Potential applications of low-cost Brazilian corn starch as an adsorbent for removing the Acid Violet 19 contaminant from river water

Abstract

Abstract Indeed, the textile dye industry has a significant impact on the global economy, as it is an integral part of the textile and fashion industries. However, this advancement has become a great concern with industrial waste, a good part of these dyes have toxic characteristics to the environment and living beings. The objective of this work is the use of local corn starch as an adsorbent, for the removal of acid violet (AV19), a dye that is highly toxic and carcinogenic in real water samples. The material was characterized by scanning electron microscopy (SEM) and infrared (IR). The optimized parameters were concentration, time, and pH, in which the best results will be obtained at 60 min and pH 7. The experiment was compared to the Langmuir, Freundlich, and Temkin models. The concentration of dye was 4 mg L−1 had the highest removal which was 84.46 %. The prim rate constant is k′ = 0.8592 therefore the adsorption system studied obeys the pseudo-second-order kinetic model. In the next step, we will apply the top-performing starch to environmental samples containing the investigated dye. An analytical curve was constructed in the 2–14 ppm range at a maximum wavelength of 590 nm. The detection limit was 0.541 mg/L, and the percentage recovery was obtained in the range of 95–99.8 % for real water samples.