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

Abstract

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.

Removal of Heavy Metal Ions from Aqueous Solution by Nano Graphene Oxide

“…After preparing the samples in the flaxes, installing them in the shaker, and configuring the shaker's temperature, the treatment procedure starts by changing the agitation speed and continuing until the designated time expires. Conditions employed for the acidic function were (2)(3)(4)(5)(6)(7)(8), agitation speed (75-375) RPM, (0.01-1) g of GO, contact time (10-180) minutes, and temperature (20-50) °C, respectively. After the time has expired, the shaker is turned off, the flasks are removed, and the samples are filtered using Filter Paper.…”

“…1 Water pollution can take on a variety of forms, including toxicity caused by inorganic wastes, pesticides, or detergents, as well as pollution caused by food enrichment, thermal pollution, and contamination with oil materials from extraction residues, oil refineries, and other industrial wastewater sources. 2 Heavy metals such as lead, cadmium, nickel, vanadium, and iron are present in most Iraqi crude oil types, and oil refinery wastes including these heavy metals are one of the most serious pollutants that must be addressed because of the severe impact that their accumulation has on human and animal health, as well as plant. 3 Among all the previous techniques and methods used to treat heavy metal-contaminated wastewater, adsorption is considered one of the most important of these technologies due to its high efficiency in this field and the simplicity of the technology used for this purpose compared to other methods, as well as its reasonable economic cost.…”