# Light‐Gated Thermal Domains in Nano‐Lanterns: Confined Heat Hotspots Sparks Electron Localization for Water Purification

## TL;DR

A new catalyst using confined heat improves water purification by efficiently activating peroxyacetic acid, leading to rapid pollutant degradation.

## Contribution

The development of 'light-gated thermal domains' in hollow porous carbon nanospheres enhances PAA activation efficiency.

## Key findings

- The HPCS+PAA system achieved over 98% degradation of sulfadiazine in 90 minutes.
- The reaction rate constant was 11 times higher than in non-confined systems.
- Heat confinement synergizes radical and non-radical pathways for efficient pollutant detoxification.

## Abstract

Peroxyacetic acid (PAA) oxidation technology receives widespread concerns for water purification with minimal secondary pollution. Conventional heat‐driven PAA activation generally wastes energy during solution heating. In this study, “light‐gated thermal domains” concept is developed in a hollow porous carbon nanosphere (HPCS), and the confined heat hotspots lead to a higher temperature (80 °C) in the internal space than in the solution (40 °C). This endows the HPCS with exceptional redox capacity, optical response, and electron transfer capability. The degradation efficiency of sulfadiazine in the HPCS+PAA catalytic system reached more than 98% within 90 min of irradiation, with a reaction rate constant 11 times higher than that in the non‐confined system. The “light‐gated thermal domains” induces electron localization and decreases PAA activation energy barriers. In contrast to the non‐confined system dominated by the radical oxidation pathway, heat‐confinement exhibits synergies between the radical and non‐radical pathways, enabling rapid pollutant degradation. Zebrafish embryo experiments validated the pollutant detoxification capabilities of this system. This “light‐gated thermal domains” ensures long‐lasting robustness of PAA activation and paves a novel way for the development of sustainable catalytic water purification technologies.

A pore heat‐confined hollow porous canbon nanosphere catalyst is synthesized, with superior photo‐induced heat/redox response, revolutionizing peroxyacetic acid (PAA) activation for sustainable water purification. It overcomes traditional thermal PAA oxidation's energy inefficiency, enabling rapid pollutant degradation with a rate constant 11 times higher than nonconfined system, underscoring its remarkable superiority and potential for practical applications.