Ultrafiltration membranes — characterization methods

Capannelli, G.; Vigo, F.; Munari, S.

doi:10.1016/s0376-7388(00)82305-4

Cited by 137 publications

(50 citation statements)

References 11 publications

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“…The NaOH treated membrane was washed several times with water and stored in water for 24 h before surface crosslinking. Since the mode pore size of PAN base membrane, determined by combined bubble point-solvent permeability method [11], was in the UF range (2 ×10 − 8 m), it is likely that chitosan chains might have penetrated into the pores of PAN base membrane.…”

Section: Preparation Of Chitosan/pan Composite Nf Membranes (Panchinf)mentioning

confidence: 99%

Effects of surface crosslinking on sieving characteristics of chitosan/poly(acrylonitrile) composite nanofiltration membranes

Musale

Kumar

2000

Separation and Purification Technology

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Effects of surface crosslinking of chitosan/poly(acrylonitrile) (PAN) composite nanofiltration membranes at different crosslinker (glutaraldehyde) concentrations and crosslinking times on their surface chemical composition and sieving properties such as pure water permeation, molecular weight cut-off and the rejection of mono/divalent salts and mono/oligosaccharides were investigated. Fourier transform infrared-attenuated total reflectance spectroscopy (FTIR-ATRS) and X-ray photoelectron spectroscopy (XPS) studies revealed the crosslinking of chitosan with glutaraldehyde as well as variations in chemical composition with glutaraldehyde concentration and crosslinking time. Pure water permeation/swelling in water decreased and rejection of salts and sugars increased with increasing glutaraldehyde concentration, indicating pore contraction and increase in hydrophobicity as well as pore tortuosity due to crosslinking. Molecular weight cut-offs of surface crosslinked membranes were in the range of 550 -700 Da, a characteristic of nanofiltration membranes, whereas uncrosslinked membrane had cut-off of \ 1500 Da. The crosslinked membranes were found to be stable over 10-h operation for pure water permeation and the stability increased with increasing glutaraldehyde concentration.

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Section: Preparation Of Chitosan/pan Composite Nf Membranes (Panchinf)mentioning

confidence: 99%

Effects of surface crosslinking on sieving characteristics of chitosan/poly(acrylonitrile) composite nanofiltration membranes

Musale

Kumar

2000

Separation and Purification Technology

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“…The pore size distribution of ultrafiltration membranes could be determined by a modified bubble-point method described by Capannelli et al (1983). In brief, water saturated i-butanol was used to displace water in pre-wetted membranes with a constant increment of pressure.…”

Section: Ultrafiltrationmentioning

confidence: 99%

Fundamentals of Membrane Processes

Kumar¹

2012

Membrane Technology and Environmental Applications

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“…As membranas do tipo porosas apresentam poros semelhantes a um cone, cujo diâmetro aumenta de forma gradual em sua seção transversal [12]. A região superior da membrana (2% de sua espessura global), que está em contato com a solução a ser separada, pode ou não apresentar poros muito pequenos (< 0,05 µm), o que interfere na seletividade [1].…”

Section: Introductionunclassified

Caracterização no Infravermelho (IV) e Eletrônica de superfície (MEV) de membranas assimétricas à base de Poli (acrilonitrila-co-acetato de vinila)

2017

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RESUMO As membranas assimétricas, denominadas respectivamente Mb1 e Mb2, foram obtidas por meio do método de inversão de fases, empregando-se o copolímero Poli (acrilonitrila-co-acetato de vinila) - P (AN- co -AV) com composição em massa inicial de 6,5% e 8,5% de Polivinilpirrolidona (PVP). As membranas foram caracterizadas por meio das técnicas de Espectroscopia no Infravermelho com Transformada de Fourier (IV-TF) e de Microscopia Eletrônica de Varredura (MEV). Por meio da técnica de IV-TF foi possível identificar as bandas que permitiram apontar os principais grupos funcionais presentes: i) no polímero base, ii) no copolímero e iii) no aditivo polimérico PVP usados na fabricação das membranas. Tais bandas seriam: em 2246 cm-1, banda associada à deformação axial do grupo C≡N da unidade de acrilonitrila; em 1735 cm-1, banda associada ao estiramento do grupo carbonila (C=O), presente no comonômero éster ou ácidos utilizados na polimerização da Poliacrilonitrila (PAN), e em 1242 cm-1 (νC-O), banda associada aos grupos acetatos presentes no copolímero P(AN-co-AV). As bandas fundamentais da PVP foram identificadas em 1664 cm-1 e 1293 cm-1 atribuída ao estiramento do grupo carbonila (C=O) ligado à amida e ao estiramento da ligação (-C-N) respectivamente. Os resultados obtidos por meio da MEV apontaram para alterações estruturais na morfologia da membrana resultantes do aumento na concentração de PVP.

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Ultrafiltration membranes — characterization methods

Cited by 137 publications

References 11 publications

Effects of surface crosslinking on sieving characteristics of chitosan/poly(acrylonitrile) composite nanofiltration membranes

Effects of surface crosslinking on sieving characteristics of chitosan/poly(acrylonitrile) composite nanofiltration membranes

Fundamentals of Membrane Processes

Caracterização no Infravermelho (IV) e Eletrônica de superfície (MEV) de membranas assimétricas à base de Poli (acrilonitrila-co-acetato de vinila)

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