Non-thermal plasma and Fe2+ activated persulfate ignited degradation of aqueous crystal violet: Degradation mechanism and artificial neural network modeling
| Autor: | Peng Nian, Shoujun Yuan, Songsheng Lu, Aiyong Zhang, Junyang Chen, Shen Zijun, Jingwei Feng, Du Yulai, Lu Peng |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Chemistry Analytical chemistry Filtration and Separation 02 engineering and technology 010501 environmental sciences Nonthermal plasma 021001 nanoscience & nanotechnology 01 natural sciences Activated persulfate Analytical Chemistry Chemical kinetics Absorbance chemistry.chemical_compound Degradation (geology) Crystal violet Gas chromatography–mass spectrometry 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Separation and Purification Technology. 191:75-85 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2017.09.016 |
| Popis: | Degradation of aqueous crystal violet (CV) by non-thermal plasma combined with Fe 2+ activated persulfate (PS) was investigated. Compared with single Fe 2+ activated PS system and single non-thermal plasma system, 54% and 42% enhancement for the degradation rates of CV were observed in the non-thermal plasma combined with Fe 2+ activated PS (NTP/Fe 2+ /PS) system, respectively. The effects of initial pH, discharge power, Fe 2+ concentration and PS addition on the degradation of CV were reported. The degradation of CV by NTP/Fe 2+ /PS followed pseudo-first-order reaction kinetics. The concentrations of generated H 2 O 2 , O 3 and OH in the NTP/Fe 2+ /PS system achieved 0.36 mg/L, 1.36 mg/L and 3.2 × 10 −6 mol/L at 1 min, respectively. In the NTP/Fe 2+ /PS system, the absorbance of the aqueous solution at 584 nm, the pH value and TOC decreased with increasing reaction time. Intermediate products and the degradation mechanism of CV were proposed according to the analysis of gas chromatography mass spectrometry. The acute toxicity of the solution showed a decreasing trend with the reaction time. The artificial neural network (ANN) models of NTP/Fe 2+ /PS system were established, and the ANN model could simulate the CV degradation process effectively. In the NTP/Fe 2+ /PS system, pH value had the greatest effect on the degradation of CV. |
| Databáze: | OpenAIRE |
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