Role of silica mid-layer in thermal and chemical stability of hierarchical Fe3O4-SiO2-TiO2 nanoparticles for improvement of lead adsorption: Kinetics, thermodynamic and deep XPS investigation

Esfandiari, Naeemeh; Kashefi, Mehrdad; Mirjalili, Mostafa; Afsharnezhad, Sima

doi:10.1016/j.mseb.2020.114690

Cited by 68 publications

(23 citation statements)

References 45 publications

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“…These findings demonstrate the presence of Fe 3+ and Fe 2+ , which appeared as a result of mixing biochar with iron oxide. Satellite peaks of Fe 3+ and Fe 2+ were found at the range of binding energy of 715-720 eV, which is similar to the results of Naeemeh et al[80] and Haixia Wu et al[81]. Figure10cshows that after adsorption of Cd(II), there was a significant displacement of Fe 2p binding energy, implying the occurrence of coordination reactions between Fe and Cd.Figure10shows the broad peaks of magnetic biochar (after adsorption), C1s spectrum, O1s spectrum, Fe2p spectrum, and Cdp2 spectrum.…”

supporting

confidence: 87%

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Saeed

Harun

Sufian

et al. 2021

IJERPH

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Development of strategies for removing heavy metals from aquatic environments is in high demand. Cadmium is one of the most dangerous metals in the environment, even under extremely low quantities. In this study, kenaf and magnetic biochar composite were prepared for the adsorption of Cd2+. The synthesized biochar was characterized using (a vibrating-sample magnetometer VSM), Scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption batch study was carried out to investigate the influence of pH, kinetics, isotherm, and thermodynamics on Cd2+ adsorption. The characterization results demonstrated that the biochar contained iron particles that help in improving the textural properties (i.e., surface area and pore volume), increasing the number of oxygen-containing groups, and forming inner-sphere complexes with oxygen-containing groups. The adsorption study results show that optimum adsorption was achieved under pH 5–6. An increase in initial ion concentration and solution temperature resulted in increased adsorption capacity. Surface modification of biochar using iron oxide for imposing magnetic property allowed for easy separation by external magnet and regeneration. The magnetic biochar composite also showed a higher affinity to Cd2+ than the pristine biochar. The adsorption data fit well with the pseudo-second-order and the Langmuir isotherm, with the maximum adsorption capacity of 47.90 mg/g.

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confidence: 87%

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Saeed

Harun

Sufian

et al. 2021

IJERPH

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“…The peaks located at 711.4 eV and 724.1 eV which belong to Fe 3+ 2p 3/2 and 2p 1/2 [72] . Deconvolution of the peak areas shows that the ratio of Fe 3+ /Fe 2+ was 1.92, comparable to the molar ratio of Fe 3+ /Fe 2+ in Fe 3 O 4 [73] . To conclude, the characterizations of XRD, 57 Fe Mössbauer and XPS confirm that co‐process of bio‐oil with RM could efficiently transform Fe 2 O 3 and FeOOH to Fe 3 O 4 .…”

Section: Resultsmentioning

confidence: 79%

Upgrading Fast Pyrolysis Oil through Decarboxylation by Using Red Mud as Neutralizing Agent for Ketones Production and Iron Recovery

et al. 2022

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In this work, Red Mud, an alkaline solid waste from alumina production, was used as neutralizing agent to convert carboxylic acids in bio‐oil into ketones. The total acidity of the bio‐oil decreased significantly from 152.60 to 0.63 mg KOH/g, while the high heat value boosted from 17.25 to 29.57 MJ/kg. Meanwhile, the leachable alkalinity of Red Mud declined from 65.34 to 3.02 mg HCl/g, mitigating the harmfulness and perniciousness to the environment. Furthermore, characterizations of XRD, XPS and 57Fe Mössbauer spectroscopy indicated that the weak magnetic iron species in Red Mud was completely transformed into stronger magnetic Fe3O4. With magnetic separation the iron recovery reached up to 91.96 % with iron grade of 65.83 %, which is up to the standard of steelmaking raw material. The findings in this research not only open avenue for valorization of bio‐oil but also help explore the resourceful utilization of Red Mud.

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“…In addition, CTAB can also improve the stability of the magnetic material in aqueous solution and facilitate the TiO 2 layer arranging on Fe–Al MMH [ 33 ]. TiO 2 provides high surface area and protects Fe–Al MMH surface from oxidation [ 34 , 35 ]. The surface area of the sorbents was measured and calculated by Brunauer-Emmett-Teller method.…”

Section: Resultsmentioning

confidence: 99%

Surfactant-coupled titanium dioxide coated iron-aluminium mixed metal hydroxide for magnetic solid phase extraction of bisphenols in carbonated beverages

Gamonchuang

Burakham

2021

Heliyon

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In this work, the magnetic sorbents based on different surfactant-coupled titanium dioxide coated iron-aluminium mixed metal hydroxide were investigated as sorbent for extraction of bisphenol compounds. The structure, morphology, and magnetic property of the synthesized sorbents were investigated. The cetyltrimethylammonium bromide-titanium dioxide coated iron-aluminium mixed metal hydroxide (Fe-Al MMH@TiO 2 -CTAB) exhibited excellent extraction performance toward bisphenols and was selected as the sorbent for development of magnetic solid phase extraction (MSPE) method. The entire MSPE process was optimized, and the extract was analyzed by high performance liquid chromatography with photodiode array detector. The method provided wide linear calibration ranges for bisphenols between 0.3-6000 μg L À1 with maximum enrichment factors of 280. The limits of detection and limits of quantification were in the ranges of 0.08-0.3 and 0.3-1.0 μg L À1 , respectively. The proposed MSPE method was tested for determination of bisphenols in carbonated beverages. The studied carbonated beverages were mostly free of bisphenol contamination; however, BPS, BPA and BPB were detected in samples taken from defective cans. The relative recoveries ranging of 80.2-118.9% were obtained. The asprepared Fe-Al MMH@TiO 2 -CTAB sorbent provided high sorption capacities in the range of 2215-2451 mg kg À1 and could be a promising material for bisphenols in beverage samples.

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Role of silica mid-layer in thermal and chemical stability of hierarchical Fe3O4-SiO2-TiO2 nanoparticles for improvement of lead adsorption: Kinetics, thermodynamic and deep XPS investigation

Cited by 68 publications

References 45 publications

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Upgrading Fast Pyrolysis Oil through Decarboxylation by Using Red Mud as Neutralizing Agent for Ketones Production and Iron Recovery

Surfactant-coupled titanium dioxide coated iron-aluminium mixed metal hydroxide for magnetic solid phase extraction of bisphenols in carbonated beverages

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