A review of organic-inorganic hybrid clay based adsorbents for contaminants removal: Synthesis, perspectives and applications

Gil, Antonio; Santamarı́a, L.; Korili, S.A.; Vicente, M.A.; Barbosa, Lorrana Vietro; Souza, Suelen Delfino; Marçal, Liziane; Faria, Emerson H. de; Ciuffi, Kátia J.

doi:10.1016/j.jece.2021.105808

Cited by 80 publications

(24 citation statements)

References 181 publications

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“…Nano-composites of bentonite, kaolinite, montmorillonite, palygorskite, saponite, sepiolite [69], cloisite 30B (nanoclay) [70], halloysite [71] are widely reported but to the extent of our knowledge only a few results were reported on nontronite [68,72].…”

Section: Fig 2 Classification Of Smectite Claysmentioning

confidence: 92%

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Nontronite-Starch based Nano-Composites and Applications

Bajpai¹

2022

Materials Research Foundations

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Polymer nano-composites consist of two or more constituents with at least one being of nanoscale dimension. Being naturally abundant, affordable, non-toxic and biocompatible, clay-based minerals and biopolymers are advantageous to afford eco-friendly nanocomposites, especially useful for biological applications. Starch, a common polysaccharide, finds traditional use in the food industry, and has recently become relevant in several advanced technologies. Nontronite, an iron rich smectite clay, still remains underexplored in the context of nanocomposite preparation. This book chapter attempts to provide a brief overview of syntheses and applications of nanocomposites based on nontronite, starch and polysaccharide-clay.

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Section: Fig 2 Classification Of Smectite Claysmentioning

confidence: 92%

“…Clay minerals are valuable in development of novel functional materials because their interlayer functional groups are a key factor. They offer numerous possibilities for applications as catalysts, photocatalysts, drug delivery systems, adsorbents, and nanocomposites [75].…”

Section: Clay Nanocompositesmentioning

confidence: 99%

Nontronite-Starch based Nano-Composites and Applications

Bajpai¹

2022

Materials Research Foundations

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“…Hybrid materials, consisting of carrier matrices of inorganic origin and an active compound of organic/inorganic type, are more and more common in current studies, especially in fields such as medicine, environmental protection or catalysis [1][2][3][4][5]. Inorganic matrices, such as clays, are very often used due to availability, low price, structural diversity and the possibility of recycling [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Of these, the former acts as an adsorbent and is usually used in water purification processes. In this case, the clays are conditioned by different methods so that the adsorption processes of organic/inorganic compounds that pollute the water are as efficient as possible [1,6]. These types of supports have been modified according to the nature of the active substances transported, the structure of clay-based matrices becoming much more complex.…”

Section: Introductionmentioning

confidence: 99%

Influence of Organic-Modified Inorganic Matrices on the Optical Properties of Palygorskite–Curcumin-Type Hybrid Materials

et al. 2022

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Clays are very important from an economic and application point of view, as they are suitable hosts for organic compounds. In order to diversify the fields of application, they are structurally modified by physical or chemical methods with cationic species, and/or different bifunctional compounds, such as organosilanes. In this study, palygorskite was modified with (3-Aminopropyl) triethoxysilane, which was subsequently modified at the amino group by grafting an acetate residue. By using this strategy, two types of host hybrid materials were obtained on which curcumin derivatives were deposited. The composites obtained were structurally characterized and their photophysical properties were investigated in relation to the structure of the host matrices and interactions with curcumin-type visiting species. The hybrid composites have different colors (orange, yellow, pink), depending on the polarity of the inorganic matrices modulated by different organic groups grafted at the surface. Fluorescence emission in the visible range is characterized by the presence of two emission maxima, one belonging to the chromophore and the other influenced by the physical interactions between auxochromes and host matrices. These hybrid materials, compared to other composite structures, are obtained by a simple adsorption process. They are temperature stable in aggressive environments (acid/base) and render the fluorescent properties of dyes redundant, with improved luminescent performance compared to them.

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“…To develop soil bioaccumulation, organosilanes are often used to produce organically modified soil and clay in order to improve heavy metal binding sites and to adjust the hydrophobicity of soil/clay [26]. In the case of clay, the amount of organosilane loading is generally determined by the cation exchange of the clay and, in the case of soil, by the reactive chemical sites of the soil [27,28].…”

Section: Introductionmentioning

confidence: 99%

Removal of Cd (II) Ions from Bioretention System by Clay and Soil Wettability

Cai

et al. 2021

Water

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In this work, a silane modifier with benzyl substitutes (OFS-B) and linear substitutes (OFS-L) was used to modify bentonite clay and soil, and the results were characterized by Fourier transform-infrared absorption spectroscopy (FT-IR) and powder-X-ray diffraction (XRD) analysis. A contact angle analysis was performed to determine the wettability of modified clay and soil. The findings revealed that silane-modified OFS-L clay and soil produced wettable surfaces, while OFS-B exhibited hydrophobic properties. These clays and soils were used in a bioretention system for Cd (II) removal. In the study, seven different types of bioretention systems, including natural, OFS-L, and OFS-B modified clay and soil, as well as natural, OFS-L, and OFS-B modified soil, were applied to Cyperus alternifolius plants without an additional layer. The removal capacity of Cd (II) was measured in the following order: modified clay > modified soil > original clay/soil > no layer, i.e., 99.48%, 92.22%, 88.10/78.5%, and 30.0%, respectively. OFS-L removed more Cd (II) than OFS-B during the modification. OFS-L now improves the bioavailability and accumulation of Cd (II) in the plant (18.5 µg/g) and has a higher chlorophyll-b concentration (1.92 mg/g fresh weight) than other systems. The wettable clay exhibited clay leaching into the various levels of the bioretention system. In the bioretention system, benzyl substituted clay prevented the penetration of water and formed a Cd (II) agglomeration. When compared to non-wettable modifiers, these results indicated that wettable clay material could be a capable material for removing Cd (II).

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A review of organic-inorganic hybrid clay based adsorbents for contaminants removal: Synthesis, perspectives and applications

Cited by 80 publications

References 181 publications

Nontronite-Starch based Nano-Composites and Applications

Nontronite-Starch based Nano-Composites and Applications

Influence of Organic-Modified Inorganic Matrices on the Optical Properties of Palygorskite–Curcumin-Type Hybrid Materials

Removal of Cd (II) Ions from Bioretention System by Clay and Soil Wettability

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