scholarly journals Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

2020 ◽  
Vol 14 (4) ◽  
pp. 531-537
Author(s):  
The-Anh Phan ◽  
◽  
Kim-Hoang Dang ◽  
Lam Nguyen-Dinh ◽  
◽  
...  
Keyword(s):  
Sorption Capacity ◽  
High Selectivity ◽  
Cell Structure ◽  
Polymeric Materials ◽  
Alkaline Condition ◽  
Melamine Formaldehyde ◽  
Simple Method ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

Hydrophobic porous polymeric materials have attracted great interests recently as potential candicate for oil-water separation due to their high selectivity and sorption capacity. Herein, we present a green, simple and cost-effective method to change hydrophilic melamine formaldehyde (MF) foam to hydrophobic carbon nanotubes (CNTs) coated MF foam through an immersion process. The MF foam was produced from the MF resin which was synthesized in a laboratory by a condensation reaction between melamine and formaldehyde under alkaline condition with a molar ratio of melamine to formaldehyde of 1:3. The MF foam has an open-cell structure with the average pore diameter of 350 m, density of 25 kg •m-3 and porosity of 98 %. The as-prepared CNTs-coated MF foam exhibits high sorption capacity (23–-66 g/g) for oils and organic solvents, good recyclability and high selectivity.

Using a simple method to prepare UiO‐66‐NH 2 /chitosan composite membranes for oil–water separation

2021 ◽  
pp. 50765
Author(s):  
Ximei Zhu ◽  
Zongxue Yu ◽  
Haojie Zeng ◽  
Xiaofang Feng ◽  
Yuchuan Liu ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Simple Method ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Chitosan Composite

Bifunctional MoS2 coated melamine-formaldehyde sponges for efficient oil–water separation and water-soluble dye removal

2017 ◽  
Vol 9 ◽  
pp. 551-559 ◽  
Author(s):  
Zuteng Wan ◽  
De Li ◽  
Yanli Jiao ◽  
Xiaoping Ouyang ◽  
Lingqian Chang ◽  
...  
Keyword(s):  
Dye Removal ◽  
Water Soluble ◽  
Melamine Formaldehyde ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

A multi-function textile with pH-induced switch wettability transition for controllable oil−water separation

2021 ◽  
pp. 004051752110569
Author(s):  
Long Feng ◽  
Yimiao Hou ◽  
Qingqing Hao ◽  
Mingxing Chen ◽  
Shuo Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Separation Efficiency ◽  
Nonwoven Fabric ◽  
Dip Coating ◽  
Municipal Sewage ◽  
Alkaline Condition ◽  
Separation Performance ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

The deterioration of water ecology caused by the discharge of oil spill wastewater, industrial sewage, and municipal sewage has attracted wide attention worldwide. Thus, it is significant to design a simple, environmentally friendly approach to separate oil–water mixtures. In this work, three different fabrics with pH-induced wettability transition were prepared by a dip-coating process for oil and water separation. The dip-coating fabrics had the advantages of oil–water separation, photocatalytic degradation, and recycling. Polyethylene terephthalate/polyamide nonwoven fabric was used as the substrate materials of the fabric. The carboxylic acid-modified TiO2 endowed the fabric with hydrophilicity–hydrophobicity and photocatalytic properties. The Fe3O4 nanoparticles obtained by the coprecipitation method provided magnetism for the fabric, facilitating the recycling of the fabric and improving the hydrophobicity of the fabric. The fabrics coated with dipping solutions were superhydrophobic in a neutral environment and hydrophilic in an alkaline environment. Among the three coated fabrics, the fabric coated with stearic acid/TiO2-Fe3O4 (FST) had the most satisfying oil–water separation performance and durability. Under the neutral condition, the contact angle of the FST was 151° and the separation efficiency was 98%. Under the alkaline condition, the underwater oil contact angle of the FST was 150° and the separation efficiency was 95%. After 15 cycles, the oil–water separation rate of the FST was still higher than 90%. Due to the presence of TiO2, the coated fabric had an exceptional performance in the photodegradation of organic pollutants (69.9%). In addition, the fabrics can be quickly recovered due to magnetism.

scholarly journals One-Step Synthesis of Environmentally Friendly Superhydrophilic and Superhydrophobic Sponges for Oil/Water Separation

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1182 ◽  
Author(s):  
Yo Seph Lee ◽  
Yong Taek Lim ◽  
Won San Choi
Keyword(s):  
Calcium Carbonate ◽  
Mechanical Stability ◽  
Environmentally Friendly ◽  
Absorption Capacity ◽  
Melamine Formaldehyde ◽  
Water Separation ◽  
Stability Tests ◽  
Oil Water Separation ◽  
One Step ◽  
Oil Water

Environmentally friendly superhydrophilic and superhydrophobic sponges were synthesized using a one-step approach for oil/water separation. A superhydrophilic or superhydrophobic sponge (MFS/CC-DKGM or MFS/CC-PDMS) was synthesized by one-step coating of melamine formaldehyde sponge (MFS) with a mixture of calcium carbonate (CC) rods and deacetylized Konjac glucomannan (DKGM) [or polydimethylsiloxane (PDMS)]. The MFS/CC-PDMS showed excellent absorption capacity, which reached 52–76 g/g following immersion into various types of oil/water mixtures. Furthermore, the MFS/CC-DKGM and MFS/CC-PDMS exhibited excellent water- and oil-flux performances, which reached 4,702 L/m2 h and 19,591 L/m2 h, respectively, when they were used as filters. The MFS/CC-DKGM and MFS/CC-PDMS maintained their wettability characteristics relatively well after the chemical, thermal, and mechanical stability tests.

One-step synthesis of a robust and anti-oil-fouling biomimetic cactus-like hierarchical architecture for highly efficient oil/water separation

2020 ◽  
Vol 7 (3) ◽  
pp. 903-911 ◽  
Author(s):  
Lei Zhu ◽  
Hui Li ◽  
Yingying Yin ◽  
Zhaozhen Cui ◽  
Chao Ma ◽  
...  
Keyword(s):  
Hierarchical Architecture ◽  
Oily Wastewater ◽  
Simple Method ◽  
Water Separation ◽  
Highly Efficient ◽  
Oil Water Separation ◽  
One Step ◽  
Oil Water ◽  
Oil Fouling

It is of great significance to develop novel superhydrophilic/underwater superoleophobic materials using a facile and simple method for efficiently separating oily wastewater.

A fast and convenient cellulose hydrogel-coated colander for high-efficiency oil–water separation

RSC Advances ◽  
2014 ◽  
Vol 4 (61) ◽  
pp. 32544-32548 ◽  
Author(s):  
Fei Lu ◽  
Yuning Chen ◽  
Na Liu ◽  
Yingze Cao ◽  
Liangxin Xu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Simple Method ◽  
Water Separation ◽  
Cellulose Hydrogel ◽  
Oil Water Separation ◽  
Oil Water

A simple method to prepare a cellulose-coated colander that can scoop floating oil.

scholarly journals Modification of Polyurethane Sponge Based on the Thiol–Ene Click Reaction and Its Application for Oil/Water Separation

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2072 ◽  
Author(s):  
Liping Liang ◽  
Yanyan Dong ◽  
Yuqing Liu ◽  
Xu Meng
Keyword(s):  
Click Reaction ◽  
Uv Light ◽  
Homogeneous Solution ◽  
Absorption Capacity ◽  
Mercaptoacetic Acid ◽  
Simple Method ◽  
Water Separation ◽  
Polyethylene Glycol Diacrylate ◽  
Oil Water Separation ◽  
Oil Water

A polyurethane (PU) sponge with hydrophobic/oleophilic property was prepared based on the thiol–ene click reaction, which was a simple method with only one step. Photopolymerization was induced through UV light on the sponge surface in a homogeneous solution containing polyethylene glycol diacrylate, pentaerythritol (mercaptoacetic acid) ester, 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone, and octadecyl methacrylate. The as-prepared sponge possessed excellent selective for oil from various types of oil/water mixtures. It also had a high absorption capacity for toluene, >21 times its self-weight, and it had about 20 times its self-weight for vegetable oil, even after five extrusion–adsorption cycles, presenting a good recyclability. It created a new method to prepare oil/water separation sponge.

Sign in / Sign up

Export Citation Format

Share Document