Preparation and characterization of a new layered double hydroxide, Co–Zr–Si

Saber, Osama

doi:10.1016/j.jcis.2005.10.010

Cited by 14 publications

(12 citation statements)

References 49 publications

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“…(2), which show them (the white points are molecules) distributed throughout the specific area. Agreeing with our previous work [23], the white points found in the Zn chart are located in similar positions to those of the white points found in the Al and Si charts, although more Zn molecules are found in the chart than Si and Al charts. This agrees with the schematic representation of Zn-Al-Si LDH which mentions later and indicates that the different elements are homogeneously distributed in the LDH at the micrometer scale.…”

Section: Energy-dispersive X-ray Spectrometry Of Zn-al-si Ldhsupporting

confidence: 88%

“…The weak bands observed around 1035 cm -1 for Zn-Al-Si LDH can be ascribed to the 1 mode of carbonate. Although this band is IR-inactive in the free carbonate [23], it becomes activated in the samples ZA(7)S(7), ZA(15)S(10), ZA(15)S (15) and ZA (20)S (20) owing to the lowering of the symmetry of carbonate anions in the interlayer region, which is also responsible for the splitting of 3 band [32]. This band is also observed in Zn-Al LDH as a weak shoulder at 1033 cm -1 .…”

Section: Ft-ir Spectroscopymentioning

confidence: 92%

“…Typically, appropriate amounts of sodium salts of organic acids (n-capric and suberic acid) were dissolved in 10 ml of deionizeddistilled water (concentration about 0.1~ 0.2 M) with ultrasonic treatment [23][24][25]. The LDH (0.24 g) were mixed with the solution of organic acid under argon gas and stirred at 60 °C for 6 h or at room temperature for 72 h. After filtration and washing, the samples were dried under vacuum at room temperature.…”

Section: Intercalationmentioning

confidence: 99%

“…The FT-IR technique has been used to identify the nature and symmetry of interlayer anions [23]. Fig.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

“…Recently, we reported that the preparation of Zn-Ti LDH, Zn-Al-Ti LDH, Co-Ti LDH and Co-Zr-Si LDH consisting of di-and tetra-valent cations is possible [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Preparation, Characterization and Intercalation Reactions of New Nano-Ordered Layered Materials, Zn-Al-Si LDH

Saber

2011

CNANO

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Layered double hydroxides (LDHs) and anionic clay are nano-ordered layered compounds and are well known for their ability to intercalate anionic compounds. Most LDHs are prepared conventionally only with di-and tri-valent cations. Alumina-silicate structures are very familiar in the literature as cationic clay or zeolite structure, however, there is no data for alumina-silicate as anionic clay. In this study, a new series of Zn-Al-Si LDHs with various Zn/Al/Si ratios, consisting of di-, tri-, and tetra-valent cations, were prepared and characterized by energy-dispersive X-ray spectrometry (SEM/EDS), X-ray powder diffraction (XRD), infrared spectra (IR), thermal analyses (TG, DTG and DTA), and scanning electron microscopy (SEM). Characterization of the samples containing molar percentages of aluminum and silicon 20~40 % revealed formation of well crystallized phases, layered structures and no excess phases. XRD results and thermal analyses indicated that the carbonate anions have two orientations inside the interlayer region. After intercalation reactions with organic acids, mono-and di-carboxylic acids, the interlayer spacing of Zn-Al-Si LDH increased and organic-inorganic nano-hybrid materials formed. SEM images showed that the morphology of Zn-Al-Si LDH before and after intercalation reactions is plate-like structure. The results presented in this work conclude that the formation of the layer double hydroxide is not limited to the reactions between di-and trivalent cations, although these are the only reactions reported by many researchers.Keywords: Nano structured materials, nano layered materials, new layered double hydroxides, nano hybrid materials, host-guest interactions. INTRODUCTIONNano structured materials are promising materials for a large number of practical applications such as catalysis, adsorption, microelectronics, pharmaceutics, photochemistry, food science, drug delivery, and electrochemistry [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].Layered double metal hydroxides (LDHs) or anionic clays are one of the nano structured materials. The net positive charge, which is due to substitution of trivalent ions by divalent metal ions in the brucite-like metal hydroxide M(OH) 2 , is balanced by an equal negative charge from the interlayer solvated anions. The general formula for these compounds is [MII 1-x MIII x (OH) 2 ] x+ A mx/m .nH 2 O, where MII and MIII are divalent and trivalent cations, respectively, and A m-represents the interlayer anions.Tichit et al. [18] and Das et al. [19] have studied the effect of inclusion of tetravalent metal (Zr) into the hydrotalcite-like structures (Mg/Al) and (Zn/Al). Recently, we reported that the preparation of Zn-Ti LDH, Zn-Al-Ti LDH, Co-Ti LDH and Co-Zr-Si LDH consisting of di-and tetra-valent cations is possible [20][21][22][23].In the field of catalysis, layer compounds which include foreign atoms, ions, or complexes in between the layers are most commonly encountered. Clays and related silicates have attracted most of the attention concerning...

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Section: Energy-dispersive X-ray Spectrometry Of Zn-al-si Ldhsupporting

confidence: 88%

Section: Ft-ir Spectroscopymentioning

confidence: 92%

Section: Intercalationmentioning

confidence: 99%

“…The FT-IR technique has been used to identify the nature and symmetry of interlayer anions [23]. Fig.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

“…Recently, we reported that the preparation of Zn-Ti LDH, Zn-Al-Ti LDH, Co-Ti LDH and Co-Zr-Si LDH consisting of di-and tetra-valent cations is possible [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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