Kinetic, thermodynamic and isotherm investigations of Cu2+ and Zn2+ adsorption on Li Al hydrotalcite-like compound

Zhao, Lei; Liang, Jiling; Li, Na; Xiao, Hua; Chen, Li-Zong; Zhao, Ru-Song

doi:10.1016/j.scitotenv.2020.137120

Cited by 41 publications

(23 citation statements)

References 47 publications

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“…Among them, hierarchical sphere LDH has attracted much attention due to its porous structure and structural stability, which are beneficial to the absorption of heavy metal ions [45]. LDH hierarchical sphere composed of crosslinked nanosheets is synthesized by the hydrothermal method, which is a low-cost and simple technology method [46,47]. The structure of calcined layered double hydroxide (CLDH) prepared by calcining hierarchical sphere LDH was not changed, showing 99% removal of As 6+ and Cr 6+ in 5 min.…”

Section: Shape and Sizementioning

confidence: 99%

Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

Tang

Qiu

Lü

et al. 2020

Nanotechnology Reviews

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The use of functional material can help mitigate the pollution by heavy metals, which presents an array of risks to human production and life. This work provides a comprehensive review of the current knowledge on functionalized layered double hydroxide (LDH) as a heavy metal absorption material, by synthesizing the information from a total of 141 relevant publications published since 2005. LDH provides a potentially highly efficient method to adsorb heavy metal ions, which is simple to prepare and of low cost. The lack of functional groups and structural components of pristine LDH, however, limits the absorption capacity and widespread applications of LDH. Through intercalation, surface modification, or loading on substrates, functional groups or structural components are introduced into the pristine LDH to prepare functionalized LDH. In this process, the hydroxyl group and the valence state of [Mg(OH)6] octahedrons play a crucial role. Functionalized LDH can be endowed with selective absorption capacity and enhanced stability and recyclability. After adsorbing heavy metal ions, functionalized LDH can be readily separated from the liquid phase. These aspects are discussed, along with the structure and composition, shape and size, and synthesis methods and research tools of LDH. This work concludes with the discussion of preparation and utilization and a look to the future in terms of identified research needs regarding the preparation, use, and recycling (or upcycling) of economical and environmental-friendly LDH.

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Section: Shape and Sizementioning

confidence: 99%

Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

Tang

Qiu

Lü

et al. 2020

Nanotechnology Reviews

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“…As aforementioned in Section 1, the morphology of LDH strongly depended on the synthesis process and the nature of used metal salts. Different morphologies of LDH were observed in the literature such as the morphology like sheet [22], nanofoil [11], 3D hierarchically flower [12,18], and interconnecting flower [20]. To some extent, the morphological property of LDH has a less impact on its adsorption capacity compared to the others (i.e., its surface area and charge).…”

Section: Resultsmentioning

confidence: 99%

“…CdCO 3 ) has been acknowledged in the literature. Such cationic metals include Cu 2+ [9,[20][21][22], Zn 2+ [20,22,23], Pb 2+ [14,[22][23][24], Cd 2+ [9,23], Ni 2+ [9], and Eu 3+ [21]. To sum up, LDH can be classified as a "dual-electronic adsorbent" because of its unique structure characterization: positively charged sites on its external surface (high positively ζ potential value) and abundantly exchangeable anions within its interlayer region (high anion exchange capacity).…”

Section: -mentioning

confidence: 99%

Dual-Electronic Nanomaterial (Synthetic Clay) for Effective Removal of Toxic Cationic and Oxyanionic Metal Ions from Water

Nguyen

Ton³

et al. 2020

Journal of Nanomaterials

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A synthetic clay (Mg/Al-layered double hydroxides; LDH) was directly synthesized through a simple coprecipitation method under a low-supersaturation condition. The clay was applied to remove metal cations (Cd2+, Cu2+, Pb2+, Ni2+, and Cr3+) and oxyanions (MnO4– and Cr2O72–) from a single aqueous solution. The result demonstrated that LDH exhibited a poor porosity (its specific surface area and total pore volume: 23.2 m2/g and 0.161 cm3/g, respectively) and positively charged surface within solution pH from 3.0 to 12. The X-ray powder diffraction (XRD) data suggested that the basal spacing of LDH was 0.773 nm. The presence of active CO32– anions in the interlayer region of LDH that played an extremely important role in the adsorption process was identified by XRD and Fourier-transform infrared spectroscopy (FTIR). Energy-dispersive X-ray spectroscopy (SEM) analysis indicated that LDH possessed a surface morphology like a plate with a hexagonal shape. The adsorption isotherms of LDH towards various potentially toxic metals were conducted at 1.0 g/L, pHEquilibrium 5.0, 30°C, and 24 h. The Langmuir maximum adsorption capacity of LDH towards the target metals exhibited the following order: 1.299 mmol/g (for Ni2+ adsorption) > 0.880 mmol/g (Cd2+) > 0.701 mmol/g (Cr3+) > 0.657 mmol/g (Pb2+) > 0.601 mmol/g (Cu2+) > 0.589 mmol/g (Cr2O72–) > 0.522 mmol/g MnO4–. The synthetic clay can adsorb both cations and anions in the solution. Therefore, such LDH material can serve as a potential dual-electronic adsorbent for effectively eliminating various oxyanionic and cationic metal ions from water media.

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“…Therefore, compared to natural cation exchangers with cation-exchange capacities of 0.7 to 1.0 meq g -1 [21,22], hydrotalcite-like compounds generally have a higher ion-exchange capacity. Numerous hydrotalcite-like-compounds have been synthesized so far in order to remove inorganic [13,23,24] or organic impurities [25][26][27][28] in aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

“…Environmental Research & Technology, Vol. 3(1), pp [20][21][22][23][24][25][26][27]. 2020 Engin et al…”

mentioning

confidence: 99%

An investigation on the application of CaII-FeII-FeIII magnetic hydrotalcite-like-compounds for the removal of impurities in aqueous systems

Engin

Erkan

2020

Environmental Research and Technology

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The main aim of this study is to investigate the feasibility of utilizing novel hydrotalcite-like-compounds as ionexchangers for the removal of anionic impurities from aqueous solution. Hydrotalcite is naturally occurring, rarely found anionic clay. It has a positively charged layered structure consisting of two metal oxide layers and an interlayer of carbonate anions. Hydrotalcites can, therefore, be used as ion-exchangers. However, the carbonate anion is highly selected by natural hydrotalcite, making the ion-exchange capacity for other anions very low. In this study, several synthetic hydrotalcite-like compounds and a magnetic hydrotalcite-like compound samples were prepared in order to remove anionic impurities from waters. The physical structure and chemical properties of these anionic clays were characterized using standard characterisation techniques. The removal capacities of the synthetic products obtained were then investigated. Magnetic hydrotalcite-like-compound, namely, CaII-FeII-FeIII, was proved to be a good ionexchanger.

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Kinetic, thermodynamic and isotherm investigations of Cu2+ and Zn2+ adsorption on Li Al hydrotalcite-like compound

Cited by 41 publications

References 47 publications

Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

Dual-Electronic Nanomaterial (Synthetic Clay) for Effective Removal of Toxic Cationic and Oxyanionic Metal Ions from Water

An investigation on the application of CaII-FeII-FeIII magnetic hydrotalcite-like-compounds for the removal of impurities in aqueous systems

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