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RISS 인기검색어
- 검색키워드
- 저자 : Ehsan Saljoughi (검색결과 3 건)
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Bahareh Rastegar,Ehsan Saljoughi,Seyed Mahmoud Mousavi,Shirin Kiani 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
Hydrophilic membranes composed of polyphenylsulfone (PPSU)/polyethylene glycol hexadecyl ether (Brij-58), with noticeable properties and performance in the filtration of dye solution, were prepared for the first time. Scanningelectron microscopy (SEM) images were utilized to examine the morphology of the obtained membranes. Attenuatedtotal reflection Fourier-transform infrared (ATR-FTIR) spectra, water contact angle, water uptake capacity, andtensile properties of the membranes confirmed that Brij-58 remained in the structure of the obtained membranes dueto the high molecular weight of the additive. Higher water contact angle and water uptake capacity obtained withincreasing the Brij-58 concentration showed enhanced membrane hydrophilicity. The addition of Brij-58 and increasingits concentration was followed by a constant increase in pure water flux (PWF) and antifouling property of themembrane. According to the results, the incorporation of 10 wt% Brij-58 into the polymeric solution contributed toalmost 54-fold higher water flux and approximately 36% higher flux recovery ratio (FRR), while the rejection ofdisperse blue was only slightly reduced.
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Seyed Mahmoud Mousavi,Mohammad Ali Haj Asgarkhani,Ehsan Saljoughi 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
Cellulose acetate butyrate/TiO2 hybrid membranes were prepared via phase inversion by dispersing the TiO2 nanoparticles in casting solutions. The influence of TiO2 nanoparticles on the morphology and performance of membranes was investigated. The scanning electron microscope images and experiments of membrane performance showed that the membrane thickness and pure water flux were first increased by adding the TiO2 nanoparticles to the casting solution up to 4 wt% and then decreased with the addition of further nanoparticles to it. The obtained results indicated that the addition of TiO2 in the casting solution enhanced the rejection and permeate flux in filtration of bovine serum albumin solution. Furthermore, increasing the TiO2 nanoparticle concentration in the casting solution increased the flux recovery and consequently decreased the fouling of membrane.
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Use of membrane separation in enzymatic hydrolysis of waste paper
Narges Milani Rad,Seyed Mahmoud Mousavi,Masoumeh Bahreini,Ehsan Saljoughi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
A three-stage process containing phosphoric acid pretreatment, enzymatic hydrolysis, and membrane filtration was performed on waste paper as a lignocellulosic material. In the first two stages, the effect of phosphoric acid concentration, enzyme loading, hydrolysis time, and substrate concentration on the amount of products was investigated. At the third stage using a proper membrane, the effect of substrate concentration and transmembrane pressure (TMP) on yield of the reducing sugars was studied. The novelty of the present study was to demonstrate the application of ultrafiltration membrane on the enzymatic hydrolysis process of waste paper. The reducing sugars concentration was determined by using the 3,5-dinitrosalicylic acid (DNS) reagent method. According to the results, a value of 0.5% was determined as the optimum concentration for phosphoric acid in the pretreatment stage. The reducing sugars yield was obtained as 67.4% in this concentration. Moreover, for the enzymatic hydrolysis of waste paper, the suitable amounts of cellulase enzyme loading and hydrolysis time were determined as 50 mg/g substrate and 48 h, respectively. In the filtration stage, increase of substrate concentration and decrease of TMP resulted in higher rejection of the reducing sugars. The experimental results revealed that the highest rejection was 19.2% at TMP of 3 bar and substrate concentration of 100 g/L.
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