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RISS 인기검색어
- 검색키워드
- 저자 : Tahereh Rohani-Bastami (검색결과 5 건)
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Tahereh Rohani Bastami,ALI AHMADPOUR,Fatemeh Ahmadi Hekmatikar 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
Magnetic Fe3O4/Bi2WO6 nanohybrids were prepared via a two-step approach. Fe3O4 nanospheres weresynthesized using a solvothermal method in polyol media and Bi2WO6 nanocrystals were formed by thesubsequent hydrothermal process. In the preparation process of Bi2WO6 nanoparticles, tungstophos-phoric acid hydrate (H3PW12O40) was used as an acidic agent. The activity of the photocatalyst wasevaluated by the photocatalytic degradation of ibuprofen (IBP) from an aqueous solution with solar light. The as-prepared nanohybrid, which could be easily recovered by a magnet, showed high efficiency inphotocatalytic degradation of IBP, especially at pH = 4.7.
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Nafiseh Sabzroo,Tahereh Rohani Bastami,Majid Karimi,Tahereh Heidari,Shilpi Agarwal,Vinod Kumar Gupta 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
This research describes the development of a new design of nanosorbents, magnetic poly(acrylonitrile-co-acrylic acid) (PAN-co-AA) nanofibers, for the pre-concentration of malachite green (MG) residues in water samples via dispersive magnetic solid phase extraction (d-MSPE) technique. After pre-concentration, the spectrophotometric method was used to determine MG. Magnetic PAN-co-AA nonwoven nanofibers was fabricated by the optimized electrospinning technique after optimization of electrospinning conditions. According to the results, increasing magnetic nanoparticles (MNPs) into polymeric matrix led to significant reduction of fiber diameter from 360 to 70 nm. This change was associated with an increase in nanofibers surface area (from 9.66 m2 g−1 to 12.09 m2 g−1). Fabricated magnetic nanofibers demonstrated suitable magnetic properties (3.6 emu g−1), so it can be used for magnetic separation and easy extraction techniques. In the following step, magnetic PAN-co-AA nanofibers (MNFs) were used to determine MG in aquatic samples. The influence of different parameters on extraction was investigated and optimized to improve the extraction efficiency of MG. The calibration curve was linear in the range of 0.3–1.8 mg L−1 of MG with R2 = 0.9911. The detection limit, based on three times the standard deviation of the blank, was 0.03 mg L−1. The relative standard deviation (RSD) for 1, 1.5 and 1.8 mg L−1 of MG was 4.31%, 6.86% and 7.68% (n = 6), respectively. MG was analyzed in different water samples (urban, mineral and river waters) using the proposed method. The recoveries were 95.83–103.3% with an RSD of less than 8%. The results showed that MNFs were suitable for pre-concentration and determination of trace amount of MG in wastewater samples.
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Mahboobeh Najafi,Tahereh Rohani Bastami,Nafiseh Binesh,Ali Ayati,Simin Emamverdi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
As anionic alloy or layered compounds, layered double hydroxides (LDH) have recently attracted muchattention due to their excellent adsorption and catalytic properties. In this work, NiFe layered doublehydroxide (NiFeLDH) was utilized as a precursor to synthesize NiFeLDH/Au nanocomposites via a simpleurea-hydrolyzed hydrothermal process under UV–vis light irradiation. The as-prepared nanomaterialswere characterized using XRD, FT-IR, XPS, BET, UV–vis, TEM, and FESEM analysis. The performance ofNiFeLDH and NiFeLDH/Au nanocomposites was evaluated in the adsorptive removal of congo red (CR)dye from aqueous media using two methods of adsorption, i.e. liquid phase sorption (MS) and sonosorption(US). The sono-sorption technique exhibited higher removal efficiency due to the generationof small bubbles, strong shock waves, high-velocity microjets, and diminished thickness of diffusion layers. Furthermore, the NiFeLDH/Au nanocomposite offered much higher performance in CR removal,exhibiting a dye removal efficiency of 95% in 7 minutes of sono-sorption time. The superior performanceof the NiFeLDH/Au composite can be assigned to the high specific surface area of the sorbent, better dispersionof Au nanoparticles onto the surface of NiFeLDH materials, and synergistic effects between Auand NiFeLDH. Also, the isothermal evaluation showed that the data of CR adsorption onto fabricatednanohybrids could be well-matched with the Langmuir model indicating uniform surface energies. Moreover, kinetics studies revealed that the best data fitting for CR adsorption can be provided byHo’s pseudo-second-order kinetics. The thermodynamic study revealed that the adsorption of CR dyeonto NiFeLDH/Au was an endothermic and spontaneous process at the investigated temperatures andCR concentrations. Finally, this research suggests a simple method for the synthesis of an LDH-basednano-sorbent capable of almost completely removing organic dyes from aqueous media.
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Morteza Davarpanah,ALI AHMADPOUR,Tahereh Rohani-Bastami,Hossein Dabir 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
Polystyrene resin was functionalized by diethanolamine for the efficient removal of p-toluenesulfonicacid (p-TSA) from aqueous solution. Functionalized adsorbent (DEA-PS) was characterized by elementalanalysis, Fourier transform infrared spectroscopy, point of zero charge measurement and field-emissionscanning electron microscopy. According to the results, maximum removal of p-TSA was observed at thepH range of 2.5–5. The adsorption kinetics of p-TSA onto DEA-PS was represented by pseudo-first-ordermodel and the equilibrium data followed Langmuir model well. The adsorption process wasendothermic and spontaneous, along with the positive change of entropy. The regeneration of DEAPSwas also conducted by 1 M NaOH solution.
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Functionalized magnetite / silica nanocomposite for oily wastewater treatment
Hakimabadi, Seyfollah Gilak,Ahmadpour, Ali,Mosavian, Mohammad T. Hamed,Bastami, Tahereh Rohani Techno-Press 2015 Advances in environmental research Vol.4 No.2
A new magnetite-silica core/shell nanocomposite ($Fe_3O4@nSiO_2@mSiO_2$) was synthesized and functionalized with trimethylchlorosilane (TMCS). The prepared nanocomposite was used for the removal of diesel oil from aqueous media. The characterization of magnetite-silica nanocomposite was studied by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission electron microscopy (TEM), surface area measurement, and vibrating sample magnetization (VSM). Results have shown that the desired structure was obtained and surface modification was successfully carried out. FTIR analysis has confirmed the presence of TMCS on the surface of magnetite silica nanocomposites. The low- angle XRD pattern of nanocomposites indicated the mesoscopic structure of silica shell. Furthermore, TEM results have shown the core/shell structure with porous silica shell. Adsorption kinetic studies indicated that the nanocomposite was able to remove 80% of the oil contaminant during 2 h and fit well with the pseudo-second order model. Equilibrium studies at room temperature showed that the experimental data fitted well with Freundlich isotherm. The magnetic property of nanocomposite facilitated the separation of solid phase from aqueous solution.
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