The Application of Fluorescence Spectroscopy for the Investigation of Dye Degradation by Chemical Oxidation
- PDF / 2,964,129 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 43 Downloads / 205 Views
ORIGINAL ARTICLE
The Application of Fluorescence Spectroscopy for the Investigation of Dye Degradation by Chemical Oxidation Guocheng Zhu 1
&
Haiquan Fang 1 & Yeyuan Xiao 2 & Andrew S. Hursthouse 3
Received: 14 May 2020 / Accepted: 27 July 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Chemical oxidation is a key technique used in dye wastewater treatment via the formation of hydroxyl radicals. To obtain optimal treatment effects, it is critical to understand the interaction of the molecular structure of the dye with the hydroxyl radical. We evaluated fluorescence excitation-emission matrix spectroscopy to study the decay of an azo-dye (Procion Red MX-5B) by a hydroxyl radical generated from catalytic Fe (III) on H2O2. Results showed that fluorescence signal reliably indicated the variations of the chemical groups and components during degradation, and the degradation could be divided into three stages: initial degradation (decolorisation), rapid intermediate degradation, and final degradation. Under control of uncorrected matrix correlation, the fluorescence fractions could be fitted successfully by parallel factor model (PARAFAC) model: two fluorescence components in initial degradation including mono substituted benzene and mono substituted naphthalene, three components as multi substituted benzene in rapid degradation, and no components could be resolved in the final degradation. The results from the study demonstrate the utility fluorescence characterization of dye degradation mechanisms and enhance the understanding of the degradation mechanisms. Keywords Dye . Advanced oxidation . Fluorescence spectroscopy
Introduction Dye wastewater from the dye and textile industry typically exhibits high COD and chroma as well as salinity, and is poorly biodegradable, and treatment is not easy. Treatment methods include physic-chemical [1, 2] and biological methods [3, 4]. Among them, the application of chemical oxidation [5, 6] has demonstrated the potential of a wide range of oxidants (for example, potassium permanganate, ozone, hydrogen peroxide, hypochlorite, fenton reagent) to rapidly oxidize and decompose organic matter. The molecular pathway for degradation has been studied using a range of * Guocheng Zhu [email protected]; [email protected] 1
Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
2
Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, Guangdong, China
3
School of Computing, Engineering & Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK
conventional techniques including Ultraviolet (UV) adsorption and gas chromatography/mass spectrometry (GC/MS) [7–9]. The former is mainly used for analysis of basic structure of dyes and determination of dye concentration. The latter is mainly used for further analysis of degradation pathway and intermediate degradation products. Although GC/MS is a sensitive analytical t
Data Loading...
