scholarly journals Preparation, Characterization, and Photocatalytic Properties of Modified Red Mud

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Mingjie Ma ◽  
Guanyu Wang ◽  
Zhengpeng Yang ◽  
Shanxiu Huang ◽  
Weijie Guo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Uv Irradiation ◽  
Red Mud ◽  
Structure Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrf Scanning ◽  
Scanning Electron

Solid waste red mud was modified by HCl leaching. The structure property and composition of modified red mud were investigated by X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET). Under UV irradiation, methyl orange (MO) aqueous solution was photodegraded by modified red mud. The obtained results showed that the specific surface area of modified red mud was 317.14 m2/g, which was about 40 times higher than that of the normal red mud. After UV irradiation for 50 min, the removal percentage of MO reached 94.2%. The study provided a novel way for the application of red mud to the photocatalytic degradation of organic wastes.

Hydrothermal Synthesis of SrSO4:Eu2+ Microcrystals with Different Morphologies and its Luminescence Properties

2014 ◽  
Vol 633-634 ◽  
pp. 341-344 ◽  
Author(s):  
Jia Yue Sun ◽  
Qiu Mei Di ◽  
Liu Han ◽  
Qi Guang Xu ◽  
Chen Liang Ma
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Optical Properties ◽  
Hydrothermal Synthesis ◽  
Emission Spectroscopy ◽  
Electron Trapping ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Electron trapping materials SrSO4:Eu2+were prepared by hydrothermal method from fatty alcohol polyoxyethylene (3) ether (AEO-3) aqueous solution at 200 °C for 20 h. The phase structure, microstructure and optical properties were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and excitation-emission spectroscopy (PL-PLE), respectively.

Characterization of Electrophoretically Deposited Chitosan Coatings on Ti13Zr13Nb Alloy for Biomedical Applications

2013 ◽  
Vol 203-204 ◽  
pp. 212-215 ◽  
Author(s):  
Bożena Łosiewicz ◽  
Grzegorz Dercz ◽  
Magdalena Szklarska ◽  
Wojciech Simka ◽  
Marta Łężniak ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Biomedical Applications ◽  
X Ray Diffraction ◽  
Bioactive Coatings ◽  
X Ray ◽  
Scanning Electron ◽  
Deposition Conditions

The chitosan (CH) coatings on a Ti13Zr13Nb alloy substrate were obtained by electrophoretic deposition (EPD). The EPD yield was investigated under different deposition conditions. The microstructure of the CH coatings obtained by cataphoresis was studied by scanning electron microscopy and the chemical composition was examined using EDAX. The functional groups and formed phases were analyzed using Fourier transform infrared spectroscopy and X-ray diffraction, respectively. It was found that the CH coating thickness and porosity can be controlled by time and voltage used for the EPD process. It was ascertained that the studied EPD of the natural biopolymer, chitosan, in aqueous solution is applicable for the surface modification of the Ti13Zr13Nb implants to develop novel bioactive coatings.

Green and facile synthesis of Fe3O4 nanoparticles using the Citrus aurantifolia fruit juice associated with NaBH4 and its adsorption of Cr(VI) in aqueous solution

2021 ◽  
Vol 10 (4) ◽  
pp. 86-96
Author(s):  
Thanh Luong Huynh Vu ◽  
Hao Dao Lam Gia ◽  
Trang Phan Thi Diem ◽  
Tien Pham Minh ◽  
Quyen Tran Thi Bich ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Fe3o4 Nanoparticles ◽  
Effective Parameters ◽  
X Ray Diffraction ◽  
Citrus Aurantifolia ◽  
X Ray ◽  
Mean Size ◽  
Scanning Electron

This work presents a facile and green method using Citrus aurantifolia fruit extract for the biosynthesis of magnetite nanoparticles (MNs). The effects of some effective parameters such as temperature, reaction time and the ratio of Citrus aurantifolia extract to sodium borohydride on the synthesis were investigated. The synthesized Fe3O4 nanoparticles were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), energy-dispersive X- ray spectroscopy (EDX), transmission scanning electron microscopy (TEM), and vibrating sample magnetometer (VSM). The results showed that the MNs were well-monodisperse with the mean size of 50 nm and superparamagnetism value of 40.1 emu/g. Adsorption of Cr(VI) in aqueous solution at pH 2.5 using MNs reached 94.9% for removal of Cr(VI). The main contribution of this work was the synthesis of MNs in an economical and environmental friendly way, achieving size-controlled MNs at mild conditions. A possible mechanism of MNs synthesis was also presented.

Study on Synthesis Nanomicrostructures of Zinc Borate (Zn3B6O12•3.5H2O) with Different Morphologies

2011 ◽  
Vol 236-238 ◽  
pp. 1687-1691 ◽  
Author(s):  
Hui Ren ◽  
You Ming Cao ◽  
Zhou Qiao Lei
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Raw Materials ◽  
Average Length ◽  
Zinc Borate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The crystal zinc borate (Zn3B6O12·3.5H2O) nano-strips and nano-flakes were successfully prepared by a wet method using boric acid (H3BO3) and Zn(NO3)2·H2O as raw materials in situ aqueous solution, and triethanolamine as the modifying agent. The nano/microstructures and morphologies of the as-obtained samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometer (EDS) and thermogravimetric analysis (TGA). It had been found that the as-prepared materials displayed nanostrips with average length from 100 to 200nm and the thicknesses about 30nm as well as nanoflakes with diameter about 4μm and thickness about several nanometers morphology.

Alumina (Al2O3) Nanofibers from Electrospinning

2012 ◽  
Vol 476-478 ◽  
pp. 379-382 ◽  
Author(s):  
Delin Lai ◽  
Yong Chen ◽  
Da Xiang Yang ◽  
Wei Ling Guo ◽  
Yu Xi Yu
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Differential Thermal Analysis ◽  
Aluminum Isopropoxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Scanning Electron

The alumina (Al2O3) nanofibers were fabricated by electrospinning a viscous mixture of aluminum isopropoxide solution in 10% aqueous solution of PVA followed by calcination at 500~1000 °C. Tools such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric and differential thermal analysis (TG-DTA) were employed to characterize the obtained nanofibers. When the nanofibers were heat treated at 1000 °C, the as-prepared nanofibers have a diameter in the range of 30 ~ 100 nm, and are composed of α-Al2O3.

Mechanisms of Phosphate Removal by Synthesized Calcite

2013 ◽  
Vol 743-744 ◽  
pp. 597-602 ◽  
Author(s):  
Nan Xu ◽  
Hong Wei Yin ◽  
Zhi Gang Chen ◽  
Ming Chen ◽  
Shou Qing Liu
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Total Concentration ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Range ◽  
Scanning Electron

Calcite was synthesized through different drying processes, and characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). By bath experiments, the mechanisms of phosphate removal by synthesizing calcite were investigated. It showed that synthesis calcite had a strong capability to remove phosphate from solution. The adsorption of phosphate mainly depended on the total concentration of phosphate and pH in solution. Magnesium tended to the phosphate adsorption during pH range of 8-13.5; while it inhibited the adsorption at around pH 7. The experimental results suggested that the synthesized calcite with aged process could effectively remove the phosphate from an alkaline aqueous solution.

Fabrication of dimension controlled BiFeO3 microcrystal

2019 ◽  
Vol 33 (10) ◽  
pp. 1950125
Author(s):  
Ya-Yun Li ◽  
Shao-Ke Shang ◽  
Yu Xia ◽  
Yun-Hui Si ◽  
Xin-Bo Xiong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Bismuth Ferrite ◽  
Hydrothermal Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pure Phase ◽  
New Perspective ◽  
Scanning Electron

In this research, the effect of different KOH concentrations on the bismuth ferrite (BiFeO3) phase formation and microcrystal size was discussed. Pure phase BiFeO3 microcrystals were successfully synthesized through controlling different KOH concentrations during the hydrothermal process. The diverse sizes of pristine BiFeO3 microcrystals were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Their photocatalytic activity was studied by photocatalytic degradation of methylene blue (MB) in aqueous solution under visible light irradiation. The results reveal that the composition and particle size of BiFeO3 microcrystals phase can be controlled with different mineralizer conditions. This work is able to provide a new perspective on the fabrication research of different dimension BiFeO3 microcrystals.

Two-Step Green Hydrothermal Synthesis of ZnO Powders

2011 ◽  
Vol 284-286 ◽  
pp. 654-657 ◽  
Author(s):  
Ling Liu ◽  
Tian Xi Wang ◽  
Yong Cai Zhang ◽  
Ming Zhang
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Field Emission ◽  
Hydrothermal Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Powders ◽  
Scanning Electron

ZnO2nanoparticles were synthesized via hydrothermal reaction between Zn5(CO3)2(OH)6powder and 30 mass% H2O2aqueous solution at 80 °C for 24 h, and ZnO powders with granular and rodlike morphologies were synthesized via hydrothermal decomposition of the as-synthesized ZnO2nanoparticles in water at 150-170 °C for 24 h. The obtained products were characterized by X-ray diffraction, Raman and Field emission scanning electron microscopy.

Synthesis of Nanotubular Titanate from Titanium Using Hydrothermal Treatment

2006 ◽  
Vol 317-318 ◽  
pp. 247-250 ◽  
Author(s):  
T. Kubo ◽  
W. Kato ◽  
Yuki Yamasaki ◽  
Atsushi Nakahira
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Hydrothermal Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Transmission Electron ◽  
Scanning Electron

In this study, the synthesis of nanotubular titanate was attempted though heat-treatment in an oil bath (non-hydrothermal treatment), heat-treatment with stirring in an oil bath (non-hydrothermal treatment), or hydrothermal treatment for metal Ti in NaOH aqueous solution systems. Obtained products were characterized by various methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). XRD results suggested that products obtained by both hydrothermal treatment and heat-treatment in an oil bath with and without stirring could be identified as H2Ti4O9H2O. From TEM observations, however, various morphologies for products obtained by these treatments were confirmed. Therefore, it was considered that morphologies of these products strongly depended on synthesis conditions.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

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