Pervaporation separation of ethyl acetate from aqueous solutions using ZSM-5 filled dual-layer poly(ether-<i>block</i>-amide)/polyethersulfone membrane

Vatani, Mostafa; Raisi, Ahmadreza; Pazuki, Gholamreza

doi:10.1039/c7ra13382k

Cited by 12 publications

(13 citation statements)

References 58 publications

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“…Static water contact angle (SWCA) values for pristine PEBA and composites (see also Figure S1 ) are shown in Table 2 . SWCA for pristine PEBA is very close to the value reported for a PEBAX ® 2533 membrane also prepared by casting method (81 ± 2° [ 39 ]). PEBA_LDH membranes presented lower SWCA values indicating an increase in surfaces hydrophilicity.…”

Section: Resultssupporting

confidence: 83%

“…FT-IR spectra of pristine PEBA and PEBA composites containing Cl-LDHs and the composites containing the NaNAP salt and NAP-LDHs are shown in Figure S4a,b, respectively; the bands tentative assignment is compiled in Table 3. For PEBA (wavenumbers indicated in blue in Figure S4a), the PA portion originates the bands at 3300, 1638, 1541 and 1242 cm −1 , attributed to hydrogen bounded amide group, and also the band at 720 cm −1 assigned to the CH 2 bending of the alkyl portion [28,39,41,[45][46][47][48]. The strong band at 1104 cm −1 is assigned to the C-O-C stretching of ether group (PE portion).…”

Section: Sample Characterizationmentioning

confidence: 99%

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Polymer/Iron-Based Layered Double Hydroxides as Multifunctional Wound Dressings

et al. 2020

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This work presents the development of multifunctional therapeutic membranes based on a high-performance block copolymer scaffold formed by polyether (PE) and polyamide (PA) units (known as PEBA) and layered double hydroxide (LDH) biomaterials, with the aim to study their uses as wound dressings. Two LDH layer compositions were employed containing Mg2+ or Zn2+, Fe3+ and Al3+ cations, intercalated with chloride anions, abbreviated as Mg-Cl or Zn-Cl, or intercalated with naproxenate (NAP) anions, abbreviated as Mg-NAP or Zn-NAP. Membranes were structurally and physically characterized, and the in vitro drug release kinetics and cytotoxicity assessed. PEBA-loading NaNAP salt particles were also prepared for comparison. Intercalated NAP anions improved LDH–polymer interaction, resulting in membranes with greater mechanical performance compared to the polymer only or to the membranes containing the Cl-LDHs. Drug release (in saline solution) was sustained for at least 8 h for all samples and release kinetics could be modulated: a slower, an intermediate and a faster NAP release were observed from membranes containing Zn-NAP, NaNAP and Mg-NAP particles, respectively. In general, cell viability was higher in the presence of Mg-LDH and the membranes presented improved performance in comparison with the powdered samples. PEBA containing Mg-NAP sample stood out among all membranes in all the evaluated aspects, thus being considered a great candidate for application as multifunctional therapeutic dressings.

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Section: Resultssupporting

confidence: 83%

Section: Sample Characterizationmentioning

confidence: 99%

Polymer/Iron-Based Layered Double Hydroxides as Multifunctional Wound Dressings

et al. 2020

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“…Estimation of NaABI solubility in saline solution is important to preclude its precipitation in the conditions in which the in vitro ABI release assays were conducted. [299] and close to the value reported in Chapter 7 (Table 7.3) for PEBAX ® 2533 membranes prepared by casting method. PEBA_NaABI membrane presented a lower SWCA value (62 ± 3 °); an expected behavior due to the presence of particles of a salt.…”

Section: In Vitro Abi Release Assayssupporting

confidence: 88%

“…7.4. For PEBA (wavenumbers indicated in blue), PA portion originates the bands at 3300, 1638, 1541, and 1242 cm -1 , attributed to hydrogen bonded amide group, and also the band at 720 cm -1 assigned to the CH2 bending of the alkyl portion [196,197,281,283,[285][286][287]. The strong band at 1104 cm -1 is assigned to the C-O-C stretching of ether group (PE portion).…”

Section: Samples Characterizationmentioning

confidence: 99%

Iron-based Layered Double Hydroxides aiming biomaterials: structure, composition, and polymer composites

Figueiredo¹

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por ter feito com que eu me apaixonasse pela química inorgânica; por ser minha referência em didática e comprometimento com o ensino. Obrigada por representar tanto em minhas bases químicas e por ter me ensinado tanto; por ter me aceito como sua orientanda e por ter me depositado confiança ao longo de todos esses anos.André Eduardo Zaidan, por ter me apresentado à universidade pública e à ciência e por ter me mostrado que era possível alcançá-las, auxiliando-me academicamente e emocionalmente ao longo desta jornada. Por me inspirar com seu profundo interesse pelo conhecimento, com seu pensamento crítico, e por suas ações serem fiéis aos seus ideais e pensamentos. Espero conseguir traduzir com simplicidade, porém com fidelidade e formalismo, a grandiosidade da química, assim como você faz com a física e com a matemática.Ana Maria Fernandes Pires Figueiredo, por me inspirar com tamanha bondade; por todos os anos de seu esforço para que eu pudesse estudar e para que eu tivesse oportunidades; por você ter me dito uma certa vez "não importa qual o seu sonho ou quão difícil ele possa ser, eu vou te apoiar". Seu apoio me possibilitou tantas coisas, dentre elas esta tese, à qual dedico a você. José Roberto Nubié Figueiredo por me incentivar a me aventurar nas ciências exatas, por me introduzir à química, por ter estudado comigo; por ter estado comigo em tantos exames que prestei, me incentivando nos momentos de frustração e vibrando comigo nos momentos de conquistas.Roberta Pires Figueiredo de Mendonça por ter me ajudado a permanecer no ensino superior, me amparando material e emocionalmente. Serei sempre para você, e para a linda família que construiu, como as águas do mar, que mesmo que se recolham, sempre retornam à praia. Não importa de qual oceano estaremos mais perto no futuro, as águas sempre nos conectarão.Luísa Figueiredo de Mendonça, por fazer crescer amor aonde quer que o seu sorriso chegue e por me motivar a lutar pela carreira científica e poder contribuir, mesmo que um pouquinho, para que sua geração tenha acesso a mais tecnologias e qualidade de vida.Renata Figueiredo Pilon por ter me ajudado a tomar a decisão de mudar os rumos da minha educação, em direção às desafiadoras Universidades Públicas e aos anos de intenso estudo e dedicação. Por estar sempre ao meu lado, vibrando e vivenciando comigo. Por ser minha segunda mãe.

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“…Among several methods for membrane surface modification, plasma treatment is frequently used in PV due to its ability to change the chemistry of the top surface region of the membrane as a dry method. Surface modification by plasma treatment was used in composite membranes to increase the PV selectivity for the separation of azeotropic methanol/ toluene mixtures, 19 methanol/methyl tert-butyl ether separation by polymerization of acrylic acid (AA) on poly (3-hydroxybutyrate) membranes, 20 the separation of ethyl acetate from water employing a dual-layer mixed matrix membrane, 21 the recovery of ethyl acetate from aqueous solution, 22 the dehydration transport properties of isopropyl alcohol-water in polyvinyl alcohol membranes, 23 and ethanol from water solution mixtures. 24 Vacuum ultraviolet (VUV) is an important component within a plasma source, and many studies have been dedicated to understanding the role of VUV and UV radiation in plasma treatment, in particular when polymer surfaces are involved.…”

Section: Introductionmentioning

confidence: 99%

Enhanced glycerol dehydration of pervaporation cross‐linkedPVAmembranes modified byVUV/UV‐Ctreatments

Backes

Weibel

2021

J of Applied Polymer Sci

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The high glycerol miscibility in water needs more efficient processes to decrease the cost of dehydration. Water stable poly(vinyl alcohol) based membranes cross‐linked with 15% w/w of maleic acid were used for dehydrating glycerol‐water mixtures using pervaporation (PV). The membranes were characterized using water contact angle, profilometry, Fourier transformed infrared spectroscopy‐attenuated total reflectance, x‐ray photoelectron spectroscopy, water stability, swelling tests, and PV. Membranes were treated using dry methods with vacuum ultraviolet (VUV; 162 nm) or ultraviolet (UV)‐C (254 nm) radiation and exposed to O2 or acrylic acid vapors, respectively. The VUV and UV‐C treatments improve PV performances, increasing the water separation selectivity more than 4 and 8.5 times, respectively. UV‐C treatments exhibit a water flux (kg m−2 h−1), selectivity and PSI (kg m−2 h−1) of 0.3, 250, and 87.4 respectively. Highly hydrophilic functional groups grafted onto the surface of the membranes after irradiation favor the selective transfer of water through the membrane. Overall, the VUV or UV‐C membrane treatments show great PV prospect in glycerol dehydration.

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Pervaporation separation of ethyl acetate from aqueous solutions using ZSM-5 filled dual-layer poly(ether-block-amide)/polyethersulfone membrane

Abstract: Dual-layer mixed matrix membranes were prepared by incorporating ZSM-5 zeolite into PEBA as an active layer on the PES membrane as a support layer for pervaporation separation of EAc from the EAc/water mixtures.

Cited by 12 publications

References 58 publications

Polymer/Iron-Based Layered Double Hydroxides as Multifunctional Wound Dressings

Polymer/Iron-Based Layered Double Hydroxides as Multifunctional Wound Dressings

Iron-based Layered Double Hydroxides aiming biomaterials: structure, composition, and polymer composites

Enhanced glycerol dehydration of pervaporation cross‐linkedPVAmembranes modified byVUV/UV‐Ctreatments

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