HIGH EFFICIENCY ADSORPTION OF Hg<sup>2+</sup> BY SULFUR-MODIFIED COW MANURE BIOCHAR AND ITS MECHANISM

ZHANG Kui; WANG Xuemei; LI Yuhuan; ZHANG Yu; LIU Mengjuan; JIANG Xueping; JI Hongbing

doi:10.13205/j.hjgc.202204012

Volume 40 Issue 4

Apr. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(4): 79-88

ZHANG Kui, WANG Xuemei, LI Yuhuan, ZHANG Yu, LIU Mengjuan, JIANG Xueping, JI Hongbing. HIGH EFFICIENCY ADSORPTION OF Hg2+ BY SULFUR-MODIFIED COW MANURE BIOCHAR AND ITS MECHANISM[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 79-88. doi: 10.13205/j.hjgc.202204012

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ZHANG Kui, WANG Xuemei, LI Yuhuan, ZHANG Yu, LIU Mengjuan, JIANG Xueping, JI Hongbing. HIGH EFFICIENCY ADSORPTION OF Hg²⁺ BY SULFUR-MODIFIED COW MANURE BIOCHAR AND ITS MECHANISM[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 79-88. doi: 10.13205/j.hjgc.202204012

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HIGH EFFICIENCY ADSORPTION OF Hg²⁺ BY SULFUR-MODIFIED COW MANURE BIOCHAR AND ITS MECHANISM

doi: 10.13205/j.hjgc.202204012

1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China

Received Date: 2021-08-06
Available Online: 2022-07-06

Abstract

Abstract

Cow manure biochar (BC) were prepared by low-limit oxygen pyrolysis of cow manure at 400 ℃, 500 ℃ and 600 ℃, and then sulfur-modified cow manure biochar (BCS) were prepared by co-pyrolysis of sublimated sulfur and BC at different mass ratios. The BC and BCS were characterized by elemental analyzer, SEM, FTIR, XPS and BET, and the adsorption characteristics of each BC and BCS sample for Hg²⁺ were studied. The results showed that with the increase of pyrolysis temperature, BC and BCS became coarse and porous, and Hg²⁺ was adsorbed on the surface and pore of biochar. Kinetic experiments showed that the adsorption process of BC and BCS could be better described by the pseudo-second-order model than the pseudo-first-order model. The equilibrium time of BCS for Hg²⁺ adsorption was only 30 min, and the adsorption process was not affected by pH. The results of isothermal experiments showed that Langmuir model could better describe the adsorption process of BC, and the adsorption capacity decreased when increasing pyrolysis temperature. The isothermal adsorption of BCS to Hg²⁺ conformed to the Freundlich equation, the adsorption capacity of BCS was significantly higher than BC, and the maximum adsorption capacity was 407.81 mg/g. The desorption experiments showed that the adsorption stability of BCS was higher than BC, and the desorption rate was lower than 5% in each desorption agent. The results of FTIR and XPS showed that the main adsorption mechanisms of BC and BCS were functional group complexation and HgS precipitation, respectively. Therefore, BCS is a highly efficient and stable mercury adsorption material.
- cow manure biochar,
- sulfur modified,
- mercury,
- adsorption,
- mechanism

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References(42)

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