Preparation of CNT-Fe/Zn catalyst and its catalytic ozonation for DBP degradation
Dibutyl phthalate(DBP),an endocrine disruptor,has been frequently detected in surface water,soil,and groundwater in recent years,posing potential risks to both ecological environments and human health.Catalytic ozonation has been proven effective for DBP removal,albeit its efficacy is significantly influenced by pH level.In this study,carbon nanotube-based catalysts were prepared through an impregnation-calcination method,including zinc-loaded(CNT-Zn),iron-loaded(CNT-Fe),and zinc-iron co-doped(CNT-Fe/Zn)catalysts,whose performances in catalytic ozonation of DBP in water were examined at varying pH levels.The results demonstrate that CNT-Fe/Zn exhibited optimal catalytic performance with a removal rate increase by 22％～52％compared to sole ozone degradation of DBP over a wide pH range.Even after five consecutive uses,CNT-Fe/Zn maintained high catalytic activity and low metal leaching rates.Under conditions of an initial DBP concentration of 4mg/L,initial pH of 4,ozone dosage of 20mg/L,and catalyst addition of 50mg/L,the DBP removal rate was up to 72.4％within 30minutes.The catalyst was characterized to reveal oxygen-containing groups on the surface of CNT-Fe/Zn as the primary active sites.In general,the CNT-Fe/Zn can facilitate the generation of hydroxyl radicals and further enhance DBP removal by forming hydrogen peroxide under acidic conditions,and its robust stability and reusability have been also confirmed by catalysis cycling experiments.
catalytic ozonation of dibutyl phthalatefranklinitecarbon nanotubespH
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维普
