Spectrophotometric Determination of Brilliant blue in Wastewater Following Preconcentration by Solid Phase Microextraction on the Nanoparticles MCM-41 Modified with Schiff base

Colors are the first known contaminants in wastewaters. There are over 100,000 types of dye in the world, such that 7⨯105 tons of these dyes are produced by textile industries every year. Chemical and biological treatment of wastewaters containing these substances is difficult due to low level of adsorption and also chemical stability of dyes. For treatment of dye-containing wastewaters, nonconventional methods are usually used, including adsorption of these compounds by different adsorbents . Brilliant blue FCF used as food dyes in many different products including juices, ice cream, yogurt, jelly and candy. This dye is the synthetic food additives which authorized in very countries. The acceptable daily intake (ADI) values of brilliant blue on milligram per kilogram of body weight per day is 10 . Many methods such as capillary electrophoresis (CE) , differential pulse polarography (DPP) , high-performance ion chromatography (HPIC) ,high-performance liquid chromatography (HPLC) mass spectrometry (MS) spectrophotometry and spectrofluorimetry. were suggested microextraction method for determination of various synthetic dyes.In this study, the magnetic nanoparticle MCM-41 fuctionalized with Schiff base, was synthesized and characterized as a new sorbent. Various techniques including fourier transform infrared spectroscopy (FT-IR(, X-Ray Diffraction (XRD) and BET were used for characterization of mesopprous. . This magnetic mesoporous, as a new solid phase was used for preconcentration of brilliant blue dye in microextraction method. The preconcentrated dye was determined by spectrophotometric method. The effective parameters on the extraction efficiency including, adsorbent dose, pH, contact time and volume of eluant according to central composite design (CCD) were investigated and optimized. Then, in the optimal conditions, the calibration curve of method was plotted and it was linear at the range of 10 – 0.750 n??−1. The preconcentration factor including preconcentration factor and the detection limit were 67 and 0.753 n??−1 respectively. The effect of some external species including dye, cation and anions were investigated. The method was successfully applied to determined Methyl green dye in several water samples including Yasouj tap water and Cheshmeh Mishi water.