Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite

• Published in: Applied clay science Vol. 72; pp. 175 - 183
• Main Authors: Maqueda, C., dos Santos Afonso, M., Morillo, E., Torres Sánchez, R.M., Perez-Sayago, M., Undabeytia, T.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-02-2013; Elsevier
• Subjects: Adsorption; Diuron; Earth sciences; Earth, ocean, space; Exact sciences and technology; Mechanical treatment; Mineralogy; Montmorillonite; Sepiolite; Silicates; Thermal treatment; Diuron; Mechanical treatment; Montmorillonite; Adsorption; Sepiolite; Thermal treatment; scanning electron microscopy; adsorption; grinding; aqueous solutions; crystallinity; specific surface; smectite; montmorillonite; mineral shows; sepiolite; clay minerals; sheet silicates; silicates
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2012.10.017

The effects on montmorillonite (Mt) and on sepiolite (Sep) of mechanical (60 and 180s grinding time) and further thermal treatments (TT) at 500°C during 24h, for removing diuron from aqueous solutions were evaluated. The adsorbents and complexes formed were characterised. The specific surface area (SSA), SEM, XRD and zeta potential of the clay mineral samples were determined. The SSA values showed an increase of 50% for ground Mt and a slight decrease for ground Sep. TT reduced SSA by 50% for the Sep samples, but similar values remained for the Mt samples. Both minerals showed a decrease in crystallinity with increasing grinding time and TT. The zeta potential showed an increased of the negative surface charge for the Mt ground samples, but no changes were noticed for the Sep ground samples. The Mt-TT samples showed a slight decrease whilst the Sep samples showed an increase of the negative surface charge in comparison to those without thermal treatment. The adsorption of diuron on Mt was lower than on Sep, and it decreased slightly after 60 and/or 180s of grinding, despite the larger SSA values. This differences on the adsorption extent were probably due to the increased micropore surface. In contrast, thermal activation caused significantly increased adsorption, especially for the 180-s ground sample that was inversely correlated with the micropore surface, indicating that diuron was not adsorbed in micropores. Diuron adsorption on Sep was higher than on Mt due to its higher SSA. The adsorption capacity of Sep samples was increased by mechanical treatments (ground and sonicated). Moreover, thermal activation led to additional increases in adsorption probably due to changes in the Sep structure by the loss of OH structural groups leading to a more hydrophobic surface. Diuron adsorption on Mt-TT samples produced an increase in the negative surface charge compared to the original sample, whereas a decrease in the negative surface charge was observed for Sep.
► Surface area, SEM, XRD and zeta potential of mineral clay samples were determined. ► Diuron adsorption on milled Mt decreases while on milled heat-treated increases. ► Thermal and mechanical treat of sepiolite produces an increase of diuron adsorption. ► Both adsorbents and the surface complexes formed were characterized. ► The adsorption of sepiolite was four-fold higher than on montmorillonite.