磷酸活化法制备纤维素基颗粒活性炭

doi:10.3969/j.issn.0253-2417.2014.01.017

Abstract

Abstract: Microcrystalline cellulose was used to prepare cellulose-based granular activated carbon by phosphoric acid activation without any other binder.The effect of kneading and carbonization/activation process on abrasion strenth, adsorptive properties and porous texture of granular activated carbon was discussed.The results showed that both increasing temperature and prolonging holding time of carbonization/activation were beneficial for abrasion strength improvement. Besides, the adsorption capability of iodine and methylene blue,the special surface area(BET),total pore volume,micropore volume and mesopore volume for granular activated carbon increased with the increasing impregnation ratio.When the impregnation ratio was low,the smaller microporous structure was developed. On the other side, when the impregnation ratio was increased,the bigger microporous structure was enlarged. Under the optimized condition,i.e. kneading temperature 150 ℃, kneading time 55 min, impregnation ratio 1.25,carbonization/activation temperature 450 ℃ and holding time 1.0 h,the iodine adsorption value, methylene blue adsorption value, abrasion strength,BET,total pore volume,microporous volume, mesoporous volume and average pore width of the sample were 896.6 mg/g, 131.3 mg/g, 94.69 %,1 377.3 m²/g,1.083 cm³/g,0.514 cm³/g, 0.569 cm³/g and 3.14 nm,respectively.

Key words: phosphoric acid activation, cellulose, granular activated carbon, porous texture

CLC Number:

LIN Guan-feng, JIANG Jian-chun, WU Kai-jin, CHEN Han, CHANG Ying-cui. Preparation of Cellulose-based Granular Activated Carbon Using Phosphoric Acid as Activator[J]. Chemistry and Industry of Forest Products, 2014, 34(1): 101-106.

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Preparation of Cellulose-based Granular Activated Carbon Using Phosphoric Acid as Activator

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