Tamarix aphylla Biomass as Efficient Adsorbent for Removal of Pb(II) Ions from Aqueous Solution: Kinetic and Applicability for Different Isotherm Models

Abstract

T AMARIXAPHYLLA biomass (TAB) is a low cost adsorbent that has been used for the removal of Pb(II) ions from an aqueous solution. It was characterized by Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) to support the adsorption of Pb(II) ions. The ability of TAB to adsorb Pb(II) ions was investigated by using batch adsorption procedure. The effects of various parameters such as solution pH, adsorbent concentration, contact time and initial Pb(II) ions concentration were examined. The adsorbent data were analyzed using two, three, four and five parameter models at 30 o C by using nonlinear regression analysis.Various kinetic models including the Pseudo-first-order, Pseudo-second-order, Elovich, Intra-particle diffusion and Bangham models have been applied to the experimental data to predict the adsorption mechanism. It was found that pseudo-second-order rate was better obeyed than pseudo-first-order reaction supporting that chemisorption process was involved. The examination of error analysis methods showed that the Langmuir model provide the best fit for experimental data than other isotherms. The obtained results show that TAB can be used as an effective and a natural low-cost adsorbent for the removal of Pb(II) ions from aqueous solutions.

Enhancement adsorption of lead and cadmium ions from waste solutions using chemically modified palm fibers

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Nano-chamomile waste as a low-cost biosorbent for rapid removal of heavy metal ions from natural water samples

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“…The Langmuir model assumes that adsorption occurs with a mono-molecular layer arrangement onto a completely homogeneous surface and the interactions between the adsorbed molecules are negligible. The simple Langmuir [43,44,47] isotherm equation (Eq. 5) is 1/q e = 1/q m + 1/q m bC e (linear form) (5) where q e (mmolg −1 ) is the equilibrium adsorption capacity at the equilibrium concentration C e (mmolml −1 ), q m (mmol g −1 ) is the maximum adsorption capacity on a Langmuir monolayer and b (mlmmol −1 ) is the Langmuir constant attributed to the energy of adsorption, and could be estimated from the intercept (1/ q m b) and slope (1/q m ) of a linear plot between 1/q e and 1/C e .…”