Mercury is one of the most toxic metals present in the environment. Adsorption has been proposed among the technologies for mercury abatement. Activated carbons are universal adsorbents which have been found to be a very effective alternative for mercury removal from water. The effectiveness with which a contaminant is adsorbed by the solid surface depends, among other factors, on the charge of the chemical species in which the contaminant is in solution and on the net charge of the adsorbent surface which depend on the pH of the adsorption system. In this work, activated carbon from carbonized eucalyptus wood was used as adsorbent. Two sulphurization treatments by impregnation with sulphuric acid and with carbon disulphide, have been carried out to improve the adsorption capacity for mercury entrapment. Batch adsorption tests at different temperatures and pH of the solution were carried out. The influence of the textural properties, surface chemistry and operation conditions on the adsorption capacity, is discussed.
The application of magnetic particle technology has shown great potential to solve problems in advanced technological areas/fields. Materials which exhibit superparamagnetic behavior at room temperature are particularly interesting because, among other applications, they are able to adsorb molecules of interest from liquid or gaseous streams and could be separated through the use of a magnetic field. In this work, magnetic activated carbons (MACs) were prepared by the deposition of a magnetic phase onto the porous structure of an activated carbon (AC) obtained from industrial waste (peach stones). Different methods to introduce the magnetic phase onto the porous matrix were used. The variation on the textural properties of MAC in contrast with the corresponding AC, was evaluated from adsorption of nitrogen at 77K studies. The magnetic phase was identified by XRD and the surface chemical composition by EDS. The behavior of MACs under a variable external magnetic field (hysteresis cycle) and under a fixed external magnetic field, was analized.
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