The occurrence of antibiotics in the ambient environment has raised serious concerns. In this work, the kinetics and mechanism of photocatalytic degradation tetracycline (TC) was investigated using three-dimensional network structure perylene diimide supramolecular organic photocatalyst (3D-PDI). Under visible-light irradiation, 3D-PDI exhibited excellent degradation performance and stability for several tetracycline-based antibiotics (e.g., tetracycline; chlortetracycline; oxytetracycline.). The adsorption and degradation rate of TC by 3D-PDI were 8.21 and 12.7 times higher than that of bulk-PDI. The enhanced adsorption and degradation performance of TC by 3D-PDI were mainly due to the larger specific surface area and π-electron conjugation of 3D network supramolecular system. Superoxide radical (O₂⁻), hydrogen peroxide (H₂O₂) and hole (h⁺) the main reactive species (RSs) for TC degradation. Under the attack of photocatalytic RSs, TC undergoes hydroxylation, demethylation, aromatization, and ring-opening processes, and finally complete mineralization into CO₂ and H₂O. These results revealed that perylene diimide supramolecular photocatalyst may be efficiently applied for the remediation of tetracycline contaminated natural waters.

周围环境中抗生素的出现引起了人们的严重关注。在这项工作中，使用三维网络结构im二酰亚胺超分子有机光催化剂（3D-PDI）研究了光催化降解四环素（TC）的动力学和机理。在可见光照射下，3D-PDI对几种基于四环素的抗生素（例如四环素，金霉素，土霉素）表现出出色的降解性能和稳定性。3D-PDI对TC的吸附和降解速率分别是块状PDI的8.21和12.7倍。3D-PDI增强TC的吸附和降解性能主要是由于3D网络超分子系统的比表面积更大和π电子共轭。超氧自由基（O ₂^-），过氧化氢（H ₂ O ₂）和空穴（h ⁺）是TC降解的主要反应性物质（RSs）。下光催化RS的攻击，TC进行羟基化，脱甲基化，芳构化，和开环过程，最后完全矿化成CO ₂和H ₂ O.这些结果可知，二萘嵌苯二酰亚胺超分子光催化剂可以有效地应用于对四环素的补救受污染的天然水。