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: The formation of a p-n heterojunction creates an internal electric field that drives electrons and holes in opposite directions, reducing recombination rates. This synergy leads to the production of reactive oxygen species (ROS) like hydroxyl radicals ( ) and superoxide radicals ( ), which Mineralize the organic dyes. 4. Conclusion 124272

: The cotton floc-like structure provides a high surface area, which maximizes the contact between the catalyst and pollutants. Below is a summary structured like a full

Traditional photocatalysts like TiO₂ often suffer from a wide bandgap, limiting their efficiency to the ultraviolet spectrum. Heterojunction engineering—coupling two semiconductors with staggered band alignments—is a proven strategy to extend light response into the visible range. This paper focuses on the system. ZnO provides a robust, non-toxic framework, while BiOI, a p-type semiconductor with a narrow bandgap, serves as a visible-light sensitizer. 2. Materials and Methods recovery and degradation mechanism

The number most likely refers to the scientific article "One-step synthesis of highly active cotton floc like ZnO–BiOI: Visible-light photocatalytic performance, recovery and degradation mechanism," published in the Journal of Solid State Chemistry , Volume 327 (2023).

The study successfully demonstrates a facile route to highly active ZnO–BiOI photocatalysts. The material’s high degradation efficiency and excellent recovery/reusability make it a promising candidate for practical industrial wastewater treatment.

Environmental pollution from organic dyes in wastewater remains a critical global challenge. This study presents a novel of a "cotton floc-like" ZnO–BiOI hybrid material. By combining zinc oxide (ZnO) and bismuth oxyiodide (BiOI), we developed a heterostructure that significantly enhances photocatalytic activity under visible light . The unique morphology improves light absorption and facilitates the separation of photo-generated charge carriers. Our findings demonstrate rapid degradation of organic pollutants, high stability, and ease of recovery from aqueous solutions. 1. Introduction