Removal Of methylene blue dye from simulated wastewater by alginic acid fiber as adsorbent: Equilibrium, kinetic, and thermodynamic studies

Authors

  • Chunxiang Guo,

    1. State Key Lab Cultivating Base of Advanced Fibers and Modern Textiles, Qingdao University, Qingdao 266071, China
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  • Qingshan Kong,

    Corresponding author
    1. State Key Lab Cultivating Base of Advanced Fibers and Modern Textiles, Qingdao University, Qingdao 266071, China
    • State Key Lab Cultivating Base of Advanced Fibers and Modern Textiles, Qingdao University, Qingdao 266071, China.
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  • Jixian Gao,

    1. Beijing Key Lab of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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  • Quan Ji,

    1. State Key Lab Cultivating Base of Advanced Fibers and Modern Textiles, Qingdao University, Qingdao 266071, China
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  • Yanzhi Xia

    Corresponding author
    1. State Key Lab Cultivating Base of Advanced Fibers and Modern Textiles, Qingdao University, Qingdao 266071, China
    • State Key Lab Cultivating Base of Advanced Fibers and Modern Textiles, Qingdao University, Qingdao 266071, China.
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Abstract

Alginic acid fiber was used as a novel adsorbent to remove methylene blue from aqueous solution, and adsorption mechanisms were investigated. System variables, including contact time, pH, temperature, and initial concentration were examined to investigate the effect on adsorption in batch experiments. The results showed that equilibrium reached in less than 20 min and pH significantly influenced the equilibrium value. Langmuir, Freundlich, and Temkin isotherm models were employed to analyse the isotherm behaviours. It was found the isotherm behaviours conform to Freundlich and Temkin models well, indicating a chemisorption process. Pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were employed to investigate kinetic behaviours. The kinetic behaviour is best described by pseudo-second-order model. Thermodynamic parameters indicate that the process is spontaneous and exothermic.

Abstract

De la fibre d'acide alginique a été utilisée comme nouvel adsorbant pour éliminer le bleu de méthylène d'une solution aqueuse. Les mécanismes d'adsorption ont été étudiés. Les variables du système, y compris le temps de contact, le pH, la température et la concentration initiale, ont été examinées pour étudier l'effet de l'adsorption lors d'expérimentation en lots. Les résultats ont montré que l'équilibre était atteint en moins de 20 min et que le pH influençait significativement la valeur d'équilibre. Les modèles isothermes de Langmuir, Freundlich et Temkin ont été utilisés pour analyser les comportements isothermiques. On a conclu que les comportements isothermiques étaient relativement conformes aux modèles de Freundlich et Temkin, ce qui indique un processus de chimisorption. Des modèles de pseudo-premier ordre, de pseudo-second ordre et de diffusion de macropores ont été utilisés pour étudier les comportements cinétiques. Le comportement cinétique est décrit au mieux par un modèle de pseudo-second ordre. Les paramètres thermodynamiques indiquent que le processus est spontané et exothermique.

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