Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura, Ramanagaram, Bangalore 562112, India.
Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India.
J Environ Sci (China). 2021 Mar;101:189-204. doi: 10.1016/j.jes.2020.08.015. Epub 2020 Sep 1.
In this paper, highly stable, powerful, and recyclable magnetic nanoparticles tethered N-heterocyclic carbene-palladium(II) ((CH)-NHC-Pd@FeO) as magnetic nanocatalyst was successfully synthesized from a simplistic multistep synthesis under aerobic conditions through easily available low-cost chemicals. Newly synthesized (CH)-NHC-Pd@FeO magnetic nanocatalyst was characterized from various analytical tools and catalytic potential of the (CH)-NHC-Pd@FeO magnetic nanocatalyst was studied for the catalytic reduction of toxic 4-nitrophenol (4-NP), hexavalent chromium (Cr(VI)), Methylene Blue (MB) and Methyl Orange (MO) at room temperature in aqueous media. UV-Visible spectroscopy was employed to monitor the reduction reactions. New (CH)-NHC-Pd@FeO magnetic nanocatalyst exhibited excellent catalytic activity for the reduction of toxic environmental pollutants. Moreover, (CH)-NHC-Pd@FeO magnetic nanocatalyst could be easily and rapidly separated from the reaction mixture with the help of an external magnet and recycled minimum five times in reduction of 4-NP, MB, MO and four times in Cr(VI) without significant loss of catalytic potential and remains stable even after reuse.
本文通过简便的多步合成，在有氧条件下，以易得、低成本的化学物质成功合成了高度稳定、高效、可回收的磁性纳米粒子固载 N-杂环卡宾-钯(II)（(CH)-NHC-Pd@FeO）作为磁性纳米催化剂。通过各种分析工具对新合成的(CH)-NHC-Pd@FeO 磁性纳米催化剂进行了表征，并研究了其在水相介质中，室温下催化还原有毒的 4-硝基苯酚（4-NP）、六价铬（Cr(VI)）、亚甲基蓝（MB）和甲基橙（MO）的催化性能。采用紫外-可见光谱监测还原反应。新型(CH)-NHC-Pd@FeO 磁性纳米催化剂对有毒环境污染物的还原表现出优异的催化活性。此外，在还原 4-NP、MB、MO 时，(CH)-NHC-Pd@FeO 磁性纳米催化剂可在外磁场的帮助下，从反应混合物中轻松快速地分离出来，并可重复使用五次以上，而催化活性没有明显损失，并且即使在重复使用后仍然稳定。在 Cr(VI) 的还原中，(CH)-NHC-Pd@FeO 磁性纳米催化剂可重复使用四次。
