Speaker
Description
This research aims to solve several problems in the environment imposed on us by modern society. The first is the removal of the systematic insecticide imidacloprid from the group of neonicotinoids, whose mass use in agriculture leads to elevated concentrations in water, which manifests negative effects on the environment1. Also, huge amounts of waste products in the form of fly ash and boiler ash are generated in thermal power plants for the purpose of obtaining electricity. Its disposal uses large areas of land and a huge amount of water and energy2. These problems represent a major health, ecological and economic problem.
In this paper, the possibilities of an adsorbent based on fly ash as a cheap adsorbent for removing the insecticide imidacloprid from water were examined. This study recognizes that fly ash (FA) is a promising adsorbent for the removal of various pollutants2. Fly ash from the Morava thermal power plant was simply chemically treated with CaO and water to give modified fly ash (MFA), which proved to be an effective adsorbent for the removal of imidacloprid from water. The content of lime (CaO and water) in the fly ash in relation to the adsorption capacity of imidacloprid and the adsorption conditions (pH value of the system, mass of adsorbent, temperature, and time) were optimized by applying D Optimal design of the response surface method (RSM). For this purpose, the commercial software "Desing Expert 9" was used. The results showed that the pseudo-first-order rate equation effectively describes the adsorption kinetics and that the adsorption equilibrium is established after 90 minutes. The Langmuir model showed a better fit to the adsorption isotherm than the Freundlich model. The maximum Langmuir adsorbent capacity for imidacloprid was 73.25 mg g-1 at 25 °C at a solution pH of 7.
Keywords: fly ash, adsorbent, imidacloprid, water, adsorption capacity, optimization.
References
1. Lu, J., Zhang, Z., Lin, X., Chen, Y., Li, B., and Zhang, Y. Removal of imidacloprid and acetamiprid in tea (Camellia sinensis) infusion by activated carbon and determination by HPLC, Food Control, 2022, 131. DOI: 10.1016/j.foodcont.2021.108395
2. Karanac, M., Ðolić, M., Veljović, Đ., Rajaković-Ognjanović, V., Veličković, Z., Pavićević, V.,Marinković, A. The removal of Zn2+, Pb2+, and As(V) ions by lime-activated fly ash and valorization of the exhausted adsorbent, Waste Manage. 78, 2018, 366–378. DOI: 10.1016/j.wasman.2018.05.052.
