Preparation And Photocatalysis Application Of Artificial Cells With Nano-heterojunction As Core Materials

In this thesis,nanomaterials such as carbon spheres(CSs),Ni-Fe hydrotalcite(NiFe LDHs),antimony tin oxide(ATO),and bismuth tin oxide(BTO)were mainly synthesized by hydrothermal methods.Then through the ultrasonic assisted method,and then calcined to form LDO-HSs@ATO,LDO-HSs@BTO heterojunction nanocomposites with hollow sphere structure.Then use LDO-HSs@ATO and LDOHSs@BTO as the core materials,coat phospholipids on the outside to form liposomes,and insert carbon nanotubes into the lipid membrane to form a tertiary structure of artificial cell materials LDO-HSs@ATO@Liposome@CNTs.In this thesis,a series of characterization methods are used to analyze the phase of the core material and the artificial cell material,analyze how the dye molecules enter the liposome through the carbon nanotubes and adsorb to the material,and explore the mechanism of the photocatalytic degradation reaction.1.We loaded Ni-Fe LDHs on the surface of CSs by the ultrasonic-assisted method,and then loaded ATO on the surface of Ni-Fe LDHs in the same way.Then we remove the internal CSs by high-temperature calcination to form a hollow sphere structure LDO-HSs@ATO heterojunction nanocomposite.We used this material for the photocatalytic degradation of dyes.Compared with Ni-Fe LDHs,LDO-HSs and ATO,its photocatalytic degradation efficiency is significantly improved.This is mainly due to the memory effect of LDH.LDO-HSs is reduced to form a double type II heterojunction with ATO on the surface,resulting in the effective separation of photogenerated electron-hole pairs.2.We synthesized the hollow sphere structure LDO-HSs@BTO heterojunction nanocomposite with the same method in the first topic.This material was used for the photocatalytic degradation of antibiotics(tetracycline),and its degradation efficiency is significantly improved compared with Ni-Fe LDHs,LDO-HSs,and BTO.The conditions of photocatalytic degradation of tetracycline were optimized by the controlled variable method.And through a series of characterizations,the heterojunction type is proved to be double II type.Similarly,due to the memory effect of LDH,the double type II heterojunction formed between LDO/LDH/BTO effectively inhibits the recombination of photogenerated electron-hole pairs,thus greatly improving its photocatalytic degradation effect.3.We use the LDO-HSs@ATO in topic 1 as the core material,and coat a layer of phospholipids to form liposomes,and then insert carbon nanotubes into the lipid membrane to form a channel,forming an artificial cell material with a tertiary structure(LDO-HSs@ATO@Liposome@CNTs).We used this material to degrade four dyes(Rhodamine B,Methylene Blue,Malachite Green,Brilliant Yellow).Characterization by confocal fluorescence microscopy and molecular dynamics calculation simulations proved that the dye molecules enter the liposomes through carbon nanotubes and undergo photocatalytic degradation reactions with the core materials.We also explored the adsorption of this artificial cell material and dye molecules through adsorption isotherms and reaction kinetics.This artificial cell material has high efficiency for the degradation of dyes,is easy to recycle,has low environmental toxicity,and is an environment-friendly nano material.