Natural polyphenol chemistry inspired organic-inorganic composite coating decorated PVDF membrane for oil-in-water emulsions separation

2020 ◽  
Vol 132 ◽  
pp. 110995
Author(s):  
Fei Tang ◽  
Deyong Wang ◽  
Cailong Zhou ◽  
Xinjuan Zeng ◽  
Jingcheng Du ◽  
...  
Keyword(s):  
Composite Coating ◽  
Pvdf Membrane ◽  
Oil In Water ◽  
Natural Polyphenol ◽  
Inorganic Composite

Preparation and Properties of the Organic-Inorganic Composite Coating on Aluminum Alloy

2011 ◽  
Vol 675-677 ◽  
pp. 1197-1200
Author(s):  
Guo Jun Li ◽  
Xue Jun Cui ◽  
Rui Ming Ren
Keyword(s):  
Aluminum Alloy ◽  
Composite Coating ◽  
Lamellar Structure ◽  
Impact Resistance ◽  
Weight Ratio ◽  
Silica Sol ◽  
Nano Tio2 ◽  
Optimum Range ◽  
Acid Catalyzed ◽  
Inorganic Composite

The organic-inorganic hybrid sol was prepared using an alkaline silica sol modified by acid-catalyzed hydrolytic polycondensation of methyltrimethoxysilane (MTMS) in a water-bath condition of 60oC, and then the water-based primer and topcoat were prepared through adding the pigments and nano-TiO2 suspension respectively. Through spraying and baking, the organicinorganic composite coating on the treated aluminum alloy was obtained. The optimum range of P/B (weight ratio of the pigment/binder) is determined between 1:1 and 1.5:1 by investigating the influence of the P/B of the primer on the adhesion and impact resistance of the coating. The microstructure of the coating was characterized by optical microscopy and scanning electron microscopy. The results show that there are lots of holes and lamellar structure in the primer coating and the obtained topcoat coating is uniform, smooth and dense. The coating of ~30 μm in thickness is mainly composed of three elements of silicon, aluminum and titanium, in which transition layer of ~10 μm is included. The physicochemical properties suggest that the coatings on aluminum alloy can meet the needs of finishing coating very well.

Separation of oil/water emulsion using nano-particle (TiO2/Al2O3) modified PVDF ultrafiltration membranes and evaluation of fouling mechanism

2013 ◽  
Vol 67 (3) ◽  
pp. 477-484 ◽  
Author(s):  
X. S. Yi ◽  
S. L. Yu ◽  
W. X. Shi ◽  
S. Wang ◽  
L. M. Jin ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Transmembrane Pressure ◽  
Cake Filtration ◽  
Cross Sectional ◽  
Water Emulsion ◽  
Pvdf Membrane ◽  
Pore Blocking ◽  
Oil In Water ◽  
Emulsion Separation ◽  
Oil Water

In the present study, nano-sized TiO2/Al2O3 modified polyvinylidene fluoride (PVDF) membranes (MM) were fabricated and then utilized for oil/water emulsion separation. The results showed that, compared with PVDF membrane (OM), the contact angle of MM decreased and hydrophilicity increased. The ultrafiltration (UF) of oil in water emulsions with transmembrane pressure (TMP) increasing results in a sharp fall in relative flux with time. The cake filtration models did not always predict the performance over the complete range of filtration times very well. In the initial 30 min, all the four cake models can simulate this UF process to a certain extent, and the suitability was: cake filtration > intermediate pore blocking > standard pore blocking > complete pore blocking models. However, they were no longer adapted well with UF time extent to 60 min, but only cake filtration (R2 = 0.9535) maintained a high adaptability. Surface and cross-sectional morphology of the membrane was investigated by SEM to make an advanced certificate of this UF mechanism.

PVDF MEMBRANE FOR OIL-IN-WATER SEPARATION VIA CROSS-FLOW ULTRAFILTRATION PROCESS

2015 ◽  
Vol 78 (1) ◽  
Author(s):  
A. Moslehyani ◽  
M. Mobaraki ◽  
A. F. Ismail ◽  
M. H. D. Othman ◽  
A. Mayahi ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Cross Flow ◽  
Permeate Flux ◽  
Thermal Stabilities ◽  
Water Separation ◽  
Pvdf Membrane ◽  
Membrane Matrix ◽  
Phase Inversion Technique ◽  
Oil In Water ◽  
Wet Phase Inversion

The objective of this study is to investigate the potential of ultrafiltration polyvinylidene fluoride (PVDF)-titanium dioxide (TiO2) membrane for oil-in-water separator. PVDF polymeric matrix membrane is excellent in term of chemical and thermal stabilities, which make it very promising to be used as a membrane matrix for water separation. However, poor hydrophilic property of the PVDF has led to the severe fouling during operation. Thus, current work was performed to investigate the effect of incorporation of two additives i.e. polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) in PVDF-TiO2 membrane, which fabricated using dry/wet phase inversion technique. Membranes characterizations were performed using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), contact angle and UV-vis spectrophotometer. Accordingly, modified PVDF membrane possessed good hydrophilicity property when the additives were added into PVDF-TiO2 membrane matrix. In term of filtration performance, the experimental results showed that oil rejection using PVDF-TiO2/PVP membrane were ~99.7%, which met the requirement for discharge. On the other hand, PVDF-TiO2/PEG membrane was shown more enhancement in terms of permeate flux by given over 64 (L/m2h) at pressure of 2 bar gauge.

scholarly journals Anti-Wear Organic-Inorganic Composite Coating

Kobunshi ◽  
1999 ◽  
Vol 48 (4) ◽  
pp. 264-264
Author(s):  
Satoshi KAWASMMA
Keyword(s):  
Composite Coating ◽  
Inorganic Composite

Curing of inorganic composition coating of aluminum – phosphate system

2020 ◽  
Vol 25 (2) ◽  
pp. 26-33
Author(s):  
S.A. Demin ◽  
A.P. Petrova
Keyword(s):  
Heat Treatment ◽  
Composite Coating ◽  
Potassium Phosphate ◽  
Aluminum Phosphate ◽  
Large Structures ◽  
Recent Developments ◽  
Poorly Soluble ◽  
Prolonged Heat ◽  
Phosphate System ◽  
Inorganic Composite

Known methods for applying an inorganic composite coating are accompanied by its heat treatment at a temperature of at least 300 °C, which requires the use of furnaces. Recent developments have allowed to reduce the temperature of heat treatment to 90 °C for at least 3 hours or to 105 °C for at least 1 h, which allows the use of portable heating equipment. However, the use of any equipment with such prolonged heat treatment is not acceptable when applying corrosion protection to large structures, especially when their dismantling is impossible. The results of studies on the chemical curing of an inorganic composite coating that does not require heat treatment are presented. It is proposed to spray a hardener solution onto a composite coating having a more alkaline pH instead of heat treatment. When a hardener reacts with acidic residues of an inorganic binder on the surface of a dried coating, monosubstituted phosphates undergo a transition to poorly soluble two-and practically insoluble tri-substituted phosphates not only on the coating surface, but also on the inner surface of the pores, which leads to almost complete insolubility of the coating. Treatment of the coating with an aqueous solution of monosubstituted potassium phosphate, two-substituted potassium phosphate or potassium pyrophosphate gives the coating water resistance. The inorganic composite coating acquires a high protective ability (more than 1300 hours in a salt fog chamber) on steel parts after treatment with only aqueous solutions of mono-substituted or two-substituted potassium phosphate.

Evaluation of self-cleaning performance of the modified g-C3N4 and GO based PVDF membrane toward oil-in-water separation under visible-light

Chemosphere ◽  
2019 ◽  
Vol 230 ◽  
pp. 40-50 ◽  
Author(s):  
Yahui Shi ◽  
Jinhui Huang ◽  
Guangming Zeng ◽  
Wenjian Cheng ◽  
Jianglin Hu ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Separation ◽  
Pvdf Membrane ◽  
Cleaning Performance ◽  
Oil In Water ◽  
Self Cleaning
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