Artículos de revistas
Nitrate uptake from water by means of tailored adsorbents
Fecha
2015-07Registro en:
Nunell, Gisel Vanesa; Fernandez, Maria Emilia; Bonelli, Pablo Ricardo; Cukierman, Ana Lea; Nitrate uptake from water by means of tailored adsorbents; Springer; Water, Air and Soil Pollution; 226; 8; 7-2015; 1-13
0049-6979
1573-2932
CONICET Digital
CONICET
Autor
Nunell, Gisel Vanesa
Fernandez, Maria Emilia
Bonelli, Pablo Ricardo
Cukierman, Ana Lea
Resumen
Two different adsorbents directed to nitrate removal from water were developed from Parkinsonia aculeata wood. An activated carbon was obtained by chemical activation with K2CO3 at 800 °C, whereas another adsorbent was prepared using a dilute solution of NH4Cl at 450 °C. Elemental compositions, surface functional groups, and textural parameters of both adsorbents were determined and compared with those of a commercial activated carbon used as a reference. Nitrate adsorption assays were carried out to examine the effects of solution pH, adsorbent dosage, contact time, and equilibrium adsorption isotherms. The adsorbent obtained with K2CO3 showed a well-developed pore structure (S BET∈=∈777 m2/g; V T∈=∈0.35 cm3/g) and neutral character, while the one prepared with NH4Cl exhibited a low porous development (S BET∈=∈58 m2/g; V T∈=∈0.03 cm3/g), acidic nature, and a noticeably high N content. The latter attained the highest nitrate removal efficiency, with a maximum adsorption capacity (X mL∈=∈0.40 mmol/g) higher than those estimated for the former (X mL∈=∈0.34 mmol/g) and the commercial sample (X mL∈=∈0.23 mmol/g), pointing to a predominant role of the chemical surface characteristics, mainly of N-containing groups and basic functionalities. Accordingly, the adsorbent obtained with NH4Cl represents a friendly novel material especially suited for nitrate removal.