Remazol Brilliant Orange 3R Research Articles

Production of oil palm frond activated carbon by microwave-assisted phosphoric acid activation for removal of Remazol Brilliant Orange 3R: Response surface methodology optimization

Production of oil palm frond activated carbon by microwave-assisted phosphoric acid activation for removal of Remazol Brilliant Orange 3R: Response surface methodology optimization

Fe3O4-functionalised biochar for persulphate systems towards the removal of Remazol Brilliant Orange 3R: machine learning–based approach and toxicity analysis

Fe3O4-functionalised biochar for persulphate systems towards the removal of Remazol Brilliant Orange 3R: machine learning–based approach and toxicity analysis

Effective removal of remazol brillinat orange 3R using a biochar derived from Ulva reticulata

ABSTRACT Marine seaweed is considered as one of the efficient tools for the mitigation of carbon dioxide and it is naturally overgrown in India. Biochar produced from seaweeds will remediate the toxic pollutants present in the soil and wastewater. The current investigation examined the potential of biochar synthesized from Ulva reticulata for the decolorization of Remazol Brilliant Orange 3 R (RBO3R). An up-flow-packed bed column is designed to check the feasibility of the effluent treatment in a real wastewater system. The partition coefficient was calculated to elucidate the optimal initial RBO3R concentration that has the highest affinity toward the biochar and the column operating parameters namely sorbent bed depth, flowrate and the initial RBO3R concentration were also studied. To validate the experimental data mathematical models namely the modified dose-response model (MDR) and Yoon Nelson model (YN) were developed. The results concluded that the removal efficiency of 69.08% and sorption capacity of 0.1046 mmol/g was obtained. The biochar potential has been assessed by conducting three sorptions and an elution cycle continuously using 0.01 M sodium hydroxide as the elutant.

Optimization of process conditions using RSM and ANFIS for the removal of Remazol Brilliant Orange 3R in a packed bed column

The current investigation explored the potential of biochar produced from Ulva lactuca to continuously adsorb Remazol Brilliant Orange 3R (RBO3R) in a packed bed column. The influencing parameters namely sorbent bed depth, the flowrate of the solute and the initial RBO3R concentration were studied. The process conditions were optimized using the Box Behnken method Response Surface Methodology (RSM) and also the experiment results were predicted using Adaptive Neuro-Fuzzy Interface System (ANFIS). A comparison study was analyzed using statistical error analysis, boxplot and cluster analysis. The experimental results concluded that a correlation coefficient of 0.9981 and 0.9999 was obtained for RSM and ANFIS predictive models. The removal efficiency of 68.6% was obtained at optimum conditions of 15 ​cm sorbent depth, 0.45 ​L/h flowrate and 0.25 ​mmol/L initial RBO3R concentration.

Cloning, Expression, and Characterization of Novel Laccase Enzyme from Native Bacillus subtilis Strain OH67

Bacterial laccases are very stable at high temperature and high pH values, and have many biotechnological and industrial applications. Here we describe how we cloned, expressed and purified the laccase from Bacillus subtilis (B. subtilis). The enzyme molecular weight has been determined as 34 kDa in SDS-PAGE analysis. The activity of the recombinant enzyme has been proved by guaiacol oxidation. The KM and Vmax values of the enzyme were at 1.1077 mM and at 19.3 μmol/min/mg, respectively. The recombinant laccase was effective in the decolorization of Turquoise blue HF6, Remazol red 106, Remazol brilliant orange 3R, and Brilliant blue, thus, possessing the characteristics necessary for its possible application in textile and environmental industries.

Comparative Desorption Studies on Remediation of Remazol Dyes Using Biochar (Sorbent) Derived from Green Marine Seaweeds

AbstractIn this work, regeneration of Remazol dye loaded biochar produced from three different green marine seaweeds namely U.lactuca, U.reticulata and C.scalpelliformis was studied using different elutants as a regenerant. Before the regeneration, remediation of remazol dyes were studied in batch trails and U. Lactuca derived biochar is found to best ‐suited biochar for the remediation all four remazol dyes with a removal efficiency in the order of Remazol brilliant orange 3R (91%), followed by Remazol brilliant blue R (89.6%), Remazol brilliant violet 5R (84.2%) and Remazol Black B (77.8%). Further Remazol brilliant orange 3R is studied for the remediation of real wastewater and also continuous remediation of dyes is performed. The present work aspires to find the best regenerant for dye loaded biochars. From the investigation NaOH(0.01 M) is found to be the best elutant for all the three different biochars. Desorption efficiency for U. lactuca biochar loaded remazol dyes were between 99.3 to 99.7%, U. reticulate biochar loaded remazol dyes were between 99.4 to 99.8% and for C. scalpelliformis biochar loaded remazol dyes were between 99.2 to 99.6%. The impacts of S/L ratio on the elution efficiency of NaOH towards dye‐bounded biochar were examined. The results indicated that elution efficiency of NaOH remain unaltered until S/L ratio=5 and additional enhancement of S/L ratio caused significant decrease in elution efficiency for all systems.

Remediation of complex remazol effluent using biochar derived from green seaweed biomass

The unique property of biochar, synthesized from a green seaweed (Ulva lactuca), to remediate complex Remazol dye bearing wastewater was investigated. Preliminary trials were targeted to explore the remediation capacity of biochar towards each of Remazol dyes (Remazol brilliant blue R (RBBR), Remazol brilliant orange 3R (RBO3R), Remazol brilliant violet 5R (RBV5R), and Remazol Black B (RBB)) in single-solute system. The results show that equilibrium pH played a vital part with maximum sorption observed at pH 2.0. The isotherm experiments confirmed that biochar exhibited high uptakes of 0.301, 0.292, 0.265, and 0.224 mmol/g for RBO3R, RBBR, RBV5R, and RBB, respectively. Due to the presence of multiple dyes as well as high concentration of auxiliary chemicals, the performance of biochar to remediate Remazol effluent was inhibited markedly compared to single solute systems. Nevertheless, the dye removal efficiency was above 77.5% and the decolorization rate was high with more than 95% of total dye decolorization completed within 240 min. Our results provide novel insights into the potential of biochar to remove Remazol dyes from complex dye wastewaters.

The Investigation of the Removal of Reactive Orange 16 DYE From Textile Wastewater by Using Electrocoagulation Process

Treatment of textile wastewater by electrocoagulation using Al and Fe electrodes was aimed in this study. Removal of color, chemical oxygen demand (COD) and turbidity from Remazol Brilliant Orange 3R Spec Gran (Reactive Orange 16) reactive textile dyestuff solutions was investigated in the study. For this purpose, effects of pH, current density, conductivity and operating time on process performance have been researched in an electrochemical reactor in which parallel connected monopolar aluminum and iron electrodes were used. Furthermore, operating costs depending on energy and electrode consumption were calculated. Optimum conditions for electrocoagulation process using aluminum electrode have been determined to be pH:6, current density:100A/m2, conductivity:500µS/cm and operating time:20min. 79,5% color, 60,2% COD and 91,9% turbidity removal efficiencies were obtained under these conditions. Optimum experimental conditions, for the iron electrode, have been determined to be pH:8, current density:75A/m2, conductivity:1000µS/cm and operating time:20min which resulted in 99,07% color, 42,26% COD and 91,89% turbidity removal efficiencies. Operational costs for aluminum and iron electrodes were calculated to be 1,489$/m3 and 0,504 $/m3 respectively.

Green and eco-friendly synthesis of cobalt-oxide nanoparticle: Characterization and photo-catalytic activity

Cobalt-oxide nanoparticles (NPs) were fabricated using Punica granatum peel extract from cobalt nitrate hexahydrate at low temperature. The synthesized cobalt-oxide NPs were characterized using X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray, atomic force microscopy, fourier transform infrared spectroscopy and UV-visible techniques. The cobalt-oxide NPs were in highly uniform shape and size was in the size of 40–80nm. Photo-catalytic activity (PCA) of the synthesized NPs was evaluated by degrading Remazol Brilliant Orange 3R (RBO 3R) dye and a degradation of 78.45% was achieved (dye conc. 150mg/L) using 0.5g cobalt-oxide NPs for 50min irradiation time. In view of eco-benign and cost-effective nature, the present investigation revealed that P. granatum could be used for the synthesis of cobalt-oxide NPs for photo-catalytic applications.

Broadband Photocatalytic Activity of Mesoporous Cd(II)‐Doped TiO2

AbstractMesoporous Cd(II)‐doped TiO2 nanoparticles are prepared with various Cd contents through a micelle‐mediated hydrothermal method. The as‐prepared 5 %‐Cd(II) doped TiO2 photocatalysts possess highly organized crystallites with large surface area of 389.05 m2/g, and further display the broadband absorption capability extended toward visible region. The involving photocatalytic phenomena of degrading two kinds of non‐biodegradable azo dyes, Remazol Black 5 and Remazol Brilliant Orange 3R, were kinetically modeled, manifesting the fact that the involving photo‐degradation of these different dyes is in accordance with the second‐order kinetic model. With the optimized doping of Cd ions, the photocatalysts possess the tailored mesoporous architectures, leaving the substantially active sites in photocatlytic processs, along with efficient charge separation of photogenerated carriers due to additional trap levels in TiO2 band structures, further provide the improved capability of dye removal.

Photocatalytic degradation of remazol brilliant orange 3R using wet-chemically prepared CdO-ZnO nanofibers for environmental remediation

Photocatalytic degradation of remazol brilliant orange 3R using wet-chemically prepared CdO-ZnO nanofibers for environmental remediation

Photocatalytic decolorization of Remazol Black 5 and Remazol Brilliant Orange 3R by mesoporous TiO2

Mesoporous TiO2 microparticles (TiO2-11) were prepared through the micelle hydrothermal method using a 1:1 M ratio of 1-tetradecylamine:Ti(OiPr)4. TiO2-11 microparticles exhibited significantly higher decolorization percentage of Remazol Black 5 (RB5) and Remazol Brilliant Orange (3R) dyes than other TiO2 microparticles formed with different molar ratios of 1-tetradecylamine:Ti(OiPr)4, and P25 and anatase TiO2. The results showed that the decolorization of the dyes by the microparticles was affected by the different irradiation wavelengths, catalyst dosages, dye concentrations, initial pH values, as well as electron acceptors. The kinetic experiments with varying initial pH values were in accordance with the second-order model. In addition, the adsorption study of the dyes in the dark fitted well with the Langmuir isotherm model. With the addition of 20 mmol/mL of three electron acceptors, H2O2, KBrO3, and (NH4)2S2O8, the decolorization of the RB5 and 3R dyes increased by 54% and 35%, 59% and 41%, and 36% and 33%, respectively. Hence, this technique for the preparation of the mesoporous TiO2 microparticles can facilitate more efficient decolorization of dyes in an aqueous solution.

Kinetics of the ozone oxidation of Reactive Orange 16 azo-dye in aqueous solution

Reactive azo-dyes present environmental concerns since they are persistent organics which are difficult to remove with conventional treatment processes. In this study, the ozonation of Reactive Orange 16 dye, C.I. 177757 (synonym Remazol Brilliant Orange 3R) was investigated at different experimental conditions in a semi-batch ozone reactor (25–100 mg/L dye; 20–80 g/m 3 NTP O 3 gas (NTP: 0 °C and 1 atm); pH 2, 7, 11). Ozone was very effective to remove completely the colour within a short period of time (few minutes). High gas-phase ozone concentrations and low dye concentrations resulted in high decolourisation rates. The decolourisation of the dye has also improved as pH increased from 2 to 11. Direct ozone reactions are assumed to predominate and hydroxyl radicals formed as a result of ozone decomposition at high pH reacted mostly with the products of the main decolourisation reaction. The reaction was assumed second order and Danckwerts model was used to determine the values of its rate constant, k 2, at different pHs. Values of k 2 were 2.5 × 10 5, 3.2 × 10 5, and 1.4 × 10 6 L/mol s for pH values of 2, 7, and 11, respectively. The stoichiometric ratio of the reaction was found equal to 3 mol O 3/mol dye and a degradation pathway was proposed.

Equilibrium, kinetics and thermodynamic of Remazol Brilliant Orange 3R dye adsorption on coffee husk-based activated carbon

In this work, coffee husk based activated carbon (CHAC) was prepared by physicochemical activation for the removal of Remazol Brilliant Orange 3R (RBO3R) dye from aqueous solution. The effects of dye initial concentration, contact time, solution temperature and pH on RBO3R adsorption were investigated. Result showed that the adsorption of RBO3R was favorable at acidic pH. The adsorption uptake was found to increase with increase in initial RBO3R concentration, contact time and solution temperature. Langmuir isotherm model fitted well the adsorption equilibrium data with monolayer saturation capacity of 66.76 mg/g at 303 K. The adsorption kinetic was found to follow the pseudo-second-order kinetic model. Boyd plot indicated that the adsorption of RBO3R on CHAC was controlled by film diffusion. The adsorption process was found to be endothermic with the reaction mechanism follows a physisorption process.

Competitive biosorption of azo dyes from aqueous solution on the templated crosslinked-chitosan nanoparticles

The nanoparticles of templated crosslinked chitosan, ECH-RB5 and ECH-3R, were prepared through the imprinting process using Remazol Black 5 (RB5) and Remazol Brilliant Orange 3R (3R) dyes, respectively, as templates and ECH as a crosslinker. The nanoparticles exhibited significantly higher adsorption capacities of the dyes than other nanoparticles formed without a dye template and with three crosslinkers (ECH, GLA, and EGDE). The adsorption of the dyes on the nanoparticles was affected by the initial pH, dye concentration, and temperature. The results were in accordance with the second-order and the Langmuir adsorption models. Meanwhile, the E values of the dyes calculated using the Dubinnin-Radushkevich model revealed that the adsorption process may be due to the dual nature of the process, physisorption and chemisorption, and that adsorption was predominant in the chemisorption process. The adsorption processes in the nanoparticles were spontaneous and exothermic. Moreover, competition adsorption through analysis of the intraparticle diffusion model apparently favored the 3R dye more than the RB5 dye on the nanoparticles in mixture solution B. The nanoparticles for the adsorption of the dyes were regenerated efficiently through the alkaline solution and were then reused for dye removal.

Urea/alkali‐free printing of cotton with reactive dyes

Urea reduction or elimination in reactive dye print pastes is of ecological interest. Sodium edetate is presented as a complete substitution of urea in the conventional print paste of reactive dyes, namely CI Remazol Black B and Remazol Brilliant Orange 3R using a constant amount of sodium alginate as the thickening agent. Three different print pastes containing urea/NaHCO3, sodium edetate/NaHCO3 and sodium edetate were thoroughly investigated. Different factors that may affect the printability of cotton, such as the concentrations of sodium edetate, urea, dye, absence or presence of alkali and steaming time in the prints obtained were evaluated with respect to the dye fixation, colour strength, dye penetration, levelling and the fastness properties. Excellent to good fastness was obtained for all samples irrespective of the print paste used.

Avaliação dos tratamentos eletroquímico e fotoeletroquímico na degradação de corantes têxteis

This paper presents the study of the oxidation of three textile dyes (Remazol black B, Remazol Brilliant Orange 3R and Remazol Golden Yellow RNL) using electrochemical and photoelectrochemical methods. In both methods, electrolysis experiments were performed at a current density of 50 mA cm-2 in an aqueous solution of each dye (30 mg L-1), using a photoelectrochemical flow-cell. For all the dyes studied, the photoelectrochemical method was demonstrated to be more efficient than the electrochemical one. Photoelectrochemical oxidation resulted in complete decoloration after 90 min of electrolysis and total organic carbon (TOC) removal reached up to 36%. It was observed that the dyes presenting chromophores at higher wavelengths are removed the quickest, which indicates that photosensitised (photoassisted) oxidation occurs. The level of color was reduced to levels below the standards presented in the literature, which indicates the viability of the photoelectrochemical process as part of the treatment of textile effluents.

Microbial decolorization of reactive azo dyes in a sequential anaerobic–aerobic system

A sequential anaerobic–aerobic treatment process based on mixed culture of bacteria isolated from textile dye effluent-contaminated soil was used to degrade reactive azo dyes Remazol Brilliant Orange 3R. Remazol Black B and Remazol Brilliant Violet 5R. Treating synthetic dye wastewater with the combination anaerobic and aerobic process showed that the majority of colors were removed by the anaerobic process, on the other hand the majority of chemical oxygen demand (COD) was removed in the subsequent aerobic process. Samples from combined anaerobic–aerobic system at the beginning of anaerobic process, after anaerobic process and after subsequent aerobic process were analyzed by high performance liquid chromatography (HPLC). The results suggested that under anaerobic conditions, the azo dyes were reduced and the aromatic amines were generated by the bacterial biomass. After re-aeration of the synthetic dye wastewater, these amines were further degraded by the same isolates. Thus, total degradation of reactive azo dyes was achieved by using an anaerobic–aerobic treatment.

Adsorption of Some Textile Dyes onto Crosslinked Poly(N-Vinylpyrrolidone)

The adsorption of some textile dyes such as Indigosol Blau IBC, Iyozol Turkish G, Iyozol Black B, Remazol Brilliant Orange 3R, Remazol Brilliant Violet 5R, Remazol Blau 3R, Sumufix Red 3BF and Everzol Yellow 4GL with crosslinked poly(N-vinylpyrrolidone) was investigated. Adsorption of these textile dyes onto crosslinked poly(N-vinylpyrrolidone) was studied by batch adsorption techniques at 25°C. The adsorption isotherms obtained were L-type (Langmuir-type) according to the Giles classification system. Adsorption studies indicated that monolayer coverage of the crosslinked poly(N-vinylpyrrolidone) by the dyes studied increased in the order: Indigosol Blau IBC > Iyozol Turkish G > Sumufix Red 3BF > Iyozol Black B > Remazol Brilliant Orange 3R > Remazol Blau 3R > Everzol Yellow 4GL > Remazol Brilliant Violet 5R. Values of the removal efficiency of the dyes ranged from 21% to 81%.

Photoelectrocatalytic degradation of Remazol Brilliant Orange 3R on titanium dioxide thin-film electrodes

Degradation of reactive dye Remazol Brilliant Orange 3R (RBO) has been performed using photoeletrocatalysis. A biased potential is applied across a titanium dioxide thin-film photoelectrode illuminated by UV light. It is suggested that charges photogenerated at the electrode surface give rise to chlorine generation and powerful oxidants (OH ) that causes the dye solution to decolorize. Rate constants calculated from color decay versus time reveal a first-order reaction up to 5.0×10 −5 mol l −1 in dye concentration. The best experimental conditions were found to be pH 6.0 and 1.0 mol l −1 NaCl when the photoelectrode was biased at +1 V (versus SCE). Almost complete mineralization of the dye content (70% TOC reduction) was achieved in a 3-h period using these conditions. Effects of other electrolytes, dye concentration and applied potentials also have been investigated and are discussed.