Organically functionalized bentonite for the removal of perfluorooctane sulfonate, phenanthrene and copper mixtures from wastewater

Khodabakhshloo, Nafise; Biswas, Bhabananda; Moore, Farid; Du, Jianhua; Naidu, Ravi

doi:10.1016/j.clay.2020.105883

Cited by 21 publications

(3 citation statements)

References 90 publications

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“…The longer-chain perfluoroalkyl pollutants were removed with yields up to 99%; moreover, the presence of natural organic matter (NOM) greatly lowered the clay transfer performance. Khodabakhshloo et al [46] tested chemically activated clays in refinery waters: the tests were carried out in batches with the use of 0.02 g of adsorbent per 40 mL of wastewater to be treated. The maximum adsorption capacity was 163 mgPFOS/g, and it was noted that the presence of the copper ion Cu 2+ can create bridges for the adsorption of PFOS.…”

Section: Functional Claysmentioning

confidence: 99%

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Collivignarelli,

Bellazzi,

Caccamo

et al. 2023

Sustainability

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Per- and polyfluoroalkyl substances (PFAS) constitute a group of organofluorine chemical synthetic compounds widely used in industries and manufacturing due to their hydrophobic properties. However, PFAS have been found to cause negative human health outcomes. Therefore, a strong interest in the possible removal of these compounds from wastewater (WW) has been shown. This work aims to present a systematic analysis of the scientific literature related to the innovative and alternative adsorbent materials that can be used for treating PFAS-contaminated WW. Moreover, the adsorption processes are considered, focusing the attention on virgin adsorbent materials and biochar as adsorbents. Virgin adsorbent materials comprise conventional adsorbent materials, functional clays, metal–organic frameworks, and functionalized organic polymers. Biochar includes materials obtained from agricultural or food residues and from sewage sludge. The review shows that conventional treatment units using virgin adsorbent materials are characterized by high adsorption capacity, but also high costs. In addition, the refunctionalization of adsorbent materials is difficult to obtain. On the contrary, biochar, which is a residual product of other production processes, appears to be a cost-effective solution.

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Section: Functional Claysmentioning

confidence: 99%

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Collivignarelli,

Bellazzi,

Caccamo

et al. 2023

Sustainability

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“…To surmount this limitation, surfactant modification has arisen as a promising strategy to enhance the adsorption efficiency of bentonite by modifying its surface chemistry and ameliorating its porous structure [9,18,19]. By introducing organic compounds, the resultant organo-bentonite exhibits enhanced pollutant removal capacities in aquatic environments [18,20,21].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Phenols from Aqueous Solution with A pH-Sensitive Surfactant-Modified Bentonite

Cui,

Liao,

Liu

et al. 2023

Separations

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The presence of organic pollutants in wastewater remains a prominent environmental concern due to the related ecological and health hazards. In response, this study employs an adsorptive methodology to address the removal of phenol and catechol, utilizing an organo-bentonite material modified with a pH-responsive switchable surfactant, dodecyldimethylamine oxide (C12DAO). The synthesized organo-bentonite (C12DAO-Bt) manifests commendable thermostability resulting from thermogravimetric analyses. The adsorption capacities of C12DAO-Bt concerning phenol and catechol intensify with the augmentation of the C12DAO/bentonite mass ratio. The utmost adsorption capacities of 150C12DAO-Bt, deduced through a pseudo-second-order kinetic model, stand at 5.72 mg·g−1 for phenol and 5.55 mg·g−1 for catechol, respectively. Subject to modification by a pH-responsive surfactant, conditions leaning towards weakly acidic and neutral conditions (pH = 6~7) are conducive to the adsorption of phenolic compounds. Conversely, alkaline conditions (pH = 8~9) facilitate the dissociation of adsorbates from adsorbents. The augmentation of cationic strength within the examined scope incites the adsorption procedure while impeding the desorption efficacy. In the case of cationic species with comparable ionic strengths, Na+ exhibited a superior effect on the adsorption–desorption dynamics of phenol, while Ca2+ exerts a more pronounced effect on those of catechol. Moreover, even following five consecutive acid–base regulation cycles, C12DAO-Bt retains a relatively high adsorption capacity and desorption efficacy, which underscores its exceptional regenerative capacity for removing phenolic compounds from wastewater.

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“…Usually, these materials are grouped based on the type of host (i.e., the layered mineral) and guest molecule involved in the interaction. Three main types of functionalized layer silicates can be identified, namely, (i) organoclays, which are layered silicates (typically smectites) bound to an organic molecule (or to an organo-metallic complex) that imparts peculiar properties to the modified minerals; − (ii) pillared clays, which are layered silicates intercalated with small organic or inorganic complexes (i.e., “pillars”), partially filling the interlayer space; − and (iii) clay mineral-nanocomposites, which are fine-particulate materials, heterogeneous at the nanoscale level, made at least from one clay mineral and from other materials such as polymers, pharmaceuticals, inorganic molecules, or carbon. − …”

Section: Introductionmentioning

confidence: 99%

Gaseous Heptanethiol Removal by a Fe³⁺-Phenanthroline–Kaolinite Hybrid Material

et al. 2021

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Kaolinite functionalized by the μ-oxo Fe3+-phenanthroline complex (Fe+3Phen) was selected to test its ability to efficiently remove and store gaseous heptanethiol (HPT). Spectroscopic techniques, elemental analysis, and thermal analysis coupled with evolved gas mass spectrometry were employed to characterize the material before and after the exposure to the gas and to define the adsorption process. The amount of HPT trapped by the functionalized kaolinite after 60 days is 0.10940 moles per 100 g of kaolinite which, considering the amount of adsorbed Fe+3Phen (0.00114 moles per 100 g of kaolinite), means a thiol/Fe3+Phen molar ratio of about 100:1, a value much higher than those found in the past for Fe+3Phen functionalized montmorillonite and sepiolite. In addition, the process was found to be efficient also beyond 60 days. This significant removal of the smelly gas was explained by considering a continuous catalytic activity of Fe3+ toward the oxidation of thiol to disulfide.

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Organically functionalized bentonite for the removal of perfluorooctane sulfonate, phenanthrene and copper mixtures from wastewater

Cited by 21 publications

References 90 publications

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Adsorption of Phenols from Aqueous Solution with A pH-Sensitive Surfactant-Modified Bentonite

Gaseous Heptanethiol Removal by a Fe³⁺-Phenanthroline–Kaolinite Hybrid Material

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Organically functionalized bentonite for the removal of perfluorooctane sulfonate, phenanthrene and copper mixtures from wastewater

Cited by 21 publications

References 90 publications

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Adsorption of Phenols from Aqueous Solution with A pH-Sensitive Surfactant-Modified Bentonite

Gaseous Heptanethiol Removal by a Fe3+-Phenanthroline–Kaolinite Hybrid Material

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Product

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Gaseous Heptanethiol Removal by a Fe³⁺-Phenanthroline–Kaolinite Hybrid Material