Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (11): 2872-2880.doi: 10.1016/j.cjche.2020.03.031

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

A high-performance biochar produced from bamboo pyrolysis with in-situ nitrogen doping and activation for adsorption of phenol and methylene blue

Zhenhao Li, Bo Xing, Yan Ding, Yunchao Li, Shurong Wang   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • Received:2020-01-23 Revised:2020-03-24 Online:2020-11-28 Published:2020-12-31
  • Contact: Yunchao Li
  • Supported by:
    This work was supported by the Innovative Research Groups of the National Natural Science Foundation of China (51621005) and China Postdoctoral Science Foundation (2019M652080).

Abstract: Nitrogen doping is a promising method for the preparation of functional carbon materials. In this study, a nitrogen-doped porous coral biochar was prepared by using bamboo as raw material, urea as nitrogen source, and KHCO3 as green activator through in-situ pyrolysis. The structure of the obtained biochar was characterized by various techniques including nitrogen adsorption and desorption, Raman spectroscopy, X-ray photoelectron spectrometer, and etc. The adsorption properties of nitrogen-doped biochar were evaluated with phenol and methylene blue probes. The results showed that the nitrogen source ratio had a significant effect on the evolution of pore structure of biochar. Low urea addition ratio was beneficial to the development of pore structures. The optimum specific surface area of nitrogen-doped biochar could be up to 1693 m2·g-1. Nitrogen doping can effectively improve the adsorption capacity of biochar to phenol and methylene blue. Biochar prepared at 973.15 K with low urea addition ratio exhibited the highest adsorption capacity for phenol and methylene blue, and the equilibrium adsorption capacity was 169.0 mg·g-1 and 499.3 mg·g-1, respectively. By comparing the adsorption capacity of various adsorbents in related fields, it is proved that the nitrogen-doped biochar prepared in this study has a good adsorption effect.

Key words: In-situ pyrolysis, Nitrogen doping, Green activator, Biochar, Adsorption