PS协同Z型异质结2D/BiOI/g-C3N4 光催化降解四环素

以三聚氰胺为前驱体，采用简单的热聚合方法制备了超薄石墨相氮化碳（g-C3N4），并用原位沉积-沉淀法在g-C3N4表面生成碘氧化铋（BiOI），复合构筑不同BiOI质量占比的二维碘氧化铋/石墨相氮化碳（2D/BiOI/g-C3N4，BICN-x）Z型异质结用以协同过二硫酸盐（PS）。通过XRD、FTIR、SEM、HRTEM、BET、UV-vis DRS对光催化剂的结构、表面官能团、形貌特征、比表面积和光学性能进行表征分析。结果表明：BiOI与g-C3N4质量比为2∶1（BICN-3）时，通过密切的界面耦合，光生电子-空穴对分离效率较高，光生e-以更快的迁移速度到达结构表面，并且在LED照射60 min内，BICN-3与PS形成的催化体系（BICN-3/PS）去除了88.2%的四环素（TC，10mg/L），降解速率是单独BICN-3的3.82倍。

Photocatalytic degradation of TC by PS and Z-type heterojunction 2D/BiOI/ G-C3N4

Ultrathin graphitic phase carbon nitride (g-C3N4) was prepared by a simple thermal polymerization method using melamine as the precursor. The two-dimensional bismuth iodide/graphite phase carbon nitride (2D/BiOI/g-C3N4, BICN-x) Z-type heterojunction with different BiOI mass ratios were compounded and constructed by in situ deposition-precipitation method to generate bismuth iodide (BiOI) on the surface of g-C3N4 for synergistic persulfacte (PS). The structure, surface functional groups, morphological characteristics, specific surface area and optical properties of the photocatalysts were characterized by XRD, FTIR, SEM, HRTEM, BET and UV-vis DRS. The results showed that the photogenerated electron-hole pair separation efficiency was higher when the mass ratio of BiOI to g-C3N4 was 2:1 (BICN-3) through close interfacial coupling, the photogenerated e- reached the surface of the structure with a faster migration rate, and the catalytic system formed by BICN-3 and PS (BICN-3/PS) removed 88.2% of tetracycline (TC, 10 mg/L), with a degradation rate 3.82 times higher than that of BICN-3 alone.