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Journal of Inorganic Materials

Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (8): 893-903.DOI: 10.15541/jim20200632

Special Issue: 【虚拟专辑】污染物吸附水处理(2020~2021)

• RESEARCH LETTER • Previous Articles    

Ultra-large Specific Surface Area Activated Carbon Synthesized from Rice Husk with High Adsorption Capacity for Methylene Blue

ZHOU Fan1,2(), BI Hui1, HUANG Fuqiang1,2,3()   

  1. 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
    3. State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2020-11-05 Revised:2020-12-08 Published:2021-08-20 Online:2020-12-10
  • Contact: HUANG Fuqiang, professor. E-mail: huangfq@mail.sic.ac.cn
  • About author:ZHOU Fan (1994-), male, Master candidate. E-mail: 1175106021@qq.com
  • Supported by:
    National Key Research and Development Program of China(2016YFB0901600);National Natural Science Foundation of China(51972326);National Natural Science Foundation of China(51672295);National Natural Science Foundation of China(21871008);National Natural Science Foundation of China(51672301);Science and Technology Commission of Shanghai(18YF1427200);The Key Research Program of Chinese Academy of Sciences(QYZDJ-SSW-JSC013)

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Abstract:

Activated carbon with high surface area and abundant pore structure is widely used for contaminant adsorption in wastewater treatment. Rice husks (RHs) with unique composition and microstructure are often used as carbon source to prepare activated carbon. Herein, ultra-large specific surface area activated carbon was synthesized from rice husks with pre-activation and activation by supersaturated KOH solution at different temperatures. With the increase of activation temperature, the specific surface area and total pore volume of activated carbon gradually increase. The activated carbon obtained at 900 ℃ shows the largest specific surface area of 3600 m2/g and the maximal total pore volume of 3.164 cm3/g, which are significantly superior to those of the commercial activated carbon (YP-80, the specific surface area of 1310 m2/g and the total pore volume of 0.816 cm3/g, respectively). The highest maximum adsorption capacity for methylene blue was found for the activated carbon with the largest specific surface area, namely, 983 mg/g, which is almost twice as high as that of YP-80 (525 mg/g). By adsorption kinetics fitting, the results are consistent with pseudo-second-order model which indicates that the process of adsorbing methylene blue is chemical adsorption.

Key words: rice husk, ultra-large specific surface area, activated carbon, adsorption, methylene blue

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