Amino Acid Ionic liquid Coated Magnetic Core Fe3O4@SiO2 Nanoparticles Coupled with UV Spectrophotometry for the Separation /Analysis Congo Red

Abstract

Congo red (diphenyl-4,4'-(azo-2-)2-1-amino naphthalene-4-sodium sulfonate, CR) is a kind of benzidine anionic dyes. It is commonly used as biological stain and chemical indicator. CR is not edible pigment which is not allowed to add into food because it has good stability and cannot be biodegradable which causes serious harm to aquatic organisms and food web [1]. CR causes also the human body dyspnea, emesis, diarrhea and nausea and its metabolites benzidine has toxic and carcinogenic to the human body [2]. CR is used in the textile, printing and dyeing, paper, rubber and plastics industry, the use of congo red staining process needs to consume large amounts of water, so it polluted water [3]. At the same time, congo red has strong tinting strength, low price that it was used in meat dyeing. Therefore, it is very important to establish an accurate and sensitive method for separation of congo red in drinking water and beverages.