Bismuth oxyiodide (BiOI) features alternating [Bi2O2]2+ layers and double I− interlayers, which forms an intrinsic electric field that enhances charge carrier transfer and facilitates the efficient separation of photogenerated electron-hole pairs. Owing to its exceptional visible-light absorption capability and high photocatalytic activity, BiOI has emerged as a promising candidate for environmental remediation. Herein, BiOI microsphere photocatalysts were fabricated via a facile solvothermal me