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 E-mail:yumoxin2005@aliyun.com
  • Supported by:
    Supported by the China Postdoctoral Science Foundation(2019M652173);the National Natural Science Foundation of China(51602004)

Abstract:

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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