PULPING BLACK LIQUOR DERIVED LIGNIN CARBON SPHERE. PREPARATION AND PROPERTIES

摘要

Pulping black liquor derived lignin carbon sphere was prepared through selected extraction, hydrothermal modification and inert atmosphere pyrolysis. During modification process, sulphuric acid acted as structure directing agent for lignin in order to obtain spherical structure. The properties of the products were significantly affected by pyrolysis temperature. FTIR spectra curves suggested that there were structure transformations of phenyl rings below 600 degrees C. The electrochemical performances of the products, capacitance and impedance, were adjustable through controlling different reaction conditions. XRD patterns were utilised to estimate the graphitisation degrees of lignin carbon spheres. Sulphuric acid used in the pretreatment process was recyclable and the whole procedure was cost-effective.