Person: ERDEM, SEZER
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ERDEM
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SEZER
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Publication Cationic surfactant templated synthesis of magnetic mesoporous nanocomposites for efficient removal of Light Green(Korean Institute Chemical Engineers, 2021-06-22) Erdem, Beyhan; Erdem, Sezer; Tekin, Nalan; ERDEM, BEYHAN; ERDEM, SEZER; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü; AAI-1238-2021; AAI-1248-2021Fe3O4-SiO2-NH2, Fe3O4-CTABSiO(2)-NH2 and Fe3O4-SiO2-CTABSiO(2)-NH2 magnetic adsorbents were successfully prepared and could be used effectively for the adsorption of Light Green from aqueous solutions. Unlike the first sample, mesoporous silica coatings were created using cetyltrimethylammoniumbromide micelles as molecular templates on superparamagnetic iron oxide in one sample, and on silica-coated iron oxide in the other sample to improve the adsorptive properties of the nanocomposites. The characterization by FT-IR, SEM/EDX, Zeta-potential, XRD, VSM, and N-2-adsorption/desorption confirmed the production of mesoporous silica layer. Although coating processes with both silica and mesoporous silica layers led to a vaguely decrease in saturation magnetization of the Fe3O4-SiO2-CTABSiO(2)-NH2, the nanoparticles were protected with silica coatings for environment conditions and made more suitable for subsequent amino functionalization. The results determined from Batch adsorption experiments fitted to Langmuir isotherm model with maximum adsorption capacity (q(max)) equal to 56.18, 196.08 and 227.27 mg g(-1), for Fe3O4-SiO2-NH2, Fe3O4-CTABSiO(2)-NH2 and Fe3O4-SiO2-CTABSiO(2)-NH2, respectively, and it was seen from the kinetic results, the LG adsorption was identified by pseudo-second-order kinetics, revealing that LG adsorption process is homogeneous, monolayer and based on chemical interactions. According to the results, both silica and mesoporous silica coating strategy can play crucial role in improving the adsorptive properties of nanocomposites.Publication Adsorption of light green and brilliant yellow anionic dyes using amino functionalized magnetic silica (Fe 3 O 4 @SiO 2 @NH 2) nanocomposite(Taylor, 2019-01-01) Erdem, Beyhan; Avşar, Saliha Buşra; Erdem, Sezer; Tekin, Nalan; ERDEM, BEYHAN; Avşar, Saliha Buşra; ERDEM, SEZER; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; AAI-1238-2021; AAI-1248-2021; CDX-3142-2022Fe3O4@SiO2@NH2 nanocomposite was prepared for highly effective adsorption of two anionic dyes one of which is triarylmethane dye (light green, LG) and the other is azo dye (brilliant yellow, BY). The characterization results demonstrated that superparamagnetic Fe3O4 nanoparticles were covered with silica and functionalized with amino groups successfully without losing magnetic character. The effects of adsorbent dosage, contact time, pH, temperature, and dye molecular structure on the adsorption were investigated. Acidic pH was better for both LG and BY, on the other hand, alkaline pH was favorable to some extent for LG in comparison with BY due to the contribution of stacking effect in addition to electrostatic attraction. Kinetic data demonstrated that the driving force for adsorption process could be explained by pseudo-second order mechanism in both systems. The equilibrium data were more compatible with Langmuir isotherm than those of Freundlich isotherm and the maximum adsorption capacities of Fe3O4@SiO2@NH2 calculated from Langmuir isotherm model for LG and BY at 30 degrees C and natural pH of the solution were 40.2 and 35.5 mg g(-1). Thermodynamic calculations related to temperature dependence demonstrated that the adsorption process was spontaneous and exothermic.Publication Effect of calcination temperature on the structural and magnetic properties of Ni/SBA-15 nanocomposite(Springer, 2015-06-01) Erdem, Sezer; Erdem, Beyhan; Öksüzoğlu, Ramis Mustafa; Çitak, Alime; ERDEM, SEZER; ERDEM, BEYHAN; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü; AAI-1238-2021; AAI-1248-2021The effect of calcination temperature on the structural and magnetic properties of Ni/SBA-15 nanocomposite prepared by reductant-impregnation method was studied using SBA-15 mesoporous silica as support. The structure, morphology and magnetic properties of the samples were characterized using X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray spectrometry, N-2 adsorption/desorption (BET and BJH), vibrating sample magnetometer, and FT-IR. Characterization results showed the presence of crystalline phases characteristics of the Ni and/or NiO, and that the structural characteristics of the support were maintained after the impregnation of nickel ions followed by calcinations. Calcination process helps in crystallization and formation of the desired phase such as well crystalline NiO and Ni nano-particles. Moreover, this heat resulted in significant effects on different properties of the products such as the crystallite size, homogeneity, particle distribution, porosity, surface area and the sintering process. Magnetic measurements suggested that the magnetic properties in nanocomposites is probably the sum of two contributions: superparamagnetic and ferromagnetic one depending on the calcination temperature. Calcination at high temperatures affects both of the structural and magnetic properties of Ni/SBA-15. Because the location of the Ni particles depends on the pore size of the support, the uniformity of particle size was related to the interaction between the Ni particles and support.Publication Synthesis, analysis, and characterizations to investigate the influence of ni dopant on the structural and magnetic properties of Co Fe 2 O4 nanoparticles confined within the mesoporous silica SBA-15 matrix(Springer, 2023-12-10) Erdem, Sezer; ERDEM, SEZER; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; AAI-1248-2021This study designates the synthesis and characterization of undoped and Ni-doped CoFe2O4 nanoparticles within the highly ordered nanoscale channels of mesoporous silica SBA-15 matrix by using two-step nanocasting process. The impact of Ni doping in the structural and magnetic properties of CoFe2O4/SBA-15 nanocomposite was investigated by XRD, FT-IR, FESEM/EDX, N-2-adsorption/desorption, and VSM techniques. XRD studies have depicted that Ni doping results in pure ferrite phase with crystallite size decreasing from 11.8 to 10.2 nm and lattice constant's reduction due to smaller ionic radii of the nickel ions as against cobalt ions. The formation of metal-oxygen complexes located in the spinel lattice was proved by FT-IR spectroscopy which exhibits two main absorption bands belonging to the tetrahedral and octahedral sites. Compared with CoFe2O4/SBA-15, Ni0.5Co0.5Fe2O4/SBA-15 nanocomposite possesses higher BET surface area and pore volume due to creation of additional porosity in the mixed ferrite sample. The surface morphology of the CoFe2O4/SBA-15 and Ni0.5Co0.5Fe2O4/SBA-15 nanocomposites, as measured by FESEM, indicates the fiber-like aggregates consisting of relatively uniform short rod-shaped grains. Ni doping is observed to influence the ferromagnetic behavior significantly, while the saturation magnetization gets reduced from 18.12 to 12.74 emu/g which is associated with the lower orbital contribution to magnetic moment of Ni2+ ions in as against Co2+ ions, conversely, the coercivity gets increased from 158 to 249 Oe, which suggests the hardening of the magnetic material, which may be due to the increase in surface anisotropy resulted from the matrix effect. Therefore, the present study notifies the potential magneto-electronic applications of Ni0.5Co0.5Fe2O4/SBA-15 nanocomposite, with the realization of controllable size and magnetic properties along with SBA-15 matrix.