Preparation Of Layered Metal Sulfide/polymer Composites And Its Deep Purification Of Heavy Metal Wastewater

With the development of economy and technology,the problem of water pollution has become more and more serious.Among them,heavy metals and cationic dyes are the two main pollutants causing water pollution.It is particularly important to select efficient,economic and environmental friendly pollution control technologies for heavy metals and cationic dyes.In recent years,layered metal chalcogenides have attracted much attention because of their open and accessible structure of layered anion skeleton and movable interlayer cations,which can effectively adsorb heavy metal ions.However,due to its small size,it is not easy to be applied to overcurrent system.To solve the above problems and the introduction of macroporous chlorine ball resin,which has high mechanical and chemical stability and excellent hydrodynamic properties;also introduced sodium alginate gel beads,sodium alginate molecules contain hydroxyl and carboxyl groups,can be electrostatic adsorption and chelation with cations,so sodium alginate can be used as an excellent adsorption material.In this thesis,FJSM-GAS-2/PS was prepared by compositing the layered metal sulfide FJSM-GAS-2 with chlorine spheres;KTS-3/SPS was prepared by combining KTS-3 with chlorine spheres and then sulfonating them;FJSM-Sn S/SA gel spheres was prepared by composing FJSM-Sn S with sodium alginate.The three composites were characterized by XRD,SEM,EDS,FTIR and BET,and the adsorption properties of the composites on lead ions,cesium ions,methylene blue,and paraphenylene hydrochloride in aqueous solution were investigated using the batch experiment method.The effects of initial concentration,p H,dosing amount and interfering ions on the adsorption performance were investigated.The adsorption kinetic data were fitted by quasi first-order and quasi second-order kinetic models,and the isothermal adsorption data were fitted by isothermal adsorption model.The results showed that the adsorption of Pb²⁺and Cs⁺by the prepared FJSM-GAS-2/PS reached equilibrium at 60 min,and the removal rates reached 97.37%and 94.10%,respectively.The adsorption kinetics was more consistent with the quasi-secondary kinetic model,and the adsorption isotherm model was more consistent with the Langmuir isotherm model;the adsorption of Pb²⁺and Cs⁺by the prepared KTS-3/SPS reached equilibrium at 120 min,and the removal rates reached 95.62%and 93.66%,respectively.The adsorption kinetics were more in line with the quasi-secondary kinetic model and the adsorption isotherm model was more in line with the Langmuir isotherm model;the adsorption of methylene blue and parapenta hydrochloride by the prepared FJSM-Sn S/SA reached the equilibrium at 360 min and 1080 min,respectively,and the removal rates reached 99.17%and 93.66%,respectively.The adsorption kinetics were more consistent with the quasi-secondary kinetic model,and the adsorption isotherm model was more consistent with the Freundlich isotherm model.The composite material prepared at the same time can be reused at least three times.