The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

Abstract

The photooxidative decolorization of C.I. Basic Yellow 2 (BY2), was investigated using UV radiation in the presence of peroxydisulfate (S(2)O(8)(2-)) in a rectangular photoreactor at experimental condition. S(2)O(8)(2-) and UV-light showed negligible effect when they were used independently. Removal efficiency of BY2 was sensitive to the operational parameters such as initial concentrations of S(2)O(8)(2-), BY2, light intensity, flow rate and pH. The conversion ratios of BY2 at the volumetric flow rates of 330, 500 and 650 ml/min were 84%, 79%, 51% in 30 min, respectively. Our results showed that light intensity was a beneficial parameter for dye removal. The results showed that in the presence of S(2)O(8)(2-), the photooxidation quantum yield obtained was higher than direct photolysis quantum yield, suggesting that photodecay of BY2 was dominated by photooxidation. The electrical energy per order (E(EO)) values for decolorization of BY2 solution was calculated. Results show that applying a desired peroxydisulfate concentration can reduce the E(EO).

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

“…These observations implied that UV-365 nm/S 2 O 8 2-process was associated with a higher degradation efficiency of PVA owing to the following mechanism (Hori et al 2005(Hori et al , 2007Lau et al 2007;Salari et al 2009;Criquet and Leitner 2009;Lin et al 2011). and it can directly degrade PVA in aqueous solutions (Eq.…”

“…Therefore, UV/S 2 O 8 2-process has been confirmed to be effective in degrading organic contaminants (Hori et al 2005(Hori et al , 2007Lau et al 2007;Salari et al 2009;Criquet and Leitner 2009;Lin et al 2011). For example, Lin et al (2011) found that phenol (0.5 mM) can be completely degraded within 20 min using UV/S 2 O 8 2-process with a UV wavelength of 254 nm and an S 2 O 8 2-concentration of 84 mM.…”

Application of central composite design for the optimization of photo-destruction of a textile dye using UV/S2O8 2- process

“…The solution becomes more and more impermeable to UV radiation. Peroxydisulfate can then only be irradiated by a smaller portion of UV light to form lower free active radicals and the decolorization efficiency decreases 12,32 . Also Figures 4 and 5 showed that the color removal efficiency increased with increasing the reaction time.…”

“…The USEPA has listed it under the secondary drinking water standards with a maximum concentration of 250 mg/l (1.43 mmol/ l), based on aesthetic reasons 9,12 . The main objective of the optimization in this work is to determine the optimum values of variables for photooxidative decolorization using UV/S 2 O 8 2-process, from the CCD model obtained using the experimental data.…”

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

“…However, since the reactions of peroxydisulfate are generally slow at normal temperature. The thermal or photochemical activated decomposition of S 2 O 8 2-ion to SO 4 -radical has been proposed as a method of accelerating the process [19,20], as summarized in the following reactions (Eqs. 1-12):…”