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

Shang-Feng Tang, Hang Zhou, Wen-Tao Tan, Jun-Guo Huang, Peng Zeng, Jiao-Feng Gu and Bo-Han Liao
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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
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
Jiao-Feng Gu: College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Bo-Han Liao: College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China

IJERPH, 2022, vol. 19, issue 14, 1-15

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.

Keywords: Fe-Mn oxide composite; biochar; wastewater; lead; adsorption mechanism (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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