π-π Stacked step-scheme PDI/g-C3N4/TiO2@Ti3C2 photocatalyst with enhanced visible photocatalytic degradation towards atrazine via peroxymonosulfate activation

In this study, a novel π-π stacked PDI/g-C 3 N 4 /TiO 2 @Ti 3 C 2 photocatalyst with step-scheme (S-scheme) heterojunction was constructed to boost the atrazine (ATZ) photocatalytic degradation by activating peroxymonosulfate (PMS). The π-π interaction in the PDI/g-C 3 N 4 induced the delocalization of the photoelectrons, therefore promoted their migration. Meanwhile, the intimate contact and the staggered band configurations between the PDI/g-C 3 N 4 and TiO 2 @Ti 3 C 2 results in the S-scheme heterojunction thus declined the recombination of photocarriers. The π-π interaction and S-scheme heterojunction synergistically promoted the ATZ removal rate to 75% within one hour and can be well-adapted in a variety of environments. It was found that 1 O 2 domain the photocatalysis, and the H 2 O 2 generated during the reaction may also be helpful for the process. The transformation of ATZ, intermediates, and three pathways during the process were also investigated via LC-MS. Moreover, the total organic carbon analysis shows that the mineralization of ATZ reached 46.08%.