| Abstrak/Abstract |
Solid hydrolysate and biochar 2:1 are synthetic humus from hydrothermal
carbonization of chicken feather waste and contain humin that can be isolated by IHSS
method. The recalcitrant humin is obtained in solid form. The yield of isolated humin
from biochar 2:1 was 44.5%, and humin from solid hydrolysate was 12.7%. Analysis of
humin by FTIR indicated the characteristics of complex functional groups. Based on the
XRD and TEM tests, humin is formed from amorphous crystals with <14 nm in size and
categorized as a superparamagnetic nanoparticle. The surface morphology of humin
from solid hydrolysate is in the form of small spheres attached to larger particles, while
humin from biochar 2:1 is smoother and has a larger surface area. This synthetic humin
contains the nutrients N, O, Si, Cu, S, Mg, Zn, and K based on the EDX test
quantitatively supported by AAS analysis. Characteristics of humin, which contains
nutrients, are composed of amorphous crystals with complex functional groups during
the hydrothermal carbonization process. Their relatively small heterogeneous molecules
are stabilized by hydrophobic interactions and hydrogen bonds to form supramolecular
compound associations in hour order. This humin content in synthetic humus is
expected to increase its utility as a soil improver. |
