Title : Solar-powered rod-shaped Cu-MOF photocatalyst with carboxylate double linkers for efficient Cr(VI) reduction and rhodamine B degradation
Abstract:
This study introduces an innovative rod-shaped copper-based metal-organic framework (Cu-MOF) synthesized using carboxylate-based double linkers, designed to address the persistent challenges of water pollution through dual photocatalytic action. The robust coordination between the copper centers and the carboxylate functional groups fortifies the structural integrity of the framework, rendering it highly resistant to thermal and chemical degradation. This exceptional stability not only prolongs the material’s lifespan but also significantly enhances its photocatalytic efficiency under natural sunlight. The Cu-MOF exhibits remarkable performance in the simultaneous reduction of hexavalent chromium (Cr(VI))—a highly toxic and carcinogenic heavy metal—and the degradation of the hazardous organic dye Rhodamine B, widely used in textile and industrial processes. Experimental investigations revealed an efficient photoreduction of Cr(VI) to the less toxic trivalent chromium (Cr(III)) with a conversion efficiency of 83.40% in just 70 minutes. Concurrently, the material achieved a substantial photodegradation of Rhodamine B, breaking it down into mineralized, non-toxic end products with a degradation efficiency of 98.73% within 60 minutes. The outstanding catalytic activity is attributed to the unique rod-like morphology of the Cu-MOF, which maximizes the exposure of active sites and promotes efficient light harvesting and electron transfer. These features collectively facilitate the generation of reactive oxygen species (ROS) such as hydroxyl and superoxide radicals under sunlight, which play a pivotal role in the oxidative degradation of pollutants. This study not only underscores the potential of structurally engineered Cu-MOFs for environmental remediation but also highlights a sustainable, sunlight-driven approach to detoxify water bodies contaminated with heavy metals and dyes. The work contributes significantly to the growing field of MOF-based photocatalysts, offering a practical, cost-effective solution for addressing real-world water pollution challenges.
