Biomimetic synthesis of Ag3PO4-NPs/Cu-NWs with visible-light-enhanced photocatalytic activity for degradation of the antibiotic ciprofloxacin
Biomimetic synthesis of Ag3PO4-NPs/Cu-NWs with visible-light-enhanced photocatalytic activity for degradation of the antibiotic ciprofloxacin
复制标题
仿生合成具有可见光增强光催化活性的Ag3PO4-NPs/Cu-NWs，用于降解抗生素环丙沙星
DOI：
10.1039/c6dt04656h
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发表时间：
2017-05-21
影响因子：
4
通讯作者：
Zhao, Yaping
中科院分区：
文献类型：
--
作者：
Liu, Yuling;Wu, Qingsheng;Zhao, Yaping
通过仿生合成的方法构建了一维Ag 3 PO 4-NPs/Cu-NW复合材料，并将其用于可见光催化。采用水热法合成了铜纳米线。在仿生合成过程中，PTFE多孔膜模拟细胞膜的传输过程，在控制银离子（Ag+）的传输速度，降低反应速度方面起着重要作用。因此，可以同时实现Ag+/Cu的置换反应的抑制和直径约为10 nm的Ag 3 PO 4纳米颗粒（NPs）在Cu-NW上的均匀生长。Ag_3PO_4-NPs/Cu-NW的粒径约为70 nm。由于单晶Cu-NW的高电子输运性，Ag 3 PO 4中的自由电子被转移出去以促进光生电子-空穴对分离。Ag 3 PO 4-NPs/Cu-NW的Ag 3 PO 4 NPs的稳定性得到改善，并且不再发生光分解。同时，Ag 3 PO 4的带隙减小到2.07 eV，扩大了可见光的吸收范围。此外，活性物种捕获实验表明，空穴和O-2（-）在光催化反应中起着重要作用。首次将Ag 3 PO 4-NPs/Cu-NWs用于环丙沙星（CPFX）的降解，显示出良好的光催化降解性能。可见光照射15 min后，Ag 3 PO 4纳米粒子和AC（0.3）催化剂对CPFX的降解率分别为27%和53%。最终，Ag 3 PO 4-NPs/Cu-NW的降解效率是纯Ag 3 PO 4 NPs的6.07倍。
1D Ag3PO4-NPs/Cu-NWs have been constructed to enhance visible-light-driven photocatalytic activity via biomimetic synthesis. Cu nanowires (NWs) were synthesized by a facile hydrothermal method. During the process of biomimetic synthesis, the porous PTFE film, which can mimic the transport process of cell membranes, plays an important role in controlling the transport speed of silver ions (Ag+) to decrease the reaction speed. Thus inhibition of the replacement reaction of Ag+/Cu and the uniform growth of Ag3PO4 nanoparticles (NPs) with a diameter of about 10 nm on Cu-NWs can be realized simultaneously. The diameter of Ag3PO4-NPs/Cu-NW is about 70 nm. Owing to the high electron transport of single crystal Cu-NWs, the free electrons in Ag3PO4 are transferred out to promote photogenerated electron-hole pair separation. The stability of Ag3PO4 NPs of the Ag3PO4-NPs/Cu-NWs was improved and the photodecomposition no longer occurred. Meanwhile, the band-gap of Ag3PO4 decreased to 2.07 eV after being coated on Cu-NWs and expanded the absorption scope of visible-light. In addition, the active species-trapping experiments indicated that the holes and O-2(-) play important roles in the photocatalytic reactions. The novel Ag3PO4-NPs/Cu-NWs were used for the degradation of ciprofloxacin (CPFX) for the first time and showed high photocatalytic degradation performance. After visible-light irradiation for 15 min, the degradation rates of CPFX with pure Ag3PO4 NPs and AC(0.3) as catalysts were about 27% and 53%. In the end, the degradation efficiency of Ag3PO4-NPs/Cu-NWs was 6.07 times that of the pure Ag3PO4 NPs.