Activated Sludge Incineration Ash Derived Fenton-like Catalyst:Preparation and Degradation Performance on Methylene Blue
Fe@zeolite materials are widely applied in the production of·OH by catalyzing Fenton-like reactions for degradation of recalcitrant organic pollutants due to their comprehensive sources,simple preparation and low environmental impact.However,the high cost of Fe@zeolite synthesis and the lack of Fe2+regeneration strategy are serious issues that limit the application of Fe@zeolite as a Fenton-like catalyst in industrial-scale systems.In this study,the ash generated from activated sludge incineration treatment was utilized as raw material to selective recover Si,Al and Fe,preparing Fe2+-sodalite(FSD)material.Consequently,it was used as a Fenton-like catalyst to activate peroxyacetic acid(PAA)for the degradation of methylene blue(MB)in wastewater.Results indicated that FSD was capable of effectively catalyzing PAA to generate various active oxygen species such as·OH,1O2 and R-O in a wide pH range,thereby degrading MB through hydroxylation and sulfonation pathways.MB can be completely removed during 20 min under optimized conditions of 0.3 mmol/L PAA and 0.3 g/L FSD prepared with 0.5 mol/L Fe2+.In addition,the reductive S species in FSD can maintain its catalytical activity by enhancing Fe2+regeneration,and the FSD/PAA system has been proven to be effective in the degradation of various organic pollutants under practical and complex environmental conditions.
activated sludgesodaliteFenton-like degradationperoxyacetic acidmethylene blue
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