Modification of aluminum–silicate nanoparticles by melamine-based dendrimer l-cysteine methyl esters for adsorptive characteristic of Hg(II) ions from the synthetic and Persian Gulf water

Arshadi, M.; Faraji, Ali Reza; Amiri, Mohammad Javad

doi:10.1016/j.cej.2014.12.109

Cited by 56 publications

(26 citation statements)

References 43 publications

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“…The adsorption of Hg (II) thus occured on a homogeneous surface of MCS‐GA by monolayer sorption, which is also in line with the results of the kinetic studies. Several researchers reported monolayer sorption mechanisms for the sorption of Hg 2+ ions onto different adsorbents. However, it should be considered that multilayer adsorption and heterogeneous distribution of active sites on adsorbent surface reflect the dominance of the Freundlich isotherm.…”

Section: Resultsmentioning

confidence: 99%

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe₃O₄ nanocomposites

Azari

Gharibi

Kakavandi

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND: In the present work, Hg (II) is considered as one of the most dangerous elements being released excessively into the environment from various sources. Therefore, the aim of this study is the removal of Hg (II) from wastewater effluent by synthesizing a magnetic chitosan modified with glutaraldehyde (MCS-GA) as an adsorbent. The composite structure was characterized using SEM/EDAX, FTIR, and XRD techniques. The adsorbent was tested by a batch system to determine the optimum conditions for removing Hg (II) under real conditions. RESULTS: The results showed that 0.5% GA effectively enhanced the removal efficiency. The maximum adsorption capacity of MCS-GA was 96 mg g −1 at pH 5.0 and 25 ∘ C. The adsorption isotherm data obeyed the Langmuir model (R 2 >0.981) and pseudo-second-order (R 2 >0.996) kinetic models. It was also found that Hg (II) adsorption on MCS-GA is inherently exothermic and occurs spontaneously. The reusability of MCS-GA was approved over 12 sequential cycles of adsorption-desorption. ANOVA analysis showed that the contact time has a synergistic effect on Hg (II) removal, whereas pH and initial concentration have antagonistic effects. CONCLUSION: Overall, the synthesized adsorbent was able to remove Hg (II) efficiently under both experimental and real conditions.

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Section: Resultsmentioning

confidence: 99%

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe₃O₄ nanocomposites

Azari

Gharibi

Kakavandi

et al. 2016

J of Chemical Tech & Biotech

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“…Although the zeta potential of Lcys-CNCs decreases with pH value (>5) increases, the amount of OH À increases, and OH À groups react with Hg(II) ions to form Hg(OH) + , Hg(OH) 2 , and Hg (OH) 3 À , which reduces the adsorption effect. 41…”

Section: Adsorption Studiesmentioning

confidence: 99%

A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions

Zhang

2019

RSC Adv.

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“…An alter in the color of the obtained powder can also be visualized throughout the modification process. [27,28]. The bands at 2905-2990 and 2825-2870 cm -1 are assigned to the stretching mode of the alkyl chains, which strongly showed that the SiO 2 -Al 2 O 3 mixed oxide has chemically been treated by organic groups.…”

Section: Characterizationmentioning

confidence: 87%

“…The equilibrium adsorption isotherms are an aid to understanding the uptake mechanism and to imply how the adsorbates interact with adsorbents. The experimental removal equilibrium data of SA onto the prepared nanoadsorbents were fitted by the Langmuir (L), Freundlich (F) and Sips (S) isotherm models, which are usual models for aqueous-phase uptake processes (Table S1) [22,27,31]. These uptake models implied a representation of the adsorption equilibrium between the SA molecules in bulk solution and the surface active sites of the nanoadsorbents.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Removal of salicylic acid as an emerging contaminant by a polar nano-dendritic adsorbent from aqueous media

Arshadi

Mousavinia

Abdolmaleki

et al. 2017

Journal of Colloid and Interface Science

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A polar nano-dendritic adsorbent containing amine groups (SAPAMAA) was synthesized onto the nanoparticles of SiOAlO and its uptake of salicylic acid (SA) from the synthetic and real water was investigated. The synthesized nanomaterials were fully studied by nuclear magnetic resonance spectrum (H NMR and C NMR), Fourier transform infrared spectroscopy (FT-IR), zeta potential (ζ), inductively coupled plasma atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) and elemental analysis. Various parameters such as the effect of the contact time, adsorbent dosage, initial SA concentrations, effect of solution's temperature, interfering ions, the hydrophobicity of the nanoadsorbent and initial pH were assessed. The contact time to approach equilibrium for higher adsorption was 15min (252.8mgg). The isotherms could be fitted by Sips model (with the average relative error of 6.6) and the kinetic data could be characterized by pseudo-second-order rate equation (with the average relative error of 13.0), implying chemical adsorption as the ratelimiting step of uptake process which was supported by the experimental data from the effect of interfering ions, zeta potential, and altering of the adsorbent's hydrophobicity. The uptake capacities decreased with temperature increasing, and showed that the uptake of SA was chemically exothermic in nature between 15 and 80°C. In addition, the spent SAPAMAA could be regenerated by the removal of adsorbed SA with NaOH and ethanol to regain the original SAPAMAA, the regenerated SAPAMAA also exhibited the high adsorption capacity after 10 runs. Moreover, SAPAMAA could also be applied to uptake SA from a real water (Anzali lagoon water). We envisage that the prepared nano-dendritic with remarkable characteristics such as environmentally friendly, low-cost, easy preparation in large quantity, high mechanical and chemical stability will play a significant role in developing a new generation of emerging contaminants adsorbent.

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Modification of aluminum–silicate nanoparticles by melamine-based dendrimer l-cysteine methyl esters for adsorptive characteristic of Hg(II) ions from the synthetic and Persian Gulf water

Cited by 56 publications

References 43 publications

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe₃O₄ nanocomposites

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe₃O₄ nanocomposites

A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions

Removal of salicylic acid as an emerging contaminant by a polar nano-dendritic adsorbent from aqueous media

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Modification of aluminum–silicate nanoparticles by melamine-based dendrimer l-cysteine methyl esters for adsorptive characteristic of Hg(II) ions from the synthetic and Persian Gulf water

Cited by 56 publications

References 43 publications

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe3O4 nanocomposites

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe3O4 nanocomposites

A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions

Removal of salicylic acid as an emerging contaminant by a polar nano-dendritic adsorbent from aqueous media

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Product

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Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe₃O₄ nanocomposites

Magnetic adsorption separation process: an alternative method of mercury extracting from aqueous solution using modified chitosan coated Fe₃O₄ nanocomposites