-35154-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 10/31/2018] [Indexed: 11/24/2022] Open
Abstract
In this work, the effect of plasma on the chemistry and morphology of coatings deposited by Atmospheric Pressure Plasma Enhanced Chemical Vapor Deposition (AP-PECVD) is investigated. To do so, plasma deposited amorphous titanium dioxide (TiO2) thin films are compared to thin films deposited using Atmospheric Pressure Chemical Vapor Deposition (AP-CVD) not involving the use of plasma. We focus here on the effect and the interest of plasma in the AP-PECVD process over AP-CVD for low substrate temperature deposition. The advantages of AP-PECVD over AP-CVD are often suggested in many articles however no direct evidence of the role of the plasma for TiO2 deposition at atmospheric pressure was reported. Hence, herein, the deposition via both methods is directly compared by depositing coatings with and without plasma using the same CVD reactor. Through the control of the plasma parameters, we are able to form low carbon coatings at low temperature with a deposition rate twice faster than AP-CVD, clearly showing the interest of plasma. Plasma enhanced methods are promising for the deposition of coatings at industrial scale over large surface and at high rate.
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Baba K, Bulou S, Choquet P, Boscher ND. Photocatalytic Anatase TiO 2 Thin Films on Polymer Optical Fiber Using Atmospheric-Pressure Plasma. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13733-13741. [PMID: 28361531 DOI: 10.1021/acsami.7b01398] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Due to the undeniable industrial advantages of low-temperature atmospheric-pressure plasma processes, such as low cost, low temperature, easy implementation, and in-line process capabilities, they have become the most promising next-generation candidate system for replacing thermal chemical vapor deposition or wet chemical processes for the deposition of functional coatings. In the work detailed in this article, photocatalytic anatase TiO2 thin films were deposited at a low temperature on polymer optical fibers using an atmospheric-pressure plasma process. This method overcomes the challenge of forming crystalline transition metal oxide coatings on polymer substrates by using a dry and up-scalable method. The careful selection of the plasma source and the titanium precursor, i.e., titanium ethoxide with a short alkoxy group, allowed the deposition of well-adherent, dense, and crystalline TiO2 coatings at low substrate temperature. Raman and XRD investigations showed that the addition of oxygen to the precursor's carrier gas resulted in a further increase of the film's crystallinity. Furthermore, the films deposited in the presence of oxygen exhibited a better photocatalytic activity toward methylene blue degradation assumedly due to their higher amount of photoactive {101} facets.
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Affiliation(s)
- Kamal Baba
- Luxembourg Institute of Science and Technology , Materials Research and Technology Department, L-4362 Esch-sur-Alzette, Luxembourg
| | - Simon Bulou
- Luxembourg Institute of Science and Technology , Materials Research and Technology Department, L-4362 Esch-sur-Alzette, Luxembourg
| | - Patrick Choquet
- Luxembourg Institute of Science and Technology , Materials Research and Technology Department, L-4362 Esch-sur-Alzette, Luxembourg
| | - Nicolas D Boscher
- Luxembourg Institute of Science and Technology , Materials Research and Technology Department, L-4362 Esch-sur-Alzette, Luxembourg
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8
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Wee LH, Meledina M, Turner S, Custers K, Kerkhofs S, Sree SP, Gobechiya E, Kirschhock CEA, Van Tendeloo G, Martens JA. Anatase TiO2 nanoparticle coating on porous COK-12 platelets as highly active and reusable photocatalysts. RSC Adv 2016. [DOI: 10.1039/c6ra06141a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Coating of anatase TiO2 nanoparticles on ordered mesoporous silica COK-12 platelets for effective photodegradation of various organic pollutants under UV light irradiation.
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Affiliation(s)
- L. H. Wee
- Centre for Surface Chemistry and Catalysis
- KU Leuven
- Leuven
- Belgium
| | - M. Meledina
- Electron Microscopy for Materials Science
- University of Antwerp
- Antwerp
- Belgium
| | - S. Turner
- Electron Microscopy for Materials Science
- University of Antwerp
- Antwerp
- Belgium
| | - K. Custers
- Centre for Surface Chemistry and Catalysis
- KU Leuven
- Leuven
- Belgium
| | - S. Kerkhofs
- Centre for Surface Chemistry and Catalysis
- KU Leuven
- Leuven
- Belgium
| | - S. P. Sree
- Centre for Surface Chemistry and Catalysis
- KU Leuven
- Leuven
- Belgium
| | - E. Gobechiya
- Centre for Surface Chemistry and Catalysis
- KU Leuven
- Leuven
- Belgium
| | | | - G. Van Tendeloo
- Electron Microscopy for Materials Science
- University of Antwerp
- Antwerp
- Belgium
| | - J. A. Martens
- Centre for Surface Chemistry and Catalysis
- KU Leuven
- Leuven
- Belgium
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9
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Gomez V, Bear JC, McNaughter PD, McGettrick JD, Watson T, Charbonneau C, O'Brien P, Barron AR, Dunnill CW. Bi-phasic titanium dioxide nanoparticles doped with nitrogen and neodymium for enhanced photocatalysis. NANOSCALE 2015; 7:17735-17744. [PMID: 26455738 DOI: 10.1039/c5nr06025g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Bi-phasic or multi-phasic composite nanoparticles for use in photocatalysis have been produced by a new synthetic approach. Sol-gel methods are used to deposit multiple layers of active material onto soluble substrates. In this work, a layer of rutile (TiO2) was deposited onto sodium chloride pellets followed by an annealing step and a layer of anatase. After dissolving the substrate, bi-phasic nanoparticles containing half anatase and half rutile TiO2; with "Janus-like" characteristics are obtained. Nitrogen and neodymium doping of the materials were observed to enhance the photocatalytic properties both under UV and white light irradiation. The unique advantage of this synthetic method is the ability to systematically dope separate sides of the nanoparticles. Nitrogen doping was found to be most effective on the anatase side of the nanoparticle while neodymium was found to be most effective on the rutile side. Rhodamine B dye was effectively photodegraded by co-doped particles under white light.
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Affiliation(s)
- Virginia Gomez
- Energy Safety Research Institute (ESRI), College of Engineering, Swansea University, Bay Campus, Fabian Way Swansea, SA1 8EN, UK.
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10
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Cold-Setting Inkjet Printed Titania Patterns Reinforced by Organosilicate Binder. Molecules 2015; 20:16582-603. [PMID: 26378515 PMCID: PMC6332201 DOI: 10.3390/molecules200916582] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 08/20/2015] [Accepted: 08/24/2015] [Indexed: 12/02/2022] Open
Abstract
A hybrid organo-silica sol was used as a binder for reinforcing of commercial titanium dioxide nanoparticles (Evonic P25) deposited on glass substrates. The organo-silica binder was prepared by the sol-gel process and mixtures of titania nanoparticles with the binder in various ratios were deposited by materials printing technique. Patterns with both positive and negative features down to 100 µm size and variable thickness were reliably printed by Fujifilm Dimatix inkjet printer. All prepared films well adhered onto substrates, however further post-printing treatment proved to be necessary in order to improve their reactivity. The influence of UV radiation as well as of thermal sintering on the final electrochemical and photocatalytic properties was investigated. A mixture containing 63 wt % of titania delivered a balanced compromise of mechanical stability, generated photocurrent density and photocatalytic activity. Although the heat treated samples yielded generally higher photocurrent, higher photocatalytic activity towards model aqueous pollutant was observed in the case of UV cured samples because of their superhydrophilic properties. While heat sintering remains the superior processing method for inorganic substrates, UV-curing provides a sound treatment option for heat sensitive ones.
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11
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Ehsan MA, Khaledi H, Pandikumar A, Rameshkumar P, Huang NM, Arifin Z, Mazhar M. Nitrite ion sensing properties of ZnTiO3–TiO2 composite thin films deposited from a zinc–titanium molecular complex. NEW J CHEM 2015. [DOI: 10.1039/c5nj00850f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ZnTiO3–TiO2 composite thin film electrode has been fabricated by AACVD method and tested for electrochemical nitrite ion detection.
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Affiliation(s)
- Muhammad Ali Ehsan
- Nanotechnology and Catalysis Center (NANOCAT), University of Malaya
- 50603-Kuala Lumpur
- Malaysia
| | - Hamid Khaledi
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603-Kuala Lumpur
- Malaysia
| | - Alagarsamy Pandikumar
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603-Kuala Lumpur
- Malaysia
| | - Perumal Rameshkumar
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603-Kuala Lumpur
- Malaysia
| | - Nay Ming Huang
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603-Kuala Lumpur
- Malaysia
| | - Zainudin Arifin
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603-Kuala Lumpur
- Malaysia
| | - Muhammad Mazhar
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603-Kuala Lumpur
- Malaysia
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12
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Bansode AS, More S, Bhoraskar SV, Mathe VL. Reusable thin film photocatalyst of Fe-doped TiO 2deposited by ECR plasma. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Supriya More
- Department of Physics; University of Pune; Pune 411007 India
| | - S. V. Bhoraskar
- Department of Physics; University of Pune; Pune 411007 India
| | - V. L. Mathe
- Department of Physics; University of Pune; Pune 411007 India
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13
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Powell MJ, Dunnill CW, Parkin IP. N-doped TiO2 visible light photocatalyst films via a sol–gel route using TMEDA as the nitrogen source. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.03.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Diesen V, Dunnill CW, Bear JC, Firth S, Jonsson M, Parkin IP. Visible Light Photocatalytic Activity in AACVD-Prepared N-modified TiO2Thin Films. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/cvde.201307086] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Veronica Diesen
- Materials Chemistry Research Centre, Department of Chemistry; University College London 20; Gordon Street London WC1H 0AJ (United Kingdom)
- School of Chemical Science and Engineering, Applied Physical Chemistry; KTH Royal Institute of Technology; SE-100 44 Stockholm (Sweden)
| | - Charles W. Dunnill
- Materials Chemistry Research Centre, Department of Chemistry; University College London 20; Gordon Street London WC1H 0AJ (United Kingdom)
| | - Joseph C. Bear
- Materials Chemistry Research Centre, Department of Chemistry; University College London 20; Gordon Street London WC1H 0AJ (United Kingdom)
| | - Steve Firth
- Materials Chemistry Research Centre, Department of Chemistry; University College London 20; Gordon Street London WC1H 0AJ (United Kingdom)
| | - Mats Jonsson
- School of Chemical Science and Engineering, Applied Physical Chemistry; KTH Royal Institute of Technology; SE-100 44 Stockholm (Sweden)
| | - Ivan P. Parkin
- Materials Chemistry Research Centre, Department of Chemistry; University College London 20; Gordon Street London WC1H 0AJ (United Kingdom)
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15
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Diesen V, Dunnill CW, Österberg E, Parkin IP, Jonsson M. Silver enhanced TiO2thin films: photocatalytic characterization using aqueous solutions of tris(hydroxymethyl)aminomethane. Dalton Trans 2014; 43:344-51. [DOI: 10.1039/c3dt52270a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Seisenbaeva GA, Daniel G, Nedelec JM, Kessler VG. Solution equilibrium behind the room-temperature synthesis of nanocrystalline titanium dioxide. NANOSCALE 2013; 5:3330-3336. [PMID: 23467564 DOI: 10.1039/c3nr34068f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Formation of nanocrystalline and monodisperse TiO2 from a water soluble and stable precursor, ammonium oxo-lactato-titanate, (NH4)8Ti4O4(Lactate)8·4H2O, often referred to as TiBALDH or TALH, is demonstrated to be due to a coordination equilibrium. This compound, individual in the solid state, exists in solution in equilibrium with ammonium tris-lactato-titanate, (NH4)2Ti(Lactate)3 and uniform crystalline TiO2 nanoparticles (anatase) stabilized by surface-capping with lactate ligands. This equilibrium can be shifted towards nano-TiO2via application of a less polar solvent like methanol or ethanol, dilution of the solution, introduction of salts or raising the temperature, and reverted on addition of polar and strongly solvating media such as dimethyl sulfoxide, according to NMR. Aggregation and precipitation of the particles were followed by DLS and could be achieved by a decrease in their surface charge by adsorption of strongly hydrogen-bonding cations, e.g. in solutions of ammonia, ethanolamine or amino acid arginine or by addition of ethanol. The observed equilibrium may be involved in formation of nano-titania on the surface of plant roots exerting chelating organic carboxylate ligands and thus potentially influencing plant interactions.
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Affiliation(s)
- Gulaim A Seisenbaeva
- Department of Chemistry, Biocenter, Swedish University of Agricultural Sciences (SLU), Box 7015, SE-75007, Uppsala, Sweden.
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17
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Daghrir R, Drogui P, Robert D. Modified TiO2 For Environmental Photocatalytic Applications: A Review. Ind Eng Chem Res 2013. [DOI: 10.1021/ie303468t] [Citation(s) in RCA: 1129] [Impact Index Per Article: 102.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Rimeh Daghrir
- Institut National de la Recherche
Scientifique (INRS-ETE), Université du Québec, 490 rue de la Couronne, Quebec City, Quebec, Canada G1K 9A9
| | - Patrick Drogui
- Institut National de la Recherche
Scientifique (INRS-ETE), Université du Québec, 490 rue de la Couronne, Quebec City, Quebec, Canada G1K 9A9
| | - Didier Robert
- Antenne de Saint-Avold du Laboratoire
des Matériaux, Surfaces et Procédés pour la Catalyse
(LMSPC) CNRS-UMR7515, Université de Lorraine, 12 rue Victor Demange 57500 Saint-Avold, France
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