Interface-Constrained Layered Double Hydroxides for Stable Uranium Capture in Highly Acidic Industrial Wastewater

Yang, Peipei; Li, Songwei; Liu, Chuntai; Liu, Xianhu

doi:10.1021/acsami.1c01960

Cited by 27 publications

(14 citation statements)

References 55 publications

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“…After adsorption, the peak area and peak intensity of ‐NO 3 ‐ decreased significantly, while the binding energy of other peaks increased. These results indicate that there is ion exchange between LDH/MOF composites and uranium, 56–58 and imidazolium nitrogen atoms in the materials may have some chelating effect on U (VI) 59 . From Figure 14(e,f), the peaks at 529.43, 531.58, and 533.01 eV are attributed to M‐OH (M = Ni, Co and Zn), C‐O, and Si‐O 24,56,60 .…”

Section: Resultsmentioning

confidence: 88%

Efficient extraction of Uranium (VI) from aqueous solution by LDH/MOF composites

Xie,

Huang,

et al. 2023

Applied Organom Chemis

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Study on uranium adsorption materials is crucial in addressing uranium pollution and safeguarding water resources. In this paper, a novel Ni/Co‐LDH@ZIF‐67/8‐MOF (LDH/MOF) composite was fabricated by loading ZIF‐67/8‐MOF on the surface of Ni/Co‐LDH with silane coupling group as bonding agent. The LDH/MOF composite was tested by XRD, FT‐IR, SEM, TGA, and XPS methods. The LDH/MOF composite exhibited exceptional uranium (U (VI)) adsorption capacity, with the Langmuir isotherm model estimating a maximum adsorption capacity of 617.33 mg/g, and the adsorption process followed quasi‐second‐order kinetics. Notably, ultrasonic mixing achieved equilibrium in a mere 5 minutes, outperforming traditional oscillation mixing by a considerable margin, offering new possibilities for enhancing uranium removal efficiency. Furthermore, thermodynamic analysis revealed the spontaneous and endothermic nature of U (VI) adsorption onto LDH/MOF. In addition, XPS investigations provided valuable insights into the adsorption mechanisms, primarily involving surface complexation, chelation, and ion exchange. These innovative findings open new avenues for the development of highly selective and efficient uranium separation methods, highlighting the promising potential of LDH/MOF as a highly prospective material for uranium separation in diverse applications, including environmental remediation and nuclear waste management.

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Section: Resultsmentioning

confidence: 88%

Efficient extraction of Uranium (VI) from aqueous solution by LDH/MOF composites

Xie,

Huang,

et al. 2023

Applied Organom Chemis

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“…The calculated parameters for the kinetic models are presented in Table S2, and the adsorption data closely followed the pseudo-second-order (PSO) model than the other two models. Thus, the controlling mechanisms of Zn 2+ and Fe 3+ adsorption on the E-LDH were the chemisorption interactions that involved the formation of the chelate complex . Furthermore, the chelation mechanism was investigated in depth by quantum chemistry calculation in Section .…”

Section: Results and Discussionmentioning

confidence: 99%

In-Depth Study of Heavy Metal Removal by an Etidronic Acid-Functionalized Layered Double Hydroxide

Chen

Khan

et al. 2022

ACS Appl. Mater. Interfaces

113

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Sorption methodologies play a pivotal role in heavy metal removal to meet the global requirements for uninterrupted access to drinkable water. Standard sorption technologies lack efficiency due to weak adsorbent–metal interaction. To this end, a layered cationic framework material loaded with phosphonate was first fabricated by a facile intercalation method to capture hazardous metals from an aqueous solution. To inquire the removal mechanisms, batch experiments, detection technologies, and simulation calculations were employed to study the interactions at the interface of clay/water. Specifically, the functionalized layered double hydroxide possessed excellent chelation adsorption properties with Zn2+ (281.36 mg/g) and Fe3+ (206.03 mg/g), in which model fitting results revealed that the adsorption process was chemisorption and monolayer interaction. Further, the interfacial interaction between the phosphonate and clay surface was evaluated by molecular dynamics simulation, and a new concept named the interaction region indicator was used to characterize weak interaction and coordinate bonds. The deep insight into the chelation mechanism was visually presented via the orbital interaction diagram. In addition, the regeneration of the spent adsorbent, adsorption column test, and acute toxicity analysis demonstrated that the synthesized material has immense potential in terms of practical usage for the treatment of toxic pollutants. These results provide a novel path for researchers to properly understand the adsorption behavior.

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“…Layered double hydroxides (LDHs), a kind of inorganic layered matrix, have attracted great research interest for environmental and other applications. − The general formula of LDHs is [M II 1– x M III x (OH) 2 ] x + [A x / n H 2 O] x − , with M II and M III representing metallic cations (e.g., Zn 2+ , Ni 2+ , Co 3+ , Fe 3+ , Cr 3+ , Cu 2+ , etc. ), while A denotes an interlayer anion. − LDHs can be used as adsorbents for the removal of hazardous anions (F – , CrO 4 2– , and HAsO 4 2– ) − by the ion-exchange properties and removal of heavy-metal cations (Cd 2+ , Ni 2+ , and Zn 2+ ) through the isomorphous substitution ,, or chelation process . The K sp value of Cr 3+ -containing LDH (∼10 –62 ) is significantly lower than that of Cr(OH) 3 (∼10 –31 ), suggesting that Cr 3+ ions can be effectively mineralized when the Cr 3+ ions are introduced to the LDH .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO

Shen

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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The removal of CrIII ions from contaminated wastewater is of great urgency from both environmental protection and resource utilization perspectives. Herein, we developed a superstable mineralization method to immobilize Cr3+ ions from wastewater using CuO as a stabilizer, leading to the formation of a CuCr layered double hydroxide (denoted as CuCr-LDH). CuO showed a superior Cr3+ removal performance with a removal efficiency of 97.97% and a maximum adsorption capacity of 207.6 mg/g in a 13000 mg/L Cr3+ ion solution. In situ and ex situ X-ray absorption fine structure characterizations were carried out to elucidate the superstable mineralization mechanism. Two reaction pathways were proposed including coprecipitation–dissolution and topological transformation. The mineralized product of CuCr-LDH can be reused for the efficient removal of organic dyes, and the adsorption capacities were up to 248.0 mg/g for Congo red and 240.1 mg/g for Evans blue, respectively. Moreover, CuCr-LDH exhibited a good performance for photocatalytic CO2 reduction to syngas (H2/CO = 2.66) with evolution rates of 54.03 μmol/g·h for CO and of 143.94 μmol/g·h for H2 under λ > 400 nm, respectively. More encouragingly, the actual tanning leather Cr3+ wastewater treated by CuO showed that Cr3+ can reduce from 3438 to 0.06 mg/L, which was much below discharge standards (1.5 mg/L). This work provides a new approach to the mineralization of Cr3+ ions through the “salt-oxide” route, and the findings reported herein may guide the future design of highly efficient mineralization agents for heavy metals.

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Interface-Constrained Layered Double Hydroxides for Stable Uranium Capture in Highly Acidic Industrial Wastewater

Cited by 27 publications

References 55 publications

Efficient extraction of Uranium (VI) from aqueous solution by LDH/MOF composites

Efficient extraction of Uranium (VI) from aqueous solution by LDH/MOF composites

In-Depth Study of Heavy Metal Removal by an Etidronic Acid-Functionalized Layered Double Hydroxide

Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO

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