Application Of Magnetic Nanoparticles To Determination And Remove Organic Dye Pollutants

Food safety issues are closely related to our daily life and dyes from textile printing and dyeing industry have caused a series of serious pollution of our environment. Sudan dyes are a family of lipophilic azo dyes, extensively used in industrial and scientific applications but banned for use as food colorants due to their carcinogenicity. But there have been a large number of cases where Sudan dyes have been found in food. Methlene blue is a common aromatic heterocycle cationic dye, which is harmful to human health although not having a strong toxicity. Crystal violet is a triphenylmethane-based cationic dyes and widely used in the textile dyeing and paper printing. Crystal violet, that is carcinogenic and difficult to microbial degradation, can exist in a variety of environmental conditions. We employed Fe3O4magnetic nanoparticles、 Fe3O4@Fuller’s earth magnetic nanocomposites and Fe3O4/HA magnetic nanoparticles for determination of Sudan dyes and removal of methylene blue and crystal violet.(1) Fe3O4magnetic nanoparticles were successfully synthesized and characterized by XRD, TEM. VSM, Zeta potential and used to dispersion solid phase extraction of Sudan dyes from food and water samples coupled with high-performance liquid chromatography. The effect of Desorption conditions, sample solution pH, contact time, adsorbent amounts, solution volume, ionic strength and other co-existing substances were investagated in detail. Also, under the selected conditions, some parameters such as linearity, precision and limits of detection of the proposed method were investigated. The results indicated that the as-prepared Fe3O4magnetic nanoparticles material showed good characteristics, such as simple. fast and easy separation. They can be recovered effectively and can be put into cyclic use. Moreover, the as-prepared Fe3O4magnetic nanoparticles adsorbent could remove the potential matrix interference and preconcentrate the four Sudan dyes rapidly and effectively. This proposed analytical method can be for estimation of Sudan dyes in water samples and monitoring the illegal addition of Sudan dyes in foods.(2) Fe3O4@Fuller’s earth magnetic nanocomposites were synthesized and characterized by TEM、FT-IR、VSM、Zeta potential. The magnetic nanocomposites were used as adsorbent for the removal of MB dye from water. The effect of Fuller’s earth amounts, pH, temperature, ionic strength, adsorption kinetics and isotherms of MB were investagated in detail. The results indicated that Fe3O4@Fuller’s earth magnetic nanocomposites could effectively remove MB. The adsorption of MB onto Fe3O4@Fuller’s earth magnetic nanocomposites fitted well with the Langmuir model. The maximum adsorption capacity of MB was224.22mg/g. Moreover, the adsorption kinetics of MB was found to follow pseudo-second-order kinetic model. Fe3O4@Fuller’s earth magnetic nanocomposites could be easily separated under the external magnetic field. The as-prepared magnetic nanocomposites could be used as an excellent adsorbent for dye removal from wastewater.(3) Fe3O4/HA magnetic nanocomposites were synthesized and characterized by TEM、FT-IR、 VSM、 Zeta potential. The magnetic nanocomposites were used as adsorbent for the removal of CV dye from water. The effect of sodium humate amounts, pH, temperature, ionic strength, adsorption kinetics and isotherms of CV were investagated in detail. The results indicated that Fe3O4/HA magnetic nanocomposites could effectively remove CV. The adsorption of CV onto Fe3O4/HA magnetic nanocomposites fitted well with the Langmuir model. The maximum adsorption capacity of CV was145.56mg/g. Moreover, the adsorption kinetics of CV was found to follow pseudo-second-order kinetic model. Fe3O4/HA magnetic nanocomposites could be reused and easily separated under the external magnetic field. Our results indicated that the as-prepared magnetic nanocomposites could be used as an excellent adsorbent for dye removal from wastewater.