Abstract

Aminated avocado seed powder (AASP)—an eco-friendly novel adsorbent has been used for the removal of Acid Yellow 17 (AY 17) and Amaranth (AMR) from an aqueous phase. The AASP (before and after adsorption) was systematically characterized by different analytical techniques such as FT-IR, FESEM, EDX, and N₂ adsorption-desorption analysis. Non-linear form of various kinetic (PFO and PSO) and isotherm (Langmuir and Freundlich) models were used to examine the adsorption behavior of AY 17 and AMR onto AASP. The adsorption of AY 17 and AMR onto AASP was well illustrated by the PSO kinetic model and Langmuir isotherm models. At 303 K, the maximum adsorption capacities (obtained from the Langmuir) of the AASP for AY 17 and AMR was 42.7 and 89.2 mg/g, respectively. The AY 17 and AMR adsorption was strongly pH-dependent with an optimum pH value of 2.0. Activation energy was calculated as 12.3 and 16.3 kJ/mol for AY 17 and AMR respectively, suggesting physical adsorption. The positive values of ΔG^o and ΔH^o indicated that the adsorption process of AY 17 and AMR onto AASP was non-spontaneous and endothermic. The negligible loss of adsorption capacity and excellent regeneration of AASP were observed for the five cycles.

Statement of novelty: The present research majorly focused on the synthesis of adsorbent from Avocado seed for the removal of Acid Yellow 17 and Amaranth anionic dyes from aqueous solution. Although the literature is available on direct seed powder as adsorbent, to the best of our knowledge, no chemical modified adsorbent synthesis was not available. Hence, to fill the gap in the literature, we chose the following study that significantly enhanced the adsorption efficiency of the selected anionic dyes.

摘要

胺化鳄梨籽粉 (AASP) — 一种环保的新型吸附剂，已用于从水相中去除酸性黄 17 (AY 17) 和苋菜红 (AMR)。AASP（吸附前和吸附后）通过不同的分析技术系统地表征，如 FT-IR、FESEM、EDX 和 N ₂吸附-解吸分析。各种动力学（PFO 和 PSO）和等温线（Langmuir 和 Freundlich）模型的非线性形式用于检查 AY 17 和 AMR 在 AASP 上的吸附行为。PSO 动力学模型和朗缪尔等温线模型很好地说明了 AY 17 和 AMR 在 AASP 上的吸附。在 303 K 时，AASP 对 AY 17 和 AMR 的最大吸附容量（从 Langmuir 获得）分别为 42.7 和 89.2 mg/g。AY 17 和 AMR 吸附强烈依赖于 pH 值，最佳 pH 值为 2.0。AY 17 和 AMR 的活化能分别计算为 12.3 和 16.3 kJ/mol，表明存在物理吸附。Δ G ^o和 Δ H ^o的正值表明 AY 17 和 AMR 在 AASP 上的吸附过程是非自发和吸热的。在五个循环中观察到吸附能力的损失可以忽略不计，并且 AASP 的再生效果很好。

新颖性声明：目前的研究主要集中在从鳄梨种子中合成吸附剂，用于从水溶液中去除酸性黄 17 和苋菜红阴离子染料。尽管有关于直接种子粉末作为吸附剂的文献，但据我们所知，没有化学改性的吸附剂合成可用。因此，为了填补文献中的空白，我们选择了以下显着提高所选阴离子染料吸附效率的研究。