College of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China.
College of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China.
Chemosphere. 2023 Jan;311(Pt 1):137041. doi: 10.1016/j.chemosphere.2022.137041. Epub 2022 Oct 28.
Developing broad-spectrum light reactions, effective charge separation, and easily recoverable photocatalysts were considered cost-effective pollution remediation methods. The ZnFeO/BC/ZnO composite was prepared to achieve these objectives, where biochar (BC) was used as a conductive channel and ZnFeO as a magnetic substance. Among them, the 0.6-ZBO composite performed the best, with photocatalytic removal of tetracycline (TC) reaching 85.6%. The photocatalytic degradation rated constant of 0.6-ZBO composite was 23.36 × 10 min, which was 7.6, 4.1, and 2.5 times higher than that of ZnFeO/BC, ZnO, and ZnFeO/ZnO samples, respectively. According to several characterization data, it was demonstrated that successful Z-scheme heterojunctions were constructed between ZnFeO and ZnO. The 0.6-ZBO complex increased the range of light absorption and strengthened the separation of electron-hole pairs, thus improving the redox ability of the complex. In the different water matrices, the stability of 0.6-ZBO was excellent and its ability to remove TC decreased slightly to about 11% after 5 cycles. This work provided a valuable approach to design a novel and efficient system for degrading organic pollutants in wastewater using magnetic biochar.
开发广谱光反应、有效的电荷分离和易于回收的光催化剂被认为是具有成本效益的污染修复方法。为了实现这些目标，制备了 ZnFeO/BC/ZnO 复合材料，其中生物炭 (BC) 用作导电通道，ZnFeO 用作磁性物质。其中，0.6-ZBO 复合材料的性能最佳，四环素 (TC) 的光催化去除率达到 85.6%。0.6-ZBO 复合材料的光催化降解速率常数为 23.36×10 min，分别是 ZnFeO/BC、ZnO 和 ZnFeO/ZnO 样品的 7.6、4.1 和 2.5 倍。根据一些表征数据，证明了 ZnFeO 和 ZnO 之间成功构建了 Z 型异质结。0.6-ZBO 复合物增加了光吸收范围并加强了电子-空穴对的分离，从而提高了复合物的氧化还原能力。在不同的水基质中，0.6-ZBO 的稳定性非常好，经过 5 次循环后，其去除 TC 的能力仅略有下降，约为 11%。这项工作为设计一种新型高效的用于降解废水中有机污染物的磁性生物炭系统提供了有价值的方法。
