The construction of efficient and multifunctional photocatalyst with tight hybridization structure is an ideal method to remove pollutants from wastewater. To achieve the goal, a novel n-p type 0D/2D SnO_2−x/BiOI photocatalyst was prepared by using large specific surface area SnO_2−x (203.1 m²/g) combining with BiOI nanosheet through a facile in situ growth route. A series of techniques including TEM, HRTEM and BET confirmed the structure of 0D/2D SnO_2−x/BiOI composite. As expected, the novel SnO_2−x/BiOI photocatalyst can successfully remove tetracycline (TC), Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) under LED light. Photocurrent and EIS verified the enhanced separation efficiency of photo-excited electron-hole pairs. Trapping experiment and mass spectrometry analysis revealed the active species, intermediate product and photodegradation pathway in photocatalytic process. The mechanism reveals that the Fermi levels of n-type SnO_2−x and p-type BiOI have reached a new equilibrium, which is conducive to charge separation of electrons and holes. This work provides an effective example for the preparation of compact heterojunction photocatalytic materials with high efficiency.

构建紧密杂交结构的高效多功能光催化剂是去除废水中污染物的理想方法。为了实现该目标，通过使用大的比表面积SnO _{2- x}（203.1 m ² / g）与BiOI纳米片结合，通过一种简便的原位生长途径，制备了一种新型的np型0D / 2D SnO _2-x / BiOI光催化剂。TEM，HRTEM和BET等一系列技术证实了0D / 2D SnO _2-x / BiOI复合材料的结构。不出所料，新型SnO _2-x / BiOI光催化剂可以成功去除四环素（TC），大肠杆菌（E. coli）和金黄色葡萄球菌（S. aureus））在LED灯下。光电流和EIS验证了光激发电子-空穴对的增强分离效率。诱捕实验和质谱分析揭示了光催化过程中的活性物种，中间产物和光降解途径。该机理表明，n型SnO _2-x和p型BiOI的费米能级达到了新的平衡，这有利于电子和空穴的电荷分离。这项工作为高效制备紧凑的异质结光催化材料提供了有效的实例。