Abstract
p-Anisidine being a component of wastewater generated through dye and pharmaceutical industries is highly toxic and carcinogenic in nature. Therefore, its presence in wastewater requires prior treatment before its disposal from the point of safety of human and aquatic life. Fenton’s oxidation is a type of advanced oxidation processes which is efficient, ecofriendly and reliable, and this was not studied for the removal of p-anisidine from wastewater. In this study, the effect of influent pH, hydrogen peroxide (H2O2) concentration and ferrous ion (Fe2+) concentration on the removal of p-anisidine by Fenton’s reagent was carried out on a laboratory scale. All samples were examined for initial and final concentrations of p-anisidine using UV–Vis spectrophotometry, and also initial and final COD was analyzed. p-Anisidine shows maximum absorbance at 296 nm. At pH 2.5 and [H2O2]/[Fe2+] of 70:1 for the initial p-anisidine concentration of 0.5 mM and for 24 h reaction time, the maximum removal of p-anisidine was found to be 88.95% and maximum COD removal was 76.43%.
Highlights
BackgroundAniline derivatives are used in the manufacturing of dyes, pigments, paints, herbicides, plastics, pharmaceutical preparation and in the production of rubber accelerator (Datta et al 2003)
Keywords Fenton’s oxidation · p-Anisidine · Hydrogen peroxide · Ferrous ion Aniline derivatives are used in the manufacturing of dyes, pigments, paints, herbicides, plastics, pharmaceutical preparation and in the production of rubber accelerator (Datta et al 2003)
The pH plays an important role in controlling the production of HO· and F e2+ concentration in Fenton’s treatment
Summary
Aniline derivatives are used in the manufacturing of dyes, pigments, paints, herbicides, plastics, pharmaceutical preparation and in the production of rubber accelerator (Datta et al 2003). It is primarily used in the manufacture of precursors to polyurethane. Health and environmental concerns p-Anisidine is the most toxic of all the three isomers of anisidine, and it can damage blood severely when inhaled, orally ingested or contacted by skin. When p-anisidine is heated strongly, toxic fumes containing nitrogen oxides are released. High levels of p-anisidine can create interference with blood’s oxygen-carrying capacity which results in fatigue, headache, dizziness and blue-colored lips and skin. There can be trouble in breathing, subsequently collapsing of the exposed person and in extreme cases death (Fishersci.com 2018)
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