Transformation of chlorobenzene and 4-chlorophenol in groundwater by electro-fenton and sono-electro-fenton reactions

• Online Access: http://hdl.handle.net/2047/D20290455

The study investigates the degradation of CB in groundwater by palladium (Pd)-catalyzed EF reaction in both batch and plug flow column reactors. In both reactors, Pd-catalyzed EF was initiated via in-situ electrochemical formation of hydrogen peroxide supported by Pd catalyst. Depending on the reactor, different types of catalysts were used: Pd on alumina powder, Pd on alumina pellets (Pd/Al₂O₃), and palladized polyacrylic acid (PAA) polyviniledene fluoride (PVDF) membrane (Pd-PVDF/PAA) where each form of support contained the same amount of Pd. In a mixed batch reactor under 120 mA and 10 ppm Fe(II), 2 g/L Pd/Al₂O₃ power and an initial pH of 3, CB degradation followed a first-order decay rate leading to 96% removal within 60 minutes. Under the same conditions, but using an innovative, rotating Pd-PVDF/PAA disk (27.8 mg/L immobilized Pd), 88% of CB was removed.