Adsorption Of Methyl Orange Dye Research Articles

Removal of Anionic Methyl Orange Dye from Water by Poly[2-methyl-1H-indole] Derivatives: Investigation of Kinetics and Isotherms of Adsorption.

The adsorption properties toward methyl orange (MO) were evaluated for poly[2-methyl-1H-indole] and its derivatives. The influence of pH, ionic strength of solution, composition, and amount of sorbent on the adsorption of MO dye was investigated; the kinetics of dye adsorption was studied. The adsorption isotherms were analyzed using different models of sorption equilibrium. The presence of chemical interaction between polyindoles and dye was proved by IR and UV spectroscopy methods. The sorption of MO with polymers is realized mainly due to the formation of electrostatic interactions between the sulfogroup of the dye and the imino group of the sorbent. Microphotographs demonstrate the change in the morphology of polyindoles after adsorption, which further confirms the structural changes in the polymers. It was found that the main factors affecting the sorption capacity of the studied materials are the position and nature of substituents in the polymers and the sorption conditions. For example, polyindoles containing a methoxy group in their structure (o-OMePIn and m-OMePIn) have the best sorption activity. These polymers are effective in adsorbing dyes, which means that they can be used in wastewater treatment.

Synthesis of geopolymer powder and beads based on red clay waste for the adsorption of methyl orange dye from aqueous solutions: Characterization, application of response surface methodology, and cost analysis

The current research focuses on the valorization of red clay waste (RCW) to develop alumino-silicate geopolymer binders (GPP) and geopolymer spheres obtained from GPP powder modified with sodium alginate (Alg/GPP). GPP and Alg/GPP were applied in the environmental field for the retention of methyl orange (MO) from an aqueous solution. The raw material and the synthesized geopolymers were characterized by various physico-chemical methods. The results of XRF, XRD, and FTIR confirmed the successful synthesis of GPP and Alg/GPP, while the SEM/EDX findings revealed the homogeneous surface of the adsorbents. A significant specific surface area was detected for GPP (73.56 m2/g) and Alg/GPP (91.24 m2/g) with a high cation exchange capacity around 122 meq/100g for GPP and 185 meq/100g for Alg/GPP. The removal process was performed using the response surface methodology according to the Box-Behnken design, optimizing the retention efficiency of MO by different factors, including temperature, initial concentration, solution pH, and contact time. The obtained data was treated through the analysis of variance (ANOVA) and fitted by a quadratic polynomial model based on multiple regression analysis. In an acidic medium at 45 °C, the optimal conditions for MO retention were estimated to be 120 mg/L of MO concentration in 55 min using GPP and 180 mg/L of MO concentration in 20 min using Alg/GPP. The pseudo-second-order kinetics were more appropriate for describing the MO removal onto GPP and Alg/GPP adsorbents. The Langmuir model identified a high retention capacity of MO around 94.78 mg/g via GPP and 224.85 mg/g via Alg/GPP. The thermodynamic data confirmed that the elimination of MO dye onto GPP and Alg/GPP adsorbents was endothermic, favorable, and spontaneous. This study provided insights into the valorization of composite materials based on solid waste in dye retention, which can potentially be employed in wastewater treatment.

Investigation of Polypyrrole and Polypyrrolepolyethyleneimine as Adsorbents for Methyl Orange Dye Adsorption

The present study has explored the adsorption properties of polypyrrole-based adsorbents (polypyrrole and polypyrrole-polyethyleneimine composite) as novel conducting polymers in adsorbing methyl orange (MO) (an anionic dye) effectively from aqueous solution. The adsorption characteristics of the prepared polymer-based adsorbents were characterized by BET, FTIR, FESEM, and XRD methods. The effectiveness of PPy-based adsorbents for MO dye adsorption was examined using the batch adsorption method. Different parameters were changed during the adsorption process, including contact time, solution pH, and adsorbent dosage. The highest BET surface area of the PPy-PEI composite was found to be 11.85 m2/g, which is much greater than that of the pristine PPy having 8.54 m2/g. The dye removal performance was obtained to be 79.1 % and 98.8 %, by pristine PPy adsorbent and PPy-PEI adsorbent, respectively, at the optimum condition of pH 3, adsorbent dosage of 0.1 g with a contact time of 120 minutes. The Langmuir isotherm model explained the adsorption data better than the Freundlich isotherm model, and the pseudo-second-order model adequately explained the kinetic data for both the adsorbents. The regeneration investigation demonstrated the effectiveness of reusing PPy-PEI composite adsorbents for up to three successive adsorption-desorption cycles. The prepared PPy-PEI composite adsorbents appeared to be very much effective in removing anionic dyes from aqueous solutions.

Bimetallic Organic Gel for Effective Methyl Orange Dye Adsorption.

A bimetallic organic gel (MOG-Fe/Al) was synthesized through the solvothermal method. The gel state of the product obtained under optimized gel formation conditions is sufficient to carry 2 g of weight for a long time. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) technique, and X-ray photoelectron spectroscopy (XPS) analysis confirmed the structures and morphologies of the synthesized materials. MOG-Fe/Al, with good stability, excellent durability, and wide applicability, exhibited efficient MO adsorption capacity as high as 335.88 mg/g at 25 °C. Adsorption-influencing factors including solution pH, contact time, and temperature were investigated. The adsorption performance of the bimetallic organic gel was better than that of the monometallic organic gels (MOG-Fe and MOG-Al), and its adsorption processes were in accordance with the pseudo-second-order kinetic and Langmuir isothermal models. The excellent adsorption capacity of the MOG-Fe/Al is due to its surface structure, pore volume, π-π interactions, hydrogen bonds, and electrostatic interactions.

ZnO@ activated carbon derived from wood sawdust as adsorbent for removal of methyl red and methyl orange from aqueous solutions

Activated carbon (AC) and ZnO@AC composite derived from wood sawdust were prepared to be utilized as adsorbents for methyl red (MR) and methyl orange (MO) anionic dyes from the aqueous solutions. The maximum adsorption capacity of the AC and ZnO@AC composite toward both dyes was achieved in the strong acidic medium (pH = 3), and under stirring for 60 min. The kinetic studies revealed that the adsorption of MR and MO dyes onto the AC and ZnO@AC composite fitted well with the pseudo-second-order model. Furthermore, the intraparticle diffusion and Elovich kinetic models confirmed the adsorption is controlled by external surfaces, and the adsorption is chemisorption process. The isotherm results indicated that the MR and MO dye adsorption occurred via monolayer adsorption, and the estimated maximum adsorption capacities of both dyes onto the ZnO@AC composite were higher than those achieved by AC. Thermodynamic analysis suggested that the adsorption is endothermic and spontaneous. The mechanism for MR, and MO dyes adsorption onto the AC and ZnO@AC composite is proposed to be controlled by electrostatic bonding, π–π interactions, and ion exchange, while H-bonding and n–π interactions were minor contributors. This study reveals the potential use of carbon-based adsorbents derived from wood sawdust for the removal of anionic dyes from wastewater.

Effective adsorption of methyl orange dye from water samples over copper(II) Schiff-base complex-immobilized cerium-based metal-organic framework

Herein, a copper(II) Schiff-base complex derived from the condensation of salicylaldehyde (Sal) with amino groups of a cerium-based metal-organic framework of type, UiO-66-NH2(Ce), denoted here Cu(II)/Sal@UiO-66(Ce), has been prepared and characterized by EDX, SEM, FT-IR, BET and XRD, as well as thermal gravimetric analysis (TGA) techniques. The nominal nanostructure including dual-metal sites (Ce and Cu) was considered as a novel adsorbent for removing methyl orange (MO, as an organic contaminant) dye from aqueous media. Accordingly, various key experimental factors such as the pH, mass of adsorbent, contact time, and eluent type were tested and optimized. Based on experimental outcomes, the adsorption of MO for Cu(II)/Sal@UiO-66(Ce) reaches a maximum of 98.8 % efficiency at a pH of 6 and a maximum extraction capacity of 454.5 mg/g. Also, the limit of detection (LOD) and relative standard deviation (RSD%) were 0.63 μg/L and 2.4 %, respectively, under the optimum condition. Reusability, short adsorption time, and low-cost cerium-based MOF are the other advantages of the corresponding adsorbent. In addition, the porous adsorbent was applicable for the MO adsorption from environmental water samples.

Properties and performance of Ni(II) doped magnetic Fe3O4@mesoporous SiO2/UiO-66 synthesized by an ultrasound assisted method for potential adsorbent of methyl orange: Kinetic, isotherm and thermodynamic studies

Ni(II) doped magnetic Fe3O4@mesoporous SiO2/UiO-66 composite (FSUNi(x)) was synthesized by ultrasound methods for methyl orange (MO) adsorption. Ultrasound irradiation caused the in situ growth of Ni on Fe3O4 @mesoporous SiO2/UiO-66 composite. Ni enhanced the surface area and porosity of composites due to the substitution of Zr in UiO-66 with Ni, which generates defects. The SEM and TEM analysis exhibited the Fe3O4 @mesoporous SiO2 core of ∼324 nm diameter, coated with a Ni-UiO-66 shell of ∼ 23 nm thickness. At 10% nickel doping, FSUNi(10) composites showed high surface area, large pore diameter, excellent adsorption capacity, and high magnetic properties (8.16 emu/g) that achieved rapid recovery in 20 s. The influence of contact time (1–120 min), dye concentration (25–350 mg/L), pH of the initial solution (2−13), adsorption temperature (30–50 °C), and ionic strength (0–3 g/L) on the adsorption capacity were determined to understand the kinetic and thermodynamic of adsorption. The maximum adsorption capacity increased from 200.803 to 256.410 mg/g with increasing temperature from 30° to 50°C, and adsorption reached optimum capacity at pH 4. According to isothermal and kinetic analyses, adsorption follows the Langmuir isotherm model and the pseudo second order kinetic model. Based on the Langmuir isotherm model, the maximum adsorption capacities of UiO-66 and FSUNi(10) were determined at 182.815 and 200.803 mg/g, respectively. Thermodynamic analysis revealed the spontaneous and endothermic adsorption of MO dye on FSUNi(10). FSUNi(10) showed high adsorption capacity after three regeneration cycles, which can be a potential magnetic adsorbent for wastewater treatment.

ASSESSMENT OF THE EFFICIENCY OF CRUSHED CERAMICS IN ADSORBING METHYL ORANGE DYE FROM WASTEWATER

Objective: This study investigates and assesses the potential of crushed, pulverized ceramics as a low-cost adsorbent for the removal of methyl orange from wastewater. The presence of heavy metals and dyes in water bodies are deadly to the living organisms inside water, in which these pollutants are bio-accumulated and biomagnified in the environment. Due to the health effects of these pollutants, it is, therefore, necessary to treat metal and dye-contaminated wastewater prior to its discharge into the environment in order to comply with the stringent environmental regulations and also safeguard the present and future generations. Methods: The influence of pH, contact time, initial metal concentration, adsorbent dosage and temperature were studied in batch experiments at room temperature and were measured using UV-VIS Spectrophotometer at wavelength 464 nm. Fourier Transform Infrared (FTIR) technique was employed as an instrument for characterization of the adsorbent before and after adsorption and the data were collected and interpreted using Microsoft Excel, 2016. Results: Maximum sorption for methyl orange was found to be at pH 2. The adsorption was rapid at the first 90 min of contact, with uptake of more than 90%, and equilibrium was achieved in 60 min of agitation. Langmuir, Freundlich and BET’s isotherm models were applied to describe the adsorption of methyl orange dye. Fourier Transform Infrared (FTIR) spectra of ceramics powder revealed that OH, C-H, C=C, C-O stretching were responsible for the adsorption. However, the effects of different experimental parameters that influenced the efficiencies of the adsorbent have been evaluated and optimized. Conclusion: The investigation revealed that the adsorption capacity of the powdered ceramics on the removal of methyl orange dye is high enough compared to observed values in literatures. Freundlich’s model fitted the equilibrium data better, while the pseudo-second-order kinetic model was the most fitting from the kinetic data obtained for the adsorption of methyl orange dye.

Removal Efficiency and Adsorption Kinetics of Methyl Orange from Wastewater by Commercial Activated Carbon

This research investigates commercial activated carbon (AC) potential to remove methyl orange (MO) dye removal from aqueous solution using a batch process. The AC material was characterized using FTIR spectroscopy and SEM analysis. The effect of the main operating parameters, such as the pH, adsorbent dosage, contact time, and initial dye concentration, was studied. MO removal could be accomplished within 30 min at a pH value of 3. The calculated maximum MO adsorption capacity onto activated carbon was 129.3 mg/g, while the removal efficiency was 97.8%. Adsorption results were analyzed by studying the Langmuir and Freundlich isotherm models. The MO adsorption data on activated carbon were better explained by the Langmuir isotherm than by the Freundlich isotherm. The pseudo-second-order kinetic model may have had an effect on the MO dye adsorption on AC material. This research showed that the commercial activated carbon can be used as an effective sorbent for MO removal from wastewater sample. Moreover, the AC material has good reusability and practical utilization capacities.

Adsorption of anionic methyl orange dye on hybrid spherical silica in fixed-bed column

The textile sector is recognized for contributing the most dye residue, which is one of today's environmental challenges. It is a risky technique since wastewater includes toxins that can damage water sources and endanger human health and aquatic life. As a result, wastewater must be treated before disposal. There are numerous methods for removing dyes from wastewater, which categorized into chemical treatments, physical and biological procedures.. This study chose the continuous adsorption approach, which falls under the physical method since it is simple and effective. The oil-in-water emulsion was used to synthesize spherical silica (SSi) adsorbent in order to effectively remove and remediate one of the water-soluble anionic dyes, methyl orange dye (MO). The effect of influent concentration (10 to 50 ppm) and bed height (1.0 to 2.0 cm) on the continuous process was investigated. The breakthrough time exhibited an increase as the dye concentration decreased for all solutions that were examined. The removal efficiency of MO increased as the bed height increased, which can be attributed to the longer contact time between the MO dye and the adsorbent. The Thomas model exhibited a more favorable level of conformity to the data than Adams-Bohart and Yoon-Nelson. According to Thomas ' model, the maximum adsorption capacity (qo) increased as bed height decreased, and concentration increased. Moreover, Correlation values ranged from 0.882 to 0.979. Therefore, spherical silica adsorbent has the highest methyl orange dye adsorption capability at a bed height of 2.0 cm and concentration of 50 ppm.

In Situ Synthesis of Crystalline MoS2@ZIF-67 Nanocomposite for the Efficient Removal of Methyl Orange Dye from Aqueous Media.

The zeolitic imidazolate framework-67 (ZIF-67) adsorbent and its composites are known to effectively remove organic dyes from aqueous environments. Here, we report a unique crystalline MoS2@ZIF-67 nanocomposite adsorbent for the efficient removal of methyl orange (MO) dye from an aqueous medium. In situ synthetic techniques were used to fabricate a well-crystalline MoS2@ZIF-67 nanocomposite, which was then discovered to be a superior adsorbent to its constituents. The successful synthesis of the nanocomposite was confirmed using XRD, EDX, FTIR, and SEM. The MoS2@ZIF-67 nanocomposite exhibited faster adsorption kinetics and higher dye removal efficiency compared with its constituents. The adsorption kinetic data matched well with the pseudo-second-order model, which signifies that the MO adsorption on the nanocomposite is a chemically driven process. The Langmuir model successfully illustrated the MO dye adsorption on the nanocomposite through comparing the real data with adsorption isotherm models. However, it appears that the Freundlich adsorption isotherm model was also in competition with the Langmuir model. According to the acquired thermodynamics parameters, the adsorption of MO on the MoS2@ZIF-67 nanocomposite surface was determined to be spontaneous and exothermic. The findings of this research open an avenue for using the MoS2@ZIF-67 nanocomposite to efficiently remove organic dyes from wastewater efflux.

Tulsi (Ocimum sanctum) mediated Co nanoparticles with their anti-inflammatory, anti-cancer, and methyl orange dye adsorption properties

Nanotechnology is an emerging technology that uses medicinal plants to extract nanoparticles for conventional applications. In the present investigation, the medical plant Tulsi (Ocimum sanctum) has used in the synthesis of cobalt (Co) nanoparticles in a cost-effective, feasible process. The efficiency of nanoparticles in removing methyl orange dye was evaluated by analyzing their applications in wastewater treatment. An analysis of the anti-inflammatory and anti-cancer properties of Tulsi-mediated Co nanoparticles was conducted to examine their medical application. Morphological analysis of Co nanoparticles showed that the synthesized nanoparticles were in crystal shape with a mean particle size of 110 nm. A batch adsorption study has shown that incubation periods of 5 h, pH 2, temperatures of 70 °C, and adsorbent dosage of 125 μg/mL are optimal for removing methyl orange dye from wastewater. To examine the anti-inflammatory properties of Tulsi-mediated Co nanoparticles, protein denaturation and nitric oxide scavenging assays were performed. The maximum anti-inflammatory response was recorded at a concentration of 250 μg/mL of Co nanoparticles. MTT assays against MDA-MB-231 human breast cancer cells were used to evaluate the anti-cancer properties of Co nanoparticles. This study investigates the economical extraction of Co nanoparticles from tulsi and its potential use in wastewater purification and biomedical applications.

Green Approach to Water Purification: Investigating Methyl Orange Dye Adsorption Using Chitosan/Polyethylene Glycol Composite Membrane

Green Approach to Water Purification: Investigating Methyl Orange Dye Adsorption Using Chitosan/Polyethylene Glycol Composite Membrane

Properties of hydroxyapatite from tilapia (Oreochromis niloticus) bones: An approach towards its potential use as a dye adsorbent

The properties of hydroxyapatite (HAp) obtained from tilapia (Oreochromis niloticus) bones and its potential use as a dye adsorbent using methyl orange (MO) as a model dye were evaluated. HAp was produced by the calcination of dried tilapia bones at 900 °C for 4 h. Then, HAp was characterized using thermogravimetric (TGA) and differential thermogravimetric (dTG) analyses, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), x-ray diffraction (XRD), among others. The HAp obtained was used for MO dye adsorption in a batch process. The yield of HAp was 51.6%. FTIR showed characteristic bands of functional groups of HAp [OH- and (PO4)3-]. FESEM images showed HAp with different morphologies and a porous surface. The EDS analysis indicated the presence of calcium and phosphorus with an atomic ratio of Ca/P of 1.60, TEM images revealed the formation of agglomerates and an average particle size of 655.1 nm. HAp and β-tricalcium phosphate (β-TCP) phases were identified through XRD. The HAp point of zero charge (pHpzc) was 9.7 indicating a possible adsorption of anionic dyes at pH< pHpzc and cationic dyes at pH> pHpzc. The HAp was able to successfully adsorb 82.6% of MO dye from aqueous solution. These findings demonstrated that the HAp obtained from tilapia (O. niloticus) bones possesses suitable properties to be used as a potential material to remove dyes.

Improving toxic dye removal and remediation using novel nanocomposite fibrous adsorbent

Materials with regulated nanoscale morphology provide capabilities to remove dangerous pollutants from wastewater, by adsorption. In this study, the chitosan-based composite fibrous adsorbent was fabricated and used as a novel and facile eliminator in the process of removing cationic methyl orange (MO) from the water medium. Different methods were applied to check the properties of the desired composite fibrous adsorbent. The removal value showed that the chitosan-embedded composite fibrous adsorbent has super characteristics and can be removed the organic dye from the water. The influence of pH, time, temperature, eliminator quantity, and MO content was explored. With increasing time and eliminator quantity, the adsorption efficiency increased. The composite fibrous adsorbent with the advantage of its high functionality and combined micro-nanomorphology features, has emerged as a very promising candidate for obtaining versatile and robust adsorbents. This work presents how the tunned synthesis of composite fibrous adsorbent tailored their nanoarchitecture giving rise to adsorption capacities toward cleaning aqueous samples polluted with MO dye. The composite fibrous adsorbent was prepared by the direct immobilization method, with normal aging temperature, in order to study the effect of synthesis conditions on the adsorption properties of MO dye. The solution acidity was exhibited as the key factor, and a suitable pH of 5.50 was selected based on the efficiency. The competing ions were not adversely affected in the dye adsorption as defined by the stable bonding mechanism. The adsorption data were highly fitted with the Langmuir adsorption model with monolayer coverage. The determined maximum adsorption was 175.45 mg/g, which was comparable with the other forms of materials. The adsorbed MO dye elution was evaluated using ethanol and then the composite fibrous adsorbent was ready to use for MO dye adsorption after washing with water without significant loss in its functionality. Therefore, we explored the tunned morphology of composite fibrous adsorbent for obtaining performant adsorbents for the elimination of refractory pollutants in wastewater.

Methyl orange dye adsorption and degradation at low temperature using iron oxide-incorporated biochar derived from industrial by-products

Sustainable waste management enhances national development and benefits society and the environment. Pyrolysis has the potential to contribute to this growth by converting waste into energy and other useful by-products. This study aimed to eliminate methyl orange (MO) dye from dye-contaminated water using industrial by-products to synthesize iron-oxide-incorporated biochar (Fe2O3/Fe3O4/BC). Biomass, biochar (BC), and Fe2O3/Fe3O4/BC were characterized by proximate, ultimate, elemental, XRD, and Brunauer–Emmett–Teller surface area analyses. Minitab 19 statistical analysis was used to optimize biochar output and MO dye removal. The heating rate and residence period of 5.9 °C/min and 186.7 min, respectively, were the optimal conditions for producing biochar with a maximum fixed carbon concentration of 55.48. At pH 3, 4 g/l biochar with 3 % iron oxide, and 317 K, MO dye removal was 100 %. MO dye was eliminated by bond breaking of the azo group and adsorption onto the active sites of biochar containing iron oxide.

Formation of pH-Responsive Cotton by the Adsorption of Methyl Orange Dye.

The interest in pH-sensitive textile sensors is growing in the global market. Due to their low-cost production, mechanical stability, flexibility, air-permeability, washability, and reusability, they are more suitable than electronic sensor systems. The research tailored the pH-sensitive textile by applying the pH indicator methyl orange to the cotton fabric during conventional dyeing. Adsorption of methyl orange dye to cotton fabric is hindered due to electrostatic repulsive forces between dye anions and negatively charged cotton fibre. To overcome this problem, chemical modification of cotton fabric using a commercial product was performed. The pH sensitivity of the dyed fabric was spectrophotometrically evaluated. In addition, the colour fastness of dyed cotton fabric to washing, light, hot pressing and rubbing was investigated according to valid SIST EN ISO standards. The research results show that the pH-responsive cotton fabric was successfully developed. The chemical modification of cotton fabric is crucial for the increased adsorption of methyl orange dye. The halochromic effect was not only perceived spectrophotometrically but also with the naked eye. The developed halochromic cotton fabric showed poor colour fastness to light and good colour fastness to hot pressing and rubbing, while no significant improvement in colour fastness to washing was observed, even though the fabric was after-treated with a cationic fixing agent. Higher adsorption of the methyl orange dye to the cotton fabric during the dyeing process leads to less wastewater pollution after dyeing with unfixed dye and, thus, a reduction in wastewater treatment costs.

Statistical physics double-layer models for the experimental study and theoretical modeling of methyl orange dye adsorption on AlMnTiO nanocomposite

A Al2O3/MnO2/TiO2 (AlMnTiO) nanocomposite was synthesized using the thermal coprecipitation method and the adsorption performance of methyl orange (MO) dye from aqueous solution was carried out. Single-parameter optimization was used to explore the properties of AlMnTiO nanocomposite parameters on dye adsorption, including dose of adsorbent, solution pH, contact duration, and starting MO concentration. The model is the appropriate adsorption isotherm for the equilibrium process using a pseudo-second-order kinetic model property. Langmuir plot had a Q max (mg/g) of 198.4 and best fitted (R 2=0.990) among different isotherm models. The relevant parameters were computed using the dual-energy binary-layer statistical physics model. The statistical physics binary-layer model yield n (stoichiometric coefficient) values of 0.410, 0.440, and 0.453, all values are below 1, demonstrating the multi-docking process. AlMnTiO nanocomposite was regenerated up to six times, making the material extremely cost-effective. Using AlMnTiO nanocomposite, MO dye was removed from wastewater both in the laboratory and on the industrial scale.

Adsorption of methyl orange dye by SiO2 mesoporous nanoparticles: adsorption kinetics and eco-toxicity assessment in Zea mays sprout and Artemia salina.

Herein, we prepared the silica nanoparticles (SiO2 NPs) by a modified Stober's method for methyl orange (MO) removal. The SiO2 NPs were found to be spherical with a zeta size of 152.5 d. nm, a PDI of 0.377, and a zeta potential of -5.59 mV. The effect of different parameters (initial dye concentration, reaction time, temperature, and pH) on the adsorption of MO by SiO2 NPs was determined. The adsorption pattern of SiO2 NPs was highly fitted with the Langmuir, Freundlich, Redlich-Peteroen, and Temkin isotherm models. The highest adsorption rate was recorded at 69.40 mg/g of SiO2 NPs. Furthermore, the toxic effect of before and after removal of MO in aqueoussolution was tested in terms of phytotoxicity and acute toxicity. The SiO2 NPs treated MO dye solution were not exhibited significant toxicity to corn seeds and Artemia salina. These results indicated that SiO2 NPs can be used for the adsorption of MO.

Adsorption of Methyl Orange Dye by Modified Fly Ash-Based Geopolymer – Characterization, Performance, Kinetics and Isotherm Studies

Adsorption of Methyl Orange Dye by Modified Fly Ash-Based Geopolymer – Characterization, Performance, Kinetics and Isotherm Studies