RT journal article
T1 Honeycomb filters as an alternative to powders in the use of clays to remove cadmium from water
A1 Ahrouch, Mohammadi
A1 Gatica Casas, José Manuel
A1 Draoui, Khalid
A1 Bellido Milla, Dolores
A1 Vidal Muñoz, Hilario
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
A2 Química Analítica
K1 Adsorption
K1 Clay
K1 Cadmium
K1 Honeycomb monoliths
K1 Water depollution
AB Two natural Moroccan clays, an illite-smectite (O) and a stevensite (ST), were used to manufacture honeycomb monoliths for the removal of cadmium from aqueous solution. This goal was based on their easy extrudibility without additives and good performance for organic dyes and lead removal in previous studies. First, the influence of adsorbent dosage, time, pH and initial Cd(II) concentration was studied through batch experiments with the clay powders. Then, flow recirculation tests with the clays conformed as structured filters were performed. These confirmed the kinetics and adsorptive model, pseudo-second order and Langmuir, respectively, no matter the linear or non-linear character of the regression followed to fit the experimental data. With both experimental and sample designs, ST exhibited better performance than O. This could not be attributed to an exchange with Mg(II) overlapping the adsorption, despite its greater content in this element. Clay honeycombs behaved also better than packed columns charged with the same amount of powdered clay in similar experiments. Their maximum adsorption capacity (4 mg/g) ensures complete depuration of a solution containing 150 ppm of Cd(II) after recirculation through a 10 cm long and 3 cm-diameter monolith with the help of a centrifugal pump for less than 10 h.
PB Elsevier
SN 1879-1298
YR 2020
FD 2020
LK http://hdl.handle.net/10498/36106
UL http://hdl.handle.net/10498/36106
LA eng
NO Ministry of Economy and Competitiveness of Spain/FDER Program of EU (MAT2017-87579-R and MAT2017-84228-R Projects), the University Institute of Research on Electron Microscopy and Materials (IMEYMAT) of Cadiz University (HOMOGREEN and NUPRECAT Projects) and the Junta de Andalucía (FQM-110 group).
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026