Mg-Fe layered double hydroxide with chloride intercalated: synthesis, characterization and application for efficient nitrate removal

Santos, Luciane Cavalcante; Silva, Anamália Ferreira da; Lins, Pollyanna Vanessa dos Santos; Duarte, José Leandro da Silva; Ide, Alessandra Honjo; Meili, Lucas

doi:10.1007/s11356-019-07364-4

Cited by 39 publications

(13 citation statements)

References 67 publications

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“…A wide variety of works have focused on evaluating the adsorptive capacity of LDHs against various pollutants such as dyes, drugs, arsenic, rare earth, radioactive substances, phosphate, metals, among other pollutants. Table 1 collects the most important advantages and disadvantages of using LDHs for water treatment compared to other materials [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: General Backgroundmentioning

confidence: 99%

“…Therefore, there is a series of studies in the literature proposing to support LDHs in larger and recalcitrant particles [ 38 , 39 , 40 ]. In addition, in acidic media, the removal capacity of LDHs is compromised due to low structural stability at low pH [ 26 ]. In Table 2 , we collected characteristics of methods of synthesis which can be followed for the preparation of pure LDHs, as well as their composites and hybrids [ 18 , 25 , 41 , 42 ].…”

Section: Ldhs Physicochemical Characteristicsmentioning

confidence: 99%

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Layered Double Hydroxides as Rising-Star Adsorbents for Water Purification: A Brief Discussion

et al. 2022

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Within the frame of this article, briefly but comprehensively, we present the existing knowledge, perspectives, and challenges for the utilization of Layered Double Hydroxides (LDHs) as adsorbents against a plethora of pollutants in aquatic matrixes. The use of LDHs as adsorbents was established by considering their significant physicochemical features, including their textural, structural, morphological, and chemical composition, as well as their method of synthesis, followed by their advantages and disadvantages as remediation media. The utilization of LDHs towards the adsorptive removal of dyes, metals, oxyanions, and emerging pollutants is critically reviewed, while all the reported kinds of interactions that gather the removal are collectively presented. Finally, future perspectives on the topic are discussed. It is expected that this discussion will encourage researchers in the area to seek new ideas for the design, development, and applications of novel LDHs-based nanomaterials as selective adsorbents, and hence to further explore the potential of their utilization also for analytic approaches to detect and monitor various pollutants.

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Section: General Backgroundmentioning

confidence: 99%

Section: Ldhs Physicochemical Characteristicsmentioning

confidence: 99%

Layered Double Hydroxides as Rising-Star Adsorbents for Water Purification: A Brief Discussion

et al. 2022

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“…plots the adsorbed amount (Qt) as a function of (t 1/2 ) for all three samples and shows that the two linear plots do not cross the origin. According to the results, intraparticle diffusion may consists of two steps: step one takes place in the period t 1/2 ˂6 and involves the external diffusion of nitrate molecules to the surface; step two, in the range of 6˂t 1/2 ˂11, consists of the slow adsorption of molecules until equilibrium is reached [71]. The correlation coefficients R 2 and the rate constants (K 3 ) for the intraparticle diffusion were determined by studying the slope of the respective plots.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Synthesis and physicochemical characterization of new calcined layered double hydroxide Mg Zn Co Al-CO3; classical modeling and statistical physics of nitrate adsorption

Elhachmi

Chemat

Chebli

et al. 2022

Inorganic Chemistry Communications

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“…First, the higher pH (.pH pzc ) caused the surface of CLDH negatively charged through deprotonation, resulting in the adverse effect on adsorption due to electrostatic repulsion between the CLDH and nitrate (Karthikeyan & Meenakshi 2019). Second, abundant OH À in strong alkaline conditions will compete with the anion, thus the adsorption for nitrate was inhibited (Santos et al 2020). Overall, strong acidic and alkaline environment was not favorable for the adsorption of nitrate by CLDH.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

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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Mg-Fe layered double hydroxide with chloride intercalated: synthesis, characterization and application for efficient nitrate removal

Cited by 39 publications

References 67 publications

Layered Double Hydroxides as Rising-Star Adsorbents for Water Purification: A Brief Discussion

Layered Double Hydroxides as Rising-Star Adsorbents for Water Purification: A Brief Discussion

Synthesis and physicochemical characterization of new calcined layered double hydroxide Mg Zn Co Al-CO3; classical modeling and statistical physics of nitrate adsorption

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

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