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Light-gated specific oxidase-like activity of a self-assembled Pt(ii) nanozyme for environmental remediation

Kapila, R and Sen, B and Kamra, A and Chandran, S and Rana, S (2023) Light-gated specific oxidase-like activity of a self-assembled Pt(ii) nanozyme for environmental remediation. In: Nanoscale, 15 (36). pp. 14809-14821.

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Official URL: https://doi.org/10.1039/d3nr02081a


Artificial enzyme equivalents, also known as nanozymes, are a practical tool for environmental remediation when compared to their natural counterparts due to their high operational stability, efficiency, and cost-effectiveness. Specific oxidase mimicking nanozymes are well suited to degrade toxic chemicals from industrial waste such as phenols and azo dyes. Therefore, photocatalytic nanozymes using visible/sunlight would provide a viable strategy for sustainable environmental remediation. Herein, we introduce an aggregation-induced emissive Pt(ii) complex, which self-assembles in water providing NanoPtA nanotapes. These structures exhibit a specific oxidase-like nanozyme activity driven by light. The NanoPtA structure assists in the photogeneration of singlet oxygen in water via a triplet excited 3MMLCT state, leading to a specific oxidase-like activity instead of a peroxidase-like activity. The self-assembled nanozyme showed great stability under harsh environmental conditions and exhibited photo-induced specific oxidase-mimetic activity, which was considerably more efficient than the natural enzyme or other specific nanozymes. We demonstrated efficient NanoPtA-induced photocatalytic degradation of various phenolic compounds and azo dyes within 5-10 minutes of light irradiation. Notably, the system operates under sunlight and exhibits reusability over twenty cycles of catalytic reactions. Another fascinating aspect of NanoPtA is the unaltered catalytic performance for more than 75 days, providing a robust enzyme-equivalent for practical sustainable environmental remediation. © 2023 The Royal Society of Chemistry.

Item Type: Journal Article
Publication: Nanoscale
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to the Royal Society of Chemistry.
Keywords: Azo dyes; Biodegradation; Catalysis; Cost effectiveness; Enzymes; Excited states; Phenols; Platinum compounds; Sustainable development, Artificial enzymes; Azo-dyes; Environmental remediation; Nanotapes; Operational stability; Photo generation; Photo-catalytic; Pt complexes; Self-assemble; Toxic chemicals, Reusability
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 24 Nov 2023 10:57
Last Modified: 24 Nov 2023 10:57
URI: https://eprints.iisc.ac.in/id/eprint/83225

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