کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11003351 | 1456912 | 2019 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Azo dye adsorption on anthracite: A view of thermodynamics, kinetics and cosmotropic effects
ترجمه فارسی عنوان
جذب رنگ آزو بر روی آنتراسیت: دیدگاه ترمودینامیک، سینتیک و اثرات کیهان شناسی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
چکیده انگلیسی
The present paper presents anthracite - a low cost and naturally abundant coal - as a potential adsorbent of the azo dye Acid Yellow 42, evaluating parameters such as dye concentration, temperature and ionic strength. A thermodynamic and kinetic approach was also described. Interactions between the adsorbate and anthracite were described by isothermal titration as well. Anthracite was characterized by TGA/DTA, FT-IR, X-ray, TEM/EDS. The adsorption system anthracite-dye reached equilibrium in less than 10â¯min at room temperature, with a maximum adsorption capacity as high as 47â¯mgâ¯gâ1. A multi-layer pattern is observed according to the Freundlich adsorption model and the adsorption kinetics is best explained by the pseudo-second-order model. A chemisorption phenomenon drives the initial process, followed by a multi-layer physisorption phenomenon between dye molecules, with a prevalence of electrostatic interactions. The adsorption of acid yellow 42 onto anthracite is a spontaneous (ÎadsG°â¯=â¯â11.68â¯kJâ¯molâ1) and endothermic (ÎadsH°â¯=â¯58.59â¯kJâ¯molâ1) process, suggesting that the driving force to promote adsorption is the increase of the degree of freedom in the interface anthracite/solution (ÎadsS°â¯=â¯70.26â¯kJâ¯molâ1). The amount of AY immobilized at the surface of anthracite increased with the temperature rising, evidencing an endothermic process. Cations and anions influence the adsorption process, not obeying and following Hofmeister series, respectively. Ionic charge lead to increase Zeta potential. Therefore, anthracite highlights as a potential adsorbent material for azo dyes compared with other natural materials and some activated carbons.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 209, 31 January 2019, Pages 806-814
Journal: Separation and Purification Technology - Volume 209, 31 January 2019, Pages 806-814
نویسندگان
Nathalia Ribeiro de Mattos, Cassiano Rodrigues de Oliveira, Luis Gustavo Brogliato Camargo, Raissa Samira Rocha da Silva, Rodrigo Lassarote Lavall,