Naslov
The Effect Of The LAS Surfactant On Reactive Dye Degradation By Sono-Fenton Process

Autori
Grčić, Ivana ; Papić, Sanja ; Koprivanac, Natalija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
The 16th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil ; ABSTRACTS / Al-Ekabi, Hussain - London : Ontario : Redox Technologies, 2010, 161-161

Skup
The 16th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil

Mjesto i datum
San Diego (CA), Sjedinjene Američke Države, 15.11.2010. - 18.11.2010

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
surfactants; reactive dyes; sono-Fenton process; experimental design

Sažetak
Beside the organic dyes, an elevated concentration of the surfactants could be found in the dye bath effluents. Since there are controversial statements about the effect of the surfactants on the cavitational yield presented in the theory of the ultrasound, an extensive study regarding the effect of the LAS surfactant on the degradation of the reactive azo dye (C.I. Reactive Violet 2) by US/Fe2+/H2O2 process was performed. All experiments were performed in a batch sono-reactor at pH 3 and constant temperature, (29 ± 3)°C. Dye concentration was monitored by the means of UV-vis spectrophotometry while mineralization extents were established on the basis of the TOC measurements performed at several points within the reaction time. A methodology of the Design of the Experiment (DoE) was utilized for the evaluation of the selected process parameters and surfactant effects (i.e. critical factors, CFs) on the overall efficiency. A model describing the mineralization and decolourization as a function of the CFs has been developed. A kinetic study was performed on a single experiment operated at the optimal conditions ([Fe2+] = 1 mM, [H2O2] = 30 mM), determined using the desirability concept – Desirability Function Approach (DFA). A complete decolourization and approximately 37% of TOC removal were observed after the 60 minutes of the treatment. The presented study contributed to the better understanding of the processes occurring in the system ; dye molecule can be readily degraded following the mechanism of the advanced oxidation by hydroxyl radicals. On the other hand, it is considered that a long chain of the surfactant molecule can be oxidized by a pyrolysis within the bubble formed during the cavitation. The presence of the surfactant in the amounts higher than 25% (w/w) compared to the initial dye concentration resulted in a significant decrease of the decolourization achieved in the first 15 minutes of the process.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA