Assessment of the validity of the quenching method for evaluating the role of reactive species in pollutant abatement during the persulfate-based process

Regulating Interlayer Confinement FeOCl for Accelerating Polymerization of Pollutants to Reduce Carbon Emission in Water Purification

“…To understand the active oxygen species in the catalytic process of FeOCl and DMF-FeOCl, methanol (MeOH) was used as the quencher of ·OH ( k OH = 9.7 × 10 8 M –1 ·s –1 ) and SO 4 · – ( k SO4·‑ = 1.1 × 10 7 M –1 ·s –1 ), tertiary butyl alcohol (TBA) as the quencher of ·OH ( k OH = 2.8 × 10 9 M –1 ·s –1 ), and NaN 3 as the quencher of 1 O 2 ( k 1O2 = 1.54 × 10 8 M –1 ·s –1 ) were discussed in combination with EPR. In the FeOCl/PS system, it can be found that when TBA was added as the quencher, the inhibition of pollutants removal rate was not obvious (Figure S19a), and the kinetic removal rate was found to slow down (Figure S19b, Figure a, Table S14).…”

Revealing Intrinsic Relations Between Cu Scales and Radical/Nonradical Oxidations to Regulate Nucleophilic/Electrophilic Catalysis

“…It is noted that the conventional radical scavengers may not solely stand as a valid proof, [ 40 ] especially when the electron shuttle regime over carbon is involved. [ 1,3 ] Probe tests with different chemicals susceptible to respective ROS were introduced as target chemicals.…”

Degradation of methylene blue by an E-Fenton process coupled with peroxymonosulfate via free radical and non-radical oxidation pathways

“…Many studies have demonstrated that single linear oxygen ( 1 O 2 ) can be produced in the PMS activation process, 47,48 while the autolytic action of PMS can also produce 1 O 2 slowly. To determine whether 1 O 2 was produced, FFA was used as the 1 O 2 quencher, and its reaction rate constant with 1 O 2 was 1.2 × 10 8 M −1 s −1 , which was much higher than other quenchers, 23 but its reaction rate constants with ˙OH and SO 4 ˙ − were also as high as 1.5 × 10 10 M −1 s −1 and 1.3 × 10 10 M −1 s −1 , respectively, 44,49 so the reaction rate constants were adjusted by adding different amounts of quenchers to ensure that different quenchers react at the same rate with ˙OH to determine if 1 O 2 is present. Thus 6 mmol L −1 FFA, 100 mmol L −1 MeOH and TBA were added to ensure that the reaction rates with ˙OH and SO 4 ˙ − were of the same order of magnitude, while there were also three orders of magnitude differences in the reaction rates for 1 O 2 .…”

“…À were also as high as 1.5 Â 10 10 M À1 s À1 and 1.3 Â 10 10 M À1 s À1 , respectively, 44,49 so the reaction rate constants were adjusted Paper NJC by adding different amounts of quenchers to ensure that different quenchers react at the same rate with OH to determine if 1 O 2 is present. Thus 6 mmol L À1 FFA, 100 mmol L À1 MeOH and TBA were added to ensure that the reaction rates with OH and SO 4…”