Synthesis And Application In Photocatalytic Technology Of Lithium Doped Zinc Oxide Nanobelts Array Films

With the rapid development of modern industry, more and more types of organic compounds are released into the natural environment. Semiconductor photocatalytic degradation technology is environmentally friendly. Research shows that the semiconductor oxide has more advantages with respect to other photocatalyst. ZnO is one of the preferred for its easy-to-crystalline and morphology controllability. It can be synthesized through different growth mechanism, doping modification or other composite to have better photocatalytic degradation efficiency. In this paper valuable explorations have been carried out on the synthesis and application in photocatalytic technology of zinc oxide-based porous nanobelts array films. The main points could be summarized as follows:Li+doped ZnO porous nanobelts array films with high surface area have been successfully synthesized by simple hydrothermal method and the follow-up heat treatment. When it was used as photocatalyst, high photocatalytic efficiency was obtained. SEM, TEM, HRTEM and BET were used to investigate the morphology, structure and specific surface area of the samples. The results show that Li+was doped into the ZnO lattice and the Li+-ZnO nanobelts with uniform porous have stable structure. Using these Li+-ZnO nanobelts array films to degradation rhodamine B after UV irradiation, its degradation efficiency has improved compared with undoped ZnO. When adjusting the hydrothermal reaction time, shorten the length of the Li+-ZnO nanobelts to7-9μm, we found that its photocatalytic degradation efficiency was about2.5times compared with undoped ZnO.On the basis of above research, using a simple low-temperature chemical bath, we get CdS/ZnO and CdS/Li+-ZnO nanobelts array films by deposition CdS on the surface of ZnO and Li+-ZnO which hydrothermal reaction time were two hours. SEM, TEM, HRTEM and UV-vis were used to investigate the morphology, structure and light absorption intensity of the samples. UV-vis test reveal that CdS/ZnO light absorption intensity is significantly higher than that of CdS/Li+-ZnO. Using these samples to degradation rhodamine B, the results showed that their photocatalytic efficiency are higher with the increasing of CdS deposition time, and after UV irradiation for50min, about98.61%and50%of the RhB solution were degraded in term of CdS/ZnO and CdS/Li+-ZnO arrays, respectively. Above all these samples, their photocatalytic degradation efficiency were CdS/ZnO>Li+-ZnO> CdS/Li+-ZnO> ZnO.