Influence of ionic strength, anions, cations, and natural organic matter on the adsorption of pharmaceuticals to silica

摘要: The adsorption of four wide-use pharmaceuticals (carbamazepine, diclofenac, ibuprofen, and ketoprofen) onto a porous silica was investigated under varied ionic strengths, different anions, divalent cations (Ca(2+) Mg(2+)), trivalent (Al(3+) Fe(3+)), natural organic matter (NOM). experiments demonstrated that at given pH the most affected by strength, cations, properties pharmaceuticals. increase strength resulted in an ketoprofen, but decrease carbamazepine. Trivalent metal made intense increases three acidic pharmaceuticals, which could be due to formation inner-sphere complex on surface and/or complexation with both aqueous species. It found carbamazepine not whereas diclofenac solely impacted presence Al(3+). Moreover, low concentration slightly enhance ibuprofen NOM caused reduction tested except for diclofenac. These results suggest are notable factors affecting thus ultimate fate environment.