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Removal of Erythrosine B dye from water effluents using crop waste pumpkin seed hulls as adsorbent

机译：使用农作物废南瓜籽壳作为吸附剂去除废水中的赤藓红B染料

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摘要

Erythrosine B is widely used for coloring in various applications, especially in the food industry, despite its already proved toxicity and carcinogenicity. The agrowaste pumpkin seed hulls were applied as potential adsorbent for the removal of Erythrosine from aqueous solutions. Adsorption mechanism and kinetics were analyzed for design purposes. The seed hulls were characterized by specific techniques before and after dye retention. It was found that the attachment of Erythrosine B molecules on adsorbent surface may be attributed to the interactions between carboxyl and/or carbonyl groups of both dye and agrowaste wall components. A univariate approach followed by a factorial design was applied to study and analyze the experimental results as well as to estimate the combined effects of the process factors on the removal efficiency and dye uptake. Adsorption mechanism may be predominantly due to intraparticle diffusion, dependent on pore size. The four equilibrium models applied fitted the data well; the maximum adsorption capacity for Erythrosine was 16.4 mg/g. The results showed that adsorbent is effective for Erythrosine B removal for a large concentration range in aqueous solutions (5400 mg/L) in batch systems.
机译：赤藓红B尽管已被证明具有毒性和致癌性，但仍广泛用于各种应用中的着色，特别是在食品工业中。将农作物南瓜籽壳用作潜在的吸附剂，用于从水溶液中去除赤藓红。为了设计目的，分析了吸附机理和动力学。在保留染料之前和之后，通过特定技术对种子壳进行表征。已经发现，赤藓红B分子在吸附剂表面上的附着可能归因于染料和促生长剂壁组分的羧基和/或羰基之间的相互作用。采用单因素方法，然后进行因子设计，以研究和分析实验结果，并估计工艺因素对去除效率和染料吸收的综合影响。吸附机理可能主要归因于颗粒内扩散，具体取决于孔径。应用的四个均衡模型很好地拟合了数据。赤藓红的最大吸附容量为16.4 mg / g。结果表明，对于间歇系统中的水溶液（5400 mg / L）中的较大浓度范围，吸附剂均可有效去除赤藓红B。

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