Facile Synthesis of Aluminosilicate

The researchers in need of an ordered mesoporous material research for the original synthetic protocols. The material was synthesized by one step solvo-thermal crystallization method under acidic conditions using non ionic surfactant as the template. The material was characterized by small angle PXRD,FTIR, and SEM-EDS.

Though periodic mesoporous silica had been discovered in 1990 1 , or even much earlier 2 , this type of materials did not attract much attention until 1992, upon the publication of two groundbreaking papers 3,4 by a group of Mobil's scientists describing the so-called M41S family of mesoporous silicas.Since then, research on this topic has grown so dramatically that it has developed into a separate field.Remarkable progress has been made in the use of supramolecular templating techniques to synthesize a large variety of periodic inorganic, organic and hybrid mesostructures with tailored framework structures and compositions, pore sizes and architectures, morphologies and surface properties.
Considerable synthesis efforts have been devoted to develop frameworks with pore diameters within the mesoporous range (2-50 nm) because of their possible use as catalysts, host for inclusion compounds and molecular sieves 5 .Use of the nanosized pores of such host materials to confine the growth of guest materials (semiconductors, metals or compounds) has been widely adopted as an attractive method 6 .The dependence of physical properties of materials on their grain size is a well known phenomenon 7,8 .Due to their small size (1-100 nm), nanoparticles exhibit novel material properties.However, the engineering of materials on the nanometer scale requires new appropriate synthesis approaches which can provide an effective way of controlling the uniformity of particle sizes and prevent agglomeration of the particles.
Another important discovery is the use of ordered nanoporous silica and colloidal crystals to create new periodic mesoporous and macroporous materials, including carbons, polymers, metals, and alloys.Combination of different synthesis approaches such as amphiphile, colloidal crystal or microemulsion templating, micro molding and soft lithography led to materials with hierarchically ordered structures.Significant effort was also devoted to the development of potential applications in adsorption, catalysis, separation, environmental cleanup, drug delivery, sensing and optoelectronics.

Material Synthesis
Ordered mesoporous aluminium silicate was prepared by a combination of surfactant templating, solvo-thermal method, in which nonylphenol was used as a structure-directing agent; anhydrous aluminum chloride and sodium silicate acted as inorganic precursors.In additional mineral acid was added to the synthesis mixture to prevent hydrolysis reaction.
As following, 6.83 g of anhydrous aluminum chloride was added to a 50 ml of de-ionsed water and 6.29 g of sodium silicate under vigorous stirring.When the solution became clear, 4 ml of nonylphenol was added under stirring into the above solution.The mixture was further stirred for 2 to 2.5 h at 140°C to 150ºC.Finally white powdered solid washed with deionized water, and dried at 110°C.

Characterization
Powder X-ray diffraction measurements were performed in a Bruker D8 Advance diffractometer using Cu Ka radiation of wavelength 0.15405 nm.Samples were finely ground before PXRD experiment.Diffraction data were recorded between 2q = 0.5° to 90° at an interval of 0.02° 2q.Fo u r i e r -t r a n s fo r m i n f r a r e d ( F T I R ) spectroscopic investigation was carried out on a Bruker Vector 22 spectrometer using the KBr pellet.
SEM-EDS electron microscopy images were obtained using a JEOL JSM-6390 SEM operated at 20 kV.Samples for analysis were prepared by spreading them on a holey carbon film supported on a copper grid.Energy dispersive X-ray spectroscopy (EDS) was used to investigate the elemental composition of the silicate.

SEM study of the Aluminosilicate samples
The surface relief of aluminosilicate is highly heterogeneous due to the coexistence of different aluminosilicate phases together with crystalline and amorphous materials.Crystals of various shapes and size, together with amorphous masses, incorporate into friable grains.SEM photos taken from as synthesized sample grains are presented in Fig. 1 to provide typical depictions of all the above mentioned crystal types.A nearly homogeneous matrix which is evidenced apart from the clearly visible crystals is attributed to a mixture of meso crystalline phases and amorphous mass 23 .In EDS data (Table 1) shows the material enriched in Al content and Increasing Al content that increase the hydrophilic character of material.Materials with high concentration of Al increase the selectivity as well as adsorption.FTIR study of the Aluminum silicate samples FTIR spectra can be ver y useful in obtaining information about the structure of zeolite minerals 24,25 .The vibrations in the region 1600-3700 cm -1 can be assigned to the presence of zeolitic water.The isolated OH -stretching (at 3405 cm -1 in the FTIR pattern of synthesized) is attributed to interaction between the water hydroxyl groups present.
The zeolite phases a strong T-O stretching vibration band in the region 1045-1070 cm -1 .In synthesized sample this band appears in 1100 cm -1 .This band is significant for the estimation of aluminum content in the crystalline framework of aluminosilicate, as it depends on the framework nSi/nAl ratio.Band at 1631 cm -1 corresponds to bending vibration of water molecule that is physisorbed in material surface.Band assignment in 950 cm -1 due to condensed AlO 4 and band at 600 cm -1 units for AlO 6 were interlinked together in material.
Small angle powder X-Ray diffraction provides a measurement pore diameter as long as porosity has a long range repetitive order of material conformed high intense peak at 2q > 2°2 6 .

CONCLUSION
The results presented show that we were able to prepare high-quality mesoporous aluminosilicate materials with highly thermal stability.The synthesized material was high Al content increase the activity, number active site and adsorption.As synthesized material better for hydrolysis reaction.
It adsorbs moisture from surroundings, so we can be used as a dehydrant and gas sensor applications.