Fractionational and structural characterization of lignin and its modification as biosorbents for efficient removal of chromium from wastewater : a review / Bing Wang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 25 p. Titre : Fractionational and structural characterization of lignin and its modification as biosorbents for efficient removal of chromium from wastewater : a review Type de document : texte imprimé Auteurs : Bing Wang, Auteur ; Yong-Chang Sun, Auteur ; Run-Cang Sun, Auteur Année de publication : 2019 Article en page(s) : 25 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Caractérisation Cuirs et peaux -- Industrie -- Aspect de l'environnement Déchets industriels -- Elimination Eaux usées -- Epuration Eaux usées -- Teneur en chrome Extraction (chimie) Lignocellulose Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The removal of chromium (Cr) from wastewater by various adsorbents has been investigated. As compared with the commercial activated carbon, the biosorbents with inexpensive and high adsorption capacities are developed from lignocellulosic wastes. Lignin, existing in lignocellulosic biomass, is the second most abundant resource in nature. Recently, lignin-based bio-sorbents were served as an advanced novel material for the metal ions and dye adsorption from wastewater. It has showed several advantages in the wastewater treatments because of the low-cost, high adsorption capacity, easy recover, and possibility of metal recovery. In this review, the isolation of lignin from lignocellulosic biomass was summarized, and the structural characteristics of lignin were comparably analyzed. The modification of lignin was performed to obtain a large surface area, strong binding-site, and high and quick adsorption properties of lignin-based adsorption materials. The adsorption efficiency of Cr ions was found to be strongly dependent on the pH of the wastewater. To further illustrate the adsorption process, the structural changes and the interactions between the metal ions and the functional groups of the lignin-based biosorbents in the adsorption process should be further investigated. Once the cost-effective and high-efficiency modification techniques are developed, lignin-based adsorbents can be expected to be the most suitable alternatives for Cr ions removal from wastewater in industry. Note de contenu : - FRACTIONATION AND CHARACTERIZATION OF LIGNIN FROM LIGNOCELLULOSIC BIOMASS : Lignin extraction - Chemical composition and characterization of lignin - FTIR spectroscopy analysis - Thermogravimetric analysis - 1H-NMR spectra analysis - 31P NMR - Two-dimensional HSQC NMR technique - Lignin utilization - FUNCTIONAL GROUPS PRESENT INLIGNIN AND LIGNIN MODIFICATION : Functional groups present in lignin - Lignin modification - AN OVERVIEW OF THE LEATHER INDUSTRY : Cr removal from wastewater - Present disposal methods for the Cr (III)/Cr (VI) removal from wastewater - Lignocellulosic biomass and other non-living materials as biosorbents for the removal of Cr - CR REMOVAL FROM WASTEWATER BY USING LIGNIN-BASED BIOSORBENTS : Modification of lignin for Cr removal from wastewater - Lignin-based activated carbons production and Cr adsorption - Cr adsorption mechanisms - Table 1 Composition of cellulose, hemicelluloses, and lignin in various biomass - Table 2 Functional groups found in 100, C9 repeat units of lignin - Table 3 Cr adsorption by various biosorbents from lignocellulosic biomass and other materials DOI : https://doi.org/10.1186/s42825-019-0003-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0003-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36950 [article]

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