The "Terras Pretas de índio" (TPI) also called Dark Earth, are soils know wordwide for your fertile proprieties. Several research has tried to develop materials to mimic the TPI from biomass sources. Pirolitic process is the most utilized to produced biochar, but one disadvantage in this process is the Polycyclic Aromatic Hydrocarbons (PAH) compounds formation. The Hydrothermal Carbonization (HTC) process not require the previous biomass drying and produces rich carbon material called hydrochar that seems have similar structural and morphological characteristics to TPI. For this the humic substances characterization is important approach to assess the similarity between TPI and hydrochar. The humic substances (HS) are complex misture of heterogeneous compounds, originating from the decomposition of animal and plant litter in diferente stages of decomposition. The research group, CERMANU (NMR Research Centre for Agriculture, Food, Environment and Innovative Materials) in the University Federico II, has proposed advanced methods to study the humic structures, reducing their complexity by the sequential humeonic fractionation that consists of the breakdown of inter-interaction and the extracts can be analyzed by combinations of analytical techniques such as thermochemolyses, GC-MS and NMR, and the results allows the unveiling the humic composition of the materials. The aim of this study is the structural characterization of humic substances of TPI soils and hydrochars produced under different conditions, to evaluate the similarity of hydrochar with TPI by sequential humeonic fractionation with the supervision the professor Riccardo Spaccini.
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