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Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol

The present study reports a facile method to prepare carbon quantum dots (CQDs) via hydrothermal treatment using human fingernails as a green precursor. Fingernails derived CQDs (FN-CQDs) could selectively detect copper ions (Cu2+) at the concentration as low as 1 nM. Different weightage of FN-CQDs...

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Main Authors: Tai, Jun Yan, Leong, Kah Hon, Saravanan, Pichiah, Tan, Sin Tee, Chong, Woon Chan, Sim, Lan Ching
Format: Article
Published: Elsevier 2021
Online Access:http://psasir.upm.edu.my/id/eprint/97259/
https://linkinghub.elsevier.com/retrieve/pii/S2213343720309714
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spelling my.upm.eprints.972592024-07-29T06:30:41Z http://psasir.upm.edu.my/id/eprint/97259/ Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol Tai, Jun Yan Leong, Kah Hon Saravanan, Pichiah Tan, Sin Tee Chong, Woon Chan Sim, Lan Ching The present study reports a facile method to prepare carbon quantum dots (CQDs) via hydrothermal treatment using human fingernails as a green precursor. Fingernails derived CQDs (FN-CQDs) could selectively detect copper ions (Cu2+) at the concentration as low as 1 nM. Different weightage of FN-CQDs (30 wt%, 40 wt% and 50 wt%) were coupled with pure graphitic carbon nitride (g-C3N4) to remove 2,4-dicholorophenol (2,4-DCP) under sunlight irradiation. The composite loaded with 50 wt% of FN-CQD removed 100 % of 2,4-DCP in 75 min, which was almost 2 times higher than g-C3N4. The photocatalytic performance was in agreement with ultraviolet–visible diffuse reflectance spectra (UV–vis DRS) in which the photosensitizing effect was significantly exerted by 50 wt% of CQDs. In the presence of FN-CQDs, g-C3N4 was sensitized by sunlight with an average light intensity of ∼ 937 × 100 lx to donate more electrons for the generation of oxidizing radicals. Excessive loading of FN-CQDs (up to 50 wt%) created trap state that decreased the charge carrier transport in FN-CQDs/g-C3N4(50). Such drawbacks did not affect the overall performance of FN-CQDs/g-C3N4(50). The higher loading of FN-CQDs exerted stronger photosensitizing effects to overcome the limitation of high recombination rate of charge carriers and lower surface area. FN-CQDs could act as photosensitizer to increase the light absorption range to generate more electron and holes. It also served as electron reservoir for the reduction of oxygen molecule to produce superoxide anion radical (radical dotO2−). Scavenging tests identified that radical dotO2− was the most active radical in the photodegradation of 2,4-DCP. Elsevier 2021-02 Article PeerReviewed Tai, Jun Yan and Leong, Kah Hon and Saravanan, Pichiah and Tan, Sin Tee and Chong, Woon Chan and Sim, Lan Ching (2021) Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol. Journal of Environmental Chemical Engineering, 9 (1). 104622 - 104632. ISSN 2213-3437 https://linkinghub.elsevier.com/retrieve/pii/S2213343720309714 10.1016/j.jece.2020.104622
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description The present study reports a facile method to prepare carbon quantum dots (CQDs) via hydrothermal treatment using human fingernails as a green precursor. Fingernails derived CQDs (FN-CQDs) could selectively detect copper ions (Cu2+) at the concentration as low as 1 nM. Different weightage of FN-CQDs (30 wt%, 40 wt% and 50 wt%) were coupled with pure graphitic carbon nitride (g-C3N4) to remove 2,4-dicholorophenol (2,4-DCP) under sunlight irradiation. The composite loaded with 50 wt% of FN-CQD removed 100 % of 2,4-DCP in 75 min, which was almost 2 times higher than g-C3N4. The photocatalytic performance was in agreement with ultraviolet–visible diffuse reflectance spectra (UV–vis DRS) in which the photosensitizing effect was significantly exerted by 50 wt% of CQDs. In the presence of FN-CQDs, g-C3N4 was sensitized by sunlight with an average light intensity of ∼ 937 × 100 lx to donate more electrons for the generation of oxidizing radicals. Excessive loading of FN-CQDs (up to 50 wt%) created trap state that decreased the charge carrier transport in FN-CQDs/g-C3N4(50). Such drawbacks did not affect the overall performance of FN-CQDs/g-C3N4(50). The higher loading of FN-CQDs exerted stronger photosensitizing effects to overcome the limitation of high recombination rate of charge carriers and lower surface area. FN-CQDs could act as photosensitizer to increase the light absorption range to generate more electron and holes. It also served as electron reservoir for the reduction of oxygen molecule to produce superoxide anion radical (radical dotO2−). Scavenging tests identified that radical dotO2− was the most active radical in the photodegradation of 2,4-DCP.
format Article
author Tai, Jun Yan
Leong, Kah Hon
Saravanan, Pichiah
Tan, Sin Tee
Chong, Woon Chan
Sim, Lan Ching
spellingShingle Tai, Jun Yan
Leong, Kah Hon
Saravanan, Pichiah
Tan, Sin Tee
Chong, Woon Chan
Sim, Lan Ching
Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol
author_facet Tai, Jun Yan
Leong, Kah Hon
Saravanan, Pichiah
Tan, Sin Tee
Chong, Woon Chan
Sim, Lan Ching
author_sort Tai, Jun Yan
title Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol
title_short Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol
title_full Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol
title_fullStr Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol
title_full_unstemmed Facile green synthesis of fingernails derived carbon quantum dots for Cu2sensing and photodegradation of 2,4-dichlorophenol
title_sort facile green synthesis of fingernails derived carbon quantum dots for cu2sensing and photodegradation of 2,4-dichlorophenol
publisher Elsevier
publishDate 2021
url http://psasir.upm.edu.my/id/eprint/97259/
https://linkinghub.elsevier.com/retrieve/pii/S2213343720309714
_version_ 1806415623819886592
score 13.211869

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