Compared arsenic removal from aqueous solutions by synthetic mixed oxides and modified natural zeolites

GÓMEZ AVILA, JENNY; MENDOZA, SANDRA M.; VINUESA, ARIEL; GARAY, FERNANDO; HEREDIA, ANGÉLICA; SAUX, CLARA; CRIVELLO, MÓNICA

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY

SPRINGER

Lugar: Berlin; Año: 2019 vol. 25 p. 1425 - 1436

0929-5607

Mg-Al-Fe Layered Double Hydroxides and their Mixed Metalic Oxides of high specific area were synthesized by the coprecipitation method. A natural zeolite from a regional quarry with high Clinoptilolite content was conditioned and modified. Initially, an acid treatment was applied and subsequently Fe (III) was incorporated by the wet impregnation method. Then the prepared solid materials were characterized by XRD, BET, SEM, DRS UV and AES techniques to determine their physicochemical properties. Finally, the solid materials were evaluated as adsorbents for arsenic removal in water. The tracking of As and its species concentration at traces level was carried out by cathodic stripping Square-wave voltammetry (CS-SWV), which has proved to be a high selective and sensitive electrochemical method. High levels of effectiveness in terms of removal were achieved, particularly with the natural zeolites and mixed oxides of highest iron content