New modified poly(vinylamine)-gels as selective and efficient Hg 2+ ions adsorbents

Shandil, Yashwant; Dautoo, Umesh K.; Chauhan, Ghanshyam S.

doi:10.1016/j.cej.2017.01.133

Cited by 36 publications

(5 citation statements)

References 35 publications

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“…When an external magnetic field was applied, the MNP@OW and HC@SiO 2 @MNP@OW shifted rapidly toward the walls of the vial and the fluid became clarifying within less than 6 sec and 26 sec respectively. This confirms that under the presence of an applied magnetic field, it is easy to separate the MNP@OW and HC@SiO 2 @MNP@OW from an aqueous medium [25,26]. The distinctive property makes MNP@OW and HC@ SiO 2 @MNP@OW possible to be an ideal material for adsorbent and carrier [32].…”

Section: Vsm Analysissupporting

confidence: 64%

“…The resulting grey colored HC@SiO 2 @MNP@OW were magnetically separated and cleansed by washing with methanol and deionized water (each three times). The HC@SiO 2 @MNP@OW particles were vacuum dried at 65°C for 10 h and stored in labelled vials [25,26].…”

Section: Preparation Of Homo-cysteine Functionalised Silica Coatedmentioning

confidence: 99%

“…To explore the influences of individual parameters and to determine the optimum levels on the mercury adsorption using fabricated adsorbent a considerable number of variable experiments were carried while maintaining the levels of other operational factors constant [16,26]. In the present work, the initial optimal values for adsorbent dose (10-60 mg), contact time (15-75 min), pH (2-10), and temperature (40-120°C) were chosen.…”

Section: Effect Of Parameters On the Adsorption Capacity Of Developed...mentioning

confidence: 99%

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Green synthesis of DL-homocysteine decorated magnetic nanoparticles for selective and efficient mercury remediation from simulated wastewater: Kinetics, isotherm, and mechanism studies

Gour,

Kumar,

Arland

et al. 2023

Environmental Engineering Research

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The present study focuses on the facile green synthesis of magnetic nanoparticles (MNPs) using onion waste of Allium Cepa L. (MNP@OW) for effective removal of noxious mercury from simulated wastewater. Photogenically synthesized MNPs were functionalized with DL-homocysteine (HC@SiO2@MNP@OW) for selective mercury adsorption. Various characterization techniques were employed to confirm their physical properties. Vibrating sample magnetometer (VSM) studies indicated MNP@OW’s superparamagnetic nature with a saturation magnetization (Ms) of 48.35 emu/g, while HC@SiO2@MNP@OW had a reduced Ms of 4.52 emu/g due to a coating of non-magnetic silica and DL-homocysteine. Both adsorbents showed optimal adsorption at 80°C and pH 8. However, it is explicitly mentioned that HC@SiO2@MNP@OW demonstrated efficient mercury removal at a lower dosage and shorter contact time compared to MNP@OW. Fast separation times of 6 and 26 seconds for MNP@OW and HC@SiO2@MNP@OW, respectively, confirm their ease of separation from simulated wastewater. The Freundlich isotherm model fit the data well and kinetic analysis supported a pseudo-second-order model, revealing a chemisorption mechanism. Moreover, HC@SiO2@MNP@OW demonstrated high selectivity, even in the presence of co-existing ions. Green synthesized MNP@OW and HC@SiO2@MNP@OW exhibited promising potential as low-cost sorbents for efficient mercury removal from simulated wastewater, making them feasible for wastewater treatment in low-economic countries.

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Section: Vsm Analysissupporting

confidence: 64%

Section: Preparation Of Homo-cysteine Functionalised Silica Coatedmentioning

confidence: 99%

Section: Effect Of Parameters On the Adsorption Capacity Of Developed...mentioning

confidence: 99%

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Green synthesis of DL-homocysteine decorated magnetic nanoparticles for selective and efficient mercury remediation from simulated wastewater: Kinetics, isotherm, and mechanism studies

Gour,

Kumar,

Arland

et al. 2023

Environmental Engineering Research

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“…Binding Hg(II) ions to different types of sorbents based on natural and synthetic polyamines, including polyethylenimine (PEI), was extensively investigated earlier with the main focus on the sorption capacity and sorption mechanism. ,,,,, Very little attention was given to the efficiency of Hg(II) uptake using fixed-bed devices and application at ppb concentrations that is relevant to the water treatment and mercury preconcentration for environmental monitoring. At Hg(II) concentrations up to 500 mg/L, a high uptake efficiency (90–99%) was reported by many authors ,,,− without discussion of the compliance of the efficiency reached with the target values set by U.S. EPA and WHO for mercury in discharge and drinking waters.…”

Section: Resultsmentioning

confidence: 99%

Flow-Through Polyethylenimine/ZnS Supermacroporous Composite for Hg(II) Uptake at ppb Concentrations

Малахова

Parotkina

Елисейкина

et al. 2022

Ind. Eng. Chem. Res.

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Flow-through supermacroporous monoliths (cryogels) for Hg(II) ion uptake have been fabricated by cross-linking polyethylenimine (PEI) at subzero temperature and in situ functionalization with zinc sulfide nanoparticles to enhance the efficiency of sorption performance. The synergetic effect of Hg(II) chelation by the PEI matrix and ion exchange on ZnS allowed one to reach with a composite cryogel the decontamination factor of >10 5 and the Hg(II) residual concentration of <2 μg/L, which are set by U.S. EPA for mercury discharge to the aqueous environment. Under the same sorption conditions, an unmodified PEI cryogel allowed reducing the Hg(II) concentration down to 3.9 ± 0.3 μg/L, which complies with WHO requirements for drinking water. The effective dynamic sorption capacity at the Hg(II) breakpoint of 6 μg/L was more than twice higher for the PEI/ZnS cryogel than for the unmodified PEI cryogel, while the static sorption capacities of both the PEI cryogel (1214 mg/g) and PEI/ZnS cryogel (1478 mg/g) were significantly higher in comparison with previously reported materials.

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“…Separation methods that discard the damaging metal ions from industrial streams and contaminated water are frequently required [1][2][3][4][5][6]. Multiple approaches including solid phase extraction, precipitation, membrane processes, as well as ion-exchange were utilized to eliminate the pollution arising from harmful metal ions [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. One of the most important natural biopolymer is cellulose.…”

Section: Introductionmentioning

confidence: 99%

Removal of Hg (II) metal ions from environmenta water samples using chemically modified natural sawdust

2020

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In the present study, chemically modified natural saw dust (CMSD) sorbent was prepared via refluxing reaction between citric acid and sawdust. Then, the as prepared CMSD was characterized using scanning electron microscopy (SEM) and FT-IR. The adsorption capability of CMSD towards Hg(II) was significantly increased because of the introduction of carboxylic groups on CMSD's surface during the modification, and the adsorption capability was linearly reliant on carboxylic sites level to some extent. The prepared CMSD was employed for removal of Hg(II) from different samples. Sorption parameters which include pH, temperature, contact time and sorbent and metal ion concentrations were evaluated to determine the best conditions for sorption of Hg(II) onto CMSD sorbent. In addition, the sorption uptake of CMSD was 80 mg g -1 . The prepared CMDS was successfully applied to remove Hg(II) from environmental water samples with recovery % , more than 95%.

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New modified poly(vinylamine)-gels as selective and efficient Hg 2+ ions adsorbents

Cited by 36 publications

References 35 publications

Green synthesis of DL-homocysteine decorated magnetic nanoparticles for selective and efficient mercury remediation from simulated wastewater: Kinetics, isotherm, and mechanism studies

Green synthesis of DL-homocysteine decorated magnetic nanoparticles for selective and efficient mercury remediation from simulated wastewater: Kinetics, isotherm, and mechanism studies

Flow-Through Polyethylenimine/ZnS Supermacroporous Composite for Hg(II) Uptake at ppb Concentrations

Removal of Hg (II) metal ions from environmenta water samples using chemically modified natural sawdust

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