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Journal of University of Chinese Academy of Sciences ›› 2021, Vol. 38 ›› Issue (2): 217-227.DOI: 10.7523/j.issn.2095-6134.2021.02.008

• Research Articles • Previous Articles     Next Articles

Preparation of grape peel based biochar by orthogonal design and its adsorption performance

CHANG Chun1,2,3, BAI Yang1, SONG Xinyi1, SHAN Shuang1, LI Mingzhe1   

  1. 1. College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, Liaoning, China;
    2. Institute of Ocean Research, Bohai University, Jinzhou 121013, Liaoning, China;
    3. Professional Technology Innovation Center of Liaoning Province for Conversion Materials of Solar Cell, Bohai University, Jinzhou 121013, Liaoning, China
  • Received:2019-06-27 Revised:2019-09-16 Online:2021-03-15

Abstract: The biochar was prepared by the limited oxygen pyrolysis method using agricultural waste grape peel as raw materials. The best activation conditions were selected for activated biochar through the orthogonal test table of three factors and three levels, and the activated biochar was obtained for adsorption experiment. The effects of initial concentration of reactants, reaction temperature and contact time on adsorption were investigated and analyzed through batch experiments. According to the kinetic fitting results, it could be concluded that the adsorption process of grape peel-based biochar on methyl orange could be well described by the quasi-second-order kinetic equation. It indicated that the adsorption process of activated biochar on methyl orange was not a single monolayer adsorption process. The intraparticle diffusion equation showed that intraparticle diffusion was not the only limiting factor, and the adsorption process was controlled by two processes:liquid film diffusion and intraparticle diffusion. The two-chamber model showed that the fast adsorption reaction played a leading role in the whole adsorption process. The adsorption of methyl orange by activated biochar was well fitted by Temkin-Pyzhev model, which showed that the adsorption of methyl orange by activated carbon was more prone to irregular surface adsorption. The adsorption thermodynamic data proved that adsorption reaction was easy to occur.

Key words: grape peel, orthogonal test, hydrothermal reaction, adsorptive performance, biochar

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