| Nowadays,the toxic metal ions not only damage the environment,but also do harm to our health indirectly,which has become a critical issue worldwide.Lead ions contaminate the global water resources,and bring serious harm to marine life and human health.Therefore,increasing demands for clean and safe water make it greatly important to develop reliable methods for the removal of Pb2+ from environmental waters.Adsorption is regarded as the most attractive method in practical application owing to its simple operation,superior efficiency and environment friendly.Iin adsorption processes,the choice of an appropriate adsorbent is the key factor to achieve high adsorption capacity,good selectivity,regeneration and short analytical time.This thesis aims at synthesizing a kind of high adsorption capacity,high efficient,low cost,renewable and environmentally friendly adsorption material,and applying it for the removal of Pbro in the water.This thesis is divided into two parts:Part Ⅰ:A new type of Pb2+ imprinted magnetic nanoparticles was prepared using PEI@Fe3O4 fabricated by solvothermal method as core,Pb2+ as a template ion,epichlorohydrin as crosslinking agent,and EDTA and HCl as eluent.Then,they were characterized by TEM,XRD,FT-IR and EDS.Part Ⅱ:The effects of pH,reaction time and the initial concentration of Pb2+ on the adsorption rate of Pb2+ were examined by static adsorption method and using FAAS as determnaiton method in detail in this study.The adsorption selectivity of two materials for Pb2+ was investigated using Cd2+ and Cu2+ as competitive ion.The Langmuir isotherm model was used to for the isotherms study and Ho pseudo-second order kinetic equation was applied to study the sorption kinetics.The maximum adsorption capacity of the materials can reach 110 mg·g-1 and the material can be reused at least 5 times when using 0.1 mol·L-1 HCl as desorpion solvent,and adsorption performance is also good. |
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