Magnetite nanoparticles incorporated porous kaolin as a superior heavy metal sorbent for water purification

Lankathilaka, K.P. Wasantha; Silva, Rohini M. de; Mantilaka, M.M.M.G.P.G.; Silva, K.M. Nalin de

doi:10.1016/j.gsd.2021.100606

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…Thus, a conclusion could be drawn that the adsorption of Pb (II) onto Mag-700 was not a multi-molecular adsorption process, and its equilibrium adsorption capacity was 26.21 mg/g. Compared with other magnetite materials, the adsorption performance of lead is even better than that of nanoparticle magnetite (Table 3) (Wang et al, 2010;Wang et al, 2014;Kumari et al, 2015;Liang et al, 2017;Lankathilaka et al, 2021). According to the adsorption and BET test results of the series of materials, the improvement of adsorption performance does not correlate with the specific surface area.…”

Section: Adsorption Isothermmentioning

confidence: 93%

Improvement of magnetite adsorption performance for Pb (II) by introducing defects

Líu

et al. 2023

Front. Chem.

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Surface defect engineering is an efficient strategy to enhance the adsorption properties of materials. After calcination in argon, the adsorption capacity of natural magnetite to Pb (II) is significantly improved. The Rietveld refinement, Mössbauer spectrum, and XPS were used to prove the existence of oxygen and cation vacancies in the crystal structure of magnetite after calcination, and it is found that the vacancy content is linearly related to the adsorption amount of Pb (II). This indicates that the increase in the adsorption performance of magnetite after calcination is determined by the vacancy. The adsorption capacity increases from 8 to 26 mg/g when the calcination temperature reaches 700°C. The equilibrium adsorption process of Pb (II) on magnetite can be well fitted to the Langmuir model, and the kinetic adsorption followed a pseudo-second-order mechanism. The improvement of the adsorption performance of magnetite is mainly due to the change in its structure, which depends on the oxidation degree and surface effect of magnetite in the calcination process. This work also provides a theoretical basis for the broad application of magnetite as environmental material.

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Section: Adsorption Isothermmentioning

confidence: 93%

Improvement of magnetite adsorption performance for Pb (II) by introducing defects

Líu

et al. 2023

Front. Chem.

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“…The engineering of advanced materials for water purification applications is an area of research that has been extensively explored. Conventional nonmembrane techniques for water purification include multistep coagulation, flocculation, sedimentation, filtration, ion exchange, ozone treatment, precipitation, adsorption, and disinfection. − These conventional methods have a number of drawbacks, which can be overcome by novel membrane-based technologies . Membrane systems give improved selectivity, high separation efficiency, high stability, and the possibility of different modes of separation such as adsorption and ion exchange .…”

Section: Introductionmentioning

confidence: 99%

Nanomagnetite- and Nanotitania-Incorporated Polyacrylonitrile Nanofibers for Simultaneous Cd(II)- and As(V)-Ion Removal Applications

et al. 2021

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This work reports the fabrication of nanomagnetite- and nanotitania-incorporated polyacrylonitrile nanofibers (MTPANs) by an electrospinning process, which has the potential to be used as a membrane material for the selective removal of Cd(II) and As(V) in water. The fiber morphology was characterized by scanning electron microscopy (SEM). The incorporation of nanomagnetite and nanotitania in the composite fiber matrix was confirmed by energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The fibers doped with nanomagnetite and nanotitania (MPAN and TPAN fibers, respectively), as well as MTPAN and neat polycrylonitrile (PAN) fibers, after thermally stabilizing at 275 °C in air, were assessed for their comparative As(V)- and Cd(II)-ion removal capacities. The isotherm studies indicated that the highest adsorption of Cd(II) was shown by MTPAN, following the Langmuir model with a q m of 51.5 mg/m2. On the other hand, MPAN showed the highest As(V)adsorption capacity, following the Freundlich model with a K F of 0.49. The mechanism of adsorption of both Cd(II) and As(V) by fibers was found to be electrostatically driven, which was confirmed by correlating the point of zero charges (PZC) exhibited by fibers with the pH of maximum ion adsorptions. The As(V) adsorption on MPAN occurs by an inner-sphere mechanism, whereas Cd(II) adsorption on MTPAN is via both surface complexation and an As(V)-assisted inner-sphere mechanism. Even though the presence of coexistent cations, Ca(II) and Mg(II), has been shown to affect the Cd(II) removal by MTPAN, the MTPAN structure shows >50% removal efficiency even for minute concentrations (0.5 ppm) of Cd(II) in the presence of high common ion concentrations (10 ppm). Therefore, the novel polyacrylonitrile-based nanofiber material has the potential to be used in polymeric filter materials used in water purification to remove As(V) and Cd(II) simultaneously.

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“…Nanomaterials, which will be used as the third filter, are highly preferred in water purification applications due to their large surface area-to-volume ratio and extraordinary properties [13]. Nanomaterials successfully remove heavy metals, organic pollutants, inorganic anions and bacteria from solutions [14].…”

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confidence: 99%

Development of an innovative and original portable pipette with different filtration layers for water purification

Kuyumcu,

Yağmuroğlu

2024

JIENS

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The environment is the external environment in which living creatures on Earth constantly interact throughout their lives. Any negative situation that may occur in the environment greatly affects living life. Increasing industrialization and urbanization along with the ever-increasing population are the main causes of environmental pollution. Water pollution covers the negative effects on the physical, chemical or biological properties of water as a result of human activities. The pollution of water, which is of vital value for living things, due to different factors every day, causes the decrease in potable water resources. In our study, a portable pipette was designed to use different water sources as drinkable water. Four different filter layers were used in the pipette we designed. Filter layers used; coarse filter, activated carbon, magnetic nanoparticle and silver nanoparticle (AgNP). Magnetic nanoparticle and silver nanoparticle were synthesized within the scope of our study. The performance of the purification pipette we developed was investigated with samples containing methyl parathion at different concentrations. In our study, a UV-Vis spectrophotometer was used as an analysis device. As a result of the analyses, it was found that the pipette we developed could purify around 65%, regardless of the concentration of the analyte. The portable purification pipette we developed in our study is promising in terms of making water resources found in nature drinkable, especially in military operations.

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Magnetite nanoparticles incorporated porous kaolin as a superior heavy metal sorbent for water purification

Cited by 15 publications

References 27 publications

Improvement of magnetite adsorption performance for Pb (II) by introducing defects

Improvement of magnetite adsorption performance for Pb (II) by introducing defects

Nanomagnetite- and Nanotitania-Incorporated Polyacrylonitrile Nanofibers for Simultaneous Cd(II)- and As(V)-Ion Removal Applications

Development of an innovative and original portable pipette with different filtration layers for water purification

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