Synergic photocatalytic effects of nitrogen and niobium co-doping in TiO2 for the redox conversion of aquatic pollutants under visible light

Lim, Jonghun; Murugan, P.; Lakshminarasimhan, N.; Kim, Jae Young; Lee, Jae Sung; Lee, Sang Hyup; Choi, Wonyong

doi:10.1016/j.jcat.2013.05.014

Cited by 74 publications

(52 citation statements)

References 44 publications

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“…34 The concentration of photogenerated H 2 O 2 was determined by a colorimetric DPD method. 35 The absorption change was monitored at 540 nm (3 ¼ 6850 M À1 cm À1 ) 36 for Cr(VI) and at 551 nm (3 ¼ 2 Â 10 4 M À1 cm À1 ) 35 for H 2 O 2 using a UV/Vis spectrophotometer (Agilent 8453).…”

Section: Photochemical Activity Testmentioning

confidence: 99%

Visible light sensitization of TiO₂ nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

2017

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The use of curcumin, an active ingredient of turmeric powder (a dye component in curry), as a TiO 2 photosensitizer was investigated in terms of the photochemical and photoelectrochemical (PEC) properties.Owing to its strong visible light absorption and strong surface complexation, the curcumin-sensitized TiO 2 composite exhibited notable activities for the photochemical degradation of organic compounds, the reduction of chromate (Cr(VI)), and the generation of OH radicals and H 2 O 2 through the reduction of O 2 under visible light (l > 420 nm). Various spectroscopic methods confirmed the anchoring of curcumin on TiO 2 and the photochemical and PEC properties of curcumin/TiO 2 were compared with those of TiO 2 sensitized by a ruthenium complex (RuL 3 ) that has been frequently employed as a visible light sensitizer. Curcumin/TiO 2 exhibited consistently higher photochemical and PEC activities than RuL 3 /TiO 2 over a wide pH range in an aquatic environment. These results confirm the practical viability of using a natural food dye, curcumin, as an efficient, eco-friendly, and cheap photo-sensitizer of TiO 2 for solar environmental applications. However, it should be noted that curcumin on TiO 2 like other dye sensitizers is degraded as a result of the sensitizing reactions in water and should be considered as a sensitizing reagent, not a photocatalyst.

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Section: Photochemical Activity Testmentioning

confidence: 99%

Visible light sensitization of TiO₂ nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

2017

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“…The E fb value can be determined by extrapolating the linear part of the curve to 1 C 2 = 0, and the E fb values of SnIn 4 S 8 and RGO/SnIn 4 S 8 composite are´0.614 and´0.294 V versus the saturated calomel electrode (SCE), respectively. Supposing the difference between flat potential and conduction band can be negligible for n-type semiconductors [41], the E fb value is approximately equal to the E CB value. Compared with pure SnIn 4 S 8 , the E CB value of RGO/SnIn 4 S 8 shifted to the positive direction, which could explain their enhanced photocatalytic activities.…”

Section: Mott-schottky Analysismentioning

confidence: 99%

Fabrication of Hierarchically Porous Reduced Graphene Oxide/SnIn4S8 Composites by a Low-Temperature Co-Precipitation Strategy and Their Excellent Visible-Light Photocatalytic Mineralization Performance

et al. 2016

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Hierarchically porous reduced graphene oxide/SnIn 4 S 8 (RGO/SnIn 4 S 8 ) composites with visible-light response and strong mineralization ability were first successfully prepared by a facile low-temperature co-precipitation method, and were characterized by X ray diffraction (XRD), scanning electron microscope (SEM), Brunauer-Emmet-Teller (BET), UV-Visible spectrophotometer (UV-Vis), Raman spectra and Photoluminescence (PL) techniques. RGO/SnIn 4 S 8 composite exhibits strong absorption in UV and visible-light range. The optimized 5% RGO/SnIn 4 S 8 possesses the optimal photocatalytic degradation efficiency and the best mineralization performance with complete degradation of Rhodamine B (RhB) within 70 min and 73.17% mineralization yield within 160 min under visible-light irradiation, which is much higher than that of pure SnIn 4 S 8 . The main reactive species, which play crucial roles in the degradation and mineralization of RhB, follow the order of h + >¨O 2´>¨O H. The intermediate products of RhB degradation were analyzed by using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS), and the possible degradation pathways and mechanism were proposed. Moreover, 5% RGO/SnIn 4 S 8 exhibits excellent reusability and stability without an obvious decrease in photocatalytic activity after four consecutive photocatalytic degradation-regeneration experiments.

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“…7 After the first literature reported for TiO 2 doping with N in 2001 by Asahi et al, 8 resulting in photocatalytic activity at wavelengths up to 540 nm, the N-doped TiO 2 material was used in visible processes for degradation of phenol, 9 methyl orange, 7 and rhodamine B. 11 Given the current state-of-art, 5,[12][13][14] it is highly desirable to identify new synthesis routes for TiO 2 doping in order to obtain visible light-active photocatalysts. TiO 2 , doped or not, has been synthesized using techniques such as sputtering, 15,16 chemical vapor deposition, 17,18 sol-gel process, 19,20 hydrothermal process, 7 electrochemical methods, 21,22 and, more recently, ionothermal synthesis.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis

2017

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This work concerns the preparation a nitrogen-doped TiO 2 by ionothermal synthesis methods and the photocatalytic studies. In this procedure, alkoxide was used as a titanium source, and a deep eutectic mixture of choline chloride and urea (molar ratio 1:2) served as a solvent and source of nitrogen. Different samples were synthesized varying the percentages of the eutectic mixture, titanium butoxide, and water, as well as temperature and reaction time. The catalysts were characterized by X-ray diffraction, Raman spectrometry, scanning electron microscopy, and diffuse reflectance spectroscopy. N-doping was confirmed by X-ray photoelectron spectroscopy. The photocatalytic activity of the N-TiO 2 nanoparticles was evaluated in the oxidation of N,N-dimethyl-4-nitrosoaniline (RNO) dye. The best photocatalytic activity under illumination by UV and visible light was found for the catalysts prepared under reflux in the presence of water, and for the catalysts prepared hydrothermally using intermediate percentages of the nitrogen source (the eutectic mixture).

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Synergic photocatalytic effects of nitrogen and niobium co-doping in TiO2 for the redox conversion of aquatic pollutants under visible light

Cited by 74 publications

References 44 publications

Visible light sensitization of TiO₂ nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

Visible light sensitization of TiO₂ nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

Fabrication of Hierarchically Porous Reduced Graphene Oxide/SnIn4S8 Composites by a Low-Temperature Co-Precipitation Strategy and Their Excellent Visible-Light Photocatalytic Mineralization Performance

Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis

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Synergic photocatalytic effects of nitrogen and niobium co-doping in TiO2 for the redox conversion of aquatic pollutants under visible light

Cited by 74 publications

References 44 publications

Visible light sensitization of TiO2 nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

Visible light sensitization of TiO2 nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

Fabrication of Hierarchically Porous Reduced Graphene Oxide/SnIn4S8 Composites by a Low-Temperature Co-Precipitation Strategy and Their Excellent Visible-Light Photocatalytic Mineralization Performance

Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis

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Visible light sensitization of TiO₂ nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations

Visible light sensitization of TiO₂ nanoparticles by a dietary pigment, curcumin, for environmental photochemical transformations