Removal of triazines from water using a novel OA modified SiO 2 /PA/PSf nanocomposite membrane

Rakhshan, Nasim; Pakizeh, Majid

doi:10.1016/j.seppur.2015.04.013

Cited by 44 publications

(18 citation statements)

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“…The dipole moment for dimethoate is 5.164 D, while the dipole moment for atrazine is 1.763 D . Molecules with a larger dipole moment will be electrostatically oriented towards the membrane pores when they approach a charged membrane . Accordingly, they are easier to enter into the membrane structure , .…”

Section: Resultsmentioning

confidence: 99%

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Impact of Solute Properties and Water Matrix on Nanofiltration of Pesticides

et al. 2019

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The application of different nanofiltration membranes for the separation of pesticides, i.e., atrazine and dimethoate, from aqueous solutions is described. The nanoflitration membranes DK, NF270, NF200, and NF90 were tested for the pesticide retention performance in a stirred dead-end filtration system. NF90 demonstrated the best pesticide retention with over 95 % for atrazine and approximately 80 % for dimethoate. All membranes consistently showed better retention of atrazine than of dimethoate. Dissolving the pesticides in river or tap water amplified the overall pesticide retention performance, indicating that filtration in water treatment plants could render superior pesticide retention. However, a lower flux was obtained for the filtration of tap and river water.

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Section: Resultsmentioning

confidence: 99%

“…Molecules with a larger dipole moment will be electrostatically oriented towards the membrane pores when they approach a charged membrane . Accordingly, they are easier to enter into the membrane structure , . Consequently, they will be less rejected .…”

Section: Resultsmentioning

confidence: 99%

Impact of Solute Properties and Water Matrix on Nanofiltration of Pesticides

et al. 2019

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“…pH affects pesticide retention due to membrane surface functional groups dissociation (Karabelas and Plakas, 2011), where the higher ionic content leads to an increase in triazine rejection due to ion adsorption on the membrane, which narrows the membrane pore size, as indicated by an increase in membrane zeta potential (Madsen and Søgaard, 2014). The triazine rejection increases as the feed concentration increases (Musbah et al, 2013;Pakizeh, 2015, 2016), probably due to pesticide adsorption onto the membrane surface (Rakhshan and Pakizeh, 2015). Research on the presence of organic matter in water and its influence on triazine rejection by NF90, NF270 and XLE membrane, conducted by Karabelas (2009, 2011) revealed several important facts.…”

Section: The Role Of Feed-water Compositionmentioning

confidence: 99%

Application of membrane technology in the treatment and analysis of triazine pesticides in water

Branković

Bojić

Anđelković

et al. 2018

Facta Univ Phys Chem Technol

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The quality of consumable water is decreasing due to increasing water pollution caused by the production and use of human-made chemicals. A significant part of these chemicals are pesticides from the class of triazines since they are widely used in agriculture as herbicides. Water treatment techniques mainly rely on separation science, where the membrane technology has been identified as the most useful. Membrane processes used in water treatment are microfiltration, ultrafiltration, nanofiltration and reverse osmosis. In general, the pollutant retention/rejection by membranes depends on the physicochemical properties of the membrane i.e. membrane material, porosity, pore size and on the properties of the pollutant molecule i.e. size, length, width, molecular weight, hydrophobicity or dipole moment. The pollutant retention also depends on the feed-water composition (organic matter and salt presence, solute concentration, water pH). Thus, effective water treatment depends on the selection of an appropriate type of membrane for a particular type of pollutants. Membrane technology is also significant because it is used in polluted water analysis, more precise as a part of a liquid-phase or solid-phase microextraction. Among several developed membrane-based microextraction methods, in triazine polluted water analysis common are membrane-protected solid-phase microextraction and hollow-fiber liquid-phase microextraction. In this field, researchers tend to achieve membrane-pollutant compatibility through the synthesis of polymeric materials with molecular recognition properties i.e. through a technology called molecular imprinting.

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“…However, they easily aggregate due to the large specific surface area and rich surface hydroxyl groups, which results in their uneven dispersion in systems and then affects their use . In order to improve the dispersity and stability of SiO 2 nanoparticles, methods of adding surfactant or grafting silane coupling agent or polymer on the surface of the particles are usually used . However, these studies mainly focus on improving the dispersity of SiO 2 nanoparticles in organic solvents or polymer matrices; moreover, the nano‐SiO 2 content in these systems is very low.…”

Section: Introductionmentioning

confidence: 99%

Photopolymerization synthesis of polyacrylic acid dispersant with methoxysilicon end groups and its application in a nano‐SiO₂ aqueous system

Zhou

et al. 2018

Polymer International

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In order to improve the dispersity and stability of the nano‐SiO2 aqueous system with high solid content, a kind of polyacrylic acid dispersant with methoxysilicon end groups (KH590‐PAA) was synthesized by photopolymerization of acrylic acid (AA) initiated with (3‐mercaptopropyl)trimethoxysilane (KH590). After adding KH590‐PAA into the nano‐SiO2 aqueous dispersion system (20 wt% solid content), the viscosity and the curing time of the system were measured with a rotational viscometer and the inverted bottle method. Moreover, the dispersion mechanism of KH590‐PAA for the nano‐SiO2 aqueous system was researched by measuring the adsorption capacity, the particle size and the zeta potential of the nanoparticles with a conductivity meter, dynamic light scattering, SEM and TEM, respectively. The results showed that the methoxysilicon groups in KH590‐PAA could react with hydroxyl groups on the surface of nano‐SiO2 in the process of stirring, which enhanced the adsorption capacity of the dispersant and then increased the surface charge of the particles. Therefore, electrostatic repulsion and steric hindrance effects between the SiO2 nanoparticles could be further enhanced by adding the KH590‐PAA dispersant, and then the nano‐SiO2 aqueous system exhibited better dispersity and stability. Besides, the dispersion properties of SiO2 nanoparticles in water were closely related to the addition amount and the molecular weight of the KH590‐PAA dispersant. © 2018 Society of Chemical Industry

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Removal of triazines from water using a novel OA modified SiO 2 /PA/PSf nanocomposite membrane

Cited by 44 publications

References 50 publications

Impact of Solute Properties and Water Matrix on Nanofiltration of Pesticides

Impact of Solute Properties and Water Matrix on Nanofiltration of Pesticides

Application of membrane technology in the treatment and analysis of triazine pesticides in water

Photopolymerization synthesis of polyacrylic acid dispersant with methoxysilicon end groups and its application in a nano‐SiO₂ aqueous system

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Removal of triazines from water using a novel OA modified SiO 2 /PA/PSf nanocomposite membrane

Cited by 44 publications

References 50 publications

Impact of Solute Properties and Water Matrix on Nanofiltration of Pesticides

Impact of Solute Properties and Water Matrix on Nanofiltration of Pesticides

Application of membrane technology in the treatment and analysis of triazine pesticides in water

Photopolymerization synthesis of polyacrylic acid dispersant with methoxysilicon end groups and its application in a nano‐SiO2 aqueous system

Contact Info

Product

Resources

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Photopolymerization synthesis of polyacrylic acid dispersant with methoxysilicon end groups and its application in a nano‐SiO₂ aqueous system