Full‐Spectrum Solar‐Driven Photothermal Strategy Based on Oxygen‐Vacancy‐Engineered NiOOH@H‐TiO ₂ for High‐Efficiency Sewage Remediation

Harnessing solar energy for pollutant removal remains constrained by limited light‐harvesting efficiency and insufficient interfacial compatibility between catalysts and organic contaminants. Here, we report a full‐spectrum photothermal catalytic platform based on commercial TiO 2 engineered with surface oxygen vacancies. The introduction of oxygen‐vacancy sites establishes a dynamic adsorption environment capable of binding key functional groups of organic pollutants while simultaneously converting TiO 2 into a broadband‐absorbing black derivative that exhibits pronounced photothermal response under near‐infrared irradiation. Incorporation of NiOOH further enhances charge generation and promotes the formation of reactive oxygen species (•OH and •O 2 − ), thereby accelerating photothermal oxidation pathways. The NiOOH@H‐TiO 2 enables rapid degradation of Rhodamine B (20 ppm), achieving >99% removal within 5 min, and maintains >98% efficiency over five consecutive cycles with negligible activity loss (<2%). These results demonstrate a generalizable approach for constructing full‐spectrum photothermal catalysts and offer new insights into solar‐driven water purification.