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RISS 인기검색어
- 검색키워드
- 저자 : Mehdi Mahmoudian (검색결과 2 건)
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Mehdi Mahmoudian,Ehsan Nozad,Mohammadtaghi Hosseinzadeh 한국고분자학회 2018 폴리머 Vol.42 No.3
In this study, functionalized graphene oxide was prepared by surface grafting of ethylenediaminetetraacetic acid (EDTA) to graphene oxide (GO) surface using ethylenediamine as linking agent and was introduced into polyethersulfone membrane matrix. Grafting of ethylenediaminetetraacetic acid to graphene oxide was confirmed by Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and X-ray diffraction. The characteristics of prepared nanocomposite membranes were investigated using FESEM and contact angle measurements. The performance of the nanocomposite membranes was investigated in detail for water permeability, salt rejection and protein antifouling test. Also, the performance of membranes in the elimination of several heavy metals and dyes was investigated. The results confirm the significant improvement of hydrophilicity in the modified membranes and a remarkable increase in the salt, heavy metal and dye rejection was achieved.
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Niko Faraji,Mehdi Mahmoudian,Asghar Zamani 한국고분자학회 2024 폴리머 Vol.48 No.1
In this research, the nanofibrous polystyrene /titanium dioxide nanotube (PS/TiO2 nanotubes) membrane was prepared by the electrospinning method. Titanium dioxide nanotubes were synthesized by the anodizing method and stabilized on the fibrous polystyrene membrane. Then, the effect of different weight percentages of titanium dioxide nanotubes on the performance of the resulting membranes was investigated. The nanoparticles and nano-composites prepared in this research were analyzed using several analyses, including Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FE-SEM), along with X-ray energy diffraction spectroscopy (EDS). The thermal behavior and crystal structure of prepared nano-composite membranes were investigated using (TGA) analysis and X-ray diffraction (XRD), respectively. Afterward, to investigate the prepared structures, analyses such as porosity measurement, water contact angle, swelling, and water flux of the membranes were performed. The photocatalytic property of the prepared membranes in the decomposition of methylene blue was investigated by two methods (static and dynamic). The obtained results demonstrated that the dye removal was accomplished in the best way in the static method (using the membrane as an absorbent) for 48 h. The prepared nano-composite membranes were also used in the dye filtration removal process, and the best result was obtained by using the membrane containing titanium dioxide nanotubes with a concentration, of 0.05 gr/V(50). The swelling degree in the fibrous polystyrene membrane was 135%, while in the membrane containing 0.1% titanium dioxide nanotubes, which is the optimal membrane, was 66%. Hydrophilicity measurements by water contact angle revealed that the presence of TiO2 nanotubes improved by about 10%.
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