Abstract
The adsorption of Mn(II) on indigenously prepared activated carbons (IPAC) fromBombax malabaricum,Pithecelobium dulse,Ipomea batatasandPeltaforum ferraginiumhave been studied. The effects of various experimental parameters have been investigated using batch adsorption technique. The extent of Mn(II) removal increased with decrease in initial concentration of the Mn(II), particle size of the adsorbent and increased with increase in contact time, amount of adsorbent used and the initial pH of the solution. Adsorption data were modeled using Freundlich and Langmuir adsorption isotherms and first order kinetic equations. The kinetics of adsorption was found to be first order with regard to intra-particle diffusion rate. The results indicate that such carbons could be employed as low cost adsorbents in waste water treatment for the removal of Mn(II).
Highlights
Manganese(II) is present in water supplies as a result of natural processes involving both catchments and erosion
The percentage removal was found to decrease exponentially, while the amount adsorbed increased exponentially with the increase in initial concentration of Mn(II). This indicates that there exist reductions in immediate solute adsorption, owing to the lack of available active sites required for the high initial concentration of Mn(II)
The adsorption capacities of indigenously prepared activated carbons (IPAC) are high and they could be employed as low cost adsorbents for the removal of Mn(II)
Summary
Manganese(II) is present in water supplies as a result of natural processes involving both catchments and erosion. The monolayer adsorption capacities of the adsorbents are found to be of the order: BMC> PLDC > IBC > PFC
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