Fe3o4 Lab Report
In this work, the Fe3O4 NPs were synthesized by a co-precipitation method. The prepared Fe3O4 particles were dispersed well in water and stay stable for several days. FT-IR spectra of Fe3O4, mercaptosuccinic acid and mercaptosuccinic acid functionalized Fe3O4 are shown in Figure 1(a-c), respectively. In Figure 1a, the sharp band at about 585 cm-1 corresponds to the characteristic Fe–O vibration peak and the bands at around 3420 cm-1 are due to the stretching vibrations of the hydroxyls (–OH) on the surface of the Fe3O4. In Figure 1c, the
S-H stretching vibrations of mercaptosuccinic acid appears in 2800 cm−1، C-H stretching vibrations appears in 2880 cm−1 and C-S appears in 1450 cm−1. This indicated that the mercaptosuccinic acid was successfully …show more content…
In the first step, Fe3O4 NPs were prepared from the co-precipitation method (a). In the second step, immobilization and solubilization were performed by sonicating the mixture of Fe3O4 and mercaptosuccinic acid in water (b). Thirdly, Pd2+ and Ni2+ ions attached on to the surfaces of the Fe3O4 spheres by using the interaction between the S-H groups of the mercaptosuccinic acid and the metal ions and self-assembled (c). In the next step, the growing process initiated by the addition of NaBH4 (d), and Pd-Ni/Fe3O4 core-shell structures were made after crystal growing …show more content…
Catalytic performance of different catalysts in the coupling of bromobenzene and phenylboronic acid
# Catalyst Solvent Base Temp
(°C) Time
(h) Yields
(%) Ref
1 Pd1Ni2 DMF NaOH 140 10 93.8 [58]
2 C/CuPd EtOH K₂CO₃ 60 5 91 [59]
3 Pd/RGOa H2O K₂CO₃ 80 0.5 95 [42]
4 Pd thin film H2O K₂CO₃ 80 1.5 90 [42]
5 Pd-DS-LDHb DMF-H2O K₂CO₃ 80 5 82 [60]
6 Pd-Ni/Fe3O4 EtOH K₂CO₃ 80 0.5 95 This work
a Reduced-graphene oxide; b DS: Dodecylsulfate anion, LDH: Layered double hydroxide.
Since the catalyst can be separated from the reaction mixture using external magnetic field, therefore it recovered with a simple magnet after dilution of the reaction mixture with CH2Cl2. The results exhibited that the catalyst can be reused at least for six consecutive cycles without noticeable losing activity (Figure 5). Figure 5. Reusability of Pd-Ni@Fe3O4 core-shell catalyst in the synthesis of biphenyl from bromobenzene and phenylboronic acid at 80 °C in
S-H stretching vibrations of mercaptosuccinic acid appears in 2800 cm−1، C-H stretching vibrations appears in 2880 cm−1 and C-S appears in 1450 cm−1. This indicated that the mercaptosuccinic acid was successfully …show more content…
In the first step, Fe3O4 NPs were prepared from the co-precipitation method (a). In the second step, immobilization and solubilization were performed by sonicating the mixture of Fe3O4 and mercaptosuccinic acid in water (b). Thirdly, Pd2+ and Ni2+ ions attached on to the surfaces of the Fe3O4 spheres by using the interaction between the S-H groups of the mercaptosuccinic acid and the metal ions and self-assembled (c). In the next step, the growing process initiated by the addition of NaBH4 (d), and Pd-Ni/Fe3O4 core-shell structures were made after crystal growing …show more content…
Catalytic performance of different catalysts in the coupling of bromobenzene and phenylboronic acid
# Catalyst Solvent Base Temp
(°C) Time
(h) Yields
(%) Ref
1 Pd1Ni2 DMF NaOH 140 10 93.8 [58]
2 C/CuPd EtOH K₂CO₃ 60 5 91 [59]
3 Pd/RGOa H2O K₂CO₃ 80 0.5 95 [42]
4 Pd thin film H2O K₂CO₃ 80 1.5 90 [42]
5 Pd-DS-LDHb DMF-H2O K₂CO₃ 80 5 82 [60]
6 Pd-Ni/Fe3O4 EtOH K₂CO₃ 80 0.5 95 This work
a Reduced-graphene oxide; b DS: Dodecylsulfate anion, LDH: Layered double hydroxide.
Since the catalyst can be separated from the reaction mixture using external magnetic field, therefore it recovered with a simple magnet after dilution of the reaction mixture with CH2Cl2. The results exhibited that the catalyst can be reused at least for six consecutive cycles without noticeable losing activity (Figure 5). Figure 5. Reusability of Pd-Ni@Fe3O4 core-shell catalyst in the synthesis of biphenyl from bromobenzene and phenylboronic acid at 80 °C in