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Lead Adsorption onto Various Solid Surfaces

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DOI: 10.4236/nr.2015.63014    2,487 Downloads   2,885 Views   Citations
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ABSTRACT

Adsorption is becoming an important method in water and wastewater treatment technology at low concentrations. Pb2+ adsorption at low concentration onto various solid surfaces using either nano metal oxide of MnO2, or granulated activated carbon (GAC) or agricultural by-products such as tea leaves and coffee residue are considered promising. In this adsorption study the measurements were conducted by equilibrating Lead solutions at different concentrations range 19 - 291 μmol·L-1 with various adsorbent suspensions in the concentration range 0.388 - 8.738 g·L-1. Comparing all the adsorption capacities calculated using Langmuir equation Pb2+ adsorption by MnO2 shows the highest adsorption capacity with the estimated Γm = 528.0 μmol·g–1 at a fixed equilibrium constant K = 0.0119 L·μmoL-1. In addition, the Pb2+ adsorption by coffee residue is subject to a particle concentration effect in which the adsorption density decreases as the concentration of solid adsorbent Cs is increased. The Pb2+ adsorption by tea leaves, MnO2 and GAC shows less dependency to the concentration of solid adsorbent Cs, especially at lower metal ion concentrations. In the particular case of Pb2+ adsorption on MnO2 there appears to be no dependence on Cs.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Utomo, H. (2015) Lead Adsorption onto Various Solid Surfaces. Natural Resources, 6, 152-158. doi: 10.4236/nr.2015.63014.

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