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- W2083722144 abstract "White rice husk ash (WRHA) was obtained via thermal degradation of rice husks in air, which was used to remove Mn(II) ions from aqueous solutions. Thermodynamic and kinetic studies of adsorption were conducted under agitation at 288, 298 and 308 K and different solution concentrations. The obtained results showed that the removal of Mn(II) ions from aqueous solutions using WRHA is a chemisorption process, where the OH-groups of SiO2 take part, releasing H+ ions in the solution. The adsorption process was well described with the Langmuir isotherm. On its basis, the values of ΔG°, ΔH° and ΔS° for the adsorption of Mn(II) ions onto WRHA were calculated. Pseudo-first-order kinetic equation was found as the most appropriate kinetic model. The values of the rate constants of the sorption process at the studied temperatures were calculated, which were found to be equal to k288 = 8.75 × 10− 4 min− 1, k298 = 2.53 × 10− 3 min− 1 and k308 = 6.69 × 10− 3 min− 1. Using the Arrhenius equation, the values of the activation energy (EA = 75.02 kJ mol− 1) and the frequency factor (A = 3.55 × 1010 min− 1) were calculated. It was concluded that WRHA is an effective and very cheap adsorbent for removing Mn(II) ions from water solutions." @default.
- W2083722144 created "2016-06-24" @default.
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- W2083722144 date "2014-09-01" @default.
- W2083722144 modified "2023-09-23" @default.
- W2083722144 title "Speciation of manganese in drinking water" @default.
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- W2083722144 doi "https://doi.org/10.1016/j.toxlet.2014.06.431" @default.
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