Highly efficient, rapid, and concurrent removal of toxic heavy metals by the novel 2D hybrid LDH–[Sn2S6]

Çelik, Ahmet; Baker, David R.; Arslan, Zikri; Zhu, Xianchun; Blanton, Alicia; Nie, Jing; Yang, Shan; Ma, Shulan; Han, Fengxiang X.; Islam, Saiful M.

doi:10.1016/j.cej.2021.131696

Cited by 33 publications

(28 citation statements)

References 73 publications

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“…MgAl–CO 3 (LDH–CO 3 ), MgAl–NO 3 (LDH–NO 3 ), and (NH 4 ) 2 Mo 3 S 13 ·H 2 O were synthesized as previously described. − LDH–Mo 3 S 13 nanosheets were synthesized with a two-step method: first, exfoliation of LDH nanosheets of the LDH–NO 3 and then the settlement of positively charged LDH sheets in the presence of dissolved Mo 3 S 13 2– anions. More specifically, 200 mg of LDH–NO 3 was added to 20 mL of formamide and stirred for 24 h to exfoliate the positively charged LDH nanosheets.…”

Section: Methodsmentioning

confidence: 99%

Removal of CrO₄^2–, a Nonradioactive Surrogate of ⁹⁹TcO₄^–, Using LDH–Mo₃S₁₃ Nanosheets

Çelik

Quintero

et al. 2022

Environ. Sci. Technol.

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Removal of chromate (CrO4 2–) and pertechnetate (TcO4 –) from the Hanford Low Activity Waste (LAW) is beneficial as it impacts the cost, life cycle, operational complexity of the Waste Treatment and Immobilization Plant (WTP), and integrity of vitrified glass for nuclear waste disposal. Here, we report the application of [MoIV 3S13]2– intercalated layer double hydroxides (LDH–Mo3S13) for the removal of CrO4 2– as a surrogate for TcO4 –, from ppm to ppb levels from water and a simulated LAW off-gas condensate of Hanford’s WTP. LDH–Mo3S13 removes CrO4 2– from the LAW condensate stream, having a pH of 7.5, from ppm (∼9.086 × 104 ppb of Cr6+) to below 1 ppb levels with distribution constant (K d) values of up to ∼107 mL/g. Analysis of postadsorbed solids indicates that CrO4 2– removal mainly proceeds by reduction of Cr6+ to Cr3+. This study sets the first example of a metal sulfide intercalated LDH for the removal of CrO4 2–, as relevant to TcO4 –, from the simulated off-gas condensate streams of Hanford’s LAW melter which contains highly concentrated competitive anions, namely F–, Cl–, CO3 2–, NO3 –, BO3 3–, NO2 –, SO4 2–, and B4O7 2–. LDH–Mo3S13’s remarkable removal efficiency makes it a promising sorbent to remediate CrO4 2–/TcO4 – from surface water and an off-gas condensate of nuclear waste.

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Section: Methodsmentioning

confidence: 99%

Removal of CrO₄^2–, a Nonradioactive Surrogate of ⁹⁹TcO₄^–, Using LDH–Mo₃S₁₃ Nanosheets

Çelik

Quintero

et al. 2022

Environ. Sci. Technol.

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“…NaNO 3 has bad elution effect on Ag + ,H g 2+ and Cu 2+ adsorbed on the sorbent. We selected 0.2 ME DTAa st he complexing agent for heavy metals solutions as described in reported materials of LDH-[Sn 2 S 6 ] [29] and Fe-MoS 4 . [24b] The adsorption and desorption results are depicted in Figure S2.…”

Section: Regeneration and Reusability Of Mo 3 S 13 -Ldhmentioning

confidence: 99%

Mo₃S₁₃²⁻ Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag⁺ Ions to Metallic Ag⁰ Ribbons

et al. 2021

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We demonstrate an ew material by intercalating Mo 3 S 13 2À into Mg/Al layered double hydroxide (abbr.Mo 3 S 13 -LDH), exhibiting excellent capture capability for toxicH g 2+ and noble metal silver (Ag). The as-prepared Mo 3 S 13 -LDH displays ultra-high selectivity of Ag + ,H g 2+ and Cu 2+ in the presence of various competitive ions,w ith the order of Ag + > Hg 2+ > Cu 2+ > Pb 2+ ! Co 2+ ,N i 2+ ,Z n 2+ ,C d 2+ .F or Ag + and Hg 2+ ,e xtremely fast adsorption rates ( % 90 %w ithin 10 min, > 99 %i n1h) are observed. Much high selectivity is present for Ag + and Cu 2+ ,e specially for trace amounts of Ag + ( % 1ppm), achieving al arge separation factor (SF Ag/Cu )o f % 8000 at the large Cu/Ag ratio of 520. The overwhelming adsorption capacities for Ag + (q m Ag = 1073 mg g À1 )a nd Hg 2+ (q m Hg = 594 mg g À1 )p lace the Mo 3 S 13 -LDH at the top of performing sorbent materials.M ost importantly,M o 3 S 13 -LDH captures Ag + via two paths:a )f ormation of Ag 2 Sd ue to Ag-S complexation and precipitation, and b) reduction of Ag + to metallic silver (Ag 0 ). The Mo 3 S 13 -LDH is ap romising material to extract low-grade silver from copper-rich minerals and trap highly toxic Hg 2+ from polluted water.

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“…As a clay-like material, layered double hydroxides (LDHs) have been extensively researched in recent years for heavy metal removal. − LDHs typically have the general formula [(M 2+ ) 1– x (M 3+ ) x (OH) 2 ] x + (A m – ) x / m · n H 2 O] and a layered structure consisting of M 2+ and M 3+ cations octahedrally coordinated by oxygen in positively charged sheets, and anions (A m – ) and water in the interlayer region between the sheets. The LDH structure can accommodate a wide range of divalent and trivalent cations; hence through isomorphous substitution processes, LDHs can offer excellent removal performance for certain heavy metal ions (like Cd 2+ , Ni 2+ , and Cu 2+ ions) leading to superstable mineralization structures (SSMS). − Recently, we reported that CaAl-LDH could be used as a mineralizer to selectively remove Cd 2+ ions from water with a capacity of 592 mg/g via isomorphous substitution to form a SSMS CdAl-LDH .…”

Section: Introductionmentioning

confidence: 99%

Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

et al. 2023

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Water and soil pollution caused by toxic cadmium ions (Cd 2+ ) is a serious threat to animals, plants, and human health. Discovering low-cost mineralizers which can efficiently and stably immobilize Cd 2+ ions is therefore imperative for wastewater treatment and soil remediation. In this work, we report the successful development of a novel mineralizer for Cd 2+ ion capture. A magnesium−aluminum layered double hydroxide (MgAl-LDH) with a monolayer structure (MgAl-mono) was first prepared and then calcined at 350 °C for 4 h to produce a defective MgAl-mono-350. MgAl-mono-350 offered a very high Cd 2+ removal capacity (1385.5 mg/g at 25 °C) and the ability to reduce the concentration of Cd 2+ in aqueous solution from 100 ppm to less than 50 ppb in 15 min (meeting the discharge standard of industrial wastewater). Detailed characterization and computational studies revealed that MgAl-mono-350 possessed abundant oxygen defects, thereby enabling superstable mineralization of Cd 2+ via isomorphous substitution process,and the Cd 2+ ions are immobilized in the generated CdAl-LDH structure. MgAl-mono-350 also offered outstanding selectivity for Cd 2+ ions over other common ions. This work demonstrates the potential of defect-engineered LDH materials for the selective removal of heavy metals from polluted water.

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Highly efficient, rapid, and concurrent removal of toxic heavy metals by the novel 2D hybrid LDH–[Sn2S6]

Cited by 33 publications

References 73 publications

Removal of CrO₄^2–, a Nonradioactive Surrogate of ⁹⁹TcO₄^–, Using LDH–Mo₃S₁₃ Nanosheets

Removal of CrO₄^2–, a Nonradioactive Surrogate of ⁹⁹TcO₄^–, Using LDH–Mo₃S₁₃ Nanosheets

Mo₃S₁₃²⁻ Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag⁺ Ions to Metallic Ag⁰ Ribbons

Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

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Highly efficient, rapid, and concurrent removal of toxic heavy metals by the novel 2D hybrid LDH–[Sn2S6]

Cited by 33 publications

References 73 publications

Removal of CrO42–, a Nonradioactive Surrogate of 99TcO4–, Using LDH–Mo3S13 Nanosheets

Removal of CrO42–, a Nonradioactive Surrogate of 99TcO4–, Using LDH–Mo3S13 Nanosheets

Mo3S132− Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag+ Ions to Metallic Ag0 Ribbons

Efficient and Superstable Mineralization of Toxic Cd2+ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

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Removal of CrO₄^2–, a Nonradioactive Surrogate of ⁹⁹TcO₄^–, Using LDH–Mo₃S₁₃ Nanosheets

Removal of CrO₄^2–, a Nonradioactive Surrogate of ⁹⁹TcO₄^–, Using LDH–Mo₃S₁₃ Nanosheets

Mo₃S₁₃²⁻ Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag⁺ Ions to Metallic Ag⁰ Ribbons

Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets