Affiliation:
1. Chemical Plants and Industrial Chemistry Group Dipartimento di Chimica Università degli Studi di Milano CNR-SCITEC via C. Golgi 19 I-20133 Milan Italy
2. INSTM Unit Milano-Università via C. Golgi 19 I-20133 Milan Italy
3. Dipartimento di Scienze Politiche ed Ambientali Università degli Studi di Milano via Celoria 26 I-20133 Milan Italy
4. Dipartimento di Ingegneria Chimica Civile ed Ambientale Università degli Studi di Genova and INSTM Unit Genova via all'Opera Pia 15 A I-16145 Genoa Italy
Abstract
AbstractDiclofenac sodium salt was photodegraded by means of advanced oxidation processes (AOPs), such as Fenton, photo‐Fenton and heterogeneous photocatalysis. For the latter different photocatalysts were compared, namely commercial titania P25 and titania metallized with gold (0.1 % Au/P25), silver (1 % Ag/P25) and palladium (0.1 % Pd/P25). Homogeneous treatments demonstrated effective in the degradation of the selected pollutant (>80 % conversion @2 h) when the irradiation occurred within the solution. Also, photo‐Fenton process assisted by visible light rather than UV was effective but slower and characterized by a toxicity of the residual solution due to unreacted H2O2. The photocatalyzed treatment performed at its best when P25 was used (70 % conversion @2 h), while modified photocatalysts reached the same conversion when H2O2 was added to the solution. Overall, in vitro toxicity tests using Daphnia Magna unveiled that the wastewater treated via M/TiO2 treatment and photo‐Fenton under UV in combination with H2O2 showed an acute toxicity comparable with the control group (almost 100 % viability @48 h). Conversely, the other processes failed to degrade completely either the pollutant or the hydrogen peroxide, leading to the mortality of 30–80 % of the individuals. An important outcome of the work is the direct comparison of different treatments to optimise the outcome, i. e. rapidity of degradation and non toxicity of the treated solution for living bodies.
Subject
Organic Chemistry,Physical and Theoretical Chemistry,Analytical Chemistry
Cited by
1 articles.
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