Adsorption of Cr (VI) on lignocellulosic wastes adsorbents: an overview and further perspective

被引:0
|
作者
S. A. L. Bachmann
I. V. J. Dávila
T. Calvete
L. A. Féris
机构
[1] Federal University of Rio Grande Do Sul,School of Engineering, Department of Chemical Engineering
[2] Federal University of Rio Grande Do Sul,School of Engineering, Department of Materials Engineering
[3] Federal Institute of Education,undefined
[4] Science and Technology of Rio Grande Do Sul,undefined
来源
International Journal of Environmental Science and Technology | 2022年 / 19卷
关键词
Chromium adsorption; Equilibrium isotherm; Kinetic study; Lignocellulosic waste; Mechanism study;
D O I
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中图分类号
学科分类号
摘要
Hexavalent chromium (Cr VI) has mutagenic and carcinogenic properties and causes severe health and environmental effects. The chromium’s adsorption equilibrium in aqueous media, its mechanisms, and different lignocellulosic wastes have been studied by many researchers. In this way, this paper provides a systematic, updated, and critical overview of Cr (IVI) adsorption by lignocellulosic waste adsorbent. Besides, analyzing the Cr (VI) problems in the aquatic environment addressed to lignocellulosic waste and its properties as adsorbent. Also, it was made a deep revision about important topics such as chemical regeneration and Cr (VI) recovery, characterization techniques, and interfering factors effects (e.g., pH, dosage). In addition, it was studied carefully the adsorption phenomena through several mathematical models of kinetics and isotherms and analyzed the thermodynamics results reported by an important number of research papers. Through this review, it was observed that the lignocellulosic wastes adsorption capacities usually range from 0.32 to 403.23 mg g−1, the adsorbent percentage removal after regenerating cycle ranged between 26.5 and 98.69%, and a greater performance of removing Cr (VI) occurs at pH range 1–6. The pseudo-second-order and Langmuir models were the models that presented the best adjustment of the experimental data for Cr (VI) adsorption, and the thermodynamic nature was spontaneous and endothermic for most cases. Further studies about lignocellulosic waste adsorbents lifecycle, stability, large-scale production, and production cost analysis are still necessary to determine the stability and efficacy of lignocellulosic wastes adsorbents in real effluent treatment.
引用
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页码:12727 / 12748
页数:21
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