Adsorption of mercury ions from wastewater by a hyperbranched and multi-functionalized dendrimer modified mixed-oxides nanoparticles

Arshadi, M.; Mousavinia, F.; Khalafi-Nezhad, Ali; Firouzabadi, Habib; Abbaspourrad, Alireza

doi:10.1016/j.jcis.2017.05.052

Cited by 59 publications

(36 citation statements)

References 33 publications

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“…A method needs to be inexpensive to be considered viable, and thus low-cost materials are desirable, especially those with high capacity and ability to strongly bind mercury in their structure. Many researchers have considered adsorption as the most advantageous technique for the removal of mercury from water [17]. Activated carbon [18], carbon nanotubes [19], synthetic zeolites [20], zeolite nanocomposites [21], clays and mesoporous silicas [22] have been used for the removal of metal ions, including mercury, from water.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of biosourced silica–Ag nanocomposites and amalgamation reaction with mercury in aqueous solutions

Azat

Arkhangelsky

Papathanasiou

et al. 2020

Comptes Rendus. Chimie

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This paper focuses on the synthesis of a new silver nanocomposite adsorbent derived from rice husk as raw material. The synthesis is based on triethoxysilane chemistry and the reduction of silver without the aid of reductant chemicals. The derived AgNPs@SiO 2 nanocomposites are fully characterized and then used for the removal of mercury (II) from aqueous solutions. The results demonstrated that the affinity of the composite for mercury is high and the removal mechanism is adsorption accompanied by a redox reaction between mercury and silver followed by the formation of calomel and amalgams between silver and mercury. The silver-mercury reaction is complex, and its stoichiometry seems to scale with the silver content. Besides the importance of the surface reactions, the successful implementation of biosourced silica for mercury removal from water is useful for the development of strategies for the valorization of agricultural waste and boosts the concept of circular economy and bioeconomy.

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Section: Introductionmentioning

confidence: 99%

Synthesis of biosourced silica–Ag nanocomposites and amalgamation reaction with mercury in aqueous solutions

Azat

Arkhangelsky

Papathanasiou

et al. 2020

Comptes Rendus. Chimie

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“…Discharge of wastewaters with elevated concentrations of mercury and other heavy metals can potentially impact aquatic life and the food chain. 1 − 3 Depending on site-specific conditions such as mercury speciation, geochemical conditions, and the presence of labile organic matter, certain mercury species deposited in sediments can be methylated over time and potentially accumulate in benthic organisms and fish to levels of concern. 4 Development of processes for effective, sustained, and cost-effective removal of dissolved Hg, elemental Hg, and nanoparticulate HgS from various wastewaters has been a challenge to scientists and the engineering community.…”

Section: Introductionmentioning

confidence: 99%

Mercury Removal from Wastewater Using Cysteamine Functionalized Membranes

et al. 2020

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This study demonstrates a three-step process consisting of primary pre-filtration followed by ultrafiltration (UF) and adsorption with thiol-functionalized microfiltration membranes (thiol membranes) to effectively remove mercury sulfide nanoparticles (HgS NPs) and dissolved mercury (Hg 2+ ) from wastewater. Thiol membranes were synthesized by incorporating either cysteine (Cys) or cysteamine (CysM) precursors onto polyacrylic acid (PAA)-functionalized polyvinylidene fluoride membranes. Carbodiimide chemistry was used to cross-link thiol (−SH) groups on membranes for metal adsorption. The thiol membranes and intermediates of the synthesis were tested for permeability and long-term mercury removal using synthetic waters and industrial wastewater spiked with HgS NPs and a Hg 2+ salt. Results show that treatment of the spiked wastewater with a UF membrane removed HgS NPs to below the method detection level (<2 ppb) for up to 12.5 h of operation. Flux reductions that occurred during the experiment were reversible by washing with water, suggesting negligible permanent fouling. Dissolved Hg 2+ species were removed to non-detection levels by passing the UF-treated wastewater through a CysM thiol membrane. The adsorption efficiency in this long-term study (>20 h) was approximately 97%. Addition of Ca 2+ cations reduced the adsorption efficiencies to 82% for the CysM membrane and to 40% for the Cys membrane. The inferior performance of Cys membranes may be explained by the presence of a carboxyl (−COOH) functional group in Cys, which may interfere in the adsorption process in the presence of multiple cations because of multication absorption. CysM membranes may therefore be more effective for treatment of wastewater than Cys membranes. Focused ion beam characterization of a CysM membrane cross section demonstrates that the adsorption of heavy metals is not limited to the membrane surface but takes place across the entire pore length. Experimental results for adsorptions of selected heavy metals on thiol membranes over a wide range of operating conditions could be predicted with modeling. These results show promising potential industrial applications of thiol-functionalized membranes.

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“…Cysteine is a thiol-containing natural amino acid and its strong chelating interaction with mercury and other metals make it particularly suitable for modifying adsorbents. Although there have been several studies regarding the cysteine-modified polymer networks for metal ions removal, [30,31] the cysteine functionalized starch as biosorbent has not been reported elsewhere. In this work, for the first time, we synthesized a cysteine functionalized dialdehyde starch by employing starch and cysteine as the lowcost green biomass raw materials, and used this novel material to absorb Hg (II) from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of a Starch‐Based Adsorbent for the Effective Removal of Environmental Pollutants Hg (II)

Riley

Liu

et al. 2020

Starch Stärke

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In this work, a dialdehyde starch cysteine (DASC) Schiff base is synthesized by the reaction of dialdehyde starch (DAS) and l-cysteine, and subsequently tested to remove Hg (II) from aqueous solution using the batch method. It is also characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscope (SEM), Brunner-Emmet-Teller (BET) measurements, and X-ray photoelectron spectroscopy (XPS) techniques. The results reveal that the DASC is a kind of starch-based Schiff base containing thiol group, which holds excellent adsorption capacity for Hg (II) due to the interaction between sulfur atoms and Hg (II). At 25°C, the equilibrium can be achieved within 2 h and the maximal adsorption capacity of DASC with the substitution degree of 1.14 can be reached at 884.6 mg g −1 at initial pH 5. A relatively high temperature is favorable for the adsorption process of Hg (II). The kinetic and isotherm data are well fitted with the linear forms of pseudo-second order equation and Freundlich model. Additionally, the DASC shows good regenerative adsorption efficiency of 87.07% after four recycles. Owing to the advantages of economical, eco-friendly, high adsorption capacity, and recyclability, DASC may provide valuable information for the treatment of Hg (II) contaminated water.

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Adsorption of mercury ions from wastewater by a hyperbranched and multi-functionalized dendrimer modified mixed-oxides nanoparticles

Cited by 59 publications

References 33 publications

Synthesis of biosourced silica–Ag nanocomposites and amalgamation reaction with mercury in aqueous solutions

Synthesis of biosourced silica–Ag nanocomposites and amalgamation reaction with mercury in aqueous solutions

Mercury Removal from Wastewater Using Cysteamine Functionalized Membranes

Preparation and Characterization of a Starch‐Based Adsorbent for the Effective Removal of Environmental Pollutants Hg (II)

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