title: Sorption/Desorption Behavior and Mechanism of NH4(+) by Biochar as a Nitrogen Fertilizer Sustained-Release Material.
abstract: Biochar, the pyrolysis product of biomass material with limited oxygen, has the potential to increase crop production and sustained-release fertilizer, but the understanding of the reason for improving soil fertility is insufficient, especially the behavior and mechanism of ammonium sulfate. In this study, the sorption/desorption effect of NH4(+) by biochar deriving from common agricultural wastes under different preparation temperatures from 200 to 500 °C was studied and its mechanism was discussed. The results showed that biochar displayed excellent retention ability in holding NH4(+) above 90% after 21 days under 200 °C preparation temperature, and it can be deduced that the oxygen functional groups, such as carboxyl and keto group, played the primary role in adsorbing NH4(+) due to hydrogen bonding and electrostatic interaction. The sorption/desorption effect and mechanism were studied for providing an optional way to dispose of agricultural residues into biochar as a nitrogen fertilizer sustained-release material under suitable preparation temperature.
authors.affiliation: College of Food Sciences, South China University of Technology , 381 Wushan Road, Guangzhou 510640, China.
authors.forename: Yanxue
authors.initials: Y
authors.lastname: Cai
authors.affiliation: School of Materials Science and Engineering, Tianjin University , 92 Weijin Road, Nankai District, Tianjin 300072, China.
authors.forename: Hejinyan
authors.initials: H
authors.lastname: Qi
authors.affiliation: Department of Applied Chemistry, South China Agricultural University , 483 Wushan Road, Guangzhou 510642, China.
authors.forename: Yujia
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Food Sciences, South China University of Technology , 381 Wushan Road, Guangzhou 510640, China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: He
mesh_terms: D000327:Adsorption; D064751:Ammonium Compounds / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004339:Drug Compounding; D005308:Fertilizers / Q000032:analysis*; D009584:Nitrogen / Q000737:chemistry; D013696:Temperature
chemical_list: D064751:Ammonium Compounds; D003692:Delayed-Action Preparations; D005308:Fertilizers; C540010:biochar; D002606:Charcoal; D009584:Nitrogen
keywords: NH4+; biochar; desorption; interaction; sorption