Abstract
Catalytic electrodes were prepared via carbonization of MIL-53(Fe) on the surface of porous carbon felt electrodes (CF) for use in wastewater treatment by the heterogeneous electro-Fenton (EF) process. The best results were obtained when the carbon felt was pretreated with nitric acid, enhancing the affinity of the MIL-53(Fe) for the surface. Following a series of optimization experiments, carbonization conditions of 800 °C for 5 h were used to form Fe-nanoporous carbon (MOFs@CF). The as-prepared electrodes were used as both cathode and heterogeneous catalyst in the EF process for the mineralization of exemplar dye Acid Orange 7 (AO7). Total organic carbon (TOC) removal of 46.1% was obtained within 8 h of electrolysis at around neutral pH (6.5) and the electrode retained over 80% of its original efficiency over five treatment cycles.
Highlights
Advanced oxidation processes (AOPs) have been widely investigated for the removal of recalcitrant organic pollutants from wastewater [1,2]
We explored the performance and stability of a carbon felt electrode modified with carbonized MIL-53(Fe), (MOF@carbon felt electrodes (CF))
We explored the effect of varying thermal treatment temperature and MIL-53(Fe) loadings on the efficacy of the carbonized metal organic frameworks (MOFs)@CF electrodes for Nanomaterials 2019, 9, 641 removing Acid Orange 7 (AO7) from aqueous solution
Summary
Advanced oxidation processes (AOPs) have been widely investigated for the removal of recalcitrant organic pollutants from wastewater [1,2]. The electro-Fenton (EF) process is considered as a promising technology for the treatment of contaminated industrial wastewater, a vital issue in both the developing and developed world [3]. Acid Orange 7 (AO7) is a typical example of azo dyes, characterized by the presence of the azo group (-N=N-), which are mainly used in the textile industry [4]. When exposed into the environment via textile wastewater, they cause a threat to the aquatic medium because of their persistence and toxicity. The EF process treats contaminated wastewater using classical Fenton’s reaction chemistry in which in situ hydroxyl radicals (OH) are produced via the Fenton’s reaction (Equation (1)) [6,7,8]
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