Pico Level Monitoring of Silver with Modified Hexagonal Mesoporous Compound (MCM-41) and Inductively Coupled Plasma Atomic Emission Spectrometry

Abstract

A rapid method for the extraction and monitoring of picogram level of silver ions using uniform silanized mesopor (MCM-41) modified by a thiocompound and inductively coupled plasma atomic emission spectrometry (ICP-AES) is presented. The preconcentration factor of the method is 500, and detection limit of the technique for silver is 6.5 pg/ml. The time and the efficiency of the extraction, pH and flow rate, type and minimum amount of acid for stripping of silver from modified MCM-41 was tested. The break through volume of the method was found 2500 ml. The maximum capacity the modified MCM-41 was found to be 11.0 ± 1.2 μg of Ag + /mg modified MCM-41.

A novel method for the simple and simultaneous preconcentration of Pb2+, Cu2+and Zn2+ions with aid of diethylenetriamine functionalized SBA-15 nanoporous silica compound

“…The nanoporous silica materials such as MCM-41 [22], LUS-1 [23] and SBA-15 [24] are suitable for application in catalysis [25], modified carbon paste electrodes [26], and micro extraction [27] owing to their high specific surface area, narrow pore size distribution and high concentration of surface hydroxyl groups. Also, there are examples of the use of mesoporous materials for adsorption applications including the removal and preconcentration of metal ions [28][29][30][31][32][33][34][35][36][37], organics [38], dyes [39], radio nuclides [40] and anionic complexes [41,42]. However these examples are limited and further work needs to be done to develop the industrial applications of mesoporous silicates.…”

Highly porous silica‐polyaniline nanocomposite as a novel solid‐phase microextraction fiber coating

“…Mesoporous silica SBA-15, which possesses a large surface area and a tunable pore-size, has been used as a sorbent for the preconcentration of metals [22][23][24] and solidphase microextraction [25]. In order to increase the selectivity and improve the sorption properties of SBA-15 as a coating material for SPME fibers, we used aniline to fabricate SBA-15/polyaniline nanocomposites via chemical polymerization.…”

Synthesis of Carbon Nanotubes Using Metal-Modified Nanoporous Silicas

“…Then attraction of other scientists to this materials caused discovery of other types of nanoporous materials such as SBA-15 (Zhao et al, 1998), LUS-1 (Bonneviot et al, 2003), FSM-16 (Inagaki et al, 1993), KIT-1 (Ryoo et al, 1996), MSU (Bagshaw et al, 1995), and HSM (Tanev & Pinnavaia, 1995)which were synthesized within highly acidic to strongly basic pH range using cationic, anionic, neutral and nonionic structure directing agents. Among these materials, MCM-41, LUS-1 and SBA-15 are most studied ones in our previous researches such as studies on metal modification Béland et al, 1998), pre-concentration of metals (Ganjali et al, 2006;Javanbakht et al, 2009b;Javanbakht et al, 2010), modification with 8-hydroxyquinoline (Badiei et al, 2011b;Badiei et al, 2011a), carbon paste electrodes (Ganjali et al, 2010;Javanbakht et al, 2007a;Javanbakht et al, 2007b;Javanbakht et al, 2009a), solid phase micro extraction (Hashemi et al, 2009) and hydroxylation catalysts (Arab et al). Therefore, these materials are the major subject in the coming discussions about catalytic synthesis of CNTs.…”