The aim of this work was to explore the potential application of biochar from distillers’ grains anaerobic digestion residue pyrolyzed at 700 °C (ADR-DG700) to ammonium (NH4 +) adsorption from aqueous solution, as well as its effect on NH4 + leaching from an Ultisol. The adsorption kinetic of NH4 + on the ADR-DG700 could be described by an Elovich model (R 2 = 0.995), and the combined Langmuir-Freundlich model (R 2 = 0.997) fitted the isotherm data better than the Langmuir, Freundlich, Redlich-Peterson, and Temkin models with a maximum adsorption of 11.41 mg N g−1. The NH4 + adsorption on ADR-DG700 was mainly controlled by the cation exchange, the surface complexation with oxygen-containing functional groups of carboxyl C〓O (C▬O) and carbohydrate C▬OH, as well as the electrostatic interactions with Si▬O▬Si functional group. In addition, the ADR-DG700 soil application reduced 2.48–20.67% of NH4 +-N leaching loss after nitrogen fertilizer application in an Ultisol. These results suggested that the ADR-DG700 could be a sorbent for NH4 +-contaminated water as well as an inhibitor for soil NH4 + leaching.
Environmental Science and Pollution Research – Springer Journals
Published: Mar 11, 2018
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