The Comparative Study on the Rapid Decolorization of Azo, Anthraquinone and Triphenylmethane Dyes by Anaerobic Sludge

Cui, Daizong; Zhang, Hao; Rubao, He; Zhao, Min

doi:10.3390/ijerph13111053

Cited by 46 publications

(21 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mixture was centrifuged at 5000 rpm for 3 min. A 500 µL portion of organic phase was transferred into a 1.0 mL vial, and 1 µL was injected into the GC-MS (Cui et al 2016;Wanyonyi et al 2017).…”

Section: Extraction Of Degradation Metabolitesmentioning

confidence: 99%

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

et al. 2019

View full text Add to dashboard Cite

This study aims to evaluate the degradation and mineralization of Malachite Green (MG) in an electro-Fenton process (EFP). We studied the influence of several important parameters including solution pH (2-11), current density (0-20 mA/cm 2), H 2 O 2 concentration (0-200 mg/L) and MG concentrations (200, 600, 1000, 1500, 2000, 3000 mg/L) at different reaction time (2.5-30 min). The intermediates produced during the degradation were determined by GC-MS. The optimum pH, current density and H 2 O 2 concentration were found to be approximately 3, 10 mA/cm 2 and 50 mg/L, respectively. It was concluded that acidic pH was required to increase the efficiency of the EFP. At optimum conditions and a reaction time of 15 min, MG was completely removed without any significant variation in the corresponding maximum wavelengths or new absorption bands. Due to formation of intermediates, almost all the organic compounds were completely mineralized (95.3%) to CO 2 and water at reaction time of 30 min. Results indicated the effect of hydroxyl radical (• OH) on MG degradation is greater than that of superoxide radical scavenger (O ⋅− 2). The results showed that the degradation process of MG followed pseudo-firstorder kinetic model and the treatment time required in EFP was 4.6 times lower than ECP. Furthermore, the results showed that EFP was an extremely efficient process for degradation and mineralization of a high concentration of MG (1000 mg/L) at a short reaction time (30 min).

show abstract

Section: Extraction Of Degradation Metabolitesmentioning

confidence: 99%

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

et al. 2019

View full text Add to dashboard Cite

show abstract

“…These toxic amines may be further oxidized to simpler non‐toxic forms only under aerobic conditions . In addition, the anaerobic biomass can convert MO to the products N , N ‐dimethylbenzene‐1,4‐diamine and 4‐aminobenzenesulfonic acid . The results of the present study have important implications from an industrial point of view, since margins to implement such a bioremediation technology and nanotechnology would be flexible to achieve the decolorization of textile and leather dyeing wastewater over short periods of time using E. faecalis strain Kilany MO.…”

Section: Discussionmentioning

confidence: 80%

Enhanced Methyl Orange Removal Using a Newly Isolated Bacterial Strain and Potassium‐Iodide‐Doped Hydroxyapatite Nanoparticles

Kilany

Ibrahim

Alshehri

et al. 2019

CLEAN Soil Air Water

View full text Add to dashboard Cite

Due to the toxicity and mutagenicity of methyl orange (MO), it is necessary to eliminate MO from wastewater. A bacterial strain is isolated and identified that possesses a high MO decolorization ability. Furthermore, the cultural requirements and the decolorization behavior of the bacterial isolate are investigated. Potassium‐iodide‐doped hydroxyapatite (KI‐doped HAp) nanoparticles are synthesized and characterized. The enhancement of the decolorization rate using KI‐doped HAp nanoparticles is experimentally confirmed. The microbial toxicity assessment is evaluated against Bacillus subtilis, and the bacterial isolate is identified as the Enterococcus faecalis strain Kilany MO under accession number KY780590. This strain shows maximum decolorization of MO (86.4%) at 400 mg L−1, pH 6, and 30 °C for 48 h under static conditions. In addition, being extremely tolerant of concentrations of MO of up to 1000 mg L−1 or more, E. faecalis exhibited decolorizing activity through biosorption rather than adsorption. Scanning electron microscopy and energy dispersive X‐ray spectra revealed that KI‐doped HAp nanoparticles are nanorods that are 50–100 nm in size with a Ca/P molar ratio of 1.833. KI‐doped HAp nanoparticles enhanced decolorization, yielding a maximum removal of 95% within 48 h. A microbial toxicity study revealed that the bacterial metabolites are less toxic than MO. Hence, the potential of E. faecalis to withstand high concentrations of MO, especially in the presence of nanoparticles, may start a new trend in wastewater bioremediation strategy.

show abstract

“…29 Reports are also available on other important dyes including triphenylmethane and anthraquinone which have been shown negative impacts. 12,30,31 Some dyes from the triphenylmethane group have been reported to be toxic, mutagenic, and carcinogenic. 30,31 More details about impacts of TWWs are indicated in Figure 1.…”

Section: Environmental and Health Impacts Of Textile Wastewatersmentioning

confidence: 99%

Recent advances in textile wastewater treatment using microbial consortia

Neifar¹,

Sghaier²,

Guembri³

et al. 2019

JTEFT

View full text Add to dashboard Cite

Overview of textile wastewaters and textile dyes Characteristics of textile wastewaters Textile dyeing industries are facing problems to meet the green practices standards for safe discharge of wastewater due to its complex nature. TWWs are a complex mixture of salts, acids, heavy metals, organ-chlorine-based pesticides, pigments and dyes. 5,10 TWWs generated from the different wet processes are characterized by high pH, temperature, BOD, COD, detergents, surfactants, suspended and dissolved solids, dispersants, leveling agents, toxic organics, chlorinated compounds, sulphide and formaldehyde, may be added to improve dye adsorption onto the fibers 9 and more details are mentioned in the Figure 1. Such effluents are also characterized by the presence of heavy metals, such as Cr, Zn, Cu and Al due to metal-based complexes dyes. 10,14 The most common textile operates are desizing, bleaching, mercerizing, dyeing and finishing. 15 Characteristics and the amount of TWWs depend to the process, dyeing is the most one which requires large volumes of water not only in the step of adding color to the fibers, in dye bath, but also during the rinsing step. Mercerizing and finishing are also significant generators of TWWs. In addition, equipment, machines and chemicals, 5 such as detergents and stabilizers, alter significantly the nature of TWWs. Another important factor which contributes to the ecotoxicity and the volume of TWWs is that dyeing and finishing processes, especially, require the imput of a wide range of dyestuffs. The Variety of dyes depends to the fiber used. 16 For example, cellulose fiber requires the application of direct, reactive, vat, azo or sulfide dyes. Acid dyes are used essentially for wool and silk. Azo and disperse dyes are applied to the polyester fiber. A large quantity of these dyes is released in the TWWs due to their degree of fixation to fibers.

show abstract

The Comparative Study on the Rapid Decolorization of Azo, Anthraquinone and Triphenylmethane Dyes by Anaerobic Sludge

Cited by 46 publications

References 37 publications

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

Electro-Fenton method for the removal of Malachite Green: effect of operational parameters

Enhanced Methyl Orange Removal Using a Newly Isolated Bacterial Strain and Potassium‐Iodide‐Doped Hydroxyapatite Nanoparticles

Recent advances in textile wastewater treatment using microbial consortia

Contact Info

Product

Resources

About