Abstract
The Eichhornia crassipes roots for the removal of Pb (II) ions from aqueous solutions has been investigated. The adsorption of Pb (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 Freundlich isotherm as evidenced by a higher correlation coefficient (R 2 ). The biosorption capacity for E. crasippes was found to be 16.350 mg g-1. 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.
Highlights
Heavy metals in water have been a major preoccupation for researchers for many years due to their toxicity towards aquatic life, human beings and environment [1]
Hydrogen ion concentration is one of the important factors that influence the adsorption behavior of metal ions in aqueous solutions. It affects the solubility of metal ions in solution, replaces some of the positive ions found in active sites and affects the degree of ionization of the adsorbate during the process of biosorption
This is because it affects solution chemistry and the speciation of the metal ions
Summary
Heavy metals in water have been a major preoccupation for researchers for many years due to their toxicity towards aquatic life, human beings and environment [1]. This is because they do not biodegrade unlike organic pollutants, making their presence in industrial effluents and drinking water a public health concern [2]. Several materials have been investigated for removal of heavy metals from water and waste waters This includes heartwood powder of Areca catechu [8, 9, 10, 11]
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