Tuning of graphene oxide intercalation in magnesium aluminium layered double hydroxide and their immobilization in polyacrylonitrile beads by single step mussel inspired phase inversion: A super adsorbent for lead

Jana, Arijit; Roy, Omkar; Ravuru, Shanmuk Srinivas; De, Sirshendu

doi:10.1016/j.cej.2019.123587

Cited by 24 publications

(5 citation statements)

References 62 publications

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“…The morphology and nanostructure of LDH, GO, GLDH and SGLDH nanofillers were observed by SEM and HRTEM, respectively. The SEM images (Figure 3A,B) show that LDH and GO exhibited an obvious lamellar structure 32,46–49 . As previously reported, the LDH planar transverse size is around 0.3–0.5 μm, 4 while the GO planar transverse dimension is around 100 μm (S3), confirming the possibility of LDH loading on GO.…”

Section: Resultssupporting

confidence: 81%

“…The SEM images (Figure 3A,B) show that LDH and GO exhibited an obvious lamellar structure. 32,[46][47][48][49] As previously reported, the LDH planar transverse size is around 0.3-0.5 μm, 4 while the GO planar transverse dimension is around 100 μm (S3), confirming the possibility of LDH loading on GO. In Figure 3C,D, the GO surface in SGLDH is loaded with a larger number of lamellar layers of LDH compared with GLDH.…”

Section: Microscopic Morphology Of Ldh Gldh and Sgldh Nanofillerssupporting

confidence: 75%

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Effect of graphene oxide/layered double hydroxide modified by 7‐octenyltrimethoxysilane on the mechanical and gas barrier properties of fluoroelastomers

Cong,

Peng,

Yuang

et al. 2024

Polymer Composites

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Layered double hydroxide/graphene oxide (GLDH) composites (SGLDH) modified by 7‐octenyltrimethoxysilane (7‐OTOS) were prepared by co‐precipitation method. The structure and morphology of SGLDH were characterized using x‐ray diffraction, Fourier‐transform infrared spectroscopy (FTIR), x‐ray photoelectron spectroscopy, scanning electron microscopy (SEM), high‐resolution transmission electron microscopy, energy‐dispersive x‐ray spectroscopy, and thermogravimetric analysis. According to the obtained results, 7‐OTOS was successfully grafted onto graphene oxide (GO) and layered double hydroxide (LDH) surfaces. 7‐OTOS was grafted on both GO and LDH surfaces, which is why the amount of LDH loaded on the SGLDH surface was significantly increased compared with that on the GLDH composite. The filler‐matrix interfacial interactions of the SGLDH‐filled fluoroelastomer composites were characterized using contact angle analysis, dynamic mechanical analysis, RPA analysis, FTIR, SEM, and cross‐linking density tests. It was indicated that the interfacial interactions between the SGLDH and matrix were significantly improved, and the SGLDH was well dispersed in the fluoroelastomer composites. In addition, the gas barrier properties and mechanical properties of the fluoroelastomer composites were tested. The carbon dioxide permeability coefficients of the fluoroelastomer composites filled with 10‐phr SGLDH increased by about 32.1% and 20.3%, and the tensile strengths increased by about 47.6% and 27.7%, respectively, compared with those of the fluoroelastomer composites filled with 10‐phr LDH and GLDH.Highlights SLDH nanocomposites are based on silyl ether linkages to increase LDH loading. Elastomer nanocomposites exhibited interfacial cross‐linking mechanism. Interfacial interactions were exhibited between FKM and SGLDH. FKM/SGLDH exhibited enhanced gas barrier properties (+32%) compared to FKM. FKM/SGLDH exhibited enhanced mechanical properties (+47%) compared to FKM.

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Section: Resultssupporting

confidence: 81%

Section: Microscopic Morphology Of Ldh Gldh and Sgldh Nanofillerssupporting

confidence: 75%

Effect of graphene oxide/layered double hydroxide modified by 7‐octenyltrimethoxysilane on the mechanical and gas barrier properties of fluoroelastomers

Cong,

Peng,

Yuang

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

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“…Adsorption, recognized as a simple, efficient, economical, safe, and non-secondary pollution method, stands out as one of the most attractive technologies for the separation and recovery of Pb 2+ . Various adsorption materials, including biomass materials, layered double hydroxides [64], metal-organic frameworks [65], nano-porous adsorbents [66], and carbon-based nanocomposites [67], have been synthesized and applied for the removal of Pb 2+ from wastewater. Researchers have explored the impact of multi-element coexistence systems on the selective adsorption of Pb 2+ by preparing different adsorption materials and employing diverse adsorption conditions.…”

Section: Types and Physicochemical Characteristics Of Heavy Metals In...mentioning

confidence: 99%

Exploring Humic Acid as an Efficient and Selective Adsorbent for Lead Removal in Multi-Metal Coexistence Systems: A Review

Xue,

Hu,

Wan

et al. 2024

Separations

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Water pollution poses a global threat to human health, particularly in terms of ensuring a safe supply of drinking water. The accumulation of heavy metals from various water sources is increasing, driving the search for effective and environmentally friendly approaches and materials for metal removal. This review investigates the selective adsorption of Pb2+ by humic acid (HA) in a multi-metal coexistence solution. The focus is on discussing approaches to the structural identification of HA, highlighting that separation techniques are an effective method to reduce its heterogeneity. Starting from the key structural units of HA, the study reveals the interaction between HA and heavy metals. Approaches to enhance Pb2+ selective adsorption are explored, proposing that introducing activating groups, Ca ion exchange, and optimizing pore structures are effective approaches for improving lead ion selective adsorption. Ca2+ activation is suggested as a future research direction for lead-selective adsorption. Additionally, attaining lead selective adsorption through pH regulation’s significance is emphasized. This research contributes to a fundamental understanding of HA’s role as a selective lead adsorbent while offering practical implications for developing environmentally friendly adsorbent materials. The results aim to advance knowledge in environmental science and water treatment.

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“…The increment in the spacing is an outcome due to either of the three possibilities, i.e., vertical alignment of crown anions, planar orientation, and bilayer configuration of the intercalated species. [26,27] The basal spacing in such intercalation circumstances depends upon the hydrated radius/crystal radius of inorganic anions, bond lengths, and cavity size of organic ring-shaped molecules. [28] As 15-crown-5 is an aliphatic organic compound, the orientation and intercalation of it in the basal space is coupled with the cavity size and CO bond length of the molecule.…”

Section: Materials Characterizationmentioning

confidence: 99%

Discretization and Encapsulation of Palladium inside the Cavity of Crown Ether within the Interlayer of Layered Double Hydroxide for Enhanced Activity: A Case Study with Hydrogenation Reaction

Ravuru

Jana

2022

Adv Materials Inter

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interactions of the catalytic nanoparticles resulting in unsatisfactory performance. [2] In an attempt to overcome the above shortcomings, noble metals were doped through self-assembly and layer by layer configuration on layered sheets of 2D materials (graphene sheets, MoS 2 , reduced graphene oxide, dichalcogenides, etc.) having high charge density and surface to volume ratio. [3][4][5][6] Additionally, the synthesis of these materials is chemical intensive and needs high temperature making the catalyst preparation unfavorable in terms of economic and energy considerations. Thus, the research focus in catalysis is now shifted to tailoring the geometry, electronic configuration, and charge density of the active metal. [7] Several ternary heterojunction compounds, complex and sandwiched geometry-based materials were synthesized to bridge the above-mentioned research gaps. However, a potential catalyst has less structural hindrance and better performance. Therefore, research on single-atom catalysis has gained attention due to the reason that the activity and stability of the catalysts attain the maximum when the size and distribution of the active metal approach the limit of a single atom. Another way to augment the performance and overcome the above limitations is by discretizing the active sites inside the ligand cavities. [8][9][10][11][12] Such flexibility regulates the local atomic arrangement controlling the surface properties easily.Anionic clays, like, layered double hydroxides (LDHs)where M 2+ is a divalent metal ion, M 3+ is a trivalent metal ion, and A n− is an n-valent anion) having exchangeable interlayer anions are suitable candidates as support materials that can be tuned to host the active metal in the interlayer. [13] LDHs are categorized under layered materials having positive lattice charge with intercalated anions, like, CO 3 2− , SO 4 2− , F − , OH − , NO 3 − , Cl − with basal spacing 0.7-0.88 nm. Additional features, like, high surface to volume ratio and charge density make the system versatile for such catalysis applications. Due to the structural heterogeneity, their applications include degradation of pharmaceutical components, organics, methanol oxidation reaction, oxygen evolution reactions, etc. [14][15][16] To enhance the activity of theseThe activity of the noble metal-based heterogeneous catalysts is limited by weak metal-support interactions, aggregation, and low surface to volume (S/V) ratio. The activity can be augmented in many ways. Among them, the discretization of the active sites and redistribution of electron density around the metal atom is an important one. In this work, these two phenomena are studied concerning a model reaction, hydrogenation of p-nitrophenol (p-NP). Herein, 1,4,7,10,13-pentaoxacyclopentadecane ether is introduced in the basal space of layered double hydroxide (LDH) to encapsulate noble Pd0 atom inside the cavity of the crown molecule strategically. The modified LDH (Pda-ECC-L0.10@in situ CoAl LDH) augments the properties, like, high S/V ratio and nonag...

show abstract

Tuning of graphene oxide intercalation in magnesium aluminium layered double hydroxide and their immobilization in polyacrylonitrile beads by single step mussel inspired phase inversion: A super adsorbent for lead

Cited by 24 publications

References 62 publications

Effect of graphene oxide/layered double hydroxide modified by 7‐octenyltrimethoxysilane on the mechanical and gas barrier properties of fluoroelastomers

Effect of graphene oxide/layered double hydroxide modified by 7‐octenyltrimethoxysilane on the mechanical and gas barrier properties of fluoroelastomers

Exploring Humic Acid as an Efficient and Selective Adsorbent for Lead Removal in Multi-Metal Coexistence Systems: A Review

Discretization and Encapsulation of Palladium inside the Cavity of Crown Ether within the Interlayer of Layered Double Hydroxide for Enhanced Activity: A Case Study with Hydrogenation Reaction

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