Structural changes of aged biochar and the influence on phenanthrene adsorption

Biochars prepared by pyrolysis of rice husk at 350 degrees C and 550 degrees C were incubated in the lucifugal thermostat for 300 d. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), Scanning Electron Microscopy (SEM), and Nuclear Magnetic Resonance (NMR) techniques were applied...

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Published inHuanjing kexue Vol. 35; no. 7; p. 2604
Main Authors Tang, Wei, Guo, Yue, Wu, Jing-Gui, Huang, Zhao-Qin, Dai, Jing-Yu
Format Journal Article
LanguageChinese
Published China 01.07.2014
Subjects
Adsorption
Charcoal - chemistry
Incineration
Oxygen - chemistry
Phenanthrenes - chemistry
Spectroscopy, Fourier Transform Infrared
Temperature
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Summary:Biochars prepared by pyrolysis of rice husk at 350 degrees C and 550 degrees C were incubated in the lucifugal thermostat for 300 d. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), Scanning Electron Microscopy (SEM), and Nuclear Magnetic Resonance (NMR) techniques were applied to explore the structural change before and after incubation. It was found that the oxygen content was increased after incubation, suggesting the formation of oxygen-containing functional groups. Incubation of the biochars also enhanced their nonlinear adsorption of phenanthrene. Structural change subjected to incubation was in fact affected by the pyrolysis temperatures at which the biochars were synthesized. Increase of polarity and decrease of aromaticity were found for biochars prepared at 350 degrees C. In contrast, incubation of biochars prepared at 550 degrees C resulted in increased aliphatic contents and aromaticity, as well as decrease of carboxyl group. The adsorption capacity of phenanthrene predicted b
ISSN:0250-3301
DOI:10.13227/j.hjkx.2014.07.024