Optimization of anionic dye removal using cross-linked chitosan composite as eco-friendly bio-adsorbent

被引：14
作者：
Elhady, Sarah [1 ]
Bassyouni, M. [2 ,3 ]
Elshikhiby, M. Z. [4 ]
Saleh, Mamdouh Y. [4 ]
Elzahar, Medhat H. [4 ]
机构：
[1] High Inst Engn & Technol New Damietta, Dept Civil Engn, Sanit & Environm Engn, New Damietta, Egypt
[2] Port Said Univ, Fac Engn, Dept Chem Engn, Port Said 42526, Egypt
[3] Port Said Univ, Ctr Excellence Membrane Based Water Desalinat Tech, Port Said 42526, Egypt
[4] Port Said Univ, Fac Engn, Dept Civil Engn, Port Fouad 42526, Port Said, Egypt
来源：
APPLIED WATER SCIENCE | 2024年 / 14卷 / 07期
关键词：
Cross-linked chitosan; Box-Behnken design; Adsorption isotherm; Adsorption kinetics; TEXTILE DYES; ADSORPTION; CHROMIUM;
D O I：
10.1007/s13201-024-02210-6
中图分类号：
TV21 [水资源调查与水利规划];
学科分类号：
081501 ;
摘要：
The environmental impact of wastewater discharged from the textile dyeing industry has a significant challenge and influence on aquatic ecosystems and human health if not properly managed. This study aimed to develop a novel cross-linked chitosan composite, denoted as chitosan/fly ash/polyvinyl alcohol (Ch/FA/PVA), as a bio-adsorbent for removing Congo Red (CR) textile dye from industrial wastewater. The synthesis involved the incorporation of FA into the chitosan matrix at various ratios to optimize the process. A specifically tailored composite, Ch/FA0.75/PVA, exhibited superior performance with a remarkable 99.7% CR removal under optimum conditions: adsorbent dose (0.9 g/l), contact time (50 min), and dye concentration (40 mg/l). The characterization of Ch/FA0.75/PVA through SEM-EDX, BET, FTIR, and pHzpc confirmed its suitability for adsorption. Employing Box-Behnken design and analysis of variance (ANOVA) facilitated the optimization of key adsorption variables. The Freundlich model described the adsorption equilibrium, indicating a maximum adsorption capacity of 263.15 mg/g for CR dye. The pseudo-second-order model demonstrated favorable kinetics. The study was scaled up to the practical application of Ch/FA0.75/PVA in a pilot plant for industrial wastewater treatment, revealing substantial removal percentages for dye, color, COD, BOD5 and TDS. This comprehensive approach highlights the promising efficacy of Ch/FA0.75/PVA in addressing environmental concerns associated with textile dye wastewater.
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页数：22
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