Reactive Dyes Research Articles

Applicability, adsorbent chitosan@Fe2 (MoO4)3 nanocomposite for removal of textile reactive red198 dye from wastewater

In this study, the applicability of adsorbent Chitosan@Fe2(MoO4)3 nanocomposite was employed as a novel adsorbent for removing Reactive red198 dye from wastewater. Identical techniques, including BET, FT-IR, pH zero, and SEM, have to characterize this unknown material, and the effect of initial concentration (2–50 mgL−1), with temperature (298–308 K) on adsorption potential was analyzed in a batch system. The variables' impacts include Reactive red198 dye concentration, adsorbent, pH, and time (10 mgL−1, 0.15 g, 4.0, and 40.0 min). Based on the received data, the adsorption mechanism of Reactive red198 dye on the Chitosan@Fe2(MoO4)3 nanocomposite adsorbent agrees well with the Langmuir adsorption model isotherm (qm, exp ≈ qm, cal= 69.0 mgg−1), and pseudo-second-order kinetics (R2: 0.998). The results of the thermodynamic parameter showed a negative enthalpy (- 2.92 kJ mol−1), a negative Gibbs free energy (−15.25 kJ mol−1), and negative entropy (−39.28 kJ K−1 mol−1). This led to the conclusion that the adsorption process is energetically possible, and exothermic was also spontaneous. The values at the optimized process conditions indicated a commercially viable route for the optimal removal of dyes from industrial wastewater. The results indicated that Chitosan@Fe2(MoO4)3 nanocomposite showed great potential as an affordable and efficient adsorbent for treating wastewater.

Application of polyethylenimine hyperbranched polymers in low salt reactive dyeing of cellulose

This study aimed to graft a commercial amino-terminated hyperbranched polymer (AHP), specifically a low molecular weight branched polyethylenimine, onto cotton fibres through partial oxidation of cellulose with periodate. The primary objective was to assess the feasibility of achieving salt-free or low-salt dyeing of cotton with reactive dyes. The research investigated the washing, rubbing, and light fastness of modified cotton fabrics dyed in the absence or with a low-salt promoter, comparing the results with conventional dyeing methods. The findings indicated that grafting AHP through partial oxidation significantly reduced the required salt levels for dyeing with reactive dyes while maintaining colour intensity and comparable washing fastness properties.

A novel Zr-MOF and its In2S3/Zr-MOF heterojunction materials for decontamination of Cr(vi) and reactive blue 13 via fluorescence sensing detection and photochemical redox

A novel Zr-MOF and its heterojunction materials were designed, which perform highly efficient fluorescence quenching sensing of Cr(vi) ions, and photocatalytic decontamination towards Cr(vi) and reactive dyes under xenon lamp.

Improved application of immobilized Enterobacter cloacae into a bio-based polymer for Reactive Blue 19 removal, an eco-friendly advancement in potential decolorizing systems.

The widespread use of highly complex synthetic dyes like reactive dyes in the textile industry has some adverse environmental impacts and deserves close attention. Biological treatment of these effluents utilizing various species of bacteria with remarkable efficiency in dye removal is still considered promising. Our current study deals with immobilizing an isolated bacterial strain into calcium alginate (Ca/Alg) gel beads and using it to treat pernicious pollutants like synthetic dyes. A potential Reactive Blue 19 (RB19)-degrading Enterobacter cloacae strain A1 was isolated from the Kashan textile industry and was characterized by 16S rDNA gene sequencing. The decolorization ability of strain A1 was assessed by time-based studies using free bacterial cells/immobilized in Ca/Alg. Based on the results of the 16S rDNA gene sequencing, it appears that strain A1 belonged to E.cloacae, with a 99.74% similarity. The findings suggest that immobilized strain A1 accomplished maximum decolorization activity compared with the free cells. The immobilized strain could utterly decompose and decolorize 0.05 mg/mL of RB19 within 48 h, while the free bacterial strain decolorized RB19 within 5 days. Moreover, Ca/Alg gel beads can maintain their efficiency for over three decolorization cycles. Further infrared spectroscopy (FTIR) and gas chromatograph mass spectrometer (GC/MS) investigation declared complete RB19 decomposition on reaction products. Artemia salina was used to investigate the toxicity of dye and its degraded metabolites. The LC50 values signified the pure dye as very toxic with 0.01 mg/mL concentration, while after-treatment products showed no toxic effect on larvae. This immobilization technique increased the applicability of bacterial strain for dye removal. It was beneficial for the decolorization of RB19 from textile wastewater due to a remarkable reduction in time. Notably, strain A1-immobilized beads can maintain their activity for three consecutive decolorization cycles without a considerable decrease in efficiency. PRACTITIONER POINTS: The remarkable capacity of immobilized Enterobacter cloacae strain A1 for Reactive Blue 19 (RB19) removal Immobilized A1 strain showed two-fold higher removal than free one over 48 h A promising method for enhancing RB19 decolorization Decolorization was due to degradation based on UV-Vis, FTIR, and GC/MS analysis Non-toxic posttreatment products for Artemia.

Eco friendly dyeing of wool cotton blended yarn by reactive dye

Eco friendly dyeing of wool cotton blended yarn by reactive dye

Intermolecular interactions in mixed dye systems and the effects on dye wastewater treatment processes.

Dye wastewater discharge is a critical concern across textiles, paper, cosmetics, and other industries. This study explores the impact of dye-dye interactions on chemical coagulation and ultrafiltration process. Using basic and reactive dyes, representing cationic and anionic compounds, the intricate interplay between these dyes was examined through spectroscopic analysis. Remarkably, interactions between dyes of opposite charges exhibited significant effects on both techniques. Electrostatic attractions played a key role. Positive coagulant hydrolysates selectively attracted negative dyes, while negatively charged membranes effectively captured positive dyes. Combining dyes with opposite charges resulted in enhanced removal efficiency, addressing challenging dyes collectively. This discovery offers a novel approach to improving dye removal, utilizing opposite-charged dye mixtures can tackle stubborn dyes unmanageable by conventional methods.

Probing cell proliferation: Considerations for dye selection.

Broadly speaking, cell tracking dyes are fluorescent compounds that bind stably to components on or within the cells so the fate of the labeled cells can be followed. Their staining should be bright and homogeneous without affecting cell function. For purposes of monitoring cell proliferation, each time a cell divides the intensity of cell tracking dye should diminish equally between daughter cells. These dyes can be grouped into two different classes. Protein reactive dyes label cells by reacting covalently but non-selectively with intracellular proteins. Carboxyfluorescein diacetate succinimidyl ester (CFSE) is the prototypic general protein label. Membrane intercalating dyes label cells by partitioning non-selectively and non-covalently within the plasma membrane. The PKH membrane dyes are examples of lipophilic compounds whose chemistry allows for their retention within biological membranes without affecting cellular growth, viability, or proliferation when used properly. Here we provide considerations based for labeling cell lines and peripheral blood mononuclear cells using both classes of dyes. Examples from optimization experiments are presented along with critical aspects of the staining procedures to help mitigate common risks. Of note, we present data where a logarithmically growing cell line is labeled with both a protein dye and a membrane tracking dye to compare dye loss rates over 6days. We found that dual stained cells paralleled dye loss of the corresponding single stained cells. The decrease in fluorescence intensity by protein reactive dyes, however, was more rapid than that with the membrane reactive dyes, indicating the presence of additional division-independent dye loss.

Amendment of chitosan biopolymer with graphite for augmented confiscation of reactive blue-19 and reactive orange-16 textile dyes

Amendment of chitosan biopolymer with graphite for augmented confiscation of reactive blue-19 and reactive orange-16 textile dyes

Batik Waste Degradation Using Heterogeneous Fenton Method Using Catalysts To Reduce Environmental Pollution

The batik industry is one of the industries that develops from time to time. Among the problems that are still a concern today is industrial waste, especially the content of dyes. Reactive dyes found in batik wastewater are very harmful in the environment, and so far only a few industries process the batik waste before disposing of it into the environment. AOPs technology is a combination of several processes such as ozone (O3), hydrogen peroxide, UV light, titanium oxide, photocatalyst, electrolysis, electron beam, electrical discharge, and several others to produce hydroxyl radicals. One method of AOPs is the process of using fenton reagents. This study aims to identify the impact of variations that occur on the active components of batik color waste. The results showed that the use of zeolite catalysts tends to be more effective in absorbing polar components and less effective in absorbing organic matter. This statement is supported by a higher percentage of removal from natural zeolite than activated carbon which is 100%.

Preparation, Characterization, and Utilization of Banana Pseudo Stem as a Sustainable Adsorbent

Water pollution has been a thoughtful issue in recent decades, negatively affecting human health and ecology. The rapid development of industries, such as textile and leather, has contributed to water pollution due to an unprecedented amount of toxic industrial wastewater without a feasible wastewater treatment. Due to huge water consumption in all textile processes along with high concentration of lost dye as a result of low levels of dye-fiber fixation, dye removals from textile wastewater are an environmental concern. An attempt was taken to use the banana pseudo stem (BPS) to use as a sustainable adsorbent in removing dyes from aqueous solution. This experiment was carried out on a laboratory scale. The surface of banana pseudo stem (BPS) was modified by HCl and NaOH to observe the change in adsorption capacity. The acid modified BPS shows higher adsorption capacity than base modified BPS and unmodified BPS respectively. The FTIR spectrum was recorded to determine the main functional groups present on the surface of the banana pseudo stem. The effect of different physico-chemical parameters such as adsorbent dosage, contact time, initial concentration of dye, pH, and temperature on the removal of dyes from the aqueous solution has been studied. The maximum removal of a textile dye Congo red (CR) was found with a BPS mass of 1g/100 mL, at 30oC, at a concentration of 1×10-5 M, at pH 2.70 and 60 minutes of contact time. From the results, it is possible to conclude that banana pseudo stem could be a good alternative to the available adsorbent for the removal of reactive dyes from wastewater.

Effect of tannic/gallic acid-iron dyeing treatment on surface color and light fastness of bamboo veneer

Currently, the quest for bamboo materials with high color fastness, rich colors and environmental friendliness is rapidly rising due to its potential applications in construction, furniture and decoration. However, finding an easy-to-operate and environmentally friendly dye for bamboo is a necessary task because of the difficulty in treating the dyeing waste liquid of acid dyes and the complexity of the production process of reactive dyes.Five formulations involving metal polyphenol complexes were employed to straightforwardly produce eco-friendly dyed bamboo and the impact of various formulations on the light aging resistance of the dyed veneers was examined. The results indicated that the light resistance of bamboo veneer dyed with the solution containing only FeSO4·7H2O and tannic acid reached level 4, surpassing the undyed bamboo veneer by three levels. The mechanism of enhanced lightfastness of dyed bamboo veneer was elucidated by XPS analysis. The polyphenol iron complex serves a dual purpose: it absorbs ultraviolet rays and scavenges free radicals within the system. Additionally, it reduced the oxidation of phenolics in the substrate, transforming them into dark-colored quinone structures. This process enhanced the light-aging resistance of the finishing materials. Therefore, this work provides a simple and environmentally friendly method for changing the color of bamboo and provides a new idea for the selection of dyes for bamboo dyeing in actual production.

One-bath process of enzymatic pretreatment and trichromatic reactive dyeing of viscose fabric

One-bath process of enzymatic pretreatment and trichromatic reactive dyeing of viscose fabric

Synthesis of a series of Homo-Bifunctional Azo Reactive dyes and Evaluation of their dyeing properties on Silk fabric

This paper was conceived with the objective of synthesizing and evaluating some novel bifunctional Dichlorotriazine (DCT) azo reactive dyes. They were synthesized via tetrazotization of 1, 4- benzenediamine followed by the coupling with cyanurated 4-nitroanilino acids components (H-acid, J-acid, Laurent acid, Tobias acid and Gamma acid) respectively. The spectra properties (UV-vis spectra, FT-IR, 1H NMR and MS) of the synthesised dyes are reported. The novel bifunctional dichlorotriazine (DCT) azo reactive dyes were applied on silk fabric using the exhaustion techniques. The total exhaustion and fixation values were estimated. The basic fastness properties to washing, light and perspiration of the dyes on silk fabric were discussed in terms of their chemical structure. The dyes showed good build up, levelling and fastness properties on silk fabrics.

Techno-environmental and economic assessment of color removal strategies from textile wastewater

The textile industry is one of the most chemical-intensive processes, resulting in the unquestionable pollution of more than a quarter of the planet's water bodies. The high recalcitrant properties of some these pollutants resulted on the development of treatment technologies looking at the larger removal efficiencies, due to conventional systems are not able to completely remove them in their effluents. However, safeguarding the environment also implies taking into account indirect pollution from the use of chemicals and energy during treatment. On the other hand, the emerged technologies need to be economically attractive for investors and treatment managers. Therefore, the costs should be kept under control. For this reason, the present study focuses on a comparative Life Cycle Assessment and Life Cycle Costing of four scale-up scenarios aiming at mono and di-azo reactive dyes removal from textile wastewater. Two reactors (sequencing batch reactor and two-phase partitioning) were compared for different reaction environments (i.e., single anaerobic and sequential anaerobic-aerobic) and conditions (different pH, organic loading rates and use of polymer). In accordance with the results of each scenario, it was found that the three technical parameters leading to a change in the environmental profiles were the removal efficiency of the dyes, the type of dye eliminated, and the pollutant influent concentration. The limitation of increasing organic loading rates related to the biomass inhibition could be overcame through the use of a novel two-phased partitioning bioreactor. The use of a polymer at this type of system may help restore the technical performance (84.5 %), reducing the toxic effects of effluents and consequently decreasing the environmental impact. In terms of environmental impact, this is resulting into a reduction of the toxic effects of textile effluents in surface and marine waters compared to the homologous anaerobic-aerobic treatment in a sequencing batch reactor. However, the benefits achieved for the nature comes with an economic burden related to the consumption of the polymer. It is expected that the cost of investment of the treatment with the two-phase partitioning bioreactor rises 0.6–8.3 %, depending on market prices, compared to the other analyzed sequential anaerobic-aerobic technologies. On the other side, energy and chemical consumption did not prove to be limiting factors for economic feasibility.

Bioelectricity generation and anodic decolorization of reactive dyes in H-type microbial fuel cell using Pseudomonas gessardii

Anodic decolorization of reactive dyes like Coomassie Brilliant Blue (CB), a triphenylmethane dye, Reactive Red 120 (RR 120) and Reactive Black 5 (RB 5), azo dyes, was investigated in a 300-ml H-type dual chamber Microbial Fuel Cell (MFC) using monoculture of a novel strain Pseudomonas gessardii DD1. The MFC setups were evaluated for power generation, electrochemical activity, dye decolorizing efficiency, and COD removal efficiency. The study revealed a maximum power density 474.06 mW/m2 for RB 5 at 100 ppm concentration with 98.5% dye decolorization, while the maximum COD removal efficiency of 70% ± 2.9 was obtained. Cyclic voltammetry curves indicated the highest peak current of 1.8 mA for MFC operated using RB5. Maximum power density, in case of RR 120 and CB was 262.5 and 225.5 mW/m2, with 63 and 65% COD removal, respectively. Efficient power generation and dye removal is seldom reported in the literature, as the electrons generated by exoelectrogens are consumed for dye reduction and subsequent breakdown or decolorization. The findings indicate that the MFC technology can be an easy and economical option for bioelectricity generation using dye-contaminated wastewater with simultaneous detoxification of toxic pollutants and hence sustainable treatment of industrial wastewater.

Correction: NaCMC-decorated ZnO nanocomposite polymer membranes for the separation of reactive dyes from textile water

Correction for ‘NaCMC-decorated ZnO nanocomposite polymer membranes for the separation of reactive dyes from textile water’ by R. Robin et al., New J. Chem., 2023, 47, 20517–20526, https://doi.org/10.1039/D3NJ03783E.

Extraction of acid orange 7 from water by emulsion liquid membrane using Tri-dodecyl-amine as extractant

The main objective of this study was to investigate the feasibility of extracting Acid Orange 7 (AO7), a complex reactive dye, from aqueous solutions using a stabilized emulsion liquid membrane (ELM) technique. The ELM formulation comprised tri-dodecylamine (TDA) as the extracting agent, kerosene as the diluting medium, and SPAN 80 as the surfactant. We systematically examined various experimental variables that affect the extraction of AO7. These variables included the concentrations of the extractant and surfactant, internal phase concentrations, the ratio of the membrane phase to the internal phase, the choice of diluting medium and its grade, stirring speed, treatment ratio, and the initial concentration of AO7. Furthermore, we investigated the impact of sodium chloride concentration in the external phase. Our research findings indicate that the optimal conditions for AO7 extraction using the ELM method were as follows: a TDA concentration of 3% (w/w), a SPAN 80 concentration of 9% (w/w), an oil-to-aqueous phase ratio (O/A) of 1:1, kerosene as the diluting medium, H2SO4 as the internal phase, a stirring speed of 200 rpm, a treatment ratio of 1:10, and an initial AO7 concentration of 10 mg/L. Under these precise conditions, an exceptional extraction efficiency of 98.49% was achieved in just 15 min. Under these carefully controlled conditions, an exceptional extraction efficiency of 98.49% was achieved in just 15 min. Consequently, the emulsified liquid membrane extraction process demonstrates significant potential as an advanced separation technique for removing hazardous dyes, particularly in dilute solutions.

Mangifera indica stone-assisted layered double hydroxide biocomposites: efficient contenders for reactive dye adsorption from aqueous sources

Layered double hydroxide composites were synthesized from Mangifera indica stones for enhanced reactive green 5 dye removal from wastewater.

Critical Analysis of Surfactant-Dye Interaction: A Review

The interaction between surfactants and dyes is fundamental in achieving the desired coloration and properties in various applications, shaping the functionality and effectiveness of dye-related processes across multiple industries. Further research and advancements in this field will continue contributing to innovative solutions and improved sustainability. While mixed surfactants offer these advantages, the choice between using a single surfactant or a mixture depends on the specific application, the desired properties, cost considerations, and compatibility with other formulation components. It's important to carefully evaluate the application requirements and conduct appropriate testing to determine the most effective approach. In this work, the physical-chemical characteristics and solubilization of reactive dyes in single and mixed micellar media are elaborated. Compared to the single-micellar medium, the mixed-micellar medium showed improved reactive dye trapping, which was attributed to the presence of both cationic and nonionic surfactants, namely cetyltrimethylammonium bromide (CTAB) and triton X-100. In this interactional study, two reactive dyes were used: Reactive Black 5 (RB) and Reactive Yellow 145 (RY). It is noteworthy to examine the modeling and micellization of mixed surfactant systems in an aqueous medium including dodecyl trimethylammonium bromide (DTAB) and sodium dodecyl sulfate (SDS). The anionic-rich and cationic-rich interactions between methylene blue (MB) and methyl orange (MO) in aqueous solutions were clearly shown in the diagram.

Dyes and their Importance: A Review

The global market for pigments and dyes is forecast to reach 9.9 million tons and $26.53 billion by the year 2017, driven by the growth in key end-use industries. Before synthetic dyes and pigments were discovered, limited number of natural colorant has been obtained from plants, animals and minerals. The classification of colorants has become mandatory due to huge increase in kind and number of colorants. For this reason, colorants are classified based on their structure, source, color, solubility and application methods. In this chapter, dyes will be investigated in two different groups as accordance with chemical structures and application methods. The basic classification groups were determined as azo, anthraquinone, indigo, phthalocyanine, sulfur, nitro and nitroso dyes by considering their chemical structures. According to application method, they were grouped as reactive, disperse, acid, basic, direct, and vat dyes. However, the classification of pigments as organic and inorganic pigments is also regarded as an appropriate way.