Visible-light driven dual heterojunction formed between g-C3N4/BiOCl@MXene-Ti3C2 for the effective degradation of tetracycline.

In the present study, we have successfully formulated a dual heterojunction of g-C 3 N 4 /BiOCl@MXene-Ti 3 C 2 (GCBM) which was found to be highly active in the visible region. GCBM was found to be highly efficient for the degradation of an antibiotic, tetracycline (TC) as compared to the individual constituting units; g-C 3 N 4 and BiOCl. Maximum of 97% TC degradation rate was obtained within 90 min of visible light irradiation for initial concentration of 10 mg/L of TC. Optical analysis exhibited that the synthesized heterojunction showed high absorption in the complete spectrum. The reactive species specified by the scavenger study showed the major involvement of ^• O 2 ⁻ and ^• OH radicals. The charge transfer mechanism showed that 2 schemes were majorly involvement in which Z-scheme was formed between g-C 3 N 4 and BiOCl and Schottky junction was formed between g-C 3 N 4 and Mxene-Ti 3 C 2. The formation of Schottky junction helped in inhibiting the back transfer of photogenerated charges and thus, helped in reducing the recombination rate. The synthesized photocatalyst was found to be highly reusable and was studied for consecutive 5 cycles that generalized the high proficiency even after repetitive cycles. [Display omitted] • Visible-light active heterojunction g-C 3 N 4 /BiOCl@MXene-Ti 3 C 2 GCBM) was designed. • Z-scheme and Schottky junction was used for explaining the charge transfer. • MXene-Ti 3 C 2 reduced the chances of back reactions. • O 2 ⁻ and OH radicals were found to be the major reactive species. [ABSTRACT FROM AUTHOR]