Preparation And Photocatalytic Properties Of Low-dimensional Tellurium Nanomaterials

Low-dimensional tellurium nanomaterials have special optical properties,specific surface area and high reactivity,which make them one of the ideal materials in various fields of optical applications.The photocatalytic degradation process uses renewable solar energy as the energy source,which has the advantages of mild reaction conditions,low cost,high treatment efficiency and no secondary pollution.It is an effective method to treat toxic and biodegradable organic wastewater at present,and has great advantages.In this paper,tellurium nanomaterials with different sizes and morphologies were prepared by various methods using tellurium materials as precursors,and their performance in photocatalytic degradation of organic pollutants was studied.Specific research contents are as follows:1.One-dimensional tellurium nanowires（TeNWs）were synthesized by hydrothermal method using sodium tellurite（Na₂TeO₃）as raw material and characterized by various methods.Rhodamine B（Rh B）was used as the target dye to study the photocatalytic performance of TeNWs,and the effect of experimental conditions on the degradation rate of Rh B was explored.The results showed that the degradation rate of Rh B by TeNWs was about 95%within 60 min,and the catalytic performance and recycling ability were good.2.One-dimensional tellurium nanorods（TeNRs）were prepared by hydrothermal method using Na₂TeO₃ as tellurium source.TeNRs were characterized by various methods.The photocatalytic performance of TeNRs was studied by photocatalytic degradation of Rh B,and the experimental conditions of Rh B degradation were optimized.The experiments showed that TeNRs had a good degradation effect on Rh B,and the removal rate could reach about 96%within 60 min,and the reusability was good.3.Tellurium quantum dots（TeQDs）were prepared by ultrasound-assisted method using tellurium blocks as precursors.It was characterized by TEM and XRD.Rh B was selected to evaluate the photocatalytic performance of TeQDs,and the effect of experimental conditions on the degradation rate of Rh B was analyzed.The results showed that the degradation rate of Rh B by TeQDs was up to 96%within 30 min,and the photocatalytic performance was significantly better than that of TeNWs and TeNRs.The results of free radical capture experiment showed that·OH and·O₂^-played a major role in photocatalytic degradation.After four cycles of experiments,the photocatalytic degradation efficiency of TeQDs was still higher than 85%,which indicated that TeQDs was a good catalyst for photocatalytic degradation of organic dye Rh B.