S-Modified MXene as a Catalyst for Accelerated Tetracycline Hydrochloride Electrocatalytic Degradation via .OH and Active Chlorine Triggering Promotion

S-modified MXene (Ti3C2Tx@S-5) was prepared to improve the catalytic activity of MXene in the electrocatalytic degradation of tetracycline hydrochloride (TC). Here, S groups in the form of Ti-S and S-O species were anchored onto MXene, resulting in superior conductivity and surface activity. Ti3C2Tx@S-5 exhibited an excellent performance of 100% TC degradation under the conditions of 25 & DEG;C, a pH of 6, a TC concentration of 10 mg L-1, and an applied current of 20 mA. Radical quenching and EPR analyses revealed that & BULL;O2- and 1O2 played dominant roles in Ti3C2Tx@S-5 and Ti3C2Tx systems. Furthermore, S modification promoted the triggering of & BULL;OH and active chlorine, which contributed to the acceleration of TC degradation. The involvement of these active substances in degradation pathways was further proven. This research advances the S modification of MXene and improves TC degradation by promoting the triggering of & BULL;OH and active chlorine, broadening the applicability of MXene material.