Repository logo
 

Estudio preliminar de la cascarilla de arroz modificada y su efecto en la adsorción de Cr(VI) en solución

Loading...
Thumbnail Image

Date

2016

Journal Title

Journal ISSN

Volume Title

Publisher

Corporación Universitaria Lasallista, Editorial Lasallista.

Abstract

There are several studies that affirm that rice husk has a good adsorption capacity in an aqueous solution for removing Cr(VI). On the other hand, the Fenton reagent leads to the formation of hydroxyl radicals, considered as highly oxidant species, and this has brought their wide application in water treatments. Concerning the rice husk, a waste from agricultural industries, it is regarded as an environmental problem given its accumulation, but this waste contains a lot of lignin, cellulose, hemicellulose and silicon oxides and, therefore, it is an efficient natural adsorbent to remove heavy metals. The chemical modification of these materials ́ surfaces increases the adsorption capacity of metals in solutions.Objective. Determine the conditions for the modification reaction of rice husk with the Fenton reagent and establish the effect on the removal of Cr(VI) in aqueous solution before and after the modification.materials and methods. The effect of variables such as initial pH, [Fe+2]/[H2O2] ratio and time of the reactants were analyzed in order to establish the best conditions for the modification. Then, a 2k factorial analysis was performed with the initial metal concentration (C), acidity of the medium (pH) and adsorbent ́s dosage (D) variables, in order to establish the changes in terms of removal percentages.Results. It was demonstrated that with a lower dose of the contaminant (0.7 ppm), the removal percentages reached 90% in both the modified and the native husks.Conclusions.This research work demonstrated the structural modification of rice husk and the Fenton reagent and also demonstrated that, as the Cr(VI) is increased, the removal percentage is lower. Therefore, the Cr(VI) concentration is a significant variable in the metals ́ removal in a solution and, the other way around, the dose of the adsorbent in the ratio used is not a significant variable in the model obtained.

Description

Keywords

Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Productos agrícolas, Arroz, Cromo - Investigaciones, Tratamiento de aguas, Asorbentes

Citation

Revista Producción + Limpia - Enero - Junio de 2016. Vol.11, No.1