Fabrication Of Artemia Cyst Shell-based Nano-self-assembly Composites For Catalytic Performance

Water pollution is one of the more common pollution methods in today’s society.The discharge of industrial wastewater（including dyes,heavy metals,organics and other toxic and harmful substances）is the main cause of pollution.Facing increasingly severe water pollution problems,the demand for efficient wastewater purification materials is also increasing.Artemia cyst shell（ACS）,as a natural biological material,has a large number of microporous structures,so it can be used as a carrier for high-efficiency nanoscale catalytic materials.The main content of this paper is to study and discuss two kinds of eggshell-based nanocomposites and their catalytic properties.Firstly,the ACS-TiO₂-MoS₂ nanocomposite prepared by a combination of high-temperature calcination and hydrothermal synthesis.The egg shell（ACS）showing a highly porous structure after pretreatment is mixed with a titanium-containing organic solution to form a suspension,filtered and dried to form an ACS-TiO₂ binary porous structure;secondly,sodium molybdate and thioacetamide When mixed with this product,MoS₂ nanosheets are supported on a highly porous structure through a simple hydrothermal reaction,which greatly increases the active sites of MoS₂.According to the ultraviolet spectrum after catalytic reduction,the material has a good reduction effect on2-nitroaniline（2-NA）and p-nitrophenol（4-NP）,which is significantly higher than that of ACS-TiO₂ and MoS₂ under the same conditions,and has good stability.Secondly,the properties of ACS-ZnO nanocomposites and their photocatalytic degradation properties of dyes were studied.The synthesis of this material also uses a combination of high-temperature calcination and hydrothermal synthesis.After pretreatment of the egg shell,the organic porous skeleton is formed by high-temperature calcination,and then ZnO nanoparticles are loaded on the structure by hydrothermal reaction to synthesize the target product.Finally,the material was used to degrade three dyes:methylene blue,rhodamine B and neutral red under ultraviolet light.The results show that the photodegradation effect of ACS-ZnO nanocomposites with a 40%ZnO content is significantly stronger than that of pure ZnO nanoparticles.At the same time,cyclic experiments show the high stability and sustainable use of this material.