A Review on the Use of Nanoclay Adsorbents in Environmental Pollution Control

Iravani, Rezvan; An, Chunjiang; Adamian, Younes; Mohammadi, Mohammad

doi:10.1007/s11270-022-05580-2

Cited by 17 publications

(4 citation statements)

References 84 publications

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“…, where M 2+ is a divalent metal cation (e.g., Mg 2+ , Ni 2+ , or Zn 2+ ), M 3+ is a trivalent metal cation (e.g., Al 3+ , Fe 3+ , or Cr 3+ ), A n− represents the interlayer inorganic or organic anions that compensate the charge (e.g., ), and x is a calculated ratio between M(II)/ M(III) + M(II), with values ranging from 0 to 0.4. 28 Among their relevant characteristics, those related to their adsorption/ desorption and thermal stability properties have captivated researchers' attention because they can be used in drug delivery, 21,29 adsorbents, 30 catalysts, 31 and fire retardants. 25 Although Mg-Al LDH has been proposed and probed as a delivery system for pathogen control compounds and plant fertilizers in different organisms, 24,29,32,33 these studies do not focus directly on the toxicity of the nanostructure itself on target organisms; instead, they evaluate the general effect that involves other components, making its possible toxicological effect hard to establish.…”

Section: Introductionmentioning

confidence: 99%

“…, NO 3 − , CO 3 2− , or SO 4 2− ), and x is a calculated ratio between M( ii )/M( iii ) + M( ii ), with values ranging from 0 to 0.4. 28 Among their relevant characteristics, those related to their adsorption/desorption and thermal stability properties have captivated researchers' attention because they can be used in drug delivery, 21,29 adsorbents, 30 catalysts, 31 and fire retardants. 25…”

Section: Introductionmentioning

confidence: 99%

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Mg–Al LDH nanosheets as a nanotechnological tool in agriculture: an exploratory toxicity evaluation study

Salinas-Jiménez,

Vera,

Tobar

et al. 2024

Environ. Sci.: Nano

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mg–Al LDH nanosheets as a nanotechnological tool in agriculture: an exploratory toxicity evaluation study

Salinas-Jiménez,

Vera,

Tobar

et al. 2024

Environ. Sci.: Nano

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“…Nanoclay materials surely fit the advantages mentioned above as sorbents to remove various pollutants, such as heavy metals, pesticides and antibiotics [ 17 , 18 ]. Among nanoclays, those displaying a tubular structure are even more intriguing, due to their additional properties related to the nanoscale dimension, cylindrical hollow form, and porosity.…”

Section: Introductionmentioning

confidence: 99%

Fe3O4-Halloysite Nanotube Composites as Sustainable Adsorbents: Efficiency in Ofloxacin Removal from Polluted Waters and Ecotoxicity

et al. 2022

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The present work aimed at decorating halloysite nanotubes (HNT) with magnetic Fe3O4 nanoparticles through different synthetic routes (co-precipitation, hydrothermal, and sol-gel) to test the efficiency of three magnetic composites (HNT/Fe3O4) to remove the antibiotic ofloxacin (OFL) from waters. The chemical–physical features of the obtained materials were characterized through the application of diverse techniques (XRPD, FT-IR spectroscopy, SEM, EDS, and TEM microscopy, thermogravimetric analysis, and magnetization measurements), while ecotoxicity was assessed through a standard test on the freshwater organism Daphnia magna. Independently of the synthesis procedure, the magnetic composites were successfully obtained. The Fe3O4 is nanometric (about 10 nm) and the weight percentage is sample-dependent. It decorates the HNT’s surface and also forms aggregates linking the nanotubes in Fe3O4-rich samples. Thermodynamic and kinetic experiments showed different adsorption capacities of OFL, ranging from 23 to 45 mg g−1. The kinetic process occurred within a few minutes, independently of the composite. The capability of the three HNT/Fe3O4 in removing the OFL was confirmed under realistic conditions, when OFL was added to tap, river, and effluent waters at µg L−1 concentration. No acute toxicity of the composites was observed on freshwater organisms. Despite the good results obtained for all the composites, the sample by co-precipitation is the most performant as it: (i) is easily magnetically separated from the media after the use; (ii) does not undergo any degradation after three adsorption cycles; (iii) is synthetized through a low-cost procedure. These features make this material an excellent candidate for removal of OFL from water.

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“…These alumino-silicate XRD-amorphous minerals have specific characteristics, namely particle size at the nanometer scale, so that their specific surface areas are remarkably high and exhibit Si-OH (silanol), Fe-OH (ferrol), and Al-OH (aluminol) reactive surfaces with pH-dependent charge characteristic (Abidin et al 2007;Yuan and Wada 2012). By adjusting the process of their separation to proceed at pH < 4,0, it could be obtained net positive charged 'nanoclay', while those negatively charged would be precipitated and vice versa when the process was conditioned to pH >10,0 (Calabi-Floody et al 2009;Henmi and Wada 1976;Iravani et al 2022). Therefore, the separated 'nanoclay' could be used as a natural adsorbent for the removal of anionic or cationic contaminants, depending on the pH of its separation process.…”

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption characteristics of ‘nanoclay’ separated from Indonesian volcanic tuffs

Sudadi

Imaduddin²,

Iskandar³

2022

JPSL

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From an Indonesian volcanic tuff taken from parent material layer of an Andisols profile, it was separated ‘nanoclay’ fraction of <200 nm particle size. The separated ‘nanoclay’ exhibits pH-dependent charge characteristic due to the presence of allophane in the tuff. Therefore, it can be utilized as a natural anionic adsorbent since its separation process was conditioned to proceed at pH <4.0. This study aims to compare phosphate adsorption characteristics of positively charged ‘nanoclay’ based on Langmuir, Freundlich, Brunauer-Emmett-Teller (BET), and Dubinin-Radushkevich (D‒R) isothermal models. The ‘nanoclay’ was separated using US Patent No. US2010/0187474 A1 procedure that was modified in this study with addition of HCl treatment. The results showed that after 48 h equilibration, application of Langmuir and D‒R model resulted adsorption capacity (qe para-meter) of 460.78 (two-sites) and 439.66 mg.g-1 (heterogeneous sites), respectively, while BET and Freundlich model resulted respectively adsorption at the first adsorptive layer (qmono parameter) of 111.11 mg.g-1 (multilayers) and adsorption constant (1/n parameter) of 0.28. The later indicated that the studied ‘nanoclay’ was a high-quality adsorbent (1/n value 0.1-0.5). Limitations and advantages application of each model were discussed. However, Langmuir showed the best performance in term of linear equations with the highest R2 values obtained.

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A Review on the Use of Nanoclay Adsorbents in Environmental Pollution Control

Cited by 17 publications

References 84 publications

Mg–Al LDH nanosheets as a nanotechnological tool in agriculture: an exploratory toxicity evaluation study

Mg–Al LDH nanosheets as a nanotechnological tool in agriculture: an exploratory toxicity evaluation study

Fe3O4-Halloysite Nanotube Composites as Sustainable Adsorbents: Efficiency in Ofloxacin Removal from Polluted Waters and Ecotoxicity

Phosphate adsorption characteristics of ‘nanoclay’ separated from Indonesian volcanic tuffs

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