Sorption of Phosphate on Douglas Fir Biochar Treated with Magnesium Chloride and Potassium Hydroxide for Soil Amendments
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Date
2023-01-19
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI Processes
Abstract
With increasing climate variability, a sustainable crop production approach remains an
indispensable concern across the globe. In this study, P retention/availability of MgCl2.6H2O/KOH
modified Douglas fir biochar was assessed. The MgCl2·6H2O/KOH treated Douglas fir biochar was
prepared by sequentially treating Douglas fir biochar with magnesium chloride and potassium hy droxide solutions. The biochar’s surface area, pore volume, morphology, and elemental composi tions were determined using BET, SEM, SEM/EDS, and powder X-ray analyzes. Both surface area
and pore volume were reduced by more than 97% following modification. Similarly, the morphol ogy and elemental compositions changed after modification. The maximum P adsorbed correspond ing to Langmuir–Freundlich model was 41.18 mg g−1
. P sorption on biochar soil mixture was pH
dependent. More studies are required to establish the field applicability of P-laden MgCl2
·6H2O/KOH-modified Douglas fir biochar as a soil additive.
Description
This research received no external funding
Keywords
Modified biochar, soil pH, P retention, P availability
Citation
Arwenyo, B.; Navarathna, C.; Das, N.K.; Hitt, A.; Mlsna, T. Sorption of Phosphate on Douglas Fir Biochar Treated with Magnesium Chloride and Potassium Hydroxide for Soil Amendments. Processes 2023, 11, 331. https://doi.org/10.3390/pr11020331