Mariana Coelho Santoro – @marianacsantoro
This work describes a solid-state 31P NMR investigation of the chemical nature of adsorbed phosphate groups in Ca/Mg modified biochars. Biomass was used to synthesise steam-activated biochars, followed by precipitation of Ca or Mg metals for later adsorption of phosphates from phosphate-rich solutions, aiming the obtention of a material with bioavailable phosphate forms to be used as slow-release fertilisers. The 31P NMR results showed that the Mg/modified biochars had a higher phosphate adsorption capacity. Also, signals with distinct chemical shifts and linewidths were observed in the spectra of samples immersed in different phosphate solutions.
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