Magnetic γ-Fe2O3/Fe-doped hydroxyapatite nanostructures as high-efficiency cadmium adsorbents

Xiao, Xiao; Yang, Lei; Zhou, Di; Zhou, Jiabei; Tian, Yaping; Song, Chengsheng; Liu, Can

doi:10.1016/j.colsurfa.2018.07.036

Cited by 39 publications

(3 citation statements)

References 44 publications

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“…7. N2 adsorption-desorption of (a) Fe3O4@SiO2@m-SiO2 and (b) Fe3O4@SiO2@m-SiO2-NH2 Mesoporous silica-calcium phosphate hybrid NPs 314.56 [44] Granular activated carbon 358.00 [45] Activated clay 90.00 [45] Polyacrylamide-modified Fe3O4/MnO2 158.34 [46] Al2O3/carbon composite 358.59 [47] γ-Fe2O3/Fe-doped hydroxyapatite 98.20 [48] Amino-functionalized hollow core-mesoporous shell silica 503.63 [ 49] Fe 3 O 4 @SiO 2 @m-SiO 2 -NH 2 637.38 This work…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Javaheri

Kheshti

Ghasemi

et al. 2019

Separation and Purification Technology

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In this work, a novel amino-functionalized mesoporous microsphere was synthesized to remove cadmium ions from water. The Fe 3 O 4 @SiO 2 @m-SiO 2 -NH 2 micro-spheres were successfully prepared via a facile two-stage process by coating of the as-synthesized magnetic cores with a silica shell followed by increasing the porosity of the structure using a cationic surfactant as structure-directing agents. The template removal from the structure has been performed following the method of solvent extraction and methanolenhanced supercritical fluid CO2 (SCF-CO2) extraction. This novel approach provides the multifunctional microspheres with a high surface area, which improves the adsorption capacity of adsorbent.Characterization of the as-synthesized adsorbent were analytically determined showing that as-prepared adsorbent has a significant surface area of 637.38 m 2 g -1 . The kinetic data agreed with pseudo-second-order model and Langmuir isotherm. The maximum adsorption capacity of the synthesized adsorbent was about 884.9 mg g -1 , and can be easily separated from solution under an external magnetic field. The synthesized microspheres were recycled using HCl and cadmium removal was over 92% after 6 cycles, which confirms the chemical stability and reusability of the manufactured particles.

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Section: Resultsmentioning

confidence: 99%

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Javaheri

Kheshti

Ghasemi

et al. 2019

Separation and Purification Technology

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“…than by the Langmuir model(R 2 = 0.9516, 0.9099, and 0.8806) (Mirbagheri and Sabbaghi 2018). which indicated that the adsorption of Sb(Ⅲ) on the surface of nanosheet-assembled maghemite magnetic microspheres followed the multilayer adsorption, and the adsorption process is dominated by chemical adsorption (Xiao et al 2018). Besides, the values of RL in Langmuir model and 1/n in Freundlich models are between 0 and 1, which indicates that the adsorption of Sb(Ⅲ) onto nanosheet-assembled maghemite magnetic microspheres was favorable (Acar andMalkoc 2004, Zhang et al 2018), the γ-Fe2O3 microspheres prepared in this study shows a high affinity for Sb(Ⅲ).…”

Section: Adsorption Isothermsmentioning

confidence: 88%

Facile synthesis of nanosheet-assembled γ-Fe2O3 magnetic microspheres and enhanced Sb(III) removal

Zhao

Ren

Hursthouse

et al. 2021

Environ Sci Pollut Res

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The development and utilization of magnetic nano adsorption materials with large adsorption capacity and easy separation are the research hotspot nowadays. In this study, nanosheet-assembled maghemite (γ-Fe2O3) magnetic microspheres were successfully synthesized by an environmental friendly, quick and simple method, for enhanced Sb(Ⅲ) removal from aqueous solution. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), and Brunauer-Emmett-Teller (BET) were used to characterize the material. The results showed that the product contained flower-like γ-Fe2O3 microspheres composed of petal-shaped nanosheets interspersed with each other. The specific surface area and pore volume were 69.23 m 2 /g and 0.15 cm 3 /g, respectively. The material has a strong magnetic response, which allows rapid solid-liquid separation under the action of an external magnetic field. The effects of different dosages, solution pH and contact time on the adsorption effect were studied by batch adsorption experiments, and the reusability of the materials was evaluated. Both Freundlich isothermal adsorption model and pseudosecond order kinetic model were able to describe the uptake of Sb(Ⅲ). The maximum adsorption capacity of the material was 47.48 mg/g under optimal conditions. The adsorption mechanism is mainly that Sb and lattice oxygen (OX 2-) form Fe-O-Sb coordination bonds, which is incorporated into the crystal structure of γ-Fe2O3 as inner-sphere surface complexes. The synthetic material has the advantage of simple preparation process, good adsorption capacity, operation over a wide range of pH, and easy physical separation from treatment systems with good potential for future application to treat polluted waste water.

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“…The HAp and HAp composites exhibited low specific surface area compared to FD-HAp. 32,[58][59][60] High-resolution scanning electron microscopy (HR-SEM) showed that VD-HAp and FD-HAp possessed a uniformly distributed rod-like morphology. The respective average dimensions of the VD-HAp and FD-HAp nanorods were 60 nm (length) × 20 nm (width) ± 3 nm and 34 × 8 ± 3 nm (Fig.…”

Section: Structural Analysis Of Vd-hap and Fd-hapmentioning

confidence: 99%

Physical modification of hydroxyapatite: the drastic enhancement of both cation (Cd²⁺) and anion (F⁻) adsorption and recycling efficiency

Panchu¹,

Sekar²,

Kolanthai³

et al. 2023

Environ. Sci.: Nano

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Magnetic γ-Fe2O3/Fe-doped hydroxyapatite nanostructures as high-efficiency cadmium adsorbents

Cited by 39 publications

References 44 publications

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Facile synthesis of nanosheet-assembled γ-Fe2O3 magnetic microspheres and enhanced Sb(III) removal

Physical modification of hydroxyapatite: the drastic enhancement of both cation (Cd²⁺) and anion (F⁻) adsorption and recycling efficiency

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Magnetic γ-Fe2O3/Fe-doped hydroxyapatite nanostructures as high-efficiency cadmium adsorbents

Cited by 39 publications

References 44 publications

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Facile synthesis of nanosheet-assembled γ-Fe2O3 magnetic microspheres and enhanced Sb(III) removal

Physical modification of hydroxyapatite: the drastic enhancement of both cation (Cd2+) and anion (F−) adsorption and recycling efficiency

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Physical modification of hydroxyapatite: the drastic enhancement of both cation (Cd²⁺) and anion (F⁻) adsorption and recycling efficiency