Preparation of carbon microspheres decorated with silver nanoparticles and their ability to remove dyes from aqueous solution
Preparation of carbon microspheres decorated with silver nanoparticles and their ability to remove dyes from aqueous solution
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纳米银修饰碳微球的制备及其对水溶液中染料的去除能力
DOI：
10.1016/j.jhazmat.2014.09.024
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发表时间：
2015-02-11
影响因子：
13.6
通讯作者：
Wu, Qingsheng
中科院分区：
文献类型：
--
作者：
Chen, Qingchun;Wu, Qingsheng
以硝酸银和纳米碳微球为原料，通过室温氧化还原反应制备了纳米银修饰碳微球(AgNP-CMSS)，该微球是固体的，但不是中空的或多孔的。用X射线衍射仪、扫描电子显微镜、场发射扫描电子显微镜、拉曼光谱、傅里叶变换红外光谱、紫外-可见光谱等手段对CMSS和AgNP-CMSS进行了表征。虽然AgNP-CMSS的比表面积不高，但在水溶液中对亚甲基蓝(MB)表现出较高的吸附容量。当吸附剂浓度为0.12g/L时，AgNP-CMSS能够在1min内将30 mg/L MB水溶液中的MB全部去除，并且在可见光下对罗丹明B和MB也表现出良好的吸附和光催化活性。用FTIR研究了AgNP-CMSS和MB之间的相互作用，光谱和更多的额外实验表明，阳离子染料和带负电荷的基团之间可以形成离子相互作用，但染料分子和芳香环之间不存在丰富的pi-pi共轭。AgNP-CMSS的光催化活性源于银纳米粒子对CMSS的表面等离子体共振(SPR)效应。(C)2014爱思唯尔B.V.保留所有权利。
Solid, but not hollow or porous, carbon microspheres decorated with silver nanoparticles (AgNP-CMSs) were prepared from silver nitrate and CMSs by a redox reaction at room temperature. The CMSs and AgNP-CMSs were characterized using X-ray diffraction, scanning electron microscopy, field emission scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and UV-vis spectrophotometry. Though with non-high specific surface area, the AgNP-CMSs exhibited a high adsorption capacity toward methylene blue (MB) in an aqueous solution. The AgNP-CMSs were able to remove all the MB from a solution of 30 mg/L MB in water within 1 min when the adsorbent concentration was 0.12 g/L. The AgNP-CMSs also exhibited good adsorption and photocatalytic activity in the decomposition of aqueous Rhodamine B as well as MB under visible light. FTIR was used to examine the interaction between AgNP-CMSs and MB, and the spectrum and more extra experiments suggest ionic interactions between cationic dyes and the negatively charged groups can be formed but not the presence of abundant pi-pi conjugations between dye molecules and the aromatic rings. The origin of the photocatalytic activity of AgNP-CMSs was attributed to a surface plasmon resonance (SPR) effect of the silver nanoparticles on the CMSs. (C) 2014 Elsevier B.V. All rights reserved.