A hydrophilic-oleophobic chitosan/SiO2 composite membrane to enhance oil fouling resistance in membrane distillation

Majid Peyravi,Fatemeh Ardeshiri,Ahmad Akbari,Mohsen Jahanshahi 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.2

To develop an inexpensive and simple technology and increase anti-oil fouling resistance for membrane distillation applications, a hydrophilic/oleophobic nanocomposite membrane was fabricated by using SiO2/Chitosan (CT) sol solution coating with different volume ratios (0.5 : 1, 1 : 1 and 2 : 1 v/v) on PVDF membrane surface. The formation of SiO2/CT layer on membrane surface was confirmed by Fourier transform infrared (FTIR) spectroscopy and energy-dispersive X-ray spectroscopy (EDX). The influence of hydrophilic nanocomposite layer on the characteristics of membranes, including in-air water contact angle, morphology, porosity, liquid entry pressure of water (LEPw) and direct contact membrane distillation (DCMD) performance, was investigated. The results show that the composite membrane (SiO2/CT (1 : 1 v/v)- PVDF membrane) by adding of 0.5 and 1 g/L gasoline concentrations not only incurred fouling but also a higher flux with respect to the neat membrane in each gasoline concentration. During 8 hours continuous desalination process of saline gasoline emulsion solution (20 gr/L NaCl solution containing 0.5 gr/L gasoline), it was found that all modified membranes had high performance stability in comparison with the neat membrane, the modified membrane showed high performance stability and flux without decreased salt rejection (99.9%). At the end, we conducted performance comparison between the prepared membranes in current work and presser based process.

Self-cleaning behavior of nanocomposite membrane induced by photocatalytic WO3 nanoparticles for landfill leachate treatment

Majid Peyravi,Nader Shafaei,Mohsen Jahanshahi,Qasem Najafpour 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10

Photocatalytic self-cleaning polysulfone (PSf) membranes were fabricated by adding different concentrations of WO3 nanoparticles (0-2 wt%) via phase inversion method for ultrafiltration of landfill leachate. To evaluate the feasibility of self-cleaning property by WO3 nanoparticles, all synthesized membranes were tested with and without UV. After UV irradiation, the value of the contact angle for a membrane with 2wt% WO3 decreased from 67.15o to 37.9o. Results showed that the addition of WO3 affected the pore size, porosity and hydrophilicity of the WO3/PSf membrane, so that the porosity of membrane with 2 wt% WO3 reached 84.86%. The flux of the nanocomposite membrane after irradiation by UV light rose in comparison with the same membrane without UV light, and the flux decline rates also decreased. The flux of the membrane with 2wt% WO3 was also better than the other membranes, which shows the self-cleaning property. The chemical oxygen demand (COD) removal of leachate for modified membranes was also improved by increasing the WO3 nanoparticles. The highest COD removal of the modified membrane with 2 wt% WO3 was 54.91%. This value increased to 77.45% after UV radiation.

Decreasing ICP of forward osmosis (TFN-FO) membrane through modifying PES-Fe3O4 nanocomposite substrate

Rezvaneh Ramezani Darabi,Majid Peyravi,Mohsen Jahanshahi,Ali Asghar Qhoreyshi Amiri 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8

This film nanocomposite forward osmosis (TFN-FO) membrane was developed using polyethersulfone-ferrous ferric oxide (PES-Fe3O4) nanocomposite substrate. The results revealed that the porosity and the hydrophilicity of the PES substrate were improved after addition of Fe3O4 nanoparticles (NPs), leading to reducing in structural parameter (S value or S) and water flux enhancement. To fabricate TFN membranes for FO application, a thin polyamide layer was fabricated by interfacial polymerization of m-Phenylenediamine (MPD) and 1, 3, 5-trimesoylchloride (TMC) on the top surface of PES-Fe3O4 nanocomposite substrates. The TFN membrane prepared with 0.2 wt% Fe3O4 NPs showing the most reliable results by exhibiting high water flux and low reverse solute flux. Furthermore, TFN0.2 membrane exhibited significantly higher pure water flux than that of control thin film composite (TFC) membrane in both AL-FS and AL-DS orientation when 10 mM NaCl and Caspian seawater was used as feed solution and 0.5 or 2M NaCl was used as draw solution. This improvement can be attributed to the fact that the S value of TFN0.2 is much lower in comparison to control TFC membrane (0.42 vs 0.78 mm), leading to reduced internal concentration polarization (ICP) effect.

Antibacterial dynamic membranes loaded by cephalexin/amine-functionalized SBA_15 for Pb(II) ions removal

Maryam Darzipour,Mohsen Jahanshahi,Majid Peyravi,Soodabeh Khalili 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12

Novel antibacterial dynamic membranes loaded by cephalexin/amine functionalized SBA_15 were fabricated for heavy metal removal from aqueous solution. The mesoporous CPX/NH2-SBA_15 nanocomposite was formed as a uniform adsorptive and hydrophilic layer on the ultrafiltration polymeric membrane (PVDF). The modified adsorbent and membranes were characterized by SEM, XRD, N2 adsorption-desorption analysis, FT-IR, TGA, DSC and contact angle. A number of qualitative (well diffusion, disk diffusion) antibacterial assays were conducted against grampositive S. aureus and gram-negative E. coli. In addition, to evaluate its anti-biofouling performance, the model concentrated bacteria suspension in liquid medium was used as a feed solution. 100% bacteria mortality for certain concentration and suitable inhibition zones up to 3.5cm were attained. An increment in the flux recovery from 55% (for UF) to 87% (for self-forming dynamic membrane (DM)) and 91% (for pre-coated DM) indicated that the dynamic layer improved the anti-biofouling property of the support membrane. High Pb(II) removal efficiency (99.8%) was achieved for the modified membrane during dynamic filtration test. CPX/NH2/SBA-15 dynamic membrane showed higher Pb2+ rejection than SBA-15 dynamic membrane because of amine groups located on the adsorbent surface. In general, membranes provide good performance like better flux and rejection besides antibacterial and anti-biofouling behavior.

Sublayer assisted by hydrophilic and hydrophobic ZnO nanoparticles toward engineered osmosis process

Sina Mansouri,Soodabeh Khalili,Majid Peyravi,Mohsen Jahanshahi,Rezvaneh Ramezani Darabi,Fatemeh Ardeshiri,Ali Shokuhi Rad 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.11

Hydrophilic and hydrophobic polyethersulfone (PES)-zinc oxide (ZnO) sublayers were prepared by loading of ZnO nanoparticles into PES matrix. Both porosity and hydrophilicity of the hydrophilic sublayer were increased upon addition of hydrophilic ZnO, while these were decreased for the hydrophobic sublayer. In addition, the results demonstrated that the hydrophilic membrane exhibited smaller structural parameter (S value or S parameter or S), which is beneficial for improving pure water permeability and decreasing mass transfer resistance. In contrast, a higher S parameter was obtained for the hydrophobic membrane. With a 2M NaCl as DS and DI water as FS, the pure water flux of hydrophilic TFN0.5 membrane was increased from 21.02L/m2 h to 30.06L/m2 h and decreased for hydrophobic TFN0.5 membrane to 14.98L/m2 h, while the salt flux of hydrophilic membrane increased from 10.12g/m2 h to 17.31g/m2 h and decreased for hydrophobic TFN0.5 membrane to 3.12g/m2 h. The increment in pure water permeability can be ascribed to reduction in S parameter, which resulted in reduced internal concentration polarization (ICP). The current study provides a feasible and low cost procedure to decrease the ICP in FO processes.

Feasibility of hydrophobized PES membrane in hybrid MD/FO process using magnetic draw solution

Setareh Salehi,Mohsen Jahanshahi,Majid Peyravi 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.6

The feasibility of PES membrane with hydrophobic property, high glass transition temperature, excellentthermal and chemical stability, with good mechanical properties as porous polymeric support was studied in membranedistillation (MD) process. Several strategies were considered and investigated to decrease membrane wetting bykeeping up salt rejection and also to improve the permeate flux of PES membrane in the MD process. From this pointof view, hydrophobic PMHS polymer with different concentrations was used as a surface coating solution. The morphologyand structure of prepared membranes were evaluated by AFM and FESEM analyses. After coating modification,the salt rejection was increased up to 98% and the contact angle was changed from 65.11o to >100.2o. To increasethe water flux, the effect of feed temperature (55 oC and 75 oC) and draw solution utilization containing magneticnanoparticle (Fe3O4) was investigated. Using draw solution provided a driving force from feed solution to permeateside and increased average permeate flux from 2.9 kg/m2·h to 6.9 kg/m2·h in the 0.06 g/l of draw solute concentration. It improved permeate flux and salt rejection simultaneously.

Feasibility study of a novel copolyamide thin film composite membrane assisted by melamine in terms of acid and thermal stability

Hamzeh Hoseinpour,Mohsen Jahanshahi,Majid Peyravi,Ahmad Nozad 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-

A new acid stable copolyamide [PEI-Mel]-PA membrane was developed via interfacial polymerizationassisted by melamine. The physico-chemical properties and separation ability were studied. It wascompared with an acid stable polysulfonamide membrane in terms of acid stability. Melamine improvedthe thermal and acid stability and made the surface of the membrane more positively charged. Thedecreases in MgSO4 rejections were 56% and 31% for [PEI-Mel]-PA membrane after H2SO4 and HNO3treatment, respectively. The stability of [PEI-Mel]-PA improved up to 16% and 48% in H2SO4 and HNO3,respectively in comparison with PEI-PA membrane. It recovered more than 97% of the acid.

PDADMAC/PAA semi-IPN hydrogel-coated PVDF membrane for robust anti-wetting in membrane distillation

Fatemeh Ardeshiri,Ahmad Akbari,Majid Peyravi,Mohsen Jahanshahi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.74 No.-

In this study, composite membranes have been developed via deposition of poly(diallyldimethylammo-nium chloride)/poly acrylic acid (PDADMAC/PAA) semi-interpenetrating (semi-IPN) hydrogel on thepolyvinylidenefluoride (PVDF) support to provide an understanding the impacts of membrane surfacesand surfactants properties on wetting behavior in direct contact membrane distillation (DCMD)processes. The PDADMAC/PAA semi-IPN hydrogel membrane showed a wettability and underwateroleophobic properties with underwater oil contact angle over 125 , which favored reduction of oildeposition on the membrane surface. The long-term robustness of the PDADMAC/PAA-coated membranein 3 wt.% NaCl solution containing cationic, ionic and non-ionic surfactants was investigated via DCMDexperiments.

Forward osmosis process membranes incorporated with functionalized P.ZnO nanoparticles for organic fouling control

Rezvaneh Ramezani Darabi,Majid Peyravi,Mohsen Jahanshahi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4

The incorporation of functional nanoparticles in polyamide (PA) membranes is an efficient procedure for the thin film nanocomposite (TFN) membranes development with enhanced desalination efficiency. Our aim was to synthesize forward osmosis process (FOP) membranes incorporated with PIP-functionalized ZnO (P.ZnO) nanoparticles, which were produced with surface functionalities groups of amine, epoxy and hydroxyl. The outcomes of FTIR confirmed the synthesis of P.ZnO nanoparticles, while WCA, AFM and FESEM supported the alterations in chemical and physical attributes of the FOP membranes surface upon P.ZnO nanoparticles incorporation. In both reverse osmosis process (ROP) and FOP tests, outcomes illustrated that the TFN-P.ZnO0.03 membrane was the most promising FOP and ROP membrane as it exhibited 119% higher pure water flux (PWF) (in FOP test) than the base FOP membrane. In terms of FOP membrane fouling propensity, the TFN-P.ZnO0.03 membrane also illustrated lower fouling propensity compared to the base membrane. Our outcomes have provided novel intuition into the structure-efficiency correlation of TFN FOP membranes and can be advantageous for the synthesis of the wide confinement of nanoparticles incorporated FOP membranes.

Beryllium oxide (BeO) nanotube provides excellent surface towards adenine adsorption: A dispersion-corrected DFT study in gas and water phases

Mitra Sherafati,Ali Shokuhi Rad,Mehdi Ardjmand,Amir Heydarinasab,Majid Peyravi,Mahmoud Mirzaei 한국물리학회 2018 Current Applied Physics Vol.18 No.9

Zigzag (5, 0) BeO nanotube (BeONT) has been examined in detail towards adsorption properties of adenine nucleobase on its surface via D2-DFT calculation method in the gas and water phases. A detailed surface study reveals that there are four orientations for nucleobase adsorption that none of the vibrational spectrums demonstrated imaginary frequency, recognizing that all of the relaxed structures are at the minimum of energy. The minimum and maximum adsorption energies are both in chemisorption regime with calculated values of −140 (−118 BSSE corrected) and −191 (−168 BSSE corrected) in the gas phase, and −181 and −310 kJ/mol in the water phase, using meta-hybrid functional (□B97XD) and 6-31G** basis set. For all positions, BeONT showed p-type semiconducting property because of receiving electronic charge from adenine molecule. Our findings suggest that BeONT could be used as a possible strong carrier for adenine molecule in practical applications.