Photocatalytic degradation of hazardous Food Yellow 13 in TiO2 and ZnO aqueous and river water suspensions

“…Until now the majority of research on QPH has been limited to identifying potential cellular toxicity and developing assays for analysis. Especially the matter of its biocompatibility has long been a subject of debate 17 – 19 . However, to the best of our knowledge, there exists only one photodynamics study of the molecule in pH 12 water conducted in the nanosecond scale 15 .…”

Section: Introductionmentioning

confidence: 99%

Shedding new light on an old molecule: quinophthalone displays uncommon N-to-O excited state intramolecular proton transfer (ESIPT) between photobases

Han

Hwang

Lee

et al. 2017

Sci Rep

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Excited state dynamics of common yellow dye quinophthalone (QPH) was probed by femtosecond transient absorption spectroscopy. Multi-exponential decay of the excited state and significant change of rate constants upon deuterium substitution indicate that uncommon nitrogen-to-oxygen excited state intramolecular proton transfer (ESIPT) occurs. By performing density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations, we found that adiabatic surface crossing between the S1 and S2 states takes place in the photoreaction. Unlike most cases of ESIPT, QPH does not exhibit tautomer emission, possibly due to internal conversion or back-proton transfer. The ESIPT of QPH presents a highly interesting case also because the moieties participating in ESIPT, quinoline and aromatic carbonyl, are both traditionally considered as photobases.

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“…Very few researchers have reported the degradation of titan yellow by photo catalysis using green synthesized ZnO. Studies on discoloration of direct yellow 9 by Elhbieta Regulska [14] using ZnO and TiO 2 nanoparticles report that ZnO photo degrades Direct Yellow 9 with twice the efficiency as compared to titanium dioxide. There are several reports on degradation of titan yellow dye using other photocatalysts such as TiO 2 [15], α-Fe 2 O 3, γ-Fe 2 O 3 [16].…”

Section: Introductionmentioning

confidence: 99%

Photo-assisted mineralisation of titan yellow dye using ZnO nanorods synthesised via environmental benign route

Vidya¹,

Manjunatha

Sudeep³

et al. 2020

SN Appl. Sci.

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Green synthesis of metal oxide nanoparticles using plant extract is a most promising substitute for regular methods that involve chemical synthesis approach. The present study reports the synthesis of ZnO nano rods (ZNRs) using Calotropis gigantea, a plant rich in flavonoids and alkaloids and their application as a photocatalyst in the degradation of titan yellow dye. The synthesized ZNRs were characterized using XRD, FESEM-EDS and HRTEM-SAED. The XRD results confirm the formation of wurtzite ZnO. The FESEM images confirmed that ZNRs have length ranging from 20 to 200 nm, diameter ranging between 20 and 80 nm and width between 20 and 50 nm. The bio-synthesized ZNRs were used for photo-degradation of titan yellow dye, one of the main effluents from textile industries, discharged directly into water bodies. The ZNRs exhibited 95% dye degradation for 10 ppm TY dye concentration in the presence of 60 mg of the ZNRs catalyst at pH 8 for 60 min UV irradiation. The present study reports eco-friendly method for the synthesis of ZNRs and its efficiency as a photo catalyst in the advanced photo assisted oxidation process for degradation of titan yellow dye.

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Photocatalytic degradation of hazardous Food Yellow 13 in TiO2 and ZnO aqueous and river water suspensions

Cited by 25 publications

References 46 publications

Solar photocatalytic decomposition of ethyl paraben in zinc oxide suspensions

Solar photocatalytic decomposition of ethyl paraben in zinc oxide suspensions

Shedding new light on an old molecule: quinophthalone displays uncommon N-to-O excited state intramolecular proton transfer (ESIPT) between photobases

Photo-assisted mineralisation of titan yellow dye using ZnO nanorods synthesised via environmental benign route

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