Preparation Of Polymer Microsphere Composites And Research Adsorption Properties For Dyes

The rapid development of industrial activities has led to the discharge of a large number of pollutants into the environment,especially dyes and heavy metals,which have aroused great concern all over the world.Dyes are colored compounds that have mutagenic and carcinogenic effects on various life forms,while heavy metals have harmful health effects on human beings and other organisms.Therefore,there is an urgent need to formulate remediation strategies that can effectively alleviate the pollution of dyes and heavy metals.Among the many repair technologies,adsorption has become one of the most popular repair technologies because of its simplicity,easy operation,relatively low cost and strong adaptability.Polymer microspheres have the advantages of good stability,large specific surface area and easy preparation,leading to the potential of efficient and fast adsorption materials.However,the polymer microspheres themselves have poor adsorption properties for dyes,so the composite adsorption materials are mainly prepared by functionalizing the surface of polymer microspheres,which can effectively improve their adsorption properties.It has certain research value and practical value in the process of practical application.In this paper,monodisperse polystyrene(PS)microspheres and monodisperse dairy microspheres(PSMA),were prepared by dispersion polymerization and emulsion polymerization,respectively.Composites were prepared via the surface modification of the PS and PSMA,and their adsorption properties for dyes in water were studied.The main research work of this paper is as follows:1.The surface of PS was sulfonated,and monodisperse sulfonated polystyrene microspheres(SPS)were successfully prepared.The effects of different factors on the adsorption properties of SPS were studied systematically.The results show that SPS has good adsorption performance for methylene blue(MB)/methyl violet(MV),and its adsorption process is more consistent with the quasi-second-order adsorption kinetics and Langmuir isothermal adsorption model,and the theoretical maximum adsorption capacity is 109.89 mg/g and 265.25 mg/g,respectively.After 5 cycles of adsorption and desorption experiments,the removal rate of MB can still maintain more than 97%,indicating that SPS is expected to become a fast and efficient adsorbent.2.Polyaniline/core-shell microspheres(PANI/PSMA)composites were successfully prepared by in-situ polymerization.The effects of different factors on the adsorption properties of PANI/PSMA were studied systematically.The results show that the prepared PANI/PSMA,has good adsorption properties for methyl orange(MO),and the adsorption effect is the best when pH=4 is used.After fitting,the adsorption process of PANI/PSMA to MO is more consistent with the quasi-second-order adsorption kinetics and Langmuir isothermal adsorption model,and the theoretical maximum adsorption capacity is 152.84 mg/g.After 5 times of cyclic adsorption and desorption experiments,the removal rate of MO by PANI/PSMA is more than 90%.3.Polypyrrole-Polyaniline/core-shell microspheres(PPy-PANI/PSMA)composites were successfully prepared.The effects of different factors on the adsorption properties of PPy-PANI/PSMA were studied systematically.The results show that PPy-PANI/PSMA has good adsorption performance for Congo red dye,and the adsorption effect is the best when pH=4 is used.The adsorption of Congo red by PPy-PANI/PSMA is more consistent with the quasi-second-order kinetic model and Langmuir isothermal adsorption model,and the theoretical maximum adsorption capacity is 512.82 mg/g.After four times of cyclic adsorption and desorption experiments,the removal rate of CR by PPy-PANI/PSMA is more than 90%.