Abstract

CUETOCUE-PETINS, Marlon Manuel; SARRIA-VILLA, Rodrigo Andrés; GALLO-CORREDOR, José Antonio  and  BENITEZ-BENITEZ, Ricardo. Optimization of the process of obtaining a natural pine bark adsorbent. Rev. ion [online]. 2020, vol.33, n.2, pp.61-70.  Epub Aug 30, 2020. ISSN 0120-100X.  https://doi.org/10.18273/revion.v33n2-2020005.

The tannins present in the bark of Pinus patula have been extracted to develop an adsorbent through a crosslinking reaction, which occurs between the phenolic groups due to treatment with sulfuric acid, which is used as a crosslinking agent for polyphenolic groups present in the tannins. In the present study, the Box-Behnken design is used to maximize the performance of the crosslinking reaction and, therefore, to obtain the best mechanical properties of the prepared adsorbent. The response variable studied was the percentage yield of the reaction, and the independent variables evaluated in the Box-Behnken design included, Solid/Liquid ratio (grams of tannin/mL of H2 SO4 ) (0.2-0.5 gmL-1), temperature (75-95 °C) and time (8-12 h). The verified statistical model estimates an optimal percentage yield of 73.81%, it is obtained with an S/L ratio of 0.499 gmL-1, temperature of 95 °C and reaction time of 10.45 h. The modification of the surface functional groups of the tannins was established by means of the IR spectra. The adsorbent had a BET surface area of 4.17 m2 g-1.

Keywords : Tannins; Crosslinking; Adsorbent.

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