Staff View: Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation

Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation

A series of carbon dots (CDs) modified g-C3N4 (xCDs/g-C3N4; x = 0.5, 1.0, and 1.5 mL CDs solution) was synthesized via the microwave-assisted hydrothermal synthesis method for the photooxidation of bisphenol-A (BPA) under visible light irradiation. The X-ray diffraction (XRD) analysis indicates that...

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Main Authors:	Iqbal, Anwar, Shittu, Fatimah Bukola, Mohamad Ibrahim, Mohamad Nasir, Abu Bakar, N. H. H., Yahaya, Noorfatimah, Rajappan, Kalaivizhi, Hussin, Mohd. Hazwan, Danial, Wan Hazman, Wilson, Lee D.
Format:	Article
Language:	English English
Published:	Multidisciplinary Digital Publishing Institute (MDPI) 2022
Subjects:	QD Chemistry
Online Access:	http://irep.iium.edu.my/101534/7/101534_Photoreactive%20carbon%20dots%20modified%20g-C3N4_SCOPUS.pdf http://irep.iium.edu.my/101534/8/101534_Photoreactive%20carbon%20dots%20modified%20g-C3N4.pdf http://irep.iium.edu.my/101534/ https://www.mdpi.com/2073-4344/12/11/1311/pdf?version=1667801502 https://doi.org/10.3390/catal12111311
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spelling	my.iium.irep.1015342022-12-02T03:21:31Z http://irep.iium.edu.my/101534/ Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation Iqbal, Anwar Shittu, Fatimah Bukola Mohamad Ibrahim, Mohamad Nasir Abu Bakar, N. H. H. Yahaya, Noorfatimah Rajappan, Kalaivizhi Hussin, Mohd. Hazwan Danial, Wan Hazman Wilson, Lee D. QD Chemistry A series of carbon dots (CDs) modified g-C3N4 (xCDs/g-C3N4; x = 0.5, 1.0, and 1.5 mL CDs solution) was synthesized via the microwave-assisted hydrothermal synthesis method for the photooxidation of bisphenol-A (BPA) under visible light irradiation. The X-ray diffraction (XRD) analysis indicates that the CDs may have a turbostratic structure and the resulting photocatalysts have distorted crystal structure, as compared with pure g-C3N4. The high-resolution transmission electron microscope (HR-TEM) analysis revealed amorphous, mono-disperse, spherical CDs with an average particle size of 3.75 nm. The distribution of CDs within the matrix of g-C3N4 appear as small dark dot-like domains. The N2 adsorption-desorption analysis indicates that the nanocomposites are mesoporous with a density functional theory (DFT) estimate of the pore size distribution between 2–13 nm. The CDs quantum yield (QY) was determined to be 12% using the UV-vis spectral analysis, where the CDs/g-C3N4 has improved absorption in the visible region than g-C3N4. The higher BET surface area of CDs/g-C3N4 provided more adsorption sites and the ability to yield photogenerated e−/h+ pairs, which caused the 1.5 CDs/g-C3N4 to have better photocatalytic efficiency compared to the rest of the systems. The highest removal, 90%, was achieved at the following optimum conditions: BPA initial concentration = 20 mg L−1, catalyst dosage = 30 mg L−1, and pH = 10. The photooxidation process is mainly driven by photogenerated holes (h+) followed by •OH and O2•−. The synthesis of the 1.5 CDs/g-C3N4 system is simple and cost-effective, where this photocatalyst is highly stable and reusable versus other systems reported in the literature. Multidisciplinary Digital Publishing Institute (MDPI) 2022-10-25 Article PeerReviewed application/pdf en http://irep.iium.edu.my/101534/7/101534_Photoreactive%20carbon%20dots%20modified%20g-C3N4_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/101534/8/101534_Photoreactive%20carbon%20dots%20modified%20g-C3N4.pdf Iqbal, Anwar and Shittu, Fatimah Bukola and Mohamad Ibrahim, Mohamad Nasir and Abu Bakar, N. H. H. and Yahaya, Noorfatimah and Rajappan, Kalaivizhi and Hussin, Mohd. Hazwan and Danial, Wan Hazman and Wilson, Lee D. (2022) Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation. Catalysts, 12. ISSN 2073-4344 https://www.mdpi.com/2073-4344/12/11/1311/pdf?version=1667801502 https://doi.org/10.3390/catal12111311
institution	Universiti Islam Antarabangsa Malaysia
building	IIUM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	International Islamic University Malaysia
content_source	IIUM Repository (IREP)
url_provider	http://irep.iium.edu.my/
language	English English
topic	QD Chemistry
spellingShingle	QD Chemistry Iqbal, Anwar Shittu, Fatimah Bukola Mohamad Ibrahim, Mohamad Nasir Abu Bakar, N. H. H. Yahaya, Noorfatimah Rajappan, Kalaivizhi Hussin, Mohd. Hazwan Danial, Wan Hazman Wilson, Lee D. Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation
description	A series of carbon dots (CDs) modified g-C3N4 (xCDs/g-C3N4; x = 0.5, 1.0, and 1.5 mL CDs solution) was synthesized via the microwave-assisted hydrothermal synthesis method for the photooxidation of bisphenol-A (BPA) under visible light irradiation. The X-ray diffraction (XRD) analysis indicates that the CDs may have a turbostratic structure and the resulting photocatalysts have distorted crystal structure, as compared with pure g-C3N4. The high-resolution transmission electron microscope (HR-TEM) analysis revealed amorphous, mono-disperse, spherical CDs with an average particle size of 3.75 nm. The distribution of CDs within the matrix of g-C3N4 appear as small dark dot-like domains. The N2 adsorption-desorption analysis indicates that the nanocomposites are mesoporous with a density functional theory (DFT) estimate of the pore size distribution between 2–13 nm. The CDs quantum yield (QY) was determined to be 12% using the UV-vis spectral analysis, where the CDs/g-C3N4 has improved absorption in the visible region than g-C3N4. The higher BET surface area of CDs/g-C3N4 provided more adsorption sites and the ability to yield photogenerated e−/h+ pairs, which caused the 1.5 CDs/g-C3N4 to have better photocatalytic efficiency compared to the rest of the systems. The highest removal, 90%, was achieved at the following optimum conditions: BPA initial concentration = 20 mg L−1, catalyst dosage = 30 mg L−1, and pH = 10. The photooxidation process is mainly driven by photogenerated holes (h+) followed by •OH and O2•−. The synthesis of the 1.5 CDs/g-C3N4 system is simple and cost-effective, where this photocatalyst is highly stable and reusable versus other systems reported in the literature.
format	Article
author	Iqbal, Anwar Shittu, Fatimah Bukola Mohamad Ibrahim, Mohamad Nasir Abu Bakar, N. H. H. Yahaya, Noorfatimah Rajappan, Kalaivizhi Hussin, Mohd. Hazwan Danial, Wan Hazman Wilson, Lee D.
author_facet	Iqbal, Anwar Shittu, Fatimah Bukola Mohamad Ibrahim, Mohamad Nasir Abu Bakar, N. H. H. Yahaya, Noorfatimah Rajappan, Kalaivizhi Hussin, Mohd. Hazwan Danial, Wan Hazman Wilson, Lee D.
author_sort	Iqbal, Anwar
title	Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation
title_short	Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation
title_full	Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation
title_fullStr	Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation
title_full_unstemmed	Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation
title_sort	photoreactive carbon dots modified g-c3n4 for effective photooxidation of bisphenol-a under visible light irradiation
publisher	Multidisciplinary Digital Publishing Institute (MDPI)
publishDate	2022
url	http://irep.iium.edu.my/101534/7/101534_Photoreactive%20carbon%20dots%20modified%20g-C3N4_SCOPUS.pdf http://irep.iium.edu.my/101534/8/101534_Photoreactive%20carbon%20dots%20modified%20g-C3N4.pdf http://irep.iium.edu.my/101534/ https://www.mdpi.com/2073-4344/12/11/1311/pdf?version=1667801502 https://doi.org/10.3390/catal12111311
_version_	1751535941817729024
score	13.211869

Photoreactive carbon dots modified g-C3N4 for effective photooxidation of bisphenol-A under visible light irradiation

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