Highly efficient biodegradation of reactive blue 19 under the activation of tea residue by a newly screened mixed bacterial flora DDMY2

Abstract

Tea residue promoted the decolorization of RB19 by activating flora DDMY2, revealing corresponding degradation pathways and functional genera in DDMY2.

Microbial decolorization of Reactive Black 5 dye by Bacillus albus DD1 isolated from textile water effluent: kinetic, thermodynamics & decolorization mechanism

“…(4) ), were found to be +27.95 kJ/mol and 2275 (1/Day), respectively ( Figure 3 a). The results are in good agreement with the recent studies on removal of RB5 ( Xie et al., 2019 ; Zamani et al., 2016 ).

Figure 3 (a) First order kinetic model of RB5 decolorization (b) Eyring–Polanyi model for decolorization of RB5 at different temperature.

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A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO2‐RuO2‐SnO2 electrodes

“…Product 2 underwent NH 2 group removal and generated an oxidation by‐product, which was previously detected in the electrolysis of RB19 (Vasconcelos et al, ). Product 3 was 2‐[(3‐aminophenyl) sulfonyl] ethyl sulfate and was also previously identified by others (Fanchiang & Tseng, ; Xie et al, ). Product 4 was benzenesulfinic acid, which has not been reported in the degradation of RB19.…”

“…Reactive Blue 19 (RB‐19) is a commercially available anthraquinone reactive dye. The major intermediates of RB19 degradation and the degradation route have been extensively studied in the past decades (Bilal et al, ; Fanchiang & Tseng, ; He et al, ; Siddique, Farooq, & Shaheen, ; Vasconcelos et al, ; Xie et al, ). In this study, the oxidation intermediate compounds of RB19 were identified through LC‐MS and GC‐MS analyses.…”

“…After 15.0 min, the newly formed peaks at 11.0 min and 9.6 min, with m / z values of 318.8 (product 1) and 206.6 (product 2), are shown in Supporting Information Figure b, and compounds with m / z values of 279.9 (product 3) and 140.6 (product 4) are identified in Supporting Information Figure c. Products 1 and 3 resulted from an attack on the –HN–C– aromatic rings of the dye by chlorine or hypochlorite oxidants to form –NH 2 , followed by hydroxylation of the aromatic rings and cleavage of the sulfoalkyl‐benzene group, which formed anthraquinone structures (Mascolo, Lopez, Bozzi, & Tiravanti, ). Product 1 was 1,4‐dihydroxy‐9,10‐dioxo‐9,10‐dihydroanthracene‐2‐sulfonate, which was identified in the degradation of RB19 by peroxydisulfate (McCallum et al, ) and a newly screened mixed bacterial flora DDMY2 (Xie et al, ). Product 2 underwent NH 2 group removal and generated an oxidation by‐product, which was previously detected in the electrolysis of RB19 (Vasconcelos et al, ).…”

High-efficient biodegradation of refractory dye by a new bacterial flora DDMY1 under different conditions

“…Annually, over 7 × 10 5 tons dyes are produced worldwide and azo dyes approximately account for up to 60% of the total dyestuff produced (Donadelli et al 2018). Azo dyes are characterized by one or more azo bonds (-N=N-), and they have been widely used in the textile, paper, food, leather, cosmetics and pharmaceutical industries (Xie et al 2019). In textile industries, more than 10-15% of the unfixed dyes are discharged into effluents either untreated or not completely treated, causing serious environmental and health hazards due to their color, xenobiotic feature and potential toxicity to primordial ecosystems (Khan et al 2014;Zheng et al 2019).…”