Adsorption Mechanisms of Psychoactive Drugs onto Montmorillonite

Thiebault, Thomas; Boussafir, Mohammed

doi:10.1016/j.colcom.2019.100183

Cited by 23 publications

(20 citation statements)

References 26 publications

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“…NA (Khazri et al, 2017) Oxazepam 286.7 Na-Mt. 76 32 N 7.5 RT 9.5 2.77 (Thiebault & Boussafir, 2019) Oxytetracycline 460.4 Na-Mt. 76 32 A 11.0 NA 86.9 2.39 (Kulshrestha et al, 2004)…”

Section: Kga-1bmentioning

confidence: 99%

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Thiebault

2019

Critical Reviews in Environmental Science and Technology

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The occurrence of pharmaceutical products (PPs) within environmental compartments challenges the scientific community and water treatment operators to find suitable and practicable removal solutions. Clay minerals are among the oldest and cheapest adsorbents used for the removal of organic and inorganic pollutants. However, despite their significant adsorption properties, little is known about their potential to remove organic contaminants such as pharmaceutical products from wastewater effluents. Hence, based on the latest published articles this review aims to standardize the adsorption properties of clay minerals for the removal of PPs. Specifically, the charge state of PPs appears to play a key role in their adsorption mechanism. In order to overcome the limitations of batch experiments (i.e. idealized solutions, static conditions) and design of a field solution, the impact of external parameters on the adsorption capacities of clay minerals is reviewed. The effect of thermal treatment and acid activation of clay minerals is also assessed in order to better understand the consequences of such modifications on the adsorption properties of clay-based adsorbents. Finally, even if most authors agree on the potential of clay-based adsorbents for the removal of PPs from wastewater, there remain significant gaps in the existing literature that need to be filled, with the aim of forecasting the real potential of clay-based treatment for the removal of pharmaceutical products at industrial scale.

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“…NA (Khazri et al, 2017) Oxazepam 286.7 Na-Mt. 76 32 N 7.5 RT 9.5 2.77 (Thiebault & Boussafir, 2019) Oxytetracycline 460.4 Na-Mt. 76 32 A 11.0 NA 86.9 2.39 (Kulshrestha et al, 2004)…”

Section: Kga-1bmentioning

confidence: 99%

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Thiebault

2019

Critical Reviews in Environmental Science and Technology

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“…between 0 and 11%). This variation between PPs with closely related properties highlights the important role of the starting concentrations of PPs in order to assess their affinity with clay minerals (Thiebault and Boussafir, 2019), and of the affinity of PPs with organic moieties for the adsorption onto clay minerals in effluent solutions (Torrents and Jayasundera, 1997).…”

Section: Neutral Ppsmentioning

confidence: 97%

Clay minerals for the removal of pharmaceuticals: Initial investigations of their adsorption properties in real wastewater effluents

Thiebault

Boussafir

Fougère

et al. 2019

Environmental Nanotechnology, Monitoring & Management

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The adsorption of pharmaceutical products (PPs) onto kaolinite and raw and sodium-exchanged montmorillonite was investigated in real wastewater effluents (WWE). The important role of the charge state of the PPs in controlling the adsorption extent was highlighted. Whereas cationic PPs were mostly adsorbed through cation exchange, the adsorption of neutral and anionic PPs appeared to be controlled by the nature of compensating inorganic cations and/or the simultaneous adsorption of organic moieties onto clay minerals. In raw WWE, the concentration of PPs is indeed far lower than the concentration of other organic molecules. Among the adsorbents tested, kaolinite displayed the lowest adsorption capacity of both PPs and other organic molecules, compared to raw montmorillonite which presented the highest adsorption capacity. The sodium-exchanged montmorillonite displayed intermediate adsorption properties, highlighting the key role of divalent inorganic cations in the adsorption of non-cationic PPs and other organic molecules. Hence, raw 2 montmorillonite appears to be the most promising adsorbent for further investigations aiming to test the practicability of a clay-based adsorbent for the removal of organic contaminants, such as PPs, in WWE.

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“…Low pH is acknowledged as a promoting factor for sorptive processes. It is indeed well recognized that acidic conditions enhance the uptake of both inorganic and organic ions (Mahamat Ahmat et al, 2016, 2017; Nodvin et al, 1986; Thiebault and Boussafir, 2019). By controlling the protonation and deprotonation state of mineral surfaces, background acidity affects the distribution of electrical charges (Park et al, 2002; Tournassat et al, 2016), thus constraining the intensity of the sorptive mechanism.…”

Section: Sulfates Removal Via Adsorptionmentioning

confidence: 99%

Over-sulfated soils and sediments treatment: A brief discussion on performance disparities of biological and non-biological methods throughout the literature

Ahmat

Mamindy-Pajany

2021

Waste Manag Res

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High sulfate concentrations in industrial effluents as well as solid materials (excavated soils, dredged sediments, etc.) are a major hindrance for circular economy outlooks. SO42- acceptability standards are indeed increasingly restrictive, given the potential outcomes for public health and ecosystems. This literature review deals with the treatment pathways relying on precipitation, adsorption and microbial redox principles. Although satisfactory removal performances can be achieved with each of them, significant yield differences are displayed throughout the bibliography. The challenge here was to identify the parameters leading to this variability and to assess their impact. The precipitation pathway is based on the formation of two main minerals (ettringite and barite). It can lead to total sulfate removal but can also be limited by aqueous wastes chemistry. Stabilizer kinetics of formation and equilibrium are highly constrained by background properties such as pH, Eh, SO42- saturation state and inhibiting metal occurrences. Regarding the adsorption route, sorbents’ intrinsic features such as the qmax parameter govern removal yields. Concerning the microbial pathway, the chemical oxygen demand/SO42- ratio and the hydraulic retention time, which are classically evoked as yield variation factors, appear here to be weakly influential. The effect of these parameters seems to be overridden by the influence of electron donors, which constitute a first order factor of variability. A second order variability can be read according to the nature of these electron donors. Approaches using simple monomers (ethanol lactates, etc.) perform better than those using predominantly ligneous organic matter.

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Adsorption Mechanisms of Psychoactive Drugs onto Montmorillonite

Cited by 23 publications

References 26 publications

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Clay minerals for the removal of pharmaceuticals: Initial investigations of their adsorption properties in real wastewater effluents

Over-sulfated soils and sediments treatment: A brief discussion on performance disparities of biological and non-biological methods throughout the literature

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