<br>银纳米颗粒负载在 TEMPO 氧化纤维素纳米纤维上，以促进 CD2+ 阳离子吸附,ACS Applied Nano Materials

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银纳米颗粒负载在 TEMPO 氧化纤维素纳米纤维上，以促进 CD2+ 阳离子吸附
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2024-01-08 , DOI: 10.1021/acsanm.3c06052
Laura Riva ₁ , Anna Dotti ₁ , Giovanna Iucci ₂ , Iole Venditti ₂ , Carlo Meneghini ₂ , Ilaria Corsi ₃ , Ivan Khalakhan ₄ , Gloria Nicastro ₁ , Carlo Punta ₁ , Chiara Battocchio ₂

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纳米纤维素是一种可持续的生物基解决方案，既可以作为用于水处理的高效吸附剂材料，也可以作为其他具有吸附特性的无机纳米材料的载体。在此，我们报道了通过将原位生成的银纳米颗粒（AgNPs）沉积到 TEMPO 氧化纤维素纳米纤维（TOCNF）上来合成纳米复合材料。经过深入的分析调查，我们首次揭示了 AgNPs 在提高 TOCNF 对 Cd²⁺ 离子的吸附效率方面的关键作用，这些离子被选为模型重金属污染物。获得的纳米复合材料在 150 mg ^L-1 离子水溶液的平衡时显示 Cd²⁺ 吸附容量值为 ∼116 mg ^g-1，而单独测量的 TOCNF 值为 78 mg ^g-1。场发射扫描电子显微镜（FE-SEM）、能量色散 X 射线（EDX）和 X 射线光电子能谱（XPS）分析的组合表明，Cd²⁺ 离子主要吸附在 AgNPs 附近。然而，XPS 表征使我们能够得出结论，AgNP 的作用取决于增加羧基相对于原始 TOCNF 的暴露，这表明这些基团仍然负责吸收。事实上，Cd-K 边缘的 X 射线吸收光谱（XAS）分析排除了 Ag⁰ 和 Cd²⁺ 之间的直接相互作用，这支持 XPS 结果并证实了后者与羧基的配位。

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

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 ∼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 Ag⁰ and Cd²⁺, supporting the XPS results and confirming the coordination of the latter with carboxyl groups.

更新日期：2024-01-08

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