Sorption of polycyclic aromatic hydrocarbons by biochars of wheat straw with different pyrolysis temperatures

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Ding, Zheng^1 ; Zhang, Fan^1 ; Sun, Ning^1 ; Chi, Jie^1

School of Environmental Science and Engineering, Tianjin University, Tianjin

300350, China^1

关键词: Aromaticities;    Brunauer emmett tellers;    Elemental compositions;    Fourier transform IR spectroscopy;    Pyrolysis temperature;    Sorption kinetics;    Sorption mechanism;    Total surface area;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/5/052008/pdf
DOI  :  10.1088/1755-1315/237/5/052008

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This study investigated the sorption kinetics of a model solute (phenanthrene and pyrene) with a series of biochars prepared from wheat straw at 100-700 °C (referred as BC100-BC700) to probe the effects of biochars produced at different pyrolysis temperatures on sorption of phenanthrene and pyrene. The samples were characterized by the elemental compositions, Fourier transform IR spectroscopy, and Brunauer-Emmett-Teller-N2 surface areas. The results showed that the sorption parameters (N and lgKf) are linearly related to sorbent aromaticity and the total surface areas, which increase with the pyrolysis temperature. Sorption mechanisms of biochars are evolved from partitioning-dominant at low pyrolysis temperatures to adsorption-dominant at higher pyrolysis temperatures.