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首页> 外文期刊>Clean >Kinetics, Mechanistic and Thermodynamics of Zn(Ⅱ) Ion Sorption: A Modeling Approach
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Kinetics, Mechanistic and Thermodynamics of Zn(Ⅱ) Ion Sorption: A Modeling Approach

机译：Zn（Ⅱ）离子吸附的动力学，机理和热力学：一种建模方法

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Biosorption potential of Cedrus deodara sawdust (CDS) in terms of sorption of Zn(Ⅱ) ion across liquid phase has been evaluated in the present investigation. The surface of the CDS biomass before the sorption of Zn(Ⅱ) ions seemed to be more porous, non-crystalline and heterogeneous. The maximum uptake capacity of CDS was 97.39mg g~(-1). Sorption of Zn(Ⅱ) ion on the surface of CDS sawdust was maximum at pH 5, temperature 45℃, initial concentration of Zn(Ⅱ) ion 100 mg L~(-1), biomass dose 1 g L~(-1), contact time 150 min, and agitation rate 160 rpm. Pseudo second-order kinetics with the highest linear regression coefficient (R~2 = 0.99), and lowest values of error functions, i.e., chi (χ~2) and sum of square errors (SSE) against pseudo first-order rate kinetics showed that the sorption of Zn(Ⅱ) ion on the surface of CDS was mediated by chemosoprtive forces of attraction rather than physical adsorption. Mechanistically, relatively higher proportion of sorption of Zn(Ⅱ) ion in early phase of contact time was profoundly explained by Bangham's equation and film diffusivity (D~f). Intraparticle or pore diffusion (D_p) of Zn(Ⅱ) ion inside the pores of CDS was rate limiting step at the later stage of contact time. Furthermore, the thermodynamic study on sorption of metal ion delineated the fact that the Zn(Ⅱ) sorption on the surface of CDS was spontaneous, endothermic together with increased entropy at solid liquid interface.
机译：在本研究中，已经评估了雪松木屑（CDS）在整个液相中对Zn（Ⅱ）离子的吸附潜力。吸附Zn（Ⅱ）离子之前的CDS生物量表面似乎是多孔的，非晶态的和非均质的。 CDS最大吸收量为97.39mg g〜（-1）。 pH 5，温度45℃，初始浓度Zn（Ⅱ）离子100 mg L〜（-1），生物量1 g L〜（-1）时，CDS锯末表面的Zn（Ⅱ）离子吸附最大。 ，接触时间为150分钟，搅拌速度为160 rpm。具有最高线性回归系数（R〜2 = 0.99）且误差函数的最小值（即chi（χ〜2）和平方误差总和（SSE））的伪二阶动力学相对于伪一阶速率动力学表现出Zn（Ⅱ）离子在CDS表面的吸附是由化学吸附力而不是物理吸附介导的。从机理上讲，Bangham方程和膜扩散率（D〜f）深刻地解释了接触时间早期相对较高比例的Zn（Ⅱ）离子的吸附。在接触时间的后期，CDS孔内Zn（Ⅱ）离子的颗粒内或孔扩散（D_p）是限速步骤。此外，对金属离子吸附的热力学研究表明，CDS表面的Zn（Ⅱ）吸附是自发的，吸热的，并且在固液界面处熵增加。

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