Superparamagnetic nanoparticles in tap water

Senftle, F.E.; Thorpe, A. N.; Grant, Julius R.; Barkatt, Aaron

doi:10.1016/j.watres.2007.03.035

Cited by 22 publications

(11 citation statements)

References 19 publications

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“…The existence of fine iron oxide particles in tap water were also observed by previous researchers [8,10]. Fine particles within the nano-range (1-100 nm) are normally stable in liquid media as a suspension and normally difficult to be removed by normal filtration process (i.e ultra-filtration and micro-filtration) [11].…”

Section: Introductionmentioning

confidence: 59%

“…The tubercles corrosion consists of a mixture of iron oxides polymorph such as goethite, lepidocrocite, hematite and magnetite [3,4,7]. Turbulence flow that occurs inside the iron pipes causes the tubercles corrosion to spall off into fine particles that are carried away by flowing water [8]. High flow velocity in water pipes will cause fine particles to break into iron oxide of nanoparticles size [9] or commonly noted as fine iron oxide particles.…”

Section: Introductionmentioning

confidence: 99%

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Deposition of fine iron oxide particles in tap water using electrophoretic deposition (EPD) technique

Sharif

Bakar

Naim

2015

Journal of Water Process Engineering

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Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Deposition of fine iron oxide particles in tap water using electrophoretic deposition (EPD) technique

Sharif

Bakar

Naim

2015

Journal of Water Process Engineering

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“…The two kinds of synthesized Fe 3 O 4 spheres of different mean particle sizes were used for treating wastewater containing metal ions such as Ni(II), Cu(II), Cd(II) and Cr(VI). The adsorption capacity of Fe 3 O 4 spheres was found to increase with decreasing particle size or increasing surface area 138. Furthermore, Fe 3 O 4 magnetic nanospheres could also successfully remove phenol and aniline from aqueous solution under acidic and neutral conditions in the presence of H 2 O 2 132.…”

Section: Applications Of Magnetic Nanospheresmentioning

confidence: 93%

“…Some factors including pH, temperature, initial concentration and coexisting common ions influence the adsorption of metal ions 134, 135. Also, based on affinity, mesoporous magnetic iron oxide nanospheres are promising for the effective release of Cr (VI),136 Ni(II),137 Cu(II), Cd(II)138 and 1‐bis(4‐chlorophenyl)‐2,2,2‐trichloroethane (DDT)139 from water in the presence of an external magnetic field. In this case, it is worth mentioning that the affinity plays an important role in ion exchange, and the size and surface of nanospheres affect the effectiveness of the wastewater treatment.…”

Section: Applications Of Magnetic Nanospheresmentioning

confidence: 99%

Recent research progress on the preparation and application of magnetic nanospheres

Tai

Wang

Yan

et al. 2011

Polymer International

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Magnetic nanospheres have numerous applications in biomedicine, biotechnology and wastewater treatment, due to their high surface area, tunable sphere size and superparamagnetic properties. Magnetic nanoparticles can be designed and endowed with optical, electronic and fluorescent properties, allowing a wide range of functionality. Multifunctional magnetic particles with heterodimer structures allow various kinds of target molecules to be attached onto their specific parts via affinity or coordinate bonding, etc. The abilities of these nanodevices, including the encapsulation of target molecules in magnetic hybrid nanostructures and easy magnetic separation in the presence of external magnetic fields, show much promise for magnetic imaging, magnetic separation and drug delivery. Consequently, magnetic particles offer excellent potential future uses in disease diagnosis, hyperthermia, immunoassays, electrochemical biosensors, contaminated water treatment and optical detection. In this article, we review the preparation and application of inorganic and organic magnetic composite spheres in the fields of magnetic separation, drug delivery, hyperthermia, magnetic resonance imaging, and others. The size, specific surface area, structure, magnetic properties and surface functional groups of nanospheres have a great influence on their effectiveness in these applications. The encapsulation of target molecules in magnetic hybrid nanostructures and their easy separation using an external magnetic field show promise for the fabrication of novel nanodevices for many applications.

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“…29 Magnetite is predicted to be cathodic to lead in neutral waters, 30,31 and previous work has identified magnetite in drinking water sampled at the point of use downstream from a corroded iron distribution main. 32,33 Efforts to control drinking water lead often include addition to distributed water of an orthophosphate-based corrosion inhibitor. 34,35 Lead phosphate minerals are relatively insoluble in the neutral pH range and can act as a passivating film, separating lead from the aqueous environment.…”

Section: ■ Introductionmentioning

confidence: 99%

Understanding the Role of Particulate Iron in Lead Release to Drinking Water

Trueman

Gagnon

2016

Environ. Sci. Technol.

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Lead service lines (LSLs) are a major source of drinking water lead, and high iron levels are frequently observed along with elevated lead release. A model distribution system, dosed with orthophosphate, was used to evaluate the effect of corroded iron distribution mains on lead release from recovered LSLs. Lead release was higher by 96 μg L(-1), on average, from LSLs supplied by corroded iron compared to the inert reference material (PVC). This effect may be explained by deposition of semiconducting iron oxide particles within LSLs. When galvanic cells with lead and magnetite (Fe3O4) electrodes were short-circuited, lead release increased 8-fold and a current averaging 26 μA was observed. In effluent from LSLs with an upstream iron main, colloidal lead and iron occurred in the same size fraction-possibly due to release of colloidal particles from LSL corrosion scale enriched with iron. Under these circumstances, high molecular weight (>669 kDa) (208)Pb and (56)Fe elution profiles, observed via size-exclusion chromatography, were highly correlated (average R(2) = 0.97). Increasing orthophosphate from 0.5 to 1.0 mg L(-1) (as PO4(3-)) accompanied an average reduction in lead release of 6 μg L(-1) month(-1) but did not significantly reduce the effect of an upstream iron main.

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Superparamagnetic nanoparticles in tap water

Cited by 22 publications

References 19 publications

Deposition of fine iron oxide particles in tap water using electrophoretic deposition (EPD) technique

Deposition of fine iron oxide particles in tap water using electrophoretic deposition (EPD) technique

Recent research progress on the preparation and application of magnetic nanospheres

Understanding the Role of Particulate Iron in Lead Release to Drinking Water

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