Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract

A novel TiO2 nanoparticle was prepared through green synthesis using Calotropis gigantea (CG) leaf extract. Morphological analysis showed dispersed spherical CG-TiO2 nanoparticles with an average size of 42 nm. The prepared catalyst was used for the degradation of metformin (a widely used diabetic m...

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Autores principales:	Venkatesan Prashanth, Kumari Priyanka, Neelancherry Remya
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	calotropis gigantea cg-tio2 green synthesis metformin optimization solar photocatalysis Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/2466eccce5bc474891c07a9ef7f9a6fb
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spelling	oai:doaj.org-article:2466eccce5bc474891c07a9ef7f9a6fb2021-11-06T10:50:46ZSolar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract0273-12231996-973210.2166/wst.2021.040https://doaj.org/article/2466eccce5bc474891c07a9ef7f9a6fb2021-03-01T00:00:00Zhttp://wst.iwaponline.com/content/83/5/1072https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732A novel TiO2 nanoparticle was prepared through green synthesis using Calotropis gigantea (CG) leaf extract. Morphological analysis showed dispersed spherical CG-TiO2 nanoparticles with an average size of 42 nm. The prepared catalyst was used for the degradation of metformin (a widely used diabetic medicine) by solar photocatalysis. A three-factor central composite design (CCD) was used to explore the effect of independent variables, i.e., pH 3–7, metformin concentration 1–10 mg/L, and catalyst (CG-TiO2) dosage 0.5–2.0 g/L. A maximum metformin degradation of 96.7% was observed under optimum conditions i.e., pH = 9.7, initial metformin concentration = 9.7 mg/L and catalyst dosage = 0.7 g/L, with ∼86% mineralization efficiency. A quadratic model with an error <±5% was developed to predict the metformin degradation and the rate of degradation under the optimum conditions followed pseudo-first-order kinetics (k = 0.014/min). CG-TiO2 exhibited higher metformin degradation efficiency (96.7%) compared to P-25 (23.9%) at optimum conditions. The recyclability study indicated effective reuse of the catalyst for up to three cycles. The proposed metformin degradation route is hydroxyl radical (•OH) generation on the CG-TiO2 surface, transfer of •OH to the aqueous phase from CG-TiO2 and subsequent oxidation of metformin in the aqueous phase.Venkatesan PrashanthKumari PriyankaNeelancherry RemyaIWA Publishingarticlecalotropis giganteacg-tio2green synthesismetforminoptimizationsolar photocatalysisEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 5, Pp 1072-1084 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	calotropis gigantea cg-tio2 green synthesis metformin optimization solar photocatalysis Environmental technology. Sanitary engineering TD1-1066
spellingShingle	calotropis gigantea cg-tio2 green synthesis metformin optimization solar photocatalysis Environmental technology. Sanitary engineering TD1-1066 Venkatesan Prashanth Kumari Priyanka Neelancherry Remya Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract
description	A novel TiO2 nanoparticle was prepared through green synthesis using Calotropis gigantea (CG) leaf extract. Morphological analysis showed dispersed spherical CG-TiO2 nanoparticles with an average size of 42 nm. The prepared catalyst was used for the degradation of metformin (a widely used diabetic medicine) by solar photocatalysis. A three-factor central composite design (CCD) was used to explore the effect of independent variables, i.e., pH 3–7, metformin concentration 1–10 mg/L, and catalyst (CG-TiO2) dosage 0.5–2.0 g/L. A maximum metformin degradation of 96.7% was observed under optimum conditions i.e., pH = 9.7, initial metformin concentration = 9.7 mg/L and catalyst dosage = 0.7 g/L, with ∼86% mineralization efficiency. A quadratic model with an error <±5% was developed to predict the metformin degradation and the rate of degradation under the optimum conditions followed pseudo-first-order kinetics (k = 0.014/min). CG-TiO2 exhibited higher metformin degradation efficiency (96.7%) compared to P-25 (23.9%) at optimum conditions. The recyclability study indicated effective reuse of the catalyst for up to three cycles. The proposed metformin degradation route is hydroxyl radical (•OH) generation on the CG-TiO2 surface, transfer of •OH to the aqueous phase from CG-TiO2 and subsequent oxidation of metformin in the aqueous phase.
format	article
author	Venkatesan Prashanth Kumari Priyanka Neelancherry Remya
author_facet	Venkatesan Prashanth Kumari Priyanka Neelancherry Remya
author_sort	Venkatesan Prashanth
title	Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract
title_short	Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract
title_full	Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract
title_fullStr	Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract
title_full_unstemmed	Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract
title_sort	solar photocatalytic degradation of metformin by tio2 synthesized using calotropis gigantea leaf extract
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/2466eccce5bc474891c07a9ef7f9a6fb
work_keys_str_mv	AT venkatesanprashanth solarphotocatalyticdegradationofmetforminbytio2synthesizedusingcalotropisgigantealeafextract AT kumaripriyanka solarphotocatalyticdegradationofmetforminbytio2synthesizedusingcalotropisgigantealeafextract AT neelancherryremya solarphotocatalyticdegradationofmetforminbytio2synthesizedusingcalotropisgigantealeafextract
_version_	1718443781773066240

Solar photocatalytic degradation of metformin by TiO2 synthesized using Calotropis gigantea leaf extract

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