Synthesis of Al-containing mesoporous silica (KSW-2) with semi-squared channels by incorporation of Al into the framework of kanemiteElectronic supplementary information (ESI) available: powder XRD patterns and 29Si MAS NMR spectra of kanemite and Al-kanemite, N2 adsorption isotherm of Al-KSW-2, TEM images of Al-KSW-2. See http://www.rsc.org/suppdata/jm/b2/b211073c/

Abstract

Incorporation of Al into the framework of single-layered silicate kanemite and the formation of Al-containing mesoporous silica (Al-KSW-2) with semi-squared one-dimensional channels were surveyed. Al-containing d-Na 2 Si 2 O 5 was successfully obtained by thermal treatment of an aqueous sodium silicate solution (Na 2 O/SiO 2 ~1 : 2) containing NaAlO 2 up to 785-810 uC, depending on the amount of NaAlO 2 added. After Al-containing d-Na 2 Si 2 O 5 was dispersed in distilled water, Al-containing kanemite (Al-kanemite) was obtained with tetrahedrally coordinated Al. The reaction of Al-kanemite with an aqueous solution of hexadecyltrimethylammonium (C 16 TMA) surfactant yielded a layered C 16 TMA-Al-kanemite complex which was converted to a mesostructured precursor of Al-KSW-2 by mild acid treatment. Tetrahedral coordination of Al was retained in the framework of Al-KSW-2 with high surface area (830 m 2 g 21 ) and uniform semi-squared mesopores (2.7 nm), which increased the adsorption ability for cationic dye molecules. ExperimentalSynthesis of Al-containing d-Na 2 Si 2 O 5 and the conversion to Al-kanemite An aqueous solution of NaOH was added to high-quality water glass (Nissan Chemical Co.) to adjust the Na/Si ratio (Na 2 O : SiO 2 ~1 : 2). Then, an aqueous solution of NaAlO 2 was {Electronic supplementary information (ESI) available: powder XRD patterns and 29 Si MAS NMR spectra of kanemite and Al-kanemite, N 2 adsorption isotherm of Al-KSW-2, TEM images of Al-KSW-2. See

An Approach Toward the Synthesis of Platelike Ordered Mesoporous Materials from Layered Zeolite Precursors

“…The mechanism of formation of KSW-2 is thought to proceed via bending of the individual silicate sheets rather than by their fragmentation. This would explain the unique pore system of this material …”

Design of Molecularly Ordered Framework of Mesoporous Silica with Squared One-Dimensional Channels

“…In addition, as-synthesized metal (e.g., Al, Ti, etc.) containing KSW-2 with molecularly ordered frameworks can also be obtained through the development of synthetic procedures for incorporating metal species in the framework of kanemite. − By the combination of these methods, organically and inorganically designed KSW-2-based mesoporous silicas can be synthesized, which will provide a number of unique functions.…”

Sílicas mesoporosas e silicatos lamelares contendo agentes organofuncionalizados

“…A estrutura básica dos filossilicatos é bidimensional (2D) e baseia-se em anéis de seis membros interligados composto por tetraedros (SiO 4 ) 4-. Três dos quatro oxigênios de cada tetraedro são compartilhados com outros adjacentes, formando assim uma unidade composta por (Si 2 O 5 ) [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]19 . Existem dois tipos de folhas, a folha octaédrica e a tetraédrica, designadas por O e T, respectivamente.…”