Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

doi:10.1016/j.cjche.2021.10.021

Chinese Journal of Chemical Engineering ›› 2022, Vol. 51 ›› Issue (11): 21-34.DOI: 10.1016/j.cjche.2021.10.021

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Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

Zeng Wei Heng¹, Woon Chan Chong^1,2, Yean Ling Pang^1,2, Lan Ching Sim¹, Chai Hoon Koo¹

1. Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Sungai Long Campus, Jalan Sungai Long, Cheras, 43000 Kajang, Selangor, Malaysia;
2. Centre for Photonics and Advanced Materials Research, Universiti Tunku Abdul Rahman, Sungai Long Campus, Jalan Sungai Long, Cheras, 43000 Kajang, Selangor, Malaysia

Received:2021-08-13 Revised:2021-09-28 Online:2023-01-18 Published:2022-11-18
Contact: Woon Chan Chong,E-mail:chongwoonchan@gmail.com
Supported by:
The authors would like to express their gratitude towards the funding provided by Universiti Tunku Abdul Rahman Research fund (IPSR/RMC/UTARRF/2020-C2/C06) and Centre for Photonics and Advanced Materials Research (CPAMR, UTAR) for their support.

Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

Zeng Wei Heng¹, Woon Chan Chong^1,2, Yean Ling Pang^1,2, Lan Ching Sim¹, Chai Hoon Koo¹

1. Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Sungai Long Campus, Jalan Sungai Long, Cheras, 43000 Kajang, Selangor, Malaysia;
2. Centre for Photonics and Advanced Materials Research, Universiti Tunku Abdul Rahman, Sungai Long Campus, Jalan Sungai Long, Cheras, 43000 Kajang, Selangor, Malaysia

通讯作者: Woon Chan Chong,E-mail:chongwoonchan@gmail.com
基金资助:
The authors would like to express their gratitude towards the funding provided by Universiti Tunku Abdul Rahman Research fund (IPSR/RMC/UTARRF/2020-C2/C06) and Centre for Photonics and Advanced Materials Research (CPAMR, UTAR) for their support.

Abstract

Abstract: The present work suggested the use of waste oil palm frond as an alternative precursor for nitrogen-doped carbon quantum dots (NCQDs) and proposed a straightforward in-situ hydrothermal method for the preparation of NCQDs/TiO₂ nanocomposites. The elemental composition, morphological, structural and optical characteristics of NCQDs/TiO₂ nanocomposites have been comprehensively investigated. The successful grafting of NCQDs on TiO₂ matrix was confirmed by the formation of TiOC bond and the electronic coupling between the π-states of NCQDs and the conduction band of TiO₂. For the first time, the oil palm frond-derived NCQDs/TiO₂ was adopted in the photodegradation of methylene blue (MB) under visible-light irradiation. As a result, the photocatalytic efficiency of NCQDs/TiO₂ nanocomposites (86.16%) was 2.85 times higher than its counterpart TiO₂ (30.18%). The enhanced performance of nanocomposites was attributed to the pivotal roles of NCQDs serving as electron mediator and visible-light harvester. Besides, the optimal NCQDs loading was determined at 4 ml while the removal efficiency of NCQDs/TiO₂-4 was the highest at a catalyst dosage of 1 g·L^-1 under alkaline condition. This research work is important as it proposed a new insight to the preparation of biomass-based NCQDs/TiO₂ using a facile synthetic method, which offers a green and sustainable water remediation technology.

Key words: Oil palm frond biomass, N-doped carbon quantum dots, Titanium-dioxide, In-situ hydrothermal, Visible light photocatalysis, Methylene blue

摘要： The present work suggested the use of waste oil palm frond as an alternative precursor for nitrogen-doped carbon quantum dots (NCQDs) and proposed a straightforward in-situ hydrothermal method for the preparation of NCQDs/TiO₂ nanocomposites. The elemental composition, morphological, structural and optical characteristics of NCQDs/TiO₂ nanocomposites have been comprehensively investigated. The successful grafting of NCQDs on TiO₂ matrix was confirmed by the formation of TiOC bond and the electronic coupling between the π-states of NCQDs and the conduction band of TiO₂. For the first time, the oil palm frond-derived NCQDs/TiO₂ was adopted in the photodegradation of methylene blue (MB) under visible-light irradiation. As a result, the photocatalytic efficiency of NCQDs/TiO₂ nanocomposites (86.16%) was 2.85 times higher than its counterpart TiO₂ (30.18%). The enhanced performance of nanocomposites was attributed to the pivotal roles of NCQDs serving as electron mediator and visible-light harvester. Besides, the optimal NCQDs loading was determined at 4 ml while the removal efficiency of NCQDs/TiO₂-4 was the highest at a catalyst dosage of 1 g·L^-1 under alkaline condition. This research work is important as it proposed a new insight to the preparation of biomass-based NCQDs/TiO₂ using a facile synthetic method, which offers a green and sustainable water remediation technology.

关键词: Oil palm frond biomass, N-doped carbon quantum dots, Titanium-dioxide, In-situ hydrothermal, Visible light photocatalysis, Methylene blue

Zeng Wei Heng, Woon Chan Chong, Yean Ling Pang, Lan Ching Sim, Chai Hoon Koo. Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation[J]. Chinese Journal of Chemical Engineering, 2022, 51(11): 21-34.

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Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

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