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Rezvaneh Ramezani Darabi,Majid Peyravi,Mohsen Jahanshahi,Ali Asghar Qhoreyshi Amiri 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
This film nanocomposite forward osmosis (TFN-FO) membrane was developed using polyethersulfone-ferrous ferric oxide (PES-Fe3O4) nanocomposite substrate. The results revealed that the porosity and the hydrophilicity of the PES substrate were improved after addition of Fe3O4 nanoparticles (NPs), leading to reducing in structural parameter (S value or S) and water flux enhancement. To fabricate TFN membranes for FO application, a thin polyamide layer was fabricated by interfacial polymerization of m-Phenylenediamine (MPD) and 1, 3, 5-trimesoylchloride (TMC) on the top surface of PES-Fe3O4 nanocomposite substrates. The TFN membrane prepared with 0.2 wt% Fe3O4 NPs showing the most reliable results by exhibiting high water flux and low reverse solute flux. Furthermore, TFN0.2 membrane exhibited significantly higher pure water flux than that of control thin film composite (TFC) membrane in both AL-FS and AL-DS orientation when 10 mM NaCl and Caspian seawater was used as feed solution and 0.5 or 2M NaCl was used as draw solution. This improvement can be attributed to the fact that the S value of TFN0.2 is much lower in comparison to control TFC membrane (0.42 vs 0.78 mm), leading to reduced internal concentration polarization (ICP) effect.
Rezvaneh Ramezani Darabi,Majid Peyravi,Mohsen Jahanshahi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
The incorporation of functional nanoparticles in polyamide (PA) membranes is an efficient procedure for the thin film nanocomposite (TFN) membranes development with enhanced desalination efficiency. Our aim was to synthesize forward osmosis process (FOP) membranes incorporated with PIP-functionalized ZnO (P.ZnO) nanoparticles, which were produced with surface functionalities groups of amine, epoxy and hydroxyl. The outcomes of FTIR confirmed the synthesis of P.ZnO nanoparticles, while WCA, AFM and FESEM supported the alterations in chemical and physical attributes of the FOP membranes surface upon P.ZnO nanoparticles incorporation. In both reverse osmosis process (ROP) and FOP tests, outcomes illustrated that the TFN-P.ZnO0.03 membrane was the most promising FOP and ROP membrane as it exhibited 119% higher pure water flux (PWF) (in FOP test) than the base FOP membrane. In terms of FOP membrane fouling propensity, the TFN-P.ZnO0.03 membrane also illustrated lower fouling propensity compared to the base membrane. Our outcomes have provided novel intuition into the structure-efficiency correlation of TFN FOP membranes and can be advantageous for the synthesis of the wide confinement of nanoparticles incorporated FOP membranes.
Sublayer assisted by hydrophilic and hydrophobic ZnO nanoparticles toward engineered osmosis process
Sina Mansouri,Soodabeh Khalili,Majid Peyravi,Mohsen Jahanshahi,Rezvaneh Ramezani Darabi,Fatemeh Ardeshiri,Ali Shokuhi Rad 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.11
Hydrophilic and hydrophobic polyethersulfone (PES)-zinc oxide (ZnO) sublayers were prepared by loading of ZnO nanoparticles into PES matrix. Both porosity and hydrophilicity of the hydrophilic sublayer were increased upon addition of hydrophilic ZnO, while these were decreased for the hydrophobic sublayer. In addition, the results demonstrated that the hydrophilic membrane exhibited smaller structural parameter (S value or S parameter or S), which is beneficial for improving pure water permeability and decreasing mass transfer resistance. In contrast, a higher S parameter was obtained for the hydrophobic membrane. With a 2M NaCl as DS and DI water as FS, the pure water flux of hydrophilic TFN0.5 membrane was increased from 21.02L/m2 h to 30.06L/m2 h and decreased for hydrophobic TFN0.5 membrane to 14.98L/m2 h, while the salt flux of hydrophilic membrane increased from 10.12g/m2 h to 17.31g/m2 h and decreased for hydrophobic TFN0.5 membrane to 3.12g/m2 h. The increment in pure water permeability can be ascribed to reduction in S parameter, which resulted in reduced internal concentration polarization (ICP). The current study provides a feasible and low cost procedure to decrease the ICP in FO processes.
Steel Frame Optimal Design Using MHBMO Algorithm
Seied Hosein Afzali,Abbas Darabi,Majid Niazkar 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2
Various deterministic and stochastic algorithms have been used as optimization tools in different engineering problems over the last decade. In this regard, the Modified Honey Bee Mating Optimization (MHBMO) algorithm may be considered as a typical swarm-based approach for optimizing numerous problems in engineering fields. In this paper, a design procedure based on the MHBMO technique was developed for discrete optimization of frames consisting W-shapes. The objective function in this research is to obtain the minimum weight of frames subjected to both strength and displacement requirements imposed by the American Institute for Steel Construction (AISC) and Load Resistance Factor Design (LRFD). Several frame examples from the literature were examined to verify not only the suitability of the design procedure but also the robustness of the MHBMO algorithm for frame structure design. The optimum results obtained by the MHBMO algorithm performs the best in comparison with other available techniques in the literature for all three steel frames. In conclusion, the results shows that the MHBMO algorithm is a powerful and applicable optimization method for design of frames consisting W-shapes.