TY - JOUR
T1 - Arsenic(V) Removal with Polymer Inclusion Membranes from Sulfuric Acid Media Using DBBP as Carrier
AU - Ballinas, Ma De Lourdes
AU - Rodríguez De San Miguel, Eduardo
AU - Rodríguez, Ma Teresa De Jesús
AU - Silva, Orlando
AU - Muñoz, María
AU - De Gyves, Josefina
PY - 2004/2/1
Y1 - 2004/2/1
N2 - Polymer inclusion membranes (PIMs) based on cellulose triacetate (CTA) and dibutyl butyl phosphonate (DBBP) were tested for arsenic(V) separation from H2SO4 for its recovery from copper electrolytes. Solvent extraction experiments allowed the determination of the As(V)-DBBP and H 2SO4-DBBP complexes formed in the organic phase. Application of a transient model to membrane transport experiments in solutions containing only arsenic or H2SO4 indicated that it occurred under a kinetically controlled regime by formation of H 3AsO4[DBBP]2 and H2SO 4[DBBP] species, respectively. When arsenic and H2SO 4 are simultaneously present, the existence of a third species, H3AsO4[DBBP][H2SO4], explains well the fact that As(V) flux decreases and that H2SO4 flux increases. In both cases, a limiting 50% recovery value was obtained. However, active arsenic transport (>50%) is achieved if the H2SO 4 concentration gradient is assured (e.g., using a triple-cell configuration). In this way, high arsenic recovery factors (90% in 800 min) were obtained with initial concentrations of 5000 mg/L As(V) and 220 g/L H 2SO4. In all membrane systems tested, good As(V) selectivity over copper (up to 30 000 mg/L) was attained.
AB - Polymer inclusion membranes (PIMs) based on cellulose triacetate (CTA) and dibutyl butyl phosphonate (DBBP) were tested for arsenic(V) separation from H2SO4 for its recovery from copper electrolytes. Solvent extraction experiments allowed the determination of the As(V)-DBBP and H 2SO4-DBBP complexes formed in the organic phase. Application of a transient model to membrane transport experiments in solutions containing only arsenic or H2SO4 indicated that it occurred under a kinetically controlled regime by formation of H 3AsO4[DBBP]2 and H2SO 4[DBBP] species, respectively. When arsenic and H2SO 4 are simultaneously present, the existence of a third species, H3AsO4[DBBP][H2SO4], explains well the fact that As(V) flux decreases and that H2SO4 flux increases. In both cases, a limiting 50% recovery value was obtained. However, active arsenic transport (>50%) is achieved if the H2SO 4 concentration gradient is assured (e.g., using a triple-cell configuration). In this way, high arsenic recovery factors (90% in 800 min) were obtained with initial concentrations of 5000 mg/L As(V) and 220 g/L H 2SO4. In all membrane systems tested, good As(V) selectivity over copper (up to 30 000 mg/L) was attained.
U2 - 10.1021/es030422j
DO - 10.1021/es030422j
M3 - Article
VL - 38
SP - 886
EP - 891
IS - 3
ER -