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Biomass Chemical Engineering ›› 2022, Vol. 56 ›› Issue (1): 1-6.doi: 10.3969/j.issn.1673-5854.2022.01.001

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Preparation and Characterization of Corn Straw Based Activated Carbon by Phosphoric Acid Activation

Ruting XU1,2, Xincheng LU1,2, Wei XU1,2, Ao WANG1,2, Kang SUN1,2,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-10-21 Online:2022-01-30 Published:2022-01-18
  • Contact: Kang SUN E-mail:sunkang0226@163.com


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.

Key words: corn straw, activated carbon, phosphoric acid, preparation

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