Bibliographic citations
Meza, F., (2017). Estudio de la adsorción de arsénico presente en soluciones acuosas empleando materiales adsorbentes a base de quitosano modificado [Tesis, Pontificia Universidad Católica del Perú]. http://hdl.handle.net/20.500.12404/9423
Meza, F., Estudio de la adsorción de arsénico presente en soluciones acuosas empleando materiales adsorbentes a base de quitosano modificado [Tesis]. PE: Pontificia Universidad Católica del Perú; 2017. http://hdl.handle.net/20.500.12404/9423
@mastersthesis{renati/12980,
title = "Estudio de la adsorción de arsénico presente en soluciones acuosas empleando materiales adsorbentes a base de quitosano modificado",
author = "Meza López, Flor de Liss",
publisher = "Pontificia Universidad Católica del Perú",
year = "2017"
}
The main objective of the present investigation is the study of the adsorption of arsenic with adsorbent materials based on modified chitosan. The importance of this study lies in the growing concern about the environmental impact and the negative effect on the health generated by this pollutant due to its high toxicity at low concentrations and its bioaccumulation capacity. The adsorbent materials are obtained from the precursor material chitosan (QUI). Subsequent modifications made to the precursor, such as the incorporation of the carboxyl group (COOH) to form the carboxymethylchitosan (CMQ), the functionalization with iron by impregnation and in situ oxidation method with a post treatment for both QUI and CMQ, resulted in the materials Fe-QUI and Fe-CMQ. The adsorbent materials are characterized by different instrumental techniques: NMR, FTIR, XRD, SEM, EDX, potentiometric titration, Boehm titration and pHPZC. Stability and percentage of iron impregnated are also evaluated. The adsorption study results indicate that materials obey the following order: Fe-CMQ> Fe-QUI> QUI >> CMQ, based on the higher adsorption capacity obtained for both retention of As (III) and As (V). The evaluation of adsorption parameters (pH and adsorbent mass), shows that the adsorption of As (III) is favored at pH 9 with a mass of 30 mg of adsorbent, whereas for As (V) the adsorption is favored at pH 4 and with a mass of 20 mg, due to the adsorbates speciation. All kinetic results are better correlated with the pseudo second order model, evidencing an adsorbate-adsorbent interaction based on the availability of active sites (acid / base and electrostatic interaction). Also, the adsorption isotherms results in general show that the adsorption occurs in active centers with a heterogeneous surface and with a homogenous distribution of energy.
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