Application of ZIF-67 as a crosslinker to prepare sulfonated polysulfone mixed-matrix membranes for enhanced water permeability and separation properties

Abstract High-performance sulfonated polysulfone (SPSf) mixed-matrix membranes (MMMs) were fabricated via a nonsolvent-induced phase separation (NIPS) method using ZIF-67 (Zeolitic imidazolate frameworks-67) as a crosslinker. Acid-base crosslinking occurred between the sulfonic acid groups of SPSf and the tertiary amine groups of the embedded ZIF-67, which improved the dispersion of ZIF-67 and simultaneously improved the membrane structure and permselectivity. The dispersion of ZIF-67 in the MMMs and the acid-base crosslinking reaction were verified by energy-dispersive X-ray spectroscopy (EDX), X-ray diffractometry (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The pore structure analysis of MMMs indicated that filling ZIF-67 into SPSf enhanced the average surface pore sizes, surface porosities and more micropore in cross-sections. The crossflow filtrations showed the MMMs have higher pure water fluxes (57 to 111 L m−2 h−1) than the SPSf membrane (55 L m−2 h−1) but also higher BSA(bovine serum albumin) rejection rate of 93.9–95.8%, a model protein foulant. The MMMs showed a higher water contact angle than the SPSf membrane due to the addition of hydrophobic ZIF-67 and acid-base crosslinking, and also maintained high thermal stability evidenced by the TGA(Thermogravimetric analysis) results. At the optimal ZIF-67 concentration of 0.3 wt%, the water flux of the SPSf-Z67-0.3 membrane was 82 L m−2 h−1 with a high BSA rejection rate of 95.3% at 0.1 MPa and better antifouling performance (FRR = 70%).

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Mixed-matrix membranes with enhanced antifouling activity: probing the surface-tailoring potential of Tiron and chromotropic acid for nano-TiO 2

Royal Society Open Science ◽

10.1098/rsos.170368 ◽

2017 ◽

Vol 4 (9) ◽

pp. 170368 ◽

Cited By ~ 4

Author(s):

Avishek Pal ◽

T. K. Dey ◽

A. K. Debnath ◽

Bharat Bhushan ◽

A. K. Sahu ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Structural Features ◽

Chromotropic Acid ◽

Mixed Matrix Membranes ◽

Transmembrane Pressure ◽

X Ray Diffraction ◽

Mixed Matrix ◽

Antifouling Activity ◽

X Ray ◽

Matrix Membranes

Mixed-matrix membranes (MMMs) were developed by impregnating organofunctionalized nanoadditives within fouling-susceptible polysulfone matrix following the non-solvent induced phase separation (NIPS) method. The facile functionalization of nanoparticles of anatase TiO 2 (nano-TiO 2 ) by using two different organoligands, viz . Tiron and chromotropic acid, was carried out to obtain organofunctionalized nanoadditives, F T -nano-TiO 2 and F C -nano-TiO 2 , respectively. The structural features of nanoadditives were evaluated by X-ray diffraction, X-ray photoelectron spectroscopy, Raman and Fourier transform infrared spectroscopy, which established that Tiron leads to the blending of chelating and bridging bidentate geometries for F T -nano-TiO 2 , whereas chromotropic acid produces bridging bidentate as well as monodentate geometries for F C -nano-TiO 2 . The surface chemistry of the studied membranes, polysulfone (Psf): F T -nano-TiO 2 UF and Psf: F C -nano-TiO 2 UF, was profoundly influenced by the benign distributions of the nanoadditives enriched with distinctly charged sites ( − SO 3 − H + ), as evidenced by superior morphology, improved topography, enhanced surface hydrophilicity and altered electrokinetic features. The membranes exhibited enhanced solvent throughputs, viz . 3500–4000 and 3400–4300 LMD at 1 bar of transmembrane pressure, without significant compromise in their rejection attributes. The flux recovery ratios and fouling resistive behaviours of MMMs towards bovine serum albumin indicated that the nanoadditives could impart stable and appreciable antifouling activity, potentially aiding in a sustainable ultrafiltration performance.

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Polydopamine-Assisted Two-Dimensional Molybdenum Disulfide (MoS2)-Modified PES Tight Ultrafiltration Mixed-Matrix Membranes: Enhanced Dye Separation Performance

Membranes ◽

10.3390/membranes11020096 ◽

2021 ◽

Vol 11 (2) ◽

pp. 96

Author(s):

Huali Tian ◽

Xing Wu ◽

Kaisong Zhang

Keyword(s):

Pore Size ◽

High Performance ◽

Pure Water ◽

Water Flux ◽

Rejection Rate ◽

Mixed Matrix Membranes ◽

Inversion Method ◽

Separation Performance ◽

Mixed Matrix ◽

Matrix Membranes

Tight ultrafiltration (TUF) membranes with high performance have attracted more and more attention in the separation of organic molecules. To improve membrane performance, some methods such as interface polymerization have been applied. However, these approaches have complex operation procedures. In this study, a polydopamine (PDA) modified MoS2 (MoS2@PDA) blending polyethersulfone (PES) membrane with smaller pore size and excellent selectivity was fabricated by a simple phase inversion method. The molecular weight cut-off (MWCO) of as-prepared MoS2@PDA mixed matrix membranes (MMMs) changes, and the effective separation of dye molecules in MoS2@PDA MMMs with different concentrations were obtained. The addition amount of MoS2@PDA increased from 0 to 4.5 wt %, resulting in a series of membranes with the MWCO values of 7402.29, 7007.89, 5803.58, 5589.50, 6632.77, and 6664.55 Da. The MWCO of the membrane M3 (3.0 wt %) was the lowest, the pore size was defined as 2.62 nm, and the pure water flux was 42.0 L m−2 h−1 bar−1. The rejection of Chromotrope 2B (C2B), Reactive Blue 4 (RB4), and Janus Green B (JGB) in aqueous solution with different concentrations of dyes was better than that of unmodified membrane. The separation effect of M3 and M0 on JGB at different pH values was also investigated. The rejection rate of M3 to JGB was higher than M0 at different pH ranges from 3 to 11. The rejection of M3 was 98.17–99.88%. When pH was 11, the rejection of membranes decreased with the extension of separation time. Specifically, at 180 min, the rejection of M0 and M3 dropped to 77.59% and 88.61%, respectively. In addition, the membrane had a very low retention of salt ions, Nacl 1.58%, Na2SO4 10.52%, MgSO4 4.64%, and MgCl2 1.55%, reflecting the potential for separating salts and dyes of MoS2@PDA/PES MMMs.

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Synthesis and Characterization of ZIF-8 Mixed Matrix Membranes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.625.661 ◽

2014 ◽

Vol 625 ◽

pp. 661-664

Author(s):

Chen Chuang Lok ◽

Yin Fong Yeong

Keyword(s):

Room Temperature ◽

Synthesis Method ◽

Mixed Matrix Membranes ◽

Inorganic Filler ◽

X Ray Diffraction ◽

Mixed Matrix ◽

Temperature Synthesis ◽

X Ray ◽

Matrix Membranes

In the present work, ZIF-8/6FDA-durene mixed matrix membranes (MMMs) were synthesized and characterized. ZIF-8 nanocrystals, which were used as the inorganic filler, were synthesized using rapid room-temperature synthesis method whereas 6FDA-durene polyimide was synthesized by polycondensation method followed by chemical imidization. Pure and 6FDA-durene membranes loaded with 5 wt%, 10 wt% and 15 wt% of ZIF-8 were fabricated. The structural properties and morphology of the resultant membranes were characterized by using X-ray Diffraction (XRD) and Field emission scanning electron microscope (FESEM) . The EDX images showed that ZIF-8 particles agglomerated in the polymer matrix. However, no phase separation was observed for all resultant MMMs.

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Mixed-Matrix Membranes Comprising of Polysulfone and Porous UiO-66, Zeolite 4A, and Their Combination: Preparation, Removal of Humic Acid, and Antifouling Properties

Membranes ◽

10.3390/membranes10120393 ◽

2020 ◽

Vol 10 (12) ◽

pp. 393

Author(s):

Tanzila Anjum ◽

Rahma Tamime ◽

Asim Laeeq Khan

Keyword(s):

Humic Acid ◽

High Performance ◽

Synergistic Effects ◽

Pure Water ◽

Water Flux ◽

Mixed Matrix Membranes ◽

Mixed Matrix ◽

Zeolite 4A ◽

Pure Water Flux ◽

Matrix Membranes

High-performance Mixed-Matrix Membranes (MMMs) comprising of two kinds of porous fillers UiO-66 and Zeolite 4Aand their combination were fabricated with polysulfone (PSf) polymer matrix. For the very first time, UiO-66 and Zeolite 4A were jointly used as nanofillers in MMMs with the objective of complimenting synergistic effects. The individual and complimentary effects of nanofillers were investigated on membrane morphology and performance, pure water flux, humic acid rejection, static humic acid adsorption, and antifouling properties of membranes. Scanning Electron Microscopy (SEM) analysis of membranes confirmed that all MMMs possessed wider macrovoids with higher nanofiller loadings than neat PSf membranes and the MMMs (PSf/UiO-66 and PSf/Zeolite 4A-UiO-66) showed tendency of agglomeration with high nanofiller loadings (1 wt% and 2 wt%). All MMMs exhibited better hydrophilicity and lower static humic acid adsorption than neat PSf membranes. Pure water flux of MMMs was higher than neat PSf membranes but the tradeoff between permeability and selectivity was witnessed in the MMMs with single nanofiller. However, MMMs with combined nanofillers (PSf/Zeolite 4A-UiO-66) showed no such tradeoff, and an increase in both permeability and selectivity was achieved. All MMMs with lower nanofiller loadings (0.5 wt% and 1 wt%) showed improved flux recovery. PSf/Zeolite 4A-UiO-66 (0.5 wt%) membranes showed the superior antifouling properties without sacrificing permeability and selectivity.

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Development of Adsorbents-based Cellulose Acetate Mixed Matrix Membranes for Removal of Pollutants from Textile Industry Effluent

Jurnal Teknologi ◽

10.11113/jt.v70.3425 ◽

2014 ◽

Vol 70 (2) ◽

Author(s):

R. Saranya ◽

Y. Lukka Thuyavan ◽

G. Arthanareeswaran

Keyword(s):

Membrane Permeability ◽

Cellulose Acetate ◽

Textile Industry ◽

Pure Water ◽

Mixed Matrix Membranes ◽

Dimethyl Formamide ◽

Mixed Matrix ◽

Phase Inversion Technique ◽

Industry Effluent ◽

Matrix Membranes

The influence of adsorbents like activated carbon (AC) and iron oxide nanoparticles (IO) on the filtration efficiency of polymeric ultrafiltration (UF) membranes is proposed to investigate by incorporating them in wt % of 0.25, 1.5 and 2.5 with cellulose acetate (CA). The completely homogenous CA/AC and CA/IO casting solutions were obtained by sonicating AC and IO, respectively in N, N’-dimethyl formamide (DMF) followed by mechanical stirring with CA. By dry/wet phase inversion technique, novel CA mixed matrix membranes (MMMs) were synthesized which were later evaluated for their characteristics using atomic force microscope (AFM), field emission scanning electron microscope (FESEM) and X-ray diffractometer (XRD). In comparison to the neat CA membrane, pure water flux of CA MMMs containing 2.5 wt % AC and 0.5 wt % IP were increased from 5.61 Lm-2h-1 to 11.22 and 7.17 Lm-2h-1, respectively. These results suggest that the higher addition of AC influenced the membrane permeability whereas the amount of IP is found not to be surpassed beyond 0.5 wt% for improved flux. The wettability found by contact angle analysis suggests the higher productivity of CA MMMs and are evident by the adsorption nature of the chosen fillers. The polymer enhanced UF studies for rejecting COD, BOD and dissolved salts from the textile industry effluent has also been performed. The significance of CA MMMs lies on higher rejection efficiency with no compromise in membrane permeability.

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Preparation and characterization of polysulfone/zeolite mixed matrix membranes for removal of low-concentration ammonia from aquaculture wastewater

Water Science & Technology ◽

10.2166/wst.2017.545 ◽

2017 ◽

Vol 77 (2) ◽

pp. 346-354 ◽

Cited By ~ 3

Author(s):

Pourya Moradihamedani ◽

Abdul Halim Abdullah

Keyword(s):

Pure Water ◽

Water Flux ◽

Mixed Matrix Membranes ◽

Mixed Matrix Membrane ◽

Mixed Matrix ◽

Low Concentration ◽

Pore Blockage ◽

Pure Water Flux ◽

Aquaculture Wastewater ◽

Matrix Membranes

Abstract Removal of low-concentration ammonia (1–10 ppm) from aquaculture wastewater was investigated via polysulfone (PSf)/zeolite mixed matrix membrane. PSf/zeolite mixed matrix membranes with different weight ratios (90/10, 80/20, 70/30 and 60/40 wt.%) were prepared and characterized. Results indicate that PSf/zeolite (80/20) was the most efficient membrane for removal of low-concentration ammonia. The ammonia elimination by PSf/zeolite (80/20) from aqueous solution for 10, 7, 5, 3 and 1 ppm of ammonia was 100%, 99%, 98.8%, 96% and 95% respectively. The recorded results revealed that pure water flux declined in higher loading of zeolite in the membrane matrix due to surface pore blockage caused by zeolite particles. On the other hand, ammonia elimination from water was decreased in higher contents of zeolite because of formation of cavities and macrovoids in the membrane substructure.

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Removal of Dyes Using Graphene Oxide (GO) Mixed Matrix Membranes

Membranes ◽

10.3390/membranes10120366 ◽

2020 ◽

Vol 10 (12) ◽

pp. 366

Author(s):

Rana J. Kadhim ◽

Faris H. Al-Ani ◽

Muayad Al-shaeli ◽

Qusay F. Alsalhy ◽

Alberto Figoli

Keyword(s):

Graphene Oxide ◽

Rejection Rate ◽

Mixed Matrix Membranes ◽

Permeation Flux ◽

Mixed Matrix ◽

Term Operation ◽

Water Permeation ◽

Pes Membrane ◽

Matrix Membranes

The application of membrane technology to remove pollutant dyes in industrial wastewater is a significant development today. The modification of membranes to improve their properties has been shown to improve the permeation flux and removal efficiency of the membrane. Therefore, in this work, graphene oxide nanoparticles (GO-NPs) were used to modify the polyethersulfone (PES) membrane and prepare mixed matrix membranes (MMMs). This research is dedicated to using two types of very toxic dyes (Acid Black and Rose Bengal) to study the effect of GO on PES performance. The performance and antifouling properties of the new modified membrane were studied using the following: FTIR, SEM, AFM, water permeation flux, dye removal and fouling, and by investigating the influence of GO-NPs on the structure. After adding 0.5 wt% of GO, the contact angle was the lowest (39.21°) and the permeable flux of the membrane was the highest. The performance of the ultrafiltration (UF) membrane displayed a rejection rate higher than 99% for both dyes. The membranes showed the highest antifouling property at a GO concentration of 0.5 wt%. The long-term operation of the membrane fabricated from 0.5 wt% GO using two dyes improved greatly over 26 d from 14 d for the control membrane, therefore higher flux can be preserved.

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Fabrication and Characterization of Polysulfone-Zeolite ZSM-5 Mixed Matrix Membrane for Heavy Metal Ion Removal Application

Journal of Applied Membrane Science & Technology ◽

10.11113/amst.v18i1.17 ◽

2017 ◽

Vol 18 (1) ◽

Author(s):

G. P. Syed Ibrahim ◽

Arun M. Isloor ◽

Amir Al Ahmed ◽

B. Lakshmi

Keyword(s):

Heavy Metal ◽

Metal Ion ◽

Pure Water ◽

Water Flux ◽

Mixed Matrix Membranes ◽

Mixed Matrix Membrane ◽

Inversion Method ◽

Mixed Matrix ◽

Matrix Membranes

Mixed matrix membranes (MMMs) of Polysulfone (PSf)-Zeolite ZSM-5 (ZZSM-5) were prepared by phase inversion method with a dose ranging from 1.0 to 4.0 Wt. % with polyvinylpyrrolidone (PVP) as the fore forming agent. The prepared mixed matrix membranes were scrutinized for their permeation, hydrophilicity and anti-fouling nature. Characterization of the membrane was carried out by Electrokinetic analyzer. The heavy metal ions rejection experiment has been carried out and the results manifested that, the PZM-4 membrane exhibits higher pure water flux of 348.88 L/m2 h, contact angle of 72.7o and the heavy meals rejection of Pb2+ (98.54%) and of Cd2+ (95.32%) ions. Taken as a whole, the modified PSf-ZZSM-5 ultrafiltration membranes are the attractive candidate for the water treatment.

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Fabrication of Amino-Functionalized CAU-1/Cellulose Acetate Mixed Matrix Membranes for CO2/N2 Separation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.797.39 ◽

2019 ◽

Vol 797 ◽

pp. 39-47 ◽

Cited By ~ 2

Author(s):

Yin Fong Yeong ◽

Tou Seng Khoo

Keyword(s):

Cellulose Acetate ◽

Mixed Matrix Membranes ◽

Cellulose Acetate Membrane ◽

X Ray Diffraction ◽

Polymer Phase ◽

Mixed Matrix ◽

X Ray ◽

Pure Cellulose ◽

New Type ◽

Matrix Membranes

In this work, a new type of mixed matrix membranes comprising of amino-functionalized CAU-1 as filler and cellulose acetate as polymer phase were fabricated for CO2 separation from N2. The crystallinity and morphology of the resultant fillers were verified by using X-ray diffraction (XRD) and scanning electron microscope (SEM). The energy-dispersive X-ray (EDX) results showed that, sedimentation and agglomeration of fillers were found at loading of more than 5 wt%. Subsequently, the gases permeation results revealed that, an increase in CO2 permeability and CO2/N2 selectivity of 149% and 81%, respectively, were achieved for the membrane loaded with 5 wt% of CAU-1-NH2, as compared to pure cellulose acetate membrane.

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Functionalized KIT-6/Polysulfone Mixed Matrix Membranes for Enhanced CO2/CH4 Gas Separation

Polymers ◽

10.3390/polym12102312 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2312

Author(s):

Thiam Leng Chew ◽

Sie Hao Ding ◽

Pei Ching Oh ◽

Abdul Latif Ahmad ◽

Chii-Dong Ho

Keyword(s):

Gas Separation ◽

Gas Permeation ◽

Mixed Matrix Membranes ◽

Separation Performance ◽

X Ray Diffraction ◽

Mixed Matrix ◽

X Ray ◽

The Matrix ◽

Adsorption Desorption ◽

Matrix Membranes

The development of mixed matrix membranes (MMMs) for effective gas separation has been gaining popularity in recent years. The current study aimed at the fabrication of MMMs incorporated with various loadings (0–4 wt%) of functionalized KIT-6 (NH2KIT-6) [KIT: Korea Advanced Institute of Science and Technology] for enhanced gas permeation and separation performance. NH2KIT-6 was characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and N2 adsorption–desorption analysis. The fabricated membranes were subjected to FESEM and FTIR analyses. The effect of NH2KIT-6 loading on the CO2 permeability and ideal CO2/CH4 selectivity of the fabricated membranes were investigated in gas permeation and separation studies. The successfulness of (3-Aminopropyl) triethoxysilane (APTES) functionalization on KIT-6 was confirmed by FTIR analysis. As observed from FESEM images, MMMs with no voids in the matrix were successfully fabricated at a low NH2KIT-6 loading of 0 to 2 wt%. The CO2 permeability and ideal CO2/CH4 selectivity increased when NH2KIT-6 loading was increased from 0 to 2 wt%. However, a further increase in NH2KIT-6 loading beyond 2 wt% led to a drop in ideal CO2/CH4 selectivity. In the current study, a significant increase of about 47% in ideal CO2/CH4 selectivity was achieved by incorporating optimum 2 wt% NH2KIT-6 into the MMMs.

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