scholarly journals Novel High Flux Poly(m-phenylene isophtalamide)/TiO2 Membranes for Ultrafiltration with Enhanced Antifouling Performance

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2804
Author(s):  
Mariia Dmitrenko ◽  
Anna Kuzminova ◽  
Andrey Zolotarev ◽  
Vladislav Liamin ◽  
Tatiana Plisko ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Optimal Transport ◽  
Membrane Separation ◽  
Pure Water ◽  
Cutting Fluid ◽  
Separation Performance ◽  
Recovery Ratio ◽  
High Flux ◽  
Water Contact ◽  
Tio2 Particles

Wide application of ultrafiltration in different industrial fields requires the development of new membranes with tailored properties and good antifouling stability. This study is devoted to the improvement of ultrafiltration properties of poly(m-phenylene isophtalamide) (PA) membranes by modification with titanium oxide (TiO2) particles. The introduction of TiO2 particles improved membrane separation performance and increased antifouling stability and cleaning ability under UV irradiation. The developed membranes were characterized by scanning electron and atomic force microscopy methods, the measurements of water contact angle, and total porosimetry. The transport properties of the PA and PA/TiO2 membranes were tested in ultrafiltration of industrially important feeds: coolant lubricant (cutting fluid) emulsion (5 wt.% in water) and bovine serum albumin (BSA) solution (0.5 wt.%). The PA/TiO2 (0.3 wt.%) membrane was found to possess optimal transport characteristics in ultrafiltration of coolant lubricant emulsion due to the highest pure water and coolant lubricant fluxes (1146 and 32 L/(m2 h), respectively), rejection coefficient (100%), and flux recovery ratio (84%). Furthermore, this membrane featured improved ability of surface contamination degradation after UV irradiation in prolonged ultrafiltration of BSA, demonstrating a high flux recovery ratio (89–94%).

scholarly journals Preparation of antibacterial and antifouling PSF/ZnO/eugenol membrane for peat water ultrafiltration

2019 ◽  
Vol 19 (8) ◽  
pp. 2248-2255 ◽  
Author(s):  
I Gede Wenten ◽  
Yuda S. Syaifi ◽  
Firmansyah A. Saputra ◽  
Megawati Zunita ◽  
Putu T. P. Aryanti ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Pure Water ◽  
Antibacterial Properties ◽  
Recovery Ratio ◽  
Water Contact ◽  
Hydrophilic Nature ◽  
Phase Inversion Technique ◽  
Blending Method ◽  
Antibacterial Assay ◽  
Inhibition Zones

Abstract In this work, polysulfone (PSF)-based ultrafiltration (UF) membrane with antibacterial and antifouling properties was prepared by the phase inversion technique. ZnO and eugenol were used as additives and introduced into the membrane matrix via the additive blending method. The additives could improve the performance of the PSF membrane due to their hydrophilic nature. The water contact angle (WCA) of the PSF membrane decreased from 67.7° ± 1.2° to 52.8° ± 0.8° when the additive loading was increased from 0 to 5%-wt. The PSF membrane with 5%-wt ZnO and 5%-wt eugenol had pure water permeability and humic substance rejection of 83.8 ± 3.7 L m−2 h−1 bar−1 and 95.6%, respectively. In addition, the additives were able to improve antifouling properties, e.g. a recovery ratio (FRR) of 85.4% and relative flux reduction ratio (RFR) of 30.2%. In the antibacterial assay, the membrane displayed 3 mm and 10 mm inhibition zones against Escherichia coli and peat water microorganisms, respectively, probably due to antibacterial properties of the additives.

Improved separation performance of SS fiber nonwoven felt by the coating of a non-isotropic porous SS membrane layer

2021 ◽  
pp. 004051752110542
Author(s):  
Hongbin Li ◽  
Wenying Shi ◽  
Tengfei Li ◽  
Qiyun Du ◽  
Haixia Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Pore Size ◽  
Sintering Temperature ◽  
Potato Starch ◽  
Pure Water ◽  
Separation Performance ◽  
Separation And Purification ◽  
Chemical Cleaning ◽  
Water Contact ◽  
Membrane Layer

With excellent mechanical properties, large porosity, and permeability, stainless steel (SS) fiber nonwoven felt has outstanding application advantages in high-temperature filtration and purification. However, the pore size of the SS nonwoven felt, which is directly determined by the diameter of the produced fiber stacked inside, usually varies from tens of microns to several microns. Low filtration accuracy greatly limits its application in the fields of fine separation and purification. In this study, the separation performance of SS fiber nonwoven felt was improved by the coating of a non-isotropic porous SS membrane layer via the immersion precipitation phase inversion-sintering method. The effects of sintering temperature on pore structure, surface wettability, separation performance, and mechanical properties of the coated SS nonwoven felt were characterized by scanning electron microscope (SEM), water contact angle (WCA), water permeability, and tensile test, respectively. The results suggest that with the increase of sintering temperature from 1000°C to 1200°C, both porosity and pore size reduce gradually. The WCA value shows an increase from 31.4 to 62.3° and pure water flux shows a corresponding decrease from 2562 to 889 L . m−2 . h−1. The sintering temperature has a negative effect on the mechanical strength of the coated SS fiber nonwoven felt, which is mainly determined by the mechanical properties of the sintered SS fiber nonwoven felt substrate. The coated SS fiber nonwoven felt exhibits a long-term durable separation performance even after frequent combined physical washing and chemical cleaning when applied in the treatment of potato starch wastewater.

Preparation and Properties of Poly(ether imide) Ultrafiltration Membrane Modified with Polyether Diamine

2014 ◽  
Vol 931-932 ◽  
pp. 63-67 ◽  
Author(s):  
Pattama Phomdum ◽  
Watchanida Chinpa
Keyword(s):  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Skin Layer ◽  
Recovery Ratio ◽  
Water Contact ◽  
Pure Water Flux ◽  
Modified Membrane ◽  
Bsa Rejection ◽  
Scanning Electron

In this study, the morphologies, the hydrophilicity, and the anti-fouling of poly (ether imide) (PEI) membrane modified with an aqueous solution of polyether diamine predominantly PEO backbone (PEO-diamine) were investigated. A decrease in water contact angle and an increase in water absorption ratio indicated the hydrophilicity of modified membrane. Scanning Electron Microscope (SEM) showed a thinner skin layer of membrane and pores on the membrane surface for modified PEI membrane providing an increment of pure water flux and a reduction of BSA rejection of membrane. Under the protein filtration study, it was found that the flux recovery ratio of modified PEI membrane was higher than that of the unmodified PEI membrane.

scholarly journals Graphene Oxide (GO)-Blended Polysulfone (PSf) Ultrafiltration Membranes for Lead Ion Rejection

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 77 ◽  
Author(s):  
Harish Ravishankar ◽  
Jens Christy ◽  
Veeriah Jegatheesan
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Mechanical Strength ◽  
Positive Reinforcement ◽  
Pure Water ◽  
Environmental Scanning Electron Microscopy ◽  
Membrane Properties ◽  
Lead Ion ◽  
High Flux ◽  
Water Contact

Graphene oxide (GO) has been widely reported and used for treatment of heavy metals from different waste streams. Although their use as additives for membranes has greatly enhanced membrane properties, there is still a bottleneck in obtaining membranes with high heavy-metal rejection efficiencies while maintaining high flux, mechanical strength, and porosity. In the present study, different compositions of GO (0–1 wt %)-blended membranes were prepared using 1-methyl-2-pyrrolidone (NMP) as solvent and water with 5% ethanol as non-solvent, and studied for the rejection of the chosen model heavy-metal lead. The prepared membranes were characterized for hydrophilicity, membrane porosity, flux, permeability, pore-size, mechanical strength, and membrane morphology. From the results, it was inferred that membranes having maximum GO in their blend (1 wt %) showed better hydrophilicity (water contact angle 34.2°), porosity (82.2%), permeability (52.1 L/m2 h bar), and pure water flux (163.71 L/m2 h) at 3-bar pressure as opposed to other compositions. The pore sizes of the membranes ranged between 18 to 24 nm. Tensile strength tests showed the role of GO as a positive reinforcement on the mechanical properties of membranes through Young’s modulus (188.13 ± 15.36 MPa) for the membrane having 0.25 wt % GO composition. Environmental Scanning Electron Microscopy (ESEM) images displayed the dense top layer supported by a porous, finger-like structure, obtained from instantaneous de-mixing favored by NMP and GO. The observed reduction in flux of lead solution for GO-blended membranes was due to osmotic pressure build-up caused by the retained nitrate salt by GO on the retentate side of the membrane. A maximum rejection of 98% was achieved with 1 wt % GO membrane at 1-bar pressure with flux of 43.62 L/m2 h, which decreased to 94% at 3-bar pressure with flux of 142.95 L/m2 h. These results showed how the application of NMP as solvent and GO as an additive could facilitate in obtaining high-flux and high-rejection membranes.

Long-Term Stable Metal Organic Framework (MOF) Based Mixed Matrix Membranes for Ultrafiltration

2020 ◽  
Author(s):  
Muayad Al-shaeli ◽  
Stefan J. D. Smith ◽  
Shanxue Jiang ◽  
Huanting Wang ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Mixed Matrix Membranes ◽  
Recovery Ratio ◽  
Mixed Matrix ◽  
Water Contact ◽  
Membrane Performance ◽  
Metal Organic ◽  
Matrix Membranes

<p>In this study, novel <a>mixed matrix polyethersulfone (PES) membranes</a> were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH<sub>2</sub>. The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH<sub>2</sub> nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH<sub>2</sub> are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.</p>

scholarly journals Designing of a novel polyvinylidene fluoride/TiO2/UiO-66-NH2 membrane with photocatalytic antifouling properties using modified zirconium-based metal-organic framework

2021 ◽  
Author(s):  
Yi-Jing Li ◽  
Gui-E Chen ◽  
Lian-Jing Liu ◽  
Zhen-Liang Xu ◽  
Sun-Jie Xu ◽  
...  
Keyword(s):  
Phase Separation ◽  
Bovine Serum Albumin ◽  
Polyvinylidene Fluoride ◽  
Metal Organic Framework ◽  
Rejection Rate ◽  
Separation Performance ◽  
Recovery Ratio ◽  
Quantitative Measurements ◽  
Metal Organic ◽  
Bsa Rejection

Abstract Novel polyvinylidene fluoride/TiO2/UiO-66-NH2 (PVDF/TiUN) membranes were produced by the delay phase separation method via introducing the TiO2/UiO-66-NH2 (TiUN) nanocomposite into PVDF casting solution. Interconnection of TiO2 and UiO-66-NH2 improved photocatalysis capacity and endowed PVDF/TiUN membranes with self-cleaning capability. Quantitative measurements showed that, firstly, PVDF/TiUN membranes exhibited improved photodegradation kinetics and efficiency (up to 88.1%) to Rhodamine B (RhB). Secondly, the performances of bovine serum albumin (BSA) rejection and permeation of PVDF/TiUN membranes outperformed those of other check samples, indicating enhanced hydrophilicity. Thirdly, rejection rate of BSA reached to breathtaking 98.14% and flux recovery ratio (FRR) of BSA reached breathtaking 95.37%. Thus, given their excellent anti-contamination property and separation performance, the PVDF/TiUN membrane is very likely to be a novel water treatment membrane.

Facile fabrication of photoinduced superhydrophobic–superhydrophilic surfaces on cellulose substrate without strength loss

2018 ◽  
Vol 89 (9) ◽  
pp. 1807-1822
Author(s):  
Yunjie Yin ◽  
Yanyan Zhang ◽  
Xiaoqian Ji ◽  
Tao Zhao ◽  
Chaoxia Wang
Keyword(s):  
Mechanical Properties ◽  
Uv Irradiation ◽  
Uv Curing ◽  
Contact Angles ◽  
Curing Process ◽  
Water Contact ◽  
Cellulose Substrate ◽  
Cellulose Substrates ◽  
Uv Curing Process ◽  
Modified Cellulose

A novel strategy was reported on the design and fabrication of functional photosensitive hybrid sols (FPHSs) by non-alcoholic emulsification in the presence of a TiO2 nanoparticle and photoinitiator via a sol-gel process using tetraethylorthosilicate, γ-methacryloxypropyltrimethoxysilane (MPS) and hydrophobic silane coupling agents as precursors. Smart cellulose substrates with alterable superhydrophobic–superhydrophilic conversion were fabricated using FPHS via the ultraviolet (UV) curing process. The liquid FPHS was photocured into solid gel during UV irradiation for 40 s with MPSs in FPHS, which was verified via Fourier transform infrared spectra. The cellulose substrates were modified with FPHSs, and the water contact angles of the modified cellulose substrates were more than 150°. The superhydrophobicity was improved by the gathering of hydrophobic chains and particle deposition of hybrid gel on the fiber surface. Nevertheless, the water contact angles of the modified cellulose substrates were receded with UV irradiation from 158° to 0° in 200 min, due to TiO2 photoinduction. The irradiated cellulose substrates were placed in the dark, and the water contact angles were recovered to about 130°, gradually. What is more, the reversible process can be repeated more than eight times. The modified cellulose substrate presented excellent washing fastness, even suffering 10 times washing processing. The mechanical properties, including breaking strength and elongation rate, were improved after the coating and UV curing process, which considerably remedied the defects of the heating curing process on the mechanical properties.

The Optimization of RHS-polysulfone Membrane towards Operating Condition for Humic Acid Removal

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Mohd Riduan Jamalludin ◽  
◽  
Siti Khadijah Hubadillah ◽  
Zawati Harun ◽  
Muhamad Zaini Yunos ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Ionic Strength ◽  
Membrane Separation ◽  
Pure Water ◽  
Water Flux ◽  
Separation Process ◽  
Transmembrane Pressure ◽  
Polysulfone Membrane ◽  
Optimal Value ◽  
Pure Water Flux

This study investigates the effects of rice husk silica (RHS) as additive in the polysulfone membrane to enhance antifouling properties in membrane separation process. The performance (of what?) was evaluated in term of pure water flux (PWF), rejection and antifouling properties. The optimized of normalized flux (Jf /Jo) at different parameter in filtration (pH, ionic strength and tranmembrane-pressure) was carried out by using the response surface methodology (RSM). The results showed that the addition of 4 wt. % RHS give the highest flux at 300.50 L/m².hour (LMH). The highest rejection was found at 3 wt. % of RHS membrane with value 98% for UV254 and 96% for TOC. The optimal value of Jf/Jo was found at 0.62 with the condition of pH: 6.10, ionic strength: 0.05 mol/L and transmembrane-pressure: 2.67 bars. Optimize of RSM analysis from ANOVA also proved that the error of model is less than 0.05% which indicates that the model is significant.

scholarly journals Fabrication of a Novel Antifouling Polysulfone Membrane with in Situ Embedment of Mxene Nanosheets

2019 ◽  
Vol 16 (23) ◽  
pp. 4659 ◽  
Author(s):  
Zhen Shen ◽  
Wei Chen ◽  
Hang Xu ◽  
Wen Yang ◽  
Qing Kong ◽  
...  
Keyword(s):  
Contact Angle ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Water Contact Angle ◽  
Bovine Serum ◽  
Composite Membranes ◽  
Recovery Ratio ◽  
Water Contact ◽  
Polysulfone Membrane

Membrane fouling is still a critical issue for the application of ultrafiltration, which has been widely used in water treatment due to its efficiency and simplicity. In order to improve the antifouling property, a new 2D material MXene was used to fabricate composite ultrafiltration membrane with the approach of in situ embedment during the phase inversion process in this study. Scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), water contact angle, bovine serum albumin rejection and porosity measurements were utilized to characterize the prepared membranes. Due to the hydrophilicity of the MXene, the composite membranes obtained higher hydrophilicity, confirmed by the decreased water contact angle. All the modified membranes had a high bovine serum albumin rejection above 90% while that of the pristine polysulfone membrane was 77.48%. The flux recovery ratio and the reversible fouling ratio of the membranes were also improved along with the increasing content of the MXene. Furthermore, the highest flux recovery ratio could also reach 76.1%. These indicated the good antifouling properties of MXene composite membranes. The enhanced water permeability and protein rejection and excellent antifouling properties make MXene a promising material for antifouling membrane modification.

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