关键词: 废茶, 活性炭, 制备, 孔结构, 控制

Abstract: Activated carbon was prepared from waste tea by activation with K2CO3 and ZnCl2. The effects of activation temperature，activation time and impregnating ratio on the pore structure of activated carbon were investigated. The activated carbon activated by K2CO3 and ZnCl2 was mainly micro-porous. Waste tea activated carbon obtained by K2CO3 activation had a high surface area of 1388 m2/g，and that obtained by ZnCl2 activation had a high surface area of 1596m2/g. Activation temperature had a significant effect on mesopores of the waste tea activated carbon. Mesopores were formed on the activated carbon by ZnCl2 activation at 350℃. When activation temperature increased from 500℃ to 700℃，mesopore volume decreased from 0.55cm3/g to 0.06cm3/g. Mesopores were formed on the activated carbon obtained by K2CO3 activation when activation temperature was 800℃. Mesopores began to form on the activated carbon activated by ZnCl2 activation at 0.5h. Micropore size of carbon activated by ZnCl2 activation expanded from 0.83nm to 0.87nm when activation time increased from 0.5h to 1.5h，and shrunk at 2h. Mesopores of waste tea carbon activated by K2CO3 began to appear when activation time was up to 2.5h. The largest micropore volume of waste tea activated carbon was obtained when ZnCl2 or K2CO3 impregnation ratio was 1∶1.

Key words: waste tea, activated carbon, preparation, porosity, control