Adsorption of Methyl Orange Dye Using Fe-Mn Composite Powder as Adsorbent (original) (raw)
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International Journal of Environmental Science and Technology, 2020
Manganese oxide-poly vinyl chloride (MnO 2-PVC) composite has been synthesized for the removal of methylene blue from aqueous solution. Manganese oxide (MnO 2) was first prepared by mixing manganese chloride tetra hydrated with tetramethylammonium hydroxide and hydrogen peroxide followed by functionalization with polyvinyl chloride (PVC). The successful synthesis of the composite was confirmed by Fourier transform infrared, X-ray diffraction and energy-dispersive X-ray analysis. The point of zero charge and the surface area of MnO 2 nanosheets were increased from 4.10 and 214 m 2 /g to 5.01 and 226 m 2 g, respectively, after functionalization with PVC. The adsorption experiments under different experimental conditions, such as pH, concentration, time, dosage and temperature, were conducted to study the removal of methylene blue (MB) from aqueous solution by MnO 2 and MnO 2-PVC composite. The adsorption capacity of MnO 2-PVC was 16 times greater than pristine MnO 2 , which is attributed to its high surface area, stability, polarizability and porosity. The Langmuir isotherm model was a good choice to probe into the mechanism of adsorption. Moreover, the adsorption process followed the pseudo-second-order kinetics, and the intra-particle diffusion was accompanied by the film diffusion for controlling the rate of adsorption. The thermodynamic parameters such as free energy, enthalpy and entropy indicated that the adsorption process was found to be exothermic and more spontaneous at 298 K. These results demonstrate that MnO 2-PVC is an efficient, environment-friendly and versatile adsorbent for dyes removal from wastewater.
Study of adsorption of anionic dyes over biofabricated crystalline α-MnO2 nanoparticles
Environmental Science and Pollution Research, 2020
The leaf extract of Ficus retusa plant was used for fabrication of α-MnO 2 nanoparticles (NPs). The extract was utilized as a reducing agent for green synthesis of nanomaterial. The synthesis of nanocrystals was confirmed using different analytical techniques such as field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectroscopy, Xray diffraction (XRD) spectroscopy and thermogravimetric analysis (TGA). The synthesis of NPs was studied over a wide range of temperatures from 80 to 800°C. It was found that perfectly crystalline α-MnO 2 NPs were successfully synthesized at 800°C. The synthesized NPs were applied as an adsorbent for adsorption of azo dyes such as methyl red (MR) and methyl orange (MO) which are released as wastes from industries into water bodies and pollute the water. The removal efficiency was analysed and optimized depending on various parameters like pH, concentration of NPs, and contact time. The experimental data was explained by three isotherm models, viz. Langmuir, Freundlich and Temkin isotherms. Kinetic and thermodynamic studies of adsorption were also carried out, which depicted that the adsorption process of both dyes was exothermic in nature and followed pseudo-second-order kinetics. The results confirmed that NPs are easily fabricated through a green route and prove to be an excellent adsorbent for the removal of MO and MR dyes from their aqueous solutions. The maximum adsorption capacity of NPs synthesized was found to be 116.1 mg g −1 and 74.02 mg g −1 for MO and MR dyes, respectively. Keywords Manganese oxide. Ficus retusa. Methyl orange. Methyl red. Adsorption Highlights • Green synthesis of pure phase, crystalline, spherical α-MnO 2 NPs using Ficus retusa leaf extract. • Removal of methyl orange and methyl red dyes present in wastewater. • Characterization of NPs using FESEM, EDX, XRD and TGA. • The adsorption process was explained by different isotherm models and the kinetics and thermodynamics of adsorption were also studied. • The maximum adsorption capacity of NPs for methyl orange and methyl red dyes was found to be 116.1 mg g −1 and 74.02 mg g −1 , respectively. • High recycling efficiency of the nanomaterial as an adsorbent for removal of dyes.
APCBEE Procedia, 2012
Magnetic nanoparticles (Fe 3 O 4 ) were prepared by chemical precipitation of Fe 2+ and Fe 3+ salt from aqueous solution by ammonia solution. The aim of this present study was to investigate the feasibility of using activated maize cob coated with magnetic nanoparticles, ferric oxide (Fe 3 O 4 ) for methylene blue (MB) adsorption. The adsorption of MB on activated maize cob coated with ferric oxide (Fe 3 O 4 -MCP) was studied as a function of solution pH (3-8), adsorbent dosage (0.2-1.0g), initial concentration (100-250mg/L) and contact time. Batch process was used to determine the influence of these parameters on the adsorption capacity. The study showed that the adsorption of MB dye was pH dependent and the higher efficiency of dye concentration removal was at pH 6.0. The kinetic experimental data fitted to the pseudo-first-order and pseudo-second-order models and were found to follow closely the pseudo-second-order kinetic model. The results revealed that coating Fe 3 O 4 on activated maize cob powder enhance the dye concentration removal in the adsorption process.
Removal of methyl violet 2B dye from aqueous solution using a magnetic composite as an adsorbent
Journal of Water Process Engineering, 2015
Despite the important role of the textile industry in the global economy, its effluents generate deep concern with regard to treatment and disposal. Adsorption is a promising technique for the removal of textile color effluent at relatively low cost and with satisfactory efficiency. This study aimed to evaluate the adsorption capacity of a halloysite-magnetite-based composite in the removal of methyl violet 2B cationic dye. After preparation, the obtained composite was characterized by applying several instrumental techniques, including X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and determination of pH at the point of zero charge. The influences of stirring rate, adsorbent mass, pH, initial concentration of dye and contact time on the adsorption process were also studied. The adsorption capacity of the composite was then investigated in a temperature-controlled batch system. The experimental results showed that the adsorption kinetics were better described using a pseudo-second-order model. Regarding the adsorption equilibrium, the experimental results suggest that both the Langmuir and Freundlich models were applicable. The thermodynamic data showed that dye adsorption onto the composite was spontaneous and endothermic and occurred by physisorption. The employed composite could also be regenerated at least four times using a 1.0 mol L −1 solution of NaOH as an eluent and was shown to be a promising adsorbent for the removal of cationic dyes.
Applied Organometallic Chemistry, 2017
Mn-Zr metal oxide nanocomposite was synthesized and investigated for removal of methyl orange (MO) and eosin yellow (EY) dyes from binary dye solution. The magnetic nanocomposite has shown surface area of 143.01 m 2 /g and saturation magnetization of 15.29 emu/g. Optimization was carried out via response surface methodology (RSM) for optimizing process variables, and optimum dye removal of 99.26% and 99.55% were obtained for MO and EY dye, respectively with contact time 62 min, adsorbent dose 0.45 g/l, initial MO concentration 11.0 mg/l, and initial EY concentration 25.0 mg/l. A feed forward back propagation neural network model has shown better prediction ability than RSM model for predicting MO and EY dye removal (%). Adsorption process strictly follows Langmuir isotherm model, and enhanced adsorption capacities of 196.07 and 175.43 mg/g were observed for MO and EY dye, respectively due to synergistic effects of physicochemical properties of trimetal oxides. Surface adsorption and pore diffusions are the mechanisms involved in the adsorption as revealed from kinetic studies.
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.
Materials, 2020
The presence of synthetic dyes in water causes serious environmental issues owing to the low water quality, toxicity to environment and human carcinogenic effects. Adsorption has emerged as simple and environmental benign processes for wastewater treatment. This work reports the use of porous Fe-based composites as adsorbents for Acid Red 66 dye removal in an aqueous solution. The porous FeC and Fe/FeC solids were prepared by hydrothermal methods using iron sulfates and sucrose as precursors. The physicochemical properties of the solids were evaluated through X-ray diffraction (XRD), Scanning electron microscopy coupled with Energy dispersive spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared s (FTIR), Raman and Mössbauer spectroscopies, nitrogen adsorption–desorption isotherms, Electron Paramagnetic Resonance (EPR) and magnetic saturation techniques. Results indicated that the Fe species holds magnetic properties and formed well dispersed Fe3...
Topics in Catalysis, 2023
Nano zero-valent iron (nZVI), bimetallic Nano zero-valent iron-copper (Fe 0-Cu), and fava bean activated carbon-supported with bimetallic Nano zero-valent iron-copper (AC-F e 0-Cu) were prepared and characterized by DLS, FT-IR, XRD, and SEM. The influence of the synthesized adsorbents on the adsorption and removal of soluble anionic methyl orange (M.O) dye was investigated using UV-V spectroscopy. The influence of numerous operational parameters was studied at varied pH (3-9), time intervals (15-180 min), and dye concentrations (25-1000 ppm) to establish the best removal conditions. The maximum removal efficiency of M.O. using the prepared adsorbent materials reached about 99%. The removal efficiency is modeled using response surface methodology (RSM). The Bimetallic Fe 0-Cu, the best experimental and predicted removal efficiency is 96.8% RE. For the H2SO4 chemical AC-Fe 0-Cu, the best experimental and removal efficiency is 96.25% RE. The commercial AC-Fe0-Cu, the best experimental and predicted removal efficiency is 94.93%RE. This study aims to produce low-cost adsorbents such as Bimetallic Fe0-Cu, and Fava Bean Activated Carbon-Supported Bimetallic AC-Fe0-Cu to treat the industrial wastewater from the anionic methyl orange (M.O) dye and illustrate its ability to compete H2SO4 chemical AC-Fe0-Cu, and commercial AC-Fe0-Cu. Keywords Adsorption • Response surface methodology (RSM) • Artificial neural network (ANN) • Moth search algorithm (MSA) Abbreviations nZVI Nano zero-valent iron mZVI Modified microscale zero-valent iron M.
Magnetic nanopowder as effective adsorbent for the removal of Congo Red from aqueous solution
Water Science & Technology, 2014
A magnetic iron oxide nanopowder (MnP), prepared by a simple and efficient combustion synthesis technique, was tested for the removal of the anionic dye Congo Red (CR) from aqueous solution. The influence of solution pH, adsorbent dose, temperature, contact time and initial dye concentration on the adsorption of CR onto MnP were investigated. It was shown that the CR adsorption was pH dependent and the adsorption mechanism was governed by electrostatic forces. The adsorption kinetic was best described by the pseudo-second-order model and the equilibrium data were well fitted to the Langmuir isotherm, yielding maximum adsorption capacity of 54.46 mg g−1. The undeniable advantages of the MnP adsorbent such as inexpensive preparation method, good adsorption capacity and easy separation using an external magnetic field, recommend it as a promising candidate for the removal of anionic dyes from polluted water.
Basic Dye Adsorption onto Clay/MnFe2O4 Composite: A Mechanistic Study
Water Environment Research, 2017
Native, HCl pretreated clay and MnFe 2 O 4 /clay composite were investigated as an adsorbent for crystal violet (CV) removal. The adsorption behavior of dye was studied in batch experiments as a function of contact time, adsorbent dose, pH, dye initial concentration and temperature. The medium pH 8, contact time 30 min, MnFe 2 O 4 /clay composite dose 0.05 mg/ L, temperature 35 8C and 100 mg/L dye initial concentration furnished maximum CV adsorption. Adsorption data fitted well to the Langmuir isotherm model and maximum CV dye adsorption capacity of composite was 49.74 mg/g. The thermodynamic parameters revealed that the adsorption process of CV was exothermic and spontaneous in nature. CV adsorption followed the pseudo second order kinetic model. MnFe 2 O 4 /clay composite exhibited good CV adsorption capacity and can be used as an alternative adsorbent for the removal of basic dyes from effluents. Water Environ. Res., 89, 301 (2017).