ORIGINAL ABSTRACT

For wastewater remediation, efficiently avoiding harmful co-product formation while achieving carbon source recovery remains a challenge worthy of attention. Herein, we deliberately bridge a polar pyridinic moiety into carbon nitride (PDCN) to construct a lattice distortion structure with interfacial charge asymmetric polarization, achieving complete photodegradation of glyphosate (Gly) wastewater into sarcosine (>99% selectivity) and CO (1166.2 µmol g-1 h-1) within a short timeframe. The introduction of polar pyridine not only causes the C─N─C bond angle of PDCN to distort, generating a local polarization field, but also induces a dipole field, which achieves effective separation and directional transfer of photogenerated carriers, respectively. This directed electron localization enhances O2 adsorption by PDCN's electron-rich pyridine regions and its conversion into reactive •OH for cleaving C─P bonds. Furthermore, PDCN's electron-deficient heptazine region activates Gly's α-C─H bond via electrostatic interactions with phosphate groups, promoting the selective cleavage of C─P bonds in Gly and avoiding the formation of toxic aminomethylphosphonic acid. Glycine and other co-products show no significant impact on the growth of organisms like fathead minnows and mung beans. This work establishes a viable perspective for efficient wastewater purification and carbon recovery enabled by the synergistic interaction of localized polarization and dipole fields.