51
|
Wang X, Wang X, Zhao J, Chen J, Zhang J, Song J, Huang J. Bioframe synthesis of NF–TiO2/straw charcoal composites for enhanced adsorption-visible light photocatalytic degradation of RhB. RSC Adv 2015. [DOI: 10.1039/c5ra10639g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
N–F codoped TiO2/straw charcoal composites (NF–TiO2/SC) were synthesized using a simple, bioframe-assisted sol–gel method and confirmed by XRD, SEM, EDX, TEM, N2 adsorption–desorption, Raman, FT-IR, XPS, and UV-vis DRS measurements.
Collapse
Affiliation(s)
- Xin Wang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| | - Xuejiang Wang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| | - Jianfu Zhao
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| | - Jie Chen
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| | - Jing Zhang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| | - Jingke Song
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| | - Jiayu Huang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Shanghai 200092
- China
| |
Collapse
|
52
|
Li Y, Ding K, Cheng B, Zhang Y, Lu Y. N,F-monodoping and N/F-codoping effects on the electronic structures and optical performances of Zn2GeO4. Phys Chem Chem Phys 2015; 17:5613-23. [DOI: 10.1039/c4cp05395h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With N/F codoping, the optical absorption property of Zn2GeO4was improved under visible-light irradiation, which may promote the photocatalytic activity.
Collapse
Affiliation(s)
- Yulu Li
- College of Chemistry
- Fuzhou University
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou
| | - Kaining Ding
- College of Chemistry
- Fuzhou University
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou
| | - Beisi Cheng
- College of Chemistry
- Fuzhou University
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou
| | - Yongfan Zhang
- College of Chemistry
- Fuzhou University
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- Fuzhou
| | - Yunpeng Lu
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- Singapore
| |
Collapse
|
53
|
Shin SH, Chun HH, Jo WK. Enhanced Photocatalytic Efficiency of N-F-Co-Embedded Titania under Visible Light Exposure for Removal of Indoor-Level Pollutants. MATERIALS 2014; 8:31-41. [PMID: 28787922 PMCID: PMC5455237 DOI: 10.3390/ma8010031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Accepted: 12/01/2014] [Indexed: 10/26/2022]
Abstract
N-F-co-embedded titania (N-F-TiO₂) photocatalysts with varying N:F ratios were synthesized and tested for their ability to photocatalyze the degradation of pollutants present at indoor air levels using visible light. The synthesis was achieved using a solvothermal process with tetrabutyl titanate, urea and ammonium fluoride as sources of Ti, N and F, respectively. Three selected volatile organic compounds (toluene, ethyl benzene and o-xylene) were selected as the test pollutants. The prepared composites were characterized using X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and Ultra-violet (UV)-visible spectroscopy. The photocatalytic degradation efficiencies of N-F-TiO₂ composites were higher than those obtained using pure TiO₂ and N-TiO₂. Moreover, these efficiencies increased as the N:F ratio decreased from sixteen to eight, then decreased as it dropped further to three, indicating the presence of an optimal N:F ratio. Meanwhile, as retention time decreased from 12.4 to 0.62 s, the average photocatalytic efficiencies decreased from 65.4% to 21.7%, 91.5% to 37.8% and 95.8% to 44.7% for toluene, ethyl benzene and o-xylene, respectively. In contrast, the photocatalytic reaction rates increased as retention time decreased. In consideration of all of these factors, under optimized operational conditions, the prepared N-F-TiO₂ composites could be utilized for the degradation of target pollutants at indoor air levels using visible light.
Collapse
Affiliation(s)
- Seung-Ho Shin
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea.
| | - Ho-Hwan Chun
- Department of Naval Architecture and Ocean Engineering, Pusan National University, 63 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea.
| | - Wan-Kuen Jo
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea.
| |
Collapse
|
54
|
Han C, Likodimos V, Khan JA, Nadagouda MN, Andersen J, Falaras P, Rosales-Lombardi P, Dionysiou DD. UV-visible light-activated Ag-decorated, monodisperse TiO2 aggregates for treatment of the pharmaceutical oxytetracycline. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:11781-11793. [PMID: 24217967 DOI: 10.1007/s11356-013-2233-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 10/09/2013] [Indexed: 06/02/2023]
Abstract
Noble metal Ag-decorated, monodisperse TiO2 aggregates were successfully synthesized by an ionic strength-assisted, simple sol-gel method and were used for the photocatalytic degradation of the antibiotic oxytetracycline (OTC) under both UV and visible light (UV-visible light) irradiation. The synthesized samples were characterized by X-ray diffraction analysis (XRD); UV-vis diffuse reflectance spectroscopy; environmental scanning electron microscopy (ESEM); transmission electron microscopy (TEM); high-resolution TEM (HR-TEM); micro-Raman, energy-dispersive X-ray spectroscopy (EDS); and inductively coupled plasma optical emission spectrometry (ICP-OES). The results showed that the uniformity of TiO2 aggregates was finely tuned by the sol-gel method, and Ag was well decorated on the monodisperse TiO2 aggregates. The absorption of the samples in the visible light region increased with increasing Ag loading that was proportional to the amount of Ag precursor added in the solution over the tested concentration range. The Brunauer, Emmett, and Teller (The BET) surface area slightly decreased with increasing Ag loading on the TiO2 aggregates. Ag-decorated TiO2 samples demonstrated enhanced photocatalytic activity for the degradation of OTC under UV-visible light illumination compared to that of pure TiO2. The sample containing 1.9 wt% Ag showed the highest photocatalytic activity for the degradation of OTC under both UV-visible light and visible light illumination. During the experiments, the detected Ag leaching for the best TiO2-Ag photocatalyst was much lower than the National Secondary Drinking Water Regulation for Ag limit (0.1 mg L(-1)) issued by the US Environmental Protection Agency.
Collapse
Affiliation(s)
- Changseok Han
- Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221-0012, USA
| | | | | | | | | | | | | | | |
Collapse
|
55
|
Asahi R, Morikawa T, Irie H, Ohwaki T. Nitrogen-Doped Titanium Dioxide as Visible-Light-Sensitive Photocatalyst: Designs, Developments, and Prospects. Chem Rev 2014; 114:9824-52. [DOI: 10.1021/cr5000738] [Citation(s) in RCA: 940] [Impact Index Per Article: 94.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ryoji Asahi
- Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Takeshi Morikawa
- Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Hiroshi Irie
- Clean
Energy Research Center, University of Yamanashi, Kofu, Yamanashi 400-8511, Japan
| | - Takeshi Ohwaki
- Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| |
Collapse
|
56
|
Banerjee S, Pillai SC, Falaras P, O'Shea KE, Byrne JA, Dionysiou DD. New Insights into the Mechanism of Visible Light Photocatalysis. J Phys Chem Lett 2014; 5:2543-54. [PMID: 26277942 DOI: 10.1021/jz501030x] [Citation(s) in RCA: 254] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In recent years, the area of developing visible-light-active photocatalysts based on titanium dioxide has been enormously investigated due to its wide range of applications in energy and environment related fields. Various strategies have been designed to efficiently utilize the solar radiation and to enhance the efficiency of photocatalytic processes. Building on the fundamental strategies to improve the visible light activity of TiO2-based photocatalysts, this Perspective aims to give an insight into many contemporary developments in the field of visible-light-active photocatalysis. Various examples of advanced TiO2 composites have been discussed in relation to their visible light induced photoconversion efficiency, dynamics of electron-hole separation, and decomposition of organic and inorganic pollutants, which suggest the critical need for further development of these types of materials for energy conversion and environmental remediation purposes.
Collapse
Affiliation(s)
- Swagata Banerjee
- † Centre for Research in Engineering Surface Technology (CREST), FOCAS Institute, Dublin Institute of Technology, Kevin St, Dublin 8, Ireland
| | - Suresh C Pillai
- ‡ Department of Environmental Science, Institute of Technology Sligo, Sligo, Ireland
- § Centre for Precision Engineering, Materials and Manufacturing Research (PEM), Institute of Technology Sligo, Sligo, Ireland
| | - Polycarpos Falaras
- ∥ Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, NCSR Demokritos, Agia Paraskevi Attikis, P.O. Box 6003, 15310 Athens, Greece
| | - Kevin E O'Shea
- ⊥ Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - John A Byrne
- # Nanotechnology and Integrated Bio-Engineering Centre, School of Engineering, Faculty of Computing and Engineering, University of Ulster, Newtownabbey, Northern Ireland BT37 0QB, United Kingdom
| | - Dionysios D Dionysiou
- ¶ Environmental Engineering and Science Program, School of Energy, Environmental, Biological, and Medical Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012, United States
| |
Collapse
|
57
|
Marschall R, Wang L. Non-metal doping of transition metal oxides for visible-light photocatalysis. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.10.088] [Citation(s) in RCA: 250] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
58
|
Zhao C, Pelaez M, Dionysiou DD, Pillai SC, Byrne JA, O'Shea KE. UV and visible light activated TiO2 photocatalysis of 6-hydroxymethyl uracil, a model compound for the potent cyanotoxin cylindrospermopsin. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.09.042] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
59
|
Han C, Andersen J, Likodimos V, Falaras P, Linkugel J, Dionysiou DD. The effect of solvent in the sol–gel synthesis of visible light-activated, sulfur-doped TiO2 nanostructured porous films for water treatment. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.11.052] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
60
|
Jo WK, Tayade RJ. New Generation Energy-Efficient Light Source for Photocatalysis: LEDs for Environmental Applications. Ind Eng Chem Res 2014. [DOI: 10.1021/ie404176g] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Wan-Kuen Jo
- Department
of Environmental Engineering, Kyunpook National University, 80 University
Road, Bukgu, Daegu 702-701, Republic of Korea
| | - Rajesh J. Tayade
- Department
of Environmental Engineering, Kyunpook National University, 80 University
Road, Bukgu, Daegu 702-701, Republic of Korea
- Discipline
of Inorganic Materials and Catalysis, Central Salt and Marine Chemicals
Research Institute, Council of Scientific and Industrial Research
(CSIR), G. B. Marg, Bhavnagar-364002, Gujarat, India
| |
Collapse
|
61
|
Keane DA, McGuigan KG, Ibáñez PF, Polo-López MI, Byrne JA, Dunlop PSM, O'Shea K, Dionysiou DD, Pillai SC. Solar photocatalysis for water disinfection: materials and reactor design. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00006d] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This comprehensive review addresses the fundamentals of photocatalytic mechanism, recent developments in materials synthesis and reactor design.
Collapse
Affiliation(s)
- Donal A. Keane
- Chemistry Department and Environmental Research Institute
- University College Cork
- Cork, Ireland
| | - Kevin G. McGuigan
- Department of Physiology & Medical Physics
- Royal College of Surgeons in Ireland
- Dublin 2, Ireland
| | | | | | - J. Anthony Byrne
- Nanotechnology and Integrated Bio-Engineering Centre
- School of Engineering
- Faculty of Computing and Engineering
- University of Ulster
- Newtownabbey, UK
| | - Patrick S. M. Dunlop
- Nanotechnology and Integrated Bio-Engineering Centre
- School of Engineering
- Faculty of Computing and Engineering
- University of Ulster
- Newtownabbey, UK
| | - Kevin O'Shea
- Department of Chemistry and Biochemistry
- Florida International University
- Miami, USA
| | - Dionysios D. Dionysiou
- Environmental Engineering and Science Program
- Department of Biomedical
- Chemical and Environmental Engineering
- University of Cincinnati
- Cincinnati, USA
| | - Suresh C. Pillai
- Department of Environmental Science
- School of Science
- Institute of Technology Sligo
- Sligo, Ireland
- Centre for Precision Engineering, Materials and Manufacturing Research (PEM)
| |
Collapse
|
62
|
|
63
|
Grčić I, Li Puma G. Photocatalytic degradation of water contaminants in multiple photoreactors and evaluation of reaction kinetic constants independent of photon absorption, irradiance, reactor geometry, and hydrodynamics. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:13702-13711. [PMID: 24160737 DOI: 10.1021/es403472e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The literature on photocatalytic oxidation of water pollutants often reports reaction kinetic constants, which cannot be unraveled from photoreactor type and experimental conditions. This study addresses this challenging aspect by presenting a general and simple methodology for the evaluation of fundamental "intrinsic" reaction kinetic constants of photocatalytic degradation of water contaminants, which are independent of photoreactor type, catalyst concentration, irradiance levels, and hydrodynamics. The degradation of the model contaminant, oxalic acid (OA) on titanium dioxide (TiO2) aqueous suspensions, was monitored in two annular photoreactors (PR1 and PR2). The photoreactors with significantly different geometries were operated under different hydrodynamic regimes (turbulent batch mode and laminar flow-through recirculation mode), optical thicknesses, catalyst and OA concentrations, and photon irradiances. The local volumetric rate of photon absorption (LVRPA) was evaluated by the six-flux radiation absorption-scattering model (SFM). The SFM was further combined with a comprehensive kinetic model for the adsorption and photodecomposition of OA on TiO2 to determine local reaction rates and, after integration over the reactor volume, the intrinsic reaction kinetic constants. The model could determine the oxidation of OA in both PR1 and PR2 under a wide range of experimental conditions. This study demonstrates a more meaningful way for determining reaction kinetic constants of photocatalytic degradation of water contaminants.
Collapse
Affiliation(s)
- Ivana Grčić
- Faculty of Chemical Engineering and Technology, University of Zagreb , Marulicev trg 19, 10000 Zagreb, Croatia
| | | |
Collapse
|
64
|
Boyd GR, Tuccillo ME, Sandvig A, Pelaez M, Han C, Dionysiou DD. Nanomaterials: Removal processes and beneficial applications in treatment. ACTA ACUST UNITED AC 2013. [DOI: 10.5942/jawwa.2013.105.0154] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
| | | | | | | | - Changseok Han
- Environmental Engineering and Science Program; University of Cincinnati; Cincinnati Ohio
| | - Dionysios D. Dionysiou
- Environmental Engineering and Science Program; University of Cincinnati; Cincinnati Ohio
| |
Collapse
|
65
|
Roegner AF, Brena B, González-Sapienza G, Puschner B. Microcystins in potable surface waters: toxic effects and removal strategies. J Appl Toxicol 2013; 34:441-57. [PMID: 24038121 DOI: 10.1002/jat.2920] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 07/16/2013] [Accepted: 07/17/2013] [Indexed: 02/01/2023]
Abstract
In freshwater, harmful cyanobacterial blooms threaten to increase with global climate change and eutrophication of surface waters. In addition to the burden and necessity of removal of algal material during water treatment processes, bloom-forming cyanobacteria can produce a class of remarkably stable toxins, microcystins, difficult to remove from drinking water sources. A number of animal intoxications over the past 20 years have served as sentinels for widespread risk presented by microcystins. Cyanobacterial blooms have the potential to threaten severely both public health and the regional economy of affected communities, particularly those with limited infrastructure or resources. Our main objectives were to assess whether existing water treatment infrastructure provides sufficient protection against microcystin exposure, identify available options feasible to implement in resource-limited communities in bloom scenarios and to identify strategies for improved solutions. Finally, interventions at the watershed level aimed at bloom prevention and risk reduction for entry into potable water sources were outlined. We evaluated primary studies, reviews and reports for treatment options for microcystins in surface waters, potable water sources and treatment plants. Because of the difficulty of removal of microcystins, prevention is ideal; once in the public water supply, the coarse removal of cyanobacterial cells combined with secondary carbon filtration of dissolved toxins currently provides the greatest potential for protection of public health. Options for point of use filtration must be optimized to provide affordable and adequate protection for affected communities.
Collapse
Affiliation(s)
- Amber F Roegner
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA, 95616, USA
| | | | | | | |
Collapse
|
66
|
Pathakoti K, Morrow S, Han C, Pelaez M, He X, Dionysiou DD, Hwang HM. Photoinactivation of Escherichia coli by sulfur-doped and nitrogen-fluorine-codoped TiO2 nanoparticles under solar simulated light and visible light irradiation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9988-9996. [PMID: 23906338 DOI: 10.1021/es401010g] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Titanium dioxide (TiO2) is one of the most widely used photocatalysts for the degradation of organic contaminants in water and air. Visible light (VL) activated sulfur-doped TiO2 (S-TiO2) and nitrogen-fluorine-codoped TiO2 (N-F-TiO2) were synthesized by sol-gel methods and characterized. Their photoinactivation performance was tested against Escherichia coli under solar simulated light (SSL) and VL irradiation with comparison to commercially available TiO2. Undoped Degussa-Evonik P-25 (P-25) and Sigma-TiO2 showed the highest photocatalytic activity toward E. coli inactivation under SSL irradiation, while S-TiO2 showed a moderate toxicity. After VL irradiation, Sigma-TiO2 showed higher photoinactivation, whereas S-TiO2 and P-25 showed moderate toxicity. Oxidative stress to E. coli occurred via formation of hydroxyl radicals leading to lipid peroxidation as the primary mechanism of bacterial inactivation. Various other biological models, including human keratinocytes (HaCaT), zebrafish liver cells (ZFL), and zebrafish embryos were also used to study the toxicity of TiO2 NPs. In conclusion, N-F-TiO2 did not show any toxicity based on the assay results from all the biological models used in this study, whereas S-TiO2 was toxic to zebrafish embryos under all the test conditions. These findings also demonstrate that the tested TiO2 nanoparticles do not show any adverse effects in HaCaT and ZFL cells.
Collapse
Affiliation(s)
- Kavitha Pathakoti
- Department of Biology, Jackson State University , Jackson, Mississippi 39217, United States
| | | | | | | | | | | | | |
Collapse
|
67
|
Visible-light-activated photoelectrochemical biosensor for the study of acetylcholinesterase inhibition induced by endogenous neurotoxins. Biosens Bioelectron 2013; 45:292-9. [DOI: 10.1016/j.bios.2013.01.075] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 01/11/2013] [Accepted: 01/21/2013] [Indexed: 11/20/2022]
|
68
|
Cheng ZW, Feng L, Chen JM, Yu JM, Jiang YF. Photocatalytic conversion of gaseous ethylbenzene on lanthanum-doped titanium dioxide nanotubes. JOURNAL OF HAZARDOUS MATERIALS 2013; 254-255:354-363. [PMID: 23643959 DOI: 10.1016/j.jhazmat.2013.03.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 03/13/2013] [Accepted: 03/16/2013] [Indexed: 06/02/2023]
Abstract
The photocatalytic properties of titanium dioxide (TiO₂) make it an attractive material for environmental remediation. In the present study, lanthanum (La(3+))-doped TiO2 nanotubes with excellent photocatalytic activity were fabricated by a combination of sol-gel method and hydrothermal technique. The optimal preparation parameters were determined by the structural characterization using a range of methods and the photocatalytic degradation of gaseous ethylbenzene (EB). Compared with pure TiO₂ nanoparticles, 1.2%-La(3+)-doped - titania nanotubes (1.2%-La(3+)-TNTs) exhibited higher activity under 254 nm UV for conversion of EB. The initial EB concentrations and relative humidity (RH) obviously influenced the photocatalytic activity of 1.2%-La(3+)-TNTs. Kinetic analysis showed that surface adsorption and surface reaction controlled the rate-determining step for RH of 40-50% and >80%, respectively. Gas chromatography and mass spectrometry were used to analyze the intermediates generated in the conversion of EB, allowing a tentative decomposition pathway to be proposed. The prepared photocatalyst exhibited enhanced EB conversion compared with undoped TiO₂, and showed a promise for the decomposition of recalcitrant compounds before subsequent biopurification.
Collapse
Affiliation(s)
- Zhuo-Wei Cheng
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China
| | - Li Feng
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China
| | - Jian-Meng Chen
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China.
| | - Jian-Ming Yu
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China
| | - Yi-Feng Jiang
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China.
| |
Collapse
|
69
|
|
70
|
Enhanced visible light photocatalytic activity of CN-codoped TiO2 films for the degradation of microcystin-LR. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcata.2013.02.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
71
|
Barndõk H, Peláez M, Han C, Platten WE, Campo P, Hermosilla D, Blanco A, Dionysiou DD. Photocatalytic degradation of contaminants of concern with composite NF-TiO2 films under visible and solar light. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:3582-3591. [PMID: 23436122 DOI: 10.1007/s11356-013-1550-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 02/04/2013] [Indexed: 06/01/2023]
Abstract
This study reports the synthesis and characterization of composite nitrogen and fluorine co-doped titanium dioxide (NF-TiO(2)) for the removal of contaminants of concern in wastewater under visible and solar light. Monodisperse anatase TiO(2) nanoparticles of different sizes and Evonik P25 were assembled to immobilized NF-TiO(2) by direct incorporation into the sol-gel or by the layer-by-layer technique. The composite films were characterized with X-ray diffraction, high-resolution transmission electron microscopy, environmental scanning electron microscopy, and porosimetry analysis. The photocatalytic degradation of atrazine, carbamazepine, and caffeine was evaluated in a synthetic water solution and in an effluent from a hybrid biological concentrator reactor (BCR). Minor aggregation and improved distribution of monodisperse titania particles was obtained with NF-TiO(2)-monodisperse (10 and 50 nm) from the layer-by-layer technique than with NF-TiO(2) +monodisperse TiO(2) (300 nm) directly incorporated into the sol. The photocatalysts synthesized with the layer-by-layer method achieved significantly higher degradation rates in contrast with NF-TiO(2)-monodisperse titania (300 nm) and slightly faster values when compared with NF-TiO(2)-P25. Using NF-TiO(2) layer-by-layer with monodisperse TiO(2) (50 nm) under solar light irradiation, the respective degradation rates in synthetic water and BCR effluent were 14.6 and 9.5 × 10(-3) min(-1) for caffeine, 12.5 and 9.0 × 10(-3) min(-1) for carbamazepine, and 10.9 and 5.8 × 10(-3) min(-1) for atrazine. These results suggest that the layer-by-layer technique is a promising method for the synthesis of composite TiO(2)-based films compared to the direct addition of nanoparticles into the sol.
Collapse
Affiliation(s)
- H Barndõk
- Department of Chemical Engineering, Complutense University of Madrid, Avda. Complutense, s/n, 28040, Madrid, Spain.
| | | | | | | | | | | | | | | |
Collapse
|
72
|
Pantelić D, Svirčev Z, Simeunović J, Vidović M, Trajković I. Cyanotoxins: characteristics, production and degradation routes in drinking water treatment with reference to the situation in Serbia. CHEMOSPHERE 2013; 91:421-441. [PMID: 23391374 DOI: 10.1016/j.chemosphere.2013.01.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 12/26/2012] [Accepted: 01/02/2013] [Indexed: 06/01/2023]
Abstract
Cyanobacteria are members of phytoplankton of the surface freshwaters. The accelerated eutrophication of freshwaters, especially reservoirs for drinking water, by human activity has increased the occurrence and intensity of cyanobacterial blooms. They are of concern due to their ability to produce taste and odors compounds, a wide range of toxins, which have a hepatotoxic, neurotoxic, cytotoxic and dermatotoxic behavior, being dangerous to animal and human health. Therefore, the removal of cyanobacteria, without cell lysis, and releasing of intracellular metabolites, would significantly reduce the concentration of these metabolites in the finished drinking water, as a specific aim of the water treatment processes. This review summarizes the existing data on characteristics of the cyanotoxins, their productions in environment and effective treatment processes to remove these toxins from drinking water.
Collapse
Affiliation(s)
- Dijana Pantelić
- University of Novi Sad, Department of Biology and Ecology, Faculty of Sciences, Trg Dositeja Obradovića 2, 21000 Novi Sad, Serbia.
| | | | | | | | | |
Collapse
|
73
|
Niu Y, Xing M, Zhang J, Tian B. Visible light activated sulfur and iron co-doped TiO2 photocatalyst for the photocatalytic degradation of phenol. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.04.035] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
74
|
Likodimos V, Han C, Pelaez M, Kontos AG, Liu G, Zhu D, Liao S, de la Cruz AA, O’Shea K, Dunlop PSM, Byrne JA, Dionysiou DD, Falaras P. Anion-Doped TiO2 Nanocatalysts for Water Purification under Visible Light. Ind Eng Chem Res 2013. [DOI: 10.1021/ie3034575] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vlassis Likodimos
- Division of Physical Chemistry, Institute of Advanced Materials,
Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 153 10 Aghia Paraskevi Attikis, Athens, Greece
| | - Changseok Han
- Environmental Engineering and Science Program,
School of Energy, Environmental, Biological and Medical Engineering, University of Cincinnati, United States
| | - Miguel Pelaez
- Environmental Engineering and Science Program,
School of Energy, Environmental, Biological and Medical Engineering, University of Cincinnati, United States
| | - Athanassios G. Kontos
- Division of Physical Chemistry, Institute of Advanced Materials,
Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 153 10 Aghia Paraskevi Attikis, Athens, Greece
| | - Guanglong Liu
- Environmental Engineering and Science Program,
School of Energy, Environmental, Biological and Medical Engineering, University of Cincinnati, United States
- Laboratory Plant Nutrition and Ecological
Environment Res., Huazhong Agricultural University, China
| | - Duanwei Zhu
- Laboratory Plant Nutrition and Ecological
Environment Res., Huazhong Agricultural University, China
| | - Shuijiao Liao
- Laboratory Plant Nutrition and Ecological
Environment Res., Huazhong Agricultural University, China
| | - Armah A. de la Cruz
- Office of Research
and Development, U.S. EPA, Cincinnati,
Ohio 45268, United States
| | - Kevin O’Shea
- Department of Chemistry and Biochemistry, Florida International University, Miami, United States
| | | | - J. Anthony Byrne
- Nanotechnology and Integrated BioEngineering Centre, University of Ulster, U.K
| | - Dionysios D. Dionysiou
- Environmental Engineering and Science Program,
School of Energy, Environmental, Biological and Medical Engineering, University of Cincinnati, United States
- Nireas-International Water Research Centre, University of Cyprus, 20537 Nicosia, Cyprus
| | - Polycarpos Falaras
- Division of Physical Chemistry, Institute of Advanced Materials,
Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 153 10 Aghia Paraskevi Attikis, Athens, Greece
| |
Collapse
|
75
|
Pelaez M, Baruwati B, Varma RS, Luque R, Dionysiou DD. Microcystin-LR removal from aqueous solutions using a magnetically separable N-doped TiO2 nanocomposite under visible light irradiation. Chem Commun (Camb) 2013; 49:10118-20. [DOI: 10.1039/c3cc44415e] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
76
|
Han C, Andersen J, Pillai SC, Fagan R, Falaras P, Byrne JA, Dunlop PSM, Choi H, Jiang W, O’Shea K, Dionysiou DD. Chapter Green Nanotechnology: Development of Nanomaterials for Environmental and Energy Applications. ACS SYMPOSIUM SERIES 2013. [DOI: 10.1021/bk-2013-1124.ch012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Changseok Han
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Joel Andersen
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Suresh C. Pillai
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Rachel Fagan
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Polycarpos Falaras
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - J. Anthony Byrne
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Patrick S. M. Dunlop
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Hyeok Choi
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Wenjun Jiang
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Kevin O’Shea
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| | - Dionysios D. Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, U.S.A
- Centre for Research in Engineering Surface Technology (CREST) FOCAS Institute, Dublin Institute of Technology, Kevin St., Dublin 8, Ireland
- Division of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems (IAMPPNM), National Center for Scientific Research “Demokritos”, 15310 Aghia Parakevi Attikis, Athens, Greece
- Nanotechnology and Integrated BioEngineering Centre, School of Engineering, University of Ulster, Northern Ireland, BT37 0QB, United Kingdom
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019-0308, U.S.A
| |
Collapse
|
77
|
Zhao Z, Li Z, Zou Z. First-Principles Calculations on Electronic Structures of N/V-Doped and N-V-Dodoped Anatase TiO2(101) Surfaces. Chemphyschem 2012; 13:3836-47. [DOI: 10.1002/cphc.201200575] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Indexed: 11/10/2022]
|
78
|
Liu G, Han C, Pelaez M, Zhu D, Liao S, Likodimos V, Ioannidis N, Kontos AG, Falaras P, Dunlop PSM, Byrne JA, Dionysiou DD. Synthesis, characterization and photocatalytic evaluation of visible light activated C-doped TiO2 nanoparticles. NANOTECHNOLOGY 2012; 23:294003. [PMID: 22743554 DOI: 10.1088/0957-4484/23/29/294003] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We have demonstrated heterogeneous photocatalytic degradation of microcystin-LR (MC-LR) by visible light activated carbon doped TiO(2) (C-TiO(2)) nanoparticles, synthesized by a modified sol-gel route based on the self-assembly technique exploiting oleic acid as a pore directing agent and carbon source. The C-TiO(2) nanoparticles crystallize in anatase phase despite the low calcination temperature of 350 °C and exhibit a highly porous structure that can be optimized by tuning the concentration of the oleic acid surfactant. The carbon modified nanomaterials exhibited enhanced absorption in the broad visible light region together with an apparent red shift in the optical absorption edge by 0.5 eV (2.69 eV), compared to the 3.18 eV of reference anatase TiO(2). Carbon species were identified by x-ray photoelectron spectroscopy analysis through the formation of both Ti-C and C-O bonds, indicative of substitution of carbon for oxygen atoms and the formation of carbonates, respectively. Electron paramagnetic resonance spectroscopy revealed the formation of two carbon related paramagnetic centers in C-TiO(2), whose intensity was markedly enhanced under visible light illumination, pointing to the formation of localized states within the anatase band gap, following carbon doping. The photocatalytic activity of C-TiO(2) nanomaterials was evaluated for the degradation of MC-LR at pH 3.0 under visible light (λ > 420 nm) irradiation. The doped materials showed a higher MC-LR degradation rate than reference TiO(2), behavior that is attributed to the incorporation of carbon into the titania lattice.
Collapse
Affiliation(s)
- Guanglong Liu
- Laboratory of Plant Nutrition and Ecological Environment Research, Centre for Microelement Research of Huazhong Agricultural University, Ministry of Agriculture, Wuhan 430070, People's Republic of China
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
79
|
Fluorinated semiconductor photocatalysts: tunable synthesis and unique properties. Adv Colloid Interface Sci 2012; 173:35-53. [PMID: 22425280 DOI: 10.1016/j.cis.2012.02.004] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 02/19/2012] [Accepted: 02/21/2012] [Indexed: 11/23/2022]
Abstract
Semiconductor photocatalysts are of great significance in solar energy conversion and environmental remediation. To overcome serious drawbacks of these materials with respect to narrow light-response range and low quantum efficiency, a variety of strategies have been developed in the past decades to enhance the light harvesting and excitation as well as the charge transfer against recombination. In particular, fluorination of semiconductor photocatalysts can be employed to modify their surface and bulk properties, and consequently, to enhance their photocatalytic performance. This review presents a comprehensive description of the F-mediated synthesis and unique properties of fluorinated semiconductor photocatalysts, in particular titanium dioxide (TiO(2)). The available strategies for the synthesis of fluorinated photocatalysts include post-synthesis fluorination and in-situ fluorination. Depending on the synthesis route and conditions, it is possible to control the chemical nature of incorporated fluorine (such as adsorbed fluoride and lattice-doped fluorine) and the fluoride-mediated crystal modification and organization, which often results in exceptional surface and bulk physicochemical properties, giving rise to unique photocatalytic properties. Significantly, the surface fluorination induces unusual adsorption behavior and interfacial charge transfer dynamics, directly affecting photocatalytic redox properties of the surface-fluorinated photocatalysts. The lattice fluorine-doping, sole or cooperative with other complementary co-dopants, introduces special localized electronic structures and surface defect states, accounting for the exceptional visible-light photoactivity of the fluorine-doped photocatalysts. Finally, recent advances in the synthesis and properties of fluorinated photocatalysts are summarized along with perspectives on further developments in this area of research.
Collapse
|
80
|
Zhang Z, Xu Y, Ma X, Li F, Liu D, Chen Z, Zhang F, Dionysiou DD. Microwave degradation of methyl orange dye in aqueous solution in the presence of nano-TiO2-supported activated carbon (supported-TiO2/AC/MW). JOURNAL OF HAZARDOUS MATERIALS 2012; 209-210:271-7. [PMID: 22309653 DOI: 10.1016/j.jhazmat.2012.01.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 12/17/2011] [Accepted: 01/05/2012] [Indexed: 05/06/2023]
Abstract
In this study, nano-TiO(2)-supported activated carbon (TiO(2)/AC) was developed for the microwave (MW) degradation of an azo dye, methyl orange (MO), selected as a model contaminant in aqueous solution. The effects of selected process parameters such as supported TiO(2) content, MW irradiation time, initial MO concentration, catalyst dose, and solution pH on the degradation were assessed in detail. The results showed that the supported TiO(2) on AC could be excited resulting in the production of hydroxyl radical (OH) in aqueous solution under MW irradiation, which significantly enhanced the performance of AC/MW process for the degradation of MO. Also, the supported-TiO(2)/AC displayed higher catalytic activity than AC alone under MW irradiation. By comparison, the supported-TiO(2)/AC/MW process exhibited several advantages, including high degradation rate, short irradiation time, no residual intermediates and no secondary pollution. Hence, it shows to be a promising technology for the destruction of organic contaminants in dye treatment applications.
Collapse
Affiliation(s)
- Zhaohong Zhang
- College of Environment, Liaoning University, Shenyang 110036, People's Republic of China.
| | | | | | | | | | | | | | | |
Collapse
|
81
|
Visible-light-driven N–F-codoped TiO2 powders derived from different ammonium oxofluorotitanate precursors. POWDER TECHNOL 2012. [DOI: 10.1016/j.powtec.2011.12.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
82
|
Abd Aziz A, Yong KS, Ibrahim S, Pichiah S. Enhanced magnetic separation and photocatalytic activity of nitrogen doped titania photocatalyst supported on strontium ferrite. JOURNAL OF HAZARDOUS MATERIALS 2012; 199-200:143-150. [PMID: 22100220 DOI: 10.1016/j.jhazmat.2011.10.069] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 10/22/2011] [Accepted: 10/24/2011] [Indexed: 05/31/2023]
Abstract
An enhanced ferromagnetic property, visible light active TiO(2) photocatalyst was successfully synthesized by supporting strontium ferrite (SrFe(12)O(19)) onto TiO(2) doped with nitrogen (N) and compared with N-doped TiO(2). The synthesized catalysts were further characterized with X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDS), BET surface area analysis, vibrating sample magnetometer (VSM), X-ray photon spectroscopy (XPS) and visible light spectroscopy analysis for their respective properties. The XRD and EDS revealed the structural and inorganic composition of N-TiO(2) supported on SrFe(12)O(19). The supported N-TiO(2) exhibited a strong ferromagnetic property with tremendous stability against magnetic property losses. It also resulted in reduced band gap (2.8 eV) and better visible light absorption between 400 and 800 nm compared to N-doped TiO(2). The photocatalytic activity was investigated with a recalcitrant phenolic compound namely 2,4-dichlorophenol (2,4-DCP) as a model pollutant under direct bright and diffuse sunlight exposure. A complete degradation of 2,4-DCP was achieved with an initial concentration of 50mg/L for both photocatalysts in 180 min and 270 min respectively under bright sunlight. Similarly the diffuse sunlight study resulted in complete degradation for supported N-TiO(2) and >85% degradation N-TiO(2), respectively. Finally the supported photocatalyst was separated under permanent magnetic field with a mass recovery ≈ 98% for further reuse.
Collapse
Affiliation(s)
- Azrina Abd Aziz
- Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | | | | | | |
Collapse
|
83
|
Yie Tan JZ, Zeng J, Kong D, Bian J, Zhang X. Growth of crystallized titania from the cores of amorphous tetrabutyl titanate@PVDF nanowires. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33691j] [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]
|
84
|
Bedford NM, Pelaez M, Han C, Dionysiou DD, Steckl AJ. Photocatalytic cellulosic electrospun fibers for the degradation of potent cyanobacteria toxin microcystin-LR. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31597a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
85
|
Castillo-Ledezma JH, Sánchez Salas JL, López-Malo A, Bandala ER. Effect of pH, solar irradiation, and semiconductor concentration on the photocatalytic disinfection of Escherichia coli in water using nitrogen-doped TiO2. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1579-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
86
|
Tang W, Wang Q, Zeng X, Chen X. Photocatalytic degradation on Disperse Blue with modified nano-TiO2 film electrode. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-011-1540-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
87
|
Kuo YL, Su TL, Kung FC, Wu TJ. A study of parameter setting and characterization of visible-light driven nitrogen-modified commercial TiO2 photocatalysts. JOURNAL OF HAZARDOUS MATERIALS 2011; 190:938-944. [PMID: 21555185 DOI: 10.1016/j.jhazmat.2011.04.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 04/06/2011] [Accepted: 04/06/2011] [Indexed: 05/30/2023]
Abstract
An optimal condition applied to the Taguchi method with an L(9) orthogonal array for preparing a visible-light driven nitrogen-modified TiO(2) (N-TiO(2)) photocatalyst by a simple hydrolysis method has been examined for material characteristics and a photodecolorization test of methyl blue (MB) under various visible light source (fluorescent and blue LED lamps) irradiations. Results of the material characterization showed that the absorption of prepared N-TiO(2) powder exhibited a significant extension into visible light regimes with an optical bandgap (Eg) of around 2.96 eV, which subsequently improved the visible-light photocatalytic activity of N-TiO(2) samples. The superior photocatalytic properties, the pseudo first-order reaction rate constants (k) and photodecolorization efficiency (η%) of a N-TiO(2) photocatalyst during the photodecolorization test of methyl blue (MB) under two different visible light irradiations were very evident compared to those for pure TiO(2). For photodecolorization of practical dyeing from the waste water from the dyeing and finishing industry, a higher photodecolorization efficiency of N-TiO(2) powder toward Direct blue-86 (DB-86) (Direct Fast Turquoise Blue GL) dye was also achieved.
Collapse
Affiliation(s)
- Yu-Lin Kuo
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan.
| | | | | | | |
Collapse
|
88
|
Pelaez M, de la Cruz AA, O'Shea K, Falaras P, Dionysiou DD. Effects of water parameters on the degradation of microcystin-LR under visible light-activated TiO2 photocatalyst. WATER RESEARCH 2011; 45:3787-3796. [PMID: 21575981 DOI: 10.1016/j.watres.2011.04.036] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Revised: 04/16/2011] [Accepted: 04/18/2011] [Indexed: 05/30/2023]
Abstract
A study was performed to determine the effect of pH, alkalinity, natural organic matter (NOM) and dissolved oxygen in the performance of nitrogen and fluorine doped TiO(2) (NF-TiO(2)) for the degradation of hepatotoxin microcystin-LR (MC-LR) in synthetic and natural water under visible light irradiation. The initial degradation rate of MC-LR was fastest under acidic conditions (3.50 ± 0.02 × 10(-3) μM min(-1) at pH 3.0) and decreased to 2.29 ± 0.07 × 10(-3) and 0.54 ± 0.02 × 10(-3) μM min(-1) at pH 5.7 and 7.1, respectively. Attractive forces between the opposite charged MC-LR and NF-TiO(2) are likely responsible for the enhancement in the photocatalytic decomposition of MC-LR resulting from increased interfacial adsorption. For carbonate buffered solutions, the photocatalytic activity of NF-TiO(2) was reduced when increasing the carbonate concentration up to 150 mg CaCO(3) L(-1). The scavenging of radical species by the bicarbonate ion at pH 7.1 is discussed. In the presence of NOM, the degradation rates decreased as pH and initial concentration of the NOM increased. The inhibition was higher with fulvic acid than humic acid under alkaline conditions. Oxygenated solution yields higher NF-TiO(2) photocatalytic degradation of MC-LR compared to nitrogen sparged solution at pH 5.7. The involvement of specific reactive oxygen species implicated in the photodegradation is proposed. Finally, no significant degradation is observed with various natural waters spiked with MC-LR under visible light (λ > 420 nm) but high removal was achieved with simulated solar light. This study provides a better understanding of the interactions and photocatalytic processes initiated by NF-TiO(2) under visible and solar light. The results indicate solar photocatalytic oxidation is a promising technology for the treatment of water contaminated with cyanotoxins.
Collapse
Affiliation(s)
- Miguel Pelaez
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0071, USA
| | | | | | | | | |
Collapse
|
89
|
Kontos AG, Pelaez M, Likodimos V, Vaenas N, Dionysiou DD, Falaras P. Visible light induced wetting of nanostructured N–F co-doped titania films. Photochem Photobiol Sci 2011; 10:350-4. [DOI: 10.1039/c0pp00159g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
90
|
Xiang Q, Yu J, Jaroniec M. Nitrogen and sulfur co-doped TiO2nanosheets with exposed {001} facets: synthesis, characterization and visible-light photocatalytic activity. Phys Chem Chem Phys 2011; 13:4853-61. [DOI: 10.1039/c0cp01459a] [Citation(s) in RCA: 266] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
91
|
Photocatalytic Degradation of Water Pollutants Using Nano-TiO2. ENERGY EFFICIENCY AND RENEWABLE ENERGY THROUGH NANOTECHNOLOGY 2011. [DOI: 10.1007/978-0-85729-638-2_19] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
92
|
Li X, Zhang H, Zheng X, Yin Z, Wei L. Visible light responsive N-F-codoped TiO2 photocatalysts for the degradation of 4-chlorophenol. J Environ Sci (China) 2011; 23:1919-1924. [PMID: 22432319 DOI: 10.1016/s1001-0742(10)60656-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
N-F-codoped TiO2 (NFTO) photocatalysts were synthesized by a simple sol-gel process with tetrabutyl titanate (Ti(OBu)4) as the precursor of TiO2 and ammonium fluoride (NH4F) as the source of N and F. The synthesized photocatalysts were investigated by Xray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and photodegradation reaction tests of 4-chlorophenol under visible light irradiation to understand the relationship between the structure of NFTO catalyst and corresponding photocatalytic activity. The crystal phase and particle size of catalysts were found to be largely affected by the calcination temperature. In addition, N-F-codoping could inhibit phase transition of TiO2 from anatase to rutile. The presence of N and F atoms in the lattice of TiO2 is responsible for the visible light catalytic activity. In UV-Vis DRS tests, the spectrum of NFTO exhibited red shift compared with Degussa P25 and the band gap was reduced to around 2.92 eV. Under optimal calcination temperature and dopant concentration conditions, the NFTO photocatalyst exhibited the highest activity in the photodegradation reaction tests of 4-chlorophenol under visible light irradiation with a degradation rate of 75.84%. Besides, the 5-recycle test showed that NFTO photocatalyst could be reused and its activity kept stable under visible light irradiation.
Collapse
Affiliation(s)
- Xiaohong Li
- Laboratory of Applied Catalysis, Engineering Research Centre for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
| | | | | | | | | |
Collapse
|
93
|
Antoniou MG, de la Cruz AA, Dionysiou DD. Intermediates and reaction pathways from the degradation of microcystin-LR with sulfate radicals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:7238-7244. [PMID: 20415413 DOI: 10.1021/es1000243] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Degradation of the cyanotoxin microcystin-LR (m/z 995.5) using sulfate radical-based advanced oxidation technologies (AOTs) and identification of reaction intermediates formed during treatment were investigated in this study. To the best of our knowledge this is the first study on the degradation and identification of reaction intermediates for any cyanotoxin with SO(4)(•-). Tandem mass spectrometry designated the formation of nine (as m/z) reaction intermediates with four of them (m/z 1011.5, 1027.5, 1029.5, and 1045.5) having multiple peaks in the TIC chromatogram. New peaks that were not observed with hydroxyl radical formed during photocatalytic oxidation (PCO) have been detected such as m/z 1045.5. The initially formed intermediates involved the oxidation of the unsaturated bonds of MC-LR especially the diene bonds located on the chain of the Adda amino acid. Subsequent intermediates implicated the oxidative cleavage of small functional groups (i.e., -COOH), up to the complete removal of the Adda chain. The electrophilic character of SO(4)(•-) is proven by the multihydroxylation of the aromatic ring. Toward the end of treatment, simultaneous oxidation of the Adda chain and the cyclic structure occurred without the formation of linear products.
Collapse
Affiliation(s)
- Maria G Antoniou
- Department of Civil & Environmental Engineering, University of Cincinnati, 765 Baldwin Hall, Cincinnati, Ohio 45221-0071, USA
| | | | | |
Collapse
|
94
|
|
95
|
|
96
|
Han L, Xin Y, Liu H, Ma X, Tang G. Photoelectrocatalytic properties of nitrogen doped TiO2/Ti photoelectrode prepared by plasma based ion implantation under visible light. JOURNAL OF HAZARDOUS MATERIALS 2010; 175:524-531. [PMID: 19910111 DOI: 10.1016/j.jhazmat.2009.10.037] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2009] [Revised: 10/08/2009] [Accepted: 10/10/2009] [Indexed: 05/28/2023]
Abstract
Nitrogen doped TiO(2)/Ti photoelectrodes were prepared by a sequence of anodization and plasma based ion implantation (PBII). The properties of this photoelectrode were characterized by scanning electronic microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectrometry (XPS), Ultra violet/visible light diffuse reflectance spectra (UV/vis/DRS), surface photovoltage (SPV), etc. Photoelectrocatalytic (PEC) performance of N-doped TiO(2)/Ti photoelectrode was tested under visible light irradiation. Their photocatalytic activity was evaluated by degradation of Rhodamine B (Rh.B). The results of XPS showed that nitrogen element was in form of three species, i.e. beta-N, molecular gamma-N and O-Ti-N, which existed in the lattices of TiO(2) and gaps between molecules. The results of UV/vis/DRS spectra and SPV revealed that proper doping of nitrogen could expand the response of photoelectrodes towards visible light and diminish the recombination of photo-generated holes and electrons, respectively. The photoelectrocatalytic activity of N-doped TiO(2)/Ti photoelectrodes was superior to those of undoped one under visible light region irradiation.
Collapse
Affiliation(s)
- Lei Han
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Department of Environmental Science and Engineering Harbin Institute of Technology, Huanghe Road 73, Nangang District, Harbin 150090, China.
| | | | | | | | | |
Collapse
|
97
|
Graham D, Kisch H, Lawton LA, Robertson PKJ. The degradation of microcystin-LR using doped visible light absorbing photocatalysts. CHEMOSPHERE 2010; 78:1182-1185. [PMID: 20056264 DOI: 10.1016/j.chemosphere.2009.12.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 12/01/2009] [Accepted: 12/03/2009] [Indexed: 05/28/2023]
Abstract
Microcystins are one of the primary hepatotoxic cyanotoxins released from cyanobacteria. The presence of these compounds in water has resulted in the death of both humans and domestic and wild animals. Although microcystins are chemically stable titanium dioxide photocatalysis has proven to be an effective process for the removal of these compounds in water. One problem with this process is that it requires UV light and therefore in order to develop effective commercial reactor units that could be powered by solar light it is necessary to utilize a photocatalyst that is active with visible light. In this paper we report on the application of four visible light absorbing photocatalysts for the destruction of microcystin-LR in water. The rhodium doped material proved to be the most effective material followed by a carbon-modified titania. The commercially available materials were both relatively poor photocatalysts under visible radiation while the platinum doped catalyst also displayed a limited activity for toxin destruction.
Collapse
Affiliation(s)
- Douglas Graham
- Innovation, Design and Sustainability Research Institute (IDeaS), The Robert Gordon University, Schoolhill, Aberdeen, UK
| | | | | | | |
Collapse
|
98
|
Henderson MJ, Zimny K, Blin JL, Delorme N, Bardeau JF, Gibaud A. TiO2 thin films self-assembled with a partly fluorinated surfactant template. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1124-1129. [PMID: 19754061 DOI: 10.1021/la902224t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
New TiO(2) films have been self-assembled on solid substrate by dip-coating using TiCl(4) as the titanium source and the partly fluorinated surfactant F(CF(2))(8)C(2)H(4)(OC(2)H(4))(9)OH as the liquid crystal template. By control over the dip-withdrawal speed, film thicknesses from a minimum of 43 nm were produced with rms roughnesses of 0.5-0.7 nm. The films were characterized by X-ray reflectivity, grazing incidence small-angle X-ray scattering, atomic force microscopy, contact angle measurements, and Raman spectroscopy. Their GI-SAXS patterns are characteristic of a 2-D hexagonal structure in which tubular rods of the fluorinated surfactant are packed hexagonally and aligned parallel to the substrate. Reflectivity and contact angle measurements of the as-prepared film indicate that a low-density hydrophilic TiO(2) surface presents to the air.
Collapse
Affiliation(s)
- Mark J Henderson
- Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087, Université du Maine, 72085 Le Mans Cedex 09, France
| | | | | | | | | | | |
Collapse
|
99
|
Tan K, Zhang H, Xie C, Zheng H, Gu Y, Zhang W. Visible-light absorption and photocatalytic activity in molybdenum- and nitrogen-codoped TiO2. CATAL COMMUN 2010. [DOI: 10.1016/j.catcom.2009.10.025] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
100
|
Li Y, Ma M, Wang X, Chen G. Photocatalytic activity of porous titania nanocrystals prepared by nanoscale permeation process in supercritical CO2: Effects of supercritical conditions. CATAL COMMUN 2009. [DOI: 10.1016/j.catcom.2009.07.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|