Y. Über Davyn und seine Beziehungen zu Hauyn und Cancrinit

Goßner, B.; Mussgnug, Florian

doi:10.1524/zkri.1930.73.1.52

Cited by 13 publications

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“…The sodalite framework is formed by ABC stacking of layers of not directly connected (AlSiO 4 ) 3 -rings along [111] as in cubic closest package. The cancrinite structure exhibits the AB stacking of the same layers parallel [0001] known from hexagonal closest package [22]- [27]. Random stacking between both sequences results in the structure of INT and as a consequence of this disorder the X-ray powder pattern of the intermediate phase shows only the reflections that sodalite and cancrinite have in common [20] [21] as can be seen in the patterns of Figure 1.…”

Section: Naoh (M)mentioning

confidence: 98%

Zeolite Synthesis under Insertion of Silica Rich Filtration Residues from Industrial Wastewater Reconditioning

Hartmann¹,

Petrov²,

Buhl³

et al. 2014

ACES

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Zeolite synthesis was studied using two silica rich filtration residues (FR 1 and FR 2) as Si-source and sodium aluminate in a direct synthesis at 60˚C at strong alkaline conditions (8 M-16 M NaOH). In addition to these one-pot syntheses, a two-step process was investigated. Here, an alkaline digestion of FR at 60˚C was followed by gel precipitation with sodium aluminate and gel crystallization under usual conditions of 80˚C-90˚C. The results show that the substitution of chemical reagent sodium silicate by a waste material like FR as Si-source is possible but requires fine tuning of the reaction conditions as zeolite crystallization is a process under kinetic control. The solubility behaviour and impurities of the inserted filtration residues strongly influenced the course of reaction. Thus zeolites like hydrosodalite or intermediate zeolite between cancrinite and sodalite, or zeolite NaA or Z-21 in cocrystallization with hydrosodalite could be observed in the one pot syntheses already in a short time interval between 1-4 h depending on the alkalinity. The two step process yield to zeolites NaA and NaX in very good quality. The reaction process of FR in both reaction methods was characterized by chemical analyses, X-ray powder diffraction, Fourier transform infrared spectroscopy as well as scanning electron microscopy. Surface area and water content of selected products were further characterized by the BET-method and by thermogravimetry. Summing up the results, we can show that zeolite formation from filtration residues is possible by several reaction procedures as model cases for a re-use of industrial waste materials. Beside the importance for environmental protection, the reactions are of interest for zeolite chemistry as the re-use of FR is possible under economically conditions of low energy consumption at 60˚C and short reaction periods.

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Section: Naoh (M)mentioning

confidence: 98%

Zeolite Synthesis under Insertion of Silica Rich Filtration Residues from Industrial Wastewater Reconditioning

Hartmann¹,

Petrov²,

Buhl³

et al. 2014

ACES

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“…Among the various zeolites − which possesses adsorbent properties, cancrinite appears to be one of the most promising to perform purification of water by removing heavy metals. Cancrinite group (CAN) minerals are framework of aluminosilicate and are characterized by an ordered distribution of Si and Al atoms in the tetrahedral sites. , The cancrinite contains small ε-cage made of six membered rings and wide channels containing 12 membered rings in an ABAB type stacking sequence − in the space group P6 3 . The cancrinite cage is composed of two parallel 6-ring windows perpendicular to the c -axis, bound by 6-ring and 4-ring windows (Figure ).…”

Section: Introductionmentioning

confidence: 99%

Removal of Heavy Metals Cd²⁺, Pb²⁺, and Ni²⁺ From Aqueous Solutions Using Synthesized Azide Cancrinite, Na₈[AlSiO₄]₆(N₃)_2.4(H₂O)_4.6

Borhade¹,

Kshirsagar²,

Dholi³

et al. 2015

J. Chem. Eng. Data

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A l u m i n o s i l i c a t e a z i d e c a n c r i n i t e , Na 8 [AlSiO 4 ] 6 (N 3 ) 2.4 (H 2 O) 4.6 , has been prepared for the first time from zeolite-A, followed by hydrothermal processing at low temperature. After crystallization, the sample was characterized by appropriate physicochemical techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), thermal gravimetric analysis (TGA), and Brunauer− Emmett−Teller (BET) surface area. In the present study, attention was focused on investigating the removal performance of heavy metal ions (Cd 2+ , Pb 2+ , and Ni 2+ ) in aqueous solution on pure aluminosilicate azide cancrinite. The kinetics of the process and sorption capacity of the adsorbent was determined in relation to the effect of various factors affecting on the adsorption process. The parameters in this study included contact time, metal ion concentration, temperature, and adsorbent dosage. The removal mechanism of metal ions followed adsorption and ion exchange process. Adsorption data has been interpreted in terms of Langmuir and Freundlich equations. The selectivity of the studied metal ions was determined as Pb 2+ > Cd 2+ > Ni 2+ . Thermodynamic parameters, i.e., equilibrium constant (K c ), free energy (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) for adsorption, were computed from the experimental data.

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“…On regarding these layers the structures can be described with the stacking of closest-packing spheres yielding to cubic symmetry of the framework due to an ABC sequence of stacking and to the hexagonal symmetry in the case of AB, respectively. The general structures of these two phases were already proposed by Pauling in 1930 [2] and Gossner & Mussgnug [3] and were later refined by Lo Èns and Schulz [4] (sodalite) as well as Jarchow [5] and Grundy & Hassan [6] (cancrinite).…”

Section: Introductionmentioning

confidence: 99%

Structure and spectroscopic properties of hydrogencarbonate containing alumosilicate sodalite and cancrinite

Gesing¹,

Buhl²

2000

Zeitschrift Für Kristallographie - Crystalline Materials

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The preparation of the sodalite Na 8 [AlSiO 4 ] 6 Á (HCO 3 ) 1 (CO 3 ) 0.5 (H 2 O) 2 and cancrinite Na 7.6 [AlSiO 4 ] 6 Á (HCO 3 ) 1.2 (CO 3 ) 0.2 (H 2 O) 2 were carried out in a coldsealed autoclave using a preheated mixture of g-Al 2 O 3 and precipitated silica together with NaHCO 3 and NaOH. The material was encapsulated in a small silver tube and heated for 48 hours at a pressure of 0.1 GPa. Two different types of crystals remained during this process. From these crystals the structure of both compounds were determined from single crystal diffractometer data. The sodalite Na 8 [AlSiO 4 ] 6 (HCO 3 ) 1 (CO 3 ) 0.5 (H 2 O) 2 : P 43n, a 903.3(1) pm, V 0.7370(1) nm 3 , Z 2, R 0.013, wR 2 0.027 for 242 structure factors and 63 variable positional parameters; the cancrinite Na 7.6 [AlSiO 4 ] 6 Á (HCO 3 ) 1.2 (CO 3 ) 0.2 (H 2 O) 2 : P6 3 , a 1272.5(2) pm, c 517.7(1) pm, V 0.7260(1) nm 3 , Z 2, R 0.034, wR 2 0.066 for 845 F's and 99 variables. Spectroscopic properties were measured with an IR microscope in transmission mode using single crystals polished to a thickness of 30 mm. Both structures are build by corner shared six rings of AlO 4 and SiO 4 tetrahedra stacked cubic close packed ABCA H B H C H for the sodalite and hexagonal close packed ABA H B H for the cancrinite. The mean Al± ±O (174.3 pm) and Si± ±O (161.4 pm) distances for the sodalite and 173.7 pm (Al± ±O) and 161.8 pm (Si± ±O) are in good agreement with former structure description of related materials. Hydrogencarbonate and carbonate was found statistically distributed in the sodalite b-cages and in the channels of the cancrinite structure. Whereas for the sodium atoms in the sodalite four different positions are observed, the sodium atoms in the cancrinite structure where found near the threefold axes in the cancrinite e-cage and on one position in the channel.

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Y. Über Davyn und seine Beziehungen zu Hauyn und Cancrinit

Cited by 13 publications

References 0 publications

Zeolite Synthesis under Insertion of Silica Rich Filtration Residues from Industrial Wastewater Reconditioning

Zeolite Synthesis under Insertion of Silica Rich Filtration Residues from Industrial Wastewater Reconditioning

Removal of Heavy Metals Cd²⁺, Pb²⁺, and Ni²⁺ From Aqueous Solutions Using Synthesized Azide Cancrinite, Na₈[AlSiO₄]₆(N₃)_2.4(H₂O)_4.6

Structure and spectroscopic properties of hydrogencarbonate containing alumosilicate sodalite and cancrinite

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Y. Über Davyn und seine Beziehungen zu Hauyn und Cancrinit

Cited by 13 publications

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Zeolite Synthesis under Insertion of Silica Rich Filtration Residues from Industrial Wastewater Reconditioning

Zeolite Synthesis under Insertion of Silica Rich Filtration Residues from Industrial Wastewater Reconditioning

Removal of Heavy Metals Cd2+, Pb2+, and Ni2+ From Aqueous Solutions Using Synthesized Azide Cancrinite, Na8[AlSiO4]6(N3)2.4(H2O)4.6

Structure and spectroscopic properties of hydrogencarbonate containing alumosilicate sodalite and cancrinite

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Removal of Heavy Metals Cd²⁺, Pb²⁺, and Ni²⁺ From Aqueous Solutions Using Synthesized Azide Cancrinite, Na₈[AlSiO₄]₆(N₃)_2.4(H₂O)_4.6