赤铁矿
纳米线
单斜晶系
饱和(图论)
氧化铁
磁化
磁场
尿素
氧化物
材料科学
产量(工程)
催化作用
分析化学(期刊)
化学工程
无机化学
纳米技术
化学
物理
结晶学
冶金
晶体结构
数学
量子力学
有机化学
工程类
组合数学
作者
Noorhana Yahya,Bilal Alqasem,Muhammad Irfan,Saima Qureshi,Zia Ur Rehman,Afza Shafie,Hassan Soleimani
标识
DOI:10.1016/j.physb.2016.11.024
摘要
Hematite and cupric oxide nanowires have been synthesized using the oxidation method for green urea production. Hematite nanowires were obtained by the oxidation of an iron wire at a temperature of 650 °C and ambient pressure in the presence of N2 and O2 gases. Cupric oxide nanowires were obtained by the same method at 700 °C, using a copper wire. The X-ray diffraction results show the formation of rhombohedral structure of α-Fe2O3 and monoclinic phase of CuO. FE-SEM results reveal the formation of nanowires with dimensions ranging between 5–15 µm and 4–12 µm in length and a diametere ranging between 50–150 nm and 50–250 nm for α-Fe2O3 and CuO respectively. The VSM results show that the saturation magnetization values for hematite and cupric oxide were 132.8700 and 0.0124 emu/g, respectively. The nanowires were used as catalyst for green urea synthesis in the presence of an oscillating and a static magnetic fields. The use of nanocatalyst with high saturation magnetization gives a higher yield of urea due to the increase in the singlet to triplet conversion. The highest yield of urea 11243 ppm was achieved by applying an oscillating magnetic field of frequency 0.5 MHz and using α-Fe2O3 nanowires as nanocatalyst.
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