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RISS 인기검색어
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- 저자 : Zaib Jahan (검색결과 3 건)
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Mechanical, thermal and swelling properties of cellulose nanocrystals/PVA nanocomposites membranes
Zaib Jahan,Muhammad Bilal Khan Niazi,Øyvind Weiby Gregersen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Cellulose nanocrystals (CNC) have strong reinforcing properties when incorporated in a compatiblepolymer matrix. The study was conducted to investigate the effect of addition of different proportions ofCNC on the mechanical, thermal and swelling properties of poly(vinyl alcohol) (PVA) nanocompositemembranes for biogas separation. The incorporation of CNC in PVA increased the crystallinity at allinvestigated relative humidities. No apparent trend is observed for mechanical properties for drymembranes (0% RH) with addition of CNC in PVA matrix. However, at 93% RH the elastic modulusincreased 25 times with addition of CNC compared to pure PVA membranes. Moreover, tensile strengthalso showed twice the values at 53% RH and 93% RH after the addition of CNC. Membranes containinghigher CNC content absorbed 9% less moisture. Swelling, thermal and mechanical properties indicate agood potential of CNC/PVA nanocomposite membranes for use in CO2 separation membranes.
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Mechanical and thermal properties of carboxymethyl fibers (CMF)/PVA based nanocomposite membranes
Muhammad Bilal Khan Niazi,Zaib Jahan,Arooj Ahmed,Bushra Uzair,Ahmad Mukhtar,Øyvind Weiby Gregersen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Carboxymethylfibers (CMF) of cellulose are renewable biopolymer and have shown strong reinforcingproperties when added to a compatible polymer matrix. The objective of this study was to investigate theeffect of CMF on the mechanical, thermal and swelling properties of polyvinyl alcohol (PVA) membranes. The PVA/CMF composite membranes with different proportions of CMF ranging from 1 wt.% to 6 wt.%were prepared by solution casting method. The membranes were characterized by SEM, TGA, XRD, FTIRand mechanical testing. The results revealed that at low CMF concentration composite membranesshowed homogenous dispersion of CMF in PVA matrix. The incorporation of CMF enhanced thecrystallinity of composite membranes with increase in relative humidity (RH). Furthermore, themechanical strength and moisture uptake of PVA/CMF nanocomposite membranes were enhanced afterinclusion of CMF. TGA and DSC results revealed that the addition of CMF has no significant impact on thethermal properties. PVA/CMF nanocomposite membranes showed good potential to be applied for gasseparation application particularly for CO2 capture.
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Aizaz Ali Farman,Muhammad Irfan,Noor Ul Amin,Zaib Jahan,Xiangju Song,Heqing Jiang,Saeed Gul 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.11
The selection of an appropriate draw solution is decisive to augment the performance of the forward osmosis (FO) process with maximal permeate flux and minimal reverse solute flux. Inorganic salts provide higher permeate flux in FO, but high reverse salt flux (RSF) associated with greater diffusivity limits their potential application. Herein, the incorporation of organic compounds including sodium acetate (NaAce) and glucose in CaCl2 provides draw solutions with constant osmotic pressure for boosting FO performance. The PRO mode (active layer facing draw solution) is examined with 0.18m/s of cross-flow velocity using a polyamide membrane associated with a polyethyleneimine (PEI) interlayer on a NaOH treated polyacrylonitrile substrate. The 5% NaAce with CaCl2 as a draw solution (DS) delivers better performance against deionized water compared to glucose, resulting in lower RSF (6.64 g/m2 h) and higher water flux (23.9 L/m2 h). The NaAce with CaCl2 suppresses RSF up to 41% without a significant reduction in permeate flux compared to single salt DS. The optimized draw solution concentrates the orange juice, resulting in 2.13 L/m2 h of average water flux and 3.6 g/m2 h of RSF for 72 h, thus concentrating the orange juice from the initial concentration of 13 oBrix to 24 oBrix.
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