Synthesis, cation exchange and dehydration/rehydration of sodium gordaite: NaZn4(OH)6(SO4)Cl·6H2O

Maruyama, Swami Arêa; Krause, Fernanda; Filho, Sergio Rodrigues Tavares; Leitão, Alexandre A.

doi:10.1016/j.clay.2017.05.029

Cited by 17 publications

(7 citation statements)

References 28 publications

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“…After washing with pure water, the intensity of gordaite reflexes slightly decreased, whereas that of namuwite increased. This trend is in agreement with Maruyama et al [39]. They detected small amounts of osakaite (Zn4(SO4)(OH)6·5H2O) in their synthesized residue.…”

Section: Washing the Precipitatessupporting

confidence: 81%

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Influence of Salinity and Pb on the Precipitation of Zn in a Model System

et al. 2018

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Fly ash from solid waste incineration plants is a source of a significant mass flow of Zn-and Pb-containing waste. Acidic leaching removes most heavy metals from fly ash, but leads to high concentrations of soluble salts in the solution, resulting in a saline solution enriched in heavy metals. Common treatment methods cause voluminous sludge that is mostly disposed of as hazardous waste and hence leads to a loss of Zn and other heavy metals. On a laboratory scale, precipitation experiments with 2000 mg/L Zn were performed to investigate the impact of salinity (0 to >70,000 mg/L Cl, 0 to 5400 mg/L SO 4 ) and Pb concentration (0 to 800 mg/L) on the formation of mineral phases. The removal efficiency of Zn and Pb after alkalization of the solution was studied. Characterization of the precipitates showed that salinity has a significant impact on the phases produced. At a low salt concentration, zincite (ZnO) is formed. With increasing salinity, the higher concentration of chloride and sulfate increases the stability of various Zn sulphate hydroxides. At a medium salinity of 7000 mg/L, bechererite is predominantly formed, whereas a higher salinity leads to the formation of gordaite. Addition of low amounts of Pb enlarges the stability field of zincite to medium saline solutions but causes lower removal efficiency. The lower removal efficiency observed at low salinity increases at a higher salinity. In high saline solutions, high Pb concentrations (800 mg/L) are needed to form laurionite, a Pb-hydroxychloride phase.

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Section: Washing the Precipitatessupporting

confidence: 81%

“…Thus, ions such as Pb 2+ can substitute vacancies and may replace Zn 2+ in the structure. Maruyama et al [39] synthesized gordaite and studied the exchange capacity with Ca, K, and Li. They concluded that gordaite has high potential as a cation exchanger layered hydroxide salt.…”

Section: Influence Of Pb (Exp Set 3)mentioning

confidence: 99%

Influence of Salinity and Pb on the Precipitation of Zn in a Model System

et al. 2018

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“…Some authors also have reported the presence or absence of alkaline metals between the layers together with sulfate, like those reported for the minerals, − as well as grafting of sulfate anions to the layers’ surface after mild thermal treatment, generating basal distances in the range of 6.7 to 7.2 Å. , Grafting of sulfate has also been observed in layered hydroxide salts such as sodium gordaite [NaZn 4 (OH) 6 (SO 4 )Cl·6H 2 O] and theresemagnite [NaCo 4 (OH) 6 (SO 4 )Cl.·6H 2 O]. − Khaldi et al reported that when materials were rinsed with sulfate solutions of ammonium or alkaline metals, the structure’s basal spacing changed from 11 Å to 8.9 Å, suggesting that the removal of alkaline metals provokes this reduction of basal distance. Different behavior was observed when sulfate green rusts were washed under similar conditions, in which case the basal distances were maintained almost constant at 11 Å.…”

Section: Introductionmentioning

confidence: 74%

Cation Exchange Reactions in Layered Double Hydroxides Intercalated with Sulfate and Alkaline Cations (A(H₂O)₆)[M²⁺₆Al₃(OH)₁₈(SO₄)₂]·6H₂O (M²⁺ = Mn, Mg, Zn; A⁺ = Li, Na, K)

et al. 2018

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Layered double hydroxides (LDHs) with similar compositions to the minerals shigaite, natroglaucocerinite, and motukoreaite were synthesized by co-precipitation with increasing pH and characterized by several instrumental techniques. These minerals have previously been described to occur only with sodium and sulfate (Na(H2O)6)[M+2 6Al3(OH)18(SO4)2]·6H2O (M2+ = Mn, Mg, and Zn). These phases were synthesized successfully along with others containing lithium and potassium. Cation exchange reactions were performed in the presence of alkaline metal sulfates, and for the first time several instrumental techniques were employed to show that the cations can be totally exchanged without removing the intercalated sulfate anions. This class of compounds, traditionally considered to be anion exchangers, can also be considered cation exchangers, which opens new avenues for future scientific and industrial applications.

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“…The FTIR spectra of the 1:1 phases ( Figure 4) were in agreement with the literature on sulfate intercalated in LDH 9,21 and layered hydroxide salt (LHS), like gordaite. 22 Briefly in the Na-phase, the broad band at 3440 cm -1 is attributed to the stretching of the O-H bonds of the LDH structure and physisorbed/intercalated water molecules. The band at 1654 cm -1 is attributed to the water molecule bending.…”

Section: Resultsmentioning

confidence: 99%

Layered Double Hydroxides with the Composition Mn/Al-SO4-A (A = Li, Na, K; Mn:Al ca. 1:1) as Cation Exchangers

Sotiles¹,

Gomez²,

Silva³

2019

J. Braz. Chem. Soc.

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Hydrated Mn/Al-SO 4 -A (A = Li, Na or K) layered double hydroxides with M 2+ :M 3+ molar ratio close to 1:1 were synthesized by co-precipitation with increasing pH. All phases presented solvated alkali metals and sulfate as intercalated species. In the exchange reactions, when sulfate solutions of alkali metals were used, sodium could be partially replaced by potassium, and the same was true for the potassium phase, where potassium could be partially replaced by Na and Li, without removing the intercalated sulfate anions. This class of compounds, considered to be anion exchanger, can also exchange cations, which opens new perspectives for applications.

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Synthesis, cation exchange and dehydration/rehydration of sodium gordaite: NaZn4(OH)6(SO4)Cl·6H2O

Cited by 17 publications

References 28 publications

Influence of Salinity and Pb on the Precipitation of Zn in a Model System

Influence of Salinity and Pb on the Precipitation of Zn in a Model System

Cation Exchange Reactions in Layered Double Hydroxides Intercalated with Sulfate and Alkaline Cations (A(H₂O)₆)[M²⁺₆Al₃(OH)₁₈(SO₄)₂]·6H₂O (M²⁺ = Mn, Mg, Zn; A⁺ = Li, Na, K)

Layered Double Hydroxides with the Composition Mn/Al-SO4-A (A = Li, Na, K; Mn:Al ca. 1:1) as Cation Exchangers

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Synthesis, cation exchange and dehydration/rehydration of sodium gordaite: NaZn4(OH)6(SO4)Cl·6H2O

Cited by 17 publications

References 28 publications

Influence of Salinity and Pb on the Precipitation of Zn in a Model System

Influence of Salinity and Pb on the Precipitation of Zn in a Model System

Cation Exchange Reactions in Layered Double Hydroxides Intercalated with Sulfate and Alkaline Cations (A(H2O)6)[M2+6Al3(OH)18(SO4)2]·6H2O (M2+ = Mn, Mg, Zn; A+ = Li, Na, K)

Layered Double Hydroxides with the Composition Mn/Al-SO4-A (A = Li, Na, K; Mn:Al ca. 1:1) as Cation Exchangers

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Cation Exchange Reactions in Layered Double Hydroxides Intercalated with Sulfate and Alkaline Cations (A(H₂O)₆)[M²⁺₆Al₃(OH)₁₈(SO₄)₂]·6H₂O (M²⁺ = Mn, Mg, Zn; A⁺ = Li, Na, K)