Fatemeh Sabermahani; Fariba Honarmand
Abstract
In this study, Magnetic Fe3O4-walnut sawdust nanocompositewas synthesized and used for removal of lead from aqueous solution. The size, structural, optical and morphological properties of nanoparticles have been analyzed by Scanning Electron Microscope )SEM) and Dynamic Light Scattering method. The effect ...
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In this study, Magnetic Fe3O4-walnut sawdust nanocompositewas synthesized and used for removal of lead from aqueous solution. The size, structural, optical and morphological properties of nanoparticles have been analyzed by Scanning Electron Microscope )SEM) and Dynamic Light Scattering method. The effect of pH, contact time, adsorbent dose, initial concentration, ionic strength and the effect of temperature on the adsorption was checked out in a batch process mode. Using the equilibrium constants obtained at different temperatures, the thermodynamic results parameters were calculated as ∆G, ∆H and ∆S. The thermodynamic parameters showed that the uptake of lead is spontaneous and endothermic. The data were fitted with the Langmuir and Freundlich equations to describe the adsorption equilibrium. The maximum adsorption capacity by using Langmuir equation was calculated 12.99 mg/g. The kinetic data followed by Pseudo second. Owing to such outstanding features, Magnetic Fe3O4-walnut sawdust nanocompositeproved the great potential in adsorption lead removal from aqueous solutions.
Adams Udoji Itodo; Rufus Sha’Ato; Johnson Idoko Adaji
Abstract
The study involves the adsorption of potentially toxic metals from brewery effluent (Beff), using size modified (UAD) and chemically modified (TAD) Borassus aethiopum biomass. Preliminary study and characterization of both brewery effluent and the derived adsorbents were recorded, with result ...
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The study involves the adsorption of potentially toxic metals from brewery effluent (Beff), using size modified (UAD) and chemically modified (TAD) Borassus aethiopum biomass. Preliminary study and characterization of both brewery effluent and the derived adsorbents were recorded, with result showing some water quality parameters greater than threshold limits set by legislation. Both classical and instrumental techniques adopted for Sorbent characterization show valid outcome. Batch kinetic studies were monitored along with the role of varying conditions (Effluent concentration, pH, time and temperature) that could influence cadmium (Cd) and chromium (Cr) adsorption. Model applicability test supported the Pseudo second-order, with a high correlation coefficient, least error sum and high precision in qe. cal./exp. The mode of transport is best explained with intra-particle diffusion, not as the only rate limiting process. Generally, the chemically treated biomass exhibited metal removal efficiencies that could compete with the function of commercial activated carbon (CAC).
