Sorption and Desorption Processes of Selenium VI

Authors: Z I GonzálezAcevedo M T Olguín C E RodríguezMartínez H FríasPalos

Publish Date: 2012/05/06

Volume: 223, Issue: 7, Pages: 4119-4128

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Abstract

The sorption and desorption processes of SeVI onto nonliving Eichhornia crassipes E crassipes and Lemna minor L minor were evaluated Different pH values of the initial Se solution 20 μg L−1 were tested at static conditions At dynamic conditions of horizontal flow biomasspacked columns BPC were estimated as prepared pH 4 and unprepared pH 6–7 and at different flow rates The desorption process was tested using HCl 01 M as the eluent The maximum Se uptake took place at a pH of 4 for both biomasses The lowest flow rate improves major Se removal due to the increase in contact time The Se was desorbed from the biomass with elution efficiencies of 5 and 18  for E crassipes and L minor respectively Nevertheless more time was needed to increase these efficiencies and reach desaturation times The breakthrough curves showed that unprepared E crassipes and L minor BPC at horizontal flow with a flow rate of 6 and 4 mL min−1 respectively had a biomass removal capacity of 0135 and 0743 μg g−1 correspondingly The system of E crassipes is more efficient suggesting an ion exchange sorption mechanism This demonstrates that nonliving E crassipes and L minor have the capacity to remove Se from very dilute solutionsThe authors are grateful for the financial support from The Mexican Council of Science and Technology CONACyT Grant for basic science is 34368E/2009 They also wish to thank the National Institute of Nuclear Research project AM914 for the financial assistance as well as the partial financial support from CONACyT project 131174Q for M T Olguín

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