Highly Efficient Removal of Mercury Ions from Aqueous Solutions by Thiol-Functionalized Graphene Oxide

Sun, Qiang; Wang, Lixia; Li, Ying; Li, Li; Li, Shuping; Zhu, Guangcan

doi:10.3390/w15142529

Cited by 14 publications

(3 citation statements)

References 27 publications

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“…We conducted a comparative analysis of the Hg(II) adsorption capabilities of SiO 2 –Al 2 O 3 –Silane-SH with other thiol-modified materials synthesized using solution-phase methods (Table S1). The Q max of Hg(II) adsorption on SiO 2 –Al 2 O 3 –Silane-SH (0.251 mmol/g) was found to be lower compared to other materials (0.97–5.98 mmol/g). − This discrepancy can be attributed to the lower surface area and differing grafted thiol densities of SiO 2 –Al 2 O 3 –Silane-SH. Upon normalization of the Q max values by the thiol density, representing the ratio of thiols accessible by Hg(II) ions, it was observed that most thiol-modified materials exhibited an accessibility ranging from 0.86 to 0.96.…”

Section: Results and Discussionmentioning

confidence: 99%

“…To contextualize this, we compared the grafted thiol density of SiO 2 –Al 2 O 3 –Silane-SH with other thiol-modified materials (Table S1). − Thiol grafting on graphene oxide-based materials exhibited a lower density (2.69 molecules/nm 2 ), likely attributed to the lower hydroxyl density of graphene oxides . Conversely, silica-based materials synthesized via solution-phase methods demonstrated a higher thiol density (7.24–7.65 molecules/nm 2 ), possibly due to the formation of multilayer silane reactions during solution-phase reactions. , …”

Section: Results and Discussionmentioning

confidence: 99%

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Thiol-Functionalized Adsorbents through Atomic Layer Deposition and Vapor-Phase Silanization for Heavy Metal Ion Removal

Rozyyev,

Gao,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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The removal of toxic heavy metal ions from water resources is crucial for environmental protection and public health. In this study, we address this challenge by developing a surface functionalization technique for the selective adsorption of these contaminants. Our approach involves atomic layer deposition (ALD) followed by vapor-phase silanization of porous substrates. We utilized porous silica gel powder (∼100 μm particles, 89 m 2 /g surface area, ∼30 nm pores) as an initial substrate. This powder was first coated with ∼0.5 nm ALD Al 2 O 3 , followed by vapor-phase grafting of a thiolfunctional silane. The modified powder, particularly in acidic conditions (pH = 4), showed high selectivity in adsorbing Cd(II), As(V), Pb(II), Hg(II), and Cu(II) heavy metal ions in mixed ion solutions over common benign ions (e.g., Na, K, Ca, and Mg). Langmuir adsorption isotherms and breakthrough adsorption studies were conducted to assess heavy metal binding affinity and revealed the order of Cd(II) < Pb(II) < Cu(II) < As(V) < Hg(II), with a significantly higher affinity for As(V) and Hg(II) ions. Time-dependent uptake studies demonstrated rapid removal of heavy metal ions from aqueous environments, with Hg(II) exhibiting the fastest adsorption kinetics on thiol-modified surfaces. These findings highlight the potential of ALD and vapor-phase silanization to create effective adsorbents for the targeted removal of hazardous contaminants from water.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Thiol-Functionalized Adsorbents through Atomic Layer Deposition and Vapor-Phase Silanization for Heavy Metal Ion Removal

Rozyyev,

Gao,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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show abstract

“…They also produce colloids and sludge at quantities much higher than the original heavy metals [13]. For this reason, a number of adsorbents have been developed for the removal of heavy metals from industrial effluent, including activated charcoal [14], biomass [15][16][17], polymers [18][19][20], fly ash [21], zeolites [22], and graphene oxide [23]. Other methods that have been used to decrease the metal ion concentration in water include ultra-filtration, electrolysis, phytoextraction, and reverse osmosis.…”

Section: Introductionmentioning

confidence: 99%

Sequestration of Toxic Metal Ions from Industrial Effluent Using the Novel Chelating Resin Tamarind Triazine Amino Propanoic Acid (TTAPA)

Mandal

Abomuti

Al‐Harbi

et al. 2023

Water

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Due to higher levels of industrial activity, the concentrations of toxic substances in natural water bodies are increasing. One of the most dangerous groups of toxic compounds is heavy metals, with even trace amounts of most heavy metals being harmful to aquatic life. This is why purifying water has become an urgent priority. In this context, ion-exchange resins have become more widely used in water treatment processes. However, to reduce the costs and improve the sustainability of this strategy, natural resins are favored over synthetic versions. Therefore, in the present study, a natural tamarind-based chelating resin was developed. The tamarind triazine amino propanoic acid (TTAPA) resin was synthesized and characterized using Fourier-transform infrared spectroscopy, thermogravimetry analysis, scanning electron microscopy, elemental analysis, and physicochemical analysis of the moisture content, total ion-exchange capacity, bulk volume, bulk density, and percentage nitrogen content. The biological oxygen demand and chemical oxygen demand of the industrial effluent before and after treatment were also analyzed. The batch analysis was used to determine the distribution coefficient and percentage removal of the metal ions Fe(II), Zn(II), Pb(II), Cu(II), and Cd(II). The removal efficiency of the prepared TTAPA resin was highest for Fe(II), followed by Cu(II), Zn(II), Pb(II), and Cd(II) in order. The chelating ion-exchange resin also had a metal ion recovery of more than 95%, thus demonstrating great promise for the sequestration of heavy metal ions from industrial wastewater. The proposed TTAPA resin is biodegradable, non-toxic, cost-effective, reproducible, and eco-friendly.

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Enhanced performance of amine and thiol chemically modified graphene oxide for effective removal of Hg(II), Pb(II), and Cr(VI) from aqueous solution

Bakry,

Alamier,

Abdallah

et al. 2024

Appl Water Sci

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This study describes a novel adsorbent with a multidentate ligand that was facilely fabricated by covalently bonding 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole on graphene oxide (AHMT-PRGO). The AHMT-PRGO nano-adsorbent was used for the effective removal of Hg(II), Pb(II), and Cr(VI) from wastewater. The AHMT-PRGO nano-adsorbent was synthesized by a nucleophilic substitution reaction between GO acyl chloride and AHMT chelating ligand in the presence of tetrabutyl-ammonium bromide as a catalyst. The successful modifications were confirmed via several spectroscopic and electron microscopy instrumentations including UV–Vis, FTIR, Raman, XRD, XPS, SEM, and TEM. The maximum adsorption capacities of Hg(II), Cr(VI), and Pb(II) on the AHMT-PRGO nano-adsorbent were 370.0, 136.2, and 109.6 mg/g, respectively, exceeding those of most previously reported adsorbents. Additionally, the equilibrium contact times for Hg(II), Pb(II), and Cr(VI) were 60, 30, and 400 min, respectively. In a mixture of nine heavy metal ions containing 250 ppm of each ion, the AHMT-PRGO nano-adsorbent exhibited high selectivity for Hg(II) ions. Furthermore, the AHMT-PRGO nano-adsorbent showed high stability over five adsorption–desorption cycles. Additionally, the AHMT-PRGO nano-adsorbent was successfully applied to remove heavy metal ions from real water samples. The novelty of AHMT-PRGO lies in the combination of a multidentate ligand for strong and selective binding with the high surface area and stability offered by covalently bonded graphene oxide. This combination offers potential advantages over traditional adsorbents in terms of adsorption capacity, selectivity, and reusability.

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Highly Efficient Removal of Mercury Ions from Aqueous Solutions by Thiol-Functionalized Graphene Oxide

Cited by 14 publications

References 27 publications

Thiol-Functionalized Adsorbents through Atomic Layer Deposition and Vapor-Phase Silanization for Heavy Metal Ion Removal

Thiol-Functionalized Adsorbents through Atomic Layer Deposition and Vapor-Phase Silanization for Heavy Metal Ion Removal

Sequestration of Toxic Metal Ions from Industrial Effluent Using the Novel Chelating Resin Tamarind Triazine Amino Propanoic Acid (TTAPA)

Enhanced performance of amine and thiol chemically modified graphene oxide for effective removal of Hg(II), Pb(II), and Cr(VI) from aqueous solution

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