Pervaporation performance of surface-modified zeolite/PU mixed matrix membranes for separation of phenol from water

Ye, Hong; Zhang, Xiang; Zhao, Zixuan; Song, Boyu; Zhang, Zhongguo; Song, Weiwei

doi:10.1007/s13726-017-0509-1

Cited by 15 publications

(13 citation statements)

References 39 publications

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“…Each molecule of IPDI possesses two isocyanate moieties that react with hydroxyl groups present in the polyol as well as on the inorganic microparticle surfaces, forming urethane linkages between the inorganic and the organic components (Figure A). In the solventless formulations, the polyol and the inorganic microparticles were introduced in small amounts intermittently into IPDI to achieve homogeneous mixing along with dibutyltin dilaurate (DBTDL) to catalyze the linkage reaction. , The polyol aided the workability of these highly filled mixtures, thereby eliminating the need for a solvent and the challenges associated with subsequent solvent removal, such as longer curing times, higher energy consumption, cost, and environmental toxicity, thus making our approach environmentally viable and scalable.…”

Section: Resultsmentioning

confidence: 99%

“…Here, we demonstrate an alternate upcycling strategy to utilize recycled polyols by incorporating them in lightweight composites comprising naturally occurring aluminosilicate microparticles covalently bridged in situ by a ductility-enhancing and fracture-resisting organic phase composed of polyols and reactive isocyanates. Our fabrication approach draws inspiration from synthesis approaches for covalently bound polymer–nanoparticle composites with high filler loadings , and ameliorates aggregation of inorganic micron-sized particles , by employing reactive isocyanates that facilitate covalent linkages between the organic and inorganic phases. Our solvent-free fabrication approach involves casting mixtures of inorganic microparticles, recycled polyols, and reactive isocyanates, all commercially available, and curing for 24–48 h at moderate (25–50 °C) temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Organic–Inorganic Composites Based on Glycolyzed Polyurethane

Iyer

Gallagher²,

Simonetti

et al. 2022

ACS Sustainable Chem. Eng.

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We present a simple approach to upcycle glycolyzed polyurethane foam products by fabricating robust, highly filled organic/inorganic composites (46–60 wt % solid loading). These composites, consisting of recycled polyols, naturally occurring or synthetic aluminosilicate minerals, and isocyanate linkers, are shown to possess superior mechanical (flexural) properties compared to ordinary Portland cement (OPC). Optimization of chemical composition (isocyanate and inorganic content) and curing temperatures (25–50 °C) results in low-density composites (up to 3× less dense than OPC) with flexural strengths comparable to OPC while exhibiting strain capacities up to 5× as compared to OPC-based systems. In contrast, parallel fabrication approaches using low OH-value virgin polyols resulted in flexible composites and much lower flexural strengths, highlighting the advantage of employing high −OH density recycled polyols. Variations in the flexural strength of the composites were correlated with differences in their morphologyuniformity in the distribution of inorganic particles contributed to improved flexural properties. The generality of this fabrication approach is demonstrated using quartz sand as the inorganic particle and recycled polyols with different hydroxyl values.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Organic–Inorganic Composites Based on Glycolyzed Polyurethane

Iyer

Gallagher²,

Simonetti

et al. 2022

ACS Sustainable Chem. Eng.

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show abstract

“…The HA filtration measurement was carried out in transmembrane pressure of 1.5 bar. Three samples were (10) HA adsorption capacity =…”

Section: Analyses Of Fouling Resistancesmentioning

confidence: 99%

“…Recently, nanocomposite membranes have been applied in membrane technology for the removal of pollutants from water to wastewater [10]. Polymer nanocomposite membranes are formed by incorporation of nanoparticles into polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and anti-fouling properties of cellulose acetate/polyethylene glycol-grafted nanodiamond nanocomposite membranes for humic acid removal from contaminated water

et al. 2018

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Polyethylene glycol-grafted nanodiamond (ND-PEG) was synthesized from pristine detonation NDs and utilized to prepare novel cellulose acetate/polyethylene glycol-grafted nanodiamond(CA/ND-PEG)nanocomposite membranes. Due to unique thermal, mechanical, and antibacterial properties and very easy cleaning of fouled ND-embedded CA nanocomposite membranes, we tried to investigate the performance of CA/ND-PEG membrane for humic acid (HA) removal from contaminated water. Surface functionalization was confirmed by Fourier transform infrared spectroscopy and thermogravimetry analysis. Pristine and functionalized ND with different concentration was added in the casting solution containing CA. The prepared membranes were characterized using contact angle, mechanical strength, scanning electron microscopy (SEM), transmission electron microscopy, and permeation tests. SEM micrographs of the surface of the membranes depicted the increase in the number of pores by the addition of ND and especially ND-PEG into polymer matrix. The results indicated that the nanocomposite membrane with 0.5 wt% ND-PEG exhibited excellent hydrophilicity, mechanical properties, permeability, high rejection, high abrasion resistance, and good anti-fouling performance. The HA adsorption on the membrane surface decreased from 2.85 to 2.15 mg cm −2 when the ND-PEG content increased from 0 to 0.5 wt%. Most importantly, the HA filtration experiments revealed that the incorporation of ND and especially ND-PEG particles reduced membrane irreversible fouling, dramatically. Meanwhile, the analysis of the fouling mechanism based on Hermia's model revealed that cake formation is a prevailing mechanism for all membranes.

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“…Probably, the resulting composite membranes can exhibit excellent performance. Several studies have shown that the development of typical composite membranes with antifouling behavior has demonstrated superior performances in diverse applications such as solvent extraction, pervaporation, desalination, volatile organic extraction from the air, microextraction, the concentration of pharmaceutical waste, and dehumidification [43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Zeolite ZSM-22 Precursor on a UF-PES Selective Substrate Layer for Salts Rejection

2022

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Fabrication of the ZSM-22/Polyethersulfone (ZSM-22/PES) membranes as selective salt filters represent a growing membrane technological area in separation with the potential of high economic reward based on its low energy requirements. The incorporation of ZSM-22 zeolite material as additives into the PES polymer matrix has the prospective advantage of combining both the zeolite and polymer features while overcoming the limitations associated with both materials. This work investigated the influence of the nature of the silica precursor on ZSM-22 zeolite hydrothermally synthesised using colloidal (C60) and fumed (C60) silica to Si/Al of 60. The successful synthesis of the highly crystalline zeolitic materials was confirmed through XRD, FTIR, and SEM with EDX. The ZSM-22 additives were directly dispersed into a PES polymeric matrix to form a casting solution for the preparation of the ZSM-22/PES selective substrate layers via a phase inversion method for salts rejection. The polymeric PES was selected as an organic network in which the content of the ZSM-22 zeolite (ranging between 0 and 1.0 wt.%), was obtained and characterised by XRD, FTIR, and SEM analysis, as well as water contact angle (WCA) measurement and dead-end filtration cell. The phase inversion preparation method has induced the resulting ZSM-22/PES NF substrates anisotropy, as attributed to a high water flux to the above 700 L·m−2·h−1; high selectivity and rejection of salts to above 80% is revealed by the obtained results. The materials also exhibited improved antifouling behavior to above 70% flux recovery ratios. As such, the nature of the silica precursor influences ZSM-22 zeolite synthesis as a potential additive in the PES polymer matrix and led to the enhanced performance of the pure PES ultrafiltration membrane.

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Pervaporation performance of surface-modified zeolite/PU mixed matrix membranes for separation of phenol from water

Cited by 15 publications

References 39 publications

Hybrid Organic–Inorganic Composites Based on Glycolyzed Polyurethane

Hybrid Organic–Inorganic Composites Based on Glycolyzed Polyurethane

Synthesis, characterization, and anti-fouling properties of cellulose acetate/polyethylene glycol-grafted nanodiamond nanocomposite membranes for humic acid removal from contaminated water

Influence of the Zeolite ZSM-22 Precursor on a UF-PES Selective Substrate Layer for Salts Rejection

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