Ag-Ti^(3+)-TiO_(2)纳米锥的制备及光电催化性能研究

Preparation and photo-electrocatalytic performance of Ag-Ti^(3+)-TiO_(2) nanocone

抗生素的过度使用对环境造成了持久性的污染,光电催化是降解抗生素的环保、高效技术,其中光电极的设计尤为重要。为提高抗生素降解速率,采用电化学还原和光还原法制备了Ag-Ti^(3+)-TiO_(2)纳米锥复合光电极,并用于模拟可见光照射下光电催化降解四环素的过程,考察其光电催化性能。结果表明,由于Ti^(3+)自掺杂和Ag纳米颗粒的局域表面等离子体共振效应,复合电极有效地抑制了光生电子-空穴对的复合,并表现出更低的电荷转移电阻,提高了光电催化性能。复合光电极在可见光照射下,90 min后可降解87.9%的四环素,且5个循环后降解率保持在82.5%。这些结果表明,Ag-Ti^(3+)-TiO_(2)纳米锥复合光电极具有高降解效率、良好的稳定性和可持续的循环利用性,有望实现高效环保地光电催化降解抗生素。

The overuse of antibiotics has caused persistent pollution to the environment,and photo-electrocatalysis is an environmentally friendly and efficient technology for degrading antibiotics,in which the design of photoelectrodes is particularly important.To improve the rate of antibiotic degradation,Ag-Ti^(3+)-TiO_(2) nanocone composite photoelectrode was prepared by electrochemical reduction and photoreduction methods.Then it was used to simulate the photo-electrocatalytic degradation of tetracycline under visible light irradiation to investigate its photocatalytic performance.The results showed that the composite electrode effectively suppressed the complexation of photogenerated electron-hole pairs and exhibited a lower charge transfer resistance to improve the photo-electrocatalytic performance due to the Ti^(3+)self-doping and the local surface plasmon resonance effect of Ag nanoparticles.The composite photoelectrode degraded 87.9% of tetracycline after 90 min under visible light irradiation,and the degradation rate was maintained at 82.5% after 5 cycles.These results indicated that the Ag-Ti^(3+)-TiO_(2) nanocone composite photoelectrode had high degradation efficiency,good stability and sustainable recyclability,and was expected to achieve efficient and environmentally friendly photo-electrocatalytic degradation of antibiotics.