Tracked changes of dolomite into Ca-Mg-Al layered double hydroxide

Mao, Ning; Zhou, Chun Hui; Keeling, John; Fiore, Saverio; Zhang, Hao; Chen, Liang; Jin, Gui Chen; Zhu, Ting; Tong, Dong Shen; Yu, Wei

doi:10.1016/j.clay.2017.06.011

Cited by 27 publications

(6 citation statements)

References 70 publications

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“…Layered double hydroxides (LDHs) are well-known, charged, inorganic layered compounds with exchangeable interlayer anions. In particular, LDHs based on Mg and Al have long shown promise for applications in materials science, catalysis, environmental science, polymer science, medicine, and pharmaceutical science. − Recently, LDH nanosheets, which can be prepared by exfoliation of bulk LDH crystals with formamide, have attracted attention as components of nanostructured functional materials. − One of the typical LDHs has the formula of [Mg 2/3 Al 1/3 (OH) 2 ](A n – ) 1/3 n · m H 2 O, where A is an exchangeable anion such as halide, nitrate, sulfate, or carbonate, n is the anion charge, and m is the hydration number. The abbreviated formula may be written as A n – -MgAl(1/3)LDH.…”

Section: Introductionmentioning

confidence: 99%

Why Do Carbonate Anions Have Extremely High Stability in the Interlayer Space of Layered Double Hydroxides? Case Study of Layered Double Hydroxide Consisting of Mg and Al (Mg/Al = 2)

et al. 2019

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Layered double hydroxides (LDHs) are promising compounds in a wide range of fields. However, exchange of CO 3 2− anions with other anions is necessary, because the CO 3 2− anions are strongly affixed in the LDH interlayer space. To elucidate the reason for the extremely high stability of CO 3 2− anions intercalated in LDHs, we investigated in detail the chemical states of CO 3 2− anions and hydrated water molecules in the LDH interlayer space by synchrotron radiation X-ray diffraction, solid-state NMR spectroscopy, and Raman spectroscopy. We found the rigidity of the network structure formed between the CO 3 2− anions, hydrated water molecules, and the hydroxyl groups on the metal hydroxide layer surface to be a crucial factor underlying the stability of CO 3 2− anions in the LDH interlayer space.

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Section: Introductionmentioning

confidence: 99%

Why Do Carbonate Anions Have Extremely High Stability in the Interlayer Space of Layered Double Hydroxides? Case Study of Layered Double Hydroxide Consisting of Mg and Al (Mg/Al = 2)

et al. 2019

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“…Therefore, cheaper and widely available metal-bearing substrates are tested for their synthesis. Recently, a few minerals were used as sources of metals; for example, magnesite, dolomite, and kaolinite [22,23,24]. Moreover, in a few reports, LDH phases were synthesized using wastes, such as fly ash [25], furnace slag [26,27], aluminum wastes [28,29], and even brine water [30].…”

Section: Introductionmentioning

confidence: 99%

Removal of Chromates and Sulphates by Mg/Fe LDH and Heterostructured LDH/Halloysite Materials: Efficiency, Selectivity, and Stability of Adsorbents in Single- and Multi-Element Systems

Matusik

Rybka

2019

Materials

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Industrial wastewaters often contain mobile and toxic anions that cannot be removed by precipitation techniques and most known adsorbents. Layered double hydroxides (LDH) are excellent scavengers of anions; however, their use in real applications is of minor importance owing to their swelling behavior and high cost of production. The performed research shows the possibility of obtaining Mg/Fe LDH using natural magnesite. Moreover, heterostructured LDH/halloysite materials were synthesized. The adsorption efficiency of these materials was very high in both single- and multi-element systems, confirming the LDH selectivity. This was with the exception of wastewaters containing a high concentration of chlorides, which clearly hampered the removal of Cr(VI) and S(VI). The measurements indicated that LDH dissolution took place to a small extent (<10 wt%). The LDH/halloysite materials showed lower efficiency than the raw LDH; however, the clay presence has several benefits in terms of future applications: (i) it significantly reduces the pH, especially in contrast to the calcined LDH, which enables the reuse or safe disposal of purified water; (ii) it reduces swelling of the composite, which opens the possibility for applications in column adsorption; (iii) it induces dual adsorption properties through additional cation adsorption; and (iv) it substantially lowers the price of the adsorbent.

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“…The binding energies of 350.7 eV and 73.8 eV could be explained by the existence of O-metal CaO and Al 2 O 3 , respectively [32,33]. In the N 1s XPS spectrum of TM-DTPMP LDH, there was only one peak at 398.4 eV, which was corresponded to C-N in DTPMP molecular [34]. The peak located at 132.8 eV assigned to P 2p could belong to the existence of P-O [35].…”

Section: Chemical Properties Of Tm-dtpmp Ldhsmentioning

confidence: 95%

“…The binding energies of 350.7 eV and 73.8 eV could be explained by the existence of O-metal CaO and Al2O3, respectively [32,33]. In the N 1s XPS spectrum of TM-DTPMP LDH, there was only one peak at 398.4 eV, which was corresponded to C-N in DTPMP molecular [34]. The peak located at 132.8 eV as- As shown in Figure 1b, the FT-IR spectra of TM LDH and TM-DTPMP LDH have absorption peaks at 3454 cm −1 , 3453 cm −1 and 1640, 1645 cm −1 , which were attributed to the O-H band [27].…”

Section: Chemical Properties Of Tm-dtpmp Ldhsmentioning

confidence: 95%

Preparation of a Novel Organic Phosphonic Acid Intercalated Phosphate Tailings Based Hydrotalcite and Its Application in Enhancing Fire Safety for Epoxy Resin

Zhang

Jin

et al. 2022

Polymers

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Phosphate tailings (PTs) are solid waste, which is produced by phosphate flotation. In this work, PTs were used as raw materials for the preparation of diethylenetriamine pentamethronic acid (DTPMP) intercalated trimetal (Ca-Mg-Al) layered double hydroxides (TM-DTPMP LDHs) by co-precipitation method. TM-DTPMP LDHs were characterized by X-ray diffraction, fourier-transform infrared spectroscopy, scanning electron microscopy, differential thermal gravimetric analysis, X-ray photoelectron spectroscopy and applied as a flame retardant to improve the fire safety of epoxy resin (EP). The results showed that the composite materials exhibited obvious layered structure. After intercalation, layer spacing increased from 0.783 to 1.78 Å. When the amount of TM-DTPMP LDH in EP was 8%, the limitted oxygen index of the composite material increased from the original 19.2% to 30.2%. In addition, Cone calorimeter (CC) and Raman spectrum results indicated that with the addition of TM-DTPMP LDHs, the value of heat release rate peak (pHRR) and total heat release (THR) were reduced by more than 43% and 60%, while the value of smoke formation rate (pSPR) and the total smoke production (TSP) decreased nearly 64% and 83%, respectively. The significant reduction in the release of combustion heat and harmful smoke during EP combustion may be attributed to the synergistic flame-retardant effect between hydrotalcite and DTPMP. This work exhibited great potential for the green recycling of PTs and the enhancement of the fire safety of EP.

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Tracked changes of dolomite into Ca-Mg-Al layered double hydroxide

Cited by 27 publications

References 70 publications

Why Do Carbonate Anions Have Extremely High Stability in the Interlayer Space of Layered Double Hydroxides? Case Study of Layered Double Hydroxide Consisting of Mg and Al (Mg/Al = 2)

Why Do Carbonate Anions Have Extremely High Stability in the Interlayer Space of Layered Double Hydroxides? Case Study of Layered Double Hydroxide Consisting of Mg and Al (Mg/Al = 2)

Removal of Chromates and Sulphates by Mg/Fe LDH and Heterostructured LDH/Halloysite Materials: Efficiency, Selectivity, and Stability of Adsorbents in Single- and Multi-Element Systems

Preparation of a Novel Organic Phosphonic Acid Intercalated Phosphate Tailings Based Hydrotalcite and Its Application in Enhancing Fire Safety for Epoxy Resin

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