【摘要】 针对污水中磷酸盐的处理问题,制备了一种新型的棕榈纤维生物炭负载的纳米零价铁复合材料(nZVI-PB),用于对水体中磷酸盐的高效吸附。结果表明nZVI-PB对磷酸盐具有较好的吸附能力(309.0mgP/g),该吸附反应为放热过程,符合准二级动力学模型和Freundlich模型,吸附机制为化学吸附。溶液的初始pH对磷的吸附影响较大,随着pH的增加,吸附量明显下降,离子强度的增加会提高nZVI-PB的吸磷能力。利用SEM、XRD等手段对nZVI-PB的微观结构进行表征表明,磷酸盐的吸附机理主要包括化学吸附和配位基交换作用。更多还原

【Abstract】 To deal with the phosphate pollution in surface water,a new type of palm fiber biochar-supported nano-zero-valent iron composite(nZVI-PB) was prepared in this study to achieve efficient adsorption of phosphate.Results showed that nZVI-PB was effective for phosphate removal from queous solution(309.0 mgP/g).It was an exohermic reaction and the quasi-second order kinetic model and Freundlich model fitted the phosphate kinetic experimental date well.The adsorption effect of phasphate on nZVI-PB relied on pH,the amount of adsorption decreases significantly as the pH increases.The increase in ionic strength would increase the phosphorus absorption capacity of nZVI-PB.Characterization of nZVI-PB by using SEM and XRD showed that the adsortion mechanisn of phosphate on the nZVI-PB mainly included the electrostatic attraction and ligand exchange interaction.更多还原