Investigating the effectiveness of 2-4 dichlorophenoxyacetic acid toxin removal using the combined method of ultrasonic and N-TiO2@SiO2@Fe3O4 magnetic nanocatalyst from aqueous environments

Abstract

The herbicide2,4 dichlorophenoxyacetic acid can cause diseases such as neurotoxicity, hepatotoxicity, immunotoxicity, teratogenicity, endocrine disruption, hepatotoxicity in the human body. Also, due to their polar properties and relatively good solubility in water, they easily enter water sources after use and pollute water and soil. The use of magnetic nanocomposites is due to their selectivity in absorption, environmental friendliness, stability in environmental conditions, low manufacturing cost, high manufacturing speed, regeneration and reuse capability, and high efficiency of these compounds. This study was conducted with the aim of synthesizing N-TiO2@SiO2@Fe3O4 nanocomposite as a catalyst with ultrasonication to remove 2-4 dichlorophenoxyacetic acid from aqueous solutions. In this study, the effect of pH variables, pollutant concentration, stirrer speed, doscatalyst and contact time on the removal efficiency and determining the optimal conditions using the One factor at the time method was used. The catalyst was synthesized by co-precipitation and sol-gel method. The morphology of the synthesized N-TiO2@SiO2@Fe3O4 catalyst was determined using XRD, FT-IR, SEM, EDX, and BET devices. The results of this research showed that the highest percentage of 2-4 dichlorophenoxyacetic acid removal was obtained at pH= 6, initial concentration=5 mg/L, stirring speed of 300 rpm, duration of 90 minutes and dose catalysts, 0.3 g/L, 88.49% using nano catalyst. Modified titanium dioxide magnetization in the visible range with ultrasonic can be an effective method to remove organic and inorganic pollutants from aqueous solutions.