Abstract
Silica and montmorillonite-supported silica nanoparticles were prepared via an acid one step sol-gel process. The synthesized solids were characterized using XRD, FTIR, TEM and N2 adsorption. The effect of preparing temperatures on the structure and properties of the silica nanoparticles were studied. The results show that the increase of annealing temperature from 25 to 200℃, don’t change amorphous state of silica. While for montmorillonite-supported silica the clay platelets are delaminated during the sol-gel process. TEM results showed that the average particle size of silica is increased by increasing temperature due to the particle sintering and the clay-silica nanoparticles possessed core–shell morphology with diameter of 29 nm. The surface area measurements showed that by increasing annealing temperature the surface area was decreased due to aggregation of particle. The clay-silica sample showed lower average pore width than that of the silica prepared at 200℃ indicating that it has a macropores structure. The adsorption efficiency of the prepared samples was tested by adsorption of protoporphyrin IX. The highest adsorption efficiency was found for SiO2 prepared at 200℃. Temkin model describe the equilibrium of adsorption of protoporphyrin IX on caly-silica nanoparticles under different conditions.
Highlights
Silica nanoparticles have attracted wide interest in view of their excellent optical, electrical and thermal properties
The sol-gel processing technique for the synthesis of silica nanoparticles has been widely used since pore volume and pore size can be controlled at the chemical solution stage [1,2,3,4]
Silica and clay-silica core-shell nanoparticle were fabricated by one-step catalyzed sol-gel method
Summary
Silica nanoparticles have attracted wide interest in view of their excellent optical, electrical and thermal properties. It has been applied in many fields, such as catalysis, cosmetics, paints and drug delivery. Different approaches have been used to prepare silica nanoparticles, including the thermal methods, the sol-gel processing technique and water-in-oil (W/O) microemulsion. The core-shell composite particles have been utilized in a wide range of areas, such as electronics, catalysis and separation. The inorganic samples such as clay minerals have wide applications for a long time, such as catalysts and catalytic supports [13], adsorbents of organic substances and clay based porous. Protoporphyrin IX (PPIX) was used as a candidate to study the adsorption efficiency of the prepared samples
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