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Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4

Emerging contaminants such as diclofenac is frequently detected in wastewater treatment plants because they are not specifically designed for pharmaceutical removal, which results in poor removal efficiency. Even though photocatalysis has emerged as a promising alternative, most of the reported phot...

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Main Author: JOHN JAYABALAN, PRASENNA
Format: Thesis
Language:English
Published: 2021
Subjects:
TP Chemical technology
Online Access:http://utpedia.utp.edu.my/22791/1/Prasenna_18001892.pdf
http://utpedia.utp.edu.my/22791/
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spelling my-utp-utpedia.227912022-02-27T04:31:29Z http://utpedia.utp.edu.my/22791/ Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4 JOHN JAYABALAN, PRASENNA TP Chemical technology Emerging contaminants such as diclofenac is frequently detected in wastewater treatment plants because they are not specifically designed for pharmaceutical removal, which results in poor removal efficiency. Even though photocatalysis has emerged as a promising alternative, most of the reported photocatalyst are UV light driven, portrays fast recombination rate of electron-hole pair and has slow electron mobility. In order to overcome these shortcomings, in the present work, visible light-driven TiO2/g-C3N4 photocatalyst was synthesized for the photodegradation of diclofenac in aqueous solution. The morphological and optical properties of the photocatalyst were analyzed in which the formation of rutile phase TiO2 and improved band gap energy (3.18eV to 2.81eV) was clearly observed. The photodegradation efficiency was improved even at low catalyst loading (0.3g) within a period of 90 minutes, indicating the Z-scheme photocatalyst, successfully overcame the electron-hole pair's fast recombination rate. The photodegradation efficiency was represented as a function of all independent variables (irradiation time, initial solution pH, initial diclofenac concentration and catalyst loading), using a second-order quadratic model. Response surface methodology (RSM) was used to optimize the degradation process. A maximum degradation efficiency (93.49%) was achieved at the optimum conditions (irradiation time = 90min, initial solution pH = 5, initial diclofenac concentration = 5ppm and catalyst loading = 0.3g). The as developed photocatalyst also portrays good recyclability and stability as it showed consistent degradation over 5 cycles. The process followed a pseudo-first-order reaction. Photodegradation of diclofenac also resulted in ten intermediates via various processes such as oxidative displacements, hydroxylation, decarboxylation and cyclization as identified using LCMS-MS analysis. 2021-10 Thesis NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/22791/1/Prasenna_18001892.pdf JOHN JAYABALAN, PRASENNA (2021) Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4. Masters thesis, Universiti Teknologi PETRONAS.
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Electronic and Digitized Intellectual Asset
url_provider http://utpedia.utp.edu.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
JOHN JAYABALAN, PRASENNA
Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4
description Emerging contaminants such as diclofenac is frequently detected in wastewater treatment plants because they are not specifically designed for pharmaceutical removal, which results in poor removal efficiency. Even though photocatalysis has emerged as a promising alternative, most of the reported photocatalyst are UV light driven, portrays fast recombination rate of electron-hole pair and has slow electron mobility. In order to overcome these shortcomings, in the present work, visible light-driven TiO2/g-C3N4 photocatalyst was synthesized for the photodegradation of diclofenac in aqueous solution. The morphological and optical properties of the photocatalyst were analyzed in which the formation of rutile phase TiO2 and improved band gap energy (3.18eV to 2.81eV) was clearly observed. The photodegradation efficiency was improved even at low catalyst loading (0.3g) within a period of 90 minutes, indicating the Z-scheme photocatalyst, successfully overcame the electron-hole pair's fast recombination rate. The photodegradation efficiency was represented as a function of all independent variables (irradiation time, initial solution pH, initial diclofenac concentration and catalyst loading), using a second-order quadratic model. Response surface methodology (RSM) was used to optimize the degradation process. A maximum degradation efficiency (93.49%) was achieved at the optimum conditions (irradiation time = 90min, initial solution pH = 5, initial diclofenac concentration = 5ppm and catalyst loading = 0.3g). The as developed photocatalyst also portrays good recyclability and stability as it showed consistent degradation over 5 cycles. The process followed a pseudo-first-order reaction. Photodegradation of diclofenac also resulted in ten intermediates via various processes such as oxidative displacements, hydroxylation, decarboxylation and cyclization as identified using LCMS-MS analysis.
format Thesis
author JOHN JAYABALAN, PRASENNA
author_facet JOHN JAYABALAN, PRASENNA
author_sort JOHN JAYABALAN, PRASENNA
title Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4
title_short Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4
title_full Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4
title_fullStr Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4
title_full_unstemmed Photodegradation of Diclofenac in Aqueous Solution using Visible Light driven TiO2/g-C3N4
title_sort photodegradation of diclofenac in aqueous solution using visible light driven tio2/g-c3n4
publishDate 2021
url http://utpedia.utp.edu.my/22791/1/Prasenna_18001892.pdf
http://utpedia.utp.edu.my/22791/
_version_ 1739832991123767296
score 13.211869

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