Removal, preconcentration and determination of Mo(VI) from water and wastewater samples using maghemite nanoparticles

Afkhami, Abbas; Norooz-Asl, Rasoul

doi:10.1016/j.colsurfa.2009.05.024

Cited by 161 publications

(57 citation statements)

References 38 publications

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“…Another important aspect of adsorbents is their separation. Magnetic adsorbents have been increasingly used for simple magnetic separation and accumulation by magnet in various researches (20). Similar studies have been done in this regard.…”

Section: Introductionsupporting

confidence: 57%

The Removal of Lead from Aqueous Solution Using Almond Green Hull (Prunus amygdalus-Fascionello) Waste Material Magnetized with Fe3O4

Nasseh

Khodadadi

et al. 2017

Ann Mil Health Sci Res

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Background: Nowadays, with extensive industrialization, pollution of heavy metals in the environment has increased significantly, which is considered a serious environmental risk for toxicity, carcinogenicity, and biological accumulation. Meanwhile, lead is one of the most important systemic toxic heavy metals, which attacks most organs of the body after adsorption. The aim of this research was to evaluate the efficiency of green almond hull (Prunus amygdalus-Fascionello) magnetized with Fe3O4 to remove lead from aqueous solution. Methods: In this study, the structural characteristic of green almond hull magnetized with Fe3O4 was investigated using a scanning electron microscope (SEM) and vibrating sample magnetometer (VSM) techniques. Also, the effect of different parameters, including pH (2 to 10), mixing speed (0 to 250 rpm), adsorbent dose (1 to 7 g/L), initial concentration (10 to 100 mg/L), and contact time (5 to 200 minutes) was examined to study lead adsorption process by the desired adsorbent. Finally, the experimental data obtained from the equilibrium tests were analyzed using Freundlich and Langmuir isotherms models. Results:The results of this study showed that the maximum removal efficiency was obtained at pH 9 and adsorbent dose of 5 g/L. The removal efficiency was reduced by increasing the initial concentration of lead, and increasing contact time and mixing speed. The maximum lead adsorption at optimal conditions was 91.34%. The results also showed that the resulting data often followed the Langmuir isotherm. Conclusions: According to the results, it could be concluded that green almond hull (Prunus amygdalus-Fascionello) magnetized with Fe3O4 could be used as an affordable and proper adsorbent in removal of lead from aqueous solutions.

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Section: Introductionsupporting

confidence: 57%

The Removal of Lead from Aqueous Solution Using Almond Green Hull (Prunus amygdalus-Fascionello) Waste Material Magnetized with Fe3O4

Nasseh

Khodadadi

et al. 2017

Ann Mil Health Sci Res

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“…The synthesis of magnetite nanoparticles has been intensively developed not only for its great fundamental scientific interest but also for many technological applications in biology [23], medical applications [24], bioseparation [25]; and separation and preconcentration of various anions and cations [26,27], due to their novel structural, electronic, magnetic and catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

et al. 2012

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Abstract:The adsorption of iodine onto silica coated magnetite nanoparticles (im-SCMNPs) that modified with imidazole was investigated for removal of high concentrations of iodine from wastewater. Modified silica magnetite nanoparticles showed high efficiency in removing iodine from wastewater samples. The optimum pH for iodine removal was 7.0-8.0. The adsorption capacity was evaluated using both the Langmuir and Freundlich adsorption isotherm models. The size of the produced magnetite nanoparticles was determined by X-ray diffraction analysis and scanning electron microscopy. Synthesized magnetite nanoparticles showed the high adsorption capacity and would be a good method to increase adsorption efficiency for the removal of iodine in a wastewater treatment process. The Langmuir adsorption capacity (qmax) was found to be 140.84 mg/g of the adsorbent.

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“…Magnetic nanomaterials have been recognized as an efficient adsorbent with large specific surface area and small diffusion resistance [10,15] and are therefore of special interest. The magnetic separation provides suitable route for online separation, where particles with affinity to target species are mixed with the heterogeneous solution.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Ni0.5Zn0.5Fe2O4 for the removal and preconcentration of Cr(VI), Mo(VI), V(V) and W(VI) oxyanions from water and wastewater samples

et al. 2015

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and environmental toxicity, and affect the esthetic quality of the water environment. Removal of heavy metal ions from water resources is important from an environmental protection point of view, because they cause pollution of natural waters and subsequent metal accumulation in the food chain. Hexavalent chromium exists in water as oxyanions such as chromate, HCrO 4 − , and dichromate, the speciation being dependent on pH. Such ions are toxic, carcinogenic, mutagenic, and teratogenic [1,2]. The toxicity of vanadium is also well known [3]. Molybdenum has long been known as one of the biologically active transition elements. Subchronic and chronic oral exposures can result in gastrointestinal disturbances, growth retardation, anemia, hypothyroidism, bone and joint deformities, sterility, liver and kidney abnormalities, and death. Tungsten is an important strategic metal that is used in a variety of industrial applications. Tungsten is released to the environment, e.g., through its use in winter tires. The biogeochemical behavior of W is poorly known. However, it is known that the WO 4 2− ion has an antagonistic effect on the metabolism of MoO 4 2− [4]. Therefore, removal of these ions from water and also determination of their trace amounts in water samples is of great importance. Study for the introduction of efficient methods for the removal and preconcentration of the heavy metal ions, including the above mentioned ions, is interesting to the researchers yet.Different methods have been developed to preconcentration and removal of metal ions from water samples. These include precipitation, ion exchange, membrane separation and adsorption. Among these methods, solid phase extraction has been shown to be an economical alternative for removing trace metals from water [5][6][7][8][9]. In solid phase extraction a suitable sorbent is used as extracting phase and removal or preconcentration takes place by physisorption and/or chemisorption. Abstract Ni 0.5 Zn 0 . 5 Fe 2 O 4 nanocomposite was synthesized and used for the removal and preconcentration of Cr(VI), Mo(VI), V(V) and W(VI) ions. The effect of various parameters such as pH, amount of the adsorbent and contact time on the adsorption efficiency of Cr(VI), Mo(VI), V(V) and W(VI) ions on the adsorbent were studied. The maximum adsorption occurred at pH 4.0 for Cr(VI) and W(VI) and at pH 5.0 for Mo(VI) and V(V). Maximum adsorption capacity (q max ) was estimated using Langmuir adsorption model as 48.5, 38.8, 28.0 and 72.0 mg g −1 for Cr(VI), Mo(VI), V(V) and W(VI) ions, respectively. The adsorbed oxyanions were then desorbed by NaOH solution. The concentration of the ions in desorbed solution was determined spectrophotometrically. Calibration curves were linear for Cr(VI), Mo(VI), V(V) and W(VI) ions in the range 0.7-150.0, 0.9-70.0, 2.0-50.0 and 1.0-40.0 ng mL −1 for an initial sample solution of 100 mL, respectively.Keywords Magnetic nanocomposite · Nickel-zinc ferrite · Cr(VI), Mo(VI), V(V) and W(VI) oxyanions · Water purification · Preconcentration

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Removal, preconcentration and determination of Mo(VI) from water and wastewater samples using maghemite nanoparticles

Cited by 161 publications

References 38 publications

The Removal of Lead from Aqueous Solution Using Almond Green Hull (Prunus amygdalus-Fascionello) Waste Material Magnetized with Fe3O4

The Removal of Lead from Aqueous Solution Using Almond Green Hull (Prunus amygdalus-Fascionello) Waste Material Magnetized with Fe3O4

Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

Effectiveness of Ni0.5Zn0.5Fe2O4 for the removal and preconcentration of Cr(VI), Mo(VI), V(V) and W(VI) oxyanions from water and wastewater samples

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