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      저자 : A. Haghighi Asl (검색결과 2 건)
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        Identification and optimization of key parameters in preparation of thin film composite membrane for water desalination using multi-step statistical method

        H. Azizi Namaghi,A. Haghighi Asl,M. Pourafshari Chenar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-

        This study seeks to address the influence of critical variables including casting thickness, polysulfone(PSf) concentration, m-phenylenediamine soaking time, curing time, curing temperature and interfacialpolymerization (IP) time in the preparation of thin film composite (TFC) membrane. To properly track theeffects of each parameter as well as their interactions on the performance of manufactured membranes,totally 22 experiments were conducted and evaluated by fractional factorial design (FFD). The resultsshowed that due to the complexity of variables, the preliminary models based on the factorialexperiments were not able to explain the response curvature. Therefore, a response surface methodology(RSM) based on Box–Behnken design (BBD) was tested to provide a quadratic model, by which thepredicted responses were compared with the experimental ones. By the use of RSM, various contour andthree-dimensional (3D) plots were constructed to predict optimal levels of the variables. All consideredparameters have shown a significant effect on the performance of TFC membrane. The order ofsignificance for permeate flux and rejection rate was ‘‘curing temperature > polysulfone concentra-tion > interfacial polymerization’’ and ‘‘interfacial polymerization > curing temperature > polysulfoneconcentration’’, respectively. The predicted values were in reasonable agreement with the experimentaldata, confirming the high predictability of the applied model.

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        A novel selective H2S sensor using dodecylamine and ethylenediamine functionalized graphene oxide

        M. Malek Alaie,M. Jahangiri,A.M. Rashidi,A. Haghighi Asl,N. Izadi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-

        Dodecylamine (DDA) and ethylenediamine (EDA) functionalized graphene oxide (GO) nanosensorswere synthesized by amidation methods and characterized by X-ray photoelectron spectroscopy (XPS),Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The resultsshowed that compared to pristine GO-based sensor, the DDA-GO and EDA-GO chemiresistors have asignificant response to hydrogen sulfide (H2S) down to 50 ppm at room temperature. Furthermore,operating temperature effects, H2S concentration and GO suspension concentration on sensor responseare also investigated. Functionalized graphene oxide chemiresistors offer advantages such asremarkable potential for mass production due to their ease of manufacturing, significant selectivityand performance.

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