Comparison Degradation of Pentachlorophenol Using Microwave-Induced Nanoscale Fe⁰ and Activated Carbon

Lee, Hsien-Yi; Lee, Chien-Li; Jou, Chih-Ju G.

Comparison Degradation of Pentachlorophenol Using Microwave-Induced Nanoscale Fe⁰ and Activated Carbon

2010

Lee, Hsien-Yi | Lee, Chien-Li | Jou, Chih-Ju G.

Microwave (MW) is applied to enhance pentachlorophenol (PCP) removal using zerovalent iron (ZVI, Fe⁰) or granular activated carbon (GAC) as the dielectric media. Applying MW energy at 700 W for 20 s, the results show that Fe⁰ is capable of enhancing the CB removing 2.7 times (91% vs. 34 %) than GAC. Because Fe⁰ has higher dielectric loss (39.5 F/m vs. 8.3 F/m), it absorbs more MW energy to speed up the oxidation rate resulting in a faster temperature rise than GAC. Thus, in the presence of MW, Fe⁰ is superior to GAC for PCP removal. Additionally, excessive MW exposure will damage the surface structure of either Fe⁰ or GAC causing excessive electric charges to accumulate in the media that brings about the phenomenon of sparks.

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