Efficient recovery of Cr(<scp>vi</scp>) from electroplating wastewater by iron-modified sludge-based hollow-structured porous carbon: coexistence effects and competition for adsorption

Han, Cheng; Liu, Yali; Li, Xin; He, Hongyong; Kang, Xiangtao

doi:10.1039/d1ra06969a

Cited by 6 publications

(2 citation statements)

References 52 publications

(58 reference statements)

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“…The second materials MNPs@SiO 2 -SB-THCA increased by 0.1, 4.9, 25.7, and 33.1%, respectively. This could be due to the fact that metal cations on the surface were absorbed by both MNPs@SiO 2 -SB-THCA and MNPs@SiO 2 -SB-THCTA, which increased the electrostatic attraction with HCrO 4 – and CrO 4 2– . − …”

Section: Resultsmentioning

confidence: 99%

“…Table shows a comparison between the synthesized MNPs-SiO 2 -SB-THCA and MNPs-SiO 2 -SB-THCTA and the previously published − sorbents used to remove Cr(VI) ions from contaminated water. The results of the current study under optimal conditions (0.01 g/L adsorbent dose, 298 K temperature, 1 h contact time, and pH 6) confirmed that the proposed sorbents with a low dose of 0.01 g/L provide efficient removal of Cr(VI) ions with removal capacities of 15.5 and 14.3 mg/g, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Design, Synthesis, and Evaluation of Novel Magnetic Nanoparticles Combined with Thiophene Derivatives for the Removal of Cr(VI) from an Aqueous Solution

Alterary,

Al-Alshaikh,

Elhadi

et al. 2024

ACS Omega

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Most heavy metals are harmful to human health and the environment, even at extremely low concentrations. In natural waters, they are usually found only in trace amounts. Researchers are paying great attention to nanotechnology and nanomaterials as viable solutions to the problem of water pollution. This research focuses on the synthesis of organic thiophene derivatives that can be used as grafted ligands on the surface of silica-coated iron oxide nanoparticles to remove Cr(VI) chromium ions from water. The Vilsmeier−Haack reaction allows the formation of aldehyde groups in thiophene derivatives, and the resulting products were characterized by the FT-IR, NMR, and GC−MS. Schiff base is used as a binder between organic compounds and nanoparticles by the reaction of aldehyde groups in thiophene derivatives and amine groups on the surface of coated iron oxide nanoparticles. Schiff base functionalized Fe 3 O 4 composites (MNPs@SiO 2 -SB-THCA) and (MNPs@SiO 2 -SB-THCTA) were successfully synthesized by homogeneous and heterogeneous methods and characterized by a combination of FT-IR, transmission electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The adsorption studies, kinetic modeling, adsorption isotherms, and thermodynamics of the two materials, MNPs@SiO 2 -SB-THCA and MNPs@SiO 2 -SB-THCTA, were investigated for the removal of Cr(VI) from water at room temperature and at 50 mg/L. The high adsorption capacity at pH 6 for MNPs@SiO 2 -SB-THCTA was 15.53 mg/g, and for MNPs@SiO 2 -SB-THCA, it was 14.31 mg/g.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Design, Synthesis, and Evaluation of Novel Magnetic Nanoparticles Combined with Thiophene Derivatives for the Removal of Cr(VI) from an Aqueous Solution

Alterary,

Al-Alshaikh,

Elhadi

et al. 2024

ACS Omega

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Lewis acid catalysis of polydopamine electropolymerisation as a tool for shaping its morphology and electrochemical properties

Polaczek,

Olejnik,

Gumieniak

et al. 2024

J Mater Sci

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Organic–inorganic semiconductor interfaces are of utmost importance in many photoelectrochemical applications, including water splitting and photodegradation of pollutants. The current work focuses on the fabrication and characterisation of transition metal-loaded polydopamine (PDA) electropolymerised on the surface of titania nanotubes. The structural studies via X-ray photoelectron spectroscopy and electron microscopy confirmed the catalytic effect of d-metal salts on the formation of the PDA layer during electropolymerisation. Cu and Ni loading leads to a significant enhancement of the visible absorption compared to that of the pristine PDA, also confirmed by the density functional theory calculations. Although the boost is greater for the thickest coatings, an excess amount of polymer suppresses the charge transfer and thus photocurrent generation. Synthesis in acidic conditions—optimal for photosensitisation—provides structures with a strong increase in the photocurrent quantum efficiency in the visible range, equal to 20% at 400 nm. Graphical Abstract

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High efficient COVID-19 waste co-pyrolysis char/TiO2 nanocomposite for photocatalytic reduction of Cr(VI) under visible light

Nallaselvam,

Rajamohan,

Kalaiarasu

et al. 2023

Environ Sci Pollut Res

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Efficient recovery of Cr(vi) from electroplating wastewater by iron-modified sludge-based hollow-structured porous carbon: coexistence effects and competition for adsorption

Abstract: Mechanism for the adsorption of hexavalent chromium and methyl orange in a binary system.

Cited by 6 publications

References 52 publications

Design, Synthesis, and Evaluation of Novel Magnetic Nanoparticles Combined with Thiophene Derivatives for the Removal of Cr(VI) from an Aqueous Solution

Design, Synthesis, and Evaluation of Novel Magnetic Nanoparticles Combined with Thiophene Derivatives for the Removal of Cr(VI) from an Aqueous Solution

Lewis acid catalysis of polydopamine electropolymerisation as a tool for shaping its morphology and electrochemical properties

High efficient COVID-19 waste co-pyrolysis char/TiO2 nanocomposite for photocatalytic reduction of Cr(VI) under visible light

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