In this study, a lateral heterostructures material (LCCN) of carbon quantum dot (CQDs) and carbon nitride (CN) was designed via the thermal polymerization of freeze-dried precursor. The special lateral heterostructures (LHSs) increased the bond length of O–O to fleetly active dissolved oxygen (DO), which exhibits 14-fold increased for tetracycline (TC) visible-light degradation compared to CN. In addition, the electrons of activated DO came from both TC and LCCN, which trapped the oxygen to generate multitudinous superoxide radical (•O₂^–), while the hole (h⁺) showed a negligible role in photocatalytic system. A rapid electron transfer channel was speculated between TC and photocatalyst by experiments and density functional theory. Furthermore, DFT and LC/MS predicted four degradation pathways of TC with the Fukui index (f⁰), and LCCN exhibited a favorable hinder on various environmental interferences. This work presented a novel perspective for the relationship of pollutant and material in photocatalysis.

在这项研究中，通过冷冻干燥前驱体的热聚合设计了碳量子点 (CQDs) 和氮化碳 (CN) 的横向异质结构材料 (LCCN)。特殊的横向异质结构 (LHS) 增加了 O-O 与快速活性溶解氧 (DO) 的键长，与 CN 相比，四环素 (TC) 可见光降解增加了 14 倍。此外，活化的 DO 的电子来自 TC 和 LCCN，它们捕获氧以生成大量超氧自由基 (•O ₂ ^– )，而空穴 (h ⁺) 在光催化体系中的作用可以忽略不计。通过实验和密度泛函理论推测了TC和光催化剂之间的快速电子转移通道。此外，DFT 和 LC/MS 用福井指数 (f ⁰ )预测了 TC 的四种降解途径，并且 LCCN 对各种环境干扰表现出有利的阻碍。这项工作为光催化中污染物与材料的关系提供了新的视角。