| 摘要： |
The aim of this work was to explore the potential application of biochar from distillers' grains anaerobic digestion residue pyrolyzed at 700 degrees C (ADR-DG(700)) 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-DG(700) 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 maximumadsorption of 11.41 mgN g(-1). The NH4+ adsorption onADR-DG(700) 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-DG(700) could be a sorbent for NH4(+)(-)contaminated water as well as an inhibitor for soil NH4+ leaching. |
