AI Article Synopsis
- Phenols are common contaminants in water, and their breakdown can be influenced by pyrogenic carbon (PyC), but how PyC properties affect this process is not well understood.
- The study examined how different types of PyC remove various phenols in water, focusing on a short-term test that measured adsorption and degradation rates using a two-compartment kinetics model.
- Findings showed that adsorption of phenols was significantly faster than their degradation, with strong correlations between electron transfer rates in PyC and phenol degradation kinetics, underlining the importance of chemical properties in pollutant removal strategies.
Article Abstract
Phenols are the widely detected contaminants in the aquatic environment. Pyrogenic carbon (PyC) can mediate phenols degradation, but the specific properties of PyC or phenols influencing this reaction remain unknown. The present study investigated the kinetic process and mechanism of removal of various phenols by different PyC in aqueous phase system. To avoid the impact of the accumulated degradation byproducts on the overall reaction, we conducted a short-term experiment, quantified adsorption and degradation, and obtained reaction rate constants using a two-compartment first-order kinetics model. The adsorption rate constants (k) of phenols by PyC were 10-220 times higher than degradation rate constants (k), and they were positively correlated. Interestingly, no correlation was found between k and common PyC properties, including functional groups, electron transfer capacities, and surface properties. Phenols were primarily attacked by •OH in the adsorbed phase. But neither the instantly trapped •OH, nor the accumulated •OH could explain phenol degradation. Chemical redox titration revealed that the electron transfer parameters, such as the electron donating rate constant (k) of PyC, correlated well with k (r>0.87, P < 0.05) of phenols. Analysis of 13 phenols showed that E and E negatively correlated with their k, confirming the importance of the electronic properties of phenols to their degradation kinetics. This study highlights the importance of PyC electron transfer kinetics parameters for phenols degradation and manipulation of PyC electron transfer rate may accelerate organic pollutant removal, which contributes to a deeper understanding of the environmental behavior and application of PyC systems.
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| http://dx.doi.org/10.1016/j.watres.2024.122217 | DOI Listing |
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