硫改性牛粪生物炭对Hg<sup>2+</sup>的高效吸附及其机理

张奎; 王雪梅; 李玉环; 张瑜; 刘梦娟; 蒋雪萍; 季宏兵

doi:10.13205/j.hjgc.202204012

硫改性牛粪生物炭对Hg²⁺的高效吸附及其机理

doi: 10.13205/j.hjgc.202204012

1. 北京科技大学能源与环境工程学院, 北京 100083;
2. 首都师范大学资源环境与旅游学院, 北京 100048

基金项目:

国家自然科学基金(41473122)

国家重点研发计划(2019YFC0408700)

中央高校基础科研项目(FRF-TP-19-020A1)

详细信息

作者简介:
张奎(1997-),男,硕士,主要研究方向为重金属污染修复。zhangkui@163.com

通讯作者:
季宏兵(1966-),男,教授,主要研究方向为环境地球化学。ji.hongbing@hotmail.com

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- 文章访问数: 154
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-06
- 网络出版日期: 2022-07-06

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

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

摘要

摘要: 以牛粪为原料在400,500,600 ℃条件下限氧热解制备牛粪生物炭(BC),然后以不同质量比将升华硫和BC混合共热解制备硫改性牛粪生物炭(BCS)。使用元素分析仪、SEM、FTIR、XPS和BET对制得的BC和BCS进行了表征,并研究了各BC和BCS对Hg²⁺的吸附特性。结果表明:热解过程使BC和BCS变得粗糙多孔,Hg²⁺被吸附到生物炭表面和孔道内;BC和BCS的吸附过程符合准二级动力学模型,BCS对Hg²⁺的吸附平衡时间仅为30 min,且吸附过程不受pH影响;Langmuir模型可较好地描述BC吸附过程,吸附量随热解温度的升高而降低,BCS吸附过程符合Freundlich模型,吸附能力较BC显著提升,最大拟合吸附量达到407.81 mg/g;BCS的吸附稳定性较高,在各解吸剂中的解吸率均低于5%;BC主要吸附机理为官能团络合,BCS主要吸附机理为HgS沉淀。因此BCS是一种高效稳定的Hg²⁺吸附材料。
- 牛粪生物炭 /
- 硫改性 /
- 汞 /
- 吸附 /
- 机理
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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