Synthesis and characterization of N-doped TiO2 and its enhanced visible-light photocatalytic activity

Cheng, Xiuwen; Yu, Xin; Xing, Zipeng; Yang, Lisha

doi:10.1016/j.arabjc.2012.04.052

Cited by 142 publications

(59 citation statements)

References 20 publications

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“…As ar esult of chargec ompensation, they improvet he visible-light response.T ill now,n os tudy has demonstrated completely the exact chemical states of the Ns peciest hat are responsible for achieving the visiblelight photocatalytic activity of TiO 2 Figure 13 shows ap ossible mechanism for the photocatalytic reaction of the OC À radical and the schematic band structure of N-doped TiO 2 under visible-light irradiation. [233] As reported for metal doping, non-metal-doped TiO 2 has its own problems. The hole (h + )t hen reacts with the HO À group to produce the COH radical, whichi sr esponsible for the degradation of the pollutants under visiblelight irradiation.…”

Section: Nitrogen Dopingmentioning

confidence: 97%

“…For the N-doped TiO 2 sample, the C, O, and Ti elements and as mall amounto ft he N elementa re detected.T he authors also describe ap eak at a binding energy of 401.2 eV corresponding to the TiÀOÀNb ond and other small peaks attributed to anionic Ni nt he form of NÀTiÀOb onds. [233] As reported for metal doping, non-metal-doped TiO 2 has its own problems. For example, the doping of non-metals into the lattice of TiO 2 usually resultsinthe formation of oxygen vacancies in the bulk that can act as massive recombination centers of photoinduced electron-hole pairs and, therefore, limit the visible-light photocatalysis efficiency of doped TiO 2 .T he stabilityo fn on-metal-doped TiO 2 is also ac oncern regarding…”

Section: Nitrogen Dopingmentioning

confidence: 97%

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Recent Progress on Titanium Dioxide Nanomaterials for Photocatalytic Applications

et al. 2018

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Environmental and energy problems have drawn much attention owing to rapid population growth and accelerated economic development. For instance, photocatalysis, "a green technology", plays an important role in solar-energy conversion owing to its potential to solve energy and environmental problems. Recently, many efforts have been devoted to improving visible-light photocatalytic activity by using titanium dioxide as a photocatalyst as a result of its wide range of applications in the energy and environment fields. However, fast charge recombination and an absorption edge in the UV range limit the photocatalytic efficiency of TiO under visible-light irradiation. Many investigations have been undertaken to overcome the limitations of TiO and, therefore, to enhance its photocatalytic activity under visible light. The present literature review focuses on different strategies used to promote the separation efficiency of electron-hole pairs and to shift the absorption edge of TiO to the visible region. Current synthesis techniques used to elaborate several nanostructures of TiO -based materials, recent progress in enhancing visible photocatalytic activity, and different photocatalysis applications will be discussed. On the basis of the studies reported in the literature, we believe that this review will help in the development of new strategies to improve the visible-light photocatalytic performance of TiO -based materials further.

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Section: Nitrogen Dopingmentioning

confidence: 97%

Section: Nitrogen Dopingmentioning

confidence: 97%

Recent Progress on Titanium Dioxide Nanomaterials for Photocatalytic Applications

et al. 2018

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“…Although, some authors agree that at ca 550 °C, rutile starts to crystallize from anatase [69], others observed the precipitation of anatase phase (in N-TiO 2 powders) at ca 400 °C, remaining stable up to 700 °C, after which rutile began to appear [72]. Cheng et al [73] observed a mixed phase composition similar to Degussa P25 (80% anatase and 20% rutile) in N-TiO 2 films heated treated at 350 °C.…”

Section: Resultsmentioning

confidence: 99%

Photonic Band Gap and Bactericide Performance of Amorphous Sol-Gel Titania: An Alternative to Crystalline TiO2

et al. 2018

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In addition to its traditional application in white pigments, nanocrystalline titania (TiO2) has optoelectronic and photocatalytic properties (strongly dependent on crystallinity, particle size, and surface structure) that grant this naturally occurring oxide new technological applications. Sol-gel is one of the most widely used methods to synthesize TiO2 films and NPs, but the products obtained (mostly oxy-hydrated amorphous phases) require severe heat-treatments to promote crystallization, in which control over size and shape is difficult to achieve. In this work, we obtained new photocatalytic materials based on amorphous titania and measured their electronic band gap. Two case studies are reported that show the enormous potential of amorphous titania as bactericide or photocatalyst. In the first, amorphous sol-gel TiO2 thin films doped with N (TiO2−xNx, x = 0.75) were designed to exhibit a photonic band gap in the visible region. The identification of Ti-O-N and N-Ti-O bindings was achieved by XPS. The photonic band gaps were found to be 3.18 eV for a-TiO2 and 2.99 eV for N-doped a-TiO2. In the second study, amorphous titania and amine-functionalized amorphous titania nanoparticles were synthetized using a novel base-catalysed sol-gel methodology. All the synthesized amorphous TiO2 nanoparticles exhibit bactericide performance (E. coli, ASTME 2149-13).

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“…It has been reported that the particle size of TiO 2 NPs developed through Ti-based flocculation primarily depends on the quality of the feed water that has been used [6,45,46]. Moreover, the substitutional and interstitial doping of impurities from the feed water can significantly affect the particle size of the prepared TiO 2 NPs [24,47]. For instance, the high Ca (large atomic radius when comparing Ti) content (see Table 2) in A-TiO 2 crystal might have contributed towards the enhancement of crystal size through substitutional doping [32].…”

Section: Physicochemical Properties Of the Prepared A-tio2mentioning

confidence: 99%

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

et al. 2020

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The purpose of the study was to effectively treat algae bloomed water while using a Ti-based coagulant (TiCl4) and recover photoactive novel anatase TiO2 from the flocculated sludge. Conventional jar tests were conducted in order to evaluate the coagulation efficiency, and TiCl4 was found superior compared to commercially available poly aluminum chloride (PAC). At a dose of 0.3 g Ti/L, the removal rate of turbidity, chemical oxygen demand (COD), and total phosphorus (TP) were measured as 99.8%, 66.7%, and 96.9%, respectively. Besides, TiO2 nanoparticles (NPs) were recovered from the flocculated sludge and scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and X-ray diffraction (XRD) analysis confirmed the presence of only anatase phase. The recovered TiO2 was found to be effective in removing gaseous CH3CHO and NOx under UV-A lamp at a light intensity of 10 W/m2. Additionally, the TiO2 mixed mortar blocks that were prepared in this study successfully removed atmospheric nitrogen oxide (NOx) under UV irradiance. This study is one of the first to prepare anatase TiO2 from flocculated algal sludge and it showed promising results. Further research on this novel TiO2 concerning internal chemical bonds and shift in the absorbance spectrum could explore several practical implications.

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Synthesis and characterization of N-doped TiO2 and its enhanced visible-light photocatalytic activity

Cited by 142 publications

References 20 publications

Recent Progress on Titanium Dioxide Nanomaterials for Photocatalytic Applications

Recent Progress on Titanium Dioxide Nanomaterials for Photocatalytic Applications

Photonic Band Gap and Bactericide Performance of Amorphous Sol-Gel Titania: An Alternative to Crystalline TiO2

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

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