Preparation And Catalytic Performance For Oxidation Of Chitosan Supported Metal Complexes

In this thesis, some natural polymer chitosan-supported metal complexes were prepared and characterized. And their catalytic performances in the oxidation of phenol and degradation of methyl orange were mainly investigated.Firstly, natural polymer chitosan was chosen as raw material, which was appropriate chemical modified with salicylaldehyde to obtain chitosan-schiff base ligand. And then it was coordinated with some metal ions, such as Cu2+, Co2+, Fe3+. The characterization of chitosan-schiff base supported monometallic and bimetallic complexes were carried out with UV, FT-IR and XPS.Secondly, catalytic performance of chitosan-schiff base supported metal complexes for hydroxylation of phenol with hydrogen peroxide was studied. It can be seen from the experimental results that chitosan-schiff base supported Cu complex catalyst show much better catalytic performance than other catalysts. In order to optimize the reaction conditions, the influence of Cu content, the usage of hydrogen peroxide and solvent, reaction temperature and reaction time on the reaction were investigated, and the best results were obtained. Using optimal reaction conditions, phenol conversion was 46.7%, and 70.8% selectivity for catechol and hydroquinone.Finally, chitosan-schiff base supported metal complexes as catalysts for degradation of an azo dye methyl orange with hydrogen peroxide were investigated. The catalysis activity was evaluated by using the discoloration of methyl orange. Methyl orange was used as a model azo dye, if chitosan-schiff base supported metal complexes as catalysts can successfully degrade methyl orange, the analogical organic compounds may use in similar ways. It was found that the chitosan-schiff base supported Cu complex and chitosan-schiff base supported Cu-Fe complex had the highest catalytic activity. And degrade methyl orange obviously. According to the results, the nature polymer chitosan supported metal complexes prove to be active. And mild reaction conditions, the simple procedure will make this catalytic system attractive.