Preparation and Characterization Analysis of Activated Carbon from Camellia oleifera Shell by K2CO3 Activation
Using K2CO3 as the activating agent,Camellia oleifera shell(COS)was used as the raw material to prepare COS-based activated carbon through activation in both air and nitrogen atmospheres.The effects of activation temperature,activation time,and K2CO3 impregnation ratio(mL∶g)on the preparation of activated carbon were investigated.The activated carbon was characterized using elemental analysis,Fourier-transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),and other methods.The results showed that with an impregnation ratio of 1.5,temperature of 800℃,and carbonization activation time of 1 h in air atmosphere,the obtained activated carbon had the yield of 12.48%,specific surface area of 1 080.94 m2/g,and methylene blue(MB)adsorption value of 441.62 mg/g.When activated in nitrogen with impregnation ratio of 2.5,temperature of 800℃,and carbonization activation time of 1 h,the obtained activated carbon had the yield of 18.00%,specific surface area of 942.42 m2/g,and MB adsorption value of 428.77 mg/g.The results of elemental analysis showed that activated carbon prepared under a nitrogen atmosphere had a lower H/C elemental ratio and the aromaticity was improved.FT-IR and SEM analysis indicated that activation promoted the thermal decomposition of—CH and—COOH groups and the growth of pores in the activated carbon.Compared to the samples prepared under a nitrogen atmosphere,activated carbon produced by air as pyrolysis had more developed pores and better adsorption performance.
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