School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.
CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Guangzhou, 510640, China.
Environ Sci Pollut Res Int. 2021 Feb;28(6):6411-6421. doi: 10.1007/s11356-020-10900-2. Epub 2020 Sep 29.
In this work, various photocatalysts were synthesized with an impregnation-precipitation process to in situ decorate Ag-based nanoparticles (NPs, including AgPO, AgCl, AgO, and AgCO) on the cellulosic paper. The structure and properties of the Ag-based composites were characterized by scanning electron microscopy, X-ray diffraction, transmitting electron microscopy, UV-vis diffuse reflectance spectra, and photocatalysis testing. The results showed that cellulosic paper is an efficient carrier which is feasible to grasp NPs due to the cellulosic nanofiber-network microstructure. Among the obtained samples, AgCO and AgCl NPs on cellulosic paper displayed high photocatalytic activity for the degradation of methyl orange under ultraviolet and visible light. However, photo lability of AgCO limits its recyclable. AgCl showed a better reutilization with the assistance of a surface plasmon resonance effect by Ag NPs that were grown in situ on the AgCl NPs, which formed Ag@AgCl nanocomposite structure. The photocatalytic activity of the AgCl/cellulosic paper decreased only slightly after three runs of photodegradation of methyl orange. The possible mechanism for photocatalysis was proposed. This work may provide a new method for the design of silver-based NPs/cellulosic paper nanocomposite photoreactors with favorable photocatalytic activities for industrial applications.
在这项工作中，采用浸渍沉淀法合成了各种光催化剂，将基于银的纳米颗粒（包括 AgPO、AgCl、AgO 和 AgCO）原位修饰在纤维素纸上。通过扫描电子显微镜、X 射线衍射、透射电子显微镜、紫外-可见漫反射光谱和光催化测试对基于银的复合材料的结构和性能进行了表征。结果表明，由于纤维素纳米纤维网络的微观结构，纤维素纸是一种有效的载体，可以有效地固定纳米颗粒。在所得到的样品中，纤维素纸上的 AgCO 和 AgCl NPs 在紫外光和可见光下对甲基橙的降解表现出高的光催化活性。然而，AgCO 的光不稳定性限制了其可回收性。AgCl 在原位生长在 AgCl NPs 上的 Ag NPs 的表面等离子体共振效应的辅助下表现出更好的可重复利用性，形成了 Ag@AgCl 纳米复合材料结构。AgCl/纤维素纸在三次甲基橙光降解后，光催化活性仅略有下降。提出了可能的光催化机制。这项工作可能为设计具有工业应用价值的基于银的 NPs/纤维素纸纳米复合材料光反应器提供一种新方法，该光反应器具有良好的光催化活性。
