A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Boosting transformation of dissolved oxygen to superoxide radical: Function of P25
TiO2(P25) could significantly accelerate the degradation of carbon tetrachloride (CT) in the UV/K2S2O8 system by about 4 times, and 88.5% of the CT was dechlorinated. The presence of dissolved oxygen (DO) could delay the degradation process. The addition of P25 produced •O2− through the transformation of DO, so as to prevent the inhibitory effect. In this work, it was proved that P25 could not enhance the persulfate (PS) activation. The presence of P25 delayed the CT degradation in the absence of DO. Furthermore, the results of electron paramagnetic resonance (EPR) and quenching experiments demonstrated that the presence of P25 could produce •O2−, which could remove CT. Therefore, this work highlights the function of •O2− during the reaction and excludes the possibility that the presence of P25 could activate PS under the UV illumination. Then, the pathway of the CT degradation is discussed. Heterogeneous photocatalysis could provide a new method to deal with the problems caused by DO. The main reason of the improvement in P25‐PS‐UV‐EtOH system is transformation of dissolved oxygen into superoxide radical in presence of P25. The addition of P25 could not accelerate PS activation in P25‐PS‐UV‐EtOH system. Photo‐induced electron, superoxide radical, alcohol radical and •SO4− could all contribute to CT degradation, and the pathway is discussed.
Boosting transformation of dissolved oxygen to superoxide radical: Function of P25
TiO2(P25) could significantly accelerate the degradation of carbon tetrachloride (CT) in the UV/K2S2O8 system by about 4 times, and 88.5% of the CT was dechlorinated. The presence of dissolved oxygen (DO) could delay the degradation process. The addition of P25 produced •O2− through the transformation of DO, so as to prevent the inhibitory effect. In this work, it was proved that P25 could not enhance the persulfate (PS) activation. The presence of P25 delayed the CT degradation in the absence of DO. Furthermore, the results of electron paramagnetic resonance (EPR) and quenching experiments demonstrated that the presence of P25 could produce •O2−, which could remove CT. Therefore, this work highlights the function of •O2− during the reaction and excludes the possibility that the presence of P25 could activate PS under the UV illumination. Then, the pathway of the CT degradation is discussed. Heterogeneous photocatalysis could provide a new method to deal with the problems caused by DO. The main reason of the improvement in P25‐PS‐UV‐EtOH system is transformation of dissolved oxygen into superoxide radical in presence of P25. The addition of P25 could not accelerate PS activation in P25‐PS‐UV‐EtOH system. Photo‐induced electron, superoxide radical, alcohol radical and •SO4− could all contribute to CT degradation, and the pathway is discussed.
Boosting transformation of dissolved oxygen to superoxide radical: Function of P25
Ren, Qiang (author) / Liu, Juming (author) / Yang, Zhilin (author) / Yang, Qi (author)
2023-06-01
15 pages
Article (Journal)
Electronic Resource
English
Surface modification of polystyrene with atomic oxygen radical anions-dissolved solution
| British Library Online Contents | 2008
DISSOLVED OXYGEN REMOVAL SYSTEM AND DISSOLVED OXYGEN REMOVAL METHOD FOR WELL WATER
| European Patent Office | 2016
Monitoring Dissolved Oxygen and Total Dissolved Gas in Tailraces
| British Library Conference Proceedings | 1997
| British Library Conference Proceedings | 1998
Dissolved Oxygen Sensors: Addressing Longevity
| British Library Online Contents | 1992