Abstract
In this article, Zhejiang diatomite was modified by crown ester and calix[8]arene via a decyclization and polymerization of epoxy resin. Using spectrophotometer at 655 nm with dicarboxyarsenazo III as solvent, the isotherm of the modified diatomite adsorbing trivalent neodymium ions was determined that changed from II type to IV, V type respectively when diatomite was covered more than 0.075 g supramolecule/g diatomite, and the adsorption isotherm equation was also obtained. Adsorption of trivalent neodymium ions on the diatomite or the supramolecule modified diatomite was pH-dependent and well fitted by pseudo-first-order and pseudo-second-order kinetic model when the rate constants were allowed to be evaluated separately.
Acknowledgments
We thank the National Natural Science Foundation of China for financial support (No: 20577010).