Abstract：
In this work, a Z-scheme heterostructured BiOCOOH/O-gC3N4 material was synthesized and immobilized on chitosan (CTS) to obtain the BiOCOOH/O-gC3N4/CTS photocatalytic material for photocatalytic degradation of oxytetracycline hydrochloride (CTC).Our findings indicate that the composite material BiOCOOH/O-gC3N4, as well as the BiOCOOH/O-gC3N4/CTS composite membrane, displayed a significantly higher efficiency in photocatalytic degradation of CTC compared to BiOCOOH alone, owing to the synergistic effect of adsorption and photocatalysis. Following four cycles of use, the composite material retained around 96 % of its initial photocatalytic degradation activity. The addition of CTS in the photocatalytic material resolved issues such as aggregation and difficult recovery commonly encountered with powder materials, thereby facilitating effective collision between the photocatalytic active sites and CTC. Experimental and theoretical calculations provided confirmation that the combination of BiOCOOH and O-gC3N4 effectively enhanced the light absorption capacity and photocatalytic performance. Furthermore, we investigated the influence of environmental factors such as pH value and anions on the photocatalytic degradation experiment, which offers valuable insights for the application of composite catalysts in wastewater treatment.
摘要：
在这项工作中,合成了一种Z型异质结构的BiOCOOH/O-gC3N4材料，并将其固定在壳聚糖（CTS）上，获得了用于光催化降解盐酸土霉素（CTC）的BiOCOOH/O-gC3N4/CTS光催化材料。我们的研究结果表明，复合材料BiOCOOH/O-gC3N4，以及BiOCOOH/O-gC3N4/CTS复合膜，与单独使用BiOCOOH相比，CTC的光催化降解效率明显更高，由于吸附和光催化的协同作用。在四个使用周期之后，复合材料保留了其初始光催化降解活性的96％左右。在光催化材料中添加CTS解决了粉末材料通常遇到的聚集和难以回收等问题，从而促进光催化活性位点与CTC之间的有效碰撞。实验和理论计算证实了BiOCOOH和O-gC3N4的组合有效地提高了光吸收能力和光催化性能。此外，考察了pH值、阴离子等环境因素对光催化降解实验的影响,这为复合催化剂在废水处理中的应用提供了有价值的见解。
