Study on Preparation and Characterization of Nano-Hap under Different Conditions and Sorption Properties for Rare-Earth Ions in Water

Study on Preparation and Characterization of Nano-Hap under Different Conditions and Sorption Properties for Rare-Earth Ions in Water
　　As main mineral components of bone and teeth of bamniote, nano Hydroxyapatite (n-HAP) has good biological compatibilitu and activity. It is non-toxic to human body and environment. Numerous studies have been carried out to investigate the organism renovation, adsorbing metal ions, transferring drug and protein molecules. But there dosen’t have any report about the nano-HAP adsorpe the rare earth pollutions in waste water as a kind of environmental protection material.Ball Neodymium Magnets Researchers paied more attention to the preparation technologies of nano-HAP, because of it’s characteristic and merit. The present paper takes the na-HAP’s size and the appearance controllable preparation as a starting point, has used four different chemistry preparation methods prepares the nano-HAP, whose sizes and shapes are significantly different. The nano-HAP which has small size and big surface area was slected and used to repare the rare earth polluted water. The concrete research content is as follows:The nano-HAP powders were prepared by chemical precipitation. In this study, Ca(NO3)2 and (NH4)2HPO4 were used as reagents, nano-hydroxyapatite was prepared in water media. The effects of starting reactant concentration, the types of precipitating agent and heat treatment have made results in partical size, crystal, dispersion degree, purity influences.
　　The simple technological of repare nano-HAP was explored.The nano-Hap were successfully synthesized with CaHPO4 and Ca(OH)2 by hydrothermal technique. The component and the structure of all samples have been identified and http://www.chinamagnets.biz/ researched. The study indicated the reaction temperature and the solution pH valued to the HAP micrite size. The nano-HAP was prepared whose length in 300-500nm, diameter in 50-100nm and the length to diameter ratio in 3-10 under the suitable optimized condition. This kind of nano-HAP has high crystallinity and good dispersivek.The spherical nanometer nano-HAP was prepared by sol-gel method. In this mathod we taked calcium nitrate and phsophorus pentoxide as the forerunner body and synthesised in the ethyl alcohol solution. The findings indicated Ball Neodymium Magnets the aged time has great effect on the crystallinity and purity. The nano-HAP was used to remove the rare earth ions from water-soluble fluid. We selectes La, Y, Gd took the light rare earth, the heavy rare earth and the middle rare earth elements representatively. The nano-HAP was prepared by the chemical precipatation. The result indicated, the dissolution amount of HAP increased with decersing pH, and on the same pH conditions, the dissolutionrates and amounts of nano-sized HAP were all higher than the bulk HAP. At the same pH values, the immobilization ability of nano-HAP is higher than the bulk HAP. While at the same effect, nano-HAP can be achieved at a relatively low acidity. Increase the amount of nano-HAP would be conducive to the removal of rare earth ions, but at a higher pH the effect of significantly enhanced.