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首页> 外文期刊>Advances in Research >Kinetic and Isothermal Studies for Removal of Zn (II) Ions from Aqueous Solutions by Using Lawsonia inermis as a Novel Biosorbent
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Kinetic and Isothermal Studies for Removal of Zn (II) Ions from Aqueous Solutions by Using Lawsonia inermis as a Novel Biosorbent

机译：动力学和等温研究使用无水Lawsonia作为新型生物吸附剂从水溶液中去除Zn（II）离子

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摘要

In this work, the use of a cost-effective biosorbent Lawsonia inermis was investigated for removal of Zn (II) ions from aqueous solutions. Different operational parameters such as the effect of pH, biomass dose, equilibrium time, temperature and initial metal ion concentrations were studied. Maximum adsorption of Zn (II) took place at optimum conditions of pH 5.0 and biomass dose of 0.2 g/L. It was found that the interactions between zinc ions and Lawsonia inermis were complicated, and the pH of solution was a key governing factor of such interactions. Biosorption equilibrium was achieved in 60 minutes. The adsorption kinetics followed Pseudo second order kinetic model and the value of rate constant was found to be 1.23 × 10-2 g mg-1min-1. Fourier transform infrared (FTIR) spectroscopy was used to characterize the surface functional groups of the biosorbent. FTIR analysis was used to reveal the involvement of hydroxyl and carboxyl groups in the removal of Zn (II) from aqueous streams. Linear Langmuir and Freundlich models were applied to describe the equilibrium isotherms, and both of the two models were synchronic. The Langmuir adsorption capacity (qm) was found to be 76.92 mg g-1. Desorption experiments indicated that 0.5 M HCl was efficient desorbent for the recovery of Zn (II) from biomass. All the experimental facts reveal the efficiency of Lawsonia inermis based Zn (II) removal technology.
机译：在这项工作中，研究了使用具有成本效益的生物吸附剂无定律Lawsonia inermis从水溶液中去除Zn（II）离子。研究了不同的操作参数，例如pH值，生物质剂量，平衡时间，温度和初始金属离子浓度的影响。锌（II）的最大吸附发生在pH 5.0和0.2 g / L的最佳生物量条件下。结果发现，锌离子与无定律之间的相互作用复杂，溶液的pH值是影响这种相互作用的关键因素。 60分钟内达到生物吸附平衡。吸附动力学遵循伪二级动力学模型，速率常数值为1.23×10 -2 g mg -1 min -1 。傅里叶变换红外（FTIR）光谱用于表征生物吸附剂的表面官能团。 FTIR分析用于揭示羟基和羧基参与从水流中去除Zn（II）的过程。线性Langmuir模型和Freundlich模型用于描述平衡等温线，并且两个模型都是同步的。朗格缪尔的吸附容量（q m ）为76.92 mg g -1 。解吸实验表明0.5 M HCl是从生物质中回收锌（II）的有效解吸剂。所有的实验事实都显示了基于无毛劳森氏菌的Zn（II）去除技术的效率。

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