Synthesis of tungsten oxide/ amino-functionalized sugarcane bagasse derived-carbon quantum dots (WO3/N-CQDs) composites for methylene blue removal

Nugraha, M.W. and Zainal Abidin, N.H. and Supandi and Sambudi, N.S. (2021) Synthesis of tungsten oxide/ amino-functionalized sugarcane bagasse derived-carbon quantum dots (WO3/N-CQDs) composites for methylene blue removal. Chemosphere, 277. ISSN 00456535

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Abstract

In this present study, the tungsten oxide/amino-functionalized sugarcane bagasse derived-carbon quantum dots (WO3/N-CQDs) composite has successfully been prepared through a simple mixing process. The WO3 was synthesized through a precipitation method, and CQDs were amino-functionalized using ethylenedinitrilotetraacetic acid (EDTA) and ethylenediamine (EDA) through one-pot hydrothermal method. It is revealed that N-CQDs incorporation into WO3 alters the bandgap energy, crystallinity, surface area, and photoluminescence (PL) properties. The produced composites exhibit higher monoclinic WO3 crystallinity, larger surface area, lower bandgap energy and quenched photoluminescence intensity. The as-prepared WO3/N-CQDs composites exhibit better adsorption and photocatalytic degradation performance of methylene blue (MB) than the pristine WO3. It shows that the combination of N-CQDs and WO3 enhanced visible light absorption, by lowering the bandgap energy of WO3 from 2.175 to 1.495 eV. The best performance composite is WO3/N-CQDs EDA 2.5 with an efficiency of 96.86, removal rate constant of 0.02017/min, and chemical oxidation demand (COD) removal efficiency achieved 84.61. Moreover, the WO3/N-CQDs EDA 2.5 shows a significant photocatalytic activity even at higher MB initial concentration with 92.93 removal for 50 ppm MB. Subsequently, the composite also has good stability after a sequential 3-times cycle of degradation with 86.85 removal. The increasing photocatalytic performance is affected by the quenching effect of PL and lower bandgap energy. The lower intensity of the PL indicates the reduced charge carrier recombination resulting in increased photocatalytic activity. The combination of N-CQDs and WO3 resulted in improved photodegradation, which shows its significant potential to be utilized for wastewater treatment. © 2021 Elsevier Ltd

Item Type: Article
Additional Information: cited By 25
Uncontrolled Keywords: Aromatic compounds; Carbon; Chemical oxygen demand; Crystallinity; Energy gap; Light absorption; Nanocrystals; Photocatalytic activity; Photoluminescence; Precipitation (chemical); Rate constants; Titanium dioxide; Wastewater treatment, Amino-functionalized; Band gap energy; Carbon quantum dots; Derived carbons; Ethylene diamine; Functionalized; Methylene Blue; Methylene blue degradations; Sugar-cane bagasse; Tungsten oxide, Tungsten compounds, bagasse; carbon; edetic acid; ethylenediamine; methylene blue; oxide; quantum dot; tungsten; bagasse; carbon; cellulose; methylene blue; oxide; tungsten; tungsten oxide, adsorption; amino acid; biogenic mineral; composite; concentration (composition); crystallinity; degradation; dye; mixing; oxide group; performance assessment; photochemistry; quantum mechanics; wastewater treatment, adsorption; Article; concentration (parameter); crystallization; light absorption; nonhuman; photocatalysis; photodegradation; photoluminescence; precipitation; rate constant; sugarcane; surface area; synthesis; catalysis, Carbon; Catalysis; Cellulose; Methylene Blue; Oxides; Quantum Dots; Saccharum; Tungsten
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 10 Nov 2023 03:29
Last Modified: 10 Nov 2023 03:29
URI: https://khub.utp.edu.my/scholars/id/eprint/14657

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