Microwave Assisted Pyrolysis of Collagen Fiber-Immobilized Tannins by the Catalysis of in situ Fe2O3
Collagen fiber based adsorbents have gradually received attention due to their exceptional performances in nuclide adsorption,but the final disposal of those adsorbents remains a concern.In this study,the pyrolysis of collagen fiber-immobilized tannins(CFT)was conducted by the catalysis of in situ Fe2O3 for the purpose of safe and effective volume reduction.The pyrolysis process was first investigated through thermogravimetric analysis technique,and it was found that the Fe3+doped into CFT(Fe-CFT)could lower the pyrolysis temperature to approximately 450 ℃,which is 150 ℃ lower than that of direct pyrolysis without catalysts,while the residual rate was only 9.5％.Furthermore,the microwave-assisted pyrolysis of Fe-CFT was conducted using nano-Fe2O3 as the heat transfer medium,the residual rate of Fe-CFT decreased further to 2.1％.The solid residue was then undertaken Fourier transform infrared spectroscopy,X-ray diffraction and elemental analyses,and it was found that the Fe3+doped into CFT was converted into Fe2O3,which effectively promoted the CFT pyrolysis process.In summary,this study innovatively utilizes microwave heating technology to effectively reduce the pyrolysis temperature of CFT through in situ Fe2O3 catalysts,and the residual rate is very low,thereby achieving safe and efficient volume reduction of radioactive waste of collagen fiber-based adsorbents.
collagen fibertanninsadsorptionFe2O3 in situcatalytic pyrolysisvolume reductionmicrowave assisted pyrolysis
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