Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

Šojić, Daniela V.; Despotović, Vesna; Abramović, Biljana F.; Todorova, N.; Giannakopoulou, T.; Trapalis, C.

doi:10.3390/molecules15052994

Cited by 53 publications

(20 citation statements)

References 26 publications

(29 reference statements)

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“…As well known, semiconductors excited by light (hv C Eg) can generate electrons and holes. In an aqueous solution, the electrons can be trapped by oxygen to produce superoxide radicals [3], and the holes at the semiconductors' surface are scavenged by surface hydroxyl groups and water molecules to generate ÁOH radicals [4]. These active species (ÁOH, h ?…”

Section: Introductionmentioning

confidence: 99%

Photoinduced charge separation and simulated solar-driven photocatalytic performance of C–N-co-doped TiO2 prepared by sol–gel method

Chen

Zhong

et al. 2015

J Sol-Gel Sci Technol

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C-N-co-doped anatase TiO 2 photocatalysts were successfully prepared by a sol-gel method and characterized by Brunauer-Emmett-Teller method, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope (SEM), and surface photovoltage spectroscopy (SPS). The separation efficiency of photogenerated charges was investigated using benzoquinone as scavenger. An obvious redshift of the absorption edge of TiO 2 was observed owing to C and N doping. Moreover, doping C and N into TiO 2 increases the content of hydroxyl content on the surface of photocatalysts and photoinduced charge separation efficiency. The photocatalytic activity was evaluated by decolorization of methyl orange (MO) aqueous solution under simulated sun light and visible light irradiation. The results show that photocatalytic activities of the TiO 2 are greatly improved by C and N co-doping, which can be further confirmed by the removal of COD of MO aqueous solution. Graphical Abstract In general, the strong SPS response corresponds to the high separation rate of photoinduced charge carriers on the basis of the SPS principle. Thus, it can be confirmed that the C-, N-TiO 2 sample has a higher charge separation rate than the pure TiO 2 sample, and the 4 % C-, N-TiO 2 shows the highest charge separation rate 400 420 440 460 480 500 0.00 0.02 0.04 0.06 Photovoltage (mV) Wavelength (nm) 5%C-,N-TiO 2 0%C-,N-TiO 2 4%C-,N-TiO 2 300 350 400 450 500 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

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Section: Introductionmentioning

confidence: 99%

Photoinduced charge separation and simulated solar-driven photocatalytic performance of C–N-co-doped TiO2 prepared by sol–gel method

Chen

Zhong

et al. 2015

J Sol-Gel Sci Technol

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“…A mixture of picloram, clopyralid and triclopyr has been used to test the activity and stability of the catalyst. These herbicides have been eliminated from aqueous media by several technologies such as Fenton, electro‐Fenton, photo‐Fenton, O 3 /H 2 O 2 , photocatalysis, UV and H 2 O 2 /UV, etc. However, to the best of the author's knowledge, the efficiency of photocatalytic ozonation has not been investigated for the removal of pyridine‐based herbicides.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic ozonation of pyridine‐based herbicides by N‐doped titania

Solís

Rivas

Gimeno

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND A mixture of three pyridine herbicides in water (clopyralid, triclopyr and picloram) has been treated with photocatalytic processes, involving oxygen or ozone. Nitrogen doped and undoped titania were used in the process. Toxicity evolution during photocatalytic ozonation was monitored considering BOD, Daphnia parvula and fitotoxicity trials. RESULTS N doped titania with an optimized photoactivity was tested in photocatalytic ozonation, leading to nearly 95% mineralization in 180 min. This catalyst was characterized by SEM, TEM, XRD and XPS techniques (13.5 nm crystal size, anatase phase, 1% N, and formation of O‐Ti‐N linkage). No loss of photocatalytic activity was observed after five consecutive runs. Although no toxicity from the parent compounds was observed, this parameter increased during the early stages of the oxidation process. When parent compounds were totally degraded and dechlorination was completed, toxicity decayed again to negligible values. CONCLUSION N doping improves bare titania photoactivity through an optimum amount of N. Photocatalysis/ozone showed better behavior than photocatalysis/oxygen in herbicide removal and mineralization, and no significant loss of activity was observed after five runs. Toxicity initially increased due to toxic byproducts formation; however, it decreased after their abatement. © 2015 Society of Chemical Industry

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“…[1][2][3][4][5][6][7][8][9][10][11][12] In particular, the photocatalytic selective oxidation technique demonstrates promising potential for organic synthesis on account of its facile implementation under mild conditions and the possibility to decrease the undesired environmental pollution. dyes and volatile organic pollutants), water splitting, and selective oxidation.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the construction of graphene–CdS nanocomposites as efficient visible-light-driven photocatalysts for selective organic transformation

et al. 2014

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The cadmium sulfide (CdS) microsphere decorated graphene (GR) nanocomposite (GR-CdS) was prepared by a facile hydrothermal approach in which CdS ingredients were closely enwrapped by the GR scaffold.The GR-CdS nanocomposite was subjected to a number of characterizations including X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), field emission scanning electron microscopy (FESEM), transmission scanning electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS).It was found that integration of CdS microspheres with two-dimensional GR scaffolds exerts a profound influence on the properties of hybrid nanocomposites, such as optical and electronic nature along with morphology. Photocatalytic performances of the GR-CdS nanocomposites were evaluated by selective organic transformation under mild conditions. The results demonstrate that the GR-CdS nanocomposite can serve as an efficient visible-light-driven photocatalyst for the selective oxidation of benzyl alcohol to benzaldehyde under ambient conditions. The significantly enhanced photocatalytic performance of GR-CdS nanocomposites can be attributed to the synergistic effect of enhanced light absorption intensity and high electron conductivity of GR, which facilitates charge separation and lengthens the lifetime of photogenerated electron-hole pairs. Moreover, photocatalytic performances of various GR-CdS nanocomposites featuring different degrees of interfacial contact between GR and CdS were also systematically explored. It is anticipated that our work could enrich the information on the preparation of narrow bandgap semiconductor/GR hybrid nanocomposites for a wide range of photocatalytic applications.

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Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

Cited by 53 publications

References 26 publications

Photoinduced charge separation and simulated solar-driven photocatalytic performance of C–N-co-doped TiO2 prepared by sol–gel method

Photoinduced charge separation and simulated solar-driven photocatalytic performance of C–N-co-doped TiO2 prepared by sol–gel method

Photocatalytic ozonation of pyridine‐based herbicides by N‐doped titania

Revisiting the construction of graphene–CdS nanocomposites as efficient visible-light-driven photocatalysts for selective organic transformation

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