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Green synthesized carbon quantum dots as TiO2 sensitizers for photocatalytic hydrogen evolution
Scopus
Toplam 129 atıf DOI
Carbon quantum dots (CQDs) have attracted growing interest due to their superior luminescent properties, which make them excellent photosensitizers for TiO2. This study presents the green-synthesis of CQDs from edible mushroom Agaricus bisporus through microwave irradiation. In the study as-synthesized CQDs were used as a sensitizer for TiO2 in photocatalytic hydrogen evolution in aqueous triethanolamine (sacrificial reagent) under visible-light irradiation. Photocatalytic hydrogen production activity of CQD-sensitized TiO2 was found to be 472 μmol g−1 h−1 (without loading any noble metal co-catalyst) and 1458 μmol g−1 h−1 (with loading Pt co-catalyst). The study revealed that the CQDs from mushroom A. bisporus can be used as an efficient sensitizer for TiO2 in photocatalytic hydrogen production.
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Photocatalytic hydrogen evolution of carbon quantum dots-modified TiO2 achieved by green synthesis
Scopus
Havuzumuzda 5 atıf almış
Carbon quantum dots (C-dots) play an integral part in various photocatalytic systems due to their low toxicity, high photoluminescence, small size, conductivity, and light-emission properties. In this study, C-dots acting as effective sensitizers were synthesized via a green route using Aspergillus sp. mold as the carbon source and, for the first time, integrated with TiO₂ to construct a composite system for photocatalytic hydrogen evolution (PHE). The PHE activity of the C-dots-sensitized TiO₂ was measured at 1.9 mmol g⁻¹ h⁻¹, which increased to 2.6 mmol g⁻¹ h⁻¹ with the addition of a Pt co-catalyst. Herein, C-dots served as sensitizers on TiO2 to increase the visible light absorption, and the enhanced PHE performance is attributed to synergistic interaction between the C-dots and TiO₂, which not only broadens the light absorption range but also facilitates more efficient charge transport. Consequently, C-dots enhance the effectiveness of TiO₂, enabling it to perform more efficiently in photocatalytic reactions, particularly hydrogen evolution systems.