Adsorption characteristics of assembled and unassembled Ni/Cr layered double hydroxides towards methyl orange

Jiang, Zili; Sun, Fengting; Frost, Ray L.; Ayoko, Godwin A.; Qian, Guangren; Ruan, Xiuxiu

doi:10.1016/j.jcis.2022.03.022

Cited by 15 publications

(11 citation statements)

References 42 publications

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“…When the adsorption site is occupied, no more adsorption occurs at that site ( Jiang et al 2022). The Freundlich model, on the other hand, applies to adsorption that occurs on a heterogeneous surface, and the amount of adsorption is related to the initial concentration of the adsorbent (Jiang et al 2022). This result suggested that the nitrate adsorption in our study may involve multiple processes, and the dominant one may be the heterogeneous multilayer adsorption.…”

Section: Adsorption Isothermmentioning

confidence: 68%

“…The high R 2 indicated that both models were suitable to describe the nitrate adsorption by 3:1 Mg/Fe CLDH, and the adsorption data were slightly better fit to the Freundlich model with a higher R 2 (0.9995) and a lower RMSE (0.465). The Langmuir model assumes that each adsorption site is equal and that adsorption occurs on the homogeneous surface (Jiang et al 2022). When the adsorption site is occupied, no more adsorption occurs at that site ( Jiang et al 2022).…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…The Langmuir model assumes that each adsorption site is equal and that adsorption occurs on the homogeneous surface (Jiang et al 2022). When the adsorption site is occupied, no more adsorption occurs at that site ( Jiang et al 2022). The Freundlich model, on the other hand, applies to adsorption that occurs on a heterogeneous surface, and the amount of adsorption is related to the initial concentration of the adsorbent (Jiang et al 2022).…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…That is, the adsorption of nitrate by 3:1 Mg/Fe was not limited to the external surfaces of the adsorbent, while there was a multilayer surface interaction of the adsorbent and the adsorbate (Karthikeyan & Meenakshi 2020). The parameter of 1/n of the Freundlich model indicates the adsorption performance, and 1/n ranging from 0 to 1 suggests a favorable adsorption ( Jiang et al 2022). The value of 1/n calculated in our study was 0.531, indicating the adsorption of nitrate proceeded readily.…”

Section: Adsorption Isothermmentioning

confidence: 99%

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Adsorption of nitrate from interflow by the Mg/Fe calcined layered double hydroxides

Chu

Zhang

et al. 2022

Water Science and Technology

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Nitrate loss in interflow caused serious nitrate pollution of neighboring water bodies in the purple soil region of China's Sichuan Province. In this study, Mg/Fe(Al)-calcined layered double hydroxides (Mg/Fe(Al)-CLDHs) with varied Mg/Fe(Al) ratios were synthesized for nitrate removal from interflow, and 3:1 Mg/Fe CLDH exhibited the best adsorption performance. The effects of initial pH, adsorbent dosage and co-existing anions on the adsorption performance were investigated by batch experiments. The best-fitting kinetic and isothermal models for nitrate adsorption were the pseudo-second-order model and Freundlich model, respectively, indicating that the adsorption process was a physical-chemical multilayer process. The maximum adsorption capacity of nitrate was 73.36 mg/g, which was higher than that of many other commonly used absorbents. The adsorbents were characterized by XRD, FT-IR, TGA, SEM, TEM and BET techniques, and the XRD and FT-IR results revealed that the adsorption mechanism involved original layered structure reconstruction and ion-exchange interaction. Under the coexistence of SO42− and Cl−, 75.63% nitrate in interflow could be removed after 6 hours of adsorption. Overall, the synthesized Mg/Fe CLDH is an effective and low-cost nitrate absorbent for in-situ nitrate removal.

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Section: Adsorption Isothermmentioning

confidence: 68%

Section: Adsorption Isothermmentioning

confidence: 99%

Section: Adsorption Isothermmentioning

confidence: 99%

Section: Adsorption Isothermmentioning

confidence: 99%

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Adsorption of nitrate from interflow by the Mg/Fe calcined layered double hydroxides

Chu

Zhang

et al. 2022

Water Science and Technology

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“…In addition, recently, this method was carried out, in which the NiCr‐glycine‐LDH was exfoliated in formamide and the LDH nanosheets were obtained. The LDH nanosheets have been utilized as adsorbents to remove dyes from wastewater 43 …”

Section: Top‐down Synthesis: Exfoliation To Nanosheetsmentioning

confidence: 99%

Recent advances in the synthesis of layered double hydroxides nanosheets

Xie

Khalid

2022

Bulletin Korean Chem Soc

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Layered double hydroxide (LDH) with characteristic two-dimensional structure and positive layer charge has attracted attention in a wide range of applications in recent years. Although LDH with a layer-by-layer structure has high applicability as a catalyst, adsorbent, drug reservoir, and so on, it has been suggested that the single-layered LDH nanosheets not only enhance the performance but also expand the application in electrocatalyst, batteries, and supercapacitors due to the increased active sites in nanosheets. In this review, we introduced state of the art in the synthesis of LDH nanosheets in terms of synthesis approaches, mechanisms, and properties of thus obtained LDH nanosheets. The synthesis approaches are primarily categorized into two parts, namely, top-down synthesis to delaminate bulk LDH and bottom-up synthesis to obtain single-layer LDH in limited space. In the first section, the exfoliation of LDH, which was realized by weakening the layer-by-layer stacking and by increasing the basal distance, was summarized mainly based on the swelling mechanism. In the second section, the bottom-up syntheses of LDH nanosheets through controlled crystal growth in confined space or restricted synthetic conditions are introduced.

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Flower-Like Layered Double Hydroxides for the Adsorption of Azocarmine G: Kinetic, Isotherm, and Thermodynamic Studies

Meguellati,

Ghemmit,

Brahimi

2023

Water Air Soil Pollut

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Adsorption characteristics of assembled and unassembled Ni/Cr layered double hydroxides towards methyl orange

Cited by 15 publications

References 42 publications

Adsorption of nitrate from interflow by the Mg/Fe calcined layered double hydroxides

Adsorption of nitrate from interflow by the Mg/Fe calcined layered double hydroxides

Recent advances in the synthesis of layered double hydroxides nanosheets

Flower-Like Layered Double Hydroxides for the Adsorption of Azocarmine G: Kinetic, Isotherm, and Thermodynamic Studies

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