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- W2167586212 abstract "Arsenic and selenium are two oxyanionic elements which cause for concern in drinking water resources due to their toxicity and high mobility. Finding novel and low cost adsorbents for removing pollutants has become a very important issue for protecting water quality. In this study, low cost and locally available natural manganese oxide minerals are used as adsorbent material for the removal of arsenic and selenium ions from aqueous solutions in batch experiments. The pseudo-first-order, pseudo-second-order kinetic models, and the intraparticle diffusion model were used to describe the kinetic data of adsorption process. Comparison among the models showed the sorption kinetics was best described by the pseudo second-order model. The Langmuir and Freundlich adsorption isotherm models were applied to the experimental equilibrium data for different temperatures. The Langmuir model agrees with experimental data well. The adsorption capacities (Q<sup>o</sup>) of manganoxide mineral for arsenic and selenium ions were calculated from the Langmuir isotherm and were in the range of 598 to 723 µg/g for arsenic and 1396 to 1475 µg/g for selenium ions at different temperatures. The activation energy, change of Gibbs free energy, enthalpy, and entropy of adsorption were also evaluated for the adsorption of arsenic and selenium onto manganese oxide mineral. Thermodynamic studies showed that the arsenic and selenium uptake reactions were endothermic and spontaneous in nature. Based on the results found in this study, manganese oxide minerals can be used as adsorbents for arsenic and selenium ions removal processes as an alternative natural mineral." @default.
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- W2167586212 date "2014-07-01" @default.
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- W2167586212 title "The Use of Manganese Oxide Minerals for the Removal Arsenic and Selenium Anions from Aqueous Solutions" @default.
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- W2167586212 doi "https://doi.org/10.13189/eee.2014.020501" @default.
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