The decolorization efficiency and influencing factors of low-temperature plasma on crystal violet wastewater
- VernacularTitle:低温等离子体技术对结晶紫废水的脱色效能及影响因素研究
- Author:
Xiaoyan LI
1
;
Jinren LIU
;
Jiajia LU
;
Xingmin SHI
;
Wang YUAN
Author Information
- Publication Type:Journal Article
- Keywords: low-temperature plasma(LTP); crystal violet(CV); decolorization
- From: Journal of Xi'an Jiaotong University(Medical Sciences) 2025;46(1):12-19
- CountryChina
- Language:Chinese
- Abstract: Objective To investigate the decolorization performance and key influencing factors of a novel low temperature plasma(LTP)on crystal violet(CV)simulated wastewater.Methods In this experiment,CV was used as the target pollutant and treated with LTP generated by argon atmospheric pressure plasma jet;the absorbance(A590)and chemical oxygen demand(COD)of CV solution were systematically evaluated before and after LTP treatment by adjusting the treatment volume,initial pH value,NaCl concentration,addition of Fe 2+and other parameters.The dynamic changes of active particles in the liquid were monitored.Results Compared with those of the control group,the A590 and COD values of LTP treatment groups were significantly reduced(P＜0.05).At the treatment time of 180 s,the decolorization rate and COD removal rate of CV solution reached 62.34％and 50.22％,respectively.Under the same treatment time(＞90 s),the A590 values in the 0.1 mol/L NaCl group,pH=9 or 11 group,and Fe2+group were lower than those in LTP-only treatment group,but the A590 values in the n-butanol group were higher(P＜0.05).The A590 values in 2 mL or 3 mL group were higher than those in 1 mL group(P＜0.05).Compared with CV solution treated with LTP,the H2O2 content in the activated water was higher while the NO3content was significantly lower than those in CV solutions(P＜0.05).Conclusion LTP has an efficient decolorization ability for CV solution.The decolorization of CV solution could be promoted by NaCl addition,Fe2+inclusion or high pH values,but was inhibited by the increase in treatment volume or the addition of n-butanol.The?OH and H2O2 generated by LTP played a key role in the decolorization process.
