Preparation Of Self-Assembled Core-Shell Materials And LB Films And Study On Their Dye Adsorption And Gas Detection Performance

With the continuous development of the chemical industry,the industrial wastewater has also been increasing.The comprehensive treatment of industrial wastewater has become a tremendous problem to be solved urgently in the world environmental scientific community.The preparation of an adsorbent with a large specific surface area,a suitable pore structure,low cost and simple operation has become the main research direction.Molecular self-assembly technology at the gas/liquid interface is an effective means to obtain ultrathin ordered molecular films.It can be assembled at the molecular level,and prepared single film and multilayers with accurate and controllable thickness,clear structure and anisotropy.The LB films,which form complex or ordered entities and aggregates with certain functions and properties,can be used as nanocomposite coatings,gas sensitive films,optical materials,etc.In this paper,the research work includes two sections.The first part had prepared self-assembled molybdenum disulphide composite nanomaterial,and their structure and adsorption properties were studied.In the second part,the molecularly ordered films are prepared by Langmuir-Blodgett?LB?technique using different kinds of terpyridine derivatives with different spacers,and their molecular self-assembly behavior at the gas/liquid interface were studied.Firstly,new MoS₂-PDA core�shell nanocomposite materials were successfully prepared through the self-assembly of mussel-inspired chemistry.A variety of characterizations revealed that the surface of the flake MoS₂ was evenly coated with a thin layer of PDA,and the material has a large specific surface area and porous structure.Dye adsorption performances of the synthesized MoS₂-PDA nanocomposites were investigated at different pH values and reaction times.Compared with the pure MoS₂ nanosheets,the obtained core�shell nanocomposites had showed elevated adsorption performances and high stability,which can be applied to wastewater treatment as a new composite material.Through LB technology,the supramolecular ordered films on the gas/liquid interface were prepared by adding terpyridine molecules to the different subphase.The prepared LB films were characterized by atomic force microscopy,UV-vis spectra,transmission electron microscopy and so on.Meanwhile,the interfacial diffusion behaviors and coordination of terpyridine molecules with different subphases in the obtained LB films were studied.The transferred multilayer films were continuously exposed to the acid-base gas atmosphere.In addition,to characterized the LB films by UV-vis spectra and FT-IR spectra.The results showed that the prepared LB films showed good acidichromism properties and could be used in the study of gas detection behavior research.