Bioavailability of zinc (Zn) can be estimated by desorption
in
sandy loam soil for sustainable nutrient delivery technology by nutrient
carriers. While being renewable and biodegradable in nature, wood
derivatives have a high potential to offer numerous benefits of a
hierarchical pore network, mechanical stability, and facile adsorption–desorption
properties. High-altitude wood offers higher wood density that forms
carbon frameworks with rich and indefinite numbers of open and low-tortuosity
cavities decorated with longer tube-like channels which facilitate
infiltration of nutrient ions via permeation. Wood-derived carbon
frameworks with longer tube-like channels can facilitate zinc salt
(ZnSO4·7H2O) permeation for adsorption–desorption
kinetics of Zn-nutrient release and flow in a model system. The wood-derived
carbon framework of an ultrathick porous nature with long channels
was developed by thermal pretreating to access to carbon-wood (CW)
followed by carbonization to obtain CW-HCN to increase the active
site of Zn-salt adsorption. The CW framework was dipped into a metal
salt precursor solution of FeCl2 (anhydrous) or (FeCl2 + ZnCl2) followed by drying, which allowed rapid
self-assembling of metal salts in a CW framework while allowing exposure
to a heat-pulse treatment during pyrolysis. The desorption characteristics
of Zn were analyzed from rapid initial desorption until equilibration
in 8 h, and thereafter a slow-release rate was noticed.
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