<b>KINETIC STUDY OF LIQUID-PHASE ADSORPTIVE REMOVAL OF HEAVY METAL IONS BY ALMOND TREE (<i>TERMINALIA CATAPPA L.</i>) LEAVES WASTE</b>

Abstract

The kinetic sorption of five metal ions-Al 3+ , Cr 6+ , Zn 2+ , Ag + and Mn 2+-from aqueous solution onto almond tree leaves (ATL) waste in single component system has been studied. The experimental data was analyzed in terms of intraparticle diffusion and rate of adsorption, thus comparing transport mechanism and chemical sorption processes. The sorption rates based on the pseudo-second order rate constants for the five metal ions are 0.018 (Al 3+), 0.016 (Cr 6+), 0.023 (Zn 2+), 0.021 (Ag +) and 0.022 (Mn 2+) g/mg.min. The adsorption rates are rapid and within 180 min of agitation more than 85 percent of these metal ions has been removed from solution by the ATL waste biomass. The kinetic data suggest that the overall adsorption process is endothermic, and that the rate-limiting step is a surface diffusion controlled process. The results from this study have revealed that the ATL waste, which is hitherto an environmental nuisance, has the ability to adsorb metal ions from solution and the data are relevant for optimal design of wastewater treatment plants. The low cost and easy availability of ATL waste make potential industrial application a strong possibility.

Kinetic study on removal of heavy metal ions from aqueous solution by using soil

“…A non-linear relationship for the plot of In(1-F) versus t indicated that the diffusion of adsorbate onto the adsorbent surface is film-diffusion controlled (Horsfall and Vicente 2007). In such condition, an external factor such as high agitation speed may be needed to break the diffusion barrier and increase adsorbate-adsorbent interaction.…”

“…Fractional attainment of equilibrium (FAE) and liquid film diffusion kinetic model It was established that the kinetic theory behind FAE was that it may be used to explain the adsorption process in terms of adsorption being controlled by filmdiffusion (Horsfall and Vicente 2007). When the transport of the solute molecules from the liquid phase up to the solid phase, boundary plays the most significant role in adsorption; the kinetic model equation may be applied as Eq.…”

Characterization of date palm fronds as a fuel for energy production

“…Ca was detected only in Ajwah and Sukariah samples. Metallic elements, such as Mg, Na, Si, K and Ca should be in the samples to be considered as thermos-chemical processing systems [15]. However, higher content of some of elements in a feedstock can cause critical problems while handling the ash and downstream equipment.…”

Removal of Cr (VI) Using Low Cost Activated Carbon Developed By Agricultural Waste

“…Agricultural waste are readily available and low in cost also. It has been studied by previous research on removal of heavy metal with the help of agricultural waste adsorbent like sugarcane bagasse [6] , plant waste leaves [7] , pomegranate peel [4] , rice hull [10] , saw dust, [1] cotton seed and tea leaves [9] etc. it has been studied that Peat moss effective in adsorbing heavy metals.…”