Fabrication of ploydopamine-kaolin supported Ag nanoparticles as effective catalyst for rapid dye decoloration
Fabrication of ploydopamine-kaolin supported Ag nanoparticles as effective catalyst for rapid dye decoloration
复制标题
聚多巴胺-高岭土负载的银纳米颗粒的制备作为快速染料脱色的有效催化剂
DOI：
10.1016/j.chemosphere.2018.12.012
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发表时间：
2019-03-01
期刊：
影响因子：
8.8
通讯作者：
Chen, Guiqiu
中科院分区：
文献类型：
--
作者：
He, Kai;Yan, Ming;Chen, Guiqiu
以聚多巴胺（PDA）为还原剂和稳定剂，采用原位还原法制备了聚多巴胺-高岭土复合物（PDA-kaolin-Ag）负载银纳米粒子。采用透射电子显微镜（TEM）、X射线粉末衍射（XRD）和X射线光电子能谱（XPS）对PDA-高岭土-银复合材料的形貌、组成和结构进行了表征。催化还原实验证实了PDA改性的重要性，并证实了该复合材料对模型染料罗丹明B的高催化活性。催化还原过程符合准一级动力学。同时，该催化剂对染料脱色具有良好的稳定性和可重复使用性。此外，该复合物对亚甲基蓝、甲基橙子和刚果红也表现出良好的催化性能。这些结果表明，PDA-高岭土-银复合材料可以作为一种高效和成本效益的催化剂，用于各种有机染料的脱色。(C)2018爱思唯尔有限公司版权所有
In this work, silver nanoparticles supported on polydopamine-kaolin composite (PDA-kaolin-Ag) was fabricated by an in-situ reduction method with PDA as both reductant and stabilizer. The morphology, composition, and structure of PDA-kaolin-Ag composite were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The catalytic reduction tests confirmed the importance of PDA modification and high catalytic activities of this as-prepared PDA-kaolin-Ag composite towards a model dye Rhodamine B. The catalytic reduction processes followed pseudo-first order kinetics. Meanwhile, this catalyst showed excellent stability and recyclability for dye decoloration. Furthermore, this composite also exhibited good catalytic performance on methylene blue, methyl orange, and Congo red. These results suggest that PDA-kaolin-Ag composites can be used as efficient and cost-effective catalyst for the decoloration of various organic dyes. (C) 2018 Elsevier Ltd. All rights reserved.