Cytarabine degradation by simulated solar assisted photocatalysis using TiO 2

Koltsakidou, Αnastasia; Αντωνοπούλου, Μαρία; Εvgenidou, Εleni; Konstantinou, Ioannis; Lambropoulou, Dimitra A.

doi:10.1016/j.cej.2017.01.132

Cited by 36 publications

(27 citation statements)

References 40 publications

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“…Usually, the degradation of organic pollutants catalysed by a semiconductor is an oxidative process using either directly the oxidising power of photogenerated holes or indirectly through oxidation by reactive oxygen species (ROS). These ROS are formed by reaction of oxygen and/or water with photogenerated e -/h + pair (Azenha et al 2013, Koltsakidou et al 2017. The photooxidation through h + is not kinetically favored in the presence of ROS since these strong oxidising species react much faster.…”

Section: Generalities and Principlesmentioning

confidence: 99%

“…In order to state the photocatalytic efficiency and to confirm the ability of full mineralisation, the final state of the photocatalytic system should be analysed to search for degradation products (if any). For this, a commonly used method is the total organic carbon (TOC) analysis from which the amount of totally oxidised carbon (CO 2 ) at a time t in the photocatalytic system is calculated (Hu et al 2007;Koltsakidou et al 2017;Lin et al 2012;Lopes et al 2016;Luo et al 2016;Mohapatra and Parida 2014;Lu et al 2014). Such analysis does not give information on the identity of the different organic molecules present in the system at time t. Therefore, the remaining degradation products should be identified using other methods such as gas and liquid chromatography (GC and LC), mass spectrometry (MS), nuclear magnetic resonance (NMR), and other analytical methods (Hu et al 2011;Kanigaridou et al 2016;Koltsakidou et al 2017;Lelario et al 2016;Liu et al 2018;Lopes et al 2016;Lu et al 2014;Sun et al 2015;Zhang et al 2015;Zhang et al 2018).…”

Section: Identification Of By-productsmentioning

confidence: 99%

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Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Monfort

Plesch

2018

Environ Sci Pollut Res

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The number of publications on photocatalytic bismuth vanadate-based materials is constantly increasing. Indeed, bismuth vanadate is gaining stronger interest in the photochemical community since it is a solar-driven photocatalyst. However, the efficiency of BiVO-based photocatalyst under sunlight is questionable: in most of the studies investigating the photodegradation of organic pollutants, only few works identify the by-products and evaluate the real efficiency of BiVO-based materials. This short review aims to (i) present briefly the principles of photocatalysis and define the photocatalytic efficiency and (ii) discuss the formation of reactive species involved in the photocatalytic degradation process of pollutants and thus the corresponding photodegradation mechanism could be determined. All these points are developed in a comprehensive discussion by focusing especially on pure, doped, and composite BiVO. Therefore, this review exhibits a critical overview on different BiVO-based photocatalytic systems with their real efficiency. This is a necessary knowledge for potential implementation of BiVO materials in environmental applications at larger scale than laboratory conditions.

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Section: Generalities and Principlesmentioning

confidence: 99%

Section: Identification Of By-productsmentioning

confidence: 99%

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Monfort

Plesch

2018

Environ Sci Pollut Res

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“…4. Literature studies show that the degradation efficiency of some other organic compounds by solar TiO2 photocatalysis was rather high [32][33][34]. The reaction rate constants for the SSLA-TiO2 photocatalysis of some other pesticides, such as λ-cyhalothrin, chlorpyrifos, and diazinon (C0 = 0.1, 0.57, and 0.36 mM, respectively) were 0.48, 0.44, and 0.25 h −1 , respectively [25].…”

Section: Characteristics Of Synthesized Tio2 Filmsmentioning

confidence: 99%

“…Saien et al [45] reported the effects of the initial concentration of S2O8 2− and H2O2 using the UV/TiO2 photocatalysis of Triton X-100, showing an enhancing effect as a result of increasing the initial concentrations of the oxidants. Koltsakidou et al [32] reported a decreasing effect as a result of increasing the initial concentrations of H2O2 on the SSLA-TiO2 photocatalytic degradation of cytarabine, attributed to the fast scavenging of • OH at comparatively higher H2O2 concentrations (i.e., 1-4 mM).…”

Section: Characteristics Of Synthesized Tio2 Filmsmentioning

confidence: 99%

Exhaustive Photocatalytic Lindane Degradation by Combined Simulated Solar Light-Activated Nanocrystalline TiO2 and Inorganic Oxidants

et al. 2019

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Organochlorine compounds (OCs) are very toxic, highly persistent, and ubiquitous contaminants in the environment. Degradation of lindane, a selected OC, by simulated solar light-activated TiO2 (SSLA-TiO2) photocatalysis was investigated. The film types of the TiO2 photocatalyst were prepared using a dip-coating method. The physical properties of the films were investigated using X-ray diffraction, transmission electron microscopy, and environmental scanning electron microscopy. The SSLA-TiO2 photocatalysis led to a lindane removal of 23% in 6 h, with 0.042 h−1 of an observed pseudo first-order rate constant (kobs). The SSLA-TiO2 photocatalysis efficiency was greatly enhanced by adding hydrogen peroxide (H2O2), persulfate (S2O82−), or both combined, corresponding to a 64%, 89%, and 99% lindane removal in the presence of 200 µM of H2O2, S2O82−, or equimolar H2O2-S2O82−, respectively. The hydroxyl and sulfate radicals mainly participated in lindane degradation, proven by the results of a radical scavenger study. The degradation kinetics were hindered in the presence of the water constituents, indicated by a 61%, 35%, 50%, 70%, 88%, and 91% degradation of lindane in 6 h, using a SSLA-TiO2/S2O82−/H2O2 photocatalysis system containing 1.0 mg L−1 humic acid (HA), or 1 mM of CO32−, HCO3−, NO3−, SO42−, and Cl−, respectively. The TiO2 film demonstrated high reusability during four runs of lindane decomposition experiments. The SSLA-TiO2/S2O82−/H2O2 photocatalysis is very effective for the elimination of a persistent OC, lindane, from a water environment.

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“…Compared conventional TiO 2 materials, the CuO synthesized has less photocatalytic efficiency Koltsakidou et al 2017. evaluated the degradation of antineoplastic drug cytarabine by TiO 2 photocatalysis under simulated solar light radiation, and also evaluated the effect of oxidant addition into the semiconductor suspension, conducting experiments in the presence of H 2 O 2 and peroxydisulfate (S authors obtained high percentages of minerali ation after 360 min of experiments ( OC removal 80%) by all treatments examined.…”

mentioning

confidence: 99%

H2O2-assisted photoelectrocatalytic degradation of Mitoxantrone using CuO nanostructured films: Identification of by-products and toxicity

Rosa

Cavalcante

Silva

et al. 2019

Science of The Total Environment

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CuO nanostructured thin films supported on silicon with 6.5 cm 2 area (geometric area greater than the studies reported in the literature) were synthesized by a chemical bath deposition technique. The electrodes were characterized by MEV, XRD, XPS, contact angle, cyclic voltammetry and electrochemical impedance spectroscopy analyses. To evaluate the photoelectrochemical properties of the CuO films, photocurrent-voltage measurements were performed using linear voltammetry. The catalytic activities of CuO nanostructures were evaluated by monitoring photodegradation of Mitoxantrone (MTX) under UV-A light irradiation. The method of photoelectrocatalysis (PEC), applying a voltage of 1.5 V and assisted by adding H 2 O 2 , was undertaken. To the best of our knowledge, no studies on the degradation of anticancer agents using PEC process have been found in the literature. For comparison purposes, experiments were performed under the same conditions by assisted photocatalysis (PC) with H 2 O 2 and direct photolysis. CuO deposits consists of a needle-like morphology. The presence of CuO in the tenorite phase was evidenced by XRD and the XPS spectra showed the presence of copper(II) oxide. The increase in current under illumination shows that CuO exhibits photoactivity. The PEC system showed a 75% level of MTX degradation, while the level achieved using PC was 50%. Under UV-A light alone only 3% removal was obtained after 180 min. Up to 10 by-products were identified by chromatography-mass spectrometry (LC-MS) with m/z values ranging between 521 and 285 and a plausible degradation route has been proposed. It is worth mentioning that 9 by-products identified in this work, were not found in the literature in other studies of degradation or products generated as metabolites. The toxicity tests of MTX before and after PEC treatment with

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Cytarabine degradation by simulated solar assisted photocatalysis using TiO 2

Cited by 36 publications

References 40 publications

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Exhaustive Photocatalytic Lindane Degradation by Combined Simulated Solar Light-Activated Nanocrystalline TiO2 and Inorganic Oxidants

H2O2-assisted photoelectrocatalytic degradation of Mitoxantrone using CuO nanostructured films: Identification of by-products and toxicity

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