Treatment of simulated textile sludge using the Fenton/Cl− system: The roles of chlorine radicals and superoxide anions on PAHs removal

Boosting Hydroxyl Radical Yield via Synergistic Activation of Electrogenerated HOCl/H2O2 in Electro-Fenton-like Degradation of Contaminants under Chloride Conditions

“…The Na 2 SO 4 –air sample represents • OH generation from the activation of H 2 O 2 , while NaCl–air and NaCl–N 2 show the • OH generation from activation of both H 2 O 2 /HOCl and only HOCl under N 2 saturated conditions, respectively. In addition, clopyralid (CLP) and benzoic acid (BA) were used as probe compounds to further analyze the generation of • OH and chlorine radicals, as CLP mainly reacts with • OH ( k = 0.73 × 10 9 M –1 s –1 ) while BA reacts with • OH ( k = 5.9 × 10 9 M –1 s –1 ), Cl • ( k = 1.8 × 10 10 M –1 s –1 ) and Cl 2 • – ( k = 2.0 × 10 6 M –1 s –1 ) . The degradation of CLP and BA alone, while the total inhibition of BA in the presence of 0.5 or 1.0 mM CLP as • OH scavenger (Figure b-c) show that the BNDC/GF6 mainly activated H 2 O 2 /HOCl to • OH.…”

“…• − (k = 2.0 × 10 6 M −1 s −1 ). 50 The degradation of CLP and BA alone, while the total inhibition of BA in the presence of 0.5 or 1.0 mM CLP as • OH scavenger (Figure 8b-c) show that the BNDC/GF6 mainly activated H 2 O 2 /HOCl to • OH. A previous study has similarly reported the photocatalytic activation of HOCl to mainly • OH and not to Cl • , however, it suggested the presence of ClO • generated as a side reaction between HOCl and • OH (HOCl + • OH → ClO • + H 2 O).…”

Remediation of PAHs contaminated industrial soils by hypochlorous acid: performance and mechanisms

“…22,23 However, adjusting the soil pH to 2.8-3.0 is a prerequisite for Fenton process, heavily inhibiting its wide application. 24,25 Based on sulfate radical oxidation mechanism, activated persulfate is able to degrade pollutants in soils. According to diverse activation conditions (such as temperature, pH, light, transition metal, base, catalyst, and electrical activation, etc.…”