Dicarboxylic acid cross-linked metal ion decorated bentonite clay and chitosan for fluoride removal studies

Nagaraj, Ammavasi; Pillay, Kriveshini; Sadasivuni, Kishor Kumar; Rajan, Mariappan

doi:10.1039/d0ra00598c

Cited by 18 publications

(4 citation statements)

References 44 publications

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“…The pH value at point of zero charge (pHzpc) for the adsorbents is 7.1 [150] as represented in Figure 15b. When the pH of solution was less than pHzpc, the fluoride ions moved towards the positively charged surface of the chitosan composites formed by the protonation of OH − and carboxylic acid groups leading to the fluoride adsorption onto the surface [151]. At a pH value above the pHzpc, the fluoride adsorption was exceptionally low.…”

Section: Influence Of Ph Valuementioning

confidence: 99%

“…It can be seen from Figure 16c that the adsorption capacity of fluoride ions increased with increase in initial concentration. The initial concentrations improved from 2.0 mg per liter to 10 mg per liter where the adsorption capacity/proficiency of the aluminum bentonite clay-malic acid chitosan (AlBC-A@CS), lanthanum bentonite clay-malic acid chitosan (LaBC-A@CS) and cerium bentonite clay-malic acid chitosan (CeBC-A@CS) adsorbents moved from 70.1% to 98% [151]. Thus, the adsorption limit was observed to be straight forward undertaking related to the adsorption of fluoride ions.…”

Section: Influence Of Initial Ion Concentrationmentioning

confidence: 99%

“…Nitrogen adsorption-desorption isotherm spectrum of cerium bentonite clay-malic acid chitosan (CeBCA@CS) adsorbent. Reproduced with permission from Reference[151]. Open Access 2020, RSC Advances.…”

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confidence: 99%

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Layered Double Hydroxides (LDHs)

2021

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Their exceptional characteristics and uniqueness make Layered Double Hydroxides (LDHs) and their derivatives promising two-dimensional layered materials that are suitable for several existing and future applications in diverse fields. To name a few, we can mention environmental monitoring and preservation, biotechnology, pharmaceutical and chemical processes, the design and realization of new functional polymers and new magnetic materials with a high-saturation magnetic field, and new composite materials for sustainable concrete infrastructure.The number of research and review articles in high-impact journals highlights the growing attention paid to these materials by not only academic, but also applied-science researchers. This is due to the peculiar properties of LDHs, such as their ease of synthesis even on a large scale, their chemical and thermal stability, their uniform distribution of metal cations, and their ability to intercalate anionic species within the interlayer space and possibly release them, together with their high biocompatibility.This growing interest has led to a parallel growth in the number of publications, some of which appear in this Special Issue of Crystals, presenting both research and review papers. In particular, deeper attention has been paid to innovative synthesis techniques, focusing on those with a low environmental impact, to applications for renewable energy sources, and to interlayer anions' exchange capability for drug release. The ability of Layered Double Hydroxides to form hybrid inorganic/organic nanomaterials is stressed in the review articles.We are confident that reading the articles published in this Special Issue, written by accomplished researchers working for years in the field, will be a source of inspiration to any scientist who studies LDHs within any discipline.

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Section: Influence Of Ph Valuementioning

confidence: 99%

Section: Influence Of Initial Ion Concentrationmentioning

confidence: 99%

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Layered Double Hydroxides (LDHs)

2021

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“…Long-term intake of fluoride ions will have a diverse impact on human health depending on their amount and concentration. The formation and maintenance of bones and teeth during childhood will be curtailed by the low concentration of fluoride water (0.5 mg/L) [2,3]. Whereas exposure to a high-fluoride medium might pose a concern to human health, such as fluorosis [4,5].…”

Section: Introductionmentioning

confidence: 99%

Manganese Modified Activated Alumina through Impregnation for Enhanced Adsorption Capacity of Fluoride Ions

Gao

You

et al. 2022

Water

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Activated alumina, with low cost to implement and consistent performance, has been widely used as a defluoridation adsorbent in contaminated groundwater. However, its application was hampered by an undesirable adsorption capacity. In the recent research, an innovative adsorbent (manganese modified activated alumina, MAA) was synthesized by impregnation method and showed a more significant adsorption capacity than that of freshly activated alumina. The scanning electron microscope, Brunauer, Emmett and Teller, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared verified introduction of manganese oxides (MnOOH and MnO2) successfully, improvement of surface microstructure and nature of single-layer adsorption, which enhanced the adsorption ability. In a short period of adsorption, the MAA maximum capacity increased from 38% to 67%. Then, batch-scale kinetic and thermodynamic adsorption investigations were performed. The high correlation coefficients R2 (close to 1) of the quasi-second-order model, Langmuir kinetic model, and Langmuir isotherm model confirmed a better fit to the adsorption experimental data, further indicating that the diffusion of adsorbate was primarily governed by adsorption onto the active sites and the adsorption of fluoride on MAA was single-layer physical adsorption. This paper provides an approach to modifying activated alumina as a groundwater fluoride adsorbent.

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Synthesis and Modification Strategies of Chitosan and Its Interaction with Metal Ions

Prabhu

Meenakshi

2021

Advances in Polymer Science

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Dicarboxylic acid cross-linked metal ion decorated bentonite clay and chitosan for fluoride removal studies

Abstract: The adsorbent CeBC-A@CS nanocomposite has the maximum fluoride adsorption capacity.

Cited by 18 publications

References 44 publications

Layered Double Hydroxides (LDHs)

Layered Double Hydroxides (LDHs)

Manganese Modified Activated Alumina through Impregnation for Enhanced Adsorption Capacity of Fluoride Ions

Synthesis and Modification Strategies of Chitosan and Its Interaction with Metal Ions

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