Improving of the Mg-Co nanoferrites efficiency for crude oil adsorption from aqueous solution by blending them with chitosan hydrogel

The efficiency of the as-prepared Mg0.25Co0.75Fe2O4 spinel nanoparticles for adsorption of crude oil from aqueous solution was improved by blending them with chitosan hydrogel (CH) prepared using epichlorohydrin as cross-linker resulting (CH/ Mg0.25Co0.75Fe2O4) nanocomposites. Mg0.25Co0.75Fe2O4 nanocrystals was prepared by the chemical co-precipitation method and characterized by using X-ray diffraction (XRD), infrared spectroscopy (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM), and differential thermal analysis (DTA)/thermogravimetric analysis (TGA). DTA/ TGA results showed that the net weight loss of the samples heated from room temperature up to 1000 °C lies in the range 2.2–26.5% weight, where the maximum weight loss appeared at 100 °C and 614 °C. The blending nanocomposites prepared, were characterized by FT-IR and SEM micrographs. The effect of the nanoparticles ratio on the water uptake of nanocomposites and their capability to adsorb the crude oil was estimated by the gravimetric method. TEM results showed that the average nanoparticle size (Z) of Mg0.25Co0.75Fe2O4 is 30.06 nm and the SEM illustrated the presence of a very clear and rough layer of pores which are homogenously arranged structures that could play an important role in the adsorption and stability of crude oil on polymers. The adsorption ability of crude oil from waste water on the CH/Mg0.25Co0.75Fe2O4 nanocomposites hydrogel was reported and it was found that the CH/Mg0.25Co0.75Fe2O4 with 95/5% ratio showed the improvement in the oil adsorption (72.5%) than the 0/100% one (50.2%). As a consequence, it is highly suggested that the potential of blending CH with Mg0.25Co0.75Fe2O4 to obtain CH/Mg0.25Co0.75Fe2O4 for enhancing crude oil adsorption in oily waste water treatment with a low cost

Synthesis and Characterization of Some Conducting Polymers and Their Complexed Compounds

The chemical co-polymerization of aniline with o-anthranilic acid (AA) to form copolymer films has been made in aqueous hydrochloric acid medium. Poly vinylcarbazole (PVK) was prepared by free radical mechanism. The copolymer (AA) and polymer (PVK) were reacted with KI respectively, to produce a complex compounds. Also, the complex of copolymer (AA) with NaOEt was prepared. The conductivity, IR spectra and the thermal gravimetric analysis of these polymers and their complexes were measured and discussed. It was found that, the specific electrical conductivity (σ) of the copolymer (AA) in presence of NaOEt increases with increase in temperature, whereas decreases with complex of copolymer (AA) +KI. The electrical properties of the PVK were enhanced upon reacting it with KI

Characterization of Rigid Polyurethane Foam Prepared from Recycling of PET Waste

Poly (ethylene terephthalate) (PET) waste bottles were recycled to prepare RPUFs (rigid polyurethane foams) by using propylene glycol (PG) in different glycol/polymer molar ratios. The glycolysis products were characterized, after that, they reacted with poly methylene diphenyl diisocyanate (PMDI) in the presence of blowing, co-blowing and second blowing agents to produce the RPUFs. The prepared foams were characterized and compared to foam that is produced by original polyol. It was found that the glycolysis products have possibility for the fabrication of RPUFs with proper properties depending on the blowing agent type and density, also they have similar thermal stability compared to that one produced by original polyol. This may provide an advantage in the future planning for recycling of PET bottles to enhance the mechanical and thermal properties of PU

Comparison between the electrical properties of polyphenylacetylene and polyaminotriazole

The electrical properties of a polymer containing aromatic rings were compared with those of polyheterocyclic compound. Each segment of the polyheterocyclic compound contains three nitrogen atoms. Both polymers were prepared at the laboratory. It was found that the specific electrical conductivity of polyphenylacetylene is higher than that of polyaminotriazole. Log ρ vs. 103/T was traced for both compounds, where ρ is the specific electrical resistivity and T is the absolute temperature. Complexes of each compound with KI were prepared. The electrical properties of these complexes were studied. The microstructure of both compounds was determined by FTIR spectroscopy