Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (11): 2464-2472.doi: 10.7503/cjcu20200449

• Physical Chemistry • Previous Articles     Next Articles

Preparation of High Oxygen Porous Carbon from Walnut Peel and Its Adsorption Properties for Ni2+

YU Jianxing1, YU Moxin1,2(), KUAI Le1, ZHU Bowen1   

  1. 1.School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma'anshan 234000,China
    2.Sinosteel New Materials Co. ,Ltd. ,Ma'anshan 234000,China
  • Received:2020-07-14 Online:2020-11-10 Published:2020-11-06
  • Contact: YU Moxin
  • Supported by:
    Supported by the China Postdoctoral Science Foundation(2019M652173);the National Natural Science Foundation of China(51602004)


The hierarchical biomass carbon(HBCx) was obtained from walnut green peel,which was first prepared by hydrothermal method, and then activated at different temperatures. The as-made HBCx was characterized by SEM, FTIR, BET and XPS, and its application for adsorption of high or low concentration Ni2+ originated from batteries waste water was investigated. The SEM and BET results show that a large number of macropores(about 2 μm) are uniformly distributed on HBCx. HBCx has a hierarchical porous structure. When the activation temperature is 800 ℃, the specific surface area of the obtained HBC800 is 94 m2/g with the average pore diameter of 4.07 nm. The results of FTIR and XPS show that the surface of carbon materials is rich in oxygen and nitrogen-containing functional groups, and the oxygen content is as high as 21.24%(molar fraction), which can be ion exchanged or co-precipitated with Ni2+. These groups are beneficial to the adsorption process. The prepared porous carbon has a removal rate of close to 100% for low-concentration Ni2+ in the waste liquid, showing excellent adsorption performance.The Langmuir model fits well with the adsorption isotherm of Ni2+ on HBCx, which demonstrated the adsorption is monolayer. The maximum adsorption capacity of Ni2+ on HBC800 is up to 127.39 mg/g. The quasi-second-order kinetic model can describe the adsorption process better. The adsorption rate is mainly controlled by chemical adsorption. Fixed-bed adsorption result shows that the HBCx is a promising material which can be used in industry widely.

Key words: Walnut green peel, Porous carbon, High oxygen content, Ni2+, Chemical adsorption

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