Removal of TiO2 nanoparticles from water by low pressure pilot plant filtration

Olabarrieta, Josune; Monzón, Oihane; Belaustegui, Yolanda; Alvarez, Jon-Iñaki; Zorita, Saioa

doi:10.1016/j.scitotenv.2017.11.003

Cited by 17 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This reduced flux was consistent with the decreased porosity for AZO membranes (61 ± 2% for AZO25, 57 ± 3% for AZO37, and 43 ± 3% for AZO25) compared to the plain 0.22 μm PVDF membrane (75 ± 4%) (Figure S3). The fluxes of AZO membranes were still above the recommended filtration flux of 50–100 LMH for typical microfiltration conditions so that the membranes were not operated at the maximum flux to avoid severe fouling and more frequent cleaning …”

Section: Resultsmentioning

confidence: 99%

Adapting Aluminum-Doped Zinc Oxide for Electrically Conductive Membranes Fabricated by Atomic Layer Deposition

Yang

Son

Rossi

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The use of electrically conductive membranes has recently drawn great interest in water treatment as an approach to reduce biofouling. Most conductive membranes are made by binding nanoparticles (carbon nanotubes or graphene) to a polymeric membrane using additional polymers, but this method risks leaching these nanomaterials into the environment. A new approach was developed here based on producing an electrically conductive layer of aluminum-doped zinc oxide (AZO) by atomic layer deposition. The aqueous instability of AZO, which is a critical challenge for water applications, was solved by capping the AZO layer with an ultrathin (∼11 nm) TiO2 layer (AZO/TiO2). The combined film exhibited prolonged stability in water and had a low sheet resistance of 67 Ω/sq with a 120 nm-thick coating, while the noncapped AZO coating quickly deteriorated as shown by a large increase in membrane resistance. The AZO/TiO2 membranes had enhanced resistance to biofouling, with a 72% reduction in bacterial counts in the absence of an applied current due to its higher hydrophilicity than the bare polymeric membrane, and it achieved an additional 50% reduction in bacterial colonization with an applied voltage. The use of TiO2-capped AZO layers provides a new approach for producing conductive membranes using abundant materials, and it avoids the risk of releasing nanoparticles into the environment.

show abstract

Section: Resultsmentioning

confidence: 99%

Adapting Aluminum-Doped Zinc Oxide for Electrically Conductive Membranes Fabricated by Atomic Layer Deposition

Yang

Son

Rossi

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Likewise, during the use of nano-TiO2 in aqueous systems, a combination of humic acid and HCO3increased the release of Ti in water. Olabarrieta et al (2018) reported that the nano-TiO2 rejection rate was generally above 95% in a low-pressure membrane filtration pilot plant, and 2.3 g of the NPs could be released when treating 31 m 3 of tap water with 2 mg/L nano-TiO2.…”

Section: Environmental Risk Of Nanomaterialsmentioning

confidence: 99%

Nanomaterials for sustainable remediation of chemical contaminants in water and soil

Mukhopadhyay

Sarkar

Khan

et al. 2021

Critical Reviews in Environmental Science and Technology

View full text Add to dashboard Cite

Rapid growth in population, industry, urbanization and intensive agriculture have led to soil and water pollution by various contaminants. Nanoremediation has become one of the most successful emerging technologies for cleaning up soil and water contaminants due to the high reactivity of nanomaterials (NMs). Numerous publications are available on the use of NMs for removing contaminants, and the efficiencies are often improved by modifications of NMs with polymers, clay minerals, zeolites, activated carbon, and biochar. This paper critically reviews the current state-of-the-art NMs used for sustainable soil and water remediation, focusing on their applications in novel remedial approaches, such as adsorption/filtration, catalysis, photodegradation, electro-nanoremediation, and nano-bioremediation. Insights into process performances, modes of deployment, potential environmental risks and their management, and the consequent societal and economic implications of using NMs for soil and water remediation indicate that widespread acceptance of nanoremediation technologies requires not only a substantial advancement of the underpinning science and engineering aspects themselves, but also practical demonstrations of the effectiveness of already recognized approaches at real world in-situ conditions. New research involving green nanotechnology, nano-bioremediation, electronanoremediation, risk assessment of NMs, and outreach activities are needed to achieve successful applications of nanoremediation at regional and global scales.

show abstract

“…NPs have become a part of modern life. NPs have been used in various industrial processes and commercial products such as cosmetics, coatings, construction, and environmental remediation [27,28]. These NPs can be used as adsorbents for contact with metallic species [29] since they provide substantial binding sites for interaction [30].…”

Section: Introductionmentioning

confidence: 99%

Iron Oxide (Fe3O4)-Supported SiO2 Magnetic Nanocomposites for Efficient Adsorption of Fluoride from Drinking Water: Synthesis, Characterization, and Adsorption Isotherm Analysis

Sarwar

Wang

Khan

et al. 2021

Water

View full text Add to dashboard Cite

This research work reports the magnetic adsorption of fluoride from drinking water through silica-coated Fe3O4 nanoparticles. Chemical precipitation and wet impregnation methods were employed to synthesize the magnetic nanomaterials. Moreover, the synthesized nanomaterials were characterized for physicochemical properties through scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray powder diffraction. Screening studies were conducted to select the best iron oxide loading (0.0–1.5 wt%) and calcination temperature (300–500 °C). The best selected nanomaterial (0.5Fe-Si-500) showed a homogenous FeO distribution with a 23.79 nm crystallite size. Moreover, the optimized reaction parameters were: 10 min of contact time, 0.03 g L−1 adsorbent dose, and 10 mg L−1 fluoride (F−) concentration. Adsorption data were fitted to the Langmuir and Freundlich isotherm models. The Qm and KF (the maximum adsorption capacities) values were 5.5991 mg g−1 and 1.869 L g−1 respectively. Furthermore, accelerated adsorption with shorter contact times and high adsorption capacity at working pH was among the outcomes of this research work.

show abstract

Removal of TiO2 nanoparticles from water by low pressure pilot plant filtration

Cited by 17 publications

References 30 publications

Adapting Aluminum-Doped Zinc Oxide for Electrically Conductive Membranes Fabricated by Atomic Layer Deposition

Adapting Aluminum-Doped Zinc Oxide for Electrically Conductive Membranes Fabricated by Atomic Layer Deposition

Nanomaterials for sustainable remediation of chemical contaminants in water and soil

Iron Oxide (Fe3O4)-Supported SiO2 Magnetic Nanocomposites for Efficient Adsorption of Fluoride from Drinking Water: Synthesis, Characterization, and Adsorption Isotherm Analysis

Contact Info

Product

Resources

About