%A Ruting XU, Xincheng LU, Wei XU, Ao WANG, Kang SUN %T Preparation and Characterization of Corn Straw Based Activated Carbon by Phosphoric Acid Activation %0 Journal Article %D 2022 %J Biomass Chemical Engineering %R 10.3969/j.issn.1673-5854.2022.01.001 %P 1-6 %V 56 %N 1 %U {http://www.bce.ac.cn/CN/abstract/article_1176.shtml} %8 2022-01-30 %X

Corn straw based activated carbon was prepared from corn straw after formed and torrefied by H3PO4 activation and characterized by N2 adsorption, elemental analysis and FT-IR. The results showed that the optimal conditions were the impregnated ratio of 4∶1, the activation temperature of 400 ℃ and the activation time of 100 min. Under these conditions, the yield of activated carbon was 47.78% and the activated carbon showed excellent adsorption capacity with the iodine adsorption value of 864 mg/g, the methylene blue adsorption of 210 mg/g and the caramel decolorization of 100%. The specific surface area and the total volume of activated carbon reached 1 105 m2/g and 0.745 cm3/g, the micropore volume was 0.287 cm3/g, the mesopore volume was 0.354 cm3/g. Meanwhile, the distribution of pore was concentrated within 5 nm, accounting for 73.56%, and the average pore diameter is 2.697 nm. The FT-IR results showed that the crosslinking reaction was occured between H3PO4 and corn straw during octivation and the activated carbon lost some functional groups of corn straw.