Effect of Additives on Ozone-Based Decomposition of Reactive Black 5 and Direct Red 28 Dyes

Superior School of Chemical Engineering, National Polytechnic Institute of Mexico (ESIQIE-IPN) Edif. 7, UPALM, Mexico D.F., C.P 07738.
Water Environment Research (Impact Factor: 0.87). 04/2013; 85(4):291-300. DOI: 10.2175/106143013X13596524515988
Source: PubMed

ABSTRACT In this research, ozonation of Reactive Black 5 (RB5) and Direct Red 28 (DR28) under the presence of Na2SO4 and Na2CO3 used as textile additives was investigated. The effect of these salts on discoloration, degradation dynamics, and the composition of the final compounds were studied. Different systems were evaluated; such as RB5-Na2SO4 (100 g/L), RB5-Na2CO3 (30 g/L), RB5-Na2SO4/Na2CO3 (100 g/ L/30 g/L), and DR28-Na2SO4 (10 g/L, 40 g/L, and 80 g/L) with dye concentrations of 50, 150, and 250 mg/L without pH adjustment. Discoloration of RB5 and DR28 with and without additives was determined by visible and UV (UV-Vis) spectroscopy. Decomposition of the dyes and the dynamics of intermediates and final byproducts were followed by high performance liquid chromatography. The presence of additives accelerated discoloration and decomposition for both dyes (more than 50%). The accumulation of oxalic and formic acids was observed. Possible mechanism schemes of ozonation for both dyes are proposed.

Download full-text


Available from: Poznyak Tatyana, Feb 17, 2015
22 Reads
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Effluents from dyeing processes of woollen textile finishing industries are highly polluted with recalcitrant compounds compared to effluents from rinsing and finishing processes. Oxidation of woollen textile dyeing effluent consisting of wastewater generated from spent dye baths and first and second rinses (remaining composite wastewater) were investigated. Ozone oxidation (CO3=18.5 mg/l; input rate) was applied on remaining composite wastewater, before and after the biological treatment, for various time intervals. Treatment efficiency was monitored by decolorization and by COD removal rates. Additionally, toxicity tests (bioluminescence test) were carried out to determine the effect of oxidation process. The results indicated that 40 min ozonation of biologically treated wastewater yielded almost colorless effluent with a decolorization efficiency of around 98–99% and with a corresponding ozone absorption rate of 58.0 mg/l. Biological treatment followed by 10 min ozone oxidation reduced the overall toxicity significantly (92%). However, ozonation was found to have only slight effect on COD removal.
    Dyes and Pigments 08/2003; 58(2-58):93-98. DOI:10.1016/S0143-7208(03)00047-0 · 3.97 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Complex chemical mixtures at hazardous waste sites can potentially consist of a marker chemical and several other chemicals, each of which can have different modulating actions on the dermatotoxicity of the marker chemical and/or other components in the mixture. A total of 16 mixtures, consisting of a marker chemical direct red 28 (DR28), a solvent (80% acetone or DMSO in water), a surfactant (0 or 10% sodium lauryl sulfate, SLS), a vasodilator (0 or 180 μg methyl nicotinate, MN) and a reducing agent (0 or 2% stannous chloride, SnCl2) were selected. Isolated perfused porcine skin flaps (IPPSFs), which have been proven to be an in vitro model for assessing absorption and toxicity, were utilized. These mixtures did not cause severe dermatotoxicity. However, light microscopic observations depicted minor alterations (intracellular and intercellular epidermal edema) with DMSO mixtures than with acetone mixtures. The presence of SLS caused an alteration in the stratum corneum. Enzyme histochemical staining for alkaline phosphatase (ALP) and nonspecific esterase (NSE) revealed no significant treatment effects, but increased staining for acid phosphatase (ACP) in the stratum basale was significant when associated with SLS or SLS+MN in DMSO mixtures. At 8 h post-dose, only DMSO mixtures containing SL+MN, SL+SnCl2, or SLS+MN+SnCl2 significantly increased transepidermal water loss. In conclusion, this study demonstrated that various mixtures, especially those containing SLS alter the epidermal barrier differently with complex interactions occurring simultaneously.
    Toxicology Letters 01/1998; 93(2-3-93):159-169. DOI:10.1016/S0378-4274(97)00083-0 · 3.26 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Dyes are natural and xenobiotic compounds that make the world more beautiful through coloured substances. However, the release of coloured wastewaters represents a serious environmental problem and a public health concern. Colour removal, especially from textile wastewaters, has been a big challenge over the last decades, and up to now there is no single and economically attractive treatment that can effectively decolourise dyes. In the passed years, notable achievements were made in the use of biotechnological applications to textile wastewaters not only for colour removal but also for the complete mineralization of dyes. Different microorganisms such as aerobic and anaerobic bacteria, fungi and actinomycetes have been found to catalyse dye decolourisation. Moreover, promising results were obtained in accelerating dye decolourisation by adding mediating compounds and/or changing process conditions to high temperatures. This paper provides a critical review on the current technologies available for decolourisation of textile wastewaters and it suggests effective and economically attractive alternatives.
    Bioresource Technology 10/2007; 98(12):2369-85. DOI:10.1016/j.biortech.2006.11.013 · 4.49 Impact Factor
Show more