✍ Scribed by Chongtai Wang; Yingjie Hua; Yexiang Tong
No coin nor oath required. For personal study only.
A novel Electro-Fenton-Like (EFL) system was developed using the Keggin-type iron-substituted heteropolytungstate anion PW 11 O 39 Fe(III)(H 2 O) 4-to substitute for Fe 3+ in the conventional Electro-Fenton (EF) system for treatment of water polluted with organic compounds. The EFL system overcomes the drawback of low pH in conventional EF approaches and can be directly applied to neutral water treatment without any pH adjustment. Experimental results for dimethylphthalate (DMP) revealed complete degradation in <80 min in pH 6.86 solution containing 0.1 mM DMP at a potential of -0.5 V and O 2 flow rate of 60 mL min -1 . Total organic carbon removal of ∼56% was achieved at 120 min. Comparison with conventional EF oxidation revealed better efficiency of the present system for DMP degradation, suggesting its potential in treatment of water and wastewater with a relaxed pH requirement. The cumulative H 2 O 2 concentration generated in situ at the electrode was monitored and the observed degradation rate constants k obs were determined for different initial DMP concentrations. The ligand exchange reaction of PW 11 O 39 Fe(III)(H 2 O) 4-with H 2 O 2 and the electron transfer resulting in hydroxyl radicals were examined using HPLC and electrochemical impedance spectroscopy. An electrocatalytic model involving inner-sphere electron transfer and a reaction mechanism for PW 11 O 39 Fe(III)(H 2 O) 4-electrocatalytic reduction of H 2 O 2 are proposed.
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