Removal of Methylene Blue from Aqueous Solutions using Nano-Magnetic Adsorbent Based on Zinc-Doped Cobalt Ferrite (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.
ACS Sustainable Chem. Eng. 2017, 5, 1280−1286, 2017
A Zn2+–silica modified CoFe2O4 (CZFS) nanostructured composite, useful for adsorbing cationic pollutants from water, was prepared by a wet-chemical method. The composite comprises cubic spinel crystallites (average 18 nm size) with amorphous silica clusters decorated on the crystallites-surface. Improved surface area (59.8 m2/g) of CZFS over those of Zn2+ modified CoFe2O4, CZF (32.6 m2/g), and CoFe2O4, CF (42.8 m2/g), together with its high negative ζ-potential of −35.4 mV (from surface SiO–) provides CZFS with improved adsorption capacity for Methylene blue (MB) over that of CZF and CF. MB adsorption (initial adsorbate concentration C0 = 5–25 mg/L) conforms to the Langmuir isotherm model, with maximum monolayer adsorption capacity Qm = 25.6 mg/g. CZFS exhibits adsorption efficiency Ae ≥ 98% for removal of heavy metal ions Cr3+, Cu2+ and Pb2+ (C0 = 5 mg/L). High Ae = 99.9% for Pb2+ dropped only to Ae = 98.8% for higher C0 = 20 mg/L (Qm = 19.8 mg/g). Saturation magnetization of 39 emu/g enables easy magnetic separation of CZFS from water. Good reusability of CZFS adsorbent was observed for up to three cycles. In summary, CZFS efficiently removes MB as well as heavy metal ions (especially Pb2+) from contaminated water.
Water Supply, 2020
Cobalt ferrite nanoparticles (CoFe2O4 NPs) are used as an efficient adsorbent to remove cobalt (II) phthalocyanine (CoPc) dye from aqueous solutions. The characterization of adsorbent is investigated by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray spectroscopy (EDX), and the vibrating sample magnetometer (VSM) technique. To optimize the effective factors, response surface methodology (RSM) through using Box–Behnken design (BBD) is applied. By proper running of the Desirability function option in MINITAB software, the optimum conditions were found as pH 3.2, adsorbent mass (m) 11 mg, contact time of nine minutes (t), and initial dye concentration (Cd) of 30 mg L−1. Isotherm studies of the adsorption process are carried out where the Langmuir isotherm shows the maximum monolayer capacity (qmax) is 431 mg g−1. The kinetic studies including pseudo-first-order, pseudo-second-order a...
AIJR Publisher in Proceedings of First Conference for Engineering Sciences and Technology (CEST-2018), September 25-27,, 2018
Water contamination by synthetic dyes is considered as a serious environmental issue, globally. In this study, the adsorptive removal of a very toxic cationic dye, methylene blue (MB), from aqueous solution was investigated using spinel ferrite, CoFe1.9Cr0.1O4 (CFC), magnetic nanoparticles as an adsorbent. CoFe1.9Cr0.1O4 powder was successfully synthesized via a sol-gel process and characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) techniques. The effect of various experimental parameters on MB removal including; contact time, initial dye concentration, adsorbent dosage, solution pH and temperature were investigated. The results revealed that about 94 % of MB was removed under the optimal operational conditions. The adsorption kinetics showed that adsorption data were better described by pseudo-second-order model (PSO). In addition, the adsorption isotherms follow Langmuir isotherm model and the maximum monolayer adsorption capacity was found to be 11.41 mg/g. The calculated thermodynamic parameters (i.e., ∆G o , ∆H o , ∆S o) indicate that the proposed adsorption process of methylene blue onto CoFe1.9Cr0.1O4 nanoparticles is exothermic and spontaneous in nature. The results suggest that the synthesized magnetic nanoparticles (CFC) can be employed for the removal of toxic cationic synthetic dyes from wastewater.
Journal of Water Process Engineering, 2016
Present study is an endeavour to explore adsorption potential cobalt ferrite nanoparticles which were synthesised by combustion method and its surface modification was done by a SDS surfactant to make it suitable for the removal of cationic dye. Characterization was carried through FTIR, SEM and XRD analysis. Batch adsorption studies were carried out for removal of crystal violet cationic dye by SDS coated cobalt ferrite. Various parameters like initial concentration (50-300 mg/L), effect of contact time, adsorbent dose (0.1-0.5 gm/50 mL), and pH (2-9) were studied at constant temperature. Equilibrium time for the adsorption process was found to be 2 h. Adsorption percentage of dye increased with an increase in the adsorbent dose and amount of adsorption increased with an increase in initial dye concentration. Initial pH in the basic region exhibited better results as compared to acidic pH. Langmuir adsorption isotherm fitted better than Temkin followed by Freundlich and Dubinin-Raduskevich adsorption isotherms. Monolayer adsorption capacity was found to be 105 mg/g which is comparable to other reported adsorbents. Adsorption followed Lagergren pseudo second order kinetics model better than Lagergren pseudo first order and Elovich models. Adsorption studies conducted at different temperatures (301-313 K) indicated rise in adsorption with the increase in temperature. This implied that sorption phenomenon was endothermic in this case. Data was fitted to Van't Hoff equation to study thermodynamics. Value of H • was in the range of 23-88 kJ/mol for different concentration which indicated that mechanism of adsorption was complex comprising of both physical and chemical adsorption.
Institute for Color Science and Technology (ICST), 2019
Intelligent modelling. erein, magnetic cobalt ferrite nanoparticles (CFNPs) was synthesized and its surface was modified by cationic surfactant (cetyltrimethyl ammonium bromide: CTAB) and its potential to selective removal of dye from multicomponent (ternary) system was investigated. Direct red 31 (DR31), Direct green 6 (DG6) and Direct red 23 (DR23) were used as a model dyes. The characteristics of the synthesized adsorbent (CFNPs-CTAB) nanoparticles were studied using FTIR, SEM, TEM, XRD, and TOC. Selectivity analysis showed that the magnetic adsorbent had selective removal of DR31. A reliable and intelligent model based on Least-Squares Support Vector machine (LS-SVM) was used to present pollutant adsorption efficiency. The presented model illustrates better performance in predicting dye removal efficiency compared to the kinetic models with average absolute percent relative error of 2.024% and correlation coefficients close to unity. Moreover, it was showed that the developed models are capable of simulating the actual physical trend of the dye removal efficiency with variation of adsorbent dosage, initial dye concentration, salt and initial pH of solution. The proposed model could be trustful for predicting the dye removal efficiency from colored wastewater. Prog. Color Colorants Coat. 12 (2019), 163-177© Institute for Color Science and Technology.
Photocatalytic treatment of wastewater from azo dyes with semiconductors promises efficient method to refine water. Cobalt ferrite is synthesized and utilized for dye removal as a semiconducting composite. To compare the photocatalytic performance of its individual oxides, Co 3 O 4 and FeO were synthesized by the same route and applied to water treatment. In this work, cobalt ferrite, Co 3 O 4, and FeO nanoparticles were synthesized as photocatalysts by employing wet chemical method with chloride precursors respectively (CoCl 2 .6H 2 O & FeCl 3 .6H 2 O, CoCl 2 .6H 2 O, FeCl 3. 6H 2 O). The synthesized photocatalysts were characterized by powder X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS) and field emission scanning electron microscopy (FESEM). The obtained photocatalysts were coated on the glass by Dr. Blade method. The degradation of Acid Black 1 (AB1) and Reactive Red 4 (RR4) by cobalt ferrite, Co 3 O 4 and FeO were carried out under UV light irradiation to investigate their photocatalytic activities. FeO nanoparticles were found as the best photocatalyst to achieve maximum degradation of Azo dyes. The high degradation performance of FeO can be attributed to the photo-Fenton phenomena-like furthermore photocatalytic process. The Degradation rate of AB1 by photocatalysts decreases in the order of FeO > Co 3 O 4 > CoFe 2 O 4. The photocatalytic degradation kinetics of AB1 using photocatalyst nanoparticles was found to be the first order kinetic rate. For RR4, CoFe 2 O 4 followed first order, FeO and Co 3 O 4 followed a second order kinetic rate. Presence of iron oxide in cobalt ferrite improved the photocatalytic performance.. How to cite this article Parhizkar J, Habibi MH. Investigation and Comparison of Cobalt ferrite composite nanoparticles with individual Iron oxide and Cobalt oxide nanoparticles in azo dyes removal.
Journal of Nanomaterials, 2022
The current water supply situation demonstrates the predominance of contamination caused by industrial effluent runoff. Polluted waters have contributed to significant health and environmental risks, calling for an acceptable alternative to address the effects. However, diverse chemical and treatment physical stages commonly used for dye effluent processing are more cost-intensive, less effective, and time-consuming. Instead, nanomaterials have developed as a good alternative for dye removal and degradation because of their special chemical reactivity and superior surface features/properties. In this regard, the ability of modified or hybrid ferrite-based magnetically recoverable nanomaterials in dye effluent treatment has been extensively explored. The present study especially emphasizes magnetic ferrite (Fe3O4 + X) or metal-doped ferrite (MFe2O4 + X) nanocomposite for dye degradation (where M consists of Co, Cu, Zn, Mg, Mn, Ni, etc., and X consists of reduced graphene oxide, graphene oxide, metal, or metal oxide). Several dye degradation efficiencies of various ferrite and metal ferrite nanomaterials were discussed. Degradation is carried out using direct sunlight, and various lamps (e.g., visible light/UV-C lamp/halogen lamp/Mercury-Xenon lamp/UV lamp with UV filter for visible light) are used as a source. This review article covers the degradation of various dyes from wastewater using ferrite-based nanomaterial as an efficient catalyst, making water pollution free.
Nanomaterials, 2021
A research study was conducted to establish the effect of the presence of sodium bis-2-ethyl-hexyl-sulfosuccinate (DOSS) surfactant on the size, shape, and magnetic properties of cobalt ferrite nanoparticles, and also on their ability to remove anionic dyes from synthetic aqueous solutions. The effect of the molar ratio cobalt ferrite to surfactant (1:0.1; 1:0.25 and 1:0.5) on the physicochemical properties of the prepared cobalt ferrite particles was evaluated using different characterization techniques, such as FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption analysis, and magnetic measurements. The results revealed that the surfactant has a significant impact on the textural and magnetic properties of CoFe2O4. The capacity of the synthesized CoFe2O4 samples to remove two anionic dyes, Congo Red (CR) and Methyl Orange (MO), by adsorption from aqueous solutions and the factors affecting...
Direct dyes removal using modified magnetic ferrite nanoparticle
Journal of environmental health science & engineering, 2014
The magnetic adsorbent nanoparticle was modified using cationic surface active agent. Zinc ferrite nanoparticle and cetyl trimethylammonium bromide were used as an adsorbent and a surface active agent, respectively. Dye removal ability of the surface modified nanoparticle as an adsorbent was investigated. Direct Green 6 (DG6), Direct Red 31 (DR31) and Direct Red 23 (DR23) were used. The characteristics of the adsorbent were studied using Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effect of adsorbent dosage, initial dye concentration and salt was evaluated. In ternary system, dye removal of the adsorbent at 90, 120, 150 and 200 mg/L dye concentration was 63, 45, 30 and 23% for DR23, 97, 90, 78 and 45% for DR31 and 51, 48, 42 and 37% for DG6, respectively. It was found that dye adsorption onto the adsorbent followed Langmuir isotherm. The adsorption kinetic of dyes was found to conform to pseudo-second order kinetics.