UV-photoassisted degradation of phenyltin(IV) chlorides in water

Navı́o, J.A.; Cerrillos, C.; Pradera, M. A.; Morales, E.; Gómez-Ariza, José Luis

doi:10.1016/s1010-6030(96)04474-7

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…Among the different abiotic degradation processes, solar irradiation is one of the main factors responsible for TPT degradation in the environment. TPT was shown to be photodegraded to diphenyltin (DPT) by solar light or UV light 3 and, more recently, Navio et al 4 have shown that the UV-photoassisted degradation of TPT in water takes place by sequential dephenylation via DBT and monophenyltin (MPT). They identified some photoproducts and estimated the quantum yield Φ of TPT disappearance, in their conditions, as equal to 1.12 Â 10 À6 .…”

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Photoinduced degradation by iron(III): removal of triphenyltin chloride from water

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Astruc

et al. 2001

Applied Organom Chemis

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The photoredox process taking place in iron(III) aquacomplexes was used to cause the complete degradation of triphenyltin (TPT). TPT elimination was proved to come only from attack by hydroxyl radicals generated upon irradiation at 365 nm of Fe(H 2 O) 5 OH 2 , the iron(III) species present under the experimental conditions ([Fe(III)] in the range (3±6) Â 10 À4 mol l À1). The first step is the formation of an adduct between hydroxyl radicals and the benzene ring. The main process is a stepwise dephenylation of the starting TPT. Hydroxylated phenyltin derivatives were also formed, but only as minor photoproducts. The process was shown to be efficient with artificial light as well as with solar light.

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confidence: 99%

Photoinduced degradation by iron(III): removal of triphenyltin chloride from water

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Brand

Astruc

et al. 2001

Applied Organom Chemis

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“…For triphenyltin chloride, the results of the photoassisted degradation in the presence of TiO 2 fitted first-order kinetics. The rate constant of this photodegradation is shown in Table , together with the value of the same rate constant but in the absence of the catalyst (taken from ref ).…”

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“…As can be seen, the rate constant in the presence of TiO 2 is slightly lower than that in the absence of the semiconductor. This could be attributed in principle to the phenomena of reflection and loss of the light by the catalyst grains, to the adsorption of other productsalso susceptible to photocatalytic degradationon the surface, to the parallel photolytic degradation of the phenyltin compounds present in the aqueous medium, or to other derivatives also photocatalytically degradable by the action of UV light, and lastly to the effect of the intensity of light used. These results suggest that the working system is not photocatalytic at all but photochemical, with similar rate constants obtained with and without titania.…”

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confidence: 99%

“…In previous papers , we provided data about the mode of UV-photolytic degradation of butyltin chlorides 6 and phenyltin chlorides 7 in water, and some of the breakdown products were identified. Also the photoassisted degradation of n -butyltin chlorides in air-equilibrated aqueous TiO 2 suspension has been studied by us 8 as an alernative route to study the photochemical elimination of butyltin species by heterogeneous photocatalysis, since this technology has been shown to be an attractive process for the degradation of many water pollutants in the aquatic environment .…”

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Photoassisted Degradation (in the UV) of Phenyltin(IV) Chlorides in the Presence of Titanium Dioxide

et al. 1998

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The photoassisted degradation of phenyltin(IV) chlorides in air-equilibrated aqueous TiO2 suspension has been studied. The stability of the triphenyltin(IV) derivative in aqueous solutions at different pH values and the extent of adsorption of tri-and diphenyltin(IV) chloride species were examined. Particular interest is focused on the TiO2-assisted photodegradation of phenyltin species. Detailed surface analyses of the catalyst particles by IR and of the liquid medium by GC-MS are reported. A mechanism consisting of interfacial trapping of a photogenerated electron-hole pair can explain the TiO2-photoassisted degradation of phenyltin species. The results are compared with those previously reported on the photolytic degradation of theses species in water and with those of n-butyltin species (photolytic and TiO2-photoassisted). Our results allow that this is not a photocatalysis system but a photoassisted one in the presence of TiO2.

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“…However, many researchers have reported that the HO • attacks the majority of organic molecules in wastewater [11]. This radical is known to be slightly selective and has an electrophilic character to react on organics [14][15][16], organometallics [17][18][19], inorganic ions [16], proteins [20], agrichemicals [21,22] and dyes [4,5].…”

Section: Methodsmentioning

confidence: 99%

Comparison of advanced oxidation processes for degrading Ponceau S dye. Application of photo-Fenton process.

Laftani

Boussaoud

Chatib

et al. 2019

Maced. J. Chem. Chem. Eng.

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The major part of this work is devoted to the examination of the degradation of Ponceau S (PS) in aqueous medium by using the photo-Fenton process. The influence of pH of the medium, oxidant dose (H2O2), ferrous ion dose and the presence of inorganic ions such as bicarbonate, sulphate and nitrate on degradation kinetics was also analyzed. Before that, the efficiency of this process was compared to three other advanced oxidation processes (AOPs) such as H2O2/UV, Fenton (Fe2+/H2O2), and solar photo-Fenton. It was found that all dye degradation kinetics obeyed a pseudo-first order, and their apparent rate constants were represented by the ratios: kapp (H2O2/UV/Fe2+) =0.295 kapp (sunlight/Fe2+/H2O2) =0.141 kapp (Fe2+/H2O2) = 0.111 kapp (H2O2/UV) =0.031.Under reference conditions (0.06 mM of PS in ultrapure water), photo-Fenton oxidation using 0.06 mM of Fe2+, 1mM of H2O2 and the pH optimal value of 3 yielded more than 94.3% in only10 min of dye degradation with an apparent rate constant of 0.2951 min-1. Elsewhere, the addition of the salts in aqueous medium has, in general, an inhibition effect on the decolorization kinetics due to controlled ionic interactions of metals with inorganic ions. The most adverse effect on PS disappearance rate was observed when bicarbonate ions were present in the treated medium.

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UV-photoassisted degradation of phenyltin(IV) chlorides in water

Cited by 12 publications

References 8 publications

Photoinduced degradation by iron(III): removal of triphenyltin chloride from water

Photoinduced degradation by iron(III): removal of triphenyltin chloride from water

Photoassisted Degradation (in the UV) of Phenyltin(IV) Chlorides in the Presence of Titanium Dioxide

Comparison of advanced oxidation processes for degrading Ponceau S dye. Application of photo-Fenton process.

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