Immobilization of Bi-based metal-organic framework on g-C3N4 for efficient photocatalytic removal of tetracycline

Abstract

The development of efficient photocatalysts for wastewater remediation has embarked increasing attention. In this work, Bi-based metal-organic framework (i.e., CAU-17) into was integrated into g-C3N4 matrix through a facile hydrothermal approach to fabricate CAU-17/g-C3N4composite photocatalysts. In particular, the composite exhibits a lily-like structure with a superior interface affinity between CAU-17 and g-C3N4. The introduction of CAU-17 results in a reduced charge transfer resistance and an enhanced photo-induced electron-hole separation rate. The hybrid CG-8 composite with a g-C3N4 loading of 8 wt% presented a Z-scheme heterostructure and the electron-hole pair recombination was effectively restricted. Photocatalytic removal of tetracycline was conducted and the kinetic constant of tetracycline degradation was improved 3.28 times in comparison of pristine CAU-17.