科研之友
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摘要
In recent years the occurrence of chlorophenols in the aquatic environment has raised an increasing interest because of their high toxicity and low biodegradability. As a result, is an increasing interest in the development of efficient techniques for their removal or inactivation. Advanced oxidation processes have appeared as promising technologies for the treatment of wastewaters or effluents containing refractory organic pollutants. Among such techniques, semiconductor photo catalysis is nowadays recognised as an effective strategy for the removal a high number of organic or inorganic water pollutants. This paper deals with the photocatalytic degradation of a chlorinated phenol in aqueous solution using TiO2 as catalyst. For this study, 2,4,6-trichlorophenol (2,4,6-TCP) was selected as model molecule. The effects of some fundamental operating parameters in heterogeneous photocatalysis such as the initial pollutant concentration, catalyst load and the intensity of UV light were investigated in detail in order to fully characterize the photocatalytic process. Results showed that, under optimum degradation conditions an irradiation time of 90 min was sufficient to completely remove the 2,4,6-TCP. Under these experimental conditions, 94% of TOC reduction was achieved, confirming the higher mineralisation of reaction intermediates. Tthe results obtained in this work are very promising, given the refractory nature of this compound.
- 出版日期2016
