Kinetics and mechanism of sunlight-driven rod-shaped Cu-metal organic framework catalyst with carboxylate double linker for reduction of Cr(VI) and rhodamine B dye degradation

Abstract

This study presents a novel rod-shaped copper-based metal organic framework containing carboxylate-based double linkers. The robust coordination between the metal centers and the carboxylate groups fortifies the framework, making it more resistant to thermal and chemical stresses. This enhanced stability plays a crucial role in improving the photocatalytic performance. It has remarkable catalytic efficacy in reduction in toxic chromium hexavalent and degradation in the poisonous dye rhodamine B under natural sunlight. The experimental findings demonstrated a noteworthy conversion of chromium(VI) to chromium(III) through an effective reduction of 83.40% after 70 min and the organic dye rhodamine B is degraded into its mineral component by 98.73% after 60 min. The obtained results highlight the critical role of the copper-metal organic framework in generating reactive oxygen species under sunlight, showcasing its potential for addressing pressing water pollution challenges. Its unique rod-shaped morphology enhances active site exposure and facilitates efficient electron transfer, making it a highly effective material for environmental remediation. This sustainable approach underscores the promise of advanced metal–organic frameworks in delivering impactful solutions for water detoxification and pollution control.