Adsorption of glyphosate herbicide by bentonite clay using a batch system
DOI:
https://doi.org/10.5902/2179460X91297Keywords:
Adsorption kinetics, Adsorption isotherms, Natural and calcined bentoniteAbstract
Although herbicides are designed for targeted action, they can lead to soil and water contamination, resulting in environmental degradation, health risks, and significant changes in ecosystems. In this context, this study evaluates the removal of glyphosate herbicide from aqueous solution through batch adsorption processes using raw (in natura) and calcined bentonite clay. The clay was washed, dried, and manually ground; part of it was calcined at 500 °C, and finally, both samples were sieved to MESH 100. The influence of the initial pH of the solution, the adsorbent mass-to-solution volume ratio, contact time, and adsorbate concentration were evaluated, as well as the adsorption kinetics and equilibrium through isotherm models. The raw and calcined clays presented a point of zero charge (pHPZC) of 6.77 and 4.12, respectively. The evaluation of the adsorption process at different pH values indicated that the most favorable pH was 4 for the raw material and 6 for the calcined clay. Batch experiments showed that the adsorbent mass did not have a significant influence on glyphosate removal using raw clay, considering the %rem response variable. The pseudo-second-order model best represented the adsorption kinetics of the herbicide, while glyphosate adsorption was best described by the Langmuir isotherm.
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