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Microemulsion prepared magnetic nanoparticles for phosphate removal: Time efficient studies
KTH, School of Biotechnology (BIO), Industrial Biotechnology.
KTH, School of Biotechnology (BIO), Industrial Biotechnology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
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2014 (English)In: Journal of Environmental Chemical Engineering, ISSN 2213-3437, Vol. 2, no 1, 185-189 p.Article in journal (Refereed) Published
Abstract [en]

The present study investigates the effective removal of phosphate in sewage wastewater using magnetic iron oxide nanoparticles (MION). The microemulsion-prepared magnetic iron oxide nanoparticles (ME-MION) of around 7-10 nm was synthesized using water-in-oil microemulsion method. The interaction of ME-MION and phosphate was studied using In situ FT-IR technique. Batch experiments were carried out with wastewater to determine the conc. and time efficiency using ME-MION for removal of phosphate. The vibration peak at 1004 cm-1 and the presence of hydroxyl group (OH-) at 3673 cm-1 confirms the binding of phosphate to ME-MION. ME-MION with 0.44 g L-1 exhibited more than 95% phosphate reduction in 5 min and close to 100% in 20 min. Conversely the experimental data obtained has been fitted with Langmuir isotherm model and also exhibited high correlation coefficients. The ME-MION was regenerated and can be reused for minimum 5 consecutive times. Efficient and fast reduction of phosphate was attained while the recovery of nanoparticles was achieved by an external magnetic field. To the author's knowledge, this is the first report that underscores around 100% phosphate removal from wastewater using ME-MION in 20 min. The approach utilized in this study offers a potential technique in the reduction of phosphate in wastewater whilst, reducing the time and reuse of nanoparticles.

Place, publisher, year, edition, pages
2014. Vol. 2, no 1, 185-189 p.
Keyword [en]
FTIR, Magnetic nanoparticles, Microemulsion, Phosphate removal
National Category
Water Treatment Nano Technology
URN: urn:nbn:se:kth:diva-134302DOI: 10.1016/j.jece.2013.12.008ScopusID: 2-s2.0-84891814016OAI: diva2:665745

QC 20140203. Updated from submitted to published.

Available from: 2013-11-20 Created: 2013-11-20 Last updated: 2014-02-03Bibliographically approved
In thesis
1. Application of magnetic nanoparticles and reactive filter materials for wastewater treatment
Open this publication in new window or tab >>Application of magnetic nanoparticles and reactive filter materials for wastewater treatment
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lately sewage wastewater treatment processes (WWTP) are facing challenges due to strict regulations in quality of effluent standards and waste production. The reuse of wastewater treatment effluents is rapidly gaining attention as a means of achieving sustainable water supply. Therefore, new methods are required to achieve an efficient WWTP. The foremost emphasis of the present study is to investigate filter materials, synthesis, characterization, and application of magnetic nanoparticles (NPs) for WWTP. Primarily commercially available reactive filter materials such as Polonite and Sorbulite were tested for the effective reduction of contaminants in recirculation batch mode system. Secondly, the magnetic nanoparticles were synthesized using different techniques such as water-in-oil (w/o) microemulsion and co- precipitation methods and testing for their ability to remove contaminants from wastewater. Thirdly, toxicity test of magnetic NPs were performed using human keratinocytes (HaCaT) and endothelial (HMEC-1) cells (Papers I-VII).

The magnetic iron oxide nanoparticles (MION) synthesized using the co-precipitation method were further functionalized with tri-sodium citrate (TSC), 3-aminopropyl triethoxysilane (APTES), polyethylenimine (PEI) and chitosan. The functionalized MION were further characterized prior to use in removal of contaminants from wastewater. The sewage wastewater samples were collected from Hammarby Sjöstadsverk, Sweden and analyses were performed for the reduction of turbidity, color, total nitrogen, total organic carbon, phosphate and microbial content on the retrieval day.

The experimental results imply that Polonite and Sorbulite require high pH for the efficient reduction of phosphate and the reduction of microbes. Microemulsion prepared magnetic nanoparticles (ME-MION) showed ≈100% removal of phosphate in 20 minutes. Results from TEM implied that the size of magnetic Nps were around 8 nm for core (uncoated MION), TSC (11.5 nm), APTES (20 nm), PEI (11.8 nm) and chitosan (15 nm). Optimization studies using central composite face centered (CCF) design showed the potential of magnetic nanoparticles for the removal of turbidity (≈83%) and total nitrogen (≈33%) in 60 minutes. The sludge water content was reduced significantly by ≈87% when magnetic NPs were used whilst compared to the chemical precipitant used in WWTP. PEI coated MION showed ≈50% removal of total organic carbon from wastewater in 60 minutes. Effluents from wastewater treated with magnetic NPs were comparable with effluent from the present WWTP. There was no significant change observed in mineral ion concentration before and after treatment with MION. In addition, toxicity results from HMEC-1 and HaCaT cells revealed no formation of reactive oxygen species in the presence of magnetic NPs. Furthermore, laboratory experiments revealed the effectiveness and reusability of magnetic NPs. Thus magnetic NPs are a potential wastewater treatment agent and can be used for effective removal of contaminants, thereby reducing the process time, sludge water content and complex process steps involved in conventional WWTP.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. ix, 63 p.
TRITA-BIO-Report, ISSN 1654-2312 ; 2013:20
Reactive filter materials, magnetic nanoparticles, wastewater treatment process, nutrient reduction, sludge water content, toxicity of magnetic nanoparticles
National Category
Water Treatment Engineering and Technology Nano Technology
urn:nbn:se:kth:diva-134236 (URN)978-91-7501-948-2 (ISBN)
Public defence
2013-12-12, FB54, Albanova Universitet Centrum, Roslagstullsbacken 21, Stockholm, 09:30 (English)

QC 20131121

Available from: 2013-11-21 Created: 2013-11-20 Last updated: 2014-03-13Bibliographically approved

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Lakshmanan, RamnathOkoli, ChukaBoutonnet, MagaliJärås, SvenKuttuva Rajarao, Gunaratna
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