MCM-48改性三醋酸纤维素正渗透膜的制备及性能表征
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摘要
采用模板剂法合成了具有三维孔道结构的MCM-48二氧化硅纳米球形颗粒。将MCM-48分散到含三醋酸纤维素(CTA)的铸膜液中,通过相转化法制备了MCM-48\CTA正渗透复合膜。复合膜的表征数据表明,MCM-48成功的掺杂到CTA膜中,而且随着MCM-48含量的增加,膜的亲水性增强,孔隙率增大。正渗透实验结果表明,以纯水为原料液,1 mol/L NaCl为汲取液时,与纯CTA膜相比,MCM-48\CTA膜水通量增加一倍,达到了14.2 L/(m~2·h),反向盐通量为0.15 mol/(m~2·h)。表明,MCM-48纳米颗粒可以有效的优化CTA正渗透膜的分离性能。
MCM-48 silica spherical nanoparticles with a three-dimensional pore structure were synthesized by the template agent. The cellulose triacetate(CTA)-based forward osmosis(FO) composite membranes modified with MCM-48(MCM-48/CTA) were prepared via phase inversion method with dispersing MCM-48 in the casting solution containing CTA. The results exhibited that MCM-48 doped into the CTA membrane successfully. The hydrophilicity and porosity of the MCM-48/CTA composite membranes were improved with the increase of the MCM-48 content. The water flux of MCM-48/CTA membrane(containing 0.15wt% MCM-48) reached to 14.2 L/(m~2·h) when the feed and draw solutions were pure water and 1 mol/L NaCl solution respectively. This results is over 2 times higher than water flux of neat CTA FO membrane. The performance results indicated that MCM-48 nanoparticles could effectively optimize separation performance of CTA forward osmosis membrane.
MCM-48 silica spherical nanoparticles with a three-dimensional pore structure were synthesized by the template agent. The cellulose triacetate(CTA)-based forward osmosis(FO) composite membranes modified with MCM-48(MCM-48/CTA) were prepared via phase inversion method with dispersing MCM-48 in the casting solution containing CTA. The results exhibited that MCM-48 doped into the CTA membrane successfully. The hydrophilicity and porosity of the MCM-48/CTA composite membranes were improved with the increase of the MCM-48 content. The water flux of MCM-48/CTA membrane(containing 0.15wt% MCM-48) reached to 14.2 L/(m~2·h) when the feed and draw solutions were pure water and 1 mol/L NaCl solution respectively. This results is over 2 times higher than water flux of neat CTA FO membrane. The performance results indicated that MCM-48 nanoparticles could effectively optimize separation performance of CTA forward osmosis membrane.
引文
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[4]WANG K Y,TAI-SHUNG C,GARY A.Developing thin-filmcomposite forward osmosis Membranes on the Pes/Spsf substrate through interfacial polymerization[J].Aiche Journal,2012,58(58):770-781.
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[7]SHUREN C,SHI L,WANG R,et al.Characteristics and potential applications of a novel forward osmosis hollow fiber membrane[J].Desalination,2010,261(3):365-372.
[8]HAN G,CHUNG T S,TORIIDA M,et al.Thin-film composite forward osmosis membranes with novel hydrophilic supports for desalination[J].Journal of Membrane Science,2012,s423-424(51):543-555.
[9]解利昕,辛婧,解奥.三乙酸纤维素正渗透膜的制备与性能[J].化工进展,2014(10):2700-2706.
[10]ZIREHPOUR A,RAHIMPOUR A,SEYEDPOUR F,et al.Developing new CTA/CA-based membrane containing hydrophilic nanoparticles to enhance the forward osmosis desalination[J].Desalination,2015,371:46-57.
[11]DABAGHIAN Z,RAHIMPOUR A,JAHANSHAHI M.Highly porous cellulosic nanocomposite membranes with enhanced performance for forward osmosis desalination[J].Desalination,2016,381:117-125.
[12]AHMAD A L,Al E.Preparation and characterization of CTA/mZn O composite membrane for transport of Rhodamine B[J].Desalination&Water Treatment,2014.
[13]KRESGE C T,LEONOWICZ M E,ROTH W J,et al.Ordered mesoporous molecular sieves synthesized by liquid-crystal template mechanism[J].Nature,1992,359(6397):710-712.
[14]AND P I R,NEIMARK A V.Relations between structural parameters and adsorption characterization of templated nanoporous materials with cubic symmetry[J].Langmuir,2000,16(16):2419-2423.
[15]KIM T W,CHUNG P W,LIN S Y.Facile synthesis of monodisperse spherical MCM-48 mesoporous silica nanoparticles with controlled particle size[J].Chemistry of Materials,2010,22(17):5093-5104.
[16]WANG R,SHI L,TANG C Y,et al.Characterization of novel forward osmosis hollow fiber membranes[J].Journal of Membrane Science,2010,355(1-2):158-167.
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[18]WITTE P V D,DIJKSTRA P J,BERG J W A V D,et al.Phase separation processes in polymer solutions in relation to membrane formation[J].Journal of Membrane Science,1996,117(1-2):1-31.
[19]MCCUTCHEON J R,ELIMELECH M.Influence of membrane support layer hydrophobicity on water flux in osmotically driven membrane processes[J].Journal of Membrane Science,2008,318(1):458-466.
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