Pecan shell-based biochar is utilized as a filtration medium, sequestrant for metallic ions, soil conditioner, and other applications. One process for creating the biochar involves the use of phosphoric acid at high temperature in a partial oxygen atmosphere to produce a highly porous carbonaceous material. In this work, we found 129Xe NMR to be an excellent technique to study micropores in biochar. Thus, the 129Xe chemical shift in biochar was found to vary linearly with the xenon pressure; from the data an estimate of about 8–9 Å could be proposed for the average pore diameter in pecan shell-based biochar. Through saturation recovery and 2-D NMR exchange experiments, information on the exchange between free versus bound xenon was obtained. Furthermore, correlations of 129Xe NMR data with the carbonization process conditions were made.

Mauri, M., Farina, M., Patriarca, G., Simonutti, R., Klasson, K., Cheng, H. (2015). 129Xe NMR Studies of Pecan Shell-Based Biochar and Structure-Process Correlations. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION, 20(2), 119-129 [10.1080/1023666X.2015.979038].

129Xe NMR Studies of Pecan Shell-Based Biochar and Structure-Process Correlations

Mauri, M
;
Farina, M;Patriarca, G;Simonutti, R;
2015

Abstract

Pecan shell-based biochar is utilized as a filtration medium, sequestrant for metallic ions, soil conditioner, and other applications. One process for creating the biochar involves the use of phosphoric acid at high temperature in a partial oxygen atmosphere to produce a highly porous carbonaceous material. In this work, we found 129Xe NMR to be an excellent technique to study micropores in biochar. Thus, the 129Xe chemical shift in biochar was found to vary linearly with the xenon pressure; from the data an estimate of about 8–9 Å could be proposed for the average pore diameter in pecan shell-based biochar. Through saturation recovery and 2-D NMR exchange experiments, information on the exchange between free versus bound xenon was obtained. Furthermore, correlations of 129Xe NMR data with the carbonization process conditions were made.
Articolo in rivista - Articolo scientifico
129; Xe NMR; Activated carbon; Agricultural by-products; Biochar; Pecan shells;
NMR, Xenon, Biochar
English
2015
20
2
119
129
none
Mauri, M., Farina, M., Patriarca, G., Simonutti, R., Klasson, K., Cheng, H. (2015). 129Xe NMR Studies of Pecan Shell-Based Biochar and Structure-Process Correlations. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION, 20(2), 119-129 [10.1080/1023666X.2015.979038].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/67752
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