|Title||129 Xe NMR Studies of Pecan Shell-Based Biochar and Structure-Process Correlations|
|Publication Type||Journal Article|
|Year of Publication||2014|
|Authors||Mauri, Michele, Farina Matteo, Patriarca Giorgio, Simonutti Roberto, Klasson Thomas K., and Cheng H. N.|
|Journal||International Journal of Polymer Analysis and Characterization|
Pecan shell-based biochar is being utilized as filtration medium, sequestrant for metallic ions, soil conditioner, and other applications. One process 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 2D NMR exchange experiments, the information on the exchange between free-versus-bound xenon was obtained. Furthermore, correlations of 129Xe NMR data with the carbonization process conditions were made.
|Short Title||International Journal of Polymer Analysis and Characterization|