جستجوی مقالات مرتبط با کلیدواژه "نانو چندسازه" در نشریات گروه "شیمی"

In this study, after the preparation of unsaturated polyester with various ratios of anhydride monomers, the effects of nano silicate on the polymerization, curing behavior, and mechanical properties were investigated. The unsaturated polyester resin was synthesized at various molar ratios of anhydride monomers (maleic/phthalic: 10 to 90%) and propylene glycol. Acid number measurement was used to evaluate polymerization. With an increase in the molar maleic content, the time of polymerization reaction and the acidic number increased. In the next step, the resin was cured with an accelerator and initiator, and styrene monomer. curing behavior was determined using a curing curve and gelation time measurement. The curing curve showed that by increasing the maleic anhydride monomer ratio from 10% to 90%, the curing time decreased by 77%, and the maximum thermogenic temperature increased by 24%. Increasing the maleic content from 10 to 90% resulted in tensile strength changes from 11 to 70 MPa and tensile modulus from 60 to 359 MPa. The impact strength and the heat distortion temperature increased and became plateaued at higher maleic percentages. The nanocomposites were prepared with 50 mol% maleic anhydrides, containing 2, 4, 6, and 8 wt.% of nano silicate. By increasing the amount of nanoclay, the curing time decreased and the maximum exothermic temperature increased. Mechanical properties were evaluated by using Heat Deflection Temperature (HDT), tensile properties, impact strength, and surface hardness tests. The impact strength and the heat distortion temperature also showed an upward trend with an increase in the amount of nano, even in small quantities. By adding 8% nanoclay to the matrix, the impact strength and heat deflection temperature increased by 11% and 13%.

Dyes colors are one of the most important organic pollutants in the industry which cause a lot of environmental problems. Therefore, the determination and removal of dyes from aqueous effluents is one of the most significant environmental importance. The aim of the present study was to investigate the potential of applicability of CoFe2O4 nanoparticles loaded on activated carbon (AC) (CA-CoFe2O4) for the removal and adsorption of Chrysoidine in water samples. In this research, nanocomposite (CA-CoFe2O4) was prepared. Then, the properties of sorbent (nanocomposite) are characterized by Energy Dispersive Xray Spectroscopy (EDS), and Scanning Electron Microscope (SEM) techniques. In this study, nanoparticles are dispersed in aqueous media by ultrasonic were to facilitate the dispersion of the sorbent. The CA-CoFe2O4containing the extracted dyes was separated from the sample aqueous by centrifuge. The residual Chrysoidine G concentrations were determined by UV-Vis spectroscopy. The factors affecting such as pH, ultrasonic time, adsorbent mass and initial Chrysoidine G concentration on the Chrysoidine G removal of CA-CoFe2O4 was investigated. The experimental results also showed that the adsorption followed with pseudo second-order kinetics model, and the adsorption behavior was accordance with the Freundlich isotherm model. Also, the adsorption capacity of 28.57 mg/g was achieved by CA-CoFe2O4.

Dyes colors are one of the most important organic pollutants in the industry which cause a lot of environmental problems. Therefore, the determination and removal of dyes from aqueous effluents is one of the most significant environmental importance. The aim of the present study was to investigate the potential of applicability of COFe2O4 nanoparticles loaded on activated carbon (AC) (CA-COFe2O4) for the removal and adsorption of Chrysoidine in water samples. In this research, nanocomposite (CA-COFe2O4) was prepared. Then, the properties of sorbent (nanocomposite) are characterized by Energy Dispersive X-ray Spectroscopy (EDS), and Scanning Electron Microscope (SEM) techniques. In this study, nanoparticles are dispersed in aqueous media by ultrasonic were to facilitate the dispersion of the sorbent. The CA-COFe2O4containing the extracted dyes was separated from the sample aqueous by centrifuge. The residual Chrysoidine G concentrations were determined by UV-Vis spectroscopy. The factors affecting such as pH, ultrasonic time, adsorbent mass and initial Chrysoidine G concentration on the Chrysoidine G removal of CA-COFe2O4 was investigated. The experimental results also showed that the adsorption followed with pseudo second-order kinetics model, and the adsorption behavior was accordance with the Freundlich isotherm model. Also, the adsorption capacity of 28.57 mg/g was achieved by CA-COFe2O4.