Optimizing magnetic nanoparticles for drinking water technology: The case of Cr(VI)

Simeonidis, K.; Kaprara, Efthimia; Samaras, Theodoros; Angelakeris, M.; Pliatsikas, N.; Vourlias, G.; Mitrakas, Manassis; Andritsos, N.

doi:10.1016/j.scitotenv.2015.04.033

Cited by 70 publications

(39 citation statements)

References 29 publications

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“…Moreover, it was reported that electrons can transfer from the Fe 2+ (located in the core of Fe 3 O 4 MNPs) to Cr(VI). This resulting in the reduction of Cr(VI) which can precipitate as insoluble Cr(III) hydroxide on the magnetite surface [39]. Free radical electrons can be formed due to the magnetic field generated by MNPs around themselves.…”

Section: Discussionmentioning

confidence: 99%

Applications of CTAB modified magnetic nanoparticles for removal of chromium (VI) from contaminated water

Elfeky

Mahmoud

Youssef

2017

Journal of Advanced Research

169

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Section: Discussionmentioning

confidence: 99%

Applications of CTAB modified magnetic nanoparticles for removal of chromium (VI) from contaminated water

Elfeky

Mahmoud

Youssef

2017

Journal of Advanced Research

169

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“…1). 127 Results indicate that magnetite nanoparticles may combine sufficient cost, chemical stability, improved Cr(VI) reduction ability and environmental safety after use. 79 The mechanisms of adsorption under various pH conditions, the gradual modification of ZVI during the process and the possible interferences have been reported separately for As(III) and As(V).…”

Section: Removal Of Heavy Metalsmentioning

confidence: 96%

“…In addition, in order to ensure their complete separation from treated water an expensive filtration step of nanofiltration should be included. 127 For this reason, ZVI and iron oxide nanoparticles are preferred to be used individually or as substrates for other active phases. Coagulating agents can influence the stability of nanoparticles through the production of charged hydrolytic species that neutralize surface charges on nanoparticles.…”

Section: Fate Of Used Nanoparticlesmentioning

confidence: 99%

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Inorganic engineered nanoparticles in drinking water treatment: a critical review

Simeonidis

Mourdikoudis

Kaprara

et al. 2016

Environ. Sci.: Water Res. Technol.

177

103

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The interest of the scientific community in the potential applications of inorganic engineered nanoparticles for drinking water treatment is continuously increasing. This review paper is an up to date summary of recent research progress in this field with respect to the removal of heavy metals, microorganisms and organic pollutants. In parallel, a critical investigation on the applicability of developed nanomaterials is attempted, considering the economic viability, environmental safety and sustainability of proposed processes. On this, the manuscript discusses issues like the stability and fate of engineered nanoparticles during and after use whereas it suggests a generalized approach for excluding reliable and comparable results by laboratory experiments. AbstractThis review summarizes recent research in the field of inorganic engineered nanoparticles development with direct or potential interest for drinking water treatment. The incorporation of engineered nanoparticles in drinking water treatment technologies against the removal of heavy metals, microorganisms and organic pollutants appears as a very dynamic branch of nanotechnology. Nanoparticles owe their potential on the high specific surface area and surface reactivity compared to conventional bulk materials. Depending on the mechanism of uptake, nanoparticles can be designed to establish high selectivity against specific pollutants and provide the required efficiency for application. However, despite early encouraging results, nanoparticles meet a number of limitations to get promoted and become part of large-scale water treatment plants. The most important is their availability in the required large quantities and their efficiency to fulfil the strict regulations for drinking water consumption and environmental safety. Both deal with the particles preparation cost and the cost of treatment operation with respect to the increase of supplied water price for the consumers. Under this view, this work attempts to evaluate reported studies according to their possibility to meet reliable requirements of water technology and also suggests an experimental approach to allow validation of tested nanoparticles.

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“…The quantitative analysis of the spectrum suggests the presence of around 68 % of captured chromium to be in the form of a Cr(III) oxide such as Cr 2 O 3 with the rest remaining to be solidified directly from the Cr(VI) state. Importantly, the formation of Cr(OH) 3 or adsorbed Cr(VI) which appear as the products of Cr(VI) removal by iron oxides can be excluded [27,28]. Therefore, the mechanism of Cr(VI) uptake can be described by the initial reduction of Cr(VI) oxyanions on surface Cu atoms, the release of consumed copper to water as Cu 2+ and the sorption of formed Cr(III) species on the regenerated Cu surface sites.…”

Section: Cr(vi) Uptake Observationsmentioning

confidence: 99%

Copper foams in water treatment technology: Removal of hexavalent chromium

et al. 2015

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Open-cell copper foams were prepared using a space holder technique and tested as filter-beds for the uptake and reduction of Cr(VI) in drinking water. The use of raw cane sugar as a space holder provides an environmentally friendly method for the production of foams with controllable porous network characteristics. Specifically, by applying a sugar volume of 70-80 % with particle sizes in the range of 0.35-0.70 mm, it was possible to obtain final porosity of 65 %, high structural stability, and enhanced interconnectivity of macropores required for the free flow of treated water. Smaller sugar particles ensure a smaller pore size and a higher specific surface area, favoring the interaction of water with the effective copper surface. Column tests indicated that a realistic filtering system using the Cu-foam can operate with complete Cr(VI) removal and minimum Cu leaching in the pH 7±0.2 range, capturing chromium in the form of Cr(III) and Cr(VI) oxides. Chromium is homogeneously distributed and incorporated into the copper porous network allowing an almost unlimited lifetime of effective use compared to common adsorbents.

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Optimizing magnetic nanoparticles for drinking water technology: The case of Cr(VI)

Cited by 70 publications

References 29 publications

Applications of CTAB modified magnetic nanoparticles for removal of chromium (VI) from contaminated water

Applications of CTAB modified magnetic nanoparticles for removal of chromium (VI) from contaminated water

Inorganic engineered nanoparticles in drinking water treatment: a critical review

Copper foams in water treatment technology: Removal of hexavalent chromium

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