Glycidyl POSS-functionalized ZnO nanoparticles incorporated polyether-imide based nanofiltration membranes for heavy metal ions removal from water

Samaneh Bandehali,Abdolreza Moghadassi,Fahime Parvizian,Jiangnan Shen,Sayed Mohsen Hosseini 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2

Surface functionalization of zinc oxide (ZnO) nanoparticles was performed by glycidyl POSS. The synthesized nanoparticles were applied to prepare polyether-imide based-nanofiltration membranes by phase inversion method. The characterizations were done by FESEM, EDX and AFM analysis. The effect of different concentrations of POSS-ZnO (PZ) nanoparticles was investigated to evaluate the separation performance of prepared membranes by contact angle measurement, pure water flux (PWF), rejection of aqueous solutions including Na2SO4, Pb(NO3)2, Cu(NO3)2 and flux recovery ratio (FRR%). The prepared PEI/PZ membranes showed significant separation performance and antifouling properties compared with neat PEI and PEI/ZnO membranes. The highest pure water flux (42.4 L/m2h) was revealed for M1-PZ in 0.001 wt% of PZ nanoparticles, whereas that was 17 (L/m2h) for neat membrane and 12-18 (L/m2h) for PEI/ZnO, respectively. Also, salt rejection was low for blended PEI/ZnO membranes. By incorporation of PZ into the PEI, Na2SO4, and Pb (NO3)2 rejection improved to 83% and 59%, respectively. Moreover, the M3-PZ showed the best separation performance for Cu (NO3)2 with the rejection of 67%. The highest antifouling properties were obtained for M4-PZ with FRR% of 59%, which is significant compared with 15% for PEI/ZnO and 30% for neat PEI membranes.

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,Sayed Mohsen Hosseini 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.9

L-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/m2 h 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).

Tailoring the separation performance and antifouling property of polyethersulfone based NF membrane by incorporating hydrophilic CuO nanoparticles

Sayed Mohsen Hosseini,Fatemeh Karami,Samaneh Koudzari Farahani,Samaneh Bandehali,Jiangnan Shen,Ehsan Bagheripour,Amin Seidypoor 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.5

CuO/PES composite membranes were fabricated through phase inversion method, focusing on fouling reduction and improving separation performance. Copper oxide nanoparticles were used as filler additive in the membrane structure. The effect of the embedded CuO nanoparticles on the morphology was studied by considering SEM, SOM and 3D surface images. Flux recovery ratio (FRR%), water contact angle, water content, mechanical tensile strength, porosity and mean pore size, salt rejection and water flux were investigated to evaluate the performance of fabricated membranes. The SOM images showed a uniform surface for the modified membranes. SEM images showed a finger-like structure for the modified membranes. Results also denoted an increment in porosity and mean pore size of membrane at low concentration of CuO NPs, whereas the opposite trend was found at higher concentration of nanoparticles. Utilizing CuO NPs enhanced the membrane tensile strength obviously. PWF significantly was improved by applying CuO NPs in membrane matrix. Highest PWF (42.63 L/m2h) was observed for PES-0.05 wt% CuO blended membrane, whereas it was 10.41 (L/ m2h) for pristine ones. Salt rejection also measured 82% for virgin membrane and 63-90% for modified membranes. Moreover, FRR% were measured (~77% to ~93%), while the pristine membrane showed ~63% FRR%.

A planned review on designing of high-performance nanocomposite nanofiltration membranes for pollutants removal from water

Samaneh Bandehali,Fahime Parvizian,Huimin Ruan,Abdolreza Moghadassi,Jiangnan Shen,Alberto Figoli,Adeyemi S. Adeleye,Nidal Hilal,타케시마쯔라,Enrico Drioli,Sayed Mohsen Hosseini 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-

The shortage of clean water sources and increase of demand for fresh water have become as major globalchallenges not only in industries but also inhuman life. Meanwhile, membrane technology has beenextensively noticed due to high separation efficiency, energy-saving and environmentally-friendly characteristic. So, development of new membrane is a vital step in advancing of membrane application inwater-treatment. This paper presents a comprehensive review on development of high-performancenanofiltration membrane based on nanotechnology for wastewater treatment. Application of new nanomaterialshas enabled fabrication of NF-membranes with improved separation properties for pollutantsremoval from water. Recognizing that conventional membranes are not necessarily suitable for industrialapplications and/or process intensifications many attempts were made recently to use of nanomaterialsinto NF-membranes, aiming to overcome trade-off relationship between flux/selectivity and to improvetheir stability. So, development of new structured nanomaterial with desirable properties is one of mostcrucial research topics for membrane researchers. Accordingly, an overview on different methods todesign of advanced nanomaterial presented that allow us to overcome their inherent problems in membranesfabrication such as agglomeration, defects formation, insufficient pores’ tuning, poor active sitesand anti-fouling properties; however, selection of appropriate nanomaterials is a challenge of utmost difficulty. Various types of nanomaterials such as zeolites, carbon based, framework (MOF/ZIF/COF), nanobiopolymersand special nanoparticles such as SFNPs, SFNCs, POSS, ZCPs, and nickel hydroxide nanosheetare presented and their roles in NF-transport are discussed as well as strategies for surface modificationof nanoparticles to promoting their surface charges density. Moreover, fabrication methods of nanoenhanced NF-membranes including layer by layer assembly, hollow fiber spinning, electrospinning ofnanofibers, construction of thin-film nanocomposite besides blending, co-polymerization; cross-linkingand grafting techniques are discussed. A proper view for selection of appropriate nanoparticles in membranefabrication is offered while considering types of pollutants to be removed.

A Provably-Correct Micro-Dalvik Bytecode Verifier

Jiang Nan,He Yanxiang,Zhang Xiaotong,Liu Rui,Shen Yunfei 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.9

In this paper we propose and implement a provably-correct bytecode verifier for Micro-Dalvik which is a significant subset of Dalvik. We take the approach of a data flow analysis on semilattice to solve the bytecode verification. The operational semantics of Micro-Dalvik is developed. The semilattice structure is constructed and transfer functions are defined. Based on the semilattice and transfer functions the well-typing is described. The bytecode verifier is realized to compute a method type to see whether each instruction is assigned a well-typing. By giving conforming relations between the machine state and the well-typing, the correctness of the verifier is proved that the verifier guarantees safe execution and well-typed Micro-Dalvik programs do not produce type errors.