Removal of Metal Oxide Nanoparticles from Aqueous Suspensions

Surawanvijit, Sirikarn; Liu, Haoyang Haven; Kim, Myung-man; Cohen, Yoram

doi:10.1080/01496395.2013.845850

Cited by 14 publications

(6 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the most promising and reliable techniques in water purification is membrane technology, which has already proven to be effective in the removal of colloidal particles such as proteins, natural organic matter and inorganic particles (e.g. [2][3][4][5]). However, not much is known about membrane filtration and the dynamics of fouling by engineered nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Trzaskuś

Vos

Kemperman

et al. 2015

Journal of Membrane Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Trzaskuś

Vos

Kemperman

et al. 2015

Journal of Membrane Science

View full text Add to dashboard Cite

“…The decrease in pH value might lower the negative surface potential of TA-CuO NPs; however, it does not reverse the surface charge from negative to positive ( Figure 3 A). The high dosage of PAFC can oversaturate the negative TA-CuO NPs and positively charged colloids [ 20 ]. The ζ-potential was increased with increasing PAFC concentration in the solution ( Figure 4 C).…”

Section: Resultsmentioning

confidence: 99%

Removal of Tannic Acid Stabilizes CuO Nanoparticles from Aqueous Media by PAFC: Effect of Process Conditions and Water Chemistry

2021

View full text Add to dashboard Cite

The increased utilization of CuO nanoparticles (CuO NPs) in various fields has raised concerns about their discharge into water containing a wide range of organic ligands. Moreover, the adsorption of these ligands can stabilize the CuO NPs in drinking water treatment plants. Thus, their removal from potable water is important to mitigate the risk to humans. The present study explored the efficacy of the coagulation–sedimentation (C/S) process for the removal of tannic acid (TA)-stabilized CuO NPs using polyaluminum ferric chloride (PAFC) as a coagulant. Moreover, the influence of process conditions (stirring speed) and water chemistry (i.e., pH and ionic strength (IS)) were also investigated to determine their impact on removal. The results showed that stirring speed in the reaction phase significantly affected the removal due to increased flocculation compared with stirring speed in the mixing phase. In addition, pH and IS affect the colloidal stability and removal efficiency of CuO NPs. A relatively better removal performance (<99%) of CuO NPs was found at lower coagulant dosage in the pH range 6–8. The addition of organic ligands reversed the surface charge potential and enhanced the colloidal stability of CuO NPs, resulting in the destabilization of TA-CuO NPs, thereby reducing the optimum PAFC dosage for removal. By contrast, the IS above the critical coagulation concentration decreased the removal efficiency due to inhibition of the ionic activity of PAFC hydrolysate in the aqueous environment. Fourier transform infrared findings of TA-CuO NPs composite flocs suggest that the primary removal mechanism might be mediated via the combined effect of neutralization, complexation as well as adsorption.

show abstract

“…The flocculated nanoparticles are larger in size and heavier in mass, hence promoting the subsequent separation process. Numerous researchers proved that using the hybrid process of flocculation and other separation methods offered an enhanced separation efficiency 61, 62. For instance, Zinchenko et al 25 reported that a preflocculated gold nanorod (10 × 30 nm) achieved 100 % separation after being processed through 24‐h precipitation, filtration using 0.20 μm filter, or centrifugation at 10 000 rpm.…”

Section: Hybrid Process Of Flocculation and Other Methods For The Sepmentioning

confidence: 99%

Separation of Nano‐scaled Particles by Flocculation

2021

View full text Add to dashboard Cite

Owing to the increased application of nanoparticles in engineering industries, the development of separation techniques to isolate nanoparticles grew as important as the one to isolate micro‐ or macro‐sized particles. Centrifugation, filtration, and precipitation are the common processes used to separate nanoparticles from a suspension. Interestingly, these processes work best if the nanoparticles are preflocculated into a larger cluster. Flocculation of nanoparticles may involve a complex mechanism affected by the physicochemical and molecular properties of the flocculant. A review of the effects induced by these factors on the flocculation of nanoparticles is given. The applications of advanced flocculation approaches as well as the research gaps in this research area are discussed.

show abstract

Removal of Metal Oxide Nanoparticles from Aqueous Suspensions

Cited by 14 publications

References 41 publications

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Removal of Tannic Acid Stabilizes CuO Nanoparticles from Aqueous Media by PAFC: Effect of Process Conditions and Water Chemistry

Separation of Nano‐scaled Particles by Flocculation

Contact Info

Product

Resources

About