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Chemistry and Industry of Forest Products ›› 2020, Vol. 40 ›› Issue (3): 115-122.doi: 10.3969/j.issn.0253-2417.2020.03.015

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Optimization of Design of Lignin-based Activated Carbon Based on Response Surface Methodology

Xinglong HOU1,2,Qi GUO1,Xiaopeng JIAN1,Dichao WU1,Wei XU1,Junli LIU1,*()   

  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:2019-10-23 Online:2020-06-28 Published:2020-06-29
  • Contact: Junli LIU E-mail:liujunli1974@126.com


Lignin-based activated carbon was prepared from corn cob lignin by using phosphoric acid activation method.Taking methylene blue adsorption value (MB) as the index, the interaction during the preparation of activated carbon were explored by Plackett-Burman design, the steepest climbing test, and the center composite design method.The results showed that the three most important factors obtained by Plackett-Burman design were immersion ratio, activation temperature, and activation time.The best center region was determined through the steepest climbing test.The optimal process conditions obtained by the center composite design (CCD) and response surface analysis (RSM) were impregnation ratio 3:1(g:g), activation temperature 563℃, and activation time 2.75 h. The verification experiment was performed under the above optimized process of 60% phosphoric acid mass fraction, 12 h immersion time, 90℃ immersion temperature. The pore size of the lignin-based activated carbon was mainly concentrated at 2-10 nm, the BET specific surface area was 1 436 m2/g, total pore volume was 1.041 cm3/g, the micropore pore volume was 0.385 6 cm3/g and the methylene blue adsorption value (MB)was 240 mg/g.

Key words: phosphoric acid activation, lignin, activated carbon, mesopores

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