Preparation and Characterization of Mesoporous Activated Carbon from Alligator Weed with H₃PO₄

Abstract:

Alligator weed, containing ash of 8.56 wt.% (dry basis), is a low-cost and renewable material for preparing activated carbon (AC) by chemical activation. Yield and iodine number results of orthogonal experiments showed H₃PO₄ was the optimal activator comparing with NaOH and (NH₄)₂HPO₄. And optimal condition was at impregnation ratio of 4 to 1 with the impregnation time of 6h, carbonization temperature of 873K and carbonization time of 1h. According to calculation of Brunauer-Emmett-Teller (BET), the surface area of P1 (AC prepared by H₃PO₄ under optimum condition) attained the value of 1100.720 m²/g. Calculated by Barrett-Joyner-Halenda (BJH), the total pore volume and average pore size of P1 were 0.610 cm³/g and 2.216nm. The rate of mesoporous range, as high as 72.00%, revealed P1 was mesoporous AC. FT-IR spectrum suggested P1 contained carboxyl, phenol, ether and other functional groups. XRD showed a graphitization degree of 65.12% indicating its high stability in application.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 868-874
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.868
• Online since: June 2014
• Authors: Hui Min Xu, Guo Fu He*, Min Tao Shi, Jun Tu, Wei Liu, Wei Ning Xiang
• Keywords: Alligator Weed, Chemical Activation, Mesoporous Activated Carbon, Optimum Condition, Phosphoric Acid

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