Adsorption behavior of magnetic bentonite for removing Hg(<scp>ii</scp>) from aqueous solutions

Zou, Chenglong; Liang, Jiyan; Jiang, Wei; Guan, Yinyan; Zhang, Yichen

doi:10.1039/c8ra05247f

Cited by 49 publications

(9 citation statements)

References 44 publications

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“…Another challenging aspect of the adsorption process is to separate the contaminant-laden adsorbent after the adsorption process. In this regard, magnetic adsorbents have been studied with different compositions (Cottet et al 2014;Shah et al 2018;Zou et al 2018) for decontamination of water. However, in these studies, mostly bentonites and montmorillonites are used to prepare composites and used to remove dyes and toxic metals.…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Shikuku

Mishra

2021

Appl Water Sci

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In this work, kaolinite clay was modified with magnetic magnetite nanoparticles (Fe3O4@MC) by co-precipitation with ferrous and ferric ions as iron precursors to ameliorate its textural and adsorption capacity for methylene blue (MB) dye uptake from synthetic wastewater at low concentrations. The adsorbents were characterized using XRD, BET surface area analysis, VSM, SEM and HRTEM. The BET surface area after chemical treatment increased from 14.616 to 26.913 m2 g−1. The saturation magnetization of Fe3O4@MC was 6.22 emu g−1 and the exhausted adsorbent recoverable by a simple magnet. Adsorption data were modeled using six nonlinear two-parameter isotherm equations, namely Freundlich, Temkin, Fowler–Guggenheim, Elovich, Flory–Huggins and Langmuir model, and the best-fitting model arrived at using three mathematical error functions. MB adsorption onto unmodified clay was best described by the Fowler–Guggenheim isotherm, whereas MB adsorption onto Fe3O4@MC was best described by the Freundlich model. Increase in BET surface area increased the theoretical and experimental maximum adsorption capacity

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Section: Introductionmentioning

confidence: 99%

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Shikuku

Mishra

2021

Appl Water Sci

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“…where adsorption is considered unfavorable if R L >1, linear if R L =1 and favorable if 0<R L <1 and irreversible if R L =0 [32]. In the case of the three functionalizations, R L ranged from 0.0072 to 0.0475 demonstrating that the nature of the adsorption isotherm is favorable.…”

Section: Resultsmentioning

confidence: 99%

The Use of Voltammetry for Sorption Studies of Arsenic (III) Ions by Magnetic Beads Functionalized with Nucleobase Hydrazide Derivatives

et al. 2021

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In this work the interaction characteristics of nucleobases with As(III) are studied. Novel materials consisting of magnetic nanoparticles (MNPs) functionalized with adenine hydrazide (AH), guanine hydrazide (GH) and uracil hydrazide (UH) were elaborated. The adsorption isotherms were investigated electrochemically and it was shown that the adsorption capacity of the nanoparticles towards arsenic (III) increased in the following order: AH

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“…where, q t (mg/g) is the amount of adsorbed metal ions at the time of t, q e (mg/g) is adsorption capacity, k (min −1 ) is the rst-order rate constant, and k 2 (g/mg min) is the second-order rate constant of adsorption (min −1 ) (Lee et al, 2018;Zou et al, 2018).…”

Section: Adsorption Of Samentioning

confidence: 99%

Biogenic Silica Extracted from Salacca Leaves Ash for The Adsorption of Salycilic Acid

Fatimah

Zaenuri

Doewandono

et al. 2021

Sci. Technol. Indones

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Extraction of biogenic silica from Salacca leaves ash and it’s utilization as adsorbent for salycilic acid has been successfully conducted. The caustic extraction by Refluxing the ash in NaOH followed by slow titration using acid produced the silica gel, and in order to evaluate the physicochemical character for adsorption purpose, the sintering of the dried gel was varied at 300, 400 and 500oC. Instrumental analysis of x-ray diffraction, scanning electron microscopy, gas sorption analysis, and Fourier transform infrared spectroscopy were employed. The kinetics of the salycilic acid adsorption was investigated in a batch adsorption system and the quantitative analysis was based on UV–Vis spectrometry. The results showed that the produced silica exhibited adsorption capability for salycilic acid in an aqueous solution. At varied sintering temperature, the highest adsorption capacity and affinity was achieved by temperature of 500oC, and the adsorption kinetics obeyed the Langmuir isotherm. The varied pH for adsorption suggested neutral pH is the most feasible compared to the acidic and basic conditions.

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Adsorption behavior of magnetic bentonite for removing Hg(ii) from aqueous solutions

Abstract: Bentonite is a porous clay material that shows good performance for adsorbing heavy metals in wastewater remediation. Magnetic bentonite (M-B) was prepared and it was successfully used as an adsorbent to remove Hg(ii) from aqueous solutions in this paper.

Cited by 49 publications

References 44 publications

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

The Use of Voltammetry for Sorption Studies of Arsenic (III) Ions by Magnetic Beads Functionalized with Nucleobase Hydrazide Derivatives

Biogenic Silica Extracted from Salacca Leaves Ash for The Adsorption of Salycilic Acid

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