scholarly journals Preparation and Characterization of Matrix Hybrid Membranes Polyvinylidene Fluoride/Polyvinylpyrrolidone/Silica Gel/Zinc Oxide for Cr(VI) Removal from Water

2020 ◽  
Vol 44 (5) ◽  
pp. 311-318
Author(s):  
Mustapha Chabane ◽  
Chikh Melkaoui ◽  
Benamar Dahmani ◽  
Sihem Zahia Belalia
Keyword(s):  
Zinc Oxide ◽  
Silica Gel ◽  
Water Permeability ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Weight Ratio ◽  
Rejection Rate ◽  
Precipitation Method ◽  
Hybrid Membranes

Matrix hybrid membranes, based on polyvinylidene fluoride (PVDF), poly (N-vinylpyrrolidone) (PVP), silica gel (SG) and zinc oxide (ZnO) were synthesized by phase inversion via immersion precipitation method. The characterization of membrane samples was performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), optical microscopy, contact angle, porosity, mean pore size and water permeability measurements. The FTIR analysis showed the appearance of new bands attributed to the functional groups of SG and ZnO. The XRD analysis confirmed a modification in the structure of membranes. The prepared membranes were used for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. Membrane filtration experiments show that the water permeability and Cr(VI) rejection ratios increase with increasing the weight ratio ZnO (%)/SG (%). The maximum values of the Cr(VI) rejection rate and water permeability were respectively 85% and 685 L/m2hbar for weight ratios (0.75% of ZnO/0.25% of SG).

scholarly journals Improving Water Permeability of Hydrophilic PVDF Membrane Prepared via Blending with Organic and Inorganic Additives for Humic Acid Separation

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4099 ◽  
Author(s):  
Nasrul Arahman ◽  
Sri Mulyati ◽  
Afrillia Fahrina ◽  
Syawaliah Muchtar ◽  
Mukramah Yusuf ◽  
...  
Keyword(s):  
Humic Acid ◽  
Water Permeability ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Cross Flow ◽  
Chemical Compositions ◽  
Separation Performance ◽  
Pvdf Membrane ◽  
Cross Flow Filtration

The removal of impurities from water or wastewater by the membrane filtration process has become more reliable due to good hydraulic performance and high permeate quality. The filterability of the membrane can be improved by having a material with a specific pore structure and good hydrophilic properties. This work aims at preparing a polyvinylidene fluoride (PVDF) membrane incorporated with phospholipid in the form of a 2-methacryloyloxyethyl phosphorylcholine, polymeric additive in the form of polyvinylpyrrolidone, and its combination with inorganic nanosilica from a renewable source derived from bagasse. The resulting membrane morphologies were analyzed by using scanning electron microscopy. Furthermore, atomic force microscopy was performed to analyze the membrane surface roughness. The chemical compositions of the resulting membranes were identified using Fourier transform infrared. A lab-scale cross-flow filtration system module was used to evaluate the membrane’s hydraulic and separation performance by the filtration of humic acid (HA) solution as the model contaminant. Results showed that the additives improved the membrane surface hydrophilicity. All modified membranes also showed up to five times higher water permeability than the pristine PVDF, thanks to the improved structure. Additionally, all membrane samples showed HA rejections of 75–90%.

Preparation and Characterization of Gallium-Doped Zinc Oxide Nanopowders with High Electrical Conductivity

2007 ◽  
Vol 336-338 ◽  
pp. 2041-2043 ◽  
Author(s):  
Shang Feng Du ◽  
J. Liu ◽  
Yun Fa Chen
Keyword(s):  
Electrical Conductivity ◽  
Zinc Oxide ◽  
Volume Resistivity ◽  
Precipitation Method ◽  
High Electrical Conductivity ◽  
Electrically Conductive ◽  
Oxide Particles ◽  
Zinc Oxide Particles ◽  
Co Precipitation

Gallium-doped zinc oxide nanopowders with high electrical conductivity were prepared by calcining the precursor synthesized from ZnSO4·7H2O, GaCl3 and NH4HCO3 by co-precipitation method. The obtained samples were characterized by FE-SEM, TEM, XRD, XPS and BET techniques. The precursor particles were in the shape of sheet-like with size about several hundred nanometers. The electrically conductive zinc oxide particles, in the shape of sphere-like, were about 10~40 nm with low agglomeration, and the specific surface area was 28.7 m2/g. XRD and XPS results showed that all the doped Ga exists as the substitution form of Ga• Zn in the ZnO system. The volume resistivity of the product was as lower as 4.5 :·cm.

scholarly journals Using Co-Precipitation Method Determining Synthesis and Characterization of Fe Doped Zinc Oxide Nanoparticles

2019 ◽  
Vol 8 (9S3) ◽  
pp. 705-707
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Chemical Precipitation ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
Ferric Nitrate ◽  
Doped Zno ◽  
Co Precipitation

In through concoction co-precipitation strategy using ferric nitrate, zinc nitrate and sodium hydroxide in fluid arrangements, orchestrate and portrayal of Fe doped ZnO nanoparticles were prepared in the present work. X-beam diffraction has confirmed the growth of Fe doped ZnO from the precursor. This result has revealed that nanoparticles have integrated excellent crystalline forces in nature. SEM investigations show that ZnO nanoparticles have been doped by the round and minimally agglomerated Fe. Room temperature powerless ferromagnetism, distinctive in the appealing characteristics of Fe doped ZnO powderKeywords in relation to room temperature: zinc oxide, SEM, chemical precipitation, XRD, VSM

SYNTHESIS AND CHARACTERIZATION OF α-Fe2O3@ATO NANOCOMPOSITE PARTICLES

2008 ◽  
Vol 15 (05) ◽  
pp. 545-550 ◽  
Author(s):  
YIN-CUN ZHU ◽  
JI-SEN JIANG
Keyword(s):  
Weight Ratio ◽  
Precipitation Method ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Nanocomposite Particles ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Treatment Conditions ◽  
Transmission Electron

α- Fe 2 O 3@ATO (antimony doped tin oxide) nanocomposite particles with core–shell structure were prepared by homogeneous precipitation method using monodispersed α- Fe 2 O 3 (hematite) nanoparticles as cores, SnCl 4 · 5 H 2 O and SbCl 3 as the precursor of the shell. The morphology and structure of the nanocomposite particles were studied with transmission electron microscopy and X-ray diffraction, respectively. The electricity properties of the nanocomposite were also investigated in terms of coating amount, molar ratio of element Sb to Sn , and heat treatment conditions. The results showed that the conditions of ATO/α- Fe 2 O 3 (weight ratio) = 70%, n( Sb )/n( Sn ) = 10%, calcined at 700°C for 1 h were optimal for the conductivity of the nanocomposite.

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

Preparation and Characterization of Biodiesel from Karanja Oil by Using Silica Gel Reactor

2014 ◽  
Author(s):  
Sukanta Mondal ◽  
Kaniz Ferdous ◽  
M. Rakib Uddin ◽  
Maksudur R. Khan ◽  
M. A. Islam ◽  
...  
Keyword(s):  
Silica Gel ◽  
Karanja Oil

Exploring the characterization of Ni doped MgO nanoparticles using co-precipitation method

2020 ◽  
Vol 3 (1) ◽  
pp. 30-33
Author(s):  
Muthulakshmi M ◽  
Madhumitha G
Keyword(s):  
Magnesium Oxide ◽  
Analytical Techniques ◽  
Nickel Chloride ◽  
Precipitation Method ◽  
Crystalline Powder ◽  
High Melting Point ◽  
Design Synthesis ◽  
Mgo Nanoparticles ◽  
Co Precipitation

Nanotechnology is a field of applied science focused on design, synthesis and characterization of nanomaterials. The nickel and magnesium have improved their applications in transparent electrodes and nano electronics. In addition, magnesium oxide has moisture resistance and high melting point properties. In the present work has been carried out in the development of green crystalline powder of nickel doped magnesium oxide nanoparticles by Co-precipitation method, from the mixture of nickel chloride and magnesium chloride with KOH as solvent. From the XRD results, crystalline size of the particle can be observed. Spherical structure of Ni doped MgO nanoparticles were indicated by SEM results and powdered composition of samples were obtained from FTIR. EDAX represents the peak composition of the nanoparticle. The above analytical techniques have confirmed that the Ni doped MgO nanoparticles obtained from the mixture of NiCl2 and MgCl2.

Preparation and Characterization of Polyvinylidene Fluoride/ZrO2-TiO2 Optical Film with Wide Band Gap and High Refractive Index

2013 ◽  
Vol 28 (6) ◽  
pp. 671-676 ◽  
Author(s):  
Yu-Qing ZHANG ◽  
Li-Li ZHAO ◽  
Shi-Long XU ◽  
Chao ZHANG ◽  
Xiao-Ying CHEN ◽  
...  
Keyword(s):  
Refractive Index ◽  
Band Gap ◽  
Polyvinylidene Fluoride ◽  
Wide Band ◽  
High Refractive Index ◽  
Wide Band Gap ◽  
Optical Film
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