In this study, cobalt-doped and biochar-cocatalyst bismuth oxychloride (Co(Ⅱ)-BiOCl@biochar) photocatalysts were hydrothermally synthesized for the photodegradation of p-nitrophenol (PNP) and characterized via a series of analytical techniques. Results indicated that the addition of Co²⁺ and biochar to BiOCl resulted in 99.4% degradation of PNP in 90 min under vacuum ultraviolet (VUV) illumination. It was found that 5% doping of Co²⁺ and 30% loading of biochar significantly enhanced the photocatalytic performance of the as-prepared catalysts. After five cycles, the obtained hybrid catalysts still exhibited a good stability. Although the structure of BiOCl was not changed by the modification, the growth face changed from (0 0 1) to (1 1 0), which led to the narrow band gap, wide wavelength of the light source, effective separation of e^-/h⁺ pairs, and high photocatalytic activity. The vast improvement was related to the formation of ·OH, h⁺, e⁻, ·O₂⁻, and e_aq⁻, which was confirmed by the radical-trapping experiments. Furthermore, a plausible mechanism for the photocatalysis of PNP over CO(Ⅱ)-BiOCl@biochar hybrid catalysts under VUV irradiation was also proposed.

本研究以水热法合成了钴掺杂的生物炭-助催化剂三氯氧化铋（Co（Ⅱ）-BiOCl @ biochar）光催化剂，并通过一系列分析技术对其进行了表征。结果表明，在BiOCl中加入Co ²⁺和生物碳在90分钟内在真空紫外线（VUV）照射下可导致PNP降解99.4％。发现5％的Co ²⁺掺杂和30％的生物炭载量显着增强了所制备催化剂的光催化性能。在五个循环之后，所获得的杂化催化剂仍然显示出良好的稳定性。尽管BiOCl的结构未因该修改而改变，但生长面从（0 0 1）变为（1 1 0），这导致了窄的带隙，所述光源的宽的波长，例如有效分离^- / H ⁺对，和高的光催化活性。广阔的改善是与地层的·OH，H ⁺，E ^-，·O2 ₂ ^- ，和e_水溶液^- ，这是由自由基捕获实验所证实。并提出了在VUV辐射下CO（Ⅱ）-BiOCl @ biochar杂化杂化催化剂上PNP光催化的合理机理。