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Adsorption Characteristics and Mechanisms of Fe-Mn Oxide Modified Biochar for Pb(II) in Wastewater

Author

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  • Shang-Feng Tang

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

  • Hang Zhou

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
    Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China)

  • Wen-Tao Tan

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

  • Jun-Guo Huang

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

  • Peng Zeng

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
    Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China)

  • Jiao-Feng Gu

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
    Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China)

  • Bo-Han Liao

    (College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
    Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China)

Abstract

This study prepared iron-manganese oxide-modified biochar (FM-BC) by impregnating rice straw biochar (BC) with a mixed solution of ferric nitrate and potassium permanganate. The effects of pH, FM-BC dosage, interference of coexisting ions, adsorption time, incipient Pb(II) concentration, and temperature on the adsorption of Pb(II) by FM-BC were investigated. Moreover, the Pb(II) adsorption mechanism of FM-BC was analyzed using a series of characterization techniques. The results showed that the Fe-Mn oxide composite modification significantly promoted the physical and chemical functions of the biochar surface and the adsorption capacity of Pb(II). The specific surface area of FM-BC was 18.20 times larger than that of BC, and the maximum Pb(II) adsorption capacity reached 165.88 mg/g. Adsorption kinetic tests showed that the adsorption of Pb(II) by FM-BC was based on the pseudo-second-order kinetic model, which indicated that the adsorption process was mainly governed by chemical adsorption. The isothermal adsorption of Pb(II) by FM-BC conformed to the Langmuir model, indicating that the adsorption process was spontaneous and endothermic. Characterization analyses (Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy) showed that the adsorption mechanism of Pb(II) by FM-BC was mainly via electrostatic adsorption, chemical precipitation, complexation, ion exchange, and the transformation of Mn 2 O 3 into MnO 2 . Therefore, FM-BC is a promising adsorbent for Pb(II) removal from wastewater.

Suggested Citation

  • Shang-Feng Tang & Hang Zhou & Wen-Tao Tan & Jun-Guo Huang & Peng Zeng & Jiao-Feng Gu & Bo-Han Liao, 2022. "Adsorption Characteristics and Mechanisms of Fe-Mn Oxide Modified Biochar for Pb(II) in Wastewater," IJERPH, MDPI, vol. 19(14), pages 1-15, July.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:14:p:8420-:d:859468
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    References listed on IDEAS

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    1. Danious P. Sounthararajah & Paripurnanda Loganathan & Jaya Kandasamy & Saravanamuthu Vigneswaran, 2015. "Effects of Humic Acid and Suspended Solids on the Removal of Heavy Metals from Water by Adsorption onto Granular Activated Carbon," IJERPH, MDPI, vol. 12(9), pages 1-15, August.
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