Removal of titanium dioxide nanoparticles by coagulation: effects of coagulants, typical ions, alkalinity and natural organic matters

Wang, Hong Tao; Ye, Yinyin; Jing, Qi; Li, F. T.; Tang, Yuening

doi:10.2166/wst.2013.356

Cited by 48 publications

(31 citation statements)

References 2 publications

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“…The presence of humic acid (HA) greatly decreased the removal rate of TiO2 and nC60 ) because of the steric hindrance effects of HA molecules on nanoparticles and the additional negative charge imparted to the nanoparticles. A similar conclusion was drawn in other studies on coagulation of TiO2 (H. Wang et al, 2013) and Ag by 4 different coagulants (alum, ferric chloride, polyaluminum chloride, polyferric sulfate) independently on coagulant type. Alkalinity positively affected nC60 removal during alum coagulation .…”

Section: Introductionsupporting

confidence: 88%

“…Removal efficiencies of eNPs applying coagulation-flocculation-sedimentation (CFS) processes were investigated in several studies. The list of eNPs studied includes TiO2 (H. Wang et al, 2013;, Fe2O3, ZnO, NiO (Yang Zhang et al, 2008), silica (Chang et al, 2007;Yang Zhang et al, 2008), multi-walled carbon nanotubes (CNTs) , quantum dots (QDs) (Y. ,…”

Section: Coagulation Flocculation Sedimentationmentioning

confidence: 99%

“…Removal efficiencies of eNPs by coagulation-flocculation-sedimentation (CFS) process were studied by several authors (Table 1). The list of eNPs studied includes TiO2 (H. Wang et al, 2013;, Fe2O3, ZnO, NiO (Yang Zhang et al, 2008), silica (Chang et al, 2007;Yang Zhang et al, 2008), multi-walled carbon nanotubes (CNTs) , quantum dots (QDs) (Y. , Ag and C60 Lizhu Zhang et al, 2014). The removal efficiencies reported by these studies varied significantly (Table 1): the span of the removal efficiencies was 70%, 80% and 90% for TiO2, Ag and CNTs respectively.…”

Section: Introductionmentioning

confidence: 99%

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Removal of engineered nanoparticles in drinking water treatment processes

Floris

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We passed through earth lightly as water, said Antonio Setzu, as water flowing, springs, from the dip full of the fountain, slides and winds among moss and ferns, down to the roots of the cork oak and almond trees or slips down on the stones, through the mountains and the hills up to the plan, from the streams to the river, slows down towards the swamps and the sea, called by the sun to become vapour and wind dominated cloud and blessed rain. Apart from the madness of killing each other for irrelevant reasons, we were happy. The plants and swamps were fertile, mountains rich of pasture and springs. The food was not lacking even in the years of famine. We did a blood-colored wine, sweet on the palate, and a bearer of happy dreams. On the seventh day of the folding oaks wind month we used met all the nations around the sacred spring, and for seven days and seven nights we ate, drank, we sang and danced in honor of Is. Singing, playing, dancing, grow, harvest, milking, carving, melting, kill, die, singing, playing, dancing was our life. We were happy, apart from the madness of killing each other for insignificant reasons. Passavamo sulla terra leggeri come acqua, disse Antonio Setzu, come acqua che scorre, salta, giù dalla conca piena della fonte, scivola e serpeggia fra muschi e felci, fino alle radici delle sughere e dei mandorli o scende scivolando sulle pietre, per i monti e i colli fino al piano, dai torrenti al fiume, a farsi lenta verso le paludi e il mare, chiamata in vapore dal sole a diventare nube dominata dai venti e pioggia benedetta. A parte la follia di ucciderci l'un l'altro per motivi irrilevanti, eravamo felici. Le piante e le paludi erano fertili, i monti ricchi di pascolo e fonti. Il cibo non mancava neppure negli anni di carestia. Facevamo un vino colore del sangue, dolce al palato e portatore di sogni allegri. Nel settimo giorno del mese del vento che piega le querce incontravamo tutte le genti attorno alla fonte sacra e per sette giorni e sette notti mangiavamo, bevevamo, cantavamo e danzavamo in onore di Is. Cantare, suonare, danzare, coltivare, raccogliere, mungere, intagliare, fondere, uccidere, morire, cantare, suonare, danzare era la nostra vita. Eravamo felici, a parte la follia di ucciderci l'un l'altro per motivi irrilevanti. Passavamo sulla terra leggeri Sergio Atzeni 2.4.6 Discussion overall filtration behaviour under typical full-scale conditions 78 2.5 Conclusion ________________________________________________________________________ 79 Acknowledgement _________________________________________________________________________ 80 References _________________________________________________________________________________ 81 3 Effect of multicomponent fouling during microfiltration of natural surface waters containing nC60 fullerene nanoparticles _________________________________________________ 85 3.1

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Section: Introductionsupporting

confidence: 88%

Section: Coagulation Flocculation Sedimentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of engineered nanoparticles in drinking water treatment processes

Floris

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“…After release into an aquatic environment, water chemistry has significant effect on the aggregation and stability of NPs [14,33,34]. Understanding the aggregation of NPs is essential for predicting their fate and transport in aqueous systems [35].…”

Section: Nanoparticlesmentioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

169

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The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

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“…We chose PFS and FeCl 3 as coagulants because they are widely used in drinking water treatment, and our previous study has indicated that PFS and FeCl 3 have better performance than other coagulants such as polyaluminum chloride (PACl) and alum (Al 2 (SO 4 ) 3 ) for the removal of TiO 2 NPs [16]. The finding of this study is expected to provide fundamental understanding of the reaction between TiO 2 NPs and coagulants, as well as to provide a practical solution for the separation of TiO 2 NPs from water.…”

Section: Introductionmentioning

confidence: 99%