CeO₂/Al₂O₃ Heterojunction Synthesis And Activated Persulfate Degradation Of Antibiotic Wastewater

With the development of society,antibiotics play an important role in the treatment of human diseases.But the overuse of antibiotics has destroyed the balance of aquatic ecosystem and threatened human health.Water pollution treatment has become an urgent problem to be solved.Advanced persulfate oxidation techniques can produce reduction potential sulfate radical（·SO₄^-）and selectively oxidize electron-rich singlet oxygen（¹O₂）under the action of an external energy or catalyst,it is expected to be used for the degradation of high concentration wastewater.Firstly,Oxygen-rich vacancy CeO₂ was prepared by ionic liquid self-combustion,and the effect of PMS on HTC degradation was investigated.When PMS was not added,HTC was degraded mainly by ¹O₂ and·O₂^-free Radical,and when PMS was added,the main active species was ¹O₂.The mechanism of photocatalytic degradation of HTC by Vis/CeO₂/PMS was described through a series of characterization.Secondly,due to the low activity of amorphous Al₂O₃ and the high price of CeO₂,CeO₂/amorphous Al₂O₃ heterojunction nanomaterials were prepared to further improve the photocatalytic activity of visible light and reduce the amount of cerium used.The amount of photocatalytic active species was investigated by trap experiment and liquid ESR test,and the possible degradation mechanism was proposed.The photocatalytic performance of CeO₂/amorphous Al₂O₃ heterojunction/PMS system was studied by adjusting the amount of PMS,p H and ionic variables.It can be seen from the cyclic experiment that the catalyst shows excellent stability and repeatability.