Kinetic study of salicylic acid photocatalytic degradation using sol–gel anatase thin film with enhanced long-term activity

Plavac, Bojan; Grčić, Ivana; Brnardić, Ivan; Grozdanić, Vedrana; Papić, Sanja

doi:10.1007/s11144-016-1090-x

Cited by 10 publications

(2 citation statements)

References 40 publications

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“…This reduction can be partly attributed to the accumulation of intermediaries formed by the degradation of the SA. The main reaction products of SA degradation by hydroxyl radicals have already been described in the literature as 2,3-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, and catechol [63][64][65][66][67]. These compounds compete with SA for hydroxyl radicals, reducing the SA photocatalytic degradation rate.…”

Section: Reusability Testsmentioning

confidence: 99%

N-Doped TiO2-Nb2O5 Sol–Gel Catalysts: Synthesis, Characterization, Adsorption Capacity, Photocatalytic and Antioxidant Activity

Fuziki,

Ribas,

Abreu

et al. 2023

Catalysts

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TiO2-based semiconductors are formidable photocatalysts for redox reaction applications. Although N-doped TiO2-Nb2O5 catalysts have already been explored in the literature, studies on their antioxidant activity are scarce, and systematic investigations on the effects of synthesis parameters over a wide range of %Nb and NH4OH concentrations are limited. In addition, the relationship between optimal pH and %Nb has not yet been adequately explored. In the present work, the sol–gel synthesis of N-doped TiO2-Nb2O5 catalysts was optimized using a design of experiments approach focused on photocatalysis, adsorption, and antioxidant applications. The samples were characterized by TGA, SEM/EDS, XRD, PZC tests, photoacoustic spectroscopy, and N2-adsorption/desorption experiments. The salicylic acid (SA) degradation tests and DPPH radical scavenging assays demonstrated the superior photocatalytic activity (up to 72.9% SA degradation in 30 min, pH 5) and antioxidant capacity (IC50 = 88.9 μg mL−1) of pure TiO2 compared to the N-doped TiO2-Nb2O5 catalysts. The photocatalytic activity, however, proved to be intensely dependent on the pH and %Nb interaction, and at pH 3, the 25Nb-1N-400 catalyst promoted more significant SA degradation (59.9%) compared to pure TiO2 (42.8%). In the methylene blue (MB) adsorption tests, the catalysts N-doped TiO2-Nb2O5 showed removals at least seven times greater than TiO2 catalysts without Nb.

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Section: Reusability Testsmentioning

confidence: 99%

N-Doped TiO2-Nb2O5 Sol–Gel Catalysts: Synthesis, Characterization, Adsorption Capacity, Photocatalytic and Antioxidant Activity

Fuziki,

Ribas,

Abreu

et al. 2023

Catalysts

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show abstract

“…The rate of photon absorption in systems using immobilized photocatalyst depends on the incident photon flux on the photocatalyst surface [32,33] which can be estimated from the LSSE model: (6) where Iw is the radiation intensity measured at the lamp wall, RL and L are lamp radius and length, respectively, x is a geometrical design parameter of an annular photoreactor which for a perfectly centered lamp is [x = (H -L) / 2] (Fig. 2) and z is the axial coordinate.…”

Section: Radiation Emission and Absorption-scattering Modelmentioning

confidence: 99%

Modeling the photocatalytic oxidation of carboxylic acids on aqueous TiO2 suspensions and on immobilized TiO2-chitosan thin films in different reactor geometries irradiated by UVA or UVC light sources

Grčić

Koprivanac

Puma

2021

Chemical Engineering Journal

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The sensitization effect of waste toner powder in the photocatalytic degradation of surfactant sodium dodecylbenzene sulfonate over immobilized TiO2–chitosan layer under UVC and solar irradiation

Cindrić

Grčić

Koprivanac

2018

Reac Kinet Mech Cat

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Kinetic study of salicylic acid photocatalytic degradation using sol–gel anatase thin film with enhanced long-term activity

Cited by 10 publications

References 40 publications

N-Doped TiO2-Nb2O5 Sol–Gel Catalysts: Synthesis, Characterization, Adsorption Capacity, Photocatalytic and Antioxidant Activity

N-Doped TiO2-Nb2O5 Sol–Gel Catalysts: Synthesis, Characterization, Adsorption Capacity, Photocatalytic and Antioxidant Activity

Modeling the photocatalytic oxidation of carboxylic acids on aqueous TiO2 suspensions and on immobilized TiO2-chitosan thin films in different reactor geometries irradiated by UVA or UVC light sources

The sensitization effect of waste toner powder in the photocatalytic degradation of surfactant sodium dodecylbenzene sulfonate over immobilized TiO2–chitosan layer under UVC and solar irradiation

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