Metanil Yellow Dye Research Articles

Residual peel of pitaya fruit (Hylocereus undatus) as a precursor to obtaining an efficient carbon-based adsorbent for the removal of metanil yellow dye from water

The pitaya peel (Hylocereus undatus) was carbonized in the presence of ZnCl2 to obtain a carbon-based adsorbent to remove the Metanil Yellow dye (MY) from colored waters. The characterization techniques confirmed that the material had morphological changes with the appearance of new irregularities and cavities. Besides, the alternative adsorbent was formed mainly by carbon and functional groups characteristic of lignin and cellulose. Isothermal and kinetic studies were carried out at the natural pH of the solution at a dosage of 0.4 g L−1. The Langmuir model demonstrated the best adjustment of the equilibrium isotherms of the system, reaching the maximum adsorption capacity of 144.07 mg g−1 at 298 K. The thermodynamic behavior indicated that it is a spontaneous and favorable process of an exothermic nature (ΔH0=−34.02 kJ mol−1), consistent with a mechanism involving electrostatic interactions. The MY concentration influenced the kinetic. The homogeneous surface diffusion model (HSDM) showed good statistical adjustment to the kinetic values, showing a slight increase in the diffusivity coefficient from 2.4 × 10−9 to 4.5 × 10−9 cm2 s−1 with the increased MY concentration. The material application in a mixture containing several dyes and salts in the circumstances close to the real ones showed removal of 82.5%. The adsorbent could be regenerated and used 12 times. Therefore, it can be concluded that the pitaya fruit residual biomass can be used as a precursor for preparing carbon-based adsorbents. The adsorbent, in turn, is a promising alternative in the treatment of MY dye and mixtures of organic molecules.

Isolation of chitosan from shrimp shell (Metapenaeus monoceros) as adsorbent for removal of metanil yellow dyes

Isolation of chitosan from shrimp shell (Metapenaeus monoceros) as adsorbent for removal of metanil yellow dyes

Biostimulation of Microbial Communities from Malaysian Agricultural Soil for Detoxification of Metanil Yellow Dye; a Response Surface Methodological Approach

In the present study, a mixed culture from a local agricultural soil sample was isolated for Metanil Yellow (MY) dye decolorization. The metagenomic analysis confirmed that 42.6% has been dominated by genus Bacillus, while Acinetobacter (14.0%) is present in the microbial communities of the mixed culture. For fungi diversity analysis, around 97.0% was “unclassified” fungi and 3% was Candida. The preliminary investigation in minimal salt media (MSM) showed that 100% decolorization was achieved after 24 h of incubation. Response surface methodology (RSM) was successfully applied using Box-Behnken design (BBD) to study the effect of four independent parameters—MY dye concentration, glucose concentration, ammonium sulfate concentration, and pH—on MY dye decolorization by the mixed bacterial culture. The optimal conditions predicted by the desirability function were 73 mg/L of MY, 1.934% glucose, 0.433 g/L of ammonium sulfate, and a pH of 7.097, with 97.551% decolorization The correlation coefficients (R2 and R2 adj) of 0.913 and 0.825 indicate that the established model is suitable to predict the effectiveness of dye decolorization under the investigated condition. The MY decolorization of the mixed bacterial culture was not affected by the addition of heavy metals in the growth media. Among the 10 heavy metals tested, only copper gave 56.19% MY decolorization, whereas the others gave almost 100% decolorization. The decolorization potential of the mixed bacterial culture indicates that it could be effective for future bioremediation of soil-contaminated sites and treatment solutions of water bodies polluted with the MY dye.

Modification of rice husk silica with bovine serum albumin (BSA) for improvement in adsorption of metanil yellow dye

In the present research, bovine serum albumin-modified silica from rice husk has been prepared and examined as adsorbent for removal of the metanil yellow dye. The silica was obtained by purification of silica from the rice husk. Rice husk was heated up at 700 °C for 4 h, the obtained rice husk ash was mixed with NaOH 5% and acidified with HNO3 10% to obtain silica. The modification was carried out by reacting silica with bovine serum albumin, and the amine-functionalized rice husk silica was obtained. The rice husk silica and amine-functionalized rice husk silica were characterized by Fourier-transform infrared, X-ray fluorescence, scanning electron microscopy, and Brunauer–Emmett–Teller. The adsorption study was conducted using batch method and investigated some parameters such as pH, adsorbate concentration, contact time, and temperature. The maximum adsorption capacity of rice husk silica and amine-functionalized rice husk silica was 25.975 and 82.345 mg/g, respectively. The adsorption process of metanil yellow dye onto rice husk silica followed Langmuir isotherm model. Besides, the adsorption of metanil yellow dye onto amine-functionalized rice husk silica was fitted to both Langmuir and Freundlich isotherm models (R2 = 0.99). The kinetic data were well described by the pseudo-second-order (R2 = 0.99) indicated a chemisorption process. The thermodynamic equation showed that the adsorption of metanil yellow dye onto rice husk silica was spontaneous through an endothermic reaction, while the adsorption onto amine-functionalized rice husk silica was spontaneous through exothermic reaction.

Trace samarium doped graphitic carbon nitride photocatalytic activity toward metanil yellow dye degradation under visible light irradiation

In this study, graphitic carbon nitride (g-C3N4) is synthesised under the optimised conditions and doped with samarium. The synthesised photocatalysts were characterized using appropriate techniques and applied for the photodegradation of metanil yellow (MY) dye under visible light irradiation. The UV–vis spectrometry and UHPLC/Q-TOF-MS were used to determine and identify MY photodegradation rate and intermediate products, respectively. From this study, the highest photodegradation of MY achieved after 6 h reaction time was 93 and 87 % using samarium doped g-C3N4 at pH 3 and 6.4, respectively. From the pH studies, acidic pH was found convenient for fast photodegradation. While scavenger studies showed superoxide radicals are the main species responsible for photodegradation of MY. Furthermore, the intermediate products were identified and the photodegradation mechanisms are proposed. Overall, based on the amount of photodegraded MY and reusability studies, the synthesised photocatalyst is efficient and stable for MY photodegradation.

Cauliflower shaped CdO:Mo nanostructures with enhanced photocatalytic activity against the degradation of metanil yellow dye

The present work reports the improvement in the structural, optical, electrical and photocatalytic properties of molybdenum doped CdO (CdO:Mo) thin films deposited on glass substrates by spray pyrolysis technique. XRD patterns reveal a strong (1 1 1) preferential orientation for the CdO:Mo thin films. Cauliflower shaped nanostructures were evinced with Mo doping. EDX and XPS analyses confirmed the presence of Mo in the doped films The doped films exhibit better transparency with the band gap being varied from 2.46 eV to 2.56 eV with increase in Mo doping concentration. The doped films exhibit better photodegradation efficiencies against the decolorization of metanil yellow due to enhanced energy transfer. Among the doped films, a remarkable efficiency of 87.3 % was observed for the 2 wt% Mo-doped CdO catalyst. Also, the more stable and reusable nature makes CdO:Mo catalysts suitable for practical applications for the degradation of toxic dyes.

Shrimp shell (Metapenaeus monoceros) waste as a low-cost adsorbent for metanil yellow dye removal in aqueous solution

Shrimp shell (Metapenaeus monoceros) waste as a low-cost adsorbent for metanil yellow dye removal in aqueous solution

Visible light mediated photocatalytic activity of Ni-doped Al2O3 nanoparticles

Visible light mediated photocatalytic activity of Ni-doped Al2O3 nanoparticles synthesized via precipitation method has been reported in this paper. Ni doping concentration in Al2O3 is varied as 0, 2, 4 and 6 wt%. The presence of diffraction peaks related to monoclinic crystal structure of θ- Al2O3 is evinced from the XRD patterns of the undoped and doped samples. The diffraction peak (0 0 2) appears to be dominant for all the samples and crystallite size decreased from 41 nm to 33 nm with Ni doping. A shift towards higher wavelength in the absorption edge of pure Al2O3 is evinced with Ni doping. PL spectra confirm the presence of peaks related to oxygen vacancies in the samples. Photocatalytic activity tests performed against metanil yellow dye confirmed that the doped samples exhibit better degradation efficiency than the undoped sample. The 4 wt% Ni-doped Al2O3 catalyst exhibits a maximum degradation efficiency of 86.84% after 90 min visible light irradiation which was well acknowledged from its decreased crystallite size, band gap values and improved surface morphology. The results obtained confirmed that the Ni-doped Al2O3 nanoparticles are well suited as visible light mediated catalysts for the degradation of toxic organic dyes.

Hexadecyltrimethylammonium Bromide Surfactant-Supported Silica Material for the Effective Adsorption of Metanil Yellow Dye.

The adsorption behavior of an organic dye, metanil yellow (My), from water using micro–nano silica particles (MNSPs) was investigated. MCM-41-like (Mobil Composition of Matter No. 41) MNSPs were synthesized using tetraethoxy orthosilicate as a silica source and hexadecyltrimethylammonium bromide (CTAB) as a surfactant under basic conditions. Comparative studies were performed to assess the adsorption behaviors of the organic dye using the as-synthesized MCM-41 before the removal of CTAB and MCM-41, either after one, two, and three times of chemical etching or after calcination. My was adsorbed more effectively from water on the as-synthesized MCM-41 without the removal of the surfactant than on MCM-41 after the removal of the surfactant by chemical etching or calcination. In addition, MCM-41 after removing the surfactant by one-time chemical etching in the presence of hydrochloric acid also showed better adsorption of My from water than MCM-41 after removing the surfactant by further two and three times of chemical etching or calcination. For comparison, other kinds of dye molecules with different chemical structures such as methylene blue (Mb) and rhodamine B (Rb) were also used to check the possibility of adsorption of various dyes by the CTAB-supported MNSPs. To better understand the reason behind the adsorption phenomena, detailed studies on the kinetics and thermodynamics of adsorption of the MNSPs were performed. Excellent adsorption of My was observed at concentrations up to 100 mg L–1 at 25 °C, whereas the adsorption was lower at higher concentrations of the My dye. Furthermore, enhanced My dye adsorption was observed at higher concentrations by increasing the adsorption temperature. It can be concluded that the MNSPs exhibited efficient adsorption of My, when the MNSPs are used without the removal of the surfactant and any further modifications, suggesting that the surfactant played key roles in the effective adsorption of the anionic dye. The as-synthesized MCM-41 was, however, not a good adsorbent for cationic dyes such as Mb and Rb.

Simultaneous electrochemical solar power generation and storage using metanil yellow-formic acid as a new sensitizer-reductant couple in photogalvanic cells.

With the rapid commercialization of solar and wind power as supplements and potential substitutes of fossil fuels, the need for power storage techniques to render renewable energy sources impervious to climatic variations has gained significant importance recently. In addition to this requirement of power storage, photo-galvanic (PG) cells hold special significance because these photo-electrochemical devices are capable of simultaneous solar power generation and storage. PG cells with performance as high as 649.6 μW power (Ppp), 2250 μA current (isc), 1048 mV potential (Voc), 8.12% conversion efficiency (CE), and 59 minutes power storage capacity (as half-time, t0.5) have been reported under artificial and low illumination intensities. To enable PG cells, a future source of solar energy conversion, with storage as well, their efficiency must be improved further to a level comparable to that of photovoltaic cells. The metanil yellow dye (photo-sensitizer)-formic acid (reductant) couple has not been exploited to date for this purpose. Therefore, in the present study, the metanil yellow dye as a photosensitizer and formic acid as a reductant have been used in the presence of sodium lauryl sulfate surfactant and sodium hydroxide alkaline medium to further increase the solar energy conversion efficiency and storage capacity of PG cells. The present study reports greatly enhanced electrical performance (compared to earlier results for similar cells) of Ppp 822 μW, isc 6000 μA, Voc 1110 mV, CE 20.41%, and t0.5 105 minutes. On the basis of the redox potential and reported data, a plausible mechanism has also been proposed for the photo-generation of current in metanil yellow-formic acid photogalvanics.

A novel method for oxidative degradation of metanil yellow azo dye by hexacyanoferrate(III) ions.

In the present work, the degradation of metanil yellow, an azo dye, by hexacyanoferrate(III) ions (oxidant) in the aqueous alkaline medium has been investigated by kinetic-spectrophotometric method at λmax 435nm of the reaction mixture. The effect of various parameters such as the concentration of dye, oxidant, and solution pH on the reaction rate has been determined. The results show that the rate of degradation increases linearly with the increase in concentrations of oxidant and dye at optimum pH of 9.0 and constant temperature of 40±0.1°C. Thermodynamic parameters such as energy of activation, enthalpy of activation, entropy of activation, and energy of formation have been calculated by studying the reaction rate at four different temperatures, that is, 40-55°C. Based on the experimental results, a plausible reaction mechanism involving complex formation has been proposed and a rate law has been derived. UV-Vis and LC-MS methods of analysis of degradation products show the formation of simpler and less hazardous degradation products. PRACTITIONER POINTS: It is also observed that the time required for azo dye degradation by the present method is about ten times less than the reported methods. Thus degradation of azo linkage and formation of simple and less hazardous products (efficient degradation of dye) makes it a novel method.

BIOSORPTION OF METANIL YELLOW DYE FROM AQUEOUS SOLUTIONS BY THE ENTIRE WATER HYACINTH PLANT (Eichhornia crassipes) AND ITS VEGETATIVE ORGANS

This study explored the kinetics of metanil yellow (MY) dye biosorption onto the water hyacinth plant (Eichhornia crassipes) and its vegetative organs (leaves, roots, and stems). The water hyacinth s leaves exhibited the highest capacity for and initial volumetric rate of MY biosorption, followed by the entire plant, roots, and stems. Modeling the kinetics for MY biosorption onto the entire plant and vegetative organs showed that the best agreement of experimental data was achieved with the pseudo-second-order kinetic model, suggesting that the rate-determining step in the overall reaction of MY biosorption onto the biosorbents might be chemisorption. Fourier-transform infrared spectroscopy studies suggest that the amide I and II functional groups, which are present in the biosorbent proteins, participated in the biosorption of MY from aqueous solutions. A linear dependence of MY biosorption capacity at equilibrium on total protein content was observed, confirming that MY molecules bind to biosorbent proteins. Scanning electron and confocal laser scanning microscopy studies corroborated the presence of MY on the biosorbents surface.

Ice-templated graphene oxide/chitosan aerogel as an effective adsorbent for sequestration of metanil yellow dye

Graphene oxide/chitosan aerogel (GOCA) was prepared by a facile ice-templating technique without using any cross-linking reagent for metanil yellow dye sequestration. The adsorption performance of GOCA was investigated by varying the adsorbent mass, shaking speed, initial pH, contact time, concentration and temperature. The combined effects of adsorption parameters and the optimum conditions for dye removal were determined by response surface methodology. GOCA exhibited large removal efficiencies (91.5–96.4%) over a wide pH range (3–8) and a high adsorption capacity of 430.99 mg/g at 8 mg adsorbent mass, 400 mg/L concentration, 35.19 min contact time and 175 rpm shaking speed. The adsorption equilibrium was best represented by the Langmuir model. GOCA could be easily separated after adsorption and regenerated for re-use in 5 adsorption-desorption cycles thereby maintaining 80% of its adsorption capability. The relatively high adsorption and regeneration capabilities of GOCA render it an attractive adsorbent for treatment of azo dye-polluted water.

CdO[sbnd]Al2O3 – A composite material with enhanced photocatalytic activity against the degradation of MY dye

The present work aims to synthesize CdOAl2O3 nanocomposite and to study its visible light activated photocatalytic performance against metanil yellow dye. Precipitation method was employed to synthesize pure CdO, Al2O3 and CdOAl2O3 nanoparticles. Diffraction peaks related to cubic CdO and monoclinic θ-Al2O3 were observed in the XRD pattern of the composite. XPS spectrum confirmed the presence of Cd, Al and O in the composite. Peaks related to CdO and OAlO bonds were observed from the FTIR spectrum of the composite. Photocatalytic activity confirmed that the CdOAl2O3 nanocomposite exhibits a maximum degradation efficiency of 82.09% against MY dye which was found to be better than pure CdO and Al2O3 nanoparticles due to the synergistic effect, high surface area and the formation of p-n junction at the interface of CdO and Al2O3. The CdOAl2O3 composite catalyst synthesized via precipitation method seems to be more stable and definitely it will be a potential candidate in photocatalysis related field.

Isotherm and Kinetic Studies on the Adsorptive Removal of Metanil Yellow and Neutral Red Dyes Using Copper Oxide

Isotherm and Kinetic Studies on the Adsorptive Removal of Metanil Yellow and Neutral Red Dyes Using Copper Oxide

Engineering cellulose fibre inorganic composites for depth filtration and adsorption

Abstract Depth type composite filters are porous materials heavily loaded with adsorbents and can remove contaminants from liquids by combining mechanical entrapment and adsorption. There is still a need for developing high performance filters by controlling the internal structure at micro and nano level. In this study, highly fibrillated nanocellulose (NC) with increased surface area was used as partial substitute for the fibre matrix to tailor the filter structure as well as the adsorption and filtration performance. Polyamide-amine-epichlorohydrin (PAE) was added both to adjust the charge of medium and provide wet strength. Filters were fabricated by embedding perlite particles into the cellulose fibre matrix by papermaking technique. The structure of composites was characterized for pore size distribution and surface morphology. Adsorption and filtration characteristics were quantified using two model dyes and silicon dioxide particles. Adsorption was found to be electrostatically controlled and dependent on the charge of the dye molecules and the filter medium. The addition of NC doubled the removal of a cationic dye by increasing the surface area and the available negative charges; it however decreased the removal of an anionic dye by 75%. PAE addition decreased the adsorption of the cationic methylene blue dye, while increasing the adsorption of the anionic metanil yellow dye. Rejection by filtration of 1 µm particles was over 90% for all filters. This study demonstrates that highly fibrillated NC fibres combined with a cationic wet strength polyelectrolyte can be used to tailor the filter structure and properties.

Role of b-Cyclodextrin in Enhanced Photocatalytic Decolorization of Metanil Yellow Dye with TiO2

Role of b-Cyclodextrin in Enhanced Photocatalytic Decolorization of Metanil Yellow Dye with TiO2

Novel and sustainable precursor for high-quality activated carbon preparation by conventional pyrolysis: Optimization of produce conditions and feasibility in adsorption studies

The purpose of this study is to produce powdered activated carbon under optimized conditions from a novel precursor, carob (Ceratonia siliqua L.) industrial processing residues, by zinc chloride (ZnCl2) chemical activation. The production influences of impregnation ratio (ZnCl2/precursor, g g−1), carbonization temperature, and carbonization duration on the some textural properties of produced carbons have been investigated and the best production conditions were determined. The optimum conditions resulted in an activated carbon with a carbon content of 58.95% and a yield of 48.83%, while the surface area of 1693 m2 g−1, with the total pore volume of 2.655 cm3 g−1, mesoporosity of 98.95% and average pore diameter of 6.70 nm. Its adsorptive performance was tested using methylene blue and metanil yellow dyes. The adsorption behaviors for both dyes were well described by the Langmuir isotherm model, showing a monolayer adsorption capacity of 597 mg g−1 and 568 mg g−1, respectively. The results indicate that optimal activated carbon could be employed as an efficient adsorbent for the removal of the basic and acidic dyes from effluents.

Adsorption of Methylene Blue and Metanil Yellow Dyes by Modified Carbon Sorbents

Adsorption properties of carbon sorbents modified with glycolic and lactic acid oligomers and copolymers of these toward organic dyes of varied nature: Methylene Blue and Metanil Yellow were studied. Differences in the adsorption of the dyes by the modified sorbents, due to the nature of their surface, were found.

Photocatalytic study for fabricated Ag doped and undoped MgFe2O4 nanoparticles

In the present study, spinel type Ag doped and undoped MgFe2O4 nanoparticles (Nps) were synthesized successfully by simple solution combustion synthesis, which shows excellent performance as a photocatalyst for dye decomposition. Structural composition and morphological features were studied by PXRD, FTIR and SEM. Study revealed that the prepared Nps showed simple cubic phase. The Egap of undoped and Ag doped MgFe2O4 Nps were determined by UV-VIS spectrometer. The photocatalytic process was accomplished in terms of percentage decomposition under visible light irradiation. EIS spectra revealed that Ag doped MgFe2O4 has the efficient charge separation and best charge transfer rate. The degradation of Metanil Yellow dye is enhanced by Ag doped MgFe2O4 than undoped MgFe2O4 Nps this could be attributed to smaller crystalline size, narrow band gap and high light harvesting ability. The photocatalyst synthesized here exhibited reusability with excellent efficiency.