1
|
Malekkiani M, Ravari F, Heshmati Jannat Magham A, Dadmehr M, Groiss H, Hosseini HA, Sharif R. Fabrication of Graphene-Based TiO 2@CeO 2 and CeO 2@TiO 2 Core-Shell Heterostructures for Enhanced Photocatalytic Activity and Cytotoxicity. ACS OMEGA 2022; 7:30601-30621. [PMID: 36061736 PMCID: PMC9435054 DOI: 10.1021/acsomega.2c04338] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Accepted: 08/04/2022] [Indexed: 06/15/2023]
Abstract
Development of light-harvesting properties and inhibition of photogenerated charge carrier recombination are of paramount significance in the photocatalytic process. In the present work, we described the synthesis of core-shell heterostructures, which are composed of titanium oxide (TiO2) and cerium oxide (CeO2) deposited on a reduced graphene oxide (rGO) surface as a conductive substrate. Following the synthesis of ternary rGO-CeO2@TiO2 and rGO-TiO2@CeO2 nanostructures, their photocatalytic activity was investigated toward the degradation of rhodamine B dye as an organic pollutant under UV light irradiation. The obtained structures were characterized with high-resolution transmission electron microscopy, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, Brunauer-Emmett-Teller, X-ray photoelectron spectroscopy surface analysis, and UV-Vis spectroscopy. Various parameters including pH, catalyst dosage, temperature, and contact time were studied for photocatalysis optimization. Heterostructures showed considerable advantages because of their high surface area and superior photocatalytic performance. In contrast, rGO-CeO2@TiO2 showed the highest photocatalytic activity, which is attributed to the more effective electron-hole separation and quick suppression of charge recombination at core-shell phases. A biological assay of the prepared heterostructure was performed to determine the cytotoxicity against breast cancer cells (MCF-7) and demonstrated a very low survival rate at 7.65% of cells at the 17.5 mg mL-1 concentration of applied photocatalyst.
Collapse
Affiliation(s)
- Mitra Malekkiani
- Department
of Chemistry, Payame Noor University, Tehran 193954697, Iran
| | - Fatemeh Ravari
- Department
of Chemistry, Payame Noor University, Tehran 193954697, Iran
| | | | - Mehdi Dadmehr
- Department
of Biology, Payame Noor University, Tehran 193954697, Iran
| | - Heiko Groiss
- Christian
Doppler Laboratory for Nanoscale Phase Transformations, Center for
Surface and Nanoanalytics, Johannes Kepler
University Linz, Altenberger Straße 69, Linz 4040, Austria
| | | | - Reza Sharif
- Christian
Doppler Laboratory for Nanoscale Phase Transformations, Center for
Surface and Nanoanalytics, Johannes Kepler
University Linz, Altenberger Straße 69, Linz 4040, Austria
| |
Collapse
|
2
|
Simon SM, George G, Chandran A, Valparambil P, Shamsudeen S, Saritha AC, Biju PR, Thomas S, Joseph C, Vishwambharan UN. Robust polymer incorporated
TiO
2
‐ZrO
2
microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities. J Appl Polym Sci 2021. [DOI: 10.1002/app.50880] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Sanu Mathew Simon
- School of Pure and Applied Physics Mahatma Gandhi University Kottayam India
| | - Gejo George
- School of Pure and Applied Physics Mahatma Gandhi University Kottayam India
| | | | | | - Sajna Shamsudeen
- School of Pure and Applied Physics Mahatma Gandhi University Kottayam India
- Department of Optoelectronics University of Kerala Trivandrum India
| | - A. C. Saritha
- School of Pure and Applied Physics Mahatma Gandhi University Kottayam India
| | - P. R. Biju
- School of Pure and Applied Physics Mahatma Gandhi University Kottayam India
| | - Sabu Thomas
- School of Chemical Sciences Mahatma Gandhi University Kottayam India
- International and Inter University Centre for Nanoscience and Nanotechnology (IIUCNN) Mahatma Gandhi University Kottayam India
| | - Cyriac Joseph
- School of Pure and Applied Physics Mahatma Gandhi University Kottayam India
| | | |
Collapse
|
3
|
Preparation and Characterization of Ni/ZrTiAlOx Catalyst via Sol-Gel and Impregnation Methods for Low Temperature Dry Reforming of Methane. Catalysts 2020. [DOI: 10.3390/catal10111335] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Recently, the dry reforming of methane (DRM) has received much attention as a conversion technology of greenhouse gases. Ni-based catalysts supported on ternary metal oxide composite (ZrTiAlOx) were prepared to improve the coke resistance properties in the DRM (CH4:CO2 = 1) at low temperature. The ZrTiAlOx supports with different ratios of Zr/Ti were prepared through the modified Pechini sol-gel method, and then the Ni was impregnated on the synthesized support via the incipient wetness impregnation method. Considering the Zr/Ti ratios, different catalytic activity and durability in the DRM were identified. The Ni/ZrTiAlOx catalyst with Zr/Ti of 2 exhibited enhanced coke inhibition property compared to the others at low temperature DRM for 50 h. The catalysts with a high Zr/Ti ratio under the same condition were rapidly deactivated, while the catalyst with a low Zr/Ti ratio showed deficient activity. It was found from temperature-programmed surface reactions (TPSR) and DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy) analysis that the addition of Ti has led in to higher catalytic stability at Zr/Ti = 2, which could be as a result of oxygen vacancies generated by the ternary metal oxides. Ni/ZrTiAlOx catalyst with ratio of Zr/Ti = 2 showed high stability and good catalytic activity towards DRM for the production of syngas.
Collapse
|
4
|
Okhlopkova LB, Kerzhentsev MA, Ismagilov ZR. Development, Synthesis, and Study of Nanomaterials of Titania Doped by Zirconium for Selective Hydrogenation of 2-Methyl-3-Butyn-2-ol in a Microcapillary Reactor. KINETICS AND CATALYSIS 2019. [DOI: 10.1134/s0023158419040116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
5
|
Mbiri A, Wittstock G, Taffa DH, Gatebe E, Baya J, Wark M. Photocatalytic degradation of the herbicide chloridazon on mesoporous titania/zirconia nanopowders. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:34873-34883. [PMID: 29264852 DOI: 10.1007/s11356-017-1023-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 12/11/2017] [Indexed: 06/07/2023]
Abstract
Advanced oxidation processes using semiconducting photocatalysts for the degradation of organic pollutants are a promising approach for the remediation of pesticide-contaminated wastewater. High photodegradation efficiency and stability of the photocatalyst are of key importance for practical application of the semiconductor. In this study, mesoporous TiO2/ZrO2 nanopowders were synthesized via two techniques; evaporation-induced self-assembly (EISA) and sol-gel using triblock copolymers Pluronic P123 and F127. The photodegradation activities of the composites were determined by employing the herbicide chloridazon as a model compound. Due to well-developed mesoporosity, the TiO2/ZrO2 nanocomposite synthesized by EISA displays high surface area and small crystallite sizes leading to higher photocatalytic activity than pristine TiO2 prepared under similar condition and commercial Degussa P25 nanopowder. The optimum amount of zirconium required for the highest activities was identified and found to be 0.14 and 0.05 mol% for the EISA and sol-gel-prepared samples, respectively. Systematic studies of the post-thermal treatment step for both samples show that Zr inhibits an anatase-to-rutile phase transition only up to 600 °C, at higher temperature phase separation occurs. Samples synthesized by EISA method showed enhanced degradation activity than sol-gel-synthesized samples.
Collapse
Affiliation(s)
- Anne Mbiri
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129, Oldenburg, Germany
- Pure and applied Sciences, Technical University of Mombasa, 90420, Mombasa, 80100, Kenya
| | - Gunther Wittstock
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129, Oldenburg, Germany
| | - Dereje H Taffa
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129, Oldenburg, Germany.
| | - Erastus Gatebe
- Department of Chemistry, Jomo Kenyatta University of Agriculture and Technology, 62000, Nairobi, 00200, Kenya
| | - Joseph Baya
- Pure and applied Sciences, Technical University of Mombasa, 90420, Mombasa, 80100, Kenya
| | - Michael Wark
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129, Oldenburg, Germany
| |
Collapse
|
6
|
Kubiak A, Siwińska-Ciesielczyk K, Jesionowski T. Titania-Based Hybrid Materials with ZnO, ZrO₂ and MoS₂: A Review. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E2295. [PMID: 30445797 PMCID: PMC6266070 DOI: 10.3390/ma11112295] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 11/07/2018] [Accepted: 11/12/2018] [Indexed: 12/17/2022]
Abstract
Titania has properties that enable it to be used in a variety of applications, including self-cleaning surfaces, air and water purification systems, hydrogen evolution, and photoelectrochemical conversion. In order to improve the properties of titanium dioxide, modifications are made to obtain oxide/hybrid systems that are intended to have the properties of both components. In particular, zinc oxide, zirconia and molybdenum disulfide have been proposed as the second component of binary systems due to their antibacterial, electrochemical and photocatalytic properties. This paper presents a review of the current state of knowledge on the synthesis and practical utility of TiO₂-ZnO and TiO₂-ZrO₂ oxide systems and TiO₂-MoS₂ hybrid materials. The first part focuses on the hydrothermal method; then a review is made of the literature on the synthesis of the aforementioned materials using the sol-gel method. In the last section, the literature on the electrospinning method of synthesis is reviewed. The most significant physico-chemical, structural and dispersive-morphological properties of binary hybrid systems based on TiO₂ are described. A key aim of this review is to indicate the properties of TiO₂-ZnO, TiO₂-ZrO₂ and TiO₂-MoS₂ hybrid systems that have the greatest importance for practical applications. The variety of utilities of titania-based hybrid materials is emphasized.
Collapse
Affiliation(s)
- Adam Kubiak
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland.
| | - Katarzyna Siwińska-Ciesielczyk
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland.
| | - Teofil Jesionowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland.
| |
Collapse
|
7
|
Demircivi P, Simsek EB. Fabrication of Zr-doped TiO 2/chitosan composite catalysts with enhanced visible-light-mediated photoactivity for the degradation of Orange II dye. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 78:487-495. [PMID: 30207990 DOI: 10.2166/wst.2018.298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Zirconium/titanium/chitosan (Zr/Ti/CHT) composite catalysts were synthesized by sol-gel method using different chitosan amounts (5-20 wt.%) and their activity in the photocatalytic degradation of Orange II dye was evaluated for the first time. The results were compared with Zr/Ti, Zr/CHT and Ti/CHT catalysts. The composite catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy analysis. XRD analysis revealed that the Zr/Ti/CHT composite catalyst showed high crystallinity of anatase TiO2 phase. Photocatalytic experiments showed that adding CHT into the catalyst structure increased the photocatalytic degradation under visible light irradiation. Also, the first-order reaction rate constant, kapp, was calculated using the Langmuir-Hinshelwood (L-H) equation. The kapp values were found to be 0.009, 0.0013, 0.012 and 0.014 min-1 for Zr/Ti, Zr/CHT, Ti/CHT and Zr/Ti/CHT, respectively. According to stability tests, after the first cycle Orange II dye degradation was found to be 95%, while it was 37% after the fifth cycle. The results showed that the composite catalyst could be used several times for Orange II dye degradation.
Collapse
Affiliation(s)
- Pelin Demircivi
- Department of Chemical and Process Engineering, Faculty of Engineering, Yalova University, 77100 Yalova, Turkey E-mail:
| | - Esra Bilgin Simsek
- Department of Chemical and Process Engineering, Faculty of Engineering, Yalova University, 77100 Yalova, Turkey E-mail:
| |
Collapse
|
8
|
Synthesis of mesoporous worm-like ZrO 2 –TiO 2 monoliths and their photocatalytic applications towards organic dye degradation. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
9
|
Vaizoğullar Aİ. TiO2/ZnO Supported on Sepiolite: Preparation, Structural Characterization, and Photocatalytic Degradation of Flumequine Antibiotic in Aqueous Solution. CHEM ENG COMMUN 2017. [DOI: 10.1080/00986445.2017.1306518] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Ali İmran Vaizoğullar
- Vocational School of Health Care, Medical Laboratory Program, Muğla Sıtkı Koçman University, Muğla, Turkey
| |
Collapse
|
10
|
Guerrero-Araque D, Ramírez-Ortega D, Acevedo-Peña P, Tzompantzi F, Calderón HA, Gómez R. Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.11.030] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
11
|
Atanda L, Silahua A, Mukundan S, Shrotri A, Torres-Torres G, Beltramini J. Catalytic behaviour of TiO2–ZrO2 binary oxide synthesized by sol–gel process for glucose conversion to 5-hydroxymethylfurfural. RSC Adv 2015. [DOI: 10.1039/c5ra15739k] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A combination of TiO2–ZrO2 and Amberlyst 70 remarkably catalyzes glucose conversion to HMF in a biphasic media.
Collapse
Affiliation(s)
- Luqman Atanda
- Nanomaterials Centre
- Australian Institute for Bioengineering & Nanotechnology and School of Chemical Engineering
- The University of Queensland
- Brisbane
- Australia
| | - Adib Silahua
- Heterogeneous Catalysis Laboratory
- Universidad Juárez Autónoma de Tabasco
- Cunduacán
- Mexico
| | - Swathi Mukundan
- Nanomaterials Centre
- Australian Institute for Bioengineering & Nanotechnology and School of Chemical Engineering
- The University of Queensland
- Brisbane
- Australia
| | | | | | - Jorge Beltramini
- Nanomaterials Centre
- Australian Institute for Bioengineering & Nanotechnology and School of Chemical Engineering
- The University of Queensland
- Brisbane
- Australia
| |
Collapse
|
12
|
Alotaibi AM, Sathasivam S, Parkin IP. Aerosol assisted chemical vapour deposition of a ZrO2–TiO2 composite thin film with enhanced photocatalytic activity. RSC Adv 2015. [DOI: 10.1039/c5ra12340b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ZrO2–TiO2 composite thin film deposited via aerosol assisted chemical vapour deposition showed enhanced photocatalytic activity compared to pure anatase TiO2. The photocatalytic properties were determined using resasurin redox dye.
Collapse
Affiliation(s)
- Abdullah M. Alotaibi
- Materials Chemistry Centre
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| | - Sanjayan Sathasivam
- Materials Chemistry Centre
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| | - Ivan P. Parkin
- Materials Chemistry Centre
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| |
Collapse
|
13
|
Jiao J, Wei Y, Zhao Z, Liu J, Li J, Duan A, Jiang G. Photocatalysts of 3D Ordered Macroporous TiO2-Supported CeO2 Nanolayers: Design, Preparation, and Their Catalytic Performances for the Reduction of CO2 with H2O under Simulated Solar Irradiation. Ind Eng Chem Res 2014. [DOI: 10.1021/ie503333b] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jinqing Jiao
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| | - Yuechang Wei
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| | - Zhen Zhao
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| | - Jian Liu
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| | - Jianmei Li
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| | - Aijun Duan
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| | - Guiyuan Jiang
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China
| |
Collapse
|
14
|
Liu K, Cao M, Fujishima A, Jiang L. Bio-Inspired Titanium Dioxide Materials with Special Wettability and Their Applications. Chem Rev 2014; 114:10044-94. [DOI: 10.1021/cr4006796] [Citation(s) in RCA: 427] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Kesong Liu
- Key
Laboratory of Bio-Inspired Smart Interfacial Science and Technology
of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
- Institute
for Superconducting and Electronic Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW 2500, Australia
| | - Moyuan Cao
- Key
Laboratory of Bio-Inspired Smart Interfacial Science and Technology
of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
| | - Akira Fujishima
- Research
Institute for Science and Technology, Photocatalysis International
Research Center, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Lei Jiang
- Key
Laboratory of Bio-Inspired Smart Interfacial Science and Technology
of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| |
Collapse
|
15
|
WITHDRAWN: Utilization of zirconia and zinc incorporated HY zeolite as visible-light-driven-catalyst for the removal of methylene blue: Evaluation by central composite design analysis. J Taiwan Inst Chem Eng 2014. [DOI: 10.1016/j.jtice.2014.05.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone. APPLIED NANOSCIENCE 2014. [DOI: 10.1007/s13204-014-0313-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
17
|
Liu H, Su Y, Hu H, Cao W, Chen Z. An ionic liquid route to prepare mesoporous ZrO2–TiO2 nanocomposites and study on their photocatalytic activities. ADV POWDER TECHNOL 2013. [DOI: 10.1016/j.apt.2012.12.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
18
|
|
19
|
Nagarajan S, Mohana M, Sudhagar P, Raman V, Nishimura T, Kim S, Kang YS, Rajendran N. Nanocomposite coatings on biomedical grade stainless steel for improved corrosion resistance and biocompatibility. ACS APPLIED MATERIALS & INTERFACES 2012; 4:5134-5141. [PMID: 22967070 DOI: 10.1021/am301559r] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The 316 L stainless steel is one of the most commonly available commercial implant materials with a few limitations in its ease of biocompatibility and long-standing performance. Hence, porous TiO(2)/ZrO(2) nanocomposite coated over 316 L stainless steels was studied for their enhanced performance in terms of its biocompatibility and corrosion resistance, following a sol-gel process via dip-coating technique. The surface composition and porosity texture was studied to be uniform on the substrate. Biocompatibility studies on the TiO(2)/ZrO(2) nanocomposite coatings were investigated by placing the coated substrate in a simulated body fluid (SBF). The immersion procedure resulted in the complete coverage of the TiO(2)/ZrO(2) nanocomposite (coated on the surface of 316 L stainless steel) with the growth of a one-dimensional (1D) rod-like carbonate-containing apatite. The TiO(2)/ZrO(2) nanocomposite coated specimens showed a higher corrosion resistance in the SBF solution with an enhanced biocompatibility, surpassing the performance of the pure oxide coatings. The cell viability of TiO(2)/ZrO(2) nanocomposite coated implant surface was examined under human dermal fibroblasts culture, and it was observed that the composite coating enhances the proliferation through effective cellular attachment compared to pristine 316 L SS surface.
Collapse
Affiliation(s)
- Srinivasan Nagarajan
- Structural Metals Center, National Institute for Material Science (NIMS), 1-2-1 Sengen, 305-0047 Tsukuba, Ibaraki, Japan
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Li S. Photoinduced charge property of Ag-TiO2 films and its relationships with photocatalytic activity under visible illumination. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.4904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
21
|
Li Z, Shen J, Wang JQ, Wang D, Huang Y, Zou J. Single crystal titanate–zirconate nanoleaf: Synthesis, growth mechanism and enhanced photocatalytic hydrogen evolution properties. CrystEngComm 2012. [DOI: 10.1039/c1ce06088k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
22
|
Ionic liquid-templated synthesis of mesoporous CeO2–TiO2 nanoparticles and their enhanced photocatalytic activities under UV or visible light. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.06.014] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
23
|
Qin J, Lu J, Cao M, Hu C. Synthesis of porous CuO-CeO2 nanospheres with an enhanced low-temperature CO oxidation activity. NANOSCALE 2010; 2:2739-2743. [PMID: 20941437 DOI: 10.1039/c0nr00446d] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
CuO-CeO2 nanospheres with a porous structure were synthesized by an improved urea method involving first hydrothermal treatment to get Ce-Cu binary precursor and then the calcination of the precursor. The CuO-CeO2 nanospheres consist of spherical particles with diameters in the range of 300-400 nm. These nanospheres are actually composed of nanoparticles of ca. 10 nm, resulting in the formation of a mesoporous structure. Compared with conventional urea method, in which Ce-Cu binary precursor is commonly achieved in an oil bath at appropriate temperature, the Ce-Cu binary precursor obtained via the hydrothermal process could be more highly homogeneous and more highly interdispersed CuO-CeO2 thus was formed. In addition, the resulted porous CuO-CeO2 catalyst has a lower CO oxidation temperature of as low as 71 °C.
Collapse
Affiliation(s)
- Jinwen Qin
- Key Laboratory of Cluster Science, Ministry of Education of China, Department of Chemistry, Beijing Institute of Technology, Beijing, 100081, PR China
| | | | | | | |
Collapse
|
24
|
Schiller R, Weiss CK, Landfester K. Phase stability and photocatalytic activity of Zr-doped anatase synthesized in miniemulsion. NANOTECHNOLOGY 2010; 21:405603. [PMID: 20829575 DOI: 10.1088/0957-4484/21/40/405603] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A series of mesoporous anatase-type TiO(2) doped with zirconium (0-50 mol% Zr) was synthesized by combining the sol-gel process with the inverse miniemulsion technique. Nanoparticles between 100 and 300 nm were directly prepared from acidic precursor solutions of titanium glycolate (EGMT) and zirconium isopropoxide. The miniemulsion technique is a simple and convenient method to synthesize nanoparticles of homogeneous size because the reactions (here hydrolysis and condensation) take place in the confined space of nanodroplets (several hundreds of nanometres) and therefore in a highly controlled manner. For low doping levels (0-7.1 mol% Zr), Zr(x)Ti(1 - x)O(2) solid solutions were formed where Zr was uniformly dispersed into the anatase framework. For higher amounts of zirconium (Zr >or= 7.1 mol%), the crystallization of zirconium titanate (ZrTiO(4)) occurred at a low temperature of 650 degrees C and it was obtained as a pure material for 47.4 mol% <or= Zr <or= 50 mol%. The influence of the amount of zirconium on the crystallinity, crystallite size, phase composition and stability, morphology and specific surface area was investigated. For the characterization transmission electron microscopy (TEM), x-ray diffraction (XRD), nitrogen sorption (BET) and inductively coupled plasma-optical emission spectrometry (ICP-OES) were used. The photocatalytic activity of the crystalline mixed oxides (0-9.4 mol% Zr) was examined for the degradation of methylene blue under UV irradiation.
Collapse
|
25
|
Zhou W, Pan K, Qu Y, Sun F, Tian C, Ren Z, Tian G, Fu H. Photodegradation of organic contamination in wastewaters by bonding TiO2/single-walled carbon nanotube composites with enhanced photocatalytic activity. CHEMOSPHERE 2010; 81:555-61. [PMID: 20851455 DOI: 10.1016/j.chemosphere.2010.08.059] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 08/31/2010] [Accepted: 08/31/2010] [Indexed: 05/04/2023]
Abstract
Bonding TiO(2)/single-walled carbon nanotube (SWCNT) composites have been successfully synthesized through a facile sol-solvothermal technique. The obtained materials were characterized in detail by XRD, FT-IR, Raman and TEM. The results revealed that TiO(2) and SWNCT linked compactly through ester bonds and thus improved their interfaces. Therefore, the recombination of photogenerated electron-hole pairs was inhibited efficiently, which improved the photocatalytic activity. A reasonable mechanism was proposed to explain its formation. The photocatalytic activity was investigated utilizing rhodamine B and nitrobenzene (NB) as models for organic contamination in wastewaters. Experimental results indicated that this bonding composite exhibited higher photocatalytic activity than that of Degussa P25. The excellent photocatalytic activity could be attributed to larger surface area, smaller crystalline size, and especially the ester bonds, which was further confirmed by surface photovoltage spectroscopy. Furthermore, by adding ()OH scavenger tert-butanol, the obvious decrease of NB photodegradation indicated that NB was oxidized primarily by ()OH. The photodegradation products were identified by GC/MS, further indicating that the degradation proceeded via ()OH oxidation. A possible reaction pathway for the degradation of NB was suggested by the evidence presented in this study.
Collapse
Affiliation(s)
- Wei Zhou
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Aman N, Mishra T, Sahu RK, Tiwari JP. Facile synthesis of mesoporous N doped zirconium titanium mixed oxide nanomaterial with enhanced photocatalytic activity under visible light. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01342k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
27
|
Maver K, Stangar UL, Cernigoj U, Gross S, Cerc Korosec R. Low-temperature synthesis and characterization of TiO2 and TiO2-ZrO2 photocatalytically active thin films. Photochem Photobiol Sci 2009; 8:657-62. [PMID: 19424539 DOI: 10.1039/b817475j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transparent TiO(2) and TiO(2)-ZrO(2) (molar ratio Zr/Ti = 0.1) thin films were produced by low-temperature sol-gel processing from nanocrystalline aqueous based solutions. The structural features and compositions of the films treated at room temperature, 100 degrees C and 500 degrees C were investigated by X-ray diffraction, X-ray photoelectron spectroscopy and thermal analysis. Addition of zirconia increased specific surface area (140-230 m(2) g(-1)) and hindered the growth of anatase crystallites, exhibiting a constant size of 6-7 nm in the whole temperature range. These significant changes with respect to pure TiO(2) in anatase crystalline form did not result in significantly and systematically different photocatalytic activity, which was evaluated in terms of aqueous pollutant degradation (azo-dye in water) and self-cleaning ability (fatty contaminant deposit). The films treated at only 100 degrees C showed excellent photocatalytic activity towards azo-dye degradation. Contact angle measurements of aged and contaminated surfaces revealed a fast or sharp hydrophilicity gain under UVA illumination. Accordingly, the results of this study confirmed the potential application of advantageous low-temperature films in water treatment as well as for self-cleaning surfaces.
Collapse
Affiliation(s)
- Ksenija Maver
- Laboratory for Environmental Research, University of Nova Gorica, Vipavska 13, 5001, Nova Gorica, Slovenia
| | | | | | | | | |
Collapse
|