Microwave Hydrothermal Synthesis Of Lead Ion Imprinting Polymer

Lead is one of the most serious environmental pollutants in human civilization. The harm of lead poisonedis it will hurt skeletal system, nervous system, blood system, cardiovascular system all our lifetime. This damage is even more serious on children. Due to the interference of coexisting elements when we analysis the trace and ultra-trace of mining, industry, agriculture and biotechnology pollutants, today's analysis technology is often restricted. We have toseparate and enrich the samples first if we want to increases analysis result sensitivity. Thus producing polymer with higher selectivity of lead ions is of crucial importance.This article innovatively adopts microwave hydrothermal method to produce three types of lead ion imprinted polymers (IIPs) and studies the lead ions adsorption of these new three polymers. We use quadrol, diethylenetriamine and sulfourea as functional monomerrespectively (called 1st,2nd and 3rd·imprinted polymer). After modifythe surfaceby gamma-Chloropropyl trimethoxy silane, then the activated silica gel will be mixed with a percentage of lead ionssolution with quadrol, diethyl lenetriamine and sulfourea. Then put the mixtureintothe microwave chemistry workstation and finally we produced ion imprinted successfully.This article studies the preparation technology of the lead ion imprinted polymers and obtains the method of three types lead ion imprinted polymers:immerse the silica gel in the 6 mol/L HC1 solution for 24 hours, then stem grafting with gamma-Chloropropyl trimethoxy silane in the condition of cyclohexane as solution environment, and then we obtain CP-SiO2. The CP-SiO2 will be mixed with quadrol, diethylenetriamine and sulfourea to response for a contain time.The adsorption capacity of 1st IIP is 17.0 mg/g,2nd IIP is 18.2 mg/g and 3rd IIP is 20.0 mg/g. The IIP with sulfourea functional monomer is the best one of all the three IIPs. By electron microscopic scanning figure that polymers were covered by manyfme holes on the surface, specific surface area was amplified. The adsorption capacity can reach 18.0mg/g. All these IIPs'adsorption of lead ions is described by Langmuir isotherm equation, single molecular layer adsorption. The pH has great influence on the sorption, and as pH=5, the adsorption capacity is the greatest. The new method of preparation of molecularly imprinted polymers have higher reuse performance, repeated use can reach more than 95% of the elution rate. The adsorbing capacity increases with temperature rising. The IIP has much more adsorbing capacity than the NIP. What's more, microwave hydrothermal synthesis of molecularly imprinted polymers have spent less time and imprinting effect obvious characteristics, greatly saves the response time and cost.