Reverse osmosis rejection by hydrous inorganic precipitate–cellulose composite membrane

Kurokawa, Yasuyoshi; Ueno, K.

doi:10.1002/app.1982.070270224

Cited by 24 publications

(6 citation statements)

References 12 publications

(4 reference statements)

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“…[1][2][3][4][5][6][7][8][9][10] When inorganic metal oxides are used, the resulting materials, Cel/M x O y , can be useful for specific applications, i.e., Cel/TiO 2 for enzyme immobilization and preconcen- 17 These hybrid materials are normally made by means of mixing the cellulose acetate and the metal oxide precursor solutions, followed by a phase inversion process. 10,18 Zirconium phosphate type cation exchangers have been extensively studied and are well-known for their excellence as ion exchangers.…”

Section: Introductionmentioning

confidence: 99%

The ion exchange properties and equilibrium constants of Li+, Na+ and K+ on zirconium phosphate highly dispersed on a cellulose acetate fibers surface

Borgo¹,

Lazarin²,

Kholin

et al. 2004

J. Braz. Chem. Soc.

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Fosfato de zircônio altamente disperso foi preparado reagindo acetato de celulose/ZrO 2 (ZrO 2 = 11 wt%, 1,0 mmol g -1 de átomo de zircônio por grama de material) com ácido fosfórico. Highly dispersed zirconium phosphate was prepared by reacting celullose acetate/ZrO 2 (ZrO 2 = 11 wt%, 1.0 mmol g -1 of zirconium atom per gram of the material) with phosphoric acid. High power decoupling magic angle spinning (HPDEC-MAS) 31 P NMR and X-ray photoelectron spectroscopy data indicated that HPO 4 2-is the species present on the membrane surface. The specific concentration of acidic centers, determined by ammonia gas adsorption, is 0.60 mmol g The high values of the separation factors S Na + /Li + and S K + /Li + (up to several hundreds) support the application of this material for the quantitative separation of Na + and K + from Li + from a mixture containing these three ions.

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Section: Introductionmentioning

confidence: 99%

The ion exchange properties and equilibrium constants of Li+, Na+ and K+ on zirconium phosphate highly dispersed on a cellulose acetate fibers surface

Borgo¹,

Lazarin²,

Kholin

et al. 2004

J. Braz. Chem. Soc.

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“…When inorganic metal oxides are used, the resulting flask was purged with nitrogen until no HCl could be dematerials can be useful in ion-exchange process (3), as sup-tected in the syrup. The test for Cl 0 was carried out by ports for enzymes (4-7), in catalytic reactions (8), and in adding AgNO 3 solution to a sample taken from the syrup reverse osmosis experiments (9). These hybrid composite and diluted with 0.1 M HNO 3 solution.…”

Section: Introductionmentioning

confidence: 99%

Composite Membrane of Niobium(V) Oxide and Cellulose Acetate: Preparation and Characterization

Campos

Gushikem

1997

Journal of Colloid and Interface Science

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“…[9][10][11][12] Numerous chemical modifications in cellulosic matrices with highly dispersed metal oxides have been reported in recent years. 8,[13][14][15][16][17][18][19][20][21][22][23] The preparation of chemically modified electrodes with films or fibers of polymers and metal oxides has attracted considerable interest for immobilization of electroactives species due to their excellent electron transfer properties. An important class of organic compounds with interesting electrochemical properties, redox behaviour and possibility of immobilization by means of an ion exchange process in these host matrices is constituted by phenothiazines like methylene blue (MB).…”

Section: Introductionmentioning

confidence: 99%

Methylene blue immobilized on cellulose acetate with titanium dioxide: an application as sensor for ascorbic acid

Hoffmann¹,

Dias²,

Rodrigues³

et al. 2008

J. Braz. Chem. Soc.

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Neste trabalho, o corante azul de metileno foi imobilizado na superfície do acetato de celulose modificado com dióxido de titânio produzindo um material híbrido sólido denominado de CA-TiO 2 MB. O experimento produziu uma quantidade de 1,8 mmol g -1 de TiO 2 incorporado no acetato de celulose e uma quantidade de 0,170 0,005 mmol g -1 de azul de metileno adsorvido na superfície do CA-TiO 2 . Um eletrodo de pasta de carbono desse material foi usado para estudar a oxidação eletrocatalítica do ácido ascórbico pelas técnicas de voltametria cíclica e cronoamperometria. O pH da solução não afetou o potencial de pico de anódico nem a corrente de pico anódico ao variar de 3,0 a 7,0. A oxidação do analito ocorreu em 75 mV versus ECS em solução de KCl 1,0 mol L -1 e pH 7,0. A intensidade da corrente de pico anódico variou com a concentração de ácido ascórbico na faixa de 5,0 10 -4 mol L -1 to 4,5 10 -3 mol L . A resposta do eletrodo foi muito rápida, com um tempo decorrido de 1,0 s, mostrando potencial para ser utilizado como um sensor eletroquímico para a determinação de ácido ascórbico em produtos comerciais.In this work, methylene blue dye was immobilized on the surface of cellulose acetate modified with titanium dioxide, producing a solid hybrid material designated as CA-TiO 2 MB. The experiment yielded an amount of 1.8 mmol g -1 of TiO 2 incorporated in the cellulose acetate and an amount of 0.170 0.005 mmol g -1 of methylene blue adsorbed onto CA-TiO 2 surface. A carbon paste electrode of this material was used to study the electrocatalytic oxidation of ascorbic acid by cyclic voltammetric and chronoamperometric techniques. The pH of the solution had no effect on the anodic peak potential and anodic peak current when ranging from 3.0 to 7.0. The oxidation of the analyte occurred at 75 mV versus SCE in 1.0 mol L -1 KCl solution and pH 7.0. The intensity of the anodic peak current varied with the concentration of ascorbic acid from 5.0 10 -4 mol L -1 to 4.5 10 -3 mol L -1 and a linear correlation was observed, with a detection limit of 15 µmol L -1 , quantification limit of 50 µmol L -1 and a sensitivity of 7.1 µA L mol -1. The electrode response was very fast, with an elapsed time of about 1.0 s, showing the potentiality to be utilized as an electrochemical sensor for determination of ascorbic acid in commercial samples.Keywords: methylene blue, modified cellulose acetate, titanium dioxide, carbon paste electrode, ascorbic acid IntroductionThe development of sensors that allow the measurements of some analyte, which presents analytical or environmental interest, has continued to be of major concern during the past two decades. They use as electrochemical mediator species makes possible the attempt to exert more control over the chemical nature of an electrode and to attain the selectivity of electrochemical measurements. This development has helped the measurement of important analytes in medicine, pharmacy, manufactured food and other areas. The most common material that is usually employed as an inert support for th...

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Reverse osmosis rejection by hydrous inorganic precipitate–cellulose composite membrane

Cited by 24 publications

References 12 publications

The ion exchange properties and equilibrium constants of Li+, Na+ and K+ on zirconium phosphate highly dispersed on a cellulose acetate fibers surface

The ion exchange properties and equilibrium constants of Li+, Na+ and K+ on zirconium phosphate highly dispersed on a cellulose acetate fibers surface

Composite Membrane of Niobium(V) Oxide and Cellulose Acetate: Preparation and Characterization

Methylene blue immobilized on cellulose acetate with titanium dioxide: an application as sensor for ascorbic acid

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