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Research Article

Plasmonic quantum dots modulated nano-mineral toward photothermal reduction of CO2 coupled with biomass conversion

Guangbiao Cao1,§Haoran Xing1,§Haoguan Gui1Chao Yao1Yinjuan Chen1( )Yongsheng Chen2( )Xiazhang Li1( )
National-local Joint Engineering Research Center of Biomass Refining and High-quality Utilization, Changzhou University, Changzhou 213164, China
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0373, USA

§ Guangbiao Cao and Haoran Xing contributed equally to this work.

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Plasmonic Bi quantum dots immobilized on phosphoric acid modified attapulgite nanorod enabled high photothermal catalytic reduction of CO2 coupled with oxidation of benzyl alcohol.

Abstract

Simultaneous conversion of CO2 and biomass into value-added chemicals through solar-driven catalysis holds tremendous importance for fostering a sustainable circular economy. Herein, plasmonic Bi quantum dots were immobilized on phosphoric acid modified attapulgite (P-ATP) nanorod using an in-situ reduction–deposition method, and were employed for photocatalytic reduction of CO2 coupled with oxidation of biomass-derived benzyl alcohol. Results revealed that Bi atoms successfully integrated into the basal structure of P-ATP, forming chemically coordinated Bi–O–Si bonds that served as efficient transportation channels for electrons. The incorporation of high-density monodispersed Bi quantum dots induced a surface plasmon resonance (SPR) effect, expanding the light absorption range into the near-infrared region. As a consequence, the photo-thermal transformation was significantly accelerated, leading to enhanced reaction kinetics. Notably, 50% Bi/P-ATP nanocomposite exhibited the highest plasmon-mediated photocatalytic CH4 generation (115.7 μmol·g−1·h−1) and CO generation (44.9 μmol·g−1·h−1), along with remarkable benzaldehyde generation rate of 79.5 μmol·g−1·h−1 in the photo-redox coupling system under solar light irradiation. The hydrogen protons released from the oxidation of benzyl alcohol facilitated the incorporation of more hydrogen protons into CO2 to form key CH3O intermediates. This work demonstrates the synergistic solar-driven valorization of CO2 and biomass using natural mineral based catalyst.

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Nano Research
Pages 5061-5072
Cite this article:
Cao G, Xing H, Gui H, et al. Plasmonic quantum dots modulated nano-mineral toward photothermal reduction of CO2 coupled with biomass conversion. Nano Research, 2024, 17(6): 5061-5072. https://doi.org/10.1007/s12274-024-6521-9
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Received: 30 November 2023
Revised: 12 January 2024
Accepted: 28 January 2024
Published: 04 March 2024
© Tsinghua University Press 2024
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