Adsorption Behavior Of Methyl Orange Research Articles

Porous Hierarchical Ni/Mg/Al Layered Double Hydroxide for Adsorption of Methyl Orange from Aqueous Solution.

A basic urea technique was successfully used to synthesize Mg/Al-Layered double hydroxides (Mg/Al LDHs), which were then calcined at 400 °C to form Mg/Al-Layered double oxides (Mg/Al LDOs). To reconstruct LDHs, Mg/Al LDOs were fabricated with different feeding ratios of Ni by the co-precipitation method. After synthesis, the Ni/Mg/Al-layered double hydroxides (NMA-LDHs) with 20% and 30% Ni (S1 and S2) were roasted at 400 °C and transformed into corresponding Ni/Mg/Al-layered double oxides (NMA-LDOs) (S1a and S2b, respectively). The physiochemical properties of synthesized samples were also evaluated by various characterization techniques, such as X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared (FTIR), and Brunauer, Emmett, and Teller (BET). The adsorption behavior of methyl orange (MO) onto the synthesized samples was evaluated in batch adsorption mode under varying conditions of contact time, adsorbent quantity, and solution pH. As the dosage amount increased from 0.01-0.04 g, the removal percentage of MO dye also increased from 83% to 90% for S1, 84% to 92% for S1a, 77% to 87% for S2, and 93% to 98% for S2b, respectively. For all of the samples, the adsorption kinetics were well described by the pseudo-second-order kinetic model. The equilibrium adsorption data were well fitted to both Langmuir and Freundlich models for methyl orange (MO). Finally, three adsorption-desorption cycles show that NMA-LDHs and NMA-LDOs have greater adsorption and reusability performance for MO dye, signifying that the design and fabrication strategy can facilitate the application of the natural hydrotalcite material in water remediation.

Efficient removal of dyes from water by zirconium-based metal-organic cages with varying functional groups

The adsorption of organic dyes from wastewater is an efficient approach to reduce dye pollution for water resources and land. Herein, a series of zirconium-based metal-organic cages (Zr-MOCs) with different functional groups, ZrT-1, ZrT-1-Br, ZrT-1-NH2 and ZrT-1-OH, were synthesized by solvothermal that can be applied to remove methyl orange (MO) and rhodamine B (RhB). The adsorption kinetics of Zr-MOCs was fitted well by pseudo-second-order. ZrT-1 exhibits the most excellent adsorption ability for MO and RhB compared with the other Zr-MOCs due to the highest pore volume. Interestingly, Zr-MOCs can remove both anionic dye (MO) and cationic dye (RhB) due to the synergistic interplay between pore volume, electrostatic interaction, π-π interaction and hydrogen bonding. The adsorption behaviors of MO and RhB on ZrT-1 are suitable to the Langmuir model that belong to the monolayer adsorption. The maximum adsorption capacities for MO and RhB towards ZrT-1 are 190 mg/g and 227 mg/g at 25 °C, pH=7 and the initial dye concentration of 80 mg/L, respectively.

Facile synthesis of magnetic-activated nanocomposites for effective removal of cationic and anionic dyes in an aqueous environment: An equilibrium isotherm, kinetics and thermodynamic studies

Contamination of wastewater with dye ions is a serious threat to the environment, thus making its removal exigent, for which adsorbent has proved very useful. In this study, magnetized activated carbon (MAC) was synthesized from eucalyptus leaves with simultaneous magnetization with K2CO3 and FeCl3 that increased the surface area and porosity of eucalyptus carbon (EC). The adsorption behavior of methyl orange (MO) and methylene blue (MB) by MAC was investigated and characterized before and after the adsorption to investigate the effects of pH, initial dye ion concentration, MAC dose, adsorption time and temperature on the adsorption effect. The results showed that the amount of MO adsorbed on MAC increased from 50 mg/g to 205 mg/g, and the amount of MB adsorbed increased from 50 mg/g to 289 mg/g with the increase of the initial concentration. The results of the fitted adsorption process are consistent with the pseudo-secondary, Langmuir and D-R models, which indicate a predominantly chemisorption accompanied by physical adsorption and monolayer adsorption, a spontaneous heat absorption process that may occur through ion exchange, electrostatic interaction and surface complexation. The high adsorption capacity and magnetic properties of MAC make it a potential adsorbent for dye wastewater treatment.

Controllable synthesis of cubic magnetic MgFe2O4 derived from MgFe-LDHs for efficient removal of methyl orange

A novel cubic magnetic MgFe2O4 derived from MgFe-layered double hydroxides (MgFe-LDHs) has been constructed by a combination of facile urea hydrothermal method and calcinations method and applied for the efficient removal of methyl orange (MO) with a maximum adsorption capacity of 535 mg g−1. The studies of formation mechanism of cubic MgFe-LDHs demonstrate the type of ferric salt and reaction time are two most important parameters influencing their cubic structures. Besides, calcinations temperature can not only decide magnetic performance of MgFe2O4, but also not change its cubic structure. Then the structural and surface properties of cubic magnetic MgFe2O4 were investigated by various characterization techniques. In addition, batch adsorption experiments were carried out to investigate the effects of different parameters such as the initial concentration of MO, pH, temperature and time on the adsorption behavior of MO on MgFe2O4. The kinetics, isotherm and thermodynamics of the adsorption of MO by MgFe2O4 were studied in detail. Moreover, adsorption mechanism of MO by MgFe2O4 was studied deeply. At last, MO could be desorbed from MgFe2O4 by 0.1 M NaOH solution and reused at least three times, indicating cubic magnetic MgFe2O4 is an effective and promising adsorbent for the removal of dye pollutants.

Thermodynamics and Kinetic Studies for the Adsorption Process of Methyl Orange by Magnetic Activated Carbons

This study investigates the adsorption behavior of methyl orange (MO) by magnetic activated carbons (MACs) with different ratios of AC: Magnetite from aqueous solution. Batch experiments for MO adsorption were carried out for evaluating the thermodynamics and kinetics parameters onto the MAC adsorbents. Variables such as pH, initial concentration of the dye, contact time, and temperature have been analyzed. The physicochemical characteristics of MACs were analyzed by scanning electron microscopy (SEM), surface area analyzer (BET), and X-ray power diffraction. The results of SEM and BET analysis showed that MAC adsorbents present a porous structure and large surface area, suitable conditions for the adsorption process. The X-ray diffraction patterns of MACs revealed that the adsorbents possess magnetite as magnetic material. Adsorption kinetic studies carried out onto MACs showed that the pseudo-second-order model provides a good description of the kinetic process. The adsorption equilibrium results were well adjusted to the Langmuir isotherm, showing that the maximum adsorption capacity was for MACs with a ratio 3:1 and 2:1 AC/magnetite. Thermodynamic analysis declares that the adsorption process was established as spontaneous, endothermic, and physical adsorption in nature. The results of the this study indicated that MAC adsorbents can be used successfully for eliminating MO from aqueous solution.

Kinetic studies on adsorption behavior of methyl orange using modified halloysite, as an eco-friendly adsorbent

In this work, modified halloysite was successfully prepared and its adsorptive capacity was studied using methyl orange dye solution. The adsorption behavior was systematically performed as a function of initial dye concentration and time. The halloysite-mineral (Al2O3·2SiO2·4H2O) used in this study was an aqueous alumino silicate mineral consisting of layers with similar structural composition and was gathered from the Biga Peninsula, Western Anatolia. Characterization of the prepared material was examined using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Differential Thermal Analyzer (DTA). The adsorptive capacity of the modified halloysite in methyl orange was increased by increasing the contact time and initial dye concentration. Lagergren pseudo first-order and pseudo second-order kinetics were performed and pseudo second-order model was found to be the best fit model for the adsorption kinetic. Langmuir, Freundlich, Sips and Dubinin–Radushkewich isotherm models were applied to the experimental data to find the suitable model for describing the adsorption equilibrium. Unmodified-clay was also used in the adsorption process of methyl orange to compare the adsorptive property of the modified-clay. It was found that modified halloysite performed better as an adsorbent than untreated clay for the adsorption of methyl orange.

Performances and Mechanism of Methyl Orange and Congo Red Adsorbed on the Magnetic Ion-Exchange Resin

Effective removal of azo dyes is a stringent issue. In this study, the adsorption behaviors of methyl orange (MO) and congo red (CR) on the magnetic ion-exchange (MIEX) resin were investigated by b...

Adsorption behavior of methyl orange and methylene blue onto carbon material in an aqueous solution

Adsorption behavior of methyl orange and methylene blue onto carbon material in an aqueous solution

Efficient removal of anionic dyes from aqueous media using newly in situ synthesized triazine-based nitrogen-rich network-modified magnetic nanoparticles

In this research, a triazine-based polymeric network surface-modified magnetic nanoparticles (TPN/MNPs) were synthesized for the adsorption of anionic compounds. To obtain TPN/MNPs, melamine–terephthaldehyde polymeric network was synthesized in the presence of magnetic nanoparticles. After characterization by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and transmission electron microscopy (TEM), the adsorption behaviors of methyl orange (MO) as model anionic dye on TPN/MNPs were investigated. Obtained results showed MO removal efficiency has not been influenced by pH (5–9) and high salt concentration (up to 10% w/v) of the solution. The adsorption isotherm was described by Langmuir model. The results indicated that TPN/MNPs adsorbed MO effectively with a large capacity of 80.6 mg g−1. The adsorption reached the equilibrium within 10 min and the kinetics followed pseudo-second-order model. The magnetic separation after adsorption was easily achieved, and TPN/MNPs could be quantitatively regenerated by washing with 1.0 mL of the mixture of methanol/0.1 mol L−1 HCl (50:50, v/v%) solution. The results confirmed that TPN/MNPs have the potential superiority in removal of MO from aqueous solution.

Modification of montmorillonite by Gemini surfactants with different chain lengths and its adsorption behavior for methyl orange

To investigate the effect of the alkyl chain length of Gemini surfactants on the adsorption behavior of corresponding organoclays for azo dye methyl orange (MO) removal in aqueous solution, they were prepared by modifying Na-montmorillonite (Na-Mt) using a series of commercialized Gemini surfactants, [C12H25-N+(CH3)2-CH2]2·2Br− (G12-2-12), [C16H33-N+(CH3)2-CH2]2·2Br− (G16-2-16), and [C18H37-N+(CH3)2-CH2]2·2Br− (G18-2-18), which were characterized by identical spacer chain length and different alkyl chain lengths. The structure, morphology and surface properties of organoclays were characterized via XRD, FTIR, TG, SEM, and water contact angle. The results revealed that the interlayer space, hydrophobicity, and dispersibility of organoclays increased significantly with increasing the alkyl chain length of the Gemini surfactants. The adsorption behavior of MO from aqueous solution onto the organoclays was determined. The results indicated that the adsorption capacity of the organoclays was in the order: G16-2-16-Mt>G18-2-18-Mt>G12-2-12-Mt. The highest adsorption capacity of G16-2-16-Mt can be reasonably attributed to the suitable interlayer space, hydrophobicity, and interlayer packing density of the surfactants of G16-2-16-Mt. Moreover, the effects of the pH of the MO solution, adsorption temperature, contact time and the initial MO concentration on the adsorption capacity of MO on Gemini surfactant-modified Mt was also investigated. The adsorption capacity of G16-2-16-Mt decreased with increasing pH and exhibited a maximum at 30°C. The adsorption isotherms of MO onto G16-2-16-Mt and G18-2-18-Mt were in good agreement with the Langmuir equation, and the adsorption kinetics can best be described by a pseudo-first-order model.

Adsorption behavior of methyl orange onto an aluminum-based metal organic framework, MIL-68(Al).

MIL-68(Al), a powdered aluminum-based metal organic framework (MOF), was synthesized and used to explore its adsorption behavior toward methyl orange (MO). The adsorption isotherm, thermodynamics, kinetics, and some key operating factors as well as changes in the material's structure were investigated. The adsorption isotherm conformed to the Langmuir isotherm model and the maximum equilibrium adsorption capacity was 341.30 mg g-1. Thermodynamic data demonstrated that the adsorption process was spontaneous, endothermic and showed positive entropy. For kinetics, the process of MO adsorption onto MIL-68(Al) was more suitably described by a pseudo-second-order model. Electrostatic and hydrogen-bonding interactions contributed to dye adsorption, with electrostatic interactions considered to be the principal binding force between adsorbent and adsorbate. Furthermore, MIL-68(Al) maintained a stable structure after adsorption. From these results, MIL-68(Al) was suggested here to be a stable MOF adsorbent for removing MO from aqueous solution.

Room‐temperature Synthesis of Cu2O Nanostructures and Their Morphology‐dependent Adsorption Properties

Three different Cu2O nanostructures, namely porous nanospheres, nanoparticles, and nanocubes, were synthesized through a facile solution route at room temperature. Structure and morphology of the products were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), field‐emission scanning electron microscopy (FESEM), and nitrogen adsorption–desorption isotherms. The adsorption behavior of Methyl Orange (MO) onto these Cu2O nanostructures was investigated, considering the effect of initial methyl orange concentration and the additive amount of Cu2O products. The kinetic and equilibrium investigations suggested that the adsorption process of MO followed a pseudo‐second order rate equation and the Langmuir isotherm model. The maximum adsorption capacity of the three samples followed the sequence: porous nanospheres > nanoparticles > nanocubes, which was in accordance of the BET specific surface of the samples. In addition, further investigations indicated that the as‐prepared Cu2O nanostructures also show good adsorption properties for other anionic dyes including Congo red and Methyl blue.

Preparation of activated carbon using sea mango (Cerbera odollam) with microwave-assisted technique for the removal of methyl orange from textile wastewater

Sea mango (Cerbera odollam), a non-edible fruit which is abundantly available in Malaysia was transformed into a potential low-cost activated carbon for the removal of methyl orange (MO) (mono azo dye) from textile wastewater. The activated carbon was subjected to carbonization process at 200°C with nitrogen (N2), followed by chemical activation with phosphoric acid (H3PO4) and physical activation using microwaves at 500°C for 2 h. The Brunauer–Emmet and Teller surface area for the produced activated carbon was 1,437 m2/g. The effects of several operating parameters, such as activated carbon dosage, contact time; initial concentration, and pH at room temperature on the adsorption process of MO from simulated textile wastewater were evaluated. The minimum duration for the dye adsorption reached the equilibrium state was 60 min. Removal of dye in acidic solutions was preferred rather than in basic solution. Higher initial dye concentration performed better on dye removal than lower concentration. Adsorption behavior of MO on sea mango activated carbon was expressed by both Langmuir and Freundlich isotherms.

Sorption of Methyl Orange from Aqueous Solution on Chitosan Biomass

Many industries such as textile, pulp and paper, dyestuffs and plastics industries use dyes to color their products and discharge a considerable amount of colored wastewater into the environment. Dyes are recalcitrant molecules (particularly azo dyes), toxic and even carcinogenic and make a serious hazard to aquatic organisms. Therefore, it is necessary to eliminate them before discharging. This study investigates the adsorption behavior of Methyl orange (MO) from aqueous solution on chitosan biomass. In a preliminary study, the sorption of MO has been carried out as a function of shaking time, pH, dye concentration and temperature. The sorption of MO was characterized using SEM-EDAX and FT-IR spectroscopy. The equilibrium data on the Methyl orange fitted to both Langmuir and Freundlich isotherms, but the experimental data of the MO were found to be better fitted by the Freundlich model. Maximum sorption capacity reached up to 29mg g-1 at pH 3 was achieved within 60min. The sorption data were best fit with the pseudo-second-order kinetic model. These results indicate that chitosan is an interesting alternative for dye removal from the wastewater.

Adsorption property of methyl orange by chitosan coated on quartz sand in batch mode

The adsorption behavior of methyl orange (MO) on chitosan-coated quartz sand (CCS) was studied as a function of initial solution pH, salt concentration, contact time, concentration of MO, and temperature in batch mode. The adsorption quantity of MO on CCS was 45.5 mg g−1 at 293 K under the conditions of pH 4.00, CCS dosage 1.00g L−1, and contact time 720 min. The high temperature and existence of common salts in solution were disadvantage of MO adsorption. The equilibrium data were fitted well to the Langmuir and Temkin isotherm models. Pseudo-first-order kinetic model, pseudo-second-order kinetic model, Elovich equation, and intra-particle diffusion models were used to fit the kinetic experimental data, and the fitted results showed that Elovich equation was the best to predict the kinetic process. The adsorption was spontaneous and exothermic, according to the thermodynamic parameters. It was concluded that ion exchange occurs mainly in the adsorption process. The dye-loaded adsorbent can be reused by regeneration with hot water.

Studies on the adsorption behavior of methyl orange from dye wastewater onto activated clay

In this study, activated clay was used as adsorbent for the removal of methyl orange (MO) from aqueous solution in a batch system. Experiments were carried out as a function of contact time, initial concentrations of solution, adsorbent dosage, solution pH, and temperature, and consequently, optimum condition of adsorption was obtained. The equilibrium adsorption data of MO on activated clay were analyzed by Langmuir, Freundlich and Temkin isotherm models, the results indicate that Langmuir and Temkin models provide better correlation of the experimental data. The pseudo-first-order, pseudo-second-order and Elovich kinetics models were used to analyze the kinetics data obtained at different concentrations. Among the kinetics models studied, the pseudo-second-order model was the best applicable model to describe the adsorption of MO onto activated clay. The values of Gibbs free energy of adsorption (ΔG°) were found to be -7.462 kJ mol-1, the negative value indicated the spontaneity of the adsorption process of MO onto activated clay. The values of ΔH° and ΔS° were found to be -12.289 kJ mol-1 and -16.474 J mol-1 K-1, respectively. The negative value of ΔH° reveals the adsorption is exothermic, and the negative value of ΔS° suggests that the confusion degree of adsorption process is decreasing.

Adsorption behavior of methyl orange onto nanoporous core–shell Cu@Cu2O nanocomposite

In this work, the adsorption behavior of methyl orange onto nanoporous core–shell Cu@Cu2O nanocomposite has been investigated using an UV–vis spectrophotometer, considering the influence of pH value, temperature, additive amount of nanocomposite and initial methyl orange (MO) concentration. The adsorption kinetics of MO on the Cu@Cu2O nanocomposite has been discussed based upon the pseudo-first-order model, intraparticle diffusion model and Langmuir adsorption model. Thermodynamic parameters such as change in Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) have also been evaluated. The negative changes in Gibbs free energy (−18.4 to −15.1kJmol−1) and enthalpy (−51.5kJmol−1) indicate the spontaneous and exothermic nature of the adsorption process of MO. The activation energy (Ea) of 12.4kJmol−1 reveals the physisorption nature of MO adsorption onto the nanoporous Cu@Cu2O nanocomposite.

Development of a First-Order Kinetics Based Model, Equilibrium Studies, and Thermodynamics for the Adsorption of Methyl Orange onto a Lignocellulosic Anion Exchanger

The present article describes the adsorption behavior of methyl orange (MO) on polyacrylamide-grafted aminomethylated tamarind fruit shell anion exchanger. The optimum pH for MO removal was 3.0 and the equilibrium was attained within 2 h. The kinetic and isotherm data obtained at different pH and temperatures, could be fitted with the pseudo-first-order rate equation and the Sips isotherm model, respectively. The adsorption process was exothermic and spontaneous in nature. The decrease in isosteric heat of adsorption with increasing MO uploading on the adsorbent reflects the surface energetic heterogeneity of the adsorbent. The reusability of the adsorbent was demonstrated over 4 cycles using 0.2 M NaOH as the desorbing agent.

Adsorption Behavior and Kinetics of Methyl Orange in Water on Activated Carbon

The adsorption behavior of methyl orange aqueous solution was investigated on husk-based activated carbon. The effects of key factors, i.e., degassing pretreatment, adsorption time, temperature, adsorbent dosage and initial concentration, on the adsorption efficiency were measured. The kinetic adsorption curves and adsorption isotherms were fitted with theoretical model. The results show that the removal efficiency of methyl orange could be significantly improved by degassing pretreatment, prolonging the time, lowering temperature or reducing the initial concentration. In the context, adsorption equilibrium will be achieved up 90min. Furthermore, adsorption rate will be enhanced by the increase of the amount of activated carbon. In conclusion, adsorption isotherm and adsorption kinetics can be fitted well with Freundlich equation and pseudo-first Lagergren model, respectively.

Adsorption Performance and Mechanism in Binding of Azo Dye by Raw Bentonite

AbstractThe adsorption behavior of methyl orange (MO) from aqueous solution onto raw bentonite (RB) sample was investigated as a function of parameters such as pH, inorganic anion, contact time, and temperature. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. Langmuir adsorption capacity was found to be 34.34 mg/g at pH 4.0. The pseudo‐first‐order, pseudo‐second‐order kinetic, and the intra‐particle diffusion models were used to describe the kinetic data. The values of the energy (Ea), enthalpy (ΔH≠), and entropy of activation (ΔS≠) were calculated as 38.62 kJ/mol, 36.04 kJ/mol, and −150.05 J/mol K, respectively, at pH 4.0.