Effectiveness of gold nanoparticle-coated silica in the removal of inorganic mercury in aqueous systems: Equilibrium and kinetic studies

Solis, Kurt Louis; Nam, Go Un; Hong, Yongseok

doi:10.4491/eer.2015.126

Cited by 13 publications

(7 citation statements)

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“…Metal nanoparticles employed for the removal of heavy metals include Au, Ag and nano-zero-valent iron (n-ZVI) nanoparticles [7,104,105]. To improve the selectivity of some common adsorbents such as silica, alumina and activated carbon, Au and Ag metal nanoparticles have been used together with these materials to form composites or core-shell nanostructured materials [9,105,106]. Solis et al [9] compared the adsorption capacities of a 3.19 nm size Au metal nanoparticle coated on silica and sand and found that the former showed a high affinity towards adsorption of Hg from water with K D (partition coefficient, which is a measure of sorbent affinity towards adsorbate) value of 9.96 l g −1 and adsorption efficiency of 96%.…”

Section: Metal Nanoparticlesmentioning

confidence: 99%

“…Other metals like Ag, Al and Cu also form amalgams with Hg [6,7,104]. The adsorption capacities of Au and Ag metal nanoparticles can be less than or equal to 800 mg g −1 which is comparable to metal oxides but may be relatively expensive [9,105].…”

Section: Metal Nanoparticlesmentioning

confidence: 99%

“…The Hg 2+ ion is highly toxic even at low concentrations and can accumulate in ecosystems, in particular apex predators, causing several disorders and diseases. Methyl mercury (CH 3 Hg + ) is another form of mercury that bioaccumulates in organic tissues, poisoning the food chain [8,9]. The Minamata Convention on Mercury established in October 2013 saw over 130 countries signing, and declared mercury pollution as a global problem that no country can solve alone is a classic example of food poisoning by heavy metals [10].…”

Section: Introductionmentioning

confidence: 99%

“…The most common materials used as adsorbents for heavy metals sequestration are activated carbon, zeolite, silica gel, activated alumina, natural clay (kaolinite, bentonite, illite, stevensite and rectorite) and biomass [9,73]. Silica has been shown to possess a surface area of 200-1500 m 2 g −1 and, together with its porous nature, appears to be a very good adsorbent for heavy metal remediation [9]. Activated carbon with a surface area of 2082 m 2 g −1 has been shown to display the maximum adsorption capacity of 56.2-135.8 mg g −1 over other equally good adsorbent systems [76].…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal pollution and the role of inorganic nanomaterials in environmental remediation

et al. 2021

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Contamination of water and soil with toxic heavy metals is a major threat to human health. Although extensive work has been performed on reporting heavy metal pollutions globally, there are limited review articles on addressing this pernicious phenomenon. This paper reviews inorganic nanoparticles and provides a framework for their qualities required as good nanoadsorbents for efficient removal of heavy metals from water. Different inorganic nanoparticles including metals, metal oxides and metal sulfides nanoparticles have been applied as nanoadsorbents to successfully treat water with high contaminations of heavy metals at concentrations greater than 100 mg l −1 , achieving high adsorption capacities up to 3449 mg g −1 . It has been identified that the synthesis method, selectivity, stability, regeneration and reusability, and adsorbent separation from solution are critical parameters in deciding on the quality of inorganic nanoadsorbents. Surface functionalized nanoadsorbents were found to possess high selectivity and capacity for heavy metals removal from water even at a very low adsorbent dosage of less than 2 g l −1 , which makes them better than conventional adsorbents in environmental remediation.

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Section: Metal Nanoparticlesmentioning

confidence: 99%

Section: Metal Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heavy metal pollution and the role of inorganic nanomaterials in environmental remediation

et al. 2021

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“…Heavy metals and phenolic compounds, which are the most common water pollutants, are found to be highly toxic towards living organisms and are difficult to eliminate from water bodies or even from the biosystem once entered [3][4][5]. Mercury has received greater environmental concern due to its high toxicity, persistence in the environment, and high bioaccumulation [6,7]. Dissolved Hg(II) in an aquatic environment is readily transformed into methylmercury, which is a highly toxic, persistent, and bioaccumulative form of mercury present in assessed for its capability to remove Hg(II) and phenol simultaneously from aqueous solutions under batch and fixed-bed adsorption systems.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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Areca nut waste was utilized to obtain high surface area activated carbon (AC), and it was further functionalized with succinic anhydride under microwave irradiation. The surface morphology and surface functional groups of the materials were discussed with the help of scanning electron microscope(SEM) images and fourier transform infra-red (FT-IR) analysis. The specific surface area of the AC and functionalized-AC was obtained by the Brunauer-Emmett-Teller (BET) method, and found to be 367.303 and 308.032 m 2 /g, respectively. Batch experiments showed that higher pH favoured the removal of Hg(II), whereas the phenol removal was slightly affected by the changes in the solution pH. The kinetic data followed pseudo-first order kinetic model, and intra-particle diffusion played a significant role in the removal of both pollutants. The maximum sorption capacity of Hg(II) and phenol were evaluated using Langmuir adsorption isotherms, and found to be 11.23 and 5.37 mg/g, respectively. The removal of Hg(II) was significantly suppressed in the presence of chloride ions due to the formation of a HgCl 2 species. The phenol was specifically adsorbed, forming the donor-acceptor complexes or π-π electron interactions at the surface of the solid. Further, a fixed-bed column study was conducted for both Hg(II) and phenol. The loading capacity of the column was estimated using the nonlinear Thomas equation, and found to be 2.49 and 2.70 mg/g, respectively. Therefore, the study showed that functionalized AC obtained from areca nut waste could be employed as a sustainable adsorbent for the simultaneous removal of Hg(II) and phenol from polluted water.

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Adsorption Mechanism on Nanomaterials ( NMs )

2021

Sample Preparation With Nanomaterials

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Effectiveness of gold nanoparticle-coated silica in the removal of inorganic mercury in aqueous systems: Equilibrium and kinetic studies

Cited by 13 publications

References 14 publications

Heavy metal pollution and the role of inorganic nanomaterials in environmental remediation

Heavy metal pollution and the role of inorganic nanomaterials in environmental remediation

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Adsorption Mechanism on Nanomaterials ( NMs )

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