Jesús Soto Torres

Simultaneous metal adsorption on tannin resins

Vegetable tannin sorbent is evaluated as ion exchange resin using a multitracer study on the adsorption behavior of various elements. Lisiloma latisiliqua L. tannins, polycondensated into spherical pellets were chosen as sorbent resin material. Sorption evaluation of Ce, Cu(II), U(VI), Eu, Fe(III), Th, Nd as representatives of different classes of metal ions were done at different pH values. The distribution ratio of the studied elements was calculated from laboratory experiments. Tannic ion exchange material shows excellent ability for actinides and rare earth elements adsorption from waters. Using radiotracers, the number of catechins subunits involve in each tannin-metal complex was determined.

Use of immobilized tannin adsorbent for removal of Cr(VI) from water

Adsorption of Cr(VI) by two tannin sorbents is evaluated using radiotracers. Evaluation of the sorption process shows that the Cr(VI)-tannin molecule binding is the principal responsible for chromium adsorption. High sorption capacities were registered for both sorbents at pH 2. ForEucaliptus Saligna Sm sorbent (ETS) sorption capacity is 0.92±0.03 mmol/g and forLysiloma latisiliqua sorbent (LTS) is 3.8±0.3 mmol/g. Influence of different ions present in water is examined. High sorption capacity is reported for LTS in sea and tap water samples. It represents 90–94% of adsorption in distillated water.

HAV-1: A multipurpose multimonitor for reactor neutron flux characterization

A simple non-solid multimonitor HAV-1 for the systematic evaluation of reactor neutron flux parameters fork0 neutron activation analysis is presented. Solutions of Au, Zr, Co, Zn, Sn, U and Th (deposited in filter paper) are used to study the parameters α andf. Dissolved Lu is used to neutron temperature (Tn) determination, according to the Wescotts formalism. A multipurpose multimonitor HAV-1 preparation, certification and evaluation is presented.