以循环伏安法在优化条件下(pH=2.4,静止时间2s,扫速0.02 V/s)研究了铜离子在天然桃核粉上的吸附行为.天然核桃粉对铜离子具有吸附富集的作用,铜离子的吸附动力学遵循Langmuir吸附动力学模型,获得表观一级吸附动力学常数为0.268min-1.等温吸附曲线符合高斯分布曲线,遵循Freudlich等温吸附模型,获得吸附的参数为KF=41.7,n=1.82.在核桃粉吸附后,氧化峰的电流值明显降低,表明天然核桃粉对重金属离子具有很强的吸附富集能力.天然桃核粉是一种优质廉价的生物质吸附剂,其自身含有天然的微孔结构并且含有氨基、羧基和酚羟基、巯基等多种官能团能够与重金属离子形成络合键,适用于铜等重金属离子吸附富集.%The adsorption of Cu ( Ⅱ ) on natural peach stone power was studied by cyclic voltammetry under optimal conditions( pH2. 4, quiet time 2 s, scan rate 0. 02 V/s). The adsorption kinetics follows a Langmuir kinetic model with the apparent first order rate constant of 0. 268 min-1. The adsorption thermodynamics follows Freudlich adsorption model with a Gaussian function and paratemeters of KF = 41.7, n=1.82. The natural peach stone powder is one of the unique and cheap biosorbents to copper ion as well as other heavy metal ions, and itself contains the natural mieroporous structure and a variety of functional groups containing an amino group, a carbaxyl group and a phenolic hydroxyl group, a mercapto group which can farm a complexing bond, with a variety heavy metal ions, and suitable for the adsorption and reconcentration of heavy metal ions.
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