In-situ production of singlet oxygen by dioxygen activation on iron phosphide for advanced oxidation processes

Enhanced Photocatalytic Degradation of Emerging Contaminants Using Ti3C2Tx MXene-Supported CdS Quantum Dots

“…• O 2 − , h + , H 2 O 2 , and 1 O 2 , respectively. 60,67,68 As displayed in Figure 7a, the elimination efficiency of CBZ only marginally decreased by 6.2% with the addition of 10 mM AO, indicating the limited role of h + in CBZ degradation. Because the VB • OH radicals cannot be formed by the reaction of the holes produced in the VB with adsorbed water molecules or surface hydroxyls.…”

“…As is well-known, active species produced from solar light irradiation, such as superoxide radicals ( • O 2 – ), hydroxyl radical ( • OH), singlet oxygen ( 1 O 2 ), holes (h + ), etc., play a vital role in photocatalytic processes. To probe the contributions of various ROS to the photodegradation of CBZ, tert -butanol (TBA), p -benzoquinone (BQ), ammonium oxalate (AO), catalase (CAT), and furfuryl alcohol (FFA) were applied as the scavengers of • OH, • O 2 – , h + , H 2 O 2 , and 1 O 2 , respectively. ,, As displayed in Figure a, the elimination efficiency of CBZ only marginally decreased by 6.2% with the addition of 10 mM AO, indicating the limited role of h + in CBZ degradation. Because the VB value of CdS (1.765 V) is lower than E ( • OH/OH – ) (2.38 V vs NHE) and E ( • OH/H 2 O) (2.27 V vs NHE), • OH radicals cannot be formed by the reaction of the holes produced in the VB with adsorbed water molecules or surface hydroxyls. , However, the worst photodegradation of CBZ (only 28.7%) was obtained after the addition of 10 mM BQ, implying that • O 2 – was the most important reactive species.…”

Spontaneous Formation of Low Valence Copper on Red Phosphorus to Effectively Activate Molecular Oxygen for Advanced Oxidation Process

“…However, no characteristic peak of 1 O 2 is detected (Figure S8e). Moreover, coumarin is used to capture ·OH to produce 7-hydroxycoumarin with photoluminescence signal. , Figure h and Figure S9 show that the signal intensity of 7-hydroxycoumarin increases sharply, also indicating that the P-Cu samples produce a large number of ·OH. The cumulative ·OH production in the O 2 atmosphere is also conducted.…”

Zero valent iron-electro-Fenton-peroxymonosulfate (ZVI-E-Fenton-PMS) process for industrial wastewater treatment

“…44 Its generation mainly includes: (1) PMS self-decomposition to produce 1 O 2 (eqn (14)), as shown in Fig. 4(d), where PMS alone formed a TEMP- 1 O 2 adduct with TEMP without the addition of any catalyst; (2) the H 2 O 2 produced in the process reacts with ˙OH to produce 1 O 2 (eqn (24)–(26)); 45,46 (3) the generated ˙OH likes to adsorb on the ZVI surface, and then ZVI triggers a surface-bound ˙OH-mediated reaction to produce 1 O 2 , 47 this reveals why the characteristic peak signal of the TEMP- 1 O 2 adduct of the ZVI-PMS process is higher than that of the other processes in Fig. 4(d); (4) ˙OH promotes the formation of 1 O 2 in the presence of an electric field (eqn (27)).…”