Construction of metal-organic framework/polymer beads for efficient lead ions removal from water: Experiment studies and full-scale performance prediction

Fu, Kaixing; Zhang, Youqin; Liu, Hengzhi; Lv, Chunyu; Guo, Jing; Luo, Jinming; Yin, Kai; Luo, Shenglian

doi:10.1016/j.chemosphere.2022.135084

Cited by 15 publications

(6 citation statements)

References 56 publications

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“…The result shows that the removal efficiencies of Pb 2+ were all above 95.3% under the conditions of pH = 3, 5, 7, 9, and 11, which indicates that CdK- m -COTTTB can maintain excellent adsorption performance under harsh acid–base environments (Figure d). In contrast, some adsorbents containing sulfydryl or smidogen groups cannot maintain their adsorption efficiency due to protonation under acidic conditions. , In addition, the reusability of CdK- m -COTTTB was studied. Encouragingly, the removal efficiency of CdK- m -COTTTB on Pb 2+ could still be maintained above 90% after 5 cycles (Figure e), which demonstrates that CdK- m -COTTTB has excellent renewable ability.…”

Section: Resultsmentioning

confidence: 99%

Bimetal–Organic Frameworks Incorporating Both Hard and Soft Base Active Sites for Heavy Metal Ion Capture

Shen,

Zhang,

Shan

et al. 2024

Inorg. Chem.

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The design and synthesis of stable porous materials capable of removing both hard and soft metal ions pose a significant challenge. In this study, a novel metal−organic framework (MOF) adsorbent named CdK-m-COTTTB was developed. This MOF material was constructed using sulfur-rich m-cyclooctatetrathiophene-tetrabenzoate (m-H 4 COTTTB) as the organic ligand and oxygen-rich bimetallic clusters as the inorganic nodes. The incorporation of both soft and hard base units within the MOF structure enables effective removal of various heavy metal ions, including both soft and hard acid species. In singlecomponent experiments, the adsorption capacity of CdK-m-COTTTB for Pb 2+ , Tb 3+ , and Zr 4+ ions reached levels of 636.94, 432.90, and 357.14 mg•g −1 , respectively, which is comparable to specific MOF absorbents. The rapid adsorption process was found to be chemisorption. Furthermore, CdK-m-COTTTB exhibited the capability to remove at least 12 different metal ions in both separate and multicomponent solutions. The material demonstrated excellent acid−base stability and renewability, which are advantageous for practical applications. CdK-m-COTTTB represents the first reported pristine MOF material for the removal of both hard and soft acid metal ions. This work serves as inspiration for the design and synthesis of porous crystalline materials that can efficiently remove diverse heavy metal pollutants.

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Section: Resultsmentioning

confidence: 99%

Bimetal–Organic Frameworks Incorporating Both Hard and Soft Base Active Sites for Heavy Metal Ion Capture

Shen,

Zhang,

Shan

et al. 2024

Inorg. Chem.

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“…Considering the special adsorption mode of the oxygen-rich ion trap in IEF-11, the theoretical maximum adsorption capacity can be obtained by calculating the content of the oxygen-rich ion trap. Herein, Ti 32 O 48 (SQU) 16 was chosen as the unit block to determine the ion trap content. As shown in Figure S6, four circular traps (class I trap) can be observed from the unit blocks, while two long traps (class II trap) exist above and below each of the single circular aperture (class I traps).…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…Metal–organic frameworks (MOFs), assembled by metal clusters and organic ligands, have been widely used in catalysis, energy storage, chemical sensing, and adsorption/separation. − Benefiting from good water stability, regular channel, and large specific surface, some MOFs have shown great potential for radionuclide extraction and adsorption. − In relevant reports, Lewis basic sites were introduced in MOFs for the capture of Th(IV) and U(VI), such as PCN-222-PA, MOF-LIC-SA, and UiO-66-2COOH. − Besides that, it should be noted that MOFs-selves contain potential active O atoms with lone-pair electrons, existing in the metal cluster and organic ligand. The active O atom with lone-pair electrons can interact with the metal ions with unsaturated valence electrons.…”

Section: Introductionmentioning

confidence: 99%

Efficient Capture of Th(IV) and U(VI) by Radiation-Resistant Oxygen-Rich Ion Traps Based on a Metal–Organic Framework

Chen

Gan

Xiao

et al. 2023

ACS Appl. Mater. Interfaces

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Herein, based on a well-stabilized Ti-MOF (IEF-11), an oxygen-rich ion trap with synergy interaction of active atoms was proposed for the removal of Th(IV) and U(VI) from aqueous solutions. Due to the high coordination number of Ti and compact framework structure, IEF-11 has excellent resistance toward β-ray irradiation, even under 1000 kGy irradiation dosage. Meanwhile, owing to the special chelating effect of the oxygen-rich ion traps, the maximum adsorption amounts of IEF-11 for Th(IV) (pH = 3.0) and U(VI) (pH = 5.0) ions can reach 305.9 and 240.7 mg g–1, and the separation coefficients exceed 200 for Th(IV)/Nd(III), Th(IV)/Sm(III), and Th(IV)/Eu(III) and 100 for U(VI)/Eu(III), U(VI)/La(III), and U(VI)/Sr(II). Moreover, IEF-11 shows fast adsorption kinetics with an equilibrium time of ∼100 min. The adsorption amount almost remains even after four adsorption–desorption cycles. Finally, experimental and theoretical calculations indicate that Th(IV) and U(VI) ions are anchored in the ion trap in the form of chemical bonds. Meanwhile, the circular pore trap (class I trap) than the long pore trap (class II trap) is considered to be the better adsorption site. We expect that our work will provide a new insight for constructing effective adsorbents for radioactive nuclides.

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“…26 However, the rigid configuration and electrostatic repulsion between adjacent chains of alginate is unfavorable for the uniform dispersion of nanoparticles in polymer networks. 27 It has been reported previously that introducing flexible polymers (e.g., sodium polyacrylate (PAA) and poly(vinyl alcohol) (PVA)) to construct double-crosslinked networks enhanced the mechanical stability and interfacial activity of polymer/nanocomposites, 28,29 which is attributed to the formation of additional hydrogen bonds between components. 30 Therefore, the double-network polymer cross-linking provides a potential strategy to fabricate recyclable MoS 2 adsorbents and improve the Hg(II) capture performance of MoS 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In this aspect, given the sustainability and environment-friendliness of biopolymers, alginate-based gels (e.g., calcium alginate (CA)) would be an ideal support for the reconstruction of MoS 2 nanosheets as they can assemble nanomaterials into macroscopic monolith via cation coordination . However, the rigid configuration and electrostatic repulsion between adjacent chains of alginate is unfavorable for the uniform dispersion of nanoparticles in polymer networks . It has been reported previously that introducing flexible polymers (e.g., sodium polyacrylate (PAA) and poly(vinyl alcohol) (PVA)) to construct double-cross-linked networks enhanced the mechanical stability and interfacial activity of polymer/nanocomposites, , which is attributed to the formation of additional hydrogen bonds between components .…”

Section: Introductionmentioning

confidence: 99%

Preparation of Macroporous Double-Network MoS₂-Based Beads for Efficient and Selective Removal of Hg(II) from Water

Li,

Yang,

Zhang

et al. 2024

ACS EST Eng.

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Molybdenum disulfide (MoS 2 ) nanosheets have exhibited remarkable performance in mercury (Hg(II)) immobilization from complex aqueous environments, whereas the issues of aggregation and separation inhibit their application in real-world scenarios. Herein, a facile and general structuring method via polymer cross-linking was presented to construct recyclable double-network MoS 2 -based beads (DMBs) for efficient and selective Hg(II) removal from various water matrices. The porous structure and strong hydrogen-bonding interactions between the polymer and MoS 2 enhanced the reactivity and stability of DMBs for Hg(II) capture. The as-synthesized DMBs exhibited high Hg(II) adsorption capacity (253.6 mg g −1 at 25 °C), rapid kinetics, wide working pH range (2−9), great Hg(II) selectivity (K d = 8.53 × 10 6 mL g −1 ), and anti-interfering ability. The mechanism of Hg(II) capture by DMBs, mainly the surface coordination (Hg−S) and formation of Hg(II) complexes (-S-HgOHgCl, -S-HgCl, and -S-HgOHgOH), was proposed in combination with characterizations and theoretical calculations. Moreover, the continuous-flow adsorption performance (∼14.5 L of Hg(II)-containing wastewater per gram of adsorbent treated) and reusability (>90% of Hg(II) removal efficiency after 12 cycles) of the DMBs validated their practical applicability. Overall, this study suggests a promising approach for engineering advanced nanomaterials to facilitate their implementations in water purification facilities.

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Construction of metal-organic framework/polymer beads for efficient lead ions removal from water: Experiment studies and full-scale performance prediction

Cited by 15 publications

References 56 publications

Bimetal–Organic Frameworks Incorporating Both Hard and Soft Base Active Sites for Heavy Metal Ion Capture

Bimetal–Organic Frameworks Incorporating Both Hard and Soft Base Active Sites for Heavy Metal Ion Capture

Efficient Capture of Th(IV) and U(VI) by Radiation-Resistant Oxygen-Rich Ion Traps Based on a Metal–Organic Framework

Preparation of Macroporous Double-Network MoS₂-Based Beads for Efficient and Selective Removal of Hg(II) from Water

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Construction of metal-organic framework/polymer beads for efficient lead ions removal from water: Experiment studies and full-scale performance prediction

Cited by 15 publications

References 56 publications

Bimetal–Organic Frameworks Incorporating Both Hard and Soft Base Active Sites for Heavy Metal Ion Capture

Bimetal–Organic Frameworks Incorporating Both Hard and Soft Base Active Sites for Heavy Metal Ion Capture

Efficient Capture of Th(IV) and U(VI) by Radiation-Resistant Oxygen-Rich Ion Traps Based on a Metal–Organic Framework

Preparation of Macroporous Double-Network MoS2-Based Beads for Efficient and Selective Removal of Hg(II) from Water

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Product

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Preparation of Macroporous Double-Network MoS₂-Based Beads for Efficient and Selective Removal of Hg(II) from Water