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Biomass Chemical Engineering ›› 2021, Vol. 55 ›› Issue (1): 31-38.doi: 10.3969/j.issn.1673-5854.2021.01.005

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Preparation of Activated Carbon from Gasified Rice Husk Char Activated by KOH and Its Adsorption Properties

Youlong WU(), Jialong XU, Zhongqing MA(), Wei CAI, Xiaohuan LIU, Jun QIAN   

  1. School of Engineering, Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Hangzhou 311300, China
  • Received:2019-12-31 Online:2021-01-30 Published:2021-01-25
  • Contact: Zhongqing MA E-mail:wyl980810278@163.com;mazq@zafu.edu.cn


Potassium hydroxide (KOH) was used as activating agent to prepare activated carbon with gasified rice husk char (GRHC) as raw material. The effects of activation temperature and mass ratio of KOH to char on the specific surface area, pore diameter distribution and iodine value of activated carbon were investigated. The physicochemical properties of activated carbon were characterized by automatic gas adsorption analyzer, X-ray diffraction, Fourier transform infrared spectrometer, and scanning electron microscope, et al. The adsorption mechanism of methyl orange was studied by adsorption isotherm and adsorption kinetics. The results showed that when the activation time was 1 h, the yield of activated carbon decreased gradually with the increase of activation temperature and alkali-carbon ratio, and the specific surface area and iodine adsorption value increased first and then decreased. The optimal conditions for preparation of activated carbon were mass ratio of KOH to char 2:1 and activation temperature of 800℃. Under these conditions, the specific surface area, total pore volume, iodine value and saturated adsorption value of methyl orange reached their maximum values of 1 829.09 m2/g, 1.007 cm3/g, 1 984.85 mg/g and 217.87 mg/g, respectively and the yield of activated carbon was 41.73%. The adsorption process of methyl orange by activated carbon was highly correlated with Langmuir and Freundlich models (R2>0.99), and the adsorption kinetics was more consistent with the pseudo-second-order kinetic model.

Key words: gasified rice husk char, KOH method, specific surface area, activated carbon, methyl orange, adsorption

CLC Number: