azo dyes
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2022 ◽  
Vol 45 ◽  
pp. 102499
Mohammad Shaiful Alam Amin ◽  
Frank Stüber ◽  
Jaume Giralt ◽  
Agustí Fortuny ◽  
Azael Fabregat ◽  

RAMONA Georgescu State ◽  
Jacobus Frederick van Staden ◽  
Raluca Ioana Stefan-van Staden

Abstract Synthetic dyes were widely used in food industry due to the advantages offered, such as good stability to oxygen, light, and pH, reproducibility, bright color, low sensitivity to storage conditions and technological processing, and of course, low cost. Unfortunately, some of them have potential harmful effects on human health (the presence of azo group in the molecular structure of azo dyes has carcinogenic and mutagenic effects in the human health), thus, their detection in various food and beverage products became essential. This review presents the latest development in sensors design used for the determination of two commonly used azo dyes – tartrazine and sunset yellow in real food and beverage samples, revealing that there is a variety of efficient sensors with low limits of detection, wide linear concentration ranges, and high selectivities and sensitivities.

Water ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 123
Yang Liu ◽  
Chenglong Li ◽  
Jia Bao ◽  
Xin Wang ◽  
Wenjing Yu ◽  

Increasing attention has been paid to the widespread contamination of azo dyes in water bodies globally. These chemicals can present high toxicity, possibly causing severe irritation of the respiratory tract and even carcinogenic effects. The present study focuses on the periodically reverse electrocoagulation (PREC) treatment of two typical azo dyes with different functional groups, involving methyl orange (MO) and alizarin yellow (AY), using Fe-Fe electrodes. Based upon the comparative analysis of three main parameters, including current intensity, pH, and electrolyte, the optimal color removal rates for MO and AY could be achieved at a rate of up to 98.7% and 98.6%, respectively, when the current intensity is set to 0.6 A, the pH is set at 6.0, and the electrolyte is selected as NaCl. An accurate predicted method of response surface methodology (RSM) was established to optimize the PREC process involving the three parameters above. The reaction time was the main influence for both azo dyes, while the condition of PREC treatment for AY simulated wastewater was time-saving and energy conserving. According to the further UV–Vis spectrophotometry analysis throughout the procedure of the PREC process, the removal efficiency for AY was better than that of MO, potentially because hydroxyl groups might donate electrons to iron flocs or electrolyze out hydroxyl free radicals. The present study revealed that the functional groups might pose a vital influence on the removal efficiencies of the PREC treatment for those two azo dyes.

Tehmina Kousar ◽  
Muhammad Aadil ◽  
Sonia Zulfiqar ◽  
Muhammad Farooq Warsi ◽  
Syeda Rabia Ejaz ◽  

2022 ◽  
Vol 160 ◽  
pp. 110353
Theepakorn Sansenya ◽  
Nataporn Masri ◽  
Tammanoon Chankhanittha ◽  
Teeradech Senasu ◽  
Jirayus Piriyanon ◽  

2022 ◽  
Vol 82 ◽  
E. R. Silva ◽  
E. L. Dall’Oglio ◽  
L. G. Vasconcelos ◽  
E. B. Morais

Abstract Shewanella xiamenensis G5-03 was observed to decolorize the azo dye Congo red in synthetic wastewater. The influence of some factors on the dye decolorization efficiency was evaluated. The optimal decolorization conditions were temperature 30-35 °C, pH 10.0, incubation time 10 h, and static condition. The kinetic of Congo red decolorization fitted to the Michaelis–Menten model (Vmax = 111.11 mg L-1 h-1 and Km = 448.3 mg L-1). The bacterium was also able to degrade benzidine, a product of azo bond breakage of the Congo red, which contributed to reduce the phytotoxicity. The ability of S. xiamenensis G5-03 for simultaneous decolorization and degradation of Congo red shows its potential application for the biological treatment of wastewaters containing azo dyes.

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