Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

Xue, Wei; Zhang, Guowen; Xu, Xiong-Fa; Yang, Xiaoguang; Liu, Chaojun; Xu, Yuehua

doi:10.1016/j.cej.2011.01.007

Cited by 108 publications

(37 citation statements)

References 36 publications

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“…That might be the reason why the optimal dosage of ceria was 9 at% under UV illumination. Our results are consistent with the results of earlier studies of photoluminescence and photocatalytic in Ce-doped TiO 2 samples [39,41,42], which suggested that the lower photoluminescence might indicate fewer electron-hole recombination and lead to the increase in photocatalytic activity.…”

Section: Resultssupporting

confidence: 82%

Characteristics and Photocatalytics Activities of Ce-Doped ZnO Nanoparticles

Djaja¹,

Saleh²

2013

MSA

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Ce-doped ZnO nanoparticles with various doping concentrations of cerium ion were prepared by the co-precipitation method. All prepared nanoparticles were characterized by electron spin resonance (ESR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectroscopy. All nanoparticles show X-ray diffraction pattern that matched with ZnO in its wurzite structure and average grain size was in the range of 13 -16 nm. UV-Vis measurements indicated a red shift of the photophysical response of ZnO after doping that was exhibited in reflection spectra in the visible region between 300 -800 nm. In addition, it has been found from electron spin resonance measurements that defects, which are likely to be oxygen vacancy and an electron trapped at cerium site are formed in our Ce-doped ZnO particles. Photocatalytic activities of Ce-doped ZnO were evaluated by irradiating the nanoparticles solution to ultraviolet light by taking methyl orange as organic dye. The experiment demonstrated that the photodegradation increased as doping concentrations increased at first and then decreased when the doping concentration exceeded 9 at%. It is proposed that the photocatalytic activity is strongly dependent on the formation of oxygen vacancy and an electron trapped at cerium site.

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Section: Resultssupporting

confidence: 82%

Characteristics and Photocatalytics Activities of Ce-Doped ZnO Nanoparticles

Djaja¹,

Saleh²

2013

MSA

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“…By the third method, metal decoration, two mechanisms can be involved to enhance the photocatalytic activity of TiO 2 : (I) replacement of  4 Ti in TiO 2 lattice by metals which results in a narrow band gap or (II) the use of noble metals to facilitate the electron transfer from TiO 2 to noble metals [15]. In comparison to the studies involving noble metals, transition metal ions and non-metal doped TiO 2 photocatalysts, there is a limited amount of reports about the use of rare-earth metals as dopants, such as, Cerium [16,17]. The improved photocatalytic activity of (rare-earth metals)-TiO 2 has been related to a decrease of the electron-hole recombination rate through electron capture by the incompletely occupied 4f and empty 5d orbitals of rare-earth metals.…”

Section: Co and O Hmentioning

confidence: 99%

“…3a depicts the diffusive reflectance spectra and optical band gap determination of the CeTiO 2 /diatomite composites. It is well-known that pure TiO 2 shows absorption only in the UV-light region (λ≤387 nm) [26], which is associated to the excitation of electrons from O 2p to Ti 3d electronic orbital [16]. Fig.3a shows that, in comparison to the spectrum of un-doped TiO 2 /diatomite composites, Ce-doped TiO 2 /diatomite presented better absorption intensity in UV-light region and an absorption tail in the region from 400 to 700 nm.…”

Section: Xrd Analysismentioning

confidence: 99%

Enhanced photocatalytic properties of reusable TiO 2 -loaded natural porous minerals in dye wastewater purification

et al. 2016

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Diatomite-based recyclable photocatalysts containing single lanthanide doped TiO 2 nanoparticles (NPs) were synthesized by using simple sol-gel method. Photocatalytic activities of the prepared Ce-or La-single doped TiO 2 /diatomite catalysts were estimated by the degradation of Rhodamine B (RhB) under simulated sunlight irradiation. The XRD and Raman spectra shown only anatase phase of TiO 2 for the un-doped and Ce-doped samples. The TEM images revealed uniform distribution of TiO 2 NPs on the matrix, indicating that diatomite played an important role to prevent the agglomeration of TiO 2 NPs. Ce-TiO 2 /diatomite showed a red shift in UV-visible light absorption edge with enhanced absorption intensity than un-doped sample, whereas La-TiO 2 /diatomite showed a blue shift. The bandgap energy of 1.5%-Ce doped sample is as low as 2.75 eV. The XPS spectra showed the presence of both Ce 3+ and Ce 4+ oxidation states for Ce dopant. The photoluminescence spectra of the Ce-doped samples showed first decrease in the recombination centers with the maximum decrease for 1.5%-Ce doped sample and then started increase with the increasing Ce in the samples. As compared to the La-doped samples, a desired behavior was observed for the Ce-doped hybrid due to the redox Ce 4+ /Ce 3+ pairs acting as electron scavengers and localized unoccupied Ce 4f level narrowing the band gap. The incorporation with diatomite as support of TiO 2 nanoparticles is contributed for the improved reusability and also gives a promising strategy to enable the application of nano-photocatalysts in a real wastewater remediation treatment.

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“…Fe, Cu, other transition metal, rare earth ions, and nonmetal ions such as S and/or N) (Ohno, 2005;Sathish et al, 2005;Zhou et al, 2005;Xiao et al, 2007;Xiaoyuan et al, 2008;Xue et al, 2011) by mixing and calcinations. In these reports, photoactivity were reduced by transition metal ion doping and non-metal doping titania had a disadvantage that it cannot be used repeatedly in the water.…”

Section: Introductionmentioning

confidence: 99%

“…After this report, a lot of researchers have been reporting for their structures, physical properties, crystal growth mechanism, photoactivity and etc. (Hu et al, 2011;Xue et al, 2011 For the decomposition organic substrates in the reaction container, we developed Ce-doped titanate nanotubes as visible light responsive photo catalyst. Anatase titania and titanate nanotubes were prepared using the sol-gel method and hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%