1. Pulsed gas-liquid discharge plasma catalytic degradation of BPA over graphene/CdS: process parameters optimization and O3 activation mechanism analysis
- Author
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Nan Jiang, Xuechuan Li, Ju Li, Jie Li, Bing Liao, Bangfa Peng, and Guo Liu
- Subjects
Condensed Matter Physics - Abstract
In the present work, a multi-pin-to-plate pulsed gas-liquid hybrid discharge reactor coupled with graphene/CdS catalysts was evaluated to eliminate Bisphenol A (BPA) in wastewater. The optimization of series of process parameters including pulse peak voltage, air flow rate, electrode gap, catalyst dosage, initial BPA concentration, initial solution pH, and solution conductivity was performed in terms of BPA degradation performance. The experimental results demonstrated that BPA removal rate increased with increasing the discharge voltage and decreasing the initial BPA concentration or solution conductivity. Nevertheless, too high or too low air flow rate, electrode gap, catalyst dosage, and initial solution pH would lead to the decrease in BPA degradation. Moreover, optical emission spectroscopy (OES) was gained to understand the information of short-life reactive species formed from the pulsed gas-liquid hybrid discharge plasma (PHDP) system. The results indicated the existence of several highly oxidative free radicals like ·O and ·OH. Finally, the activation pathway of O3 on the catalyst surface was analyzed by density functional theory (DFT).
- Published
- 2023