direct precipitation method
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2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Bai-Lin Xiang ◽  
Lin Fu ◽  
Yongfei Li ◽  
Yuejin Liu

The metal-organic framework MOF-5 was synthesized by self-assembling of Zn(NO3)2·7H2O and H2BDC using DMF as solvent by the direct precipitation method and loaded with Fe2+ by the equivalent loading method at room temperature to prepare Fe(II)/MOF-5 catalyst and the microstructure, phases, and pore size of which was characterized by IR, XRD, SEM, TEM, and BET. It was found that Fe(II)/MOF-5 had high specific surface and porosity like MOF-5 and uniform pore distribution, and the pore size is 1.2 nm. In order to study the catalytic activity and reaction conditions of Fe(II)/MOF-5, it was used to catalyze the hydroxylation reaction of phenol with hydrogen peroxide. The results showed that the dihydroxybenzene yield of 53.2% and the catechol selectivity of 98.6% were obtained at the Fe2+ content of 3 wt.%, the mass ratio of Fe(II)/MOF-5 to phenol of 0.053, the reaction temperature of 80°C, and the reaction time of 2 h.


2018 ◽  
Vol 32 (19) ◽  
pp. 1850215
Author(s):  
Yu-Shan Qin ◽  
Qi Shi ◽  
Yu-Guang Lv ◽  
Chen-Xi Shi ◽  
Ya-Xin Zhao ◽  
...  

In this paper, Ag–Ce–ZnO nanocomposites with average particle size of about 50 nm were prepared by direct precipitation method. In order to solve the problem of agglomeration, the nanocomposites with the average particle size of about 30 nm were obtained by treating the nanocomposites with surfactant sodium polyacrylate (PAAS). The effect of surfactant PAAS on the content of hydroxyl radicals produced by nanocomposites was determined by UV spectrophotometry and fluorescence spectrophotometry, and the effect of PAAS on the dispersion effect was obtained indirectly. The experimental results showed that the addition of surfactants’ PAAS effectively reduced the average particle size of nanocomposites, increased the content of hydroxyl radicals, and made the nanocomposites have good dispersing effect.


2017 ◽  
Vol 108 ◽  
pp. 02003
Author(s):  
Mingyu Li ◽  
Kefu Ding ◽  
Zhihao Li ◽  
Zeng Qingxuan

2016 ◽  
Vol 19 (3) ◽  
pp. 117-119 ◽  
Author(s):  
Jianzhi Sun ◽  
Yan Dong ◽  
Chunyan Kong

Prussian Blue type Na2MnFe(CN)6 was prepared by direct precipitation method and a subsequent drying procedure as a cath-ode material for aqueous rechargeable sodium-ion batteries. XRD patterns showed that Na2MnFe(CN)6 has a typical Prussian Blue struc-ture with space group Fm3m. Na2MnFe(CN)6 presents good electrochemical behaviors at 10 mAg-1 discharge current density with specific capacity 73.1 mAhg-1 after 30 cycles. The results show that Na2MnFe(CN)6 could be a potential cathode material for aqueous Sodium-ion battery.


2016 ◽  
Vol 40 (9) ◽  
pp. 7911-7916 ◽  
Author(s):  
Hongxia Peng ◽  
Xiang Wang ◽  
Chuanyue Hu ◽  
Jilin Hu ◽  
Xiuying Tian

We prepared Fe3O4@MgO nanoparticles with magnetic and microwave to heat responsive properties by a direct precipitation method.


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