Various research groups have been paying huge attention to tune the metal states in metal–carbon hybrid materials. Herein, a mixed-valence copper-iodine co-doped carbon dots (Cu,I-CDs, Cu²⁺/Cu⁺/Cu⁰) were prepared through a one-step hydrothermal method, which displayed an intrinsic reduction performance under given conditions. Moreover, AuNPs/Cu,I-CDs composite was fabricated using Cu,I-CDs as reductant and stabilizer. Among them, the AuNPs/Cu,I-CDs composite exhibited the highest oxidase- and peroxidase-like activities, which was used for the colorimetric detection of tert-butyl hydroquinone (TBHQ), with the detection limits of 23.45 μg/kg. Interestingly, the catalytic oxidation of TBHQ to oxidized TBHQ (TQ) could be inhibited by formaldehyde (HCHO). Therefore, a colorimetric sensor for HCHO was developed with the detection limit 0.335 mg/L. The catalytic mechanism for TBHQ was investigated by employing scavengers of different reactive species, indicating the significant roles of •O₂⁻ in the catalytic process. Therefore, it is believed that the as-prepared AuNPs/Cu,I-CDs nanozyme has promising potential applications in the fields of biomedicine and food safety.

各种研究小组一直非常关注调整金属-碳杂化材料中的金属状态。在此，通过一步水热法制备了混合价铜碘共掺杂碳点（Cu，I-CDs，Cu ²⁺ /Cu ⁺ /Cu ⁰），在给定条件下表现出固有的还原性能. 此外，使用Cu,I-CDs作为还原剂和稳定剂制备了AuNPs/Cu,I-CDs复合材料。其中，AuNPs/Cu,I-CDs 复合物表现出最高的氧化酶和过氧化物酶活性，用于比色检测叔-丁基氢醌（TBHQ），检测限为23.45 μg/kg。有趣的是，甲醛 (HCHO) 可以抑制 TBHQ 催化氧化为氧化 TBHQ (TQ)。因此，开发了检测限为 0.335 mg/L 的 HCHO 比色传感器。通过使用不同活性物种的清除剂研究了 TBHQ 的催化机制，表明 •O ₂ ^-在催化过程中的重要作用。因此，所制备的AuNPs/Cu,I-CDs纳米酶在生物医学和食品安全领域具有广阔的应用前景。