Silver Nanoparticles Supported onto TEMPO-Oxidized Cellulose Nanofibers for Promoting Cd2+ Cation Adsorption

被引:2
|
作者
Riva, Laura [1 ,2 ]
Dotti, Anna [1 ,2 ]
Iucci, Giovanna [2 ,3 ]
Venditti, Iole [3 ]
Meneghini, Carlo [3 ]
Corsi, Ilaria [4 ]
Khalakhan, Ivan [5 ]
Nicastro, Gloria [1 ]
Punta, Carlo [1 ,2 ]
Battocchio, Chiara [3 ]
机构
[1] Politecn Milan, Dept Chem Mat & Chem Engn G Natta, I-20131 Milan, Italy
[2] INSTM Local Unit, I-20131 Milan, Italy
[3] Roma Tre Univ, Dept Sci, I-00146 Rome, Italy
[4] Univ Siena, Dept Phys Earth & Environm Sci, I-53100 Siena, Italy
[5] Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, Prague 18000, Czech Republic
关键词
nanocomposites; silver-decoratedsorbents; in situ deposition; water treatment; nanocellulose-heavymetal interactions; WATER; POLYSACCHARIDES; NANOCOMPOSITES; NANOMATERIALS; ADSORBENT; OXIDATION; CU(II);
D O I
10.1021/acsanm.3c06052
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nanocellulose constitutes a sustainable and biobased solution both as an efficient sorbent material for water treatment and as support for other inorganic nanomaterials with sorbent properties. Herein, we report the synthesis of a nanocomposite by deposition of in situ-generated silver nanoparticles (AgNPs) onto TEMPO-oxidized cellulose nanofibers (TOCNFs). Following an in-depth analytical investigation, we unveil for the first time the key role of AgNPs in enhancing the adsorption efficiency of TOCNF toward Cd2+ ions, chosen as model heavy metal contaminants. The obtained nanocomposite shows a value of Cd2+ sorption capacity at equilibrium from 150 mg L-1 ion aqueous solutions of similar to 116 mg g(-1) against the value of 78 mg g(-1) measured for TOCNF alone. A combination of field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS) analyses suggests that Cd2+ ions are mainly adsorbed in the neighborhood of AgNPs. However, XPS characterization allows us to conclude that the role of AgNPs relies on increasing the exposure of carboxylic groups with respect to the original TOCNF, suggesting that these groups are still responsible for absorption. In fact, X-ray absorption spectroscopy (XAS) analysis of the Cd-K edge excludes a direct interaction between Ag-0 and Cd2+, supporting the XPS results and confirming the coordination of the latter with carboxyl groups.
引用
收藏
页码:2401 / 2413
页数:13
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