Adsorption of Brilliant blue FCF (B1) and Allura Red (R40) colorants on cocoa shell: kinetics of the process

Michael Anibal Macias Pro, Alejandro Altamirano Briones, Erika Góngora Muñoz, Alex Fernández Andrade, Kevin Fernández Andrade
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Abstract

The use of dyes in food industrial processes is limited due to significant pollution in aquatic receptors from their wastewater. To address this issue, this study focused on evaluating the adsorption of dyes Allura Red (R40) and Brilliant blue FCF (B1) using cocoa shells (CS) as an absorbent. To achieve this, a pre-treatment was applied, which involved washing, grinding and drying at a temperature of 80 °C for 24 h, followed by a sieving process. The effect of the adsorbent dose was then analyzed and it was calculated that the optimal dose was 4 g/L. Additionally, the effect of contact time was studied through a kinetic analysis, all tests were carried out at a pH level of 2. The obtained data were fitted to kinetic models, which allowed us to conclude that the adsorption kinetics fit two different models depending on the initial solution conditions, in a range from 0 to 0.1512 mmol/L. Specifically, the Pseudo Second-Order (PSO) model fitted R40, while the Elovich model was appropriate for B1. In summary, CS was found to be a viable adsorbent for dyes in contaminated waters.
可可壳对亮蓝 FCF (B1) 和 Allura Red (R40) 着色剂的吸附:过程动力学
由于染料废水对水生受体造成严重污染,因此染料在食品工业流程中的使用受到限制。为解决这一问题,本研究重点评估了使用可可壳(CS)作为吸附剂对染料 Allura Red(R40)和 Brilliant blue FCF(B1)的吸附情况。为此,对可可壳进行了预处理,包括清洗、研磨和在 80 °C 温度下干燥 24 小时,然后进行筛分。然后分析了吸附剂剂量的影响,计算出最佳剂量为 4 克/升。此外,我们还通过动力学分析研究了接触时间的影响,所有试验都是在 pH 值为 2 的条件下进行的。我们将获得的数据拟合到动力学模型中,得出的结论是:根据溶液的初始条件,吸附动力学在 0 至 0.1512 mmol/L 的范围内符合两种不同的模型。具体来说,伪二阶(PSO)模型适合 R40,而 Elovich 模型适合 B1。总之,研究发现 CS 是污染水体中一种可行的染料吸附剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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