High-Performance Type-II MIL/BiVO₄ Heterojunction: A Robust Photocatalyst for Efficient Cr(VI) Detoxification

Abstract

To address the issues of low efficiency and complex processes in traditional chromium pollution control technologies, the MIL/BiVO₄ heterojunction composite photocatalysts were constructed via hydrothermal in situ growth. This structure effectively promotes the separation of photo-generated charges, achieving complementary advantages between the two components, thereby significantly enhancing the photocatalytic reduction activity and efficiency of Cr(VI). The MIL/BiVO₄ heterojunction achieved a reduction rate of nearly 100% for hexavalent chromium within 15 minutes under the optimized conditions (UV irradiation, 15 mg of catalyst, 2 mM hexavalent chromium, and 0.7 mL of formic acid). After five cycles of reuse, the material retains over 95% of its catalytic activity, demonstrating excellent stability and reusability. This study provides new insights for developing highly efficient and sustainable materials for heavy metal pollution remediation.