Adsorbent For Removal Of Methyl Orange Research Articles

Adsorptive removal of organic pollutants from aqueous solutions using novel GO/bentonite/MgFeAl-LTH nanocomposite

The contamination of water with organic pollutants such as dyes and phenols is a serious environmental problem, requiring effective treatment methods. In the present study, a novel nanocomposite was synthesized by intercalating graphene oxide and bentonite clay into MgFeAl-layered triple hydroxide (GO/BENT/LTH), which was characterized using different techniques. The adsorption efficacy of the GO/BENT/LTH nanocomposite was assessed via the removal of two harmful organic water pollutants, namely methyl orange (MO) and 2-nitrophenol (2NP). The obtained results revealed that the maximum adsorption capacities (qmax) of MO and 2NP reached 3106.3 and 2063.5 mg/g, respectively, demonstrating the excellent adsorption performance of the nanocomposite. Furthermore, this study examined the effects of contact time, initial MO and 2NP concentrations, pH, and temperature of the wastewater samples on the adsorptive removal of MO and 2NP by the GO/BENT/LTH nanocomposite. The pH, zeta potential, and FTIR investigations suggested the presence of more than one adsorption mechanism. Thermodynamic investigations elucidated the exothermic nature of the adsorption of MO and 2NP onto the GO/BENT/LTH nanocomposite, with MO adsorption being more sensitive to temperature change. Additionally, regeneration studies revealed a marginal loss in the MO and 2NP removal with the repetitive use of the GO/BENT/LTH nanocomposite, demonstrating its reusability. Overall, the findings of this study reveal the promise of the GO/BENT/LTH nanocomposite for effective water decontamination.

Methyl orange dye sequestration using polyaniline nanotube-filled sodium alginate bio-composite microbeads

Dye pollution is a significant problem in today's environmental protection, and bio-adsorbents have been getting a lot of attention in wastewater treatment because of their affordability, sustainability, and eco-friendly. Bio-based sodium alginate-polyaniline nanotube (SA-PANINT) composite microbeads were fabricated by a facile cross-linking with calcium chloride solution for the adsorptive removal of methyl orange (MO) dye. Depending on the amount of PANINT in the composite composition, SA-PANINT-10, SA-PANINT-20, SA-PANINT-30, and SA-PANINT-40 composite microbeads were prepared. Among these microbeads, SA-PANINT-30 composite microbeads gave the best results in experimental tests. The obtained SA-PANINT-30 composite microbeads were characterized by FTIR-ATR, SEM, XRD, and BET analyses, and the influence of dose (0.01 g/50 mL–0.15 g/50 mL), pH (2–12), time (0–210 min), and concentration (10–50 mg/L) on the adsorption of MO was examined. From the Langmuir isotherm model, under optimum conditions, the qm value of SA-PANINT-30 microbeads was determined as 370.4 mg/g at 25 °C. It was also obtained that the adsorption process followed the PSO model and the adsorption process took place chemically. From the thermodynamic parameters, the adsorption process for SA-PANINT-30 microbeads was found to be endothermic (ΔHo=24.09 kJ/mol) and spontaneous (ΔGo=−25.56 kJ/mol at 25 °C). Considering all these results, it was seen that the prepared composite microbeads can be used as a highly efficient, low-cost, sustainable, and potential adsorbent in the removal of synthetic anionic dyes from wastewater.

Adsorptive Elimination of Methyl Orange Dye over the Activated Carbon Derived from Bitter Almond Shells. An Isothermal, Thermodynamic, and Kinetic Study

Abstract: Bitter almond shells (BAS) were inspected as a low-cost precursor in producing activated carbon (AC) through the optimized ZnCl2 activation route. The raw BAS were impregnated with ZnCl2 at multiple ratios (1:1 - 3:1 ZnCl2:BAS), followed by carbonization at various temperatures (400 – 800 °C) for different durations (30 – 120 minutes) in a tubular reactor. The typical AC sample was prepared using a 1:1 ZnCl2:BAS impregnation ratio and activated at 500 °C for 60 minutes. The AC yield under those conditions was 23.46%. The BET surface area (SABET), Boehm titration method, point of zero charge (pHPZC), Field Emission-Scanning Electron Microscopy (FE-SEM), X-ray diffraction (XRD), Fourier Transform Infra-Red spectroscopy (FTIR), and Energy Dispersive X-ray (EDX) of the optimal AC sample were determined. The identification outcomes disclosed that this AC sample is mesoporous with SABET, iodine number, total pore volume, and average pore width of 1221.60 m2/g, 1444.23 mg/g,1.50 cm3/g, and 4.98 nm, respectively. The adsorptive removal of methyl orange (MO) dye from its aqueous phase by this AC was accomplished at various solution pH (2–10), different amounts of the AC (0.05-0.4 g), multiple initial concentrations (50–400 mg/L), variable temperature (10-50 °C) and varied contact time (0–420 min) in a batch- mode operation. The maximum monolayer adsorption capacity of 224.71 mg/g was obtained at 323 K, pH= 2.0, initial (MO) concentration of 400 mg/L, 0.25 g AC dose, and 420 minutes contact time. The kinetic outcomes best fitted to the pseudo-2nd -order kinetics model, while the MO equilibrium capacity obeyed the Langmuir model rather than other models. Thermodynamic studies of the MO adsorption by the BAS-derived AC disclosed that the adsorption was spontaneous and endothermic. The adsorption mechanism of MO by the declared AC mostly involved electrostatic attractions and hydrogen bonding interaction. This work demonstrates that BAS is an advantageous raw material for producing low-cost and effectual mesoporous AC carbon with substantive surface area.

Adsorptive removal of methyl orange from aqueous solution by hydrotalcite derived catalysts

Adsorptive removal of methyl orange from aqueous solution by hydrotalcite derived catalysts

MgAl-Layered Double Hydroxide: An Efficient Material for Adsorptive Removal of Methyl Orange from Aqueous Solutions

MgAl-Layered Double Hydroxide: An Efficient Material for Adsorptive Removal of Methyl Orange from Aqueous Solutions

Adsorptive removal of methyl orange and methylene blue from aqueous solutions with Acacia crassicarpa activated carbon

In this study, activated carbon prepared from Acacia crassicarpa barkwas prepared and studied for the potential development of low-cost, carbon-based adsorbents that remove industrial dyes from aqueous solutions. Various spectroscopy techniques and surface analyses were used to characterize the adsorbents. The adsorption of methyl orange (MO) and methylene blue (MB) onto the material was investigated under optimal experimental conditions including temperature, adsorbent dosage, and initial concentration of chemicals. The Langmuir isotherm model was observed to fit the adsorption data well. The maximum adsorption capacities predicted by the Langmuir isotherm were found to be 10.36 mg.g-1 for MO and 15.34 mg.g-1 for MB. The adsorbents were better able to remove the cationic dye than the anionic dye. The results of this study will be useful for future scale-up production of low-cost adsorbents using Acacia crassicarpa for the removal of cationic and anionic dyes.

Polyaniline-multiwalled carbon nanotubes (PANI- MWCNTs) composite revisited: An efficient and reusable material for methyl orange dye removal

This study discusses the fast and efficient adsorptive removal of methyl orange (MeO), a mutagenic azo dye and a significant water pollutant from dyeing industries, using PANI-MWCNTs composite. The composite prepared by in-situ oxidative polymerization was characterized using FT-IR, XRD and TEM techniques. The surface area of PANI-MWCNTs composite obtained from Brunauer-Emmett-Teller (BET) surface area analysis was 43.892 m2 g−1 and the nitrogen adsorption-desorption isotherms demonstrated the mesoporous structure of the material. In comparison to PANI and MWCNTs, PANI-MWCNTs composite exhibited superior performance as adsorbent. The MeO adsorption process followed pseudo-second-order kinetics (R2 ≥ 0.99) with a rate constant of 5.265 × 10−4 g mg−1 min−1 at 30 °C. The maximum adsorption capacity (qm) evaluated from the equilibrium data was 149.25 mg g−1 and the data concurred the best with Langmuir isotherm model. The values of Langmuir constant (RL) and Freundlich constant (1/n) were less than 1, revealing that the adsorption process is favourable. Furthermore, the used adsorbent showed excellent recyclability after it was regenerated using 1 M HCl.

Synthesis of DMEA-Grafted Anion Exchange Membrane for Adsorptive Discharge of Methyl Orange from Wastewaters.

This manuscript describes the synthesis of dimethylethanolamine (DMEA)-grafted anion exchange membrane (AEM) by incorporating dimethylethanolamine as ion-exchange content into the polymer matrix via the solution casting method. The synthesis of the DMEA-grafted AEM was demonstrated by Fourier transform infrared (FTIR) spectroscopy. The prepared DMEA-grafted AEM exhibited higher thermal stability, homogeneous morphology, water uptake (WR) of 115%, and an ion exchange capacity (IEC) of 2.70 meq/g. It was used for the adsorptive removal of methyl orange (MO) from an aqueous solution via batch processing. The effect of several operating factors, including contact time, membrane dosage, initial concentration of aqueous dye solution, and temperature on the percentage discharge of MO and adsorption capacity, was evaluated. Experimental data for adsorption of MO onto the DMEA-grafted AEM was analyzed with two parameter and three parameter nonlinear adsorption isotherm models but fitted best using a nonlinear Freundlich isotherm. Adsorption kinetics were studied by using several models, and attained results showed that experimental data fitted well to pseudo-second-order kinetics. A thermodynamic study showed that adsorption of MO onto the prepared DMEA-grafted AEM was an endothermic process. Moreover, it was a feasible and spontaneous process.

Adsorptive removal of methyl orange from wastewaters by the commercial anion exchange membrane EPTAC

Adsorptive removal of methyl orange from wastewaters by the commercial anion exchange membrane EPTAC

Development of triethanolamine functionalized-anion exchange membrane for adsorptive removal of methyl orange from aqueous solution

Development of triethanolamine functionalized-anion exchange membrane for adsorptive removal of methyl orange from aqueous solution

Synthesis and crystal structures of zinc(II) coordination polymers of trimethylenedipyridine (tmdp), 4-nitrobenzoic (Hnba) and 4-biphenylcarboxylic acid (Hbiphen) for adsorptive removal of methyl orange from aqueous solution

Two novel Zn(II) coordination polymers (CPs), [Zn(nba)2(tmdp)]n (1) and [Zn(biphen)2(tmdp)]n (2), were synthesised by reacting Zn(NO3)2·6H2O and 4,4′-trimethylenedipyridine (tmdp) with corresponding carboxylates: 4-nitrobenzoic (Hnba) and 4-biphenylcarboxylic acid (Hbiphen). Their structures were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. Compounds 1 and 2 are one-dimensional CPs with the zinc(II) carboxylate units bridged through the N-donor spacer ligand. The zinc (II) atom adopts a tetrahedral arrangement in 1 and 2 coordinated by two nitrogen atoms from two tmdp ligand molecules and two deprotonated oxygen atoms from two carboxylate ligand molecules. The adsorption capacities of MO in this study was found to be 546.31 mg/g and 22.67 mg/g for 1 and 2, respectively. DFT studies confirmed that adsorption is primarily due to π-π stacking and electrostatic interactions between MO and 1. It is noteworthy that binding energy (BE) values for 1 (-74.14 KJ/mol) and 2 (-61.11 KJ/mol) correlate reasonably well with the observed adsorption capacities of MO. The study demonstrated that 1 has higher adsorption efficiency in comparison to 2 and could be an effective and easily reusable adsorbent for the removal of MO from wastewater.

Thermodynamic Study of Adsorption of Methyl Orange and Congo Red from Aqueous Solutions by PVP-Functionalized ZnO

This study has focused on the applications of newly prepared zinc oxide (ZnO) composite with polyvinylpyrrolidone (PVP) for adsorptive removal of methyl orange and Congo red dyes. The performance of ZnO–PVP composite in removing the dyes from aqueous solution is almost double than the simple metal oxide, which signifies the role of PVP in the composite of metal oxide–PVP. The adsorption of methyl orange and Congo red onto ZnO–PVP composite was also conducted as a function of pH of solution, concentration, adsorbent dosage and temperature of the solution. The adsorption of methyl orange and Congo red onto ZnO–PVP composite decreased with the increase in pH of the mixture. The obtained adsorption capacity for methyl orange is higher than Congo red which is related to functional group and size of the dye. The values of ∆H and ∆G designate that adsorption of methyl orange and Congo red is endothermic in nature. The positive values of ∆S for methyl orange and Congo red confirmed a high disorder at the solid/liquid interface.

Synthesis of Chitosan-Silica Nanocomposite for Removal of Methyl Orange from Water: Composite Characterization and Adsorption Performance

Commercial chitosan (CH) was compositing with nanosilica prepared by the sol-gel method and was applied as an adsorbent for removal of Methyl-Orange (MO) dye from wastewater. Chitosan-Silica (CHS) was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM), fourier transforms infrared spectroscopy (FTIR) and BET. The adsorption capacity of MO on CHS reached maximum 7.0mg.g−1 on pH range 2.5 to 5, at equilibrium time 20 min. The effects of parameters, such as contact time, the adsorbent dosage of adsorbent, initial dye concentration on the removal of MO dye were examined. In general, the short time of MO dye removal, high adsorption capacity high, and dispensability in water, easy to remove by filtration suggests that CHS possesses high potential application for removal of MO from water, and can be considered as an eco-friendly adsorbent in water treatment processes.

Adsorptive removal of methyl orange from aqueous solutions by polyvinylidene fluoride triflouroethylene/carbon nanotube/kaolin nanocomposite: kinetics, isotherm, and thermodynamics

Adsorptive removal of methyl orange from aqueous solutions by polyvinylidene fluoride triflouroethylene/carbon nanotube/kaolin nanocomposite: kinetics, isotherm, and thermodynamics

Adsorptive removal of methyl orange and acid blue-2445 from binary system by anion exchange membrane BI: non-linear and linear form of isotherms

Adsorptive removal of methyl orange and acid blue-2445 from binary system by anion exchange membrane BI: non-linear and linear form of isotherms

Adsorptive removal of methyl orange from aqueous solutions with natural Garmak clay as cheap and efficient adsorbent in batch and continuous systems

The natural clay of North Garmak-Sulaimani was characterized with XRF, XRD and FTIR. The specific surface area (18.8 m2 g-1) was determined with N2 gas adsorption analyzer using multi-point BET isotherm and 0.054 cc g-1 total pore volume. The cation exchange capacity was estimated as 12.4 mmol/100 g of the natural clay by the method of Cu-triene complex. The efficiency of the natural clay was evaluated for the adsorption of a model anionic dye (methyl orange) in batch system. Non-linear curve fitting was used to examine the kinetic and equilibrium experimental data for appropriate model. Langmuir, Freundlich and Temkin isotherms were fitted well to the experimental data. The best fit was with Langmuir model with a monolayer adsorption capacity of 63.9 mg g-1 at 30 oC. The kinetic data were best fit with pseudo second-order model. The thermodynamic parameters confirmed a spontaneous endothermic adsorption process. To bring the study to industrial scale, clay granules was made from the natural clay powder and used as fixed bed adsorbent in a column for continuous system. The operational conditions were optimized. Thomas kinetic model was found to fit the experimental kinetic data.

Adsorptive removal of methyl orange with polyaniline nanofibers: an unconventional adsorbent for water treatment

ABSTRACT The present study reports the adsorptive removal of methyl orange (MO) from its aqueous solution by the utilization of polyaniline (PANI) nanofibers. PANI nanofibers were synthesized by the conventional interfacial polymerization method using ammonium persulphate as an oxidant in an acidic medium. The average diameter of the synthesized PANI nanofibers was found to be 60 ± 5 nm as detected by high resolution transmission electron microscope and scanning electron microscope techniques. The synthesized PANI nanofibers were characterized by fourier transform infrared spectroscopy, X-ray diffraction, UV–VIS spectroscopy, Brunauer-Emmett-Teller surface area analyzer (BET), zero energy thermonuclear apparatus and four-probe conductivity techniques and were further used for the adsorption of the MO dye from its aqueous solution using batch mode experiments. Due to their positively charged backbone, PANI nanofibers are found to be suitable for the adsorption of anionic dyes such as MO. The BET surface area of the synthesized polyaniline nanofibers was found to be 48.83 m2 g−1 (higher than conventionally synthesized polyaniline). The influence of important adsorption parameters, i.e. initial dye concentration, pH and duration of contact was also studied, and the equilibrium values of these parameters are noted to be 7 mg L−1, pH ∼7 and 80 min, respectively. The experimental data were found to be best fitted to the pseudo-second order model (R 2 = 0.99). The Freundlich isotherm was found to be best fitted for the adsorption of MO onto PANI nanofibers with R 2 = 0.91.

Synthesis and crystal structure of Cd-based metal-organic framework for removal of methyl-orange from aqueous solution

A novel [Cd(INA)2(H2O)]. ISB (1) (INA = isonicotinate; ISB = isobutanol) was synthesized through the reaction between the isonicotinic acid ligand and cadmium (II) salt and characterized by elemental analysis, FTIR and UV–Visible spectroscopies, SEM and Single crystal X-ray diffraction. The crystal is orthorhombic, space group Pbca, a = 12.24(10)Å, b = 15.4646(13)Å, c = 18.8445(17)Å, V = 3569(3)Å3, Z = 8. The pentagonal bipyramid (seven coordinate) around the cadmium (II) ion is of the form CdN2O5 coordinating to four oxygen atoms from carboxylates, one oxygen atom from water molecule and two nitrogen atoms of pyridine. The structure of compound is stabilized by two hydrogen bonds namely intermolecular (O-H--O) and intramolecular type C-H--O accounting for polymeric nature of the metal-organic frameworks. 1 was studied for adsorptive removal of methyl orange (MO) from aqueous solution. Equilibrium isotherm study reveals that Langmuir model gave a better fitting result than the Freundlich model. The pseudo-second order model could be used to interpret adsorption kinetics. The maximum adsorption capacity calculated by Langmuir was 166mg/g at 300K. These results indicate the adsorption of MO on 1 is partly due to electrostatic interaction between methyl orange and the adsorbent. 1 could be used as adsorbent to remove methyl orange from aqueous solution.

A Multifunctional Mn(II) Phosphonate for Rapid Separation of Methyl Orange and Electron-Transfer Photochromism.

A Mn(II) phosphonate of the general formula [Mn(H2 L)2 (H2 O)2 (H2 bibp)] adopts a layered motif with protonated H2 bibp(2+) cations embedded in the channels (H4 L=thiophene-2-phosphonic acid; bibp=4,4'-bis(1-imidazolyl)biphenyl). The title compound exhibits excellent adsorptive removal of methyl orange (MO) dye from aqueous solution. Its advantageous features include fast adsorption, high uptake capacity, selective removal, and reusability, which are of great significance for practical application in wastewater treatment. Meanwhile, the compound displays rapid photochromism upon irradiation with visible light at room temperature. Extensive research has demonstrated that such behavior is based on a ligand-to-ligand charge-transfer (LLCT) mechanism. The irradiated sample possesses an ultra-long-lived charge-separated state. Moreover, not only is the compound the first Mn-based photochromic MOF, but it is also one of the very few examples showing LLCT with non-photochromic components.

Adsorptive removal of methyl orange using enhanced cross-linked chitosan/bentonite composite

In this study, the cross-linked chitosan/bentonite composite was treated further with concentrated HCl. The resultant composite was referred to as the enhanced cross-linked chitosan/bentonite (ECCS/BT) composite, which was characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy techniques. ECCS/BT composite was used as an adsorbent to remove an anionic dye, methyl orange (MO), from aqueous solutions by a batch method. Various conditions were evaluated, including acid treatment, the ratio of chitosan to bentonite, initial MO concentration, adsorbent dosage, solution pH, and contact time. The adsorption kinetics and equilibrium isotherms of MO by the ECCS/BT composite were studied using the pseudo-first-order and pseudo-second-order kinetic models as well as Freundlich and Langmuir isotherm models. The kinetic data followed the pseudo-second-order equation; the isotherm data were described by the Langmuir isotherm model and the maximum adsorption capacity (Qmax) was obtained at 136.8 mg/g at natural pH and 293 K.