Adsorptive mitigation of fluoride ions using aluminosilicate adsorbents: A state-of-the-art review

Kumari, Snehlata; Anjitha,; Sengupta, Sonali

doi:10.1016/j.envc.2021.100329

Cited by 7 publications

(4 citation statements)

References 74 publications

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“…56,70 A sharp and clear peak around 535 cm −1 corresponds with Si−O−Al bending vibration, indicating that aluminum oxide is also contained next to silicon oxide. 71,72 The XRD patterns of Ag-NPs/kaolin composite are also shown in Figure 2B. According to previous studies, the diffraction peaks of kaolin found at 2θ = 19.94°, 35.30°, 38.48°, 54.52°, and 62.36°were ascribed to kaolinite.…”

Section: Resultssupporting

confidence: 57%

“…The tiny weak peaks at 2920 cm –1 from the raw kaolin attribute aliphatic hydrocarbon (CH) stretching, indicating an organic impurity, but because of beneficiation, the presence is insignificant. The small peak at 790 cm –1 is attributed to metal impurity bonded with aluminum and hydroxyl (Al-Mg-OH) vibration. , A sharp and clear peak around 535 cm –1 corresponds with Si–O–Al bending vibration, indicating that aluminum oxide is also contained next to silicon oxide. , …”

Section: Resultsmentioning

confidence: 99%

“… 56 , 70 A sharp and clear peak around 535 cm –1 corresponds with Si–O–Al bending vibration, indicating that aluminum oxide is also contained next to silicon oxide. 71 , 72 …”

Section: Resultsmentioning

confidence: 99%

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Kaolin-Supported Silver Nanoparticles as an Effective Catalyst for the Removal of Methylene Blue Dye from Aqueous Solutions

et al. 2022

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Water contamination by organic dyes has become a reason for severe environmental pollution and has been threatening the aquatic ecosystem. In this study, kaolin-supported silver nanoparticle (Ag-NP) composites were synthesized by a facile two-step adsorption−reduction method through the reduction of silver ions adsorbed onto locally available, inexpensive, and easily pretreated kaolin surfaces by using sodium borohydride (NaBH 4 ) for the catalytic degradation of methylene blue (MB) dye in aqueous solution. The morphology, structure, surface area, and interaction of the synthesized materials were investigated by scanning electron microscopy, X-ray diffraction, Brunauer− Emmett−Teller, and Fourier transform infrared spectroscopy, respectively. Characterization results showed the successful growth of Ag-NPs on the kaolin surface. To understand the catalytic degradation performance of the catalyst, batch experiments were carried out using MB dye as a model dye. The catalytic reduction tests confirmed the importance of Ag-NPs and the high catalytic activities of the synthesized Ag-NPs/kaolin composite toward MB dye reduction. The degradation results indicated that the increased Ag-NP content on the kaolin surface through repeating cycles could effectively enhance the removal of MB dye from an aqueous solution. The kinetic analysis of the MB dye degradation of the catalyst has fitted the pseudo-first-order kinetic model. More than 97% removal efficiency was still present after five reuse cycles, demonstrating exceptional stability and reusability of the composite. In conclusion, the Ag-NPs supported kaolin (Ag-NPs/kaolin) composite was found to be a promising catalyst for the excellent catalytic activity to reduce a model dye MB from the aqueous solution in the presence of NaBH 4 with catalytic efficiency higher than 97% and a reduction rate constant, k red , higher than 0.86 min −1 .

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

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Kaolin-Supported Silver Nanoparticles as an Effective Catalyst for the Removal of Methylene Blue Dye from Aqueous Solutions

et al. 2022

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“…In the adsorption technique, natural or synthetic adsorbents must be designed from a variety of materials such as high-valency metals, functionalized sorbents such as carbon-based materials, industrial waste, bio-sorbents, and others, such that the adsorbent's surface can retain the target contaminant via physical or chemical processes [21]. Metal oxides, particularly activated alumina-and other aluminum-based sorbents [17,20,22], are among the most commonly used sorbents for the removal of fluoride and other pollutants from water, including heavy metals and inorganic contaminants. However, there are some drawbacks to alumina-and aluminum-based sorbents' application, such as the use of caustic chemicals during the regeneration process, which causes fouling of the filter bed media, a relatively slow rate of adsorption, and a suboptimal fluoride removal performance under neutral-to-alkaline pH conditions [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Fluoride from Water Using Aluminum-Coated Silica Adsorbents: Comparison of Silica Sand and Microcrystalline Silica

Modaresahmadi,

Khodadoust,

Wescott

2024

Separations

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Two aluminum-coated silica adsorbents were evaluated using silica sand and microcrystalline silica as aluminum-oxide-based adsorbents with different crystalline silica base materials. The aluminum coating contained mainly amorphous aluminum oxides for both aluminum-coated silica adsorbents. The adsorption of fluoride onto both adsorbents was favorable according to the Langmuir and Freundlich adsorption equations, while the physical adsorption of fluoride occurred for both adsorbents according to the Dubinin–Raduskevish (D-R) equation. The adsorption of fluoride was stronger for aluminum-coated silica sand based on adsorption parameters from the Langmuir, Freundlich, and D-R adsorption equations, with the stronger binding of fluoride likely due to the observed greater specific adsorption. The adsorption capacity determined using the Langmuir equation was about 7 times greater for aluminum-coated microcrystalline silica primarily due to the 1.22-orders-of-magnitude-larger surface area of aluminum-coated microcrystalline silica, whereas the surface-normalized adsorption capacity was 2.4 times greater for aluminum-coated silica sand, possibly due to more aluminum being present on the surface of silica sand. Fluoride adsorption occurred over a broad pH range from 3 to 10 for both adsorbents, with nearly the same pHPZC of 9.6, while aluminum-coated microcrystalline silica displayed a higher selectivity for fluoride adsorption from different natural water sources.

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Advances and future perspectives of water defluoridation by adsorption technology: A review

El Messaoudi,

Franco,

Gubernat

et al. 2024

Environmental Research

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Adsorptive mitigation of fluoride ions using aluminosilicate adsorbents: A state-of-the-art review

Cited by 7 publications

References 74 publications

Kaolin-Supported Silver Nanoparticles as an Effective Catalyst for the Removal of Methylene Blue Dye from Aqueous Solutions

Kaolin-Supported Silver Nanoparticles as an Effective Catalyst for the Removal of Methylene Blue Dye from Aqueous Solutions

Adsorption of Fluoride from Water Using Aluminum-Coated Silica Adsorbents: Comparison of Silica Sand and Microcrystalline Silica

Advances and future perspectives of water defluoridation by adsorption technology: A review

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