I&EC 58 |
| An advanced oxidation process, ultrasound/H2O2 oxidation was used for the decolorization of crude polysaccharides from Cyclocarya paliurus (Batal.) Iljinsk. The decolorization efficiency is strongly dependent on concentration of initial crude polysaccharide solution, dosages of hydrogen peroxide, temperature, pH value of solution and ultrasonic irradiation. The effects of these operating parameters on decolorization of the crude polysaccharides have been evaluated and the optimum operational conditions of the process were studied. FTIR spectra method was used for the analysis of change in the macromolecular structure of polysaccharides. The results showed that ultrasound/H2O2 oxidation process represented good decolorizing ability on decolorization of crude polysaccharides. The optimum operational conditions for decolorization were determined as follows: concentrations of the polysaccharide solution: 0.5mg/mL, H2O2: 0.623mmol/L, T=40ºC, pH=9.0 with a constant ultrasound of 40 kHz and at sonic power of 100 W. Under these conditions, the results were obtained with a decolorization rate of 84.0% and a polysaccharides holding rate of 80.9%. The FTIR spectra indicated that ultrasound/H2O2 oxidation process did not result in any significant change in the macromolecular structure of polysaccharides. Supported financially by Program for Changjiang Scholars and Innovative Research Team in University (No: IRT0540). |
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IEC Poster Session
8:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Industrial & Engineering Chemistry |