Removal of Methylene blue in Aqueous Solution Using Modified Fe3O4 Magnetic Nanoparticles by Guanidine (original) (raw)
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Iranian Journal of Energy and Environment, 2018
In this study, the adsorption properties of spinel ferrite-based adsorbent, CoFe1.9Mo0.1O4 (CFMo), for the removal of methylene blue (MB) from aqueous solution were investigated. Sol-gel process was successfully employed to prepare CoFe1.9Mo0.1O4 magnetic nanoparticles. The synthesized adsorbent was characterized by Fourier transform infrared (FTIR), scanning electron microscope (SEM) and X-ray diffraction (XRD). The adsorption experiments were carried out at various operational conditions (solution pH, initial dye concentration, contact time, adsorbent dosage and temperature) to evaluate the potential adsorption property of CFMo magnetic nanoparticles. The results showed that, under the optimum adsorption parameters, approximately 95 % of MB dye can be removed. The adsorption data were described by Langmuir isotherm model and the maximum amount of MB adsorbed was about 20.45 mg/g. Several adsorption kinetic models and thermodynamic parameters (G , H , S ) were used to fit the adsorption experimental data. The adsorption kinetics followed the pseudo-second-order model (PSO), while the thermodynamic parameters indicate that the proposed adsorption process was endothermic and spontaneous in nature. The obtained results suggest that CFMo is promising adsorbent material for the removal of very toxic dyes from aqueous solutions.
Environmental progress & sustainable energy, 2015
Sodium dodecyl sulfate-coated magnetic nanoparticles were utilized as the inexpensive and effective adsorbents to remove neutral red and methylene blue (two cationic dyes) from aqueous solutions. Factors affecting adsorption, including the amounts of adsorbent and surfactant, pH, and contact time, were investigated by an orthogonal central composite design. The kinetic processes of the dyes adsorption were described by applying the pseudo-first-order and the pseudo-second-order models. It was found that the pseudosecond-order kinetic equation described the data of dye adsorption with a good correlation (R 2 > 0.999) which indicated a chemisorptions mechanism. The extent of dye removal enhanced with increasing initial dye concentration. The adsorption of dyes at concentrations of 30-70 mg/L reached to equilibrium within 35 min. The adsorption data were represented by Langmuir isotherm model. In addition, the maximum monolayer capacities, (q max), of methylene blue and neutral red onto the modified nanoparticles were found to be as high as 294.12 and 416.67 (mg/g), respectively. These values are higher than the adsorption capacities of some other adsorbents that have recently been published in the literature. In addition, the required contact time to achieve equilibrium was reduced by the modified nanoparticles. V
Fast Removal of Methylene Blue from Aqueous Solution Using Magnetic-Modified Fe3O4 Nanoparticles
Journal of Environmental Engineering, 2015
Coal-based activated carbons (CACs) were prepared from three long flame coals with different ash and volatile matter content. CACs prepared by coal with high ash (6.74%) and volatile matter content (34.31%) showed better adsorption efficiency towards MB (547.35 mg g À1) due to higher surface area and pore volume. The effect of coal to activating agent ratio (CAR) was also investigated in a batch reactor. The porosity development is closely related to the CAR. The calculated monolayer adsorption amount (714.29 mg g À1) was found on YLC-AC-3 with a surface area of 1212.50 m 2 g À1. The equilibrium data were favorably described by the Langmuir and Freundlich isotherm models, and adsorption kinetics fitted well to the pseudo-second order model. The removal efficiency remains at 98.21% after five runs. The results of the present study suggest that CACs are potential and effective adsorbents in fast removal of dyes from aqueous solution.
Cyanide is one of the major Environmental pollutants in industrial wastewater. Entrance of it to existence environmental contains very health hazardous. The cyanide can be removed from aqueous solutions in many ways, but most of these methods are expensive. In the present study, novel magnetic nanoparticle modified with a polydentate ligand is used to remove cyanide. The procedure is efficient and cost-effective. In this study, novel magnetic nanoparticle (Fe 3O4-SiO 2 –Met) is used to remove cyanide. Various parameters affecting the removal rate such as pH (9-11), the amount of absorbent (0.01, 0.03, 0.05gr) and contact time (4-12 hr) were evaluated. Data from the experiment were analyzed with a mathematical model of the smallest sum of squares. The relationship between time and pH value on the removal of cyanide are linear. Nevertheless, the amount of the adsorbent and time are effective. Absorbent weight is increased from 0.01 to 0.05 g and removal efficiency reaches from 20% to 60%. With increasing contact time from 4 to 12 hours removal efficiency reaches from 30% to 55% . The finding of this research is introducing modified nanoparticles Fe 3O4-SiO 2 –Met as an adsorbent for removing cyanide.
Journal of the Chinese Chemical Society, 2011
A magnetic adsorbent was synthesized by modification of activated carbons with magnetic iron oxide nanoparticles (AC-MIONs). The preparation method is fast and could be carried out in an ordinary condition. The AC-MIONs were used as quite efficient adsorbents for separation of methylene blue (MB) from aqueous solution in a batch process. The effect of different parameters such as pH, temperature, electrolyte concentration, contact time and interfering ions on the removal of MB were studied. The adsorption data were analyzed by Langmuir and Freundlich isotherm models and a maximum adsorption amount of 47.62 mg g-1 and a langmuir adsorption equilibrium constant of 3.0 L mg-1 were obtained. The obtained results revealed that AC-MIONs were effective adsorbents for fast removal of MB from different aqueous solutions. This adsorbent was successfully used for removal of MB from Karoon River water.
Gum Arabic-Coated Magnetic Nanoparticles For Methylene Blue Removal
International Journal of Innovative Research in Science, Engineering and Technology, 2014
Magnetic nanoparticles (MNPs) were fabricated using the chemical co-precipitation method followed by coating the surface of magnetic Fe 3 O 4 nanoparticles with gum arabic (GA). The fabricated magnetic nanoparticles were characterised using transmission electron microscopy (TEM) which showed that the Fe 3 O 4 nanoparticles and GA-MNPs nanoparticles had a mean diameter of 33 nm, and 38 nm, respectively. Scanning electron microscopy (SEM) images showed that the MNPs modified with GA had homogeneous structure and agglomerated. The energy dispersive X-ray spectroscopy (EDAX) spectrum showed strong peaks of Fe and O. X-ray diffraction patterns (XRD) indicated that the naked magnetic nanoparticles were pure Fe 3 O 4 with a spinel structure and the covering of GA did not result in a phase change. The covering of GA on the magnetic nanoparticles was also studied by BET analysis, and Fourier transform infrared spectroscopy.Moreover, the present study reports a fast and simple method for removal and recovery of methylene blue dye (MB) from aqueous solutions by using the synthesised magnetic nanoparticles modified with gum arabic as adsorbent. The experimental results show that the adsorption process attains equilibrium within five minutes. The data fit the Langmuir isotherm equation and the maximum adsorption capacities were 8.77 mg mg-1 and 14.3 mg mg-1 for MNPs and GA-MNPs, respectively. The results indicated that the homemade magnetic nanoparticles were quite efficient for removing MB and will be a promising adsorbent for the removal of harmful dyes from wastewater.
Arabian Journal of Chemistry, 2011
In this research, the potential of Fe 3 O 4 magnetic nanoparticles (MNPs) for efficient removal of methyl violet as a cationic dye from aqueous solutions was investigated. For this purpose, Fe 3 O 4 MNPs were synthesized via chemical precipitation method. The synthesized MNPs were characterized by XRD and SEM techniques. To remove methyl violet, the surface of the MNPs was modified with sodium dodecyl sulfate (SDS) as an anionic surfactant. Also, the various parameters affecting dye removal were investigated and optimized. The kinetic studies for methyl violet adsorption showed rapid sorption dynamics by a second-order kinetic model, suggesting chemisorption mechanism. Dye adsorption equilibrium data were fitted well to the Langmuir isotherm rather than Freundlich isotherm. The maximum monolayer capacity, (q max), was calculated from the Langmuir as 416.7 mg g À1. The results show that, SDS-coated magnetic nanoparticles, can be used as a cheap and efficient adsorbent for removal of cationic dyes from aqueous solutions.
Journal of the Mexican chemical society, 2019
This study was focused on the adsorption of methylene blue (MB) as a cationic dye on magnetite nanoparticles loaded with coffee (MNLC) and magnetite nanoparticles loaded with peanut husk (MNLPH) as naturally cheap sources of adsorbent. Coffee and Peanut husk were magnetically modified by contact with water-based magnetic fluid. These new type of magnetically natural materials can be easily separated by means of magnetic separators. They were characterized with Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) instruments. Different parameters affecting MB removal efficiency such as contact time, pH of solution and amount of adsorbents were studied and optimized. Dye adsorption process was studied from both kinetic and equilibrium point. The studies of MB sorption kinetic showed rapid dynamic sorption with second-order kinetic model, suggesting chemisorption mechanism with R 2 = 0.9988, qeq=10.28 mg g-1 and R 2 =0.9967, qeq=128.20 mg g-1 , respectively. Equilibrium data were fitted well to the Langmuir isotherm more than Freundlich and Temkin isotherm. The modified adsorbents showed MB removal with 88.49 and 74.62 mg g-1 sorption capacity for MNLC and MNLPH, respectively. This study showed a simple, efficient and reliable method for removal of MB from aqueous solutions with MNLC and MNLPH as efficient adsorbents.
RSC Advances, 2019
This study was aimed at developing green histidine-modified Fe 3 O 4 nanoparticles (His-MNPs) for the adsorptive removal of Acid Black 1 (AB1) from aqueous solution. The His-MNPs were characterized by atomic force microscopy, scanning electron microscopy-energy dispersive X-ray spectrometry, infra-red spectra and thermogravimetry. These MNPs were spherical (average diameter 11-28 nm) with polydispersity index of 1.40 and about 13% mass coating of histidine. To optimize AB1 adsorption on His-MNPs and understand its mechanism, the influences of different operational variables (pH, adsorbent amount, temperature, initial AB1 concentration, contact time, ionic strength, etc.) on adsorption were examined with adsorption isotherms, kinetics and thermodynamic studies. The AB1 adsorption from water was fast with equilibrium time # 45 min. The adsorption equilibrium was best fitted to the Langmuir isotherm model (q max ¼ 166.7 mg g À1 at the adsorbent dose of 0.2 g L À1 , temperature 30 C and pH 4). The linearity order for other isotherms was as follows: Dubinin-Radushkevich (D-R) < Temkin < Freundlich. The kinetics of the AB1 adsorption demonstrated the best compliance with the pseudosecond-order model, predominantly controlled by film diffusion as compared to intraparticle diffusion. Thermodynamic parameters (DH and DG) reflected the exothermic and spontaneous adsorption process. The values of DG , DH , activation energy and D-R free adsorption energy were all consistent with the physisorptive removal of AB1. The spectral (electronic and IR) and pH studies further corroborated the mechanism of AB1 removal by His-MNPs. The His-MNPs showed efficient adsorption, easy regeneration and excellent reusability, assisted by their pH-responsive properties. The prepared adsorbent can provide a safe, effective and economical alternative strategy for removing azo dyes from wastewater.
Quarterly Journal of Applied Chemical Research, 2016
The prepared magnetic-modified Fe3 O4 nanoparticles (Fe3 O4 -TAN) were used as adsorbent for removal of crystal violet (CV) from water solution. The effects of pH, contact time, dye concentration and temperature on adsorption were determined. The experimental data were analyzed using the Langmuir adsorption model. The data fitted well to the model with maximum adsorption capacities 84.0 mg/gunder pH=11.0. Also the adsorption kinetics and thermodynamic parameters were studied and evaluated. Adsorption of the CV to nanoparticles reached equilibrium after 15 min. In addition, the external magnetic field could easily separate nanoparticles from water with high separation efficiency.