51
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Trevisan V, Ghedini E, Signoretto M, Pinna F, Bianchi C. Quantitative determination of carbon in titania photocatalysts by temperature programmed oxidation method. Microchem J 2014. [DOI: 10.1016/j.microc.2013.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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52
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Ma H, Liu Y, Fu Y, Yu C, Dong X, Zhang X, Zhang X, Xue W. Improved Photocatalytic Activity of Copper Heterostructure Composites (Cu–Cu2O–CuO/AC) Prepared by Simple Carbothermal Reduction. Aust J Chem 2014. [DOI: 10.1071/ch13456] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cu–Cu2O–CuO/activated carbon heterostructure composites with visible-light activity have been successfully synthesized by a simple carbothermal reduction procedure using CuSO4 as a single precursor. The resultant samples were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy measurements. The results showed that the Cu–Cu2O–CuO composites with size less than 10 nm dispersed well on the surface of activated carbon. Activated carbon played both a reducing agent and support role in the formation of Cu–Cu2O–CuO/activated carbon heterostructure composites. X-ray photoelectron spectroscopy analysis suggests that the outside of the nanoparticles is CuO and the inside of the nanoparticles is Cu metal and Cu2O. Moreover, the composition of Cu–Cu2O–CuO/activated carbon composites can be tailored by varying the Cu loading, heat-treatment temperature, and heat-treatment time. The photocatalytic activities of the catalysts were investigated by degrading reactive brilliant blue KN-R under visible-light irradiation. The Cu–Cu2O–CuO/activated carbon heterostructure composites showed excellent photocatalytic activity compared with other catalysts (pure CuO, Cu2O, Cu2O/activated carbon, CuO/activated carbon, and Cu2O–CuO/activated carbon), which is ascribed to synergistic action between the activated carbon support and photoactive copper species, and the presence of interfacial structures such as a Cu2O/CuO heterostructure, Cu/Cu2O (or CuO) Schottky barrier, and Cu2O/Cu/CuO ohmic heterojunction.
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Enhanced water splitting by Fe2O3-TiO2-FTO photoanode with modified energy band structure. ScientificWorldJournal 2013; 2013:723201. [PMID: 24501585 PMCID: PMC3899744 DOI: 10.1155/2013/723201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Accepted: 11/24/2013] [Indexed: 11/19/2022] Open
Abstract
The effect of TiO2 layer applied to the conventional Fe2O3/FTO photoanode to improve the photoelectrochemical performance was assessed from the viewpoint of the microstructure and energy band structure. Regardless of the location of the TiO2 layer in the photoanodes, that is, Fe2O3/TiO2/FTO or TiO2/Fe2O3/FTO, high performance was obtained when α-Fe2O3 and H-TiNT/anatase-TiO2 phases existed in the constituent Fe2O3 and TiO2 layers after optimized heat treatments. The presence of the Fe2O3 nanoparticles with high uniformity in the each layer of the Fe2O3/TiO2/FTO photoanode achieved by a simple dipping process seemed to positively affect the performance improvement by modifying the energy band structure to a more favorable one for efficient electrons transfer. Our current study suggests that the application of the TiO2 interlayer, together with α-Fe2O3 nanoparticles present in the each constituent layers, could significantly contribute to the performance improvement of the conventional Fe2O3 photoanode.
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54
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Shi Z, Zhou M, Zheng D, Liu H, Yao S. Preparation of Ce-doped TiO2Hollow Fibers and Their Photocatalytic Degradation Properties for Dye Compound. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201200212] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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55
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Gulyas H, Argáez ASO, Kong F, Jorge CL, Eggers S, Otterpohl R. Combining activated carbon adsorption with heterogeneous photocatalytic oxidation: lack of synergy for biologically treated greywater and tetraethylene glycol dimethyl ether. ENVIRONMENTAL TECHNOLOGY 2013; 34:1393-1403. [PMID: 24191472 PMCID: PMC3701936 DOI: 10.1080/09593330.2012.751129] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 11/15/2012] [Indexed: 06/02/2023]
Abstract
The aim of the study was to evaluate whether the addition of activated carbon in the photocatalytic oxidation of biologically pretreated greywater and of a polar aliphatic compound gives synergy, as previously demonstrated with phenol. Photocatalytic oxidation kinetics were recorded with fivefold concentrated biologically pretreated greywater and with aqueous tetraethylene glycol dimethyl ether solutions using a UV lamp and the photocatalyst TiO2 P25 in the presence and the absence of powdered activated carbon. The synergy factor, SF, was quantified as the ratio of photocatalytic oxidation rate constant in the presence of powdered activated carbon to the rate constant without activated carbon. No synergy was observed for the greywater concentrate (SF approximately 1). For the aliphatic compound, tetraethylene glycol dimethyl ether, addition of activated carbon actually had an inhibiting effect on photocatalysis (SF < 1), while synergy was confirmed in reference experiments using aqueous phenol solutions. The absence of synergy for the greywater concentrate can be explained by low adsorbability of its organic constituents by activated carbon. Inhibition of the photocatalytic oxidation of tetraethylene glycol dimethyl ether by addition of powdered activated carbon was attributed to shading of the photocatalyst by the activated carbon particles. It was assumed that synergy in the hybrid process was limited to aromatic organics. Regardless of the lack of synergy in the case of biologically pretreated greywater, the addition of powdered activated carbon is advantageous since, due to additional adsorptive removal of organics, photocatalytic oxidation resulted in a 60% lower organic concentration when activated carbon was present after the same UV irradiation time.
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Affiliation(s)
- Holger Gulyas
- Institute of Wastewater Management and Water Protection, Hamburg University of Technology, Hamburg, Germany.
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56
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Foam-structured activated carbon-ceramic as TiO2 supports for photocatalytic degradation of phenol. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-2233-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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57
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Shand M, Anderson JA. Aqueous phase photocatalytic nitrate destruction using titania based materials: routes to enhanced performance and prospects for visible light activation. Catal Sci Technol 2013. [DOI: 10.1039/c3cy20851f] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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58
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Yao S, Zhang Y, Shi Z, Wang S. Physical properties of nano-titania hollow fibers and their photocatalytic activity in the decomposition of phenol. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2012. [DOI: 10.1134/s0036024413010263] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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59
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Wei W, Yu C, Zhao Q, Li G, Wan Y. Improvement of the Visible-Light Photocatalytic Performance of TiO2by Carbon Mesostructures. Chemistry 2012; 19:566-77. [DOI: 10.1002/chem.201202691] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Indexed: 11/08/2022]
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60
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Toyoda M, Tsumura T, Tryba B, Mozia S, Janus M, Morawski A, Inagaki M. Carbon Materials in Photocatalysis. ACTA ACUST UNITED AC 2012. [DOI: 10.1201/b12960-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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61
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Jamil TS, Ghaly MY, Fathy NA, Abd el-halim TA, Österlund L. Enhancement of TiO2 behavior on photocatalytic oxidation of MO dye using TiO2/AC under visible irradiation and sunlight radiation. Sep Purif Technol 2012. [DOI: 10.1016/j.seppur.2012.06.018] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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62
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Di Paola A, García-López E, Marcì G, Palmisano L. A survey of photocatalytic materials for environmental remediation. JOURNAL OF HAZARDOUS MATERIALS 2012; 211-212:3-29. [PMID: 22169148 DOI: 10.1016/j.jhazmat.2011.11.050] [Citation(s) in RCA: 331] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Revised: 11/14/2011] [Accepted: 11/14/2011] [Indexed: 05/14/2023]
Abstract
Heterogeneous photocatalysis is an advanced oxidation process which has been the subject of a huge amount of studies related to air cleaning and water purification. All these processes have been carried out mainly by using TiO(2)-based materials as the photocatalysts and ca. 75% of the articles published in the last 3 years is related to them. This review illustrates the efforts in the search of alternative photocatalysts that are not based on TiO(2), with some exceptions concerning particularly innovative modifications as nanoassembled TiO(2) or TiO(2) composites with active carbon, graphite and fullerene. Papers reporting preparation, characterization and testing of binary, ternary and quaternary compounds, have been reviewed. Despite many of these photocatalysts being effective for the photodecomposition of many pollutants, most of them do not allow a complete mineralization of the starting compounds, differently from TiO(2).
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Affiliation(s)
- Agatino Di Paola
- Dipartimento di Ingegneria Elettrica, Elettronica e delle Telecomunicazioni, di tecnologie Chimiche, Automatica e modelli Matematici (DIEETCAM), Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
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63
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Saleh TA, Gupta VK. Photo-catalyzed degradation of hazardous dye methyl orange by use of a composite catalyst consisting of multi-walled carbon nanotubes and titanium dioxide. J Colloid Interface Sci 2012; 371:101-6. [PMID: 22297021 DOI: 10.1016/j.jcis.2011.12.038] [Citation(s) in RCA: 846] [Impact Index Per Article: 70.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Revised: 12/05/2011] [Accepted: 12/12/2011] [Indexed: 11/24/2022]
Abstract
The high rate of electron/hole pair recombination reduces the quantum yield of the processes with TiO(2) and represents its major drawback. Adding a co-adsorbent increases the photocatalytic efficiency of TiO(2). In order to hybridize the photocatalytic activity of TiO(2) with the adsorptivity of carbon nanotube, a composite of multi-walled carbon nanotubes and titanium dioxide (MWCNT/TiO(2)) has been synthesized. The composite was characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared absorption spectroscopy (FTIR), and diffuse reflectance UV-vis spectroscopy. The catalytic activity of this composite material was investigated by application of the composite for the degradation of methyl orange. It was observed that the composite exhibits enhanced photocatalytic activity compared with TiO(2). The enhancement in photocatalytic performance of the MWCNT/TiO(2) composite is explained in terms of recombination of photogenerated electron-hole pairs. In addition, MWCNT acts as a dispersing agent preventing TiO(2) from agglomerating activity during the catalytic process, providing a high catalytically active surface area. This work adds to the global discussion of how CNTs can enhance the efficiency of catalysts.
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Affiliation(s)
- Tawfik A Saleh
- Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
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64
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Haro M, Velasco LF, Ania CO. Carbon-mediated photoinduced reactions as a key factor in the photocatalytic performance of C/TiO2. Catal Sci Technol 2012. [DOI: 10.1039/c2cy20270k] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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65
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Matos J, Nahas C, Rojas L, Rosales M. Synthesis and characterization of activated carbon from sawdust of Algarroba wood. 1. Physical activation and pyrolysis. JOURNAL OF HAZARDOUS MATERIALS 2011; 196:360-369. [PMID: 21955661 DOI: 10.1016/j.jhazmat.2011.09.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 09/02/2011] [Accepted: 09/10/2011] [Indexed: 05/31/2023]
Abstract
Synthesis of activated carbon (AC) from sawdust of Algarroba wood was performed as a function of the temperature under CO(2) and N(2) flow. Characterization was performed by adsorption-desorption N(2) isotherms, FTIR, XPS and SEM. Functional acid or basic groups were detected on the surface of AC. For both studied atmospheres, the maximum value of surface area was obtained at 800°C. A monotonic correlation between temperature and mean pore diameter was detected being the higher the activation temperature the lower the mean pore width of AC. Ultramicroporous AC with pore diameters of 6.7 Å and 5.3 Å were obtained at 900°C under CO(2) and N(2) flow, respectively. It can be concluded that pore diameter and the functionalization of the AC surface can be controlled easily controlling the temperature of activation, independently of the gas atmosphere. The present results suggest that waste biomass is a potential source for the synthesis of carbon materials with potential novel applications.
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Affiliation(s)
- Juan Matos
- Engineering of Materials and Nanotechnology Centre, Venezuelan Institute for Scientific Research (IVIC) 20632, Caracas 1020-A, Venezuela.
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66
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YUAN RUSHENG, ZHENG JINGTANG, GUAN RONGBO. THE CHANGES IN SURFACE CHARACTERISTICS AND PHOTOCATALYTIC ACTIVITY OF TiO2 LOADED ON ACTIVATED CARBON FIBERS AFTER UV IRRADIATION. INTERNATIONAL JOURNAL OF NANOSCIENCE 2011. [DOI: 10.1142/s0219581x06005388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
TiO 2 loaded on activated carbon fibers (ACF) was performed by using epoxy resin as the precursor of the link between them, followed by calcination at 460°C in N 2 atmosphere, and the changes in surface characteristics and photocatalytic activity after UV irradiation were investigated in detail. After UV irradiation, the pore structure and surface morphology of TiO 2-loaded ACF ( TiO 2/ ACF ) kept unchanged. The UV-Vis spectrum shifted toward shorter wavelengths than that before UV irradiation. XPS results showed that the hydroxyl and C – O groups increased, resulting in an increase in hydrophilicity of TiO 2/ ACF . All these changes caused the increased photocatalytic activity for methylene blue, and the activity was maintained without any decrease when it was used repeatedly. Even at the sixth cycle, its amount of MB removal was still slightly higher than suspended P25.
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Affiliation(s)
- RUSHENG YUAN
- Research Institute of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University Fuzhou 350002, P. R. China
| | - JINGTANG ZHENG
- The State Key Laboratory of Heavy Oil Processing, University of Petroleum, Dongying 257061, P. R. China
| | - RONGBO GUAN
- The State Key Laboratory of Heavy Oil Processing, University of Petroleum, Dongying 257061, P. R. China
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67
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68
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McManamon C, Holmes JD, Morris MA. Improved photocatalytic degradation rates of phenol achieved using novel porous ZrO2-doped TiO2 nanoparticulate powders. JOURNAL OF HAZARDOUS MATERIALS 2011; 193:120-127. [PMID: 21813241 DOI: 10.1016/j.jhazmat.2011.07.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Revised: 07/06/2011] [Accepted: 07/08/2011] [Indexed: 05/31/2023]
Abstract
This paper studies the photocatalytic degradation of phenol using zirconia-doped TiO(2) nanoparticles. ZrO(2) was chosen due to its promising results during preliminary studies. Particles smaller than 10nm were synthesised and doped with quantities of ZrO(2) ranging from 0.5 to 4% (molar metal content). Particles were calcined at different temperatures to alter the TiO(2) structure, from anatase to rutile, in order to provide an ideal ratio of the two phases. Powder X-ray diffraction (PXRD) analysis was used to examine the transformation between anatase and rutile. Degradation of phenol was carried out using a 40 W UV bulb at 365 nm and results were measured by UV-vis spectrometry. TEM images were obtained and show the particles exhibit a highly ordered structure. TiO(2) doped with 1% ZrO(2) (molar metal content) calcined at 700 °C proved to be the most efficient catalyst. This is due to an ideal anatase:rutlie ratio of 80:20, a large surface area and the existence of stable electron-hole pairs. ZrO(2) doping above the optimum loading acted as an electron-hole recombination centre for electron-hole pairs and reduced photocatalytic degradation. Synthesised photocatalysts compared favourably to the commercially available photocatalyst P25. The materials also demonstrated the ability to be recycled with similar results to those achieved on fresh material after 5 uses.
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Affiliation(s)
- Colm McManamon
- Department of Chemistry, Supercritical Fluid Centre and Materials Section, University College Cork, Cork, Ireland.
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69
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Wang C, Ao Y, Wang P, Hou J, Qian J. Preparation of cerium and nitrogen co-doped titania hollow spheres with enhanced visible light photocatalytic performance. POWDER TECHNOL 2011. [DOI: 10.1016/j.powtec.2011.03.015] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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70
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Synthesis and Characterization of Titania Nanoparticles on the Surface of Microporous Perlite Using Sol–Gel Method: Influence of Titania Precursor on Characteristics. J Inorg Organomet Polym Mater 2011. [DOI: 10.1007/s10904-011-9500-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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71
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Xu J. Synergy effect on a suspended mixture of ceria and activated carbon for the photocatalytic degradation of phenol. POWDER TECHNOL 2011. [DOI: 10.1016/j.powtec.2011.02.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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72
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Sampaio MJ, Silva CG, Marques RR, Silva AM, Faria JL. Carbon nanotube–TiO2 thin films for photocatalytic applications. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.11.081] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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73
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74
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Basha S, Barr C, Keane D, Nolan K, Morrissey A, Oelgemöller M, Tobin JM. On the adsorption/photodegradation of amoxicillin in aqueous solutions by an integrated photocatalytic adsorbent (IPCA): experimental studies and kinetics analysis. Photochem Photobiol Sci 2011; 10:1014-22. [DOI: 10.1039/c0pp00368a] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Shi Z, Yao S, Sui C. Application of fly ash supported titanium dioxide for phenol photodegradation in aqueous solution. Catal Sci Technol 2011. [DOI: 10.1039/c1cy00019e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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76
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Synergy of adsorption and visible light photocatalysis to decolor methyl orange by activated carbon/nanosized CdS/chitosan composite. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/s11771-010-0623-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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77
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Velasco LF, Tsyntsarski B, Petrova B, Budinova T, Petrov N, Parra JB, Ania CO. Carbon foams as catalyst supports for phenol photodegradation. JOURNAL OF HAZARDOUS MATERIALS 2010; 184:843-848. [PMID: 20875925 DOI: 10.1016/j.jhazmat.2010.08.118] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 07/20/2010] [Accepted: 08/31/2010] [Indexed: 05/29/2023]
Abstract
A carbon foam using coal tar pitch as precursor was prepared and investigated as support for titanium oxide for the photocatalytic degradation of phenol. The performance of the carbon foam/titania composite was compared to those of unsupported titania and other activated carbon composites from the literature. The photodegradation rate of phenol over the catalysts under UV illumination was fitted to the Langmuir-Hinshelwood model; data showed that the apparent rate constant of the carbon foam supported titania was almost three times larger than that of bare titania, and comparable to that of other carbon supported composites. Considering the low porous features of the carbon foam, this suggests that large surface area supports are not essential to achieve high degradation rates and efficiencies. Moreover, when titania is supported on the carbon foam large amounts of catechol are detected in solution after UV irradiation, indicating a better degradation efficiency.
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Affiliation(s)
- L F Velasco
- Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 9, 1113 Sofia, Bulgaria; Instituto Nacional del Carbón (INCAR), CSIC, Oviedo 33080, Spain
| | - B Tsyntsarski
- Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 9, 1113 Sofia, Bulgaria
| | - B Petrova
- Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 9, 1113 Sofia, Bulgaria
| | - T Budinova
- Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 9, 1113 Sofia, Bulgaria
| | - N Petrov
- Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 9, 1113 Sofia, Bulgaria
| | - J B Parra
- Instituto Nacional del Carbón (INCAR), CSIC, Oviedo 33080, Spain
| | - C O Ania
- Instituto Nacional del Carbón (INCAR), CSIC, Oviedo 33080, Spain.
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78
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Keane D, Basha S, Nolan K, Morrissey A, Oelgemöller M, Tobin JM. Photodegradation of Famotidine by Integrated Photocatalytic Adsorbent (IPCA) and Kinetic Study. Catal Letters 2010. [DOI: 10.1007/s10562-010-0485-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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79
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Velasco LF, Parra JB, Ania CO. Phenol Adsorption and Photo-Oxidation on Porous Carbon/Titania Composites. ADSORPT SCI TECHNOL 2010. [DOI: 10.1260/0263-6174.28.8-9.727] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
| | | | - Conchi O. Ania
- Instituto Nacional del Carbón, (INCAR-CSIC), C/Francisco Pintado Fe, 26, 33011 Oviedo, Spain
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80
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Wang C, Ao Y, Wang P, Hou J, Qian J, Zhang S. Preparation, characterization, photocatalytic properties of titania hollow sphere doped with cerium. JOURNAL OF HAZARDOUS MATERIALS 2010; 178:517-21. [PMID: 20149535 DOI: 10.1016/j.jhazmat.2010.01.111] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Revised: 01/20/2010] [Accepted: 01/21/2010] [Indexed: 05/23/2023]
Abstract
Ce-doped titania hollow spheres were prepared using carbon spheres as template and Ce-doped titania nanoparticles as building blocks. The Ce-doped titania nanoparticles were synthesized at low temperature. The prepared hollow spheres were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectrum (DRS). The effect of Ce content on the physical structure and photocatalytic properties of doped titania hollow sphere samples was investigated. Results showed that there was an optimal Ce-doped content (4%) for the photocatalytic activity of X-3B degradation. The apparent rate constant of the best one was almost 31 times as that of P25 titania. The mechanism of photocatalytic degradation of dyes under visible light irradiation was also discussed.
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Affiliation(s)
- Chao Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environmental Science and Engineering, Hohai University, Nanjing, 210098, China
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81
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Abstract
Composite photocatalysts, made of titanium dioxide and high surface area adsorbents become more and more common. To large extent, this is due to the phenomenon of "Adsorb & Shuttle", i.e. the adsorption of molecules on the inert, adsorptive, domains, followed by diffusion to the photocatalytic domains. This manuscript reviews the published literature on composite photocatalysts, and analyzes the various aspects affecting their performance. One of these aspects is the enhancement of the degradation rate of pollutants, which is governed by a variety of factors including surface area, adsorpticity, strength of interaction, the loading of photocatalyst in the composite, and operation parameters (such as temperature, humidity and pH). Other aspects include a reduction in the emission of intermediate products and a different distribution of end-products. Care was taken to describe the possibility of using the inert adsorptive domains to enhance the degradation of specific species, as well as to discuss the effect of composite photocatalysts on deactivation phenomena, and the interrelation between "Adsorb & Shuttle" phenomena and out- diffusion of oxidizing species from the TiO2 domains, known as the "remote degradation" phenomenon.
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82
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Wang C, Ao Y, Wang P, Hou J, Qian J. A facile method for the preparation of titania-coated magnetic porous silica and its photocatalytic activity under UV or visible light. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.02.030] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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83
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Cravotto G, Binello A, Di Carlo S, Orio L, Wu ZL, Ondruschka B. Oxidative degradation of chlorophenol derivatives promoted by microwaves or power ultrasound: a mechanism investigation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2010; 17:674-687. [PMID: 19816729 DOI: 10.1007/s11356-009-0253-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2009] [Accepted: 09/24/2009] [Indexed: 05/28/2023]
Abstract
BACKGROUND, AIM, AND SCOPE Phenols are the most common pollutants in industrial wastewaters (particularly from oil refineries, resin manufacture, and coal processing). In the last two decades, it has become common knowledge that they can be effectively destroyed by nonconventional techniques such as power ultrasound (US) and/or microwave (MW) irradiation. Both techniques may strongly promote advanced oxidation processes (AOPs). The present study aimed to shed light on the effect and mechanism of US- and MW-promoted oxidative degradation of chlorophenols; 2,4-dichlorophenoxyacetic acid (2,4-D), a pesticide widespread in the environment, was chosen as the model compound. MATERIALS AND METHODS 2,4-D degradation by AOPs was carried out either under US (20 and 300 kHz) in aqueous solutions (with and without the addition of Fenton reagent) or solvent-free under MW with sodium percarbonate (SPC). All these reactions were monitored by gas chromatography-mass spectrometry (GC-MS) analysis and compared with the classical Fenton reaction in water under magnetic stirring. The same set of treatments was also applied to 2,4-dichlorophenol (2,4-DCP) and phenol, the first two products that occur a step down in the degradation sequence. Fenton and Fenton-like reagents were employed at the lowest active concentration. RESULTS The effects of US and MW irradiation were investigated and compared with those of conventional treatments. Detailed mechanisms of Fenton-type reactions were suggested for 2,4-D, 2,4-DCP, and phenol, underlining the principal degradation products identified. MW-promoted degradation under solvent-free conditions with solid Fenton-like reagents (viz. SPC) is extremely efficient and mainly follows pyrolytic pathways. Power US strongly accelerates the degradation of 2,4-D in water through a rapid generation of highly reactive radicals; it does not lead to the formation of more toxic dimers. DISCUSSION We show that US and MW enhance the oxidative degradation of 2,4-D and that a considerable saving of oxidants and cutting down of reaction times is thereby achieved. The results support the interpretation of previously published data and improve the understanding of the factors of direct degradation along different pathways. CONCLUSIONS Oxidative pathways for 2,4-D, 2,4-DCP, and phenol were proposed by a careful monitoring of the reactions and detection of intermediates by GC-MS. RECOMMENDATIONS AND PERSPECTIVES The understanding of the factors that affect chlorophenols degradation along different pathways may facilitate the optimization of the treatment. Type of energy source (US or MW), power, and frequency to be applied could be designed in function of the operative scenario (amount of pollutant in soil, water, or oils).
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Affiliation(s)
- Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, 10125, Turin, Italy.
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84
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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85
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Preparation of MWCNT/TiO2 Composites by Using MWCNTs and Titanium(IV) Alkoxide Precursors in Benzene and their Photocatalytic Effect and Bactericidal Activity. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.11.2637] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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86
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Zhang L, Lv F, Zhang W, Li R, Zhong H, Zhao Y, Zhang Y, Wang X. Photo degradation of methyl orange by attapulgite-SnO2-TiO2 nanocomposites. JOURNAL OF HAZARDOUS MATERIALS 2009; 171:294-300. [PMID: 19577837 DOI: 10.1016/j.jhazmat.2009.05.140] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2008] [Revised: 05/06/2009] [Accepted: 05/29/2009] [Indexed: 05/28/2023]
Abstract
Photocatalytic removal of methyl orange under ultraviolet radiation has been studied using attapulgite (ATT) composites, which were synthesized by depositing SnO(2)-TiO(2) hybrid oxides on the surface of ATT to form a composite photocatalyst (denoted ATT-SnO(2)-TiO(2)) using an in situ sol-gel technique. Results showed that SnO(2)-TiO(2) nanocomposite particles with average size of about 10nm were loaded successfully on to the surface of ATT fibers and were widely dispersed. Correspondingly, the photocatalytic activity of ATT was improved significantly by loading SnO(2)-TiO(2). The photoactivity of the composite photocatalyst decreased in the sequence ATT-SnO(2)-TiO(2)>ATT-SnO(2)>ATT-TiO(2)>ATT. In order to achieve the best photocatalyst, the molar ratio of SnO(2) and TiO(2) in the ATT-SnO(2)-TiO(2) composites was adjusted to give a series with proportions r=n(Ti)/(n(Ti)+n(Sn))=0.0, 0.25, 0.33, 0.50, 0.67, 0.75, 0.80, 0.82, 0.86, 1.0. Results indicated that the proportion of SnO(2) and TiO(2) had a critical effect on the photocatalytic activity, which increased as the content of TiO(2) increased to r<or=0.82 and decreased when r>0.82. The highest degradation rate of methyl orange was 99% within 30 min obtained by using ATT-SnO(2)-TiO(2) with r=0.82. The repeated use of the composite photocatalyst was also confirmed.
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Affiliation(s)
- Lili Zhang
- Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Normal University, Huai'an 223300, China.
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87
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Wang X, Liu Y, Hu Z, Chen Y, Liu W, Zhao G. Degradation of methyl orange by composite photocatalysts nano-TiO2 immobilized on activated carbons of different porosities. JOURNAL OF HAZARDOUS MATERIALS 2009; 169:1061-1067. [PMID: 19464113 DOI: 10.1016/j.jhazmat.2009.04.058] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 03/20/2009] [Accepted: 04/15/2009] [Indexed: 05/27/2023]
Abstract
Composite photocatalysts TiO(2) immobilized on granular activated carbons with different porosities (TiO(2)/AC) were prepared by a novel approach, dip-hydrothermal method using peroxotitanate as precursor. The TiO(2)/AC composites were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and the nitrogen absorption. Their photocatalytic activity was evaluated by degradation of methyl orange (MO). The results showed that nano-TiO(2) particles of anatase type were well deposited on the activated carbon surface. The porosity of activated carbon had significant influence on the adsorption, the amount of TiO(2) deposited on the external surface of AC and the activity of composite photocatalysts. The composite TiO(2)/AC made from proper mesoporosity AC exhibited higher catalytic activity than the mixture of powdered TiO(2) with AC. Furthermore, the mechanism of synergistic effect of AC adsorption and TiO(2) photocatalysis was discussed.
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Affiliation(s)
- Xiaojing Wang
- Department of Chemistry, Tongji University, Shanghai 200092, China
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88
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Comsup N, Panpranot J, Praserthdam P. Effect of TiO2 Crystallite Size on the Activity of CO Oxidation. Catal Letters 2009. [DOI: 10.1007/s10562-009-0135-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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89
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Adsorption and visible-light-derived photocatalytic kinetics of organic dye on Co-doped titania nanotubes prepared by hydrothermal synthesis. Sep Purif Technol 2009. [DOI: 10.1016/j.seppur.2009.03.041] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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90
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91
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Preparation and photocatalytic activity of TiO2-coated granular activated carbon composites by a molecular adsorption-deposition method. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s11426-008-0115-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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92
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Wu CH, Wu CF, Shr JF, Hsieh CT. Parameter settings on preparation of composite photocatalysts for enhancement of adsorption/photocatalysis hybrid capability. Sep Purif Technol 2008. [DOI: 10.1016/j.seppur.2007.10.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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93
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Guo T, Bai Z, Wu C, Zhu T. Influence of environmental temperature and relative humidity on photocatalytic oxidation of toluene on activated carbon fibers coated TiO2. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s11783-008-0039-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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94
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Park IS, Choi SY, Ha JS. High-performance titanium dioxide photocatalyst on ordered mesoporous carbon support. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.03.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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95
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Follansbee DM, Paccione JD, Martin LL. Globally Optimal Design and Operation of a Continuous Photocatalytic Advanced Oxidation Process Featuring Moving Bed Adsorption and Draft-Tube Transport. Ind Eng Chem Res 2008. [DOI: 10.1021/ie071275r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David M. Follansbee
- Department of Chemical and Biological Engineering and Department of Decision Sciences and Engineering Systems, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, and Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, Albany, New York 12201
| | - John D. Paccione
- Department of Chemical and Biological Engineering and Department of Decision Sciences and Engineering Systems, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, and Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, Albany, New York 12201
| | - Lealon L. Martin
- Department of Chemical and Biological Engineering and Department of Decision Sciences and Engineering Systems, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, and Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, Albany, New York 12201
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96
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Li Y, Ma M, Sun S, Wang X, Yan W, Ouyang Y. Preparation and photocatalytic activity of TiO2–carbon surface composites by supercritical pretreatment and sol–gel process. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2008.01.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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97
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Characterization of AC–ZnO catalyst and its photocatalytic activity on 4-acetylphenol degradation. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2007.04.040] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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98
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Cai C, Zhang J, Pan F, Zhang W, Zhu H, Wang T. Influence of Metal (Au, Ag) Micro-Grid on the Photocatalytic Activity of TiO2 Film. Catal Letters 2008. [DOI: 10.1007/s10562-007-9392-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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99
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Ao Y, Xu J, Fu D, Shen X, Yuan C. Low temperature preparation of anatase TiO2-coated activated carbon. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2007.06.039] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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100
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Li Y, Ma M, Wang X, Wang X. Inactivated properties of activated carbon-supported TiO2 nanoparticles for bacteria and kinetic study. J Environ Sci (China) 2008; 20:1527-33. [PMID: 19209644 DOI: 10.1016/s1001-0742(08)62561-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The activated carbon-supported TiO2 nanoparticles (TiO2/AC) were prepared by a properly controlled sol-gel method. The effects of activated carbons (AC) support on inactivated properties of TiO2 nanoparticles were evaluated by photocatalytic inactivation experiments of Escherichia coli. The key factors affecting the inactivation efficiency were investigated, including electric power of lamp, temperature, and pH values. The results show that the TiO2/AC composites have high inactivation properties of E. coli in comparison with pure TiO2 powder. The kinetics of photocatalytic inactivation of E. coli was found to follow a pseudo-first order rate law for TiO2/AC composites, and kinetic behavior could be described in terms of a modified Langmuir-Hinshelwood model. The values of the adsorption equilibrium constants for the bacteria, K(c), and for the rate constants, k(r), were certainly depended on TiO2 content. At 47 wt.% TiO2 coatings with the highest rate constant, the K(c) and k(r) were 1.17 x 10(-8) L/cfu and 1.43 x 10(6) cfu/(L x min), respectively. The variety of parameters shows significant effects on inactivation rate. The outer layer of bacteria decomposed first resulting in inactivation of cell, and with further illumination, the cells nearly decomposed.
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Affiliation(s)
- Youji Li
- College of Chemistry and Chemical Engineering, Jishou University, Hunan 416000, China.
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