Investigation on Performance and Mechanism of the Falling Film-Type Plasma-Fenton Synergistic System in Treatment of KN-R Wastewater

doi:10.16553/j.cnki.issn1000-985x.2025.0037

Abstract

Abstract: With the development of industry， the treatment of printing and dyeing wastewater has become an important issue in environmental protection. As a typical dye in printing and dyeing wastewater， the degradation efficiency of reactive brilliant blue KN-R （RBB KN-R） directly affects the quality of wastewater treatment and environmental safety. Aiming at the problem of treating RBB KN-R printing and dyeing wastewater， this study designed a falling film dielectric barrier discharge （DBD） plasma reactor. The experimental results show that this device can effectively remove 84.30% of RBB KN-R within 25 min. Further combination of DBD plasma with the Fenton reaction significantly improves the degradation efficiency and mineralization rate of the dye. The study also analyzes the key reactive substances and degradation pathways during the degradation process， clarifies the synergistic mechanism between DBD plasma and the Fenton reaction. Moreover， this system causes less secondary pollution during the treatment process and is environmentally friendly. These findings provide theoretical support and practical guidance for the application of low-temperature plasma technology in the treatment of industrial wastewater.

Key words: falling film dielectric barrier discharge plasma; Fenton reaction; reactive brilliant blue KN-R; printing and dyeing wastewater treatment; degradation efficiency; synergistic effect

CLC Number:

SHI Weiye, LIU Sihan, ZHAO Shuchang, WANG Shuai, WANG Zhongbao, HUO Chunqing. Investigation on Performance and Mechanism of the Falling Film-Type Plasma-Fenton Synergistic System in Treatment of KN-R Wastewater[J]. Journal of Synthetic Crystals, 2025, 54(8): 1478-1490.

Figures/Tables 14

Fig.1 Chemical structure of reactive brilliant blue KN-R

Fig.2 Schematic diagram of the falling film dielectric barrier discharge （DBD） plasma reactor for low-temperature plasma treatment （1 represents the inner electrode， 2 denotes the ground electrode， 3 signifies the quartz tube， and 4 indicates the water storage tank）

Fig.3 Influence of initial solution concentration on the degradation efficiency of reactive brilliant blue KN-R （a）， and the fitting results of the first-order reaction kinetics （b）

Fig.4 Fading behavior of reactive brilliant blue KN-R solutions within 25 min at initial concentrations of 50， 100， and 150 mg/L

Fig.5 Impact of discharge power on the degradation efficiency of reactive brilliant blue KN-R （a）， and the first-order reaction kinetics fitting results （b）

Table 1 Calculations of input power， output power and energy output efficiency （input voltage 80 V）

Current/A	Input power/W	Output power/W	Output efficiency/%
1.70	136	61.93	45.54
1.80	144	73.50	51.04
1.90	152	79.66	52.40
2.00	160	83.34	52.09

Fig.6 Impact of initial pH on the degradation of reactive brilliant blue KN-R （a）， the first-order reaction kinetics fitting results （b）， and the variation in solution pH value during the treatment process （c）

Fig.7 Significant impact of liquid circulation velocity on the degradation efficiency of reactive brilliant blue KN-R

Fig.8 Effects of Fe2+ addition on the degradation efficiency of reactive brilliant blue KN-R （a）， a performance comparison with the single DBD system （b）， and the variation in H2O2 concentration in the solution during the treatment process （c） in the DBD/Fenton system

Fig.9 Variations of three critical indicators

Fig.10 Impact of various capture agent on the degradation efficacy of reactive brilliant blue KN-R

Fig.11 Analysis of the degradation process of reactive brilliant blue KN-R

Fig.12 Reactive brilliant blue primary mass spectra

Fig.13 UV-Vis spectra of reactive brilliant blue at different degradation time

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