Nanoplastics adsorption and removal efficiency by granular activated carbon used in drinking water treatment process

Arenas, Lina Marcela Ramirez; Gentile, Stéphan Ramseier; Zimmermann, Stéphane; Stoll, Serge

doi:10.1016/j.scitotenv.2021.148175

Cited by 78 publications

(27 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microrobots reached a q t of 0.5 ± 0.1 mg g −1 within 1 min treatment. This value is close to that reported for other materials, such as granular activated carbon (~0.3-0.7 mg g −1 after 15 min) 59 , cellulose fibers (0.8–0.86 mg g −1 after 5–120 min) 60 , and untreated coffee grains (>2 mg g −1 after 5 min) 61 , despite having a larger surface area and being utilized under external agitation.…”

Section: Resultssupporting

confidence: 87%

Trapping and detecting nanoplastics by MXene-derived oxide microrobots

et al. 2022

View full text Add to dashboard Cite

Nanoplastic pollution, the final product of plastic waste fragmentation in the environment, represents an increasing concern for the scientific community due to the easier diffusion and higher hazard associated with their small sizes. Therefore, there is a pressing demand for effective strategies to quantify and remove nanoplastics in wastewater. This work presents the “on-the-fly” capture of nanoplastics in the three-dimensional (3D) space by multifunctional MXene-derived oxide microrobots and their further detection. A thermal annealing process is used to convert Ti3C2Tx MXene into photocatalytic multi-layered TiO2, followed by the deposition of a Pt layer and the decoration with magnetic γ-Fe2O3 nanoparticles. The MXene-derived γ-Fe2O3/Pt/TiO2 microrobots show negative photogravitaxis, resulting in a powerful fuel-free motion with six degrees of freedom under light irradiation. Owing to the unique combination of self-propulsion and programmable Zeta potential, the microrobots can quickly attract and trap nanoplastics on their surface, including the slits between multi-layer stacks, allowing their magnetic collection. Utilized as self-motile preconcentration platforms, they enable nanoplastics’ electrochemical detection using low-cost and portable electrodes. This proof-of-concept study paves the way toward the “on-site” screening of nanoplastics in water and its successive remediation.

show abstract

Section: Resultssupporting

confidence: 87%

Trapping and detecting nanoplastics by MXene-derived oxide microrobots

et al. 2022

View full text Add to dashboard Cite

show abstract

“…This indicates that both the water matrix and possibly the presence of biomass in the sand, contribute to the removal of nanoparticles. This is in accordance with the findings on nanoplastics of Ramirez-Arenas et al 40 An explanation might be that NOM from the surface water covers both the filter grains and the nanoparticles, thus facilitating sorption of nanoparticles to the filter material. Furthermore, nanoparticles may be entrapped by NOM, and the presence of cations (Ca 2+ /Mg 2+ ) may also play a role, as was concluded from the previous section.…”

Section: Resultssupporting

confidence: 92%

“…The removal of nanoparticles by means of CSF has been described in literature, [32][33][34][35][36][37][38] but studies on sand or GAC (granular activated carbon) filtration are limited. Ramirez Arenas et al [39][40][41] studied the effect of coagulation and filtration over sand or GAC filters on the removal of polystyrene nanoparticles (90 ± 7 nm). The efficiency of the CSF process strongly depends on parameters, such as the type of nanoparticles, composition and concentration of NOM, ions, pH, and type and dosing of the coagulant.…”

Section: Introductionmentioning

confidence: 99%

Removal of nanoparticles (both inorganic nanoparticles and nanoplastics) in drinking water treatment – coagulation/flocculation/sedimentation, and sand/granular activated carbon filtration

Hofman-Caris

Bäuerlein

Siegers

et al. 2022

Environ. Sci.: Water Res. Technol.

View full text Add to dashboard Cite

show abstract

“…When applied to natural surface water from Lake Geneva, the adsorption capacity significantly increased with increasing PS NPs concentration with a maximum adsorption capacity of 6.33 ± 0.20 mg/g. The higher removal efficiency was observed in Lake Geneva water, especially at higher NPs concentrations (from 10 to 40 mg/L), reaching 90 % of removal at 20 mg/L [ 174 ].…”

Section: Remediation Strategies For Nanoplastic Surge In Africamentioning

confidence: 99%