Highly efficient porous carbons for the removal of W(VI) oxyanion from wastewaters

Pyrolysis chars derived from rice wastes were chemically activated and used in W(VI) oxyanion adsorption assays synthetic mining wastewaters. For comparison purposes, a commercial carbon (CAC) was also used. Different experimental conditions tested the assays: solid/liquid ratio (S/L), initial pH, contact time, W concentration. The porous P2C+KOH presented overall best performance both media, due to its high surface area (2610 m2 g−1), mesopore volume (1.14 cm3 neutral pHpzc (6.92). In wastewater, highest uptake capacity of (854 mg g−1) found with an S/L 0.1 g L−1, pH 2, concentration 150 for 24 h. This value almost 8 times higher than one obtained CAC (113 g−1). showed even (1561 assay same conditions, which 3 (561 These results suggest that seems be efficient alternative liquid effluents.