Welcome to Chemistry and Industry of Forest Products,

Chemistry and Industry of Forest Products ›› 2023, Vol. 43 ›› Issue (1): 51-56.doi: 10.3969/j.issn.0253-2417.2023.01.006

Previous Articles     Next Articles

The Relationship Between Pore Size Distribution and Adsorption Properties of Cumaru Activated Carbon Prepared by Phosphoric Acid Method

Mingzhe MA1,2(), Hao SUN1,2,*(), Kang SUN1,2, Mengmeng FAN2, Yanping ZHANG1,2, Jianchun JIANG1,2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; Key Lab. of Biomass Energy and Material, Jiangsu Province; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Najing Forestry University, Najing 210037, China
  • Received:2021-12-05 Online:2023-02-28 Published:2023-02-28
  • Contact: Hao SUN E-mail:398779536@qq.com;15850534739@163.com


The influences of phosphoric acid method activation temperature, phosphoric acid concentration and impregnation ratio on adsorption performance of cumaru activated carbon were investigated by using the processing the residue of hardwood cumaru as a raw material. Structural analysis of activated carbon was analyzed by N2 adsorption-desorption isotherm, and the structure-activity relationship between the effective pore volume and the liquid phase adsorption results(iodine adsorption value, methylene blue adsorption value and caramel decolorization rate) were calculated according to the adsorption theory and DFT pore size distribution map. The results showed that the synthesized activated carbon exhibited excellent adsorption properties and pore structure under the conditions of 60% phosphoric acid solution, the impregnation ratio of phosphoric acid to cumaru 3∶1(mL∶g), the activation temperature of 500 ℃ and the activation time of 120 min. Its iodine value, methylene blue value, caramel decolorization, specific surface area, and total pore volume were 841 mg/g, 270 mg/g, 120%, 1 516 m2/g and 1.145 cm3/g, respectively. These properties were comprehensively superior to those of the activated carbon prepared from the residues of soft wood fir. The corresponding pore volume of different pore size distributions was calculated for cumaru activated carbon using the Density Functional Theory(DFT). After theoretical analysis and fitting calculation, it was found that there was a good linear relationship between iodine adsorption value and pore volume with pore diameter of 1.0-2.7 nm, between methylene blue adsorption value and pore volume with pore diameter of 1.7-5.0 nm, and between caramel decolorization rate and pore volume with pore diameter of 2.7-6.3 nm. These results indicated a good degree of association(R2>0.95) between the pore structure distribution of activated carbon and its liquid phase adsorbing performance.

Key words: cumaru, phosphoric acid activated carbon, pore size distribution, liquid phase adsorption, linear fitting

CLC Number: