Optimization of preparation of peanut shell biochar by response surface methodology and its adsorption of Cr(Ⅵ)in water

doi:10.3969/j.issn.1000-1565.2022.04.008

Abstract

Abstract: In order to explore the removal effect of biomass charcoal on heavy metal ions, a preparation conditions of the optimal biomass carbon were obtained by response surface optimization method well using peanut shell as raw material and ZnCl₂ as modifier. In addition, the effects of different single factors on the adsorption of Cr(Ⅵ)in water by peanut shell biomass carbon were studied. The results showed that the optimum preparation conditions of peanut shell biochar were as follows: ZnCl₂ modifier concentration as 4 mol/L, carbon burning temperature as 500 ℃, carbon burning time as 3 h. The single factor experiment showed that the optimum reaction condition was pH=2 and dosage=50 mg. At this time, the adsorption rate can reach to 93.72%, and the higher the temperature resulted the more conducive to adsorption. The isothermal adsorption experiment conforms to the Langmuir model, which showed that the adsorption process was dominated by monolayer adsorption, which belongs to endothermic reaction. The kinetics accorded with the quasi second order equation, indicating that the adsorption process was mainly chemisorption.

Key words: response surface methodology, peanut shell, ZnCl₂, modified biochar, Cr(Ⅵ)

CLC Number:

DENG Tiantian,LI Hansheng, MA Pei, XU Mengxing, YE Zixin, ZHAI Liping. Optimization of preparation of peanut shell biochar by response surface methodology and its adsorption of Cr(Ⅵ)in water[J]. Journal of Hebei University(Natural Science Edition), 2022, 42(4): 384-394.

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