scholarly journals Application of a triblock copolymer additive modified polyvinylidene fluoride membrane for effective oil/water separation

2018 ◽  
Vol 5 (5) ◽  
pp. 171979 ◽  
Author(s):  
S. S. Shen ◽  
K. P. Liu ◽  
J. J. Yang ◽  
Y. Li ◽  
R. B. Bai ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Triblock Copolymer ◽  
Oily Wastewater ◽  
The Novel ◽  
Permeate Flux ◽  
Cleaning Efficiency ◽  
Water Separation ◽  
Water Emulsion ◽  
Oil Water Separation ◽  
Oil Water

A hollow fibre membrane was fabricated by blending polyvinylidene fluoride (PVDF) with a triblock copolymer additive polymer that has both hydrophilic and oleophobic surface properties. The novel membrane was characterized and examined for oil/water separation under various system conditions, including different cross-flow rate, feed temperature, trans-membrane pressure, and its rejection and cleaning efficiency, etc. By applying the membrane into the filtration of synthesized oil/water emulsion, the membrane constantly achieved an oil rejection rate of above 99%, with a relatively constant permeate flux varied in the range of 68.9–59.0 l m −2  h −1 . More importantly, the fouling of the used membrane can be easily removed by simple water flushing. The membrane also demonstrated a wide adaptability for different types of real oily wastewater, even at very high feed oil concentration (approx. 115 000 mg l −1 in terms of chemical oxygen demand (COM)). Hence, the novel triblock copolymer additive-modified PVDF membrane can have a great prospect in the continuing effort to expand the engineering application of polymeric membranes for oily wastewater treatment.

scholarly journals Development of Janus Cellulose Acetate Fiber (CA) Membranes for Highly Efficient Oil–Water Separation

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5916
Author(s):  
Xiaotian Yu ◽  
Xian Zhang ◽  
Yajie Xing ◽  
Hongjing Zhang ◽  
Wuwei Jiang ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Water Mixture ◽  
Permeate Flux ◽  
Fiber Membrane ◽  
Water Separation ◽  
Water Emulsion ◽  
X Ray ◽  
Centrifugal Spinning ◽  
Oil Water Separation ◽  
Oil Water

A new type of Janus cellulose acetate (CA) fiber membrane was used to separate oil–water emulsions, which was prepared with plasma gas phase grafting by polymerizing octamethylcyclotetrasiloxane (D4) onto a CA fiber membrane prepared by centrifugal spinning. The Janus–CA fiber membrane was described in terms of chemical structure using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) analysis, energy dispersive X-ray spectroscopy (EDX) analysis and morphology by field emission scanning electron microscopy (FESEM). In this contribution, we examine the influence of spinning solution concentration, spinning speed and nozzle aperture on the centrifugal spinning process and the fiber morphology. Superhydrophobic/hydrophilic Janus–CA fiber membrane was used to separate water and 1,2-dibromoethane mixture and Toluene-in-water emulsion. Unidirectional water transfer Janus–CA fiber membrane was used to separate n-hexane and water mixture. The separation for the first-time interception rate was about 98.81%, 98.76% and 98.73%, respectively. Experimental results revealed that the Janus cellulose acetate (CA) fiber membrane gave a permeate flux of about 43.32, 331.72 and 275.27 L/(m2·h), respectively. The novel Janus–CA fiber membrane can potentially be used for sustainable W/O emulsion separation. We believe that this is a facile strategy for construction of filtration materials for practical oil–water separation.

scholarly journals Development of Red Clay Ultrafiltration Membranes for Oil-Water Separation

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 248
Author(s):  
Saad A. Aljlil
Keyword(s):  
Ceramic Membrane ◽  
Applied Pressure ◽  
Operating Pressure ◽  
Permeate Flux ◽  
Carbon Membrane ◽  
Red Clay ◽  
Water Separation ◽  
Water Emulsion ◽  
Cross Flow Filtration ◽  
Oil Water

In this study, a red clay/nano-activated carbon membrane was investigated for the removal of oil from industrial wastewater. The sintering temperature was minimized using CaF2 powder as a binder. The fabricated membrane was characterized by its mechanical properties, average pore size, and hydrophilicity. A contact angle of 67.3° and membrane spore size of 95.46 nm were obtained. The prepared membrane was tested by a cross-flow filtration process using an oil-water emulsion, and showed a promising permeate flux and oil rejection results. During the separation of oil from water, the flux increased from 191.38 to 284.99 L/m2 on increasing the applied pressure from 3 to 6 bar. In addition, high water permeability was obtained for the fabricated membrane at low operating pressure. However, the membrane flux decreased from 490.28 to 367.32 L/m2·h due to oil deposition on the membrane surface; regardless, the maximum oil rejection was 99.96% at an oil concentration of 80 NTU and a pressure of 5 bar. The fabricated membrane was negatively charged, as were the oil droplets, thereby facilitating membrane purification through backwashing. The obtained ceramic membrane functioned well as a hydrophilic membrane and showed potential for use in oil wastewater treatment.

Chelation Assembly of Cellulose Nanohydrogel onto Flower-Like Structured Foam with Underwater Superoleophobicity for Highly Efficient Oil–Water Separation

NANO ◽  
2021 ◽  
pp. 2150061
Author(s):  
Yuntian Wan ◽  
Xue Lin ◽  
Zhongshuai Chang ◽  
Xiaohui Dai ◽  
Jiangdong Dai
Keyword(s):  
Water Flux ◽  
Separation Performance ◽  
Layer By Layer ◽  
Potential Candidate ◽  
Oily Wastewater ◽  
Water Separation ◽  
Composite Foam ◽  
Oil Water Separation ◽  
Oil Water ◽  
Underwater Superoleophobicity

Currently, with the increasingly serious pollution problem of oily wastewater, it is urgent to develop advanced materials and methods. In this work, a Fe(III)-CMC@Ni(OH)2@Ni composite foam with superhydrophilic and underwater superoleophobicity was fabricated by an in situ growth of flower-like Ni(OH)2 nanoparticles and chelated assembly of Fe(III)-CMC nanohydrogel via a layer-by-layer self assembly using Fe[Formula: see text] ion and carboxymethyl cellulose (CMC). The composite foam could separate various oil/water mixtures and exhibited excellent efficiency over 99%. This foam possessed ultrahigh water flux (220000[Formula: see text]L m[Formula: see text] h[Formula: see text] and better resistant to penetration pressure (1.3[Formula: see text]kPa). After 30 cycles, the oil–water separation performance reduced only 0.5%, but the foam structure was still stable that guarantees a better lifetime. Besides, this composite foam showed anti-fouling, unique durability and excellent corrosion resistance performance. Taking into account all good properties, Fe(III)-CMC@Ni(OH)2@Ni composite foam was expected to be a potential candidate for responding to all kinds of complex oily wastewater conditions.

A facile surface modification of a PVDF membrane via CaCO3 mineralization for efficient oil/water emulsion separation

2020 ◽  
Vol 44 (48) ◽  
pp. 20999-21006
Author(s):  
Junda Wu ◽  
Atian Xie ◽  
Jin Yang ◽  
Jiangdong Dai ◽  
Chunxiang Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
Layer By Layer ◽  
Assembly Process ◽  
Water Separation ◽  
Water Emulsion ◽  
Pvdf Membrane ◽  
Inorganic Particles ◽  
Emulsion Separation ◽  
Oil Water Separation ◽  
Oil Water

A facile modification of a PVDF membrane using CaCO3 inorganic particles via a layer-by-layer self-assembly process for efficient oil/water separation.

scholarly journals 2D and 3D Bulk Materials for Environmental Remediation: Air Filtration and Oil/Water Separation

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5714
Author(s):  
Ha-Jin Lee ◽  
Won San Choi
Keyword(s):  
Future Research ◽  
Oily Wastewater ◽  
Air Filtration ◽  
Bulk Materials ◽  
Water Separation ◽  
Air Filters ◽  
Technical Problems ◽  
Oil Water Separation ◽  
Oil Water ◽  
2D And 3D

Air and water pollution pose an enormous threat to human health and ecosystems. In particular, particulate matter (PM) and oily wastewater can cause serious environmental and health concerns. Thus, controlling PM and oily wastewater has been a great challenge. Various techniques have been reported to effectively remove PM particles and purify oily wastewater. In this article, we provide a review of the recent advancements in air filtration and oil/water separation using two- and three-dimensional (2D and 3D) bulk materials. Our review covers the advantages, characteristics, limitations, and challenges of air filters and oil/water separators using 2D and 3D bulk materials. In each section, we present representative works in detail and describe the concepts, backgrounds, employed materials, fabrication methods, and characteristics of 2D and 3D bulk material-based air filters and oil/water separators. Finally, the challenges, technical problems, and future research directions are briefly discussed for each section.

Synthesis of graphene oxide–SiO2 coated mesh film and its properties on oil–water separation and antibacterial activity

2015 ◽  
Vol 73 (5) ◽  
pp. 1098-1103 ◽  
Author(s):  
Jun Liu ◽  
Wanxia He ◽  
Peng Li ◽  
Siying Xia ◽  
Xiaomeng Lü ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Environmental Stability ◽  
Layer By Layer ◽  
Oily Wastewater ◽  
Separation System ◽  
Water Separation ◽  
Silica Coatings ◽  
Oil Water Separation ◽  
Oil Water ◽  
Harsh Conditions

Oil–water separation has recently become a worldwide challenge due to the frequent occurrence of oil spill accidents and increasing industrial oily wastewater. In this work, the multifunctional mesh films with underwater oleophobicity and certain bacteriostatic effects are prepared by layer-by-layer assembly of graphene oxide-silica coatings on stainless steel mesh. The mesh film exhibits excellent environmental stability under a series of harsh conditions. The new, facile and reusable separation system is proposed to achieve deep treatment of oily wastewater, and the oil collection rate can reach over 99%.

scholarly journals Micro/Nanoscale Structured Superhydrophilic and Underwater Superoleophobic Hybrid-Coated Mesh for High-Efficiency Oil/Water Separation

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1378
Author(s):  
Teng Yuan ◽  
Jian Yin ◽  
Yingling Liu ◽  
Weiping Tu ◽  
Zhuohong Yang
Keyword(s):  
Contact Angle ◽  
Surface Topography ◽  
Cross Linking ◽  
Permeate Flux ◽  
Stainless Steel Mesh ◽  
Water Separation ◽  
Nano Sio2 ◽  
Binary Structure ◽  
Oil Water Separation ◽  
Oil Water

A novel micro/nanoscale rough structured superhydrophilic hybrid-coated mesh that shows underwater superoleophobic behavior is fabricated by spray casting or dipping nanoparticle–polymer suspensions on stainless steel mesh substrates. Water droplets can spread over the mesh completely; meanwhile, oil droplets can roll off the mesh at low tilt angles without any penetration. Besides overcoming the oil-fouling problem of many superhydrophilic coatings, this superhydrophilic and underwater superoleophobic mesh can be used to separate oil and water. The simple method used here to prepare the organic–inorganic hybrid coatings successfully produced controllable micro-nano binary roughness and also achieved a rough topography of micro-nano binary structure by controlling the content of inorganic particles. The mechanism of oil–water separation by the superhydrophilic and superoleophobic membrane is rationalized by considering capillary mechanics. Tetraethyl orathosilicate (TEOS) as a base was used to prepare the nano-SiO2 solution as a nano-dopant through a sol-gel process, while polyvinyl alcohol (PVA) was used as the film binder and glutaraldehyde as the cross-linking agent; the mixture was dip-coated on the surface of 300-mesh stainless steel mesh to form superhydrophilic and underwater superoleophobic film. Properties of nano-SiO2 represented by infrared spectroscopy and surface topography of the film observed under scanning electron microscope (SEM) indicated that the film surface had a coarse micro–nano binary structure; the effect of nano-SiO2 doping amount on the film’s surface topography and the effect of such surface topography on hydrophilicity of the film were studied; contact angle of water on such surface was tested as 0° by the surface contact angle tester and spread quickly; the underwater contact angle to oil was 158°, showing superhydrophilic and underwater superoleophobic properties. The effect of the dosing amount of cross-linking agent to the waterproof swelling property and the permeate flux of the film were studied; the oil–water separation effect of the film to oil–water suspension and oil–water emulsion was studied too, and in both cases the separation efficiency reached 99%, which finally reduced the oil content to be lower than 50 mg/L. The effect of filtration times to permeate flux was studied, and it was found that the more hydrophilic the film was, the stronger the stain resistance would be, and the permeate flux would gradually decrease along with the increase of filtration times.

scholarly journals Research of novel process route and scale-up based on oil-water separation flotation column

2017 ◽  
Vol 8 (1) ◽  
pp. 111-122 ◽  
Author(s):  
Gen Huang ◽  
Hongxiang Xu ◽  
Lun Wu ◽  
Xiaobing Li ◽  
Yongtian Wang
Keyword(s):  
Sewage Treatment ◽  
Aeration Rate ◽  
Optimum Operating ◽  
Operating Parameters ◽  
The Novel ◽  
Water Separation ◽  
Flotation Column ◽  
Oil Water Separation ◽  
Feeding Speed ◽  
Oil Water

Abstract A novel process ‘coalescence-airflotation-carrier preferential adsorption’ utilising an oil-water separation flotation column with a unique structure was used in the oil-water separation field. The oil-water separation flotation column contains the cyclonic separation and airflotation separation which has advantages in oily sewage treatment, especially in polymer-flooding-drive oily sewage treatment. In this paper, different dimensions of flotation column with 1 m3 d−1, 30 m3 d−1 and 2,000 m3 d−1 oil-water separation systems were investigated. In addition, several operating parameters which impact separation, such as feeding speed, aeration rate, circulating pressure, adsorbents consumption and frother consumption were also investigated. The optimum operating parameters determined for 1 m3 d−1 the oil-water separation flotation column were a feeding speed of 0.042 m3 h−1, an aeration rate of 0.10 m3 h−1, a coal consumption of 4 (g coal)·(g oil)−1, a frother consumption of 10 mg L−1, and a circulating pressure of 0.12 MPa. The novel process cost reduced 55.8% than conventional two-stage airflotation process. In the 2,000 m3 d−1 oil-water separation experiment, the oil concentration and the oil removal efficiency of outlet are 23.39 mgL−1, 97.70%, respectively. Sediment is not produced during the oily sewage treatment using the novel process and flotation column.

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