Hoijang Supawitch, Kunakham Tanapong, Nonkumwong Jeeranan, Ananta Supon, Srisombat Laongnuan
Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand.
Langmuir. 2024 Mar 26;40(12):6261-6271. doi: 10.1021/acs.langmuir.3c03780. Epub 2024 Mar 15.
Surface deposition of magnesium ferrite nanoparticles (MgFeO NPs) with bimetallic gold/silver (Au/Ag) nanoparticles was conducted using the seed-mediated growth method to obtain magnetic-metallic composite catalysts for use in the catalytic reduction of nitroaromatics. Two types of amine-functionalized MgFeO and MgFeO@SiO NPs were used as magnetic supports for the surface deposition process. The combination of several characterization analyses (i.e., XRD, XPS, TEM, SEM, EDS, and VSM) confirmed the successful syntheses of the MgFeO/Au/Ag and MgFeO@SiO/Au/Ag NPs. The catalytic reduction of 4-nitrophenol using sodium borohydride as a reducing agent revealed that the reaction was completed within 2 min by using MgFeO/Au/Ag and MgFeO@SiO/Au/Ag NPs as catalysts. The appearance rate constant of the MgFeO/Au/Ag NPs was slightly higher than that of the MgFeO@SiO/Au/Ag NPs. In terms of reusability, high conversion (>80%) of the reduction of 4-nitrophenol was still obtained after 7 and 10 consecutive cycles for the MgFeO/Au/Ag and MgFeO@SiO/Au/Ag catalysts, respectively. Interestingly, these two catalysts exhibited the highly catalytic conversion of the chosen nitroaromatic derivatives (i.e., 4-nitrobenzaldehyde and 4-nitroaniline). On the whole, the MgFeO/Au/Ag and MgFeO@SiO/Au/Ag NPs could be utilized as suitable and sustainable catalysts for the catalytic reduction of nitroaromatics due to several desirable features (i.e., high activity, facile and rapid separation by a magnet, and good reusability).
采用种子介导生长法在镁铁氧体纳米颗粒（MgFeO NPs）表面沉积双金属金/银（Au/Ag）纳米颗粒，以获得用于催化还原硝基芳烃的磁性金属复合催化剂。两种类型的胺官能化MgFeO和MgFeO@SiO NPs用作表面沉积过程的磁性载体。多种表征分析（即XRD、XPS、TEM、SEM、EDS和VSM）相结合，证实成功合成了MgFeO/Au/Ag和MgFeO@SiO/Au/Ag NPs。以硼氢化钠作为还原剂催化还原4-硝基苯酚的实验表明，使用MgFeO/Au/Ag和MgFeO@SiO/Au/Ag NPs作为催化剂时，反应在2分钟内完成。MgFeO/Au/Ag NPs的表观速率常数略高于MgFeO@SiO/Au/Ag NPs。在可重复使用性方面，MgFeO/Au/Ag和MgFeO@SiO/Au/Ag催化剂分别在连续7次和10次循环后，仍能实现4-硝基苯酚还原的高转化率（>80%）。有趣的是，这两种催化剂对所选的硝基芳烃衍生物（即4-硝基苯甲醛和4-硝基苯胺）表现出高催化转化率。总体而言，MgFeO/Au/Ag和MgFeO@SiO/Au/Ag NPs由于具有多种理想特性（即高活性、通过磁铁易于快速分离以及良好的可重复使用性），可作为催化还原硝基芳烃的合适且可持续的催化剂。
