Synthesis of pyranopyrazole derivative compounds with nano-Fe3O4 catalyst

2021 ◽  
Author(s):  
A. H. Cahyana ◽  
A. Mufidah
Keyword(s):  
Nano Fe3o4

Synthesis of Chalcone Derivatives by Phthalhydrazide-Functionalized TiO2-Coated Nano-Fe3O4 as a New Heterogeneous Catalyst

2020 ◽  
Vol 17 ◽  
Author(s):  
Forough Motamedi Nia ◽  
Mahnaz Farahi ◽  
Bahador Karami ◽  
Raziyeh Keshavarz
Keyword(s):  
Heterogeneous Catalyst ◽  
Significant Loss ◽  
Magnetic Nanocatalyst ◽  
Chalcone Derivatives ◽  
Ft Ir ◽  
Nano Fe3o4

Abstract:: Phthalhydrazide immobilized on TiO2-coated nano Fe3O4 (Fe3O4-P) was synthesized and characterized by FT-IR, XRD, SEM, EDS and VSM analysis. The resulting magnetic nanocatalyst was used as a catalyst for the synthesis of chalcone derivatives which affords the desired products in good to excellent yields. This catalyst can be isolated readily after completion of the reaction by an external magnetite field and reused several times without significant loss of activity.

scholarly journals Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 103
Author(s):  
Xiaoming Song ◽  
Yuewen Zhang ◽  
Nan Cao ◽  
Dong Sun ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Microwave Treatment ◽  
Contaminated Groundwater ◽  
Maximum Adsorption Capacity ◽  
Intraparticle Diffusion Model ◽  
Adsorption Mechanisms ◽  
Chromium Vi ◽  
Modified Biochar ◽  
Pseudo Second Order ◽  
Nano Fe3o4

This study developed a nano-magnetite-modified biochar material (m-biochar) using a simple and rapid in situ synthesis method via microwave treatment, and systematically investigated the removal capability and mechanism of chromium (VI) by this m-biochar from contaminated groundwater. The m-biochar was fabricated from reed residues and magnetically modified by nano-Fe3O4. The results from scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterisations confirmed the successful doping of nano-Fe3O4 on the biochar with an improved porous structure. The synthesised m-biochar exhibited significantly higher maximum adsorption capacity of 9.92 mg/g compared with that (8.03 mg/g) of the pristine biochar. The adsorption kinetics followed the pseudo-second-order model and the intraparticle diffusion model, which indicated that the overall adsorption rate of Cr(VI) was governed by the processes of chemical adsorption, liquid film diffusion and intramolecular diffusion. The increasing of the pH from 3 to 11 significantly affected the Cr(VI) adsorption, where the capabilities decreased from 9.92 mg/g to 0.435 mg/g and 8.03 mg/g to 0.095 mg/g for the m-biochar and pristine biochar, respectively. Moreover, the adsorption mechanisms of Cr(VI) by m-biochar were evaluated and confirmed to include the pathways of electrostatic adsorption, reduction and complexation. This study highlighted an effective synthesis method to prepare a superior Cr(VI) adsorbent, which could contribute to the effective remediation of heavy metal contaminations in the groundwater.

A novel microwave induced oil release pattern of calcium alginate/ nano-Fe3O4 composite capsules for asphalt self-healing

2021 ◽  
pp. 126721
Author(s):  
Pei Wan ◽  
Quantao Liu ◽  
Shaopeng Wu ◽  
Zenggang Zhao ◽  
Shuaichao Chen ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Self Healing ◽  
Release Pattern ◽  
Nano Fe3o4

scholarly journals Structural evolution of cement paste with nano-Fe3O4 under magnetic field - Effect of concentration and particle size of nano-Fe3O4

2021 ◽  
Vol 120 ◽  
pp. 104036
Author(s):  
Dengwu Jiao ◽  
Karel Lesage ◽  
Mert Yucel Yardimci ◽  
Khadija El Cheikh ◽  
Caijun Shi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Cement Paste ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Structural Evolution ◽  
Nano Fe3o4

Effects of Fe3O4 Nano Particles Addition in High Temperature Superconductor YBa2Cu3O7-δ

2012 ◽  
Vol 501 ◽  
pp. 309-313 ◽  
Author(s):  
Siti Nurdalila Abd-Ghani ◽  
Roslan Abd-Shukor ◽  
Wei Kong
Keyword(s):  
Transport Properties ◽  
Solid State Reaction Method ◽  
Nano Particles ◽  
Magnetic Impurities ◽  
Oxide Powders ◽  
Nano Fe3o4 ◽  
Activated Flux ◽  
Average Size ◽  
Increasing Temperature ◽  
Magnetic Nano Particles

The effects of nano particles Fe3O4 addition on the superconducting and transport properties of YBa2Cu3O7-δ (YBCO) were studied. YBa2Cu3O7-δ superconductor powders were prepared by using high purity oxide powders via solid state reaction method. Nano Fe3O4 with 0.01 – 0.05 wt.% with average size 28 nm was added into YBCO. The transition temperatures (Tc) of the samples were measured by using four point probe method. The critical current (Ic) of the samples has been determined by using the 1 μV/cm criterion from 30 – 77 K. Sample with 0.02 wt.% nano Fe3O4 showed the highest Tc at 87 K. It is interesting to note the same sample also exhibited the highest Jc at 77 K up to 1683 mA/cm2. Nano Fe3O4 has acted as effective flux pinning centers in YBCO. A small amount of nano particles Fe3O4 addition has successfully improved the superconducting and transport properties of YBCO. The excessive addition of nano Fe3O4 (> 0.02 wt.%) suppressed the Tc and Jc. Overall, Jc decreases with increasing temperature (30 – 77 K) as a consequence of thermally activated flux creep. Magnetic impurities normally suppress superconductivity. However, by adding magnetic nano particles, current carrying capacity of superconductors YBCO was enhanced significantly.

ChemInform Abstract: Nano Fe3O4 as Magnetically Recyclable Catalyst for the Synthesis of α-Aminophosphonates in Solvent-Free Conditions.

ChemInform ◽  
2011 ◽  
Vol 42 (26) ◽  
pp. no-no
Author(s):  
B. V. Subba Reddy ◽  
A. Siva Krishna ◽  
A. V. Ganesh ◽  
G. G. K. S. Narayana Kumar
Keyword(s):  
Recyclable Catalyst ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Nano Fe3o4 ◽  
Magnetically Recyclable Catalyst
Sign in / Sign up

Export Citation Format

Share Document