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Omid Moradi,Vinod Kumar Gupta,Shilpi Agarwal,Inderjeet Tyagi,Mohammad Asif,Abdel Salam Hamdy Makhlouf,Hamidreza Sadegh,Ramin Shahryari-ghoshekandi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Graphene (G) and Graphene oxide (GO) were employed in the present study for the removal of two toxiccationic dye Basic Red 12 (BR 12) and Basic Red 46 (BR 46), from aqueous solutions. Graphene oxide wassynthesized by Hummer–Offeman method, and then characterized by XRD (X-ray diffraction), and FT-IR(Fourier Transform Infrared spectroscopy). The influence of various physico-chemical parameters suchas electrical conductivity behaviors, contact time, solution pH, dye concentration and temperature werewell investigated and elucidated. The kinetics and thermodynamics of the toxic dye removal processwere also investigated; results clearly depicts that the kinetics of the removal of BR 12 and BR 46 using Gand GO as adsorbents follows a pseudo-second-order model. G and GO exhibited high-adsorptioncapacity for BR 12 and BR 46. The dye removal depends on the initial pH of the solution with themaximum uptake occurring at about pH 9. Moreover, the thermodynamic results confirmed thatadsorption of dye BR 46 on G and GO were exothermic and adsorption of dye BR 12 on G and GO wereendothermic in nature. The electrical conductivity behaviors of the aqueous solution were found to beenhanced by oxidation of graphene.
Moradi, Hiresh,Atashi, Peyman,Amelirad, Omid,Yang, Jae-Kyu,Chang, Yoon-Young,Kamranifard, Telma Techno-Press 2022 Advances in nano research Vol.12 No.4
Silica nanoparticles, which have a broad range of sizes and specific surface features, have been used in many industrial applications. This study was conducted to synthesize monodispersed silica nanoparticles directly from tetraethyl orthosilicate (TEOS) with an alkaline catalyst (NH<sub>3</sub>) based on the sol-gel process and the Stöber method. A central composite design (CCD) is used to build a second-order (quadratic) model for the response variables without requiring a complete three-level factorial experiment. The process was then optimized to achieve the minimum particle size with the lowest concentration of TEOS. Dynamic light scattering and scanning electron microscopy were used to analyze the size, dispersity, and morphology of the synthesized nanoparticles. After optimization, a confirmation test was carried out to evaluate the confidence level of the software prediction. The results revealed that the predicted optimization is consistent with experimental procedures, and the model is significant at the 95% confidence level.
Fatemeh Abbaszadeh,Omid Moradi,Mehdi Norouzi,Omid Sabzevari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The functionalized carbon nanotubes play significant roles in the fields such as preparation of composite materials and biological technologies. This paper explains the covalent functionalization of single-wall carbon nanotubes (SWCNTs) with biomedical important monomers, 2-hydroxyethylmethacryate (HEMA) and N-vinylpyrrolidone (NVP) by chemical grafting of HEMA and PVP monomers via free radical polymerization. To get carboxylic acid functionalized SWCNTs, first the nanotubes were oxidized with a mixture of nitric acid and sulfuric acid (1:3). Then, the binding of HEMA and NVP onto the surface of SWCNTs was performed by chemical functionalization of HEMA, NVP with acid chloride-bound carbon nanotube by esterification reaction. These results were confirmed by FT-IR and SEM. The cell culture experiments conducted for pharmaceutical applications were used as cancer therapy.
Mania Setareh Derakhshan,Omid Moradi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The effective removal of dyes from aqueous wastes is among the most important issues for many industrialized countries. Removal of methyl orange (MO) and malachite green (MG) from aqueous solutions were studied using single-walled carbon nanotubes (SWCNTs), carboxylate functionalized single-walled carbon nanotubes (SWCNT-COOH) and amide functionalized single-walled carbon nanotubes (SWCNT-NH2). The adsorption process was found to be controlled by temperature, ionic strength, initial concentration, adsorbent dosage and contact time. The microstructure of carbon nanotubes was characterized using SEM and FTIR. The adsorbents studied exhibits high efficiency for MO and MG adsorption and the equilibrium states could be achieved in 20, 20, 15 (min) for SWCNTs, SWCNTCOOH, SWCNT-NH2, respectively. Adsorption capacity of each adsorbent increased with increasing active groups on the surface of carbon nanotube, where SWCNT-NH2 was the most effectively adsorbent.
Ali Hosseinian Naeini,Mohammadreza Kalaee,Omid Moradi,Ramin Khajavi,Majid Abdouss 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.8
Biopolymers, such as Carboxyl methylcellulose (CMC) and Guar gum (GG), have attracted much attention. Herein, binary organic composite (Carboxyl methyl cellulose - Guar gum) and ternary inorganic-organic ecofriendlybionanocomposite (Copper oxide - Carboxyl methyl cellulose - Guar gum) with different wt% of CuO (1%,3%, and 5% denoted as CMC/GG/CuO-1, CMC/GG/CuO-3, and CMC/GG/CuO-5) were prepared. The CMC, GG,CuO, CMC/GG, CMC/GG/CuO-1, CMC/GG/CuO-3, and CMC/GG/CuO-5 were characterized by XRD, FTIR, SEM,and EDX and used to remove malachite green (MG) dye from water. The effect of operational parameters on theadsorption process was investigated in detail. The maximum dye capacity was 18.5mg/g. The isotherm data showedthe Freundlich isotherm, which indicated the non-uniformity of adsorption on the adsorbent surface. Pollutant removalfollowed the pseudo-second-order kinetics. Also, the thermodynamic study presented that adsorption was spontaneousand endothermic.