The Effects of Inorganic Ions on Photodegradation of Humic Acids by Fe(III)/Oxalate Systems

摘要

The photodegradation of humic acids (HA) in aqueous solution was carried out in the presence of Fe(III) and oxalate, and the influence of inorganic ions, such as Ca~(2+), Mg~(2+), HCO_3~- and H_2PO_4~- on HA removal was investigated. 88.9% removal of HA in solution was reached after 75 min with Xe lamp irradiation (λ > 290 nm) when the initial concentrations of oxalate and Fe(III) were 0.5 mmol/L and 0.2 mmol/L, respectively. The photodegradation of HA by Fe(III)/oxalate system is inhibited by the presence of Ca~(2+), Mg~(2+), HCO_3~- and H_2PO_4~- in solutions.