Synthesis and characterization of sol–gel Mg/Al and Ni/Al layered double hydroxides and comparison with co-precipitated samples

Prinetto, F.; Ghiotti, G.; Graffin, Patrick; Tichit, Didier

doi:10.1016/s1387-1811(00)00197-9

Cited by 261 publications

(153 citation statements)

References 35 publications

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“…The sol-gel approach was introduced by Lopez et al [19] to increase the cation ratio. It was further extended to include transition metals Ni, Cr, and CO [20][21][22] thanks to the demonstrated properties of homogeneity, thermal stability, quite good control of stoichiometry, high porosity [23].…”

Section: Sol-gel Methodsmentioning

confidence: 99%

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Richetta¹

2017

J Material Sci Eng

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The peculiar properties of layered Double Hydroxides (LDH) have progressively drawn the attention of the scientific community. The main characteristic of LDH is the ability to capture anionic species (organic and inorganic) to build different composites. This is made possible by the sandwich structure of the LDH, similar to the brucite architecture, made up of positive charged lamellas interspersed by anions. Several distant fields, ranging from medicine to physics and engineering, exhibit interest in LDH applications. To satisfy all those requirements, energy was spent to sculpt LDHs physical and chemical properties and for designing layered double hydroxides "ad hoc" for different needs and employments. Notably, among the many applications, those related to metallurgical processes and products are of particular interest. This paper presents the characteristics, the main preparation routes and reviews the applications of LDH to metallurgy with some examples taken from the experimental research of the author.

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Section: Sol-gel Methodsmentioning

confidence: 99%

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Richetta¹

2017

J Material Sci Eng

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“…Table 1 presents the values of the specific areas, determined by the BET method, of the hydrotalcites calcined at 500°C and the average pore size calculated by the BJH method. As can be observed, the specific surface area decreases as the Mg/Al ratio increases, with the HT-1 catalyst having a specific area of 341.08 m 2 /g and with HT-7 the lowest value of 175.29 m 2 /g, which are highly specific areas in comparison with similar materials synthesized by the coprecipitation method [14]. This decrease in porosity is associated with the lower amount of aluminum in the sheets, which results in a lower accumulation of carbonates and molecules in the interlayer; thus, at the moment of calcination, lower porosity is generated in the solid.…”

Section: Textural Propertiesmentioning

confidence: 78%

Effect of the Mg/Al Ratio on Activated Sol-Gel Hydrotalcites for Photocatalytic Degradation of 2,4,6-Trichlorophenol

Ramos-Ramírez

Ortega

Tzompantzi-Morales

et al. 2017

International Journal of Photoenergy

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Currently, interest has grown in finding effective solutions for the treatment of water pollution by toxic compounds. Some of the latter that have acquired importance are phenols and chlorophenols, due to their employment in the manufacture of pesticides, insecticides, cords of wood, paper industry, among others. The problem is rooted in that these compounds are very persistent in the environment because they are partially biodegradable and cannot be photodegraded directly by sunlight. Chlorophenols are extremely toxic, especially 2,4,6-trichlorophenol, which is potentially carcinogenic. In this work, Mg/Al-mixed oxide catalysts were obtained from the thermal treatment of hydrotalcite-type materials, synthesized by sol-gel method with different Mg/Al ratios. Hydrotalcites and Mg/Al-mixed oxides were physicochemically characterized by X-ray diffraction, thermal analysis (DTA and TGA), and N 2 physisorption. The results were obtained on having proven the photocatalytic degradation of 2,4,6-trichlorophenol as a pollutant model by water. The catalysts obtained present the hydrotalcite phase with thermal evolution until achieving Mg/Al-mixed oxides at 500°C. The catalysts are of mesoporous materials and exhibiting large surface areas. The catalysts demonstrated good photocatalytic activity with good efficiency, reaching degradation percentages with Mg/Al = 1, 2, 4, 5, and 7 ratios of 94.2, 92.5, 86.2, 84.2, and 63.9%, respectively, until achieving mineralization.

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“…A visszaalakulás feltétele, hogy a kalcinálás hőmérséklete ne lépje túl azt a határt (450−600 °C) [185,188], ahol az ún. spinellfázis (MgAl 2 O 4 ) megjelenik [164,171].…”

Section: A Hidrotalcitok Szerkezete éS Tulajdonságaiunclassified

“…A kapott reflexiók megfeleltethetőek a Mg 6 Al 2 (OH) 16 A kapott eredmények megerősítik a mások [185,187,188] által is leírtakat, miszerint az emlékező szerkezetnek köszönhetően vízfelvétellel akár az 500-600 °C-on hőkezelt minta is képes visszaállítani réteges szerkezetét, és hogy az együttes lecsapás módszerével előállított hidrotalcit estén a rehidratálással nő a kristályosság [185].…”

Section: Az Ldh-minták Röntgendiffrakciós Analíziseunclassified

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Synthesis and characterization of sol–gel Mg/Al and Ni/Al layered double hydroxides and comparison with co-precipitated samples

Cited by 261 publications

References 35 publications

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Effect of the Mg/Al Ratio on Activated Sol-Gel Hydrotalcites for Photocatalytic Degradation of 2,4,6-Trichlorophenol

Mikro- és mezopórusos katalizátorok alkalmazása glicerin reaktív desztillációjában

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