Synthesis and Characterization of MCM-41 Mesoporous Functionalized with Dipicolinic Acid and Its Application for Preconcentration and Simultaneous Determination of TwoCationic Dyes

Dyes produced by the textile, printing and paper industries can end up in waste waters and are therefore a potential source of pollution of rivers and waterways. Patent blue V used in common food products such as beverages, candies, dairy products, pharmaceuticals and bakery products. Therefore, huge amount of this dye enter and arrive to environment. One of the uses of fuchsin acid is coloration of the cytoplasm and the nucleus and various parts of the tissue in the histology laboratory in order to detect muscle from collagen. It also has important applications in coloring bacteria. The meso-prous silicone material has been considerably appreciated in nano studies due to its ease of preparation and its stable structure. Due to their special structure, these materials easily interact with other groups such as acids, amines, metal nanoparticles, and organic complexes. In this study, MCM-41 mesoporous functionalized with dipicolinic acid (functionalized non-magnetic MCM-41) was synthesized and used as an efficient adsorbent for simultaneous preconcentration of patent blue V and fuchsin acid dyes by solid phase microextraction method. The analytes were determined by spectrophotometric method. Dimethylformamide and hydrochloric acid 4mol.L-1 were chosen as good extraction solvents for patent blue V and fuchsin acid respectively. The effect of effective parameters such as amount of adsorbent, pH, time of stirrer, volume of extraction solvent and ultrasonic bath time according to Taguchi design were investigated and optimized. Under the optimal conditions, the calibration curves were linear at the ranges 0/010 – 0/500mgL-1 and 0/008 – 0/50 MGl−1 for patent blue V and fuchsin acid dyes respectively. The preconcentration factor and enrichment factor for patent blue V were obtained 49/80 and 27/04 respectively and 60/0 and 37/92 for fuchsinacid. The detection limits for patent blue V and fuchsin acid were 0/0020 and 0/030mgL−1 respectively. Also the effect of some foreign species such as dye, cation and anions were investigated. The purposed method was applied to determine of mentioned dyes in different water samples including Yasouj tap water, Tang-e Mehrianwater, and Tang-e Ganjei water.