scholarly journals Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties

2021 ◽  
Author(s):  
xiaoping wu ◽  
Lin Cheng ◽  
Chang-Sheng Song ◽  
Yi-Zhe Zhang ◽  
Xiao-Jing Shi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Magnetic Nanoparticles ◽  
Solvothermal Method ◽  
Hollow Spheres ◽  
High Capacity ◽  
Hollow Structure ◽  
Magnetic Composite ◽  
Ion Removal ◽  
Carbon Coated ◽  
Facile Solvothermal Method

Abstract Here, a facile solvothermal method coupled with an annealing strategy is developed to synthesize Fe3O4/carbon (Fe3O4@C) magnetic composite microstructures with different morphologies, including flower-like, hollow spheres and egg-like. Owing to the unique multi-porous and hollow structure, the as-prepared hierarchical Fe3O4@C hollow microspheres composite exhibit appealing performance as an absorbent of Cr(VI) ions in aqueous solution, delivering a high capacity of ca.197.2mg/g. Furthermore, the magnetic Fe3O4 ‘‘core’’ in composite hierarchical microstructures makes them easy to separate from aqueous systems by magnetic separation, the layer of carbon effectively prevents agglomerations of magnetic nanoparticles and expands their range of applications. The excellent Cr(VI) ions adsorbent activities of the Fe3O4@C magnetic composite microstructures would have a potential adsorbing material application in environmental purification.

Hollow sphere structured V2O3@C as an anode material for high capacity potassium-ion batteries

2020 ◽  
Vol 8 (26) ◽  
pp. 13261-13266 ◽  
Author(s):  
Fei Chen ◽  
Shuo Wang ◽  
Xiao-Dong He ◽  
Jia-Ying Liao ◽  
Qiao Hu ◽  
...  
Keyword(s):  
Anode Material ◽  
Volume Change ◽  
Hollow Sphere ◽  
Carbon Coating ◽  
Electronic Conductivity ◽  
Hollow Spheres ◽  
High Capacity ◽  
Hollow Structure ◽  
Rate Performance ◽  
Carbon Coated

Carbon-coated V2O3 hollow spheres are synthesized by a solvothermal route, with promising cycling stability and rate performance for PIBs. The homogeneous carbon coating improves the electronic conductivity and the hollow structure buffers the volume change during cycling.

Facile Solvothermal Method to Synthesis Eu Doped TiO2 Hollow Microspheres with Enhanced Photoluminescence

2013 ◽  
Vol 634-638 ◽  
pp. 2198-2202
Author(s):  
Jian Dong Zhuang ◽  
Hu Zhou ◽  
Qian Liu
Keyword(s):  
Solvothermal Method ◽  
Hollow Spheres ◽  
Hollow Structure ◽  
Europium Nitrate ◽  
Solvothermal Process ◽  
Uniform Size ◽  
Enhanced Photoluminescence ◽  
Facile Solvothermal Method ◽  
Calcination Treatment

Eu doped TiO2 powders have been prepared by the solvothermal process followed by calcination treatment. The furfural and dodecylamine assisted solvothermal method is a very simple way of fabricating porous TiO2 hollow spheres due to in situ hydrolysis and a self-assembled effect. By adding europium nitrate into the precursoSubscript textr solution, Eu-doped TiO2 hollow spheres with an intense photoluminescence were easily obtained. The stronger photoluminescence of Eu-doped TiO2 hollow sample can be attributed to the unique microstructures, such as uniform size distribution and the broken hollow structure, compared to solid Eu-TiO2 sample.

Preparation of hollow Fe3O4 spheres through a facile method and their applications

2017 ◽  
Vol 10 (06) ◽  
pp. 1750075 ◽  
Author(s):  
Xingping Wu ◽  
Aiping Zhu ◽  
Zhaodong Nan
Keyword(s):  
Saturation Magnetization ◽  
Ostwald Ripening ◽  
Solvothermal Method ◽  
Hollow Spheres ◽  
Hollow Structure ◽  
Solid Sphere ◽  
Small Particles ◽  
Potential Applications ◽  
One Step ◽  
Solid Spheres

Fe3O4 hollow microspheres with good dispersibility and high saturation magnetization were synthesized through a facile one-step solvothermal method. The formation mechanism of the hollow structure was studied by taking time-dependent experiments. Porous [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3 nanosheets were firstly fabricated. Fe3O4 solid spheres aggregated by small particles were obtained from the transition of [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3. Finally, the solid sphere is transferred to hollow sphere through Ostwald ripening. The maximum saturation magnetization of the hollow spheres is [Formula: see text][Formula: see text]emu/g, which is higher than some results reported in references. The Fe3O4 hollow spheres show potential applications in microwave absorption and photocatalysis.

Solvothermal Synthesis and Luminescence Properties of Gd2O2S:RE3+ (RE3+=Eu3+/Tb3+) Hollow Sphere

2019 ◽  
Vol 807 ◽  
pp. 1-10 ◽  
Author(s):  
Guang Xi Xu ◽  
Xiao Tong Sang ◽  
Jing Bao Lian ◽  
Nian Chu Wu ◽  
Xue Zhang
Keyword(s):  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Raw Materials ◽  
Hollow Spheres ◽  
Hollow Structure ◽  
Molar Ratio ◽  
Detailed Characterization ◽  
X Ray ◽  
Electronic Microscope

Eu3+ and Tb3+ ions singly activated Gd2O2S hollow spheres have been successfully synthesized via solvothermal method by using Gd (NO3)3, Eu (NO3)3, Tb (NO3)3 and thiourea as raw materials. Detailed characterization of the as-prepared samples were obtained by X-ray diffractometry (XRD), field emission scanning electron microscopy (FE-SEM), transmission electronic microscope (TEM) and photoluminescence (PL) spectroscopy. The results demonstrate that at 220 oC for 24 h, the molar ratio of thiourea/Gd3+ has no significant impact on the phase composition of Gd2O2S products. With the reaction time increased from 6 h to 24 h, the morphology of Gd2O2S samples changed from ellipsoidal to near-spheroidal structure, but still remained hollow structure. PL results show that the strongest emission peaks for Gd2O2S:Eu3+ and Gd2O2S:Tb3+ samples were centered at 625 nm and 545 nm, corresponding to the 5D0→7F2 transition of Eu3+ ions and 5D4→7F5 transition of Tb3+ ions, respectively. The quenching concentrations for Eu3+ and Tb3+ ions were 12% and 6%, which can be attributed to the exchange interaction for Eu3+ and Tb3+ ions, respectively.

Phenylboronic acid-functionalized core–shell magnetic composite nanoparticles as a novel protocol for selective enrichment of fructose from a fructose–glucose aqueous solution

2017 ◽  
Vol 41 (22) ◽  
pp. 13399-13407 ◽  
Author(s):  
Lei Gu ◽  
Yun Wang ◽  
Juan Han ◽  
Lei Wang ◽  
Xu Tang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Magnetic Nanoparticles ◽  
Boronic Acid ◽  
Phenylboronic Acid ◽  
Sample Solution ◽  
Core Shell ◽  
Magnetic Composite ◽  
Selective Enrichment ◽  
Functionalized Magnetic Nanoparticles ◽  
First Time

We developed an efficient and mild method for the preparation of boronic acid-functionalized magnetic nanoparticles (MNPs), and the selective separation of fructose from a sample solution was demonstrated for the first time.

Solvothermal Synthesis of TiO2 Hollow Microsphere and Its Photocatalytic Properties

2011 ◽  
Vol 356-360 ◽  
pp. 345-348
Author(s):  
Jin Guo Wang ◽  
Jian Zhu ◽  
Xi Li ◽  
He Xing Li
Keyword(s):  
Photocatalytic Activity ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Uv Light ◽  
Hollow Structure ◽  
Hollow Microsphere ◽  
Hollow Microspheres ◽  
Photocatalytic Properties ◽  
Multiple Reflections ◽  
Facile Solvothermal Method

TiO2hollow microspheres were synthesized by a facile solvothermal method. The prepared samples were characterized by the XRD, SEM, TEM, BET and UV-vis. The results showed that the TiO2hollow microspheres offered an enhanced photocatalytic activity due to the multiple reflections of the UV light within the inner hollow structure.

Solvothermal synthesis of flower-like CoS hollow microspheres with excellent microwave absorption properties

RSC Advances ◽  
2016 ◽  
Vol 6 (102) ◽  
pp. 100392-100400 ◽  
Author(s):  
Tingyuan Huang ◽  
Man He ◽  
Yuming Zhou ◽  
Shiwei Li ◽  
Binbin Ding ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Hollow Spheres ◽  
Hollow Microspheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbers ◽  
Facile Solvothermal Method

In this study, flower-like CoS hollow spheres (CHSs), synthesized via a facile solvothermal method in the presence of CTAB, were initially investigated as microwave absorbers.

Highly efficient adsorption of uranium(vi) from aqueous solution by a novel adsorbent: titanium phosphate nanotubes

2018 ◽  
Vol 5 (10) ◽  
pp. 2304-2314 ◽  
Author(s):  
Mengling Tang ◽  
Juan Chen ◽  
Peifang Wang ◽  
Chao Wang ◽  
Yanhui Ao
Keyword(s):  
Aqueous Solution ◽  
High Performance ◽  
Solvothermal Method ◽  
Titanium Phosphate ◽  
Highly Efficient ◽  
Facile Solvothermal Method

A novel adsorbent (titanium phosphate nanotube) with high performance for U(vi) adsorption was fabricated through a facile solvothermal method.

Triple-shelled NiMn2O4 hollow spheres as an efficient catalyst for low-temperature selective catalytic reduction of NOx with NH3

2018 ◽  
Vol 54 (70) ◽  
pp. 9797-9800 ◽  
Author(s):  
Yanling Han ◽  
Jincheng Mu ◽  
Xinyong Li ◽  
Jinsuo Gao ◽  
Shiying Fan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Solvothermal Method ◽  
Catalytic Reduction ◽  
Hollow Spheres ◽  
Efficient Catalyst ◽  
Reduction Of Nox ◽  
Facile Solvothermal Method

Unique triple-shelled NiMn2O4 hollow spheres are fabricated by a facile solvothermal method.

scholarly journals REMOVAL OF LEAD (Pb2+) IONS FROM AQUEOUS SOLUTION BY ADSORPTION USING SUGARCANE BAGASSE ACTIVATED CARBON COATED WITH MAGNETIC NANOPARTICLES

2020 ◽  
Vol 4 (2) ◽  
pp. 401-408
Author(s):  
Abdullahi Muhammad ◽  
S. Y. Sati ◽  
A. H. Usman
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Magnetic Nanoparticles ◽  
Sugarcane Bagasse ◽  
Contact Time ◽  
Chemical Activation ◽  
Lead Ion ◽  
Neutral Medium ◽  
Vis Spectroscopy ◽  
Carbon Coated

An experiment to remove lead (II) ions through adsorption from its aqueous solution   using Sugarcane Bagasse Activated carbon (SBAC) was carried out. As one of the ways employ to reduce the high cost of treatment of industrial effluents.  Agricultural wastes could be considered as suitable material for the production of Activated Carbon due it high carbon contents, environmentally friendly and low cost of production. In this work, activated carbon was produced by chemical activation with sulphuric acid (H2SO4) of sugarcane bagasse materials. It was then coated with magnetic nanoparticle (Fe3O4) prepared by chemical precipitation of Fe2+ and Fe3+ salt from aqueous solution   and tested for its efficiency as an adsorbent for the removal of Lead(II) ion from aqueous solution .The surface morphology, structural and functional groups present were investigated using scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectroscopy. Shift and disappearance of some adsorption bands in the sugarcane bagasse activated carbon coated with magnetic nanoparticles testify the formation of the composite.  Optical properties were determined using UV Vis spectroscopy shows a wavelength ( of 400nm. Adsorption parameters such as effect of pH, contact time, initial concentration of Lead ion and adsorbent dosage were studied. Neutral medium was the optimum pH condition needed for the removal of lead with the percentage removal efficiency of 91%. It was found to be highly efficient at 0.4g of the dosage and at contact time of 60 minutes. This sugarcane bagasse is useful in adsorbing heavy metal in an aqueous solution

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