Accessing the potential of Lonchocarpus laxiflorus roots (LLR) plant biomass to remove Cadmium (II) ions from aqueous solutions: Equilibrium and kinetic studies

African Journal of Pure and Applied Chemistry Pub Date : 2015-05-31 DOI:10.5897/AJPAC2015.0620

H Santuraki A, A Muazu A

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引用次数: 7

Abstract

The potential of Lonchocarpus laxiflorus roots (LLR) for the removal of Cd (II) ions from aqueous solutions has been investigated. The adsorption of Cd (II) ions was found to be affected by solution pH, contact time, adsorbent dosage, initial metal ion concentration, and temperature. The equilibrium was analysed using Langmuir and Freundlich isotherm models. The data was found to have a closer correlation with the Lamgmur isotherm as evidenced by a higher correlation coefficient (R2). The adsorption capacity for L. laxiflorus was found to be 19.35 mg g-1 and the removal efficiency of the LLR was found to be 98% under optimized conditions. The kinetics data was also subjected to pseudo-first-order and the pseudo-second-order kinetic models. The data could be explained better using the pseudo-second-order kinetic model. The selected biosorbent has been analyzed by FT-IR for identification of contributing functional groups, x-ray powder diffraction (XRD) for its structural properties and scanning electron microscope (SEM) for the structural morphology analysis. Key words: Biosorption, cadmium, isotherms, kinetics, Lonchocarpus laxiflorus.

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利用长尾根(LLR)植物生物量去除水溶液中镉(II)离子的潜力:平衡和动力学研究

研究了长叶草根(LLR)对Cd (II)离子的去除率。吸附Cd (II)离子受溶液pH、接触时间、吸附剂用量、初始金属离子浓度和温度的影响。用Langmuir和Freundlich等温模型分析了平衡。数据与lammur等温线的相关系数(R2)较高，相关性更强。在优化条件下，LLR对草芽孢杆菌的吸附量为19.35 mg g-1，去除率为98%。动力学数据也适用于伪一阶和伪二阶动力学模型。用拟二阶动力学模型可以更好地解释这些数据。采用傅里叶变换红外光谱(FT-IR)、x射线粉末衍射(XRD)和扫描电子显微镜(SEM)对所选生物吸附剂进行结构形貌分析。关键词:生物吸附;镉;等温线;

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African Journal of Pure and Applied Chemistry

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