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Arachis hypogaea derived activated carbon steered remediation of Benzimidazole based fungicide adsorbed soils

Ahmad, Khuram Shahzad
Chemistry in ecology 2019 v.35 no.6 pp. 576-591
Arachis hypogaea, Fourier transform infrared spectroscopy, Gibbs free energy, activated carbon, adsorption, agricultural soils, benzimidazole, carbendazim, fungicides, heat production, organic matter, pH, peanut hulls, remediation, soil sampling, statistical analysis, ultraviolet-visible spectroscopy
Sorption characteristics of the Benzimidazole fungicide Carbendazim were assessed in seven different soils using batch equilibrium method and analysed by UV-Vis spectrophotometer. The values of adsorption co-efficient Kd ranged from 14.3 to 39.8 µg/mL depending upon unique physiochemical properties of soils. Negative values for Gibbs free energy (ΔG) proposed an exothermic and low interaction between Carbendazim and soil samples leading to physiosorption. Statistical analysis showed a negative correlation of soil pH and Kd (R²= −0.80) and a positive correlation with organic matter (R² = 0.77). Activated carbon prepared from Arachis hypogaea (peanut shells) by acid activation for Carbendazim removal from soils was characterised by FTIR spectrometry, indicating the change in functional groups. The highest percentage removal observed was 70% in 5 ppm initial Carbendazim concentration while 65% in 7.5 ppm concentration. This method can be implied in agricultural soils as an efficient and cheap technique for removing the hazardous pesticides from the environment.