Micro-Porous Alumina Membrane Prepared by Dip Coating Using Latex Binder

2011 ◽  
Vol 695 ◽  
pp. 549-552
Author(s):  
Khanthima Hemra ◽  
Pavadee Aungkavattana ◽  
Duangduen Atong
Keyword(s):  
Ceramic Membrane ◽  
Average Pore Size ◽  
Porous Alumina ◽  
Dip Coating ◽  
Solid Loading ◽  
Alumina Powder ◽  
Alumina Membrane ◽  
Average Pore ◽  
Membrane Layer ◽  
Dipping Time

Ceramic membrane has been extensively studied for a half of century. The research of alumina membranes was improved a great deal, however, they have always been considered as an opportunity in commercial product. In this research, submicron alumina powders, AKP-30 were deposited on the porous alumina tube support containing approximately 40% porosity by dip coating. The effects of solid loading, dispersant, and binder system on colloidal process were evaluated. It was found that the thickness of membrane layer depend on the type of binders (latex binder, polyvinyl alcohol binder, and poly (ethylene oxide) polymer binder) and dipping time when the withdrawal speed was constant. The proper suspension of 30 wt.% AKP-30 alumina powder with 18.8 wt.% latex binder provided proper sintered membrane without cracking or delaminating. The porosity and average pore size of coating layer was about 29% and 0.06 μm, respectively at a sintering temperature of 1400°C for 2 hr. The membrane layer was likely to thicken with increasing dipping time. The thickness of membrane after sintering was about 30-40 μm at a few second of dipping time.

A New Inorganic Membrane: TiO2 Ultrafilter Based on Functionally Graded Porous Alumina

2007 ◽  
Vol 553 ◽  
pp. 239-244 ◽  
Author(s):  
Cavus Falamaki ◽  
Jamileh Veysizadeh
Keyword(s):  
Pore Size ◽  
Impurity Concentration ◽  
Average Pore Size ◽  
Porous Alumina ◽  
Functionally Graded ◽  
Inorganic Membrane ◽  
Average Particle ◽  
Average Pore ◽  
Membrane Layer ◽  
First Time

The fabrication of thin nanoporous TiO2 layers (thickness < 2 μm) on functionally graded porous alumina (thickness = 2 mm) is reported for the first time. The membrane is produced by dip coating TiO2 sols on the alumina support. The alumina porous support is produced using centrifugal casting with an acceleration of 3000g .The average pore size of the support is ca. 0.5 μm while its upper surface on which the membrane layer is deposited has an average pore diameter of 0.38 μm and average porosity of 10.7 %. The sol is produced by the peptization technique using tetrapropylorthotitanate as precursor. For the first time, a synthesis procedure has been implemented which allows the production of TiO2 sols with average particle sizes from12 to 22 nm. Using the BET technique, the average pore size and meso-porosity of the unsupported sintered TiO2 membranes as a function of sintering temperature and ZrO2 impurity concentration (0.0, 0.2, 0.6 and 1.0 wt. % of ZrO2) have been determined. The kinetics of the membrane layer anatase to rutile transformation reaction has been investigated as a function of ZrO2 impurity concentration introduced to the TiO2 sol during its preparation. The lack of macrocraks in the ultrafilter layer of the sintered composite was confirmed using the gas permeability and SEM techniques. The main outcome of this work is that the support has an outstanding low surface roughness (< 0.4 μm) allowing deposition of a defect free single layer of TiO2 in one step

Sol–Gel Synthesis of Alumina–Titania Nanostructure Membrane: Preparation and Characterization

2011 ◽  
Vol 2 (3) ◽  
Author(s):  
S. Akbarnezhad ◽  
S. M. Mousavi ◽  
M. Pakizeh ◽  
S. Kiani
Keyword(s):  
Electron Microscopy ◽  
Average Pore Size ◽  
Porous Alumina ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Alumina Membrane ◽  
Average Pore ◽  
Transmission Electron Microscopy Analysis ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis

In the present paper, the preparation and characterization of porous alumina–titania nanostructure membrane is described. The membrane layers consisted of an α-alumina membrane support, which was dip-coated with a composite alumina–titania top layer prepared in a sol–gel process. Thermogravimetric analysis showed that drying progress of the membrane layer is completed at about 560 °C. Scanning electron microscopy analysis displayed a smooth and defect-free layer of alumina–titania membrane after calcination at 600 °C. X-ray diffraction analysis showed the formation of gamma and orthorhombic alumina, brookite titania, and aluminium titanate (Al2TiO5) after the calcination step. Transmission electron microscopy analysis showed that the alumina–titania composite particle size was almost below 40 nm. The Brunauer–Emmet–Teller (BET) surface area, average pore size, and thickness of the membrane top layer were determined to be 292 m2/g, 2.2 nm, and 4 μm, respectively.

scholarly journals Nanoporous Alumina Membranes for Sugar Industry: An Investigation of Sintering Parameters Influence onUltrafiltration Performance

2021 ◽  
Vol 13 (14) ◽  
pp. 7593
Author(s):  
Farooq Khan Niazi ◽  
Malik Adeel Umer ◽  
Ashfaq Ahmed ◽  
Muhammad Arslan Hafeez ◽  
Zafar Khan ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Pore Size ◽  
Sugar Industry ◽  
Average Pore Size ◽  
Research Work ◽  
Homogeneous Distribution ◽  
Alumina Membrane ◽  
Average Pore ◽  
Nanoporous Alumina ◽  
Alumina Membranes

Ultrafiltration membranes offer a progressive and efficient means to filter out various process fluids. The prime factor influencing ultrafiltration to a great extent is the porosity of the membranes employed. Regarding membrane development, alumina membranes are extensively studied due to their uniform porosity and mechanical strength. The present research work is specifically aimed towards the investigation of nanoporous alumina membranes, as a function of sintering parameters, on ultrafiltration performance. Alumina membranes are fabricated by sintering at various temperatures ranging from 1200–1300 °C for different holding times between 5–15 h. The morphological analysis, conducted using Scanning electron microscopy (SEM), revealed a homogeneous distribution of pores throughout the surface and cross-section of the membranes developed. It was observed that an increase in the sintering temperature and time resulted in a gradual decrease in the average pore size. A sample with an optimal pore size of 73.65 nm achieved after sintering at 1250 °C for 15 h, was used for the evaluation of ultrafiltration performance. However, the best mechanical strength and highest stress-bearing ability were exhibited by the sample sintered at 1300 °C for 5 h, whereas the sample sintered at 1250 °C for 5 h displayed the highest strain in terms of compression. The selected alumina membrane sample demonstrated excellent performance in the ultrafiltration of sugarcane juice, compared to the other process liquids.

scholarly journals Analysis of Superhydrophobic-Superoleophilic Properties on Modification of Polyurethane Sponge for Selective Oil-Water Separation

2021 ◽  
Vol 4 (1) ◽  
pp. 52-62
Author(s):  
Niken Aprilia Eka Putri ◽  
Arif Tjahjono ◽  
Perdamean Sebayang
Keyword(s):  
Separation Efficiency ◽  
Average Pore Size ◽  
Dip Coating ◽  
Absorption Capacity ◽  
Average Pore ◽  
Water Contact ◽  
Water Separation ◽  
Coating Methods ◽  
Oil Water Separation ◽  
Polyurethane Sponge

In this research, a modification of polyurethane (PU) sponge material has been made to obtain superhydrophobic-superoleophilic properties. The PU sponge was coated with several nanomaterials such as ZnO, Fe3O4+TEOS, and stearic acid by dip-coating and drop-coating methods. The tests include selective separation of oil and water with a magnetic response. Several types of oil and organic solvents were tested for absorption capacity. The results showed that the PU@ZnO@Fe3O4@SA sponge has a good absorption capacity, from 4.37 mL to 7.37 mL. The fabricated PU sponge could selectively separate oil from water with a separation efficiency above 99%. The fabricated PU sponge also could be magnetically driven by external magnetic fields. From the characterization using 3D OM, the water contact angle was 153.38°, which indicates that the PU@ZnO@Fe3O4@SA sponge is superhydrophobic. And from surface morphology obtained an average pore size diameter of 167.475 μm.

scholarly journals EFFECT OF AGAR-KAOLIN INTERACTION IN GELCASTING MIXTURES ON FORMING OF ALUMINA MEMBRANE SUPPORT

2018 ◽  
Vol 80 (3-2) ◽  
Author(s):  
Kowit Lertwittayanon
Keyword(s):  
Optimum Condition ◽  
Relative Density ◽  
Pore Size ◽  
Rough Surface ◽  
Sintering Temperature ◽  
Average Pore Size ◽  
High Strength ◽  
Asymmetric Membrane ◽  
Alumina Membrane ◽  
Average Pore

Disc alumina membrane supports were formed through agar gelcasting method. The agar gelcasting was expected to be environmentally-friendly forming technique using simple equipment. Final agar amounts (0.25 – 0.75wt%) in gelcasting mixtures were varied to find the optimum condition of shaping and the desired microstructure of sintered supports. The gelcasting mixtures were prepared from non-reactive grade Al2O3 and porcelain at the ratio of 98.5:1.5 by weight. The porcelain addition allowed the membrane support to have high strength at lower sintering temperature. When the final agar amounts increased from 0.25 to 0.75wt%, the dried, gelcast supports tended to have rough surface and subsequently resulting in crack. TGA profiles confirmed that there was interaction between agar chains and kaolin particles on cooling the gelcast supports leading to different microstructures after sintering. The final agar amount of 0.5 wt% provided the highest porosity of 48.9% and the highest relative density of 61.5%. Additionally, the average pore size of 1.5 µm was obtained at the final agar amount of 0.5 wt% suitable for using as asymmetric membrane support or microfiltration membrane.   

scholarly journals Preparation and characterization of ZnO microfiltration membrane and its support using kaolin (DD3) and CaCO3

Cerâmica ◽  
2016 ◽  
Vol 62 (362) ◽  
pp. 186-190 ◽  
Author(s):  
B. Boudaira ◽  
A. Harabi ◽  
F. Bouzerara ◽  
S. Condom ◽  
F. Zenikheri ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Calcium Carbonate ◽  
Pore Size ◽  
Average Pore Size ◽  
Slip Casting ◽  
Average Pore ◽  
Membrane Layer ◽  
Casting Technique ◽  
Ceramic Support

Abstract The objective of the present paper was to prepare a ceramic support with membrane. Tubular ceramic supports prepared from kaolin (DD3) and calcium carbonate with 6 and 10 mm inner and outer diameters, respectively, were extruded and sintered at 1200 °C. It has been found that sintered supports had interesting characteristics: average pore size of about 5µm, porosity of about 50%, and monomodal pore size distribution. This support was used to be substrate for a membrane layer of microfiltration. This membrane layer was elaborated from zinc oxide, using slip casting technique. The specimens were subsequently sintered at 1000 °C. The microstructure and porosity as well as the permeability have also been studied. It has been found that the average pore size was about 1.2µm, the layer thickness was ~33µm, and the water permeability measured was about 880 L.h-1.m-2.bar-1.

A Modified Chemical Route for Synthesis of Zirconia Thin Films Having Tunable Porosity

2008 ◽  
Vol 1074 ◽  
Author(s):  
Manish Kumar ◽  
G. B. Reddy
Keyword(s):  
Thin Films ◽  
Average Pore Size ◽  
Sol Gel ◽  
Dip Coating ◽  
Porous Films ◽  
Average Pore ◽  
Chemical Route ◽  
Porous Microstructure ◽  
Chemical Synthesis Route ◽  
Deposited Films

ABSTRACTA new chemical synthesis route is reported for deposition of zirconia thin films having adjustable porosity with average pore size in nanometer range. Deposition method is simply a sol-gel dip coating in which HCl is used as catalyst. TEM and FTIR studies of deposited films show porous microstructure, which depends critically on ageing of sol used. The shift in binding energy of Zr 3d5/2 (at 182.4 eV) attributes the formation of zirconia. Optical results show high transmittance (> 80%) in VIS-NIR region and effective refractive indices values (neff) tend to decrease for films prepared with higher aged sol. Porosity enhancement from 15-52% is observed by neff comparing with refractive index of non porous films (nz).

scholarly journals Fabrication, Optimization, and Performance of a TiO2 Coated Bentonite Membrane for Produced Water Treatment: Effect of Grafting Time

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 739
Author(s):  
Mohamad Izrin Mohamad Esham ◽  
Abdul Latif Ahmad ◽  
Mohd Hafiz Dzarfan Othman
Keyword(s):  
Produced Water ◽  
Ceramic Membrane ◽  
Average Pore Size ◽  
Pure Water ◽  
Sol Gel ◽  
Water Flux ◽  
Ceramic Membranes ◽  
Average Pore ◽  
Pure Water Flux ◽  
And Performance

The main problem usually faced by commercial ceramic membranes in the treatment of produced water (PW) is low water flux even though ceramic membrane was well-known with their excellent mechanical, thermal, and chemical properties. In the process of minimizing the problem faced by commercial ceramic membranes, titanium dioxide (TiO2) nanocomposites, which synthesized via a sol-gel method, were deposited on the active layer of the hydrolysed bentonite membrane. This paper studied the influence of grafting time of TiO2 nanocomposite on the properties and performance of the coated bentonite membranes. Several characterizations, which are Fourier transform infrared (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray Spectroscopy (EDX), contact angle, porosity, and average pore size, were applied to both pristine and coated bentonite membranes to compare the properties of the membranes. The deposition of TiO2 nanoparticles on the surface of the coated bentonite membranes was successfully confirmed by the characterization results. The pure water flux performance showed an increment from 262.29 L h−1 m−² bar−1 (pristine bentonite membrane) to 337.05 L h−1 m−² bar−1 (Ti-Ben 30) and 438.33 L h−1 m−² bar−1 (Ti-Ben 60) as the grafting time increase but when the grafting time reached 90 min (Ti-Ben 90), the pure water flux was decreased to 214.22 L h−1 m−² bar−1 which is lower than the pristine membrane. The oil rejection performance also revealed an increase in the oil rejection performance from 95 to 99%. These findings can be a good example to further studies and exploit the advantages of modified ceramic membranes in PW treatment.

scholarly journals Study of Ceramic Membrane from Naturally Occurring-Kaolin Clays for Microfiltration Applications

2017 ◽  
Vol 61 (3) ◽  
pp. 206 ◽  
Author(s):  
Sonia Bouzid Rekik ◽  
Jamel Bouaziz ◽  
Andre Deratani ◽  
Semia Beklouti
Keyword(s):  
Pore Size ◽  
Corn Starch ◽  
Ceramic Membrane ◽  
Average Pore Size ◽  
Membrane Surface ◽  
Oxygen Demand ◽  
Ceramic Membranes ◽  
Average Pore ◽  
Naturally Occurring ◽  
Kaolin Clays

The focus of this work is to assess the quality of porous membranes prepared from naturally occurring kaolin clays and to evaluate the performance of tubular ceramic membranes treating integrated raw effluents from seafood industry. This material has been chosen due to its natural abundance, its non-toxicity, low cost and its valuable properties. The preparation and characterization of porous tubular ceramic membranes, using kaolin powder with and without corn starch as poreforming agent, were reported. SEM photographs indicated that the membrane surface was homogeneous. The effects of material compositions, additives and the relatively lower sintering temperature, ranging from 1100° to 1250°C, on porosity, average pore size, pore-size distribution and mechanical strength of membranes have been investigated. A correlation between microstructure and mechanical properties of membranes has been discussed. The performance of the novel ceramic membranes thus obtained was determined by evaluating both the water permeability and rejection. The obtained membrane was used to treat cuttlefish effluents generated from the conditioning seawater product industry which consumes a great amount of water. Cross-flow microfiltration was performed then, in order to reduce the turbidity and chemical oxygen demand (COD). 

scholarly journals Preparation and Characterization of Sugar Based Catalyst on Various Supports

2017 ◽  
Vol 12 (1) ◽  
pp. 41
Author(s):  
Jidon Adrian Janaun ◽  
Tan Jaik Mey ◽  
Awang Bono ◽  
Duduku Krishnaiah
Keyword(s):  
Pore Size ◽  
Active Sites ◽  
Average Pore Size ◽  
Acid Catalyst ◽  
Hydrothermal Carbonization ◽  
Acid Group ◽  
Dip Coating ◽  
Ceramic Surface ◽  
Average Pore

<p>A novel structured carbon-based acid catalyst was prepared by depositing the carbon precursor onto glass, ceramic and aluminum supports via dip-coating method, followed by carbonization process for converting the d-glucose layer into black carbon char in an inert nitrogen environment at 400 °C. Then, the –SO<sub>3</sub>H group was introduced into the framework of the carbon char by multiple vapor phase sulfonation. Four different carbonization methods were carried out (dry pyrolysis and hydrothermal carbonization with or without pressurized) in the catalyst preparation while among the carbonization methods, the samples which prepared from dry pyrolysis without pressurized process showed the strong acidity due to highest adsorption of acid group in the catalyst surface although the catalyst attached onto the support was the least compared to other preparation methods. Among the catalysts, the sulfonated carbon-base catalyst that is attached on the ceramic support exhibited the highest aci-dity (1.327 mmol/g) followed by the catalyst deposited on the glass (0.917 mmol/g) and aluminum (0.321 mmol/g) supports. The porous structure of ceramic surface, allowed a better interaction between reactants and –SO<sub>3</sub>H site in the carbon. Through the FT-IR analysis, it was observed that the functional groups –COOH, –OH, and –SO<sub>3</sub>H were present in the active sites of the catalysts. The surface areas of  glass (Si–SC), ceramic (Ce–SC) and aluminum (Al–SC) catalysts were larger than 1 m<sup>2</sup>/g, whereas the pore size belongs to macroporous as the average pore size is more than 50 nm. It is also stable within the temperature of 400 °C as there was less than 10% weight loss revealed from the TGA analysis. Copyright © 2017 BCREC GROUP. All rights reserved</p><p><em>Received: 20<sup>th</sup> April 2016; Revised: 14<sup>th</sup> October 2016; Accepted: 17<sup>th</sup> October 2016</em></p><p><strong>How to Cite:</strong> Janaun, J.A., Mey, T.J., Bono, A., Krishnaiah, D. (2017). Preparation and Characterization of Sugar Based Catalyst on Various Supports.<em> Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 12 (1): 41-48 (doi:10.9767/bcrec.12.1.478.41-48)</p><p><strong>Permalink/DOI:</strong> http://dx.doi.org/10.9767/bcrec.12.1.478.41-48</p><p> </p>

Sign in / Sign up

Export Citation Format

Share Document