Despite the development of advanced photocatalysts, the practical application of photocatalytic water disinfection is still under restrictions due to the low reusability of powder photocatalysts. In this paper, we synthesized the binary composite heterojunction photocatalyst MoS₂/TiO₂ nanotube arrays (MoS₂/TiO₂ NTAs), using anodic oxidation method and hydrothermal method. The water disinfection efficiency of MoS₂/TiO₂ NTAs under visible light irradiation against pathogenic bacteria was up to 98.5% and still reached 92.1% after 3 times recovering and recycling. The mechanism was proven to be the seriously damage of bacterial cell membrane caused by the ROS produced from MoS₂/TiO₂ NTAs photocatalyst under light irradiation. In addition, we analyzed the water sample changes after material recovery by ICP-MS, and found that there is no MoS₂ nanosheet falling off. This result supported the recyclable effect of MoS₂/TiO₂ NTAs and avoided the nanoparticles remaining in the water as much as possible. Therefore, MoS₂/TiO₂ NTAs composites have great application prospects in water disinfection due to their excellent photocatalytic disinfection effect, recyclability and reusability.

尽管发展了先进的光催化剂，但是由于粉末光催化剂的低可再利用性，光催化水消毒的实际应用仍然受到限制。本文采用阳极氧化法和水热法合成了二元复合异质结光催化剂MoS ₂ / TiO ₂纳米管阵列（MoS ₂ / TiO ₂ NTAs）。MoS ₂ / TiO ₂ NTAs在可见光照射下对病原菌的水消毒效率高达98.5％，经过3次回收再利用后仍达到92.1％。事实证明该机制是由MoS产生的ROS引起的细菌细胞膜严重受损光照射下的₂ / TiO ₂ NTAs光催化剂。此外，我们通过ICP-MS分析了材料回收后的水样变化，发现没有MoS ₂纳米片脱落。该结果支持了MoS ₂ / TiO ₂ NTAs的可回收利用效果，并尽可能避免了纳米颗粒残留在水中。因此，MoS ₂ / TiO ₂ NTAs复合材料具有优异的光催化消毒效果，可回收性和可重复利用性，在水消毒中具有广阔的应用前景。