Amit Bhattacharya - Academia.edu (original) (raw)

Papers by Amit Bhattacharya

Radiation Physics and Chemistry, 1997

N-vinyl carbazole (VCZ) has been grafted on a cellulose acetate (CA) matrix by simultaneous irrad... more N-vinyl carbazole (VCZ) has been grafted on a cellulose acetate (CA) matrix by simultaneous irradiation technique using Co-60 γ rays. Two sets of experiments, fluorescence polarization measurements with a grafted VCZ (GVCZ) film and a photo-induced electron transfer (ET) reaction between GVCZ and 1,4-dicyanobenzene (DCB) in tetrahydrofuran (THF), have been performed. Polarization appears in the GVCZ film due to restricted rotational motion of the grafted VCZ on a CA film. ET and the formation of an exciplex between GVCZ and DCB have been observed by steady state and time-resolved fluorescence and laser flash photolysis studies. The dynamics of fluorescence quenching have been evaluated by applying the Stern-Volmer equation. Laser flash photolysis experiments have been able to identify the formation of DCB− at 430 nm due to ET from GVCZ to DCB, which adds a transient polyelectrolyte property to the system.

Journal of Polymer Science Part A: Polymer Chemistry, 1999

... Article. Magnetic field effect on an exciplex between N-vinyl carbazole grafted on cellulose ... more ... Article. Magnetic field effect on an exciplex between N-vinyl carbazole grafted on cellulose acetate film and 1,4-dicyanobenzene. Sanjukta Aich,; Tamal Sengupta,; Amit Bhattacharyya,; Samita Basu. Article first published online: 21 JAN 2000. ...

Journal of surface science and Technology, 2004

Present investigation aims at the studies on the variation of surface tension of a phase inversio... more Present investigation aims at the studies on the variation of surface tension of a phase inversion medium for Polysulfone (PS) membrane having polyvinyl alcohol (PVA) (Mw 14,000) as a surface-active additive in the gelling bath. Dimethyl formamide (DMF) and water are functioning as solvent and non-solvent for PS. The entrapment of PVA during gelling of PS results in a fall in the concentration of PVA in the bulk as well as at the surface which is reflected in the uprising surface tension of the system and the rate of enhancement is dependent upon both the concentration of PS and PSA.

Macromolecular Research, 2008

The pressure driven membrane process has been a breakthrough in the removal of pollutants from dr... more The pressure driven membrane process has been a breakthrough in the removal of pollutants from drinking water. These experiments examined the removal of chlorophenol compounds from water using low pressure membranes. The removal performance of the membranes was based primarily on size exclusion. Apart from size exclusion, the polarity and pKa of the compounds also influences the membrane performance. The molecular size and dipole moments of the respective molecules were calculated using a quantum chemical method. The rejection of pollutants also followed the same trend as salt rejection by the membranes.

International Journal of Biological Macromolecules, 2010

We prepared Polysulfone (PS) globules by pouring the PS solution droplets in to the non-solvent w... more We prepared Polysulfone (PS) globules by pouring the PS solution droplets in to the non-solvent water. PS solutions (10, 15, and 20% (w/v), concentrations) of different viscosities resulted different physical appearances in globules. The lipase immobilizing amount (4.32 mg/g) was maximum for PS 20% globules as it possessed maximum BET pore surface area. The olive oil hydrolytic reaction parameters were fitted into the Lineweaver-Burk plot. The K m (apparent) values of all the immobilized globules were higher (83.3 mM) with respect to free lipases (62.5 mM) where as V max (apparent) values followed the reverse trend (129.8 U/mg for 20% and 120.5 U/mg for both 15% and 10% PS immobilized globules and 153.8 U/mg for the free lipase respectively). The hydrolytic activity to olive oil was decreased (∼16-20%) after five cycles.

Journal of Polymer Research, 2005

This paper is concerned with the cross-linking of poly(vinyl alcohol) (PVA) using maleic acid as ... more This paper is concerned with the cross-linking of poly(vinyl alcohol) (PVA) using maleic acid as the cross-linker. The curative (maleic acid) dose and the curing temperature and time were varied between 2.5 and 60% (w/w), 120 and 160-C and 30 and 120 min, respectively. From a thorough swelling study in both hot and cold water (percentage swelling, gel content, swelling ratio, etc-) the optimum curative dose and curing conditions have been evaluated. The molecular weight between the cross-links exhibited a sharp fall up to a maleic acid dose of 20% (w/w). A comparative evaluation of maleic acid cross-linked and heat-treated PVA films has been done. Better heat stability for maleic acid cross-linked PVA was observed from thermogravimetric analysis. A shift in glass transition temperature was observed for both heat-treated and maleic acid treated PVA compared with the virgin one. IR spectroscopic study indicated the presence of an ester linkage and an olefinic double bond in maleic acid treated and heat-treated PVA films, respectively. Maleic acid crosslinked PVA is quite stable in different polar and nonpolar solvents. A definite structural pattern has been observed in maleic acid cross-linked PVA films through scanning electron microscopy.

Polymer, 1996

Electrochemical synthesis of polypyrrole films containing vinyl sulphonate and styrene sulphonate... more Electrochemical synthesis of polypyrrole films containing vinyl sulphonate and styrene sulphonate dopants were carried out in a three-electrode one-compartment cell employing galvanostatic conditions at constant charge density. Various parameters like current density, dopant concentration, pH and temperature during synthesis were varied for both the dopant anions. Room temperature conductivity for each sample was measured and their surface morphologies were analysed

Journal of Applied Polymer Science, 2008

UV-initiated photomodification by a hydrophilic functional moiety (i.e., acrylic acid) was perfor... more UV-initiated photomodification by a hydrophilic functional moiety (i.e., acrylic acid) was performed in and on a polypiperazineamide thin-film composite membrane. The sequence of the bilayers (i.e., acrylic acid and polypiperazineamide) was altered on a polysulfone membrane. The size exclusion order through the membranes was Atrazine > Simazine > 2,4,6-Trichlorophenol > 2,4-Dichlorophenol according to the molecular size, which was calculated by the quantum mechanical approach. Apart from the molecular size, the polarity and hydrophobicity of the molecules also influenced the separation. The performance of the membranes is based on size exclusion. The membrane with an inner layer of acrylic acid showed more blocking effect than the membrane with the same layer on the top of polypiperazineamide membrane and the unmodified polypiperazineamide membrane.

Separation Science and Technology, 2010

Effectiveness of Bovine Serum Albumin (BSA) as chiral recognizing protein in enantiomers separati... more Effectiveness of Bovine Serum Albumin (BSA) as chiral recognizing protein in enantiomers separation by ultrafiltration technique was studied by immobilizing BSA on the membrane and incorporating BSA as semi-interpenetrating network in the membrane matrix. Separation of racemic tryptophan solution was performed in closed loop cross flow ultrafiltration using BSA immobilized polysulfone membrane and polysulfone membrane having BSA semi-IPN network. The volumetric flux (Jv), the solute flux (Js), the separation factor (α), and the enantiomeric excess (%ee) of two types of membranes at different trans-membrane pressures and permeation times were determined. BSA semi-IPN membrane exhibits higher volumetric as well as solute fluxes compared to BSA immobilized membrane. Separation factor (α) to the order of 1.89 was achieved with BSA immobilized membrane after 8 h of ultrafiltration and in the same duration BSA-IPN membrane exhibited separation factor (α) to the order of 1.62. BSA immobilized membrane exhibits higher enantiomeric excess (30.8%) compared to BSA semi-IPN membrane (23.8%) after 8 hrs. BSA molecules available on membrane as immobilized or as semi-IPN under go complexion with tryptophan enantiomers differently. BSA immobilized membrane performed better separation and enantiomeric purity; however, the solute flux of the membrane decreases.

Journal of Environmental Chemical Engineering, 2015

ABSTRACT Hydrophobicity and binding energy from density functional theory studies were investigat... more ABSTRACT Hydrophobicity and binding energy from density functional theory studies were investigated for catechol and resorcinol to explain a greater degree separation through polyamide thin film composite membranes. The effects of nature of base polymer matrices were well explained by casting the membranes from polysulfone 14% (w/w) and polyether sulfone 20% (w/w) separately having same viscosity. Concentration gradient of the two polymers could not supersede the basic material property of membranes. The separation behaviour of catechol and resorcinol through thin film composite based on said polymers, it was demonstrated that thin film composite based on polysulfone is relatively more effective in terms of better separation performances of catechol (Rcatechol 96.5%, Jv 27.2 L/m2h and Rresorcinol 84.9%, Jv 27.3 L/m2h). The effect of pH on separation performances due to variation of zeta potential was revealed to be an important factor governing the performances of membranes. The separation of organics by both thin film composite membranes is lower in acidic medium (viz. catechol 5.1% and resorcinol 6.8% for thin film composite on polysulfone membrane) compared to neutral medium because of the induced positive charge of terminal pendant amino groups on membrane surface. Presence of di-cation (Mg2+) in solution affects the membrane behaviour and influencing positively the resorcinol rejection. The separation of organics for both thin film composite membranes is higher (viz. catechol 11.2% and resorcinol 1.6%, 800 mg/L MgSO4 for thin film composite based on polysulfone membrane) compared to feed without MgSO4 because of the adsorption of Mg2+ ion on membrane surface.

Journal of Surface Science and Technology

Present investigation aims at the studies on the variation of surface tension of a phase inversio... more Present investigation aims at the studies on the variation of surface tension of a phase inversion medium for Polysulfone (PSf) membrane having polyvinyl alcohol (PVA) (Mw 14,000) as a surface-active additive in the gelling bath. Dimethyl formamide (DMF) and water are functioning as solvent and non-solvent for PSf. The entrapment of PVA during gelling of PSf results in a fall in the concentration of PVA in the bulk as well as at the surface which is reflected in the uprising surface tension of the system and the rate of enhancement is dependent upon both the concentration of PSf and PVA. © 2004 Indian Society for Surface Science and Technology.

Journal of Macromolecular Science, Part A, 2008

and-conditions-of-access.pdf This article may be used for research, teaching and private study pu... more and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, redistribution , reselling , loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

Pesticides are the man-made creation to protect the crops and household items. Too often running ... more Pesticides are the man-made creation to protect the crops and household items. Too often running water can become insidiously polluted by pesticides. In this review, the possible paths in which water can be contaminated by pesticides are exposed. There are several techniques for water remediation. Membrane separation technique has its potentiality and is an advantageous technique amongst all. The performances of some commercial membranes in pesticides separation from water are enlisted. Factors such as the nature of membranes, nature of pesticides, presence of organic and inorganic matters, temperature and/or pH influence the pesticide separation are discussed.

Sociedad Química de México, Jun 1, 2008

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourira... more Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

Separation Science and Technology, 2010

and-conditions-of-access.pdf This article may be used for research, teaching and private study pu... more and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, redistribution , reselling , loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourira... more Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

Journal of the Mexican Chemical Society

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb–Sourira... more Polysulfone membranes are prepared through phase separation technique, introduced by Loeb–Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

International Journal of Environmental Engineering, 2010

ABSTRACT

Radiation Physics and Chemistry, 1997

N-vinyl carbazole (VCZ) has been grafted on a cellulose acetate (CA) matrix by simultaneous irrad... more N-vinyl carbazole (VCZ) has been grafted on a cellulose acetate (CA) matrix by simultaneous irradiation technique using Co-60 γ rays. Two sets of experiments, fluorescence polarization measurements with a grafted VCZ (GVCZ) film and a photo-induced electron transfer (ET) reaction between GVCZ and 1,4-dicyanobenzene (DCB) in tetrahydrofuran (THF), have been performed. Polarization appears in the GVCZ film due to restricted rotational motion of the grafted VCZ on a CA film. ET and the formation of an exciplex between GVCZ and DCB have been observed by steady state and time-resolved fluorescence and laser flash photolysis studies. The dynamics of fluorescence quenching have been evaluated by applying the Stern-Volmer equation. Laser flash photolysis experiments have been able to identify the formation of DCB− at 430 nm due to ET from GVCZ to DCB, which adds a transient polyelectrolyte property to the system.

Journal of Polymer Science Part A: Polymer Chemistry, 1999

... Article. Magnetic field effect on an exciplex between N-vinyl carbazole grafted on cellulose ... more ... Article. Magnetic field effect on an exciplex between N-vinyl carbazole grafted on cellulose acetate film and 1,4-dicyanobenzene. Sanjukta Aich,; Tamal Sengupta,; Amit Bhattacharyya,; Samita Basu. Article first published online: 21 JAN 2000. ...

Journal of surface science and Technology, 2004

Present investigation aims at the studies on the variation of surface tension of a phase inversio... more Present investigation aims at the studies on the variation of surface tension of a phase inversion medium for Polysulfone (PS) membrane having polyvinyl alcohol (PVA) (Mw 14,000) as a surface-active additive in the gelling bath. Dimethyl formamide (DMF) and water are functioning as solvent and non-solvent for PS. The entrapment of PVA during gelling of PS results in a fall in the concentration of PVA in the bulk as well as at the surface which is reflected in the uprising surface tension of the system and the rate of enhancement is dependent upon both the concentration of PS and PSA.

Macromolecular Research, 2008

The pressure driven membrane process has been a breakthrough in the removal of pollutants from dr... more The pressure driven membrane process has been a breakthrough in the removal of pollutants from drinking water. These experiments examined the removal of chlorophenol compounds from water using low pressure membranes. The removal performance of the membranes was based primarily on size exclusion. Apart from size exclusion, the polarity and pKa of the compounds also influences the membrane performance. The molecular size and dipole moments of the respective molecules were calculated using a quantum chemical method. The rejection of pollutants also followed the same trend as salt rejection by the membranes.

International Journal of Biological Macromolecules, 2010

We prepared Polysulfone (PS) globules by pouring the PS solution droplets in to the non-solvent w... more We prepared Polysulfone (PS) globules by pouring the PS solution droplets in to the non-solvent water. PS solutions (10, 15, and 20% (w/v), concentrations) of different viscosities resulted different physical appearances in globules. The lipase immobilizing amount (4.32 mg/g) was maximum for PS 20% globules as it possessed maximum BET pore surface area. The olive oil hydrolytic reaction parameters were fitted into the Lineweaver-Burk plot. The K m (apparent) values of all the immobilized globules were higher (83.3 mM) with respect to free lipases (62.5 mM) where as V max (apparent) values followed the reverse trend (129.8 U/mg for 20% and 120.5 U/mg for both 15% and 10% PS immobilized globules and 153.8 U/mg for the free lipase respectively). The hydrolytic activity to olive oil was decreased (∼16-20%) after five cycles.

Journal of Polymer Research, 2005

This paper is concerned with the cross-linking of poly(vinyl alcohol) (PVA) using maleic acid as ... more This paper is concerned with the cross-linking of poly(vinyl alcohol) (PVA) using maleic acid as the cross-linker. The curative (maleic acid) dose and the curing temperature and time were varied between 2.5 and 60% (w/w), 120 and 160-C and 30 and 120 min, respectively. From a thorough swelling study in both hot and cold water (percentage swelling, gel content, swelling ratio, etc-) the optimum curative dose and curing conditions have been evaluated. The molecular weight between the cross-links exhibited a sharp fall up to a maleic acid dose of 20% (w/w). A comparative evaluation of maleic acid cross-linked and heat-treated PVA films has been done. Better heat stability for maleic acid cross-linked PVA was observed from thermogravimetric analysis. A shift in glass transition temperature was observed for both heat-treated and maleic acid treated PVA compared with the virgin one. IR spectroscopic study indicated the presence of an ester linkage and an olefinic double bond in maleic acid treated and heat-treated PVA films, respectively. Maleic acid crosslinked PVA is quite stable in different polar and nonpolar solvents. A definite structural pattern has been observed in maleic acid cross-linked PVA films through scanning electron microscopy.

Polymer, 1996

Electrochemical synthesis of polypyrrole films containing vinyl sulphonate and styrene sulphonate... more Electrochemical synthesis of polypyrrole films containing vinyl sulphonate and styrene sulphonate dopants were carried out in a three-electrode one-compartment cell employing galvanostatic conditions at constant charge density. Various parameters like current density, dopant concentration, pH and temperature during synthesis were varied for both the dopant anions. Room temperature conductivity for each sample was measured and their surface morphologies were analysed

Journal of Applied Polymer Science, 2008

UV-initiated photomodification by a hydrophilic functional moiety (i.e., acrylic acid) was perfor... more UV-initiated photomodification by a hydrophilic functional moiety (i.e., acrylic acid) was performed in and on a polypiperazineamide thin-film composite membrane. The sequence of the bilayers (i.e., acrylic acid and polypiperazineamide) was altered on a polysulfone membrane. The size exclusion order through the membranes was Atrazine > Simazine > 2,4,6-Trichlorophenol > 2,4-Dichlorophenol according to the molecular size, which was calculated by the quantum mechanical approach. Apart from the molecular size, the polarity and hydrophobicity of the molecules also influenced the separation. The performance of the membranes is based on size exclusion. The membrane with an inner layer of acrylic acid showed more blocking effect than the membrane with the same layer on the top of polypiperazineamide membrane and the unmodified polypiperazineamide membrane.

Separation Science and Technology, 2010

Effectiveness of Bovine Serum Albumin (BSA) as chiral recognizing protein in enantiomers separati... more Effectiveness of Bovine Serum Albumin (BSA) as chiral recognizing protein in enantiomers separation by ultrafiltration technique was studied by immobilizing BSA on the membrane and incorporating BSA as semi-interpenetrating network in the membrane matrix. Separation of racemic tryptophan solution was performed in closed loop cross flow ultrafiltration using BSA immobilized polysulfone membrane and polysulfone membrane having BSA semi-IPN network. The volumetric flux (Jv), the solute flux (Js), the separation factor (α), and the enantiomeric excess (%ee) of two types of membranes at different trans-membrane pressures and permeation times were determined. BSA semi-IPN membrane exhibits higher volumetric as well as solute fluxes compared to BSA immobilized membrane. Separation factor (α) to the order of 1.89 was achieved with BSA immobilized membrane after 8 h of ultrafiltration and in the same duration BSA-IPN membrane exhibited separation factor (α) to the order of 1.62. BSA immobilized membrane exhibits higher enantiomeric excess (30.8%) compared to BSA semi-IPN membrane (23.8%) after 8 hrs. BSA molecules available on membrane as immobilized or as semi-IPN under go complexion with tryptophan enantiomers differently. BSA immobilized membrane performed better separation and enantiomeric purity; however, the solute flux of the membrane decreases.

Journal of Environmental Chemical Engineering, 2015

ABSTRACT Hydrophobicity and binding energy from density functional theory studies were investigat... more ABSTRACT Hydrophobicity and binding energy from density functional theory studies were investigated for catechol and resorcinol to explain a greater degree separation through polyamide thin film composite membranes. The effects of nature of base polymer matrices were well explained by casting the membranes from polysulfone 14% (w/w) and polyether sulfone 20% (w/w) separately having same viscosity. Concentration gradient of the two polymers could not supersede the basic material property of membranes. The separation behaviour of catechol and resorcinol through thin film composite based on said polymers, it was demonstrated that thin film composite based on polysulfone is relatively more effective in terms of better separation performances of catechol (Rcatechol 96.5%, Jv 27.2 L/m2h and Rresorcinol 84.9%, Jv 27.3 L/m2h). The effect of pH on separation performances due to variation of zeta potential was revealed to be an important factor governing the performances of membranes. The separation of organics by both thin film composite membranes is lower in acidic medium (viz. catechol 5.1% and resorcinol 6.8% for thin film composite on polysulfone membrane) compared to neutral medium because of the induced positive charge of terminal pendant amino groups on membrane surface. Presence of di-cation (Mg2+) in solution affects the membrane behaviour and influencing positively the resorcinol rejection. The separation of organics for both thin film composite membranes is higher (viz. catechol 11.2% and resorcinol 1.6%, 800 mg/L MgSO4 for thin film composite based on polysulfone membrane) compared to feed without MgSO4 because of the adsorption of Mg2+ ion on membrane surface.

Journal of Surface Science and Technology

Present investigation aims at the studies on the variation of surface tension of a phase inversio... more Present investigation aims at the studies on the variation of surface tension of a phase inversion medium for Polysulfone (PSf) membrane having polyvinyl alcohol (PVA) (Mw 14,000) as a surface-active additive in the gelling bath. Dimethyl formamide (DMF) and water are functioning as solvent and non-solvent for PSf. The entrapment of PVA during gelling of PSf results in a fall in the concentration of PVA in the bulk as well as at the surface which is reflected in the uprising surface tension of the system and the rate of enhancement is dependent upon both the concentration of PSf and PVA. © 2004 Indian Society for Surface Science and Technology.

Journal of Macromolecular Science, Part A, 2008

and-conditions-of-access.pdf This article may be used for research, teaching and private study pu... more and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, redistribution , reselling , loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

Pesticides are the man-made creation to protect the crops and household items. Too often running ... more Pesticides are the man-made creation to protect the crops and household items. Too often running water can become insidiously polluted by pesticides. In this review, the possible paths in which water can be contaminated by pesticides are exposed. There are several techniques for water remediation. Membrane separation technique has its potentiality and is an advantageous technique amongst all. The performances of some commercial membranes in pesticides separation from water are enlisted. Factors such as the nature of membranes, nature of pesticides, presence of organic and inorganic matters, temperature and/or pH influence the pesticide separation are discussed.

Sociedad Química de México, Jun 1, 2008

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourira... more Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

Separation Science and Technology, 2010

and-conditions-of-access.pdf This article may be used for research, teaching and private study pu... more and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, redistribution , reselling , loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourira... more Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

Journal of the Mexican Chemical Society

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb–Sourira... more Polysulfone membranes are prepared through phase separation technique, introduced by Loeb–Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

International Journal of Environmental Engineering, 2010

ABSTRACT