Photocatalytic decomposition of cortisone acetate in aqueous solution

Romão, Joana; Hamdy, Mohamed S.; Mul, Guido; Baltrušaitis, Jonas

doi:10.1016/j.jhazmat.2014.05.087

Cited by 29 publications

(20 citation statements)

References 50 publications

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“…Contrary to often reported in the literature [20], adsorption of the substrate apparently does not play an essential role in the degradation mechanism. This observation is supported by other works that report the degradation of organic compounds by TiO 2 without the occurrence of adsorption [23]. 4-CP is known for being poorly adsorbed on TiO 2 surfaces, which is explained by the displacement of 4-CP adsorption equilibrium by water molecules in virtue of their greater affinity for theTiO 2 adsorption sites [24].…”

Section: Tablesupporting

confidence: 85%

Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water

Jorgetto

Milbrat²,

Schneider

et al. 2018

Applied Surface Science

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This work addresses the development of a magnetically extractable magnetite-silica-titania photocatalyst to be applied in the degradation of organic compounds in water. MCM-41 silica was successfully deposited on magnetite, providing large surface area for anchoring of TiO x species, and preventing thermally induced conversion of magnetite to hematite. A good correlation between the calculated values and amount of titania deposited on the silica-covered magnetite particles was obtained for a synthesis route involving the treatment of magnetitesilica in boiling ethanolic Ti-precursor solution. Photocatalytic activity in conversion of 4-chlorophenol could only be observed for compositions containing larger than ∼50 wt% titania, whereas increasing the titania content did not significantly improve performance. Experiments carried out at pH ∼ 3.0 and ∼7.2 demonstrated the performance is relatively pH-independent. The structure activity-correlation of the materials is briefly discussed.

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Section: Tablesupporting

confidence: 85%

Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water

Jorgetto

Milbrat²,

Schneider

et al. 2018

Applied Surface Science

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“…The catalyst H600 [25(± 1) mg], the required amount of salt and 50 mL stock solution were mixed in a quartz glass beaker, covered with a quartz glass lid and stirred (350 rpm) in the dark for 30 min before the first sample was taken (0 h measurement). UV-irradiation of the suspension was achieved using a custom-made closed box reactor 64 equipped with eight Philips UV lamps (TL-D 18W BLB, λ max ≈ 375 nm, intensity ≈ 0.32 mW·cm –2 ). Any influence of UV light absorption by the salt solutions on the PCD rate was excluded (Figure S2).…”

Section: Methodsmentioning

confidence: 99%

Comparative Analysis of Photocatalytic and Electrochemical Degradation of 4-Ethylphenol in Saline Conditions

Brüninghoff

Duijne

Braakhuis

et al. 2019

Environ. Sci. Technol.

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We evaluated electrochemical degradation (ECD) and photocatalytic degradation (PCD) technologies for saline water purification, with a focus on rate comparison and formation and degradation of chlorinated aromatic intermediates using the same non-chlorinated parent compound, 4-ethylphenol (4EP). At 15 mA·cm –2 , and in the absence of chloride (0.6 mol·L –1 NaNO 3 was used as supporting electrolyte), ECD resulted in an apparent zero-order rate of 30 μmol L –1 ·h –1 , whereas rates of ∼300 μmol L –1 ·h –1 and ∼3750 μmol L –1 ·h –1 were computed for low (0.03 mol·L –1 ) and high (0.6 mol·L –1 ) NaCl concentration, respectively. For PCD, initial rates of ∼330 μmol L –1 ·h –1 and 205 μmol L –1 ·h –1 were found for low and high NaCl concentrations, at a photocatalyst (TiO 2 ) concentration of 0.5 g·L –1 , and illumination at λ max ≈ 375 nm, with an intensity ∼0.32 mW·cm –2 . In the chlorine mediated ECD approach, significant quantities of free chlorine (hypochlorite, Cl 2 ) and chlorinated hydrocarbons were formed in solution, while photocatalytic degradation did not show the formation of free chlorine, nor chlorine-containing intermediates, and resulted in better removal of non-purgeable hydrocarbons than ECD. The origin of the minimal formation of free chlorine and chlorinated compounds in photocatalytic degradation is discussed based on photoelectrochemical results and existing literature, and explained by a chloride-mediated surface-charge recombination mechanism.

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“…This container was covered by a quartz plate to prevent evaporation of the solution. Then, it was placed inside a black box reactor as described by Romão et al Aluminum foil was used to cover the sides of the beaker glass to make sure that the solution was only top‐illuminated. First, the suspension was stirred at 450 rpm to obtain adsorption/desorption equilibrium.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Methanol on the Photodeposition of Pt Nanoparticles on Tungsten Oxide

Wenderich

Han

Mul

2017

Part & Part Syst Charact

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Formation of platinum nanoparticles on tungsten oxide by photodeposition from acidic [PtCl6]2− solutions in the absence or presence of methanol is studied in detail. Without methanol, [PtCl6]2−‐ions adsorbed on the WO3 surface are converted to highly dispersed PtO/Pt(OH)2 particles upon illumination, the maximum achievable amount being limited to 10–30% of [PtCl6]2− present in solution. Inclusion of methanol not only promotes adsorption of [PtCl6]2− ions, but upon illumination results in a deposited Pt quantity close to 100% of [PtCl6]2−. The obtained Pt particles are in the metallic state, large, and often clustered. The limited loading and presence of PtO/Pt(OH)2 in the absence of methanol is explained by reduction of WO3‐surface sites, accompanied by water oxidation catalyzed by PtO/Pt(OH)2 deposits. The extensive reduction of Pt in methanol solutions is likely induced by methoxy‐radicals, oxidatively formed by reaction of methanol with photogenerated holes. This study provides guidelines for optimization of synthesis procedures of Pt/WO3 (photo)catalysts.

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Photocatalytic decomposition of cortisone acetate in aqueous solution

Cited by 29 publications

References 50 publications

Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water

Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water

Comparative Analysis of Photocatalytic and Electrochemical Degradation of 4-Ethylphenol in Saline Conditions

The Effect of Methanol on the Photodeposition of Pt Nanoparticles on Tungsten Oxide

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