Application of oak powder/Fe3O4 magnetic composite in toxic metals removal from aqueous solutions

Shafiee, Mojtaba; Foroutan, Rauf; Fouladi, Keyhan; Ahmadlouydarab, Majid; Ramavandi, Bahman; Sahebi, Soleyman

doi:10.1016/j.apt.2018.12.006

“…At the same time, compared with the pseudo-first-order kinetics, the adsorption process is more in line with the pseudo-second-order kinetics ( Fig. S7C, S9 and Table S7 ) [ 77 , 78 ]. X-ray photoelectron spectroscopy (XPS) was used to analyze the changes of surface elemental states before and after magnetic nanomotor adsorbent adsorbed Pb(II) in the blood.…”

Section: Resultsmentioning

confidence: 56%

Nanomotor-based adsorbent for blood Lead(II) removal in vitro and in pig models

Wang

¹

,

Bao

²

,

Yan

³

et al. 2021

Bioactive Materials

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Blood lead (Pb(II)) removal is very important but challenging. The main difficulty of blood Pb(II) removal currently lies in the fact that blood Pb(II) is mainly complexed with hemoglobin (Hb) inside the red blood cells (RBCs). Traditional blood Pb(II) removers are mostly passive particles that do not have the motion ability, thus the efficiency of the contact between the adsorbent and the Pb(II)-contaminated Hb is relatively low. Herein, a kind of magnetic nanomotor adsorbent with movement ability under alternating magnetic field based on Fe 3 O 4 nanoparticle modified with meso-2, 3-dimercaptosuccinic acid (DMSA) was prepared and a blood Pb(II) removal strategy was further proposed. During the removal process, the nanomotor adsorbent can enter the RBCs, then the contact probability between the nanomotor adsorbent and the Pb(II)-contaminated Hb can be increased by the active movement of nanomotor. Through the strong coordination of functional groups in DMSA, the nanomotor adsorbent can adsorb Pb(II), and finally be separated from blood by permanent magnetic field. The in vivo extracorporeal blood circulation experiment verifies the ability of the adsorbent to remove blood Pb(II) in pig models, which may provide innovative ideas for blood heavy metal removal in the future.

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“…e Elovich model is usually used to predict the adsorption rate where the chemisorption is carried out in heterogeneous systems. e linear form of the Elovich kinetic model can be expressed as follows [62]:…”

Section: Kinetic Modelsmentioning

confidence: 99%

“…If the heat of adsorption decreases with an increment of the surface coverage, Temkin isotherm governs the adsorption system. e Dubinin-Radushkevich isotherm was developed with regard to the Guassian energy distribution onto the heterogeneous surface of the adsorbent with a linear formula as follows [62]:…”

Section: Isotherm Modelsmentioning

confidence: 99%

Au-O-MWCNTs and TiO2-O-MWCNTs as Efficient Nanocarriers for Dexamethasone: Adsorption Isotherms and Kinetic Studies

Haghighi

¹

,

Khoshfetrat

²

2021

International Journal of Chemical Engineering

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In this research, the fabrication of drug delivery systems based on oxidized multiwall carbon nanotubes (O-MWCNTs) was studied. Herein, TiO2 and Au were conjugated with O-MWCNTs to prepare efficient nanocarriers for dexamethasone (dex). The samples were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). In addition, dex loading was studied using adsorption isotherms including Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich. The results show that dex adsorption agreed well with the Freundlich isotherm. Increasing the TiO2 to O-MWCNT ratio from (1 : 4) to (1 : 2) can improve the adsorption capacity from 290 mg ⋅ g − 1 to 320 320 mg ⋅ g − 1 . The increasing Au amount increases the adsorption capacity from 437.78 mg ⋅ g − 1 (SA1) to maximum 476.19 mg ⋅ g − 1 (SA6). The maximum equilibrium binding energy A T 1.67 L ⋅ mg − 1 was obtained for SA2, and SA7 shows high binding strength between dex and the nanoadsorbent. Carbon nanotubes (CNTs) show good affinity with high loading capabilities for dexamethasone adsorption. The synthesized TiO2-O-MWCNTs:1/2 with the maximum removal percent (80%) was proposed as an appropriate nanocarrier for dexamethasone. Pseudo-first order, pseudo-second order, Elovich, and intraparticle diffusion models were investigated for all synthesized drug nanocarriers. According to regression coefficients, experimental data are in good agreement with the pseudo-second order model for all adsorbents except O-MWCNT/CTAB. Experimental results revealed that the Elovich model could account for the O-MWCNT/CTAB adsorbent.

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“…The main sources of metal pollution are tannery, mining [4], metallurgy, electroplating, production of chemicals, painting, battery production, surface modification industry, garbage incinerator, sludge discharge, processing of radioactive materials, production of electric equipment, pesticides and fertilizers [5] and dyes [6]. According to the World Health Organization (WHO), aluminum, chrome, cobalt, nickel, copper, cadmium, zinc, mercury, and lead are considered as toxic metals [7,8]. The adverse effects of heavy metal ions on humans [9] and other living organisms are continuously increasing from the last of few decades [10,11].…”

Section: Introductionmentioning

confidence: 99%

Surface oxidized and un-oxidized activated carbon derived from Ziziphus jujube Stem, and its application in removal of Cd(II) and Pb(II) from aqueous media

Khan

¹

,

Wahid

²

,

Sultana

³

et al. 2020

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Agricultural waste based low cost oxidized activated carbon (OSD) and un-oxidized activated carbon (USD) samples were prepared from saw dust of Ziziphus jujube by chemical activation with phosphoric acid (H 3 PO 4 ). The activated carbon was used for the removal of toxic metal ions such as cadmium(II) and lead(II) from aqueous solutions. The effect of pH (2-9), initial concentration (70-100 mg/L), contact time (5-700 min), activated carbon dose (0.1-1.0 g) and temperature (298-328 K) was investigated. In addition, the kinetic study was performed at pH 6, while the carbon dose of 0.1 g was used for 40 mL solution of 70 mg/L at four different temperatures (298, 308, 318 and 328 K). The adsorption efficiency of USD was found higher than OSD. Comparatively higher uptake of Pb(II) ions was observed by each carbon sample. Pseudo-second order equation best fitted the experimental data. As such, both activated carbon samples (USD and OSD) exhibited higher adsorption capacities and faster kinetics which revealed their commercial usefulness.

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Application of oak powder/Fe3O4 magnetic composite in toxic metals removal from aqueous solutions

Cited by 95 publications

References 66 publications

Nanomotor-based adsorbent for blood Lead(II) removal in vitro and in pig models

Nanomotor-based adsorbent for blood Lead(II) removal in vitro and in pig models

Au-O-MWCNTs and TiO2-O-MWCNTs as Efficient Nanocarriers for Dexamethasone: Adsorption Isotherms and Kinetic Studies

Surface oxidized and un-oxidized activated carbon derived from Ziziphus jujube Stem, and its application in removal of Cd(II) and Pb(II) from aqueous media

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