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Chemistry and Industry of Forest Products ›› 2016, Vol. 36 ›› Issue (6): 93-99.doi: 10.3969/j.issn.0253-2417.2016.06.015

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Effects of Particle Size and Water Content of Raw Materials on Properties of Activated Carbon Prepared by H3PO4 Activation

TIAN Xiao-yun, DONG Yin-sheng, YANG Jia-nan, ZHANG Cheng-ming   

  1. College of Materials Science and Engineering, Southeast University, Nanjing 211189, China
  • Received:2016-02-29 Online:2016-12-25 Published:2016-12-23

Abstract: Activated carbons were prepared from walnut shell and apricot shell by H3PO4 activation. Effects of different raw material particle sizes and water contents on the methylene blue value, iodine value and yield of activated carbons were investigated. The results showed that the particle size and water content of raw materials had significant influence on activated carbons' absorption capability. Reducing the particle size within a certain range has positive effect to increase the absorption capability. However, the influences of water content were different between walnut shell and apricot shell. Increasing the water content had negative effect to the properties of activated carbon prepared from apricot shell with small size, but it was beneficial to the properties of activated carbon prepared from walnut shell. When walnut shell had the particle size of 0.5-0.7 mm and water content of 11%, the activated carbon by H3PO4 activation gave the yield of 41%, methylene blue value of 230 mg/g and iodine value of 874 mg/g. When apricot shell had the particle size of 0.7-1.2 mm and water content of 0%, the activated carbon had the yield of 42%, methylene blue value of 87 mg/g and iodine value of 734 mg/g.

Key words: walnut shell, apricot shell, activated carbon, water content, raw material particle size

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