The growth mechanism of hydrotalcite crystal

Jian-song, WU; Wan, JianYu; Wen, LiRong

doi:10.1007/s11431-012-4766-0

Cited by 16 publications

(9 citation statements)

References 5 publications

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“…The SEM study revealed particles with irregular morphology, common to hydrotalcites and related materials synthesized by coprecipitation. 13,54 The mixed chemical composition of sample 3 was also apparent with distinctly different crystal/aggregate morphologies observable.…”

Section: Particle Destabilisationmentioning

confidence: 97%

Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Somosi

Muráth

Nagy

et al. 2019

Environ. Sci.: Water Res. Technol.

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Section: Particle Destabilisationmentioning

confidence: 97%

Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Somosi

Muráth

Nagy

et al. 2019

Environ. Sci.: Water Res. Technol.

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“…The actual values of Cu:Fe ratio are close to those used for precipitation. Phase composition analysis and infrared spectroscopy measurements of as-synthesized hydrotalcite-like materials (Figure S1, Supplementary) exhibit hydrotalcite structure (hexagonal lattice with rhombohedral R3m space group symmetry) [26][27][28]. Characteristic XRD patterns ( Figure S1a, Supplementary) ascribed to network plane (003), (006), (012), (015), (018), (110) and (113) were observed at positions- 13,27,39,25,54,70 and 71 • 2θ, respectively.…”

Section: Characterisation Of Hydrotalcite-like Materialsmentioning

confidence: 99%

Cu-Mg-Fe-O-(Ce) Complex Oxides as Catalysts of Selective Catalytic Oxidation of Ammonia to Dinitrogen (NH3-SCO)

et al. 2020

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Multicomponent oxide systems 800-Cu-Mg-Fe-O and 800-Cu-Mg-Fe-O-Ce were tested as catalysts of selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO) process. Materials were obtained by calcination of hydrotalcite-like compounds at temperature 800 °C. Some catalysts were doped with cerium by the wet impregnation method. Not only simple oxides, but also complex spinel-like phases were formed during calcination. The influence of chemical composition, especially the occurrence of spinel phases, copper loading and impregnation by cerium, were investigated. Materials were characterized by several techniques: X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), low-temperature nitrogen adsorption (BET), cyclic voltammetry (CV), temperature programmed reduction (H2-TPR), UV-vis diffuse reflectance spectroscopy and scanning electron microscopy (SEM). Examined oxides were found to be active as catalysts of selective catalytic oxidation of ammonia with high selectivity to N2 at temperatures above 300 °C. Catalysts with low copper amounts (up to 12 wt %) impregnated by Ce were slightly more active at lower temperatures (up to 350 °C) than non-impregnated samples. However, when an optimal amount of copper (12 wt %) was used, the presence of cerium did not affect catalytic properties. Copper overloading caused a rearrangement of present phases accompanied by the steep changes in reducibility, specific surface area, direct band gap, crystallinity, dispersion of CuO active phase and Cu2+ accessibility leading to the decrease in catalytic activity.

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“…From the general formula for HT, M(II) 1-x M(III) x (OH) 2 (A n− ) x/n mH 2 O [2][3][4][5], the crystal structure of these LDH ( Figure 1) consists of positively-charged brucitetype main sheets which forms an octahedron as a subunit of a layered structure of HT, where partial replacement of divalent M(II) with trivalent metal ion M(III) in the brucite-type structure results in an excess of positive charge, which is compensated in the HT structure by an n-valent anion (A n− ) and x can have values between 0.2 and 0.33. These anions such as carbonate, sulfate and hydroxide (which may also be hydrated) can be introduced between the layers of the crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Rosano-Ortega¹,

Lebrún²,

Oglesby³

et al. 2013

GSC

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In this paper we are describing a green cycle process. The first step was a novel hydrotalcite-like compound (HTLC) synthesized by a co-precipitating method, under standard ambient temperature and pressure, using chemical industry wastewater rich in divalent and trivalent cations, activated by a thermal treatment and finally characterized by scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDS) and thermogravimetric analysis (TGA). The second step was a series of batch sorption tests performed with this activated HTLC and untreated underground sulfurous water from the state of Puebla, México. The HTLC calcined at 500˚C/3 h exhibited the best sorption ability for ions, demonstrated a decrease of the hardness and sulfate ions to below the regional legal standards for drinking water. Once inactive after being used in water treatment, the sorbed ions were removed by ion exchange in a carbonate-containing solution, resulting in an 80% recycling of the material which upon activation demonstrated a retained capacity for water treatment. This recyclability suggests the exciting possibility of this novel compound as an efficient "green" technology in water treatment processes.

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The growth mechanism of hydrotalcite crystal

Cited by 16 publications

References 5 publications

Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Cu-Mg-Fe-O-(Ce) Complex Oxides as Catalysts of Selective Catalytic Oxidation of Ammonia to Dinitrogen (NH3-SCO)

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

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