Photocatalytic transformation of organic compounds in the presence of inorganic ions

Calza, Paola; Pelizzetti, Ezio

doi:10.1351/pac200173121839

Cited by 116 publications

(65 citation statements)

References 23 publications

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“…Radical scavenging as a result of the presence of such compounds has been linked to a decrease in various photocatalytic degradation studies, in particular when raw water samples were used. [11,56] However, COD was removed up to 46.7 % upon photocatalysis compared to only 23.3 % under direct photolysis, indicating the presence of considerable amounts of carbonaceous materials, which had not been completely oxidised and mineralised to CO 2 and H 2 O. The pH of the RW samples was not significantly affected throughout the course of the irradiation (Table 2), which suggests a buffering capacity of natural freshwater as already proposed by Agüera and co-workers.…”

Section: Effect Of Cooling Jacket Materials and Tio 2 Typementioning

confidence: 99%

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Kanakaraju¹,

Cherie²,

Motti³

et al. 2014

Environ. Chem.

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Environmental context. Diclofenac, a common non-steroidal anti-inflammatory drug, is not completely removed from surface and drinking water by conventional treatment methods. Consequently, this drug is present in the aquatic environment and has been subsequently linked to toxic effects on organisms. We show that photolysis and TiO 2 -catalysed degradation in circulating batch reactors efficiently results in diclofenac removal under a variety of conditions. These photochemical methods thus may lead to more effective water treatment processes.Abstract. The occurrence of diclofenac (DCF) as an emerging pollutant in surface waters and drinking water has been attributed to elevated global consumption and the inability of sewage treatment plants to remove DCF. In this study, DCF spiked drinking water and river water was subjected to photolysis and TiO 2 photocatalytic treatments in a circulating laboratory-scale (immersion-well) and a demonstration-scale loop reactor (Laboclean). The operational parameters for the immersion-well reactor were optimised as follows: TiO 2 P25 loading, 0.1 g L À1 ; natural pH, 6.2; initial concentration, 30 mg L À1 ; water type, distilled water. Complete DCF removal was realised within 15 min under the optimised conditions using the immersion-well reactor. Sunlight-mediated photochemical degradation required a prolonged exposure period of up to 360 min for complete DCF removal. DCF in distilled and drinking water was efficiently degraded in the larger Laboclean reactor. Differences were, however, observed based on their pseudo-first-order rate constants, which implies that the water matrix has an effect on the degradation rate. Six major photoproducts, 2-(8-chloro-9H-carbazol-1-yl)acetic acid, 2-(8-hydroxy-9H-carbazol-1-yl)acetic acid, 2,6-dichloro-N-o-tolylbenzenamine, 2-(phenylamino)benzaldehyde, 1-chloromethyl-9H-carbazole and 1-methyl-9H-carbazole, generated from TiO 2 photocatalysis of DCF were identified by liquid chromatography-mass spectrometry (LCMS) and Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS). This work has shown that photocatalytic degradation kinetics of DCF are dependent on both the geometry of the photoreactor and the nature of the water matrices.

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Section: Effect Of Cooling Jacket Materials and Tio 2 Typementioning

confidence: 99%

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Kanakaraju¹,

Cherie²,

Motti³

et al. 2014

Environ. Chem.

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“…The effect of surfactants (0.05 mmol/L) on the degradation rate of phenol was reported to be sodium dodecyl benzene sulfate>sodium dodecyl sulfonate>sodium dodecyl sulfate (SDS). The presence of anions is reported to alter the ionic strength of the solution, and therefore, influence the catalytic activity, and hence the photocatalytic degradation (Calza and Pelizzetti 2001). The reaction of h vb+ and .…”

Section: ð6:4þmentioning

confidence: 99%

Advances in Heterogeneous Photocatalytic Degradation of Phenols and Dyes in Wastewater: A Review

Ahmed

Rasul

Martens

et al. 2010

Water Air Soil Pollut

367

138

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The heterogeneous photocatalytic water purification process has gained wide attention due to its effectiveness in degrading and mineralizing the recalcitrant organic compounds as well as the possibility of utilizing the solar UV and visible light spectrum. This paper aims to review and summarize the recently published works in the field of photocatalytic oxidation of toxic organic compounds such as phenols and dyes, predominant in wastewater effluent. In this review, the effects of various operating parameters on the photocatalytic degradation of phenols and dyes are presented. Recent findings suggested that different parameters, such as type of photocatalyst and composition, light intensity, initial substrate concentration, amount of catalyst, pH of the reaction medium, ionic components in water, solvent types, oxidizing agents/ electron acceptors, mode of catalyst application, and calcinations temperature can play an important role on the photocatalytic degradation of organic compounds in water environment. Extensive research has focused on the enhancement of photocatalysis by modification of TiO 2 employing metal, non-metal, and ion doping. Recent advances in TiO 2 photocatalysis for the degradation of various phenols and dyes are also highlighted in this review.

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“…Ammonium oxalate (AO) was used as a scavenger for holes (h + ) [28][29][30], isopropanol (ISP) was used for hydroxyl radicals (OH • ) [31][32][33][34] and p-benzoquinone (BQ) was used for superoxide radical anion (O 2…”

Section: Photocatalytic Activity For Av 7 Degradation and The Activementioning

confidence: 99%

A stable, efficient and reusable CdS–SnO2 heterostructured photocatalyst for the mineralization of Acid Violet 7 dye

Ghugal

Umare

Sasikala

2015

Applied Catalysis A: General

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Photocatalytic transformation of organic compounds in the presence of inorganic ions

Cited by 116 publications

References 23 publications

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Advances in Heterogeneous Photocatalytic Degradation of Phenols and Dyes in Wastewater: A Review

A stable, efficient and reusable CdS–SnO2 heterostructured photocatalyst for the mineralization of Acid Violet 7 dye

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