Study On Sythesis And Adsorption Performance Of Chitosan Resin With Template Of Ni-Ion

In view of the nickel processing during the missile manufacturing in PLASecond Artillery Corps, the processing waste water recycles with great difficulty,the resin was synthesized by cross-linking chitosan with glutaraldehyde andwith Ni²⁺ as template.Chitin is a kind of crude macromolecule material inthe present thesis. The production of chitin which has been removed acetylis called chitosan. They has a preferable application in the field ofWastewater disposal。The adsorption behavior of chitosan on Ni²⁺ was studied. Thestructure and morphology of the complexes was obtained by FTIR and SEM.The adsorption capacity of the complexes of CTS-Ni²⁺ on different metalions was also studied. The crosslinking degree of the resin is increasingwhen the dosage of glutaraldehyde has been increased, but it remainsunchanged when the ratio of raw materials reaches a certain volume;Crosslinking degree of the resin is increasing with the enhancement oftemperature and time of the reaction system. The major factors that affectthe adsorption capability of chitosan are adsorption time, quantity of theresin, initial ionic concentration, pH of the medium etc.The structure was identified by FTIR and SEM, in order to study themajor factors that affected the adsorption process. The result indicates thatthe -NH2 of the resin and Ni²⁺ have reacted. Through SEM we can concludethat cross-linking chitosan may be more conducive to adsorption.Adsorption influencing factor of the resin on Ni²⁺ were studied. Theadsorption experiment shows that the adsorption time is about 4h. As the pHvalue is increasing, the adsorption capacity of the resin on Ni²⁺ increases.The adsorption capacity reaches a maximum when pH is 7.0⁸.0. But when pH> 8.0, it is on a declining trend. In the temperature ure range of 30℃to 40℃, the adsorption capacity increases with temperature increasing, but theadsorption capacity is on a declining trend when the temperature continuesto rise. The resin which has a little change on weight and adsorptioncapacity after regeneration, can be reused.