Improvement in separation performance of PEI-based nanofiltration membranes by using L-cysteine functionalized POSS-TiO
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Improvement in separation performance of PEI-based nanofiltration membranes by using L-cysteine functionalized POSS-TiO2 composite nanoparticles for removal of heavy metal ion Samaneh Bandehali*, Fahime Parvizian*, Abdolreza Moghadassi*,†, Jiangnan Shen**, and Sayed Mohsen Hosseini*,† *Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran **Center for Membrane Separation and Water Science & Technology, Ocean College, Zhejiang University of Technology, Hangzhou 310014, China (Received 25 November 2019 • Revised 5 March 2020 • Accepted 8 March 2020) AbstractL-cysteine as an amino acid was used for the modification of glycidyl POSS in the synthesis of L-cysteine functionalized POSS, including carboxyl, hydroxyl, and diamine groups. Then, the synthesized nanoparticles were applied to fabrication of L-cysteine POSS-TiO2 composite nanoparticles. NF membranes were prepared from the incorporation of different concentrations of the synthesized composite nanoparticles into the polyether-imide (PEI) as the membrane matrix. The prepared membranes were characterized by Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM) and atomic force microscope (AFM). Moreover, the separation performance of the NF membranes was examined by pure water flux (PWF) and the separation of Na2SO4, Pb(NO3)2, Cr(NO3)2 and Cu(NO3)2 aqueous solutions. The results showed the increase of pure water flux due to present hydrophilic groups on the membrane surface. The highest pure water flux obtained was 22.03 L/m2h in 1 wt% of nanoparticles. Furthermore, the rejection of Na2SO4 and Pb(NO3)2, CrSO4, and Cu(NO3)2 improved to 78%, 64%, 67% and 66% that increased 11%, 33%, and 22%, and 39% compared with the pristine PEI membrane, respectively. Finally, the best FRR% (81%) was obtained for 0.1 wt% of the composite nanoparticles (M3). Keywords: Polyether-imide, Nanofiltration, L-cysteine/POSS-TiO2, Composite Nanoparticles, Heavy Metal Ions
In this study, a novel composite nanomaterial was synthesized by combination of TiO2 and polyhedral oligomeric silsesquioxane (POSS) nanoparticles. The TiO2 nanoparticles have high stability, non-toxicity, photo-catalytic, and good hydrophilic properties [1315]. Moreover, POSS nanoparticles have a unique structure with high flexibility which makes possible its functionalization easily. This provides better affinity for them with membrane matrix [1618]. There are many studies for the application of POSS in membranes gas separation and pervaporation [19-22]. Moreover, some studies focused on the metal ion removal from aqueous solutions by POSS nanomaterials due to cage structure and its high capacity for heavy metal adsorption [23,24]. Also, several studies considered POSS nanomaterials in membranes for wastewater treatment that reported improvement of separation properties and their yield such as overcoming to the membrane clogging, as well as their accum
