Fabrication of Bi-Fe3O4@RGO hybrids and their catalytic performance for the reduction of 4-nitrophenol
Fabrication of Bi-Fe3O4@RGO hybrids and their catalytic performance for the reduction of 4-nitrophenol
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DOI：
10.1007/s11051-015-3230-z
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发表时间：
2015-11
影响因子：
2.5
通讯作者：
Xuefang Wang;Fengling Xia;Xichuan Li;Xiaoyang Xu;Huan Wang;Nian Yang;Jian-ping Gao
中科院分区：
文献类型：
--
作者：
Xuefang Wang;Fengling Xia;Xichuan Li;Xiaoyang Xu;Huan Wang;Nian Yang;Jian-ping Gao
纳米催化剂通常与磁性纳米颗粒连接。这些复合材料由于具有磁性，在磁场作用下易于从反应体系中回收。磁性分离在工业上特别有前途，因为它可以解决过滤、离心或重力分离中存在的许多问题。本文以可溶性淀粉为分散剂，制备了负载在还原氧化石墨烯磁性杂化材料（Bi-Fe 3 O 4 @RGO）上的铋和Fe 3 O 4纳米粒子。采用Fe 2+和Fe 3+离子共沉淀法制备了磁性Fe 3 O 4纳米粒子，采用硼氢化钠和柠檬酸铋铵在可溶性淀粉存在下的氧化还原反应制备了Bi纳米粒子。透射电子显微镜图像表明，Fe 3 O 4纳米颗粒的平均直径约为5 nm，Bi纳米颗粒的直径范围为10 ~ 20 nm。磁性Bi-Fe 3 O 4 @RGO杂化物在NaBH 4还原4-硝基苯酚（4-NP）为4-氨基苯酚（4-AP）的反应中表现出高的催化活性，一级反应速率常数（K）为0.00808 s-1，并且磁性可循环至少5次。该策略提供了用于环境保护应用的有效且可回收的催化剂。
Nanocatalysts are frequently connected to magnetic nanoparticles. These composites are easy to be retrieved from the reaction system under a magnetic field because of their magnetic properties. Magnetic separation is particularly promising in industry since it can solve many issues present in filtration, centrifugation, or gravitation separation. Herein, a facile method to prepare bismuth and Fe3O4nanoparticles loaded on reduced graphene oxide magnetic hybrids (Bi-Fe3O4@RGO) using soluble starch as a dispersant is demonstrated. The magnetic Fe3O4nanoparticles were synthesized by the co-precipitation of Fe2+and Fe3+ions, and Bi nanoparticles were fabricated by the redox reactions between sodium borohydride and ammonium bismuth citrate in the presence of soluble starch. Transmission electron microscopy images demonstrate that the average diameter of the Fe3O4nanoparticles is about 5 nm and the diameters of Bi nanoparticles range from 10 to 20 nm. The magnetic Bi-Fe3O4@RGO hybrids exhibit high catalytic activity in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH4with a first-order rate constant (K) of 0.00808 s−1and is magnetically recyclable for at least five cycles. This strategy provides an efficient and recyclable catalyst for the use in environmental protection applications.