A facile step-by-step synthetic route was developed to synthesize the three-dimensional (3D) BiOI/g-C3N4 heterojunction photocatalyst by loading BiOI nanosheets onto g-C3N4 microtubes. And adjusting the material ratio easily controlled the amount of BiOI nanosheets on BiOI/g-C3N4 photocatalyst (BiOI/CN-0.5, BiOI/CN-1, BiOI/CN-3 and BiOI/CN-7). The photocatalytic properties were investigated by degradations of tetracycline (TC) and p-chlorophenol (4-CP) with visible-light irradiation. Eminently, the BiOI/CN-1 photocatalyst exhibited the best performance with the degradation rate of 86.98% TC in 90 min (the degradation rate 68.95% 4-CP in 240 min), which was much higher than pure BiOI or g-C3N4 as photocatalyst. Moreover, the BiOI/CN-1 photocatalyst possessed high stability and could be reused without much decrease in photocatalytic activity after four recycles. The significant separation and transfer property of photogenerated charge carriers were identified by photocurrent and PL spectroscopy, which contributed to the excellent degradation character of BiOI/CN-1 photocatalyst. In addition, active species capture experiment showed that the h+, OH and O2− were active radicals in the degradation process. And then, the Z-scheme transfer process of photogenerated charges for promoting catalytic performance was unveiled.

中文翻译：

---

一种可见光驱动的 3D Z 型光催化剂，将 BiOI 纳米片加载到 g-C3N4 微管上，以有效降解四环素和对氯苯酚

开发了一种简便的分步合成路线，通过将 BiOI 纳米片加载到 g-C3N4 微管上来合成三维（3D）BiOI/g-C3N4 异质结光催化剂。并且调整材料比例很容易控制 BiOI/g-C3N4 光催化剂（BiOI/CN-0.5、BiOI/CN-1、BiOI/CN-3 和 BiOI/CN-7）上 BiOI 纳米片的数量。通过在可见光照射下降解四环素 (TC) 和对氯苯酚 (4-CP) 来研究光催化性能。值得注意的是，BiOI/CN-1 光催化剂表现出最佳性能，90 分钟内降解率为 86.98% TC（240 分钟内降解率为 68.95% 4-CP），远高于纯 BiOI 或 g-C3N4，如光触媒。而且，BiOI/CN-1 光催化剂具有高稳定性，可重复使用，四次循环后光催化活性没有太大降低。通过光电流和PL光谱鉴定了光生载流子的显着分离和转移特性，这有助于BiOI/CN-1光催化剂的优异降解特性。此外，活性物种捕获实验表明，h+、OH 和 O2- 是降解过程中的活性自由基。然后，揭示了促进催化性能的光生电荷的Z-scheme转移过程。活性物种捕获实验表明 h+、OH 和 O2- 是降解过程中的活性自由基。然后，揭示了促进催化性能的光生电荷的Z-scheme转移过程。活性物种捕获实验表明 h+、OH 和 O2- 是降解过程中的活性自由基。然后，揭示了促进催化性能的光生电荷的Z-scheme转移过程。