Abstract
In this study, the effects of temperature, pH, and biochar under cadmium stress on the adsorption characteristics of atrazine in soils in northeast China were studied by batch adsorption method. In the atrazine–Cd(II) coexistence system, the adsorption of atrazine by the soils reached equilibrium within 24 h, but there were some differences in sorption capacities of the three types of soil and the order of adsorption is albic soil > black soil > saline-alkaline soil. With the concentration of atrazine increased, the adsorption capacity of atrazine in the three types of soil gradually increased, the upward trend became more obvious with the ambient temperature of the solution decreased. The adsorption kinetics curves of atrazine in the three types of soil conform to the pseudo-second-order kinetic model and the adsorption isotherm follows the Langmuir model. When atrazine and Cd(II) coexist in soils, the decrease in atrazine adsorption in the soil may be due to the competitive interaction between the two chemicals. Cd(II) occupies part of the adsorption site of atrazine, thus saturating the active site in soils. Since atrazine is a weakly alkaline pesticide, the lower the pH of the soil, the higher the affinity of atrazine for the soil. After adding biochar to the soil, the functional groups in biochar can form π bond with atrazine, which promotes the fixation of atrazine in the soil. The results show that the prevention of atrazine and cadmium leaching can be achieved by appropriately adjusting the pH, temperature, clay content, and organic matter of the soils.
Highlights
The adsorption of pollutants on soil is an important environmental behavior
Wei et al (2018) found that the co-dissolution of heavy metals Cr and atrazine leads to the competitive adsorption of atrazine in the soils, in which the adsorption of atrazine by soil was greatly affected by the specific surface area and porosity of the soil, while the adsorption of Cr(III) by soil was greatly affected by pH and electrostatic adsorption
This study provided a basis for the dynamics of atrazine residue in soils, and pre-uses pH, organic matter, and other factors to promote the adsorption behavior of atrazine in soil containing Cd(II), providing a feasible method for preventing atrazine leaching
Summary
The adsorption of pollutants on soil is an important environmental behavior. The physical and chemical properties of the soil determine the migration and fate of pollutants in the environment, and the feasibility of contaminated soil remediation technologies (Ahmed et al, 2018; Smaranda et al, 2016). Among the heavy metals and organic pollutants, cadmium and atrazine are the most common pollutants in soils (Duan et al, 2016; Yang et al, 2015). When atrazine and cadmium coexist in the soil, it is difficult to fix them in the soil at the same time due to the different physical and chemical properties of metals and organic compounds (Salazar-Ledesma et al, 2018). It is found that the adsorption of lead and glyphosate is closely related to the soil type, and the adsorption of lead and glyphosate was the largest in red soil This observation is attributed to higher contents of iron and aluminum oxides and a lower pH value in the red soil than in the other soils. This observation is attributed to higher contents of iron and aluminum oxides and a lower pH value in the red soil than in the other soils. Wei et al (2018) found that the co-dissolution of heavy metals Cr and atrazine leads to the competitive adsorption of atrazine in the soils, in which the adsorption of atrazine by soil was greatly affected by the specific surface area and porosity of the soil, while the adsorption of Cr(III) by soil was greatly affected by pH and electrostatic adsorption
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