Combustion Synthesis Of Alumina-Based Nanomaterials And Their Visible Light Photocatalytic Activity

With the continuous and fast development of our country's economy and the increasing industrialization and urbanization,the environmental pollution is becoming more and more serious.Compared with the traditional treatment methods for organic pollutants,photocatalytic oxidation is a kind of green technology,and has a wide application prospect because of its low cost,environmental friendly,and sustainable use.At present,the most of photocatalysts are of ultraviolet activity,and need complicated preparationmethodsorcostlysyntheticprocedures.Hence,developing visible-light-driven photocatalysts with facile synthesis process,low cost and high activity has attracted a great deal of attention.Herein,a facile synthesis technique for hercynite via self-combustion of IL using diethylamine hydrochloride??C₂H₅?₂NH·HCl?and urea as co-fuels is presented.Fe?NO₃?₃.9H₂O is used as the source of iron ion without taking expensive compounds containing Fe?II?.The as-prepared FeAl₂O₄ exhibits a mesoporous structure with high specific surface area,as well as visible-light photocatalytic ability for the first time.The as-prepared samples were characterized by XRD,BET,TEM,SEM,DRS.The results show that the combustion-prepared samples exhibit good photo-absorption abilities to visible light.When the molar ratio of diethylamine hydrochloride to ferric nitrate is 0.4:1,The obtained FeAl₂O₄ sample exhibits the highest photocatalytic activity.Based on the active transfer role of amorphous Al₂O₃,Al₂O₃/BiOBr heterojunction materials have been developed via in-situ solution combustion method.The effects of the reaction conditions such as molar ratio of Bi and Al and the reaction time on the photocatalytic ability of Al2O3/BiOBr nanocomposites under visible light irradiation were also discussed.The removal of 50 mg/L RhB can reach 91%in 60 min under visible light irradiation,and the pseudo-first-order rate constant is 0.0365 min^-1.