Removal of the Mixture of Azo Dyes Allura Red - Tartrazine by Adsorption onto Corncob

Abstract

-Synthetic dyes are widely used around the world, and big volumes of coloured effluents end up being discharged into water bodies. Allura Red and Tartrazine are azo dyes with a broad use spectrum mainly in food and textile industries and their removal from the aquatic ecosystems, is a challenge. In the last decades, several methods have emerged to find a solution of this environmental problem, among them, adsorption using agro-industrial by-products stands out as a high efficient and low cost metodology for the removal of dyes, both individual and in mixture. Thus, the aim of this work was to confirm the reliability of spectrophotometric techniques for quantifying coloured compounds and then to evaluate the adsorption process of the mixture Allura Red -Tartrazine through a 2 3 full factorial design with a central point. The Lambert-Beer law allows to quantify with errors lower than 2.0%. The best percentage of adsorption of the azo dyes mixture, in order of 94.92%, was achieved with a dosage of 20 g/L and concentrations of 20 ppm for both dyes. These results show that adsorption using agricultural wastes is a promising alternative for treating mixtures of dyes in solution.

A Sustainable and Cost‐Effective Bioadsorbent for the Removal of Allura Red from Contaminated Water

“…The only reported wastes (to the best of our knowledge) as adsorbents either directly or after pyrolysis for removing AR are pinewood, arabica coffee residues, coconut shell, corncob, guargum, peanut hull waste, sawdust, pecan nut shells, luffa cylindrica and bael patra. [42][43][44][45][46][47][48][49][50][51] Limited number of studies reported in this area was the impetus behind this study, which motivated us to attempt the potential of other varieties of agricultural wastes lying around us for treating wastewater in order to make it free from toxic dyes, like AR. This study aimed at investigating the efficiency of watermelon peels (WMP) waste before and after pyrolysis for AR removal from wastewater.…”

Evaluation of individual fungal species and their co-culture for degrading a binary mixture of dyes under solid-state fermentation

“…The absorption spectra of both dyes are partially overlapped, as it can be seen in figure 2. The quantification of BB and AR in mixture has been already studied (Villada & Hormaza, 2015;Jiménez et al, 2017) and it is performed through a mathematical model.…”