Study On Preparation Of Azo Calixarene Li~+ Molecularly Imprinted Polymer And Its Performance

Lithium and its compounds as a reputation of “monosodium glutamate industrial”, have important strategic significance in spaceflight and energy. In terms of chemical power source, the study of lithium battery has become a worldwide research, and it will replace the traditional fuel in the future as a powerfull equipment of energy storage, and it has a reputation to be a new type of energy storage in the 21 st century. Lithium and its compounds are also widely used in the glass, ceramics, antilubricant, refrigerating fluid, metallurgy, pharmaceutical and chemical industries. Compared with traditional lithium brine and lithium ore, lithium resources in the sea is more abundant.Nowadays, proven technique of extracting lithium technology is molecular sieve technology. Imprinting technology, which is different from molecular sieve technology, was used in this paper. It succeed in the preparation of the molecularly imprinted polymers(MIPS), which can select to extract lithium ion due to environmental friendly and recycled. Lithium ion imprinting technology is used in the seawater as a new direction of the development of molecular imprinting technique. Furthermore, it is already applied to extract lithium in the seawater, which is extremely creativity in this field, besides the molecular sieve of extracting lithium technology. In ion imprinting technology, the template ion and functional monomer are chelated, and the coordination effect between them is more stable than non covalent bonds. At the same time it can be controlled combination and rupture velocity of coordination bond by changing the conditions.The adsorption effect of Li+ was obtained by the thoron spectrophotometric method, which determinates the absorbance of Li+ in eluent to obtain Li+ concentration. The MIP’s largest lithium absorption capacity of 20.43 mg/g is measured in the solution containing 300 mg/L Li+ at 20℃,after 12 h adsorption and eluted with 1 mol/L, 40 ml HCl. However, absorption capacity of lithium in the artificial seawater is 4.15 mg/g in the same condition. MIP can effectively absorb lithium which contains the alkali metal and alkaline-earth ions of Na+、K+、Mg2+、Ca2+ at pH is 5-9. Moreover, the selectivity of lithium ion is more than 98.5 %. Absorption capacity of MIP is only fell by 7 % and mass loss is about 20 % after 5 times adsorption experiment. It has good application prospect, because of highly stability and good renewable performance.