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Ateia M, Maroli A, Tharayil N, Karanfil T. The overlooked short- and ultrashort-chain poly- and perfluorinated substances: A review. Chemosphere 2019; 220:866-882. [PMID: 33395808 DOI: 10.1016/j.chemosphere.2018.12.186] [Citation(s) in RCA: 187] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 12/24/2018] [Accepted: 12/26/2018] [Indexed: 05/28/2023]
Abstract
Poly- and perfluorinated substances (PFAS) comprise more than 3000 individual compounds; nevertheless, most studies to date have focused mainly on the fate, transport and remediation of long-chain PFAS (C > 7). The main objective of this article is to provide the first critical review of the peer-reviewed studies on the analytical methods, occurrence, mobility, and treatment for ultra-short-chain PFAS (C = 2-3) and short-chain PFAS (C = 4-7). Previous studies frequently detected ultra-short-chain and short-chain PFAS in various types of aqueous environments including seas, oceans, rivers, surface/urban runoffs, drinking waters, groundwaters, rain/snow, and deep polar seas. Besides, the recent regulations and restrictions on the use of long-chain PFAS has resulted in a significant shift in the industry towards short-chain alternatives. However, our understanding of the environmental fate and remediation of these ultra-short-chain and short-chain PFAS is still fragmentary. We have also covered the handful studies involving the removal of ultra-short and short-chain PFAS and identified the future research needs.
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Affiliation(s)
- Mohamed Ateia
- Department of Environmental Engineering and Earth Science, Clemson University, SC 29634, USA
| | - Amith Maroli
- Department of Environmental Engineering and Earth Science, Clemson University, SC 29634, USA
| | - Nishanth Tharayil
- Department of Plant & Environmental Sciences, Clemson University, SC 29634, USA
| | - Tanju Karanfil
- Department of Environmental Engineering and Earth Science, Clemson University, SC 29634, USA.
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Abhilash MR, Gangadhar A, Krishnegowda J, Chikkamadaiah M, Srikantaswamy S. Hydrothermal synthesis, characterization and enhanced photocatalytic activity and toxicity studies of a rhombohedral Fe2O3nanomaterial. RSC Adv 2019; 9:25158-25169. [PMID: 35528652 PMCID: PMC9069891 DOI: 10.1039/c9ra04978a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 08/02/2019] [Indexed: 11/21/2022] Open
Abstract
The present investigation focuses on the synthesis of metal oxide nanoparticles (MONPs)viaa facile hydrothermal route.
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Affiliation(s)
| | - Akshatha Gangadhar
- Department of Studies in Environmental Science
- University of Mysore
- Mysore 570006
- India
- Centre for Materials Science and Technology
| | - Jagadish Krishnegowda
- Department of Studies in Environmental Science
- University of Mysore
- Mysore 570006
- India
- Centre for Materials Science and Technology
| | | | - Shivanna Srikantaswamy
- Department of Studies in Environmental Science
- University of Mysore
- Mysore 570006
- India
- Centre for Materials Science and Technology
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Lopes da Silva F, Laitinen T, Pirilä M, Keiski RL, Ojala S. Photocatalytic Degradation of Perfluorooctanoic Acid (PFOA) From Wastewaters by TiO2, In2O3 and Ga2O3 Catalysts. Top Catal 2017; 60:1345-58. [DOI: 10.1007/s11244-017-0819-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Chen MJ, Lo SL, Lee YC, Kuo J, Wu CH. Decomposition of perfluorooctanoic acid by ultraviolet light irradiation with Pb-modified titanium dioxide. J Hazard Mater 2016; 303:111-118. [PMID: 26513570 DOI: 10.1016/j.jhazmat.2015.10.011] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 10/02/2015] [Accepted: 10/07/2015] [Indexed: 06/05/2023]
Abstract
Perfluorooctanoic acid (PFOA, C7H15COOH) is widely used in industrial and commercial applications. It has become a global concern due to its widespread occurrence in water bodies and adverse environmental impact. PFOA could not be effectively removed by the conventional UV/TiO2 system. This study synthesized Pb-modified TiO2 catalyst and used it as a catalyst with light irradiation for PFOA decomposition. It was found that the Pb-TiO2 catalyst could produce traps to capture photo-induced electrons or holes that lead to better photocatalytic efficiencies. Rate constant values for PFOA decomposition by the UV/TiO2 and UV/Pb-TiO2 systems were determined to be 0.0158 and 0.5136 h(-1), respectively. The PFOA decomposition in the UV/Pb-TiO2 system is 32.5 times faster than that in the UV/TiO2 system. The UV/Pb-TiO2 system yielded a better performance than those of the UV/Fe-TiO2 and UV/Cu-TiO2 systems. During the reaction, PFOA decomposed stepwisely into shorter-chain perfluorocarboxylic acids and F(-).
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Affiliation(s)
- Meng-Jia Chen
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, Taiwan, ROC
| | - Shang-Lien Lo
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, Taiwan, ROC.
| | - Yu-Chi Lee
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, Taiwan, ROC
| | - Jeff Kuo
- Department of Civil and Environmental Engineering, California State University, Fullerton, CA 92834, USA
| | - Chung-Hsin Wu
- Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung, Taiwan, ROC
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Abdennouri M, Elhalil A, Farnane M, Tounsadi H, Mahjoubi F, Elmoubarki R, Sadiq M, Khamar L, Galadi A, Baâlala M, Bensitel M, El hafiane Y, Smith A, Barka N. Photocatalytic degradation of 2,4-D and 2,4-DP herbicides on Pt/TiO2 nanoparticles. Journal of Saudi Chemical Society 2015; 19:485-93. [DOI: 10.1016/j.jscs.2015.06.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Chen MJ, Lo SL, Lee YC, Huang CC. Photocatalytic decomposition of perfluorooctanoic acid by transition-metal modified titanium dioxide. J Hazard Mater 2015; 288:168-175. [PMID: 25704293 DOI: 10.1016/j.jhazmat.2015.02.004] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/08/2015] [Accepted: 02/02/2015] [Indexed: 06/04/2023]
Abstract
Transition-metal modified TiO₂ was used in a UV reactor to assist in decomposition of perfluorooctanoic acid (PFOA) in aqueous solutions. Comparing TiO₂ and two types of metal-modified TiO₂ (Fe-TiO₂ and Cu-TiO₂), Cu-TiO₂ exhibited the highest catalytic activity during PFOA decomposition and defluorination. After 12 h of reaction, the PFOA decomposition and defluorination efficiencies by the UV/Cu-TiO₂ system reached 91% and 19%, respectively. PFOA was decomposed into fluoride ions (F(-)) and shorter perfluorinated carboxylic acids (PFCAs) such as C₆ F₁₃COOH, C₅F₁₁COOH, C₄F₉COOH, C₃F₇COOH, C₂F₅COOH and CF₃COOH. The pseudo-first-order and pseudo-zero-order kinetics were used to model the decomposition and defluorination of PFOA, respectively. Rate constant values of PFOA decomposition for the UV/TiO₂, UV/Fe-TiO₂, and UV/Cu-TiO₂ systems were 0.0001, 0.0015, and 0.0031 min(-1), respectively, while rate constant values of PFOA defluorination for the UV/Fe-TiO₂, and UV/Cu-TiO₂ systems were 0.0048 and 0.0077 mg/L·min(-1), respectively. The photocatalysts were prepared by a photodeposition synthesis method and were characterized by scanning electron microscopy with energy-dispersive X-ray, X-ray diffraction and UV-vis spectrophotometry. The Fe-TiO₂ and Cu-TiO₂ catalysts exhibited considerably higher activities than that of TiO₂. The experimental results have demonstrated that the UV/Fe-TiO₂ and UV/Cu-TiO₂ systems could produce traps to capture photo-induced electrons, thereby reduce electron-hole recombination during photocatalytic reactions and consequently enhance the PFOA decomposition.
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Affiliation(s)
- Meng-Jia Chen
- Graduate Institute of Environmental Engineering, National Taiwan University 71, Chou-Shan Rd., Taipei, Taiwan, PR China
| | - Shang-Lien Lo
- Graduate Institute of Environmental Engineering, National Taiwan University 71, Chou-Shan Rd., Taipei, Taiwan, PR China.
| | - Yu-Chi Lee
- Graduate Institute of Environmental Engineering, National Taiwan University 71, Chou-Shan Rd., Taipei, Taiwan, PR China
| | - Chang-Chieh Huang
- Graduate Institute of Environmental Engineering, National Taiwan University 71, Chou-Shan Rd., Taipei, Taiwan, PR China
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8
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Sahoo C, Gupta AK. Characterization and photocatalytic performance evaluation of various metal ion-doped microstructured TiO2 under UV and visible light. J Environ Sci Health A Tox Hazard Subst Environ Eng 2015; 50:659-668. [PMID: 25901846 DOI: 10.1080/10934529.2015.1011958] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Commercially available microcrystalline TiO2 was doped with silver, ferrous and ferric ion (1.0 mol %) using silver nitrate, ferrous sulfate and ferric nitrate solutions following the liquid impregnation technology. The catalysts prepared were characterised by FESEM, XRD, FTIR, DRS, particle size and micropore analysis. The photocatalytic activity of the prepared catalysts was tested on the degradation of two model dyes, methylene blue (3,7-bis (Dimethylamino)-phenothiazin-5-ium chloride, a cationic thiazine dye) and methyl blue (disodium;4-[4-[[4-(4-sulfonatoanilino)phenyl]-[4-(4-sulfonatophenyl)azaniumylidenecyclohexa-2,5-dien-1-ylidene]methyl]anilino]benzene sulfonate, an anionic triphenyl methane dye) under irradiation by UV and visible light in a batch reactor. The efficiency of the photocatalysts under UV and visible light was compared to ascertain the light range for effective utilization. The catalysts were found to have the anatase crystalline structure and their particle size is in a range of 140-250 nm. In the case of Fe(2+) doped TiO2 and Fe(3+) doped TiO2, there was a greater shift in the optical absorption towards the visible range. Under UV light, Ag(+) doped TiO2 was the most efficient catalyst and the corresponding decolorization was more than 99% for both the dyes. Under visible light, Fe(3+) doped TiO2 was the most efficient photocatalyst with more than 96% and 90% decolorization for methylene blue and methyl blue, respectively. The kinetics of the reaction under both UV and visible light was investigated using the Langmuir-Hinshelwood pseudo-first-order kinetic model. Kinetic measurements confirmed that, Ag(+) doped TiO2 was most efficient in the UV range, while Fe(3+) doped TiO2 was most efficient in the visible range.
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Affiliation(s)
- Chittaranjan Sahoo
- a Environmental Engineering Division , Department of Civil Engineering , Indian Institute of Technology , Kharagpur , India
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Rajamannan B, Mugundan S, Viruthagiri G, Shanmugam N, Gobi R, Praveen P. Preparation, structural and morphological studies of Ni doped titania nanoparticles. Spectrochim Acta A Mol Biomol Spectrosc 2014; 128:218-224. [PMID: 24667428 DOI: 10.1016/j.saa.2014.02.116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 02/04/2014] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
TiO2 nanoparticles doped with different weight percentages (4%, 8%, 12% and 16%) of nickel contents were prepared by a modified sol-gel method using Titanium tetra iso propoxide and nickel nitrate as precursors and 2-propanol as a solvent. X-ray diffraction studies show that the as prepared and annealed products show anatase structure with average particle sizes running between of 8 and 16 nm. FTIR results demonstrate the presence of strong chemical bonding at the interface of TiO2 nanoparticles. The optical properties of bare and doped samples were carried out using UV-DRS and photoluminescence measurements. The surface morphology and the element constitution of the nickel doped TiO2 nanoparticles were studied by scanning electron microscope attached with energy dispersive X-ray spectrometer arrangement. The non linear optical properties of the products were confirmed by Kurtz second harmonic generation (SHG) test and the output power generated by the nanoparticle was compared with that of potassium di hydrogen phosphate (KDP).
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Affiliation(s)
- B Rajamannan
- Department of Engineering Physics (FEAT), Annamalai University, Annamalainagar 608002, India.
| | - S Mugundan
- Department of Physics, Annamalai University, Annamalainagar 608002, India
| | - G Viruthagiri
- Department of Physics, Annamalai University, Annamalainagar 608002, India
| | - N Shanmugam
- Department of Physics, Annamalai University, Annamalainagar 608002, India
| | - R Gobi
- Department of Physics, Annamalai University, Annamalainagar 608002, India
| | - P Praveen
- Department of Physics, Annamalai University, Annamalainagar 608002, India
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Praveen P, Viruthagiri G, Mugundan S, Shanmugam N. Structural, optical and morphological analyses of pristine titanium di-oxide nanoparticles--synthesized via sol-gel route. Spectrochim Acta A Mol Biomol Spectrosc 2014; 117:622-9. [PMID: 24113014 DOI: 10.1016/j.saa.2013.09.037] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 08/31/2013] [Accepted: 09/07/2013] [Indexed: 05/27/2023]
Abstract
Pure titanium di-oxide nanoparticles (TiO2) were synthesized by sol-gel technique at room temperature with appropriate reactants. The synthesis of anatase phase TiO2 nanoparticles was achieved by tetraisopropyl orthotitanate and 2-propanol as common starting materials and the product was annealed at 450 °C for 4 h. The synthesized product was characterized by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), UV-VIS-Diffuse reflectance spectroscopy (DRS), Photoluminescence (PL) spectroscopy and Scanning electron microscopy (SEM) with Energy dispersive X-ray (EDX) analysis. XRD pattern confirmed the crystalline nature and tetragonal structure of synthesized composition. Average grain size was determined from X-ray line broadening, using the Debye-Scherrer relation. The functional groups present in the sample were identified by FTIR spectroscopy. Diffuse reflectance measurement indicated an absorption band edge on UV-region. The allowed direct and indirect band gap energies, as well as the crystallite size of pure TiO2 nanoparticles are calculated from DRS analysis. The microstructure and elemental identification were done by SEM with EDX analysis.
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Affiliation(s)
- P Praveen
- Department of Physics, Annamalai University, Annamalainagar 608002, Tamilnadu, India
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11
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Siuzdak K, Sawczak M, Klein M, Nowaczyk G, Jurga S, Cenian A. Preparation of platinum modified titanium dioxide nanoparticles with the use of laser ablation in water. Phys Chem Chem Phys 2014; 16:15199-206. [DOI: 10.1039/c4cp01923g] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the preparation method of nanocrystalline titanium dioxide modified with platinum by using nanosecond laser ablation in liquid (LAL).
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Affiliation(s)
- K. Siuzdak
- Center for Plasma and Laser Engineering
- The Szewalski Institute of Fluid Flow Machinery
- 80-231 Gdansk, Poland
| | - M. Sawczak
- Center for Plasma and Laser Engineering
- The Szewalski Institute of Fluid Flow Machinery
- 80-231 Gdansk, Poland
| | - M. Klein
- Center for Plasma and Laser Engineering
- The Szewalski Institute of Fluid Flow Machinery
- 80-231 Gdansk, Poland
- Faculty of Applied Physics and Mathematics
- Gdansk University of Technology
| | - G. Nowaczyk
- The Nanobiomedical Centre
- 61-614 Poznan, Poland
| | - S. Jurga
- The Nanobiomedical Centre
- 61-614 Poznan, Poland
| | - A. Cenian
- Center for Plasma and Laser Engineering
- The Szewalski Institute of Fluid Flow Machinery
- 80-231 Gdansk, Poland
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Praveen P, Viruthagiri G, Mugundan S, Shanmugam N. Sol-gel synthesis and characterization of pure and manganese doped TiO2 nanoparticles--a new NLO active material. Spectrochim Acta A Mol Biomol Spectrosc 2013; 120:548-557. [PMID: 24374482 DOI: 10.1016/j.saa.2013.12.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 11/30/2013] [Accepted: 12/04/2013] [Indexed: 06/03/2023]
Abstract
Pure and Manganese (4%, 8%, 12% and 16%) doped titanium di-oxide (Mn-TiO2) nanoparticles were synthesized by sol-gel technique. The preparation of pure and Mn doped TiO2 nanoparticles were achieved by tetra-isopropyl orthotitanate and 2-propanol as common starting materials and the products were annealed at 450°C and 750°C to get anatase and rutile phases, respectively. The prepared materials were characterized by X-ray diffraction analysis (XRD), Fourier transform infra-red spectroscopy (FT-IR), UV-VIS-Diffuse reflectance spectroscopy (DRS), Photoluminescence (PL) spectroscopy, Scanning electron microscopy (SEM) with Energy dispersive X-ray analysis (EDX) and Kurtz powder second harmonic generation (SHG) test. XRD patterns confirmed the crystalline nature and tetragonal structure of synthesized materials. The functional groups present in the samples were identified by FTIR study. The allowed direct and indirect band gap energies, as well as the crystallite sizes of obtained nanoparticles were calculated from DRS analysis. Microstructures and elemental identification were done by SEM with EDX analysis. The existence of SHG signals was observed using Nd: YAG laser with fundamental wavelength of 1064 nm. The products were found to be transparent in the entire visible region with cut-off wavelengths within the UV region confirms its suitability for device fabrications.
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Affiliation(s)
- P Praveen
- Department of Physics, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India
| | - G Viruthagiri
- Department of Physics, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India.
| | - S Mugundan
- Department of Physics, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India
| | - N Shanmugam
- Department of Physics, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India
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Li Z, Zhang P, Shao T, Wang J, Jin L, Li X. Different nanostructured In₂O₃ for photocatalytic decomposition of perfluorooctanoic acid (PFOA). J Hazard Mater 2013; 260:40-46. [PMID: 23742955 DOI: 10.1016/j.jhazmat.2013.04.042] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 04/23/2013] [Accepted: 04/26/2013] [Indexed: 06/02/2023]
Abstract
Perfluorooctanoic acid (PFOA), an emerging persistent organic pollutant, recently receives worldwide concerns including methods for its efficient decomposition. Three kinds of nanostructured In₂O₃ materials including porous microspheres, nanocubes and nanoplates were obtained by dehydration of the corresponding In(OH)₃ nanostructures at 500 °C for 2 h. The In(OH)₃ nanostructures with different morphologies were solvothermally synthesized by using different mixed solvents. As-obtained In₂O₃ nanomaterials showed great photocatalytic activity for PFOA decomposing. The decomposition rates of PFOA by different In₂O₃ materials, i.e. porous microspheres, nanoplates and nanocubes were 74.7, 41.9 and 17.3 times as fast as that by P25 TiO2, respectively. The In₂O₃ porous microspheres showed the highest activity, by which the half-life of PFOA was shortened to 5.3 min. The roles of surface oxygen vacancies on the adsorption and photocatalytic decomposition of PFOA were discussed, and it was found that In₂O₃ materials with higher oxygen vacancy defects show better activity.
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Affiliation(s)
- Zhenmin Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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Pang YL, Abdullah AZ. Effect of low Fe3+ doping on characteristics, sonocatalytic activity and reusability of TiO2 nanotubes catalysts for removal of Rhodamine B from water. J Hazard Mater 2012; 235-236:326-335. [PMID: 22939090 DOI: 10.1016/j.jhazmat.2012.08.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 08/02/2012] [Accepted: 08/03/2012] [Indexed: 05/27/2023]
Abstract
Fe-doped titanium dioxide (TiO(2)) nanotubes were prepared using sol-gel followed by hydrothermal methods and characterized using various methods. The sonocatalytic activity was evaluated based on oxidation of Rhodamine B under ultrasonic irradiation. Iron ions (Fe(3+)) might incorporate into the lattice and intercalated in the interlayer spaces of TiO(2) nanotubes. The catalysts showed narrower band gap energies, higher specific surface areas, more active surface oxygen vacancies and significantly improved sonocatalytic activity. The optimum Fe doping at Fe:Ti=0.005 showed the highest sonocatalytic activity and exceeded that of un-doped TiO(2) nanotubes by a factor of 2.3 times. It was believed that Fe(3+) doping induced the formation of new states close to the valence band and conduction bands and accelerated the separation of charge carriers. Leached Fe(3+) could catalyze Fenton-like reaction and led to an increase in the hydroxyl radical (OH) generation. Fe-doped TiO(2) nanotubes could retain high degradation efficiency even after being reused for 4 cycles with minimal loss of Fe from the surface of the catalyst.
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Affiliation(s)
- Yean Ling Pang
- School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, 14300 Penang, Malaysia
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Annadhasan M, Selvam K, Swaminathan M. A Combined-Redox Synthesis of 2-Alkylbenzimidazoles from 2-Nitroanilines by Semiconductor Photocatalysis. SYNTHETIC COMMUN 2012. [DOI: 10.1080/00397911.2010.541587] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- M. Annadhasan
- a Department of Chemistry , Annamalai University , Annamalainagar , India
| | - K. Selvam
- a Department of Chemistry , Annamalai University , Annamalainagar , India
| | - M. Swaminathan
- a Department of Chemistry , Annamalai University , Annamalainagar , India
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Chen YC, Lo SL, Kuo J. Effects of titanate nanotubes synthesized by a microwave hydrothermal method on photocatalytic decomposition of perfluorooctanoic acid. Water Res 2011; 45:4131-4140. [PMID: 21703658 DOI: 10.1016/j.watres.2011.05.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 05/07/2011] [Accepted: 05/21/2011] [Indexed: 05/31/2023]
Abstract
Titanate nanotubes (TNTs) were used to remove perfluorooctanoic acid (PFOA) from aqueous solutions in this study. Direct photolysis of PFOA by a 254-nm UV light (400 W) was found effective to decompose PFOA without presence of photocatalysts. Shorter-chain perfluorocarboxylic acids (PFCAs) and fluoride ions were formed during photodecomposition. Addition of TNTs as photocatalysts did not greatly enhance photocatalytic decomposition of PFOA. TNTs mainly act as adsorbents to adsorb PFOA and form TNT-PFOA complexes. It suggested that sodium ions and oxygen atoms on the surfaces of TNTs play important roles in PFOA adsorption. X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) analyses indicated that ion-exchange, electrostatic interaction, and hydrophobic interaction all participated in the photocatalytic reaction of PFOA by TNTs.
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Affiliation(s)
- Ying-Chu Chen
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan, ROC
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Velmurugan R, Sreedhar B, Swaminathan M. Nanostructured AgBr loaded TiO2: An efficient sunlight active photocatalyst for degradation of Reactive Red 120. Chem Cent J 2011; 5:46. [PMID: 21801445 PMCID: PMC3159096 DOI: 10.1186/1752-153x-5-46] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Accepted: 07/30/2011] [Indexed: 11/10/2022] Open
Abstract
The AgBr loaded TiO2 catalyst was prepared by a feasible approach with AgBr and tetraisopropyl orthotitanate and characterized by BET surface area measurement, diffuse reflectance spectra (DRS), scanning electron microscope (SEM), energy dispersive spectra (EDS), X-ray diffraction (XRD), transmission electron microscope (TEM) and atomic force microscope (AFM) analysis. The results of characterization reveal that AgBr loaded TiO2 has a nanostructure. Formation of the nanostructure in AgBr loaded TiO2 results in substantial shifting of the absorption edge of TiO2 to red and enhancement of visible light absorption. Electrochemical impedance spectroscopy measurements reveal that AgBr loaded TiO2 has a higher photoconductivity than prepared TiO2 due to higher separation efficiency of electron-hole pairs. Cyclic voltammetric studies reveal enhanced conductivity in AgBr loaded TiO2, which causes an increase in its photocatalytic activity. AgBr loaded TiO2 exhibited a higher photocatalytic activity than TiO2-P25 and prepared TiO2 in the photodegradation of Reactive Red 120 (RR 120).
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Velmurugan R, Selvam K, Krishnakumar B, Swaminathan M. An efficient reusable and antiphotocorrosive nano ZnO for the mineralization of Reactive Orange 4 under UV-A light. Sep Purif Technol 2011. [DOI: 10.1016/j.seppur.2011.04.018] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Krishnakumar B, Swaminathan M. A convenient method for the N-formylation of amines at room temperature using TiO2-P25 or sulfated titania. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2010.11.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Wang BB, Cao MH, Tan ZJ, Wang LL, Yuan SH, Chen J. Photochemical decomposition of perfluorodecanoic acid in aqueous solution with VUV light irradiation. J Hazard Mater 2010; 181:187-192. [PMID: 20557997 DOI: 10.1016/j.jhazmat.2010.04.115] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2009] [Revised: 04/29/2010] [Accepted: 04/29/2010] [Indexed: 05/29/2023]
Abstract
The photochemical decomposition of perfluorodecanoic acid (PFDeA) in water in the presence of persulfate ion (S(2)O(8)(2-)) and sulfur ion (S(2-)) was investigated under vacuum ultraviolet (VUV) light irradiation. PFDeA was decomposed under VUV light irradiation. With the addition of S(2)O(8)(2-) or S(2-), the photo-decomposition and defluorination of PFDeA were enhanced significantly. Sulfate radical anion (SO(4)(*-)) generated from photolysis of S(2)O(8)(2-) initiated PFDeA oxidation. While the S(2-) ion, acting as a *OH scavenger, enhanced the role of reduction pathway induced by aqueous electrons (e(aq)(-)). The shorter-chain perfluorocarboxylic acids (PFCAs), formed in a stepwise manner from longer-chain PFCAs, were identified as products by HPLC/MS.
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Affiliation(s)
- B B Wang
- Environmental Science Research Institution, College of Environment Science and Engineering, Huazhong University of Science and Technology, Wuhan, PR China
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Estrellan CR, Salim C, Hinode H. Photocatalytic decomposition of perfluorooctanoic acid by iron and niobium co-doped titanium dioxide. J Hazard Mater 2010; 179:79-83. [PMID: 20236761 DOI: 10.1016/j.jhazmat.2010.02.060] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Revised: 02/18/2010] [Accepted: 02/18/2010] [Indexed: 05/28/2023]
Abstract
The photocatalytic decomposition of perfluorooctanoic acid (PFOA) in aqueous solution using Fe and Nb co-doped TiO(2) (Fe:Nb-TiO(2)) prepared by sol-gel method was investigated. The photocatalytic activity of Fe:Nb-TiO(2) towards PFOA degradation was compared to that of pure TiO(2) synthesized using the same method, and that of the commercially available TiO(2) photocatalyst, Aeroxide TiO(2) P25 (AO-TiO(2) P25). The photocatalysts were characterized by XRD, DRS, BET-N(2) adsorption isotherm, and SEM-EDX techniques and the data were correlated to the photocatalytic activity. Fe:Nb-TiO(2) showed the highest activity compared to the undoped TiO(2) and the commercially available TiO(2). Such activity was attributable to the effects of co-doping both on the physico-chemical properties and surface interfacial charge transfer mechanisms. Perfluorocarboxylic acids (PFCAs) with shorter carbon chain length and fluoride ions were identified as photocatalytic reaction intermediates and products.
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Affiliation(s)
- Carl Renan Estrellan
- Department of International Development Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
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Krishnakumar B, Velmurugan R, Jothivel S, Swaminathan M. An efficient protocol for the green synthesis of quinoxaline and dipyridophenazine derivatives at room temperature using sulfated titania. CATAL COMMUN 2010. [DOI: 10.1016/j.catcom.2010.04.021] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Ravichandran L, Selvam K, Swaminathan M. Highly efficient activated carbon loaded TiO2 for photo defluoridation of pentafluorobenzoic acid. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcata.2009.10.029] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Selvam K, Krishnakumar B, Velmurugan R, Swaminathan M. A simple one pot nano titania mediated green synthesis of 2-alkylbenzimidazoles and indazole from aromatic azides under UV and solar light. CATAL COMMUN 2009. [DOI: 10.1016/j.catcom.2009.10.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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