Potential use of artichoke (Cynara cardunculus L.) waste packed in filter bags for the removal of hexavalent chromium from water

Diaz-Rodriguez K.F.; Salazar-Pinto B.M.; Flores-Calla S.S.; Gonzales-Condori E.G. · Revista Mexicana de Ingeniera Quimica (2025) · DOI: 10.24275/rmiq/ia25426

Resumen

The objective of the study was to evaluate the removal of Cr (VI) from water using artichoke (Cynara cardunculus L.) waste powder packed in filter bags. For this purpose, the effects of the initial Cr (VI) concentration and adsorbent dosage factors were first evaluated using a 32 × 3 factorial design. Subsequently, the effect of pH, time, and temperature on the removal process was evaluated. The results show that a dosage of 5 g/L and pH=2 would achieve a higher adsorption efficiency. FTIR analysis showed the presence of functional groups such as hydroxyl, carbonyl, hydrocarbon chains, and aromatic groups characteristic of lignocellulosic compounds, which would be related to the adsorption process. The morphology of the artichoke evaluated by SEM indicates an irregular surface characteristic of adsorbents. The kinetic model that best describes the adsorption process corresponds to the pseudo-second order model. The Langmuir model that best fits the experimental data indicates that the adsorption process occurs in a monolayer with a maximum adsorption capacity of 7.89 mg/g. The mechanisms involved in adsorption correspond to electrostatic attraction and chemical adsorption. With these findings, it is concluded that artichoke waste packed in filter bags for the removal of Cr (VI) in water has proven to be an effective, simple, low cost and environmentally friendly process.

Instituciones: Universidad Tecnológica del Perú