Asymmetric Atomic Pt-B Dual-Site Catalyst for Efficient Photoreforming of Waste Polylactic Acid Plastics in Seawater.
basic_science · Level V
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- Record sourced from PubMed, PMID 40247753.
- Also identified by DOI 10.1021/acsnano.5c02408.
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Abstract
Waste plastic has imposed significant burdens on marine ecosystems. Converting plastic into high-value products via photocatalysis is an emerging and promising approach, but its low activity and product selectivity pose great challenges. Herein, we report a carbon nitride-anchored atomically dispersed Pt-B dual-site catalyst (Pt SA/BCN100) for the photoreforming of polylactic acid (PLA) into high-value chemicals and H<sub>2</sub> in seawater. Experiments and DFT calculations reveal that significantly enhanced charge transfer occurs between the Pt site and the B site, and the hole-rich B site can selectively trigger the activation and cleavage of the C-H and C-C bonds of PLA to form acetic acid (AA), while the electron-rich Pt site drives the reduction of H protons to H<sub>2</sub>. As a result, Pt SA/BCN100 exhibits a high H<sub>2</sub> evolution rate of 993 μmol g<sub>catal</sub><sup>-1</sup> h<sup>-1</sup> and an AA production rate of 300 μmol g<sub>catal</sub><sup>-1</sup> h<sup>-1</sup> with a selectivity of over 98%. We also demonstrate the direct photoreforming of g-scale real-world PLA wastes and low concentrations of PLA microplastics in natural seawater. Techno-economic analysis and environmental assessment show that this catalytic system can significantly reduce carbon emissions and has potential commercial value.