Hydrothermal synthesis of Mg–Al layered double hydroxides (LDHs) from natural brucite and Al(OH)3

Liao, Libing; Zhao, Ning; Xia, Zhiguo

doi:10.1016/j.materresbull.2012.07.007

Cited by 49 publications

(25 citation statements)

References 14 publications

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“…(2010), Liao et al (2012) and Wang et al (2013). Besides "classical" 3R and 2H polytypes, an exotic 6R modification was described for hydrotalcite based on powder X-ray diffraction patterns (Stanimirova, 2001).…”

Section: Introductionmentioning

confidence: 99%

Crystal chemistry of natural layered double hydroxides. 5. Single-crystal structure refinement of hydrotalcite, [Mg6Al2(OH)16](CO3)(H2O)4

Zhitova

Krivovichev

Pekov

et al. 2018

MinMag

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Hydrotalcite, ideally [Mg6Al2(OH)16](CO3)(H2O)4, was studied in samples from Dypingdal, Snarum, Norway (3R and 2H), Zelentsovskaya pit (2H) and Praskovie–Evgenievskaya pit (2H) (both Southern Urals, Russia), Talnakh, Siberia, Russia (3R), Khibiny, Kola, Russia (3R), and St. Lawrence, New York, USA (3R and 2H). Two polytypes, 3R and 2H (both ‘classical’), were confirmed on the basis of single-crystal and powder X-ray diffraction data. Their chemical composition was studied by electron-microprobe analysis, infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. The crystal structure of hydrotalcite-3R was solved by direct methods in the space group R$ {\bar 3} $m on three crystals (two data collections at 290 K and one at 120 K). The unit-cell parameters are as follows (290/290/120 K): a = 3.0728(9)/3.0626(3)/3.0617(4), c = 23.326(9)/23.313(3)/23.203(3) Å and V = 190.7(1)/189.37(4)/188.36(4) Å3. The crystal structures were refined on the basis of 304/150/101 reflections to R1 = 0.075/0.041/0.038. Hydrotalcite-2H crystallises in the P63/mmc space group; unit-cell parameters for two crystals are (data collection at 290 K and 93 K): a = 3.046(1)/3.0521(9), c = 15.447(6)/15.439(4) Å, V = 124.39(8)/124.55(8) Å3. The crystal structures were refined on the basis of 160/142 reflections to R1 = 0.077/0.059. This paper reports the first single-crystal structure data on hydrotalcite. Hydrotalcite distribution in Nature, diagnostic features, polytypism, interlayer topology and localisation of M2+–M3+ cations within metal hydroxide layers are discussed.

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Section: Introductionmentioning

confidence: 99%

Crystal chemistry of natural layered double hydroxides. 5. Single-crystal structure refinement of hydrotalcite, [Mg6Al2(OH)16](CO3)(H2O)4

Zhitova

Krivovichev

Pekov

et al. 2018

MinMag

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“…When the mass ratio reached 4 : 1, the peak at 11.46° corresponding to the (003) crystalline plate of LDH appeared gradually, but it was quite weak (Liao et al . ). This was due to the low concentration of NaOH.…”

Section: Resultsmentioning

confidence: 97%

“…1(b)-(f) showed the XRD patterns for BR-600 with different mass ratios of boron mud to red mud with 0.5 mol/L NaOH. When the mass ratio reached 4 : 1, the peak at 11.468 corresponding to the (003) crystalline plate of LDH appeared gradually, but it was quite weak (Liao et al 2012). This was due to the low concentration of NaOH.…”

Section: Effects Of the Mass Ratio Of Boron Mud To Red Mudmentioning

confidence: 98%

Preparation of layered double hydroxides using boron mud and red mud industrial wastes and adsorption mechanism to phosphate

Zhang

et al. 2016

Water & Environment J

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Phosphate removal was important for wastewater treatment, and adsorption was an efficient treatment process. In this study, the layered double hydroxide adsorbent (BR‐LDH), which was prepared under alkali conditions using industrial residues boron mud and red mud, was used to adsorb the phosphate. The prepared BR‐LDH was characterised by X‐ray diffraction, Scanning electron microscopy, Energy‐dispersive X‐ray spectroscopy, and Thermo‐gravimetric‐differential thermal analysis. Adsorption experiments were carried out as a function of dosage, contact time, temperature and initial pH of phosphate solution. The removal ratio of phosphate onto OBR‐LDH reached 93%. The adsorption data showed a good compliance with the pseudo‐second‐order kinetic model. In addition, the mineral composition, the functional groups, the valence of elements and zeta potentials of OBR‐LDH before and after adsorption were used to analyse the adsorption mechanism. The result of real wastewater suggested that OBR‐LDH was excellent adsorbent for phosphorus removal from actual wastewater.

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“…Mg(OH) 2 and Al(OH) 3 and NaOH, and Mg 21 and Al 31 were maintained at a certain molar ratio. The Mg(OH) 2 and Al(OH) 3 sols were rinsed until a conductivity of less than 100 ls/cm was obtained.…”

Section: Preparationmentioning

confidence: 99%

Regeneration of anion‐exchange resins with Mg/Al double‐metal hydroxides

Wang

2015

J of Applied Polymer Sci

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Anion-exchange resins (AERs) were regenerated with Mg/Al double-metal hydroxides as the regenerant. Electrical conductivity breakthrough curves were adopted to estimate the relatively rapid regenerative effect of the AERs. The results show that the optimal regenerative effect of AER was obtained when the Mg/Al molar ratio was 3 and the dosages of Mg and Al hydroxides were 0.045 and 0.015 mol, respectively. The highest effluent water yield was obtained at an AER/cation-exchange resin volume ratio of 2:1. Characterization through scanning electron microscopy, X-ray diffraction, and thermogravimetry-differential thermal analysis showed that the regenerant was transformed and exhibited the distinguishing features of Mg/Al layered double hydrotalcites. Cycle experimentation showed that all calcined products effectively regenerated the fouled resins, and the regenerative mechanism was then established.

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Hydrothermal synthesis of Mg–Al layered double hydroxides (LDHs) from natural brucite and Al(OH)3

Cited by 49 publications

References 14 publications

Crystal chemistry of natural layered double hydroxides. 5. Single-crystal structure refinement of hydrotalcite, [Mg6Al2(OH)16](CO3)(H2O)4

Crystal chemistry of natural layered double hydroxides. 5. Single-crystal structure refinement of hydrotalcite, [Mg6Al2(OH)16](CO3)(H2O)4

Preparation of layered double hydroxides using boron mud and red mud industrial wastes and adsorption mechanism to phosphate

Regeneration of anion‐exchange resins with Mg/Al double‐metal hydroxides

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