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Adsorption Characteristics of Cd 2+ Ions in Aqueous Solution on Modified Straw Biochar

Author

Listed:
  • Bo Tang

    (School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
    State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China
    Shaanxi Province Key Laboratory of Catalytic Foundation and Application, Hanzhong 723001, China)

  • Haopu Xu

    (School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China)

  • Fengmin Song

    (School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
    State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China
    Shaanxi Province Key Laboratory of Catalytic Foundation and Application, Hanzhong 723001, China)

  • Zhifeng Liu

    (School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
    State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China
    Shaanxi Province Key Laboratory of Catalytic Foundation and Application, Hanzhong 723001, China)

Abstract

Rice straw and corn straw were selected as raw materials to prepare biocharby anoxic carbonization and the biochar was loaded on the surface with FeCl 3 , MnCl 2 and Fe(NO 3 ) 3 & KMnO 4 , respectively, and then two types of straw biochar and six types of modified biochar were prepared. FT-IR, SEM, and XRD were used to characterize and analyze the physical and chemical properties of the biochar. The adsorption kinetics and adsorption isothermal tests of Cd 2+ ions in aqueous solution were carried out. The results showed that modified biochars attached more active sites and surface group, especially iron-manganese-modified biochar (FMBC1, FMBC2). The kinetic adsorption tests showed that the adsorption process of eight kinds of biochar all conformed to the quasi-second-order kinetic equation, and chemisorption maybe dominated the adsorption process. The adsorption isothermal test showed that the adsorption process of Cd 2+ ions by FeCl 3 -modified biochar (FBC1, FBC2) and Fe(NO 3 ) 3 & KMnO 4 -modified biochar (FMBC1, FMBC2) conforms to the Freundlich model, and the adsorption process of Cd 2+ ions by MnCl 2 -modified biochar (MBC1, MBC2) conforms to Langmuir model. Compared with other kinds of biochar, the K F value of Fe(NO 3 ) 3 & KMnO 4 -modified biochar of rice straw biochar (FMBC1) was the largest, reached 18.602 L·mg −1 , and its 1/n value was the smallest, it reached 0.474, indicating that the adsorption effect on Cd 2+ of FMBC1 was the best.

Suggested Citation

  • Bo Tang & Haopu Xu & Fengmin Song & Zhifeng Liu, 2023. "Adsorption Characteristics of Cd 2+ Ions in Aqueous Solution on Modified Straw Biochar," Sustainability, MDPI, vol. 15(5), pages 1-12, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:5:p:4373-:d:1084286
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