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Preparation of Spherical Activated Carbon from Alkali Lignin

Spherical activated carbon was prepared from the industrial alkali lignin via three steps: preparation of spherical lignin precursor,carbonization,and activation. Effects of preparation and activitation conditions of spherical lignin precursor on its morphology and particle size of the spherical activated carbon were investigated. SEM,N2(77K) adsorption-desorption isotherm,and FT-IR were used for characterizing its morphology structure, adsorption property, and surface functional groups,respectively. The results showed that spherical lignin precursor with diameter of approximate 5 μm could be obtained under the reaction temperature 90 ℃,stirring rate 200 r / min,reaction time 10 h,and p H 3. 0. After carbonization at 300 ℃ followed by activation at 850 ℃,spherical activated carbon with BET surface area of 776. 96 m2/ g,total pore volume of 0. 487 1 cm3/ g,and average pore diameter of 2. 51 mm could be obtained.