CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China; Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China; NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China; Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China.
J Colloid Interface Sci. 2018 Sep 15;526:1-8. doi: 10.1016/j.jcis.2018.04.094. Epub 2018 Apr 25.
More discrete and active Ag nanoparticles (Ag NPs) were fabricated by decorating them on the surface of magnetic nanoparticles encapsulated in carbonized polydopamine nanospheres (M/C-PDA/Ag) via in-situ solid-state decomposition process. The morphology, structure, surface compositions and textural properties of the M/C-PDA and M/C-PDA/Ag catalyst were characterized. The results revealed a dispersion of Ag NPs with average particle size of less than 50 nm on C-PDA nanospheres uniformly embedded with FeC NPs of only 3-5 nm in size. With the synergistic effect of Ag NPs, nitrogen doping, and hierarchical mesopores, M/C-PDA/Ag displayed a superior catalytic capability for catalytic reduction of toxic Cr(VI) to less-toxic Cr(III) by formic acid as a reductant. Moreover, M/C-PDA/Ag maintained good physicochemical structure and stable activity even after several cycles of reactions. According to the results, the simple synthetic strategy, good stability, highly catalytic activity, and easy magnetic separation property of M/C-PDA/Ag hybrid make it serve as a promising environmentally friendly catalyst for the elimination of Cr(VI).
通过原位固态分解法，将其修饰在碳化聚多巴胺纳米球（M/C-PDA）封装的磁性纳米颗粒表面上，制备了更离散、更活跃的 Ag 纳米颗粒（Ag NPs）。对 M/C-PDA 和 M/C-PDA/Ag 催化剂的形貌、结构、表面组成和结构性质进行了表征。结果表明，Ag NPs 在 C-PDA 纳米球上均匀分散，平均粒径小于 50nm，而 FeC NPs 的尺寸仅为 3-5nm。M/C-PDA/Ag 具有 Ag NPs 的协同作用、氮掺杂和分级介孔，在甲酸作为还原剂时，对有毒 Cr(VI)的催化还原具有优异的催化性能，生成毒性较小的 Cr(III)。此外，即使经过多次反应循环，M/C-PDA/Ag 仍保持良好的物理化学结构和稳定的活性。根据研究结果，M/C-PDA/Ag 杂化物的简单合成策略、良好的稳定性、高催化活性和易于磁分离的特性，使其成为一种很有前途的环保型催化剂，可用于消除 Cr(VI)。
