Browsing by Author "Hojamberdiev, Mirabbos"
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Item Hydrophobicity and polymer compatibility of POSS-modified Wyoming Na-montmorillonite for developing polymer-clay nanocomposites(Elsevier, 2017-03-05) Hojamberdiev, Mirabbos; Çelik, Mehmet S.; Carty, William M.; Hojiyev, Rustam; Ulcay, Yusuf; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 000-0002-2047-3169; 36026524100; 6601918936The aim of the present work was to investigate the hydrophobicity and polymer compatibility of aminopropylisooctyl polyhedral oligomeric silsequioxane (POSS) - modified Na-montmorillonite (Na-MMT) towards developing polymer-clay nanocomposites. The effect of different concentrations of POSS on properties of Na-MMT was studied. The intercalation ability of the POSS molecules into the Na-MMT interlayer was analyzed by X-ray diffraction. It was found that the d(001) value was increased with increasing the POSS concentration, indicating the successful intercalation of the POSS molecules into the Na-MMT interlayer. The d(001) value was 4.12 nm at 0.4 cation exchange capacity (CEC) loading of POSS, increased at a slight rate upon further increase of CEC loading, and finally reached 4.25 nm at 1.0 CEC loading of POSS. The results of the thermogravimetric (TGA) analysis confirmed the high thermal stability of the POSS-MMT. The thermal stability was defined as a 5% mass loss (T-5) at 0.2 CEC loading of POSS was observed at 352 degrees C and slightly decreased with further increase in the POSS concentration. The porous properties, such as specific surface area (SSA), pore volume, and pore size were estimated by the adsorption of N-2 molecules on the Na-MMT surface. The SSA and pore volume were reduced with increasing the concentration of the POSS molecules due to the adsorption of the POSS molecules on the Na-MMT, while the pore size was increased upon the formation of macroporous structure. The interfacial interaction energy between water and POSS-MMT (Delta G(Clay/Water/Clay)(IF)) was used to evaluate the surface hydrophobicity, and a similar approach was also applied to assess the polymer compatibility of the developed composite. The obtained results confirm that the polymer compatibility of POSS-MMT prepared in this study is better than that of commonly used HDTMA-MMT.Item Simultaneous removal of NH4+, H2PO4- and Ni2+ from aqueous sMark solution by thermally activated combinations of steel converter slag and spent alumina catalyst(Elsevier, 2015-12-01) Kadirova, Zukhra C.; Hojamberdiev, Mirabbos; Bo, Longli; Okada, Kiyoshi; Hojiyev, Rustam; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; GCT-0509-2022; 36026524100Industrial wastes (spent alumina catalyst and steel converter slag) were utilized to prepare low-cost inorganic sorbents by thermal activation at temperatures ranging from 500 to 1000 degrees C. According to the results of X-ray diffraction analysis, high-temperature thermal activation of mixtures of spent alumina catalyst and steel converter slag in different ratios leads to the formation of new crystalline phases. The Ni2+, H2PO4- and NH4+ sorption properties of the prepared samples were investigated in separate batch experiments, employing initial analyte concentration of 10 mmol L-1. The steel converter slag samples calcined at 500 degrees C and 900 degrees C and the mixed sample (70% spent alumina catalyst and 30% steel converter slag) calcined at 1000 degrees C exhibited maximum ion sorption capacities of 3.56 mmol Ni2+ g(-1), 3.28 mmol H-2 PO4+ g(-1) and 2.21 mmol NH4+ g(-1), respectively. The principal mechanisms of Ni2+ sorption were the substitution of Ca2+ ions by Ni2+ ions, precipitation at high pH and sorption on Fe3O4 and SiO2 surfaces present in the samples. The H2PO4-sorption was due mainly to the formation of calcium phosphates and sorption on Fe2O3 and SiO2 surfaces, whereas the removal of NH4+ involved sorption on Al2O3 surfaces of the prepared samples. The results of the kinetics calculations showed that a second-order kinetic model offers a good fit for the present experimental data. The materials prepared from low-cost industrial wastes in this work have the ability to simultaneously remove NH4+, H-2 PO(4)(-)and Ni2+ ions from aqueous solution.