Adsorption of NPK fertiliser and humic acid on palm kernel shell biochar


Citation

Uttran A., . and Loh S.K., . and Kong S.H., . and Bachmann R. T., . Adsorption of NPK fertiliser and humic acid on palm kernel shell biochar. pp. 472-484. ISSN 1511-2780

Abstract

To date no study has been reported on adsorption capacity (Qe) of palm kernel shell (PKS) biochar for plant nutrients NO3 - NH 4 PO4 3- and K (NPK) while most biochar adsorption investigations have not considered the effect of dissolved soil organic matter e.g. humic acid (HA). In our study we produced PKS biochar at different temperatures and holding times and conducted sorption experiments with a commercial NPK fertiliser and HA. HA-coated PKS biochar was investigated for its capability in adsorbing NPK. Equilibrium adsorption experiments showed that NH 4 and HA were adsorbed with no effect for NO3 “ and PO4 3- while K concentration in solution increased exponentially over time. The highest Qe of NH 4 (0.522 0.036 mg g-1; p0.05) and that of HA (0.649 0.073 mg g-1) were observed for 400C PKS biochar. The best-fitted HA sorption with Freundlich isotherm (R2 0.904) reveals a heterogeneous surface and arguably multiple layer sorption of HA. A 55.9 reduction in Qe of NH4 for HA-coated 600C PKS biochar suggests that performances observed in the laboratory cannot be directly extrapolated to the field. Furthermore a realistic mechanistic understanding of PKS biochar sorption efficiency on NPK associated with soil matrix components such as humic substances microorganisms and colloidal clay particles is essential.


Download File

Full text available from:

Abstract

To date no study has been reported on adsorption capacity (Qe) of palm kernel shell (PKS) biochar for plant nutrients NO3 - NH 4 PO4 3- and K (NPK) while most biochar adsorption investigations have not considered the effect of dissolved soil organic matter e.g. humic acid (HA). In our study we produced PKS biochar at different temperatures and holding times and conducted sorption experiments with a commercial NPK fertiliser and HA. HA-coated PKS biochar was investigated for its capability in adsorbing NPK. Equilibrium adsorption experiments showed that NH 4 and HA were adsorbed with no effect for NO3 “ and PO4 3- while K concentration in solution increased exponentially over time. The highest Qe of NH 4 (0.522 0.036 mg g-1; p0.05) and that of HA (0.649 0.073 mg g-1) were observed for 400C PKS biochar. The best-fitted HA sorption with Freundlich isotherm (R2 0.904) reveals a heterogeneous surface and arguably multiple layer sorption of HA. A 55.9 reduction in Qe of NH4 for HA-coated 600C PKS biochar suggests that performances observed in the laboratory cannot be directly extrapolated to the field. Furthermore a realistic mechanistic understanding of PKS biochar sorption efficiency on NPK associated with soil matrix components such as humic substances microorganisms and colloidal clay particles is essential.

Additional Metadata

[error in script]
Item Type: Article
AGROVOC Term: Palm kernels
AGROVOC Term: Chars
AGROVOC Term: Npk fertilizers
AGROVOC Term: Oil palm
AGROVOC Term: Humic acids
AGROVOC Term: Biomass
AGROVOC Term: Pyrolysis
AGROVOC Term: Adsorption
AGROVOC Term: Analysis of variance
AGROVOC Term: Micronutrient fertilizers
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 24 Apr 2025 06:29
URI: http://webagris.upm.edu.my/id/eprint/24704

Actions (login required)

View Item View Item