Electron Beam Effects on Lignin Stabilization during Carbonization

Electron Beam Effects on Lignin Stabilization during Carbonization

Lignin can be a valuable natural chemical resource. Structurally, lignin is a threedimensionalpolymer made up of condensed C-C bonds and some ether linkages, most of whichare not readily degraded. In this study, lignin carbonization under various electron beam pretreatmentconditions was characterized through a thermogravimetric analysis (TGA), X-ray diffraction(XRD) and Raman spectroscopy. Lignin stabilization was controlled by various doses of electronbeam irradiation corresponding to 50, 100, 200, 500 and 1,000 kGy; the carbonization process wasperformed under a nitrogen gas atmosphere at 1000􀆆􀆆C for 1 h. The TGA results showed that a1,000 kGy lignin dose increased the residue weight from 39.96% to 45.23%, compared to nonirradiatedlignin. This observation is in agreement with the XRD and Raman spectroscopy results,in which the two theta degrees and the degree of crystallization were improved by increasing theelectron beam irradiation.

Lignin can be a valuable natural chemical resource. Structurally, lignin is a threedimensionalpolymer made up of condensed C-C bonds and some ether linkages, most of whichare not readily degraded. In this study, lignin carbonization under various electron beam pretreatmentconditions was characterized through a thermogravimetric analysis (TGA), X-ray diffraction(XRD) and Raman spectroscopy. Lignin stabilization was controlled by various doses of electronbeam irradiation corresponding to 50, 100, 200, 500 and 1,000 kGy; the carbonization process wasperformed under a nitrogen gas atmosphere at 1000􀆆􀆆C for 1 h. The TGA results showed that a1,000 kGy lignin dose increased the residue weight from 39.96% to 45.23%, compared to nonirradiatedlignin. This observation is in agreement with the XRD and Raman spectroscopy results,in which the two theta degrees and the degree of crystallization were improved by increasing theelectron beam irradiation.