Abstract
In this work, we investigated the mechanism of the oxidation of phenolic compounds (PCs) by graphitic sludge biochar (SDBCs) via a catalytic coupling regime in the presence of potassium persulfate (PDS). In-situ synchrotron attenuated total reflection Fourier transform infrared spectroscopy (in-situ ATR-FITR) combined with Raman spectroscopy directly monitored the formation of SDBC-PDS* complexes, which drove the electron-transfer pathway as evidenced by electrochemical tests and galvanic cell experiments. The coupling of pollutants into oligomers effectively reduced total organic carbon in water with a low PDS usage (PDS consumption to phenol degradation ratio of 2.2). Furthermore, our research showed that the biochar-based nonradical system effectively treats various PCs, with oxidation rates related to their half-wave potential and Hammett constant. Overall, this work explored sludge biochar engineering, PCs transformation and interfacial coupling mechanism, providing a novel approach for the efficient and cost-effective treatment of phenolic wastewater with low chemical input.
Published Version
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