Effect of Wood-Derived Porous Carbon Framework on Zinc Adsorption–Desorption Kinetics for Nutrient Flow

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 center dot 7H(2)O) 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 la, and thereafter a slow-release rate was noticed.