Preparation of functionalized magnetic graphene oxide/lignin composite nanoparticles for adsorption of heavy metal ions and reuse as electromagnetic wave absorbers

Du, Benni; Chai, Lanfang; Li, Wei; Wang, Xing; Chen, Xiaohong; Zhou, Jinghui; Sun, Run‐Cang

doi:10.1016/j.seppur.2022.121509

Cited by 54 publications

(8 citation statements)

References 81 publications

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“…The vibrations include O–H asymmetric stretch (3439 cm −1 ), C–H stretch in O–CH 3 (2931 cm −1 ), C–H asymmetric stretch in –CH 2 and –CH 3 (2857 cm −1 ), CC stretch in the aromatic ring (1601 cm −1 ), aromatic in-ring C–C stretch (1502, 1456 and 1424 cm −1 ), C–O vibrational stretch of the guaiacyl ring (G-unit) (1262 cm −1 ), combination of C–C + C–O stretch (1196 cm −1 ), C–H in-plane deformation of the aromatic ring (1138 cm −1 ), C–H bending (1089 and 1027 cm −1 ), and C–H out-of-plane deformation of the aromatic ring (812 cm −1 ). 45 Notably, the absence of vibrational bands of condensed guaiacyl + syringyl rings (1326 cm −1 ) and C–H out-of-plane stretch or deformation of the syringyl aromatic ring (843 cm −1 ) proves that the PW biomass mostly contains guaiacyl units.…”

Section: Resultsmentioning

confidence: 97%

Ultrasound-assisted low-temperature catalytic lignin-first depolymerization of pine wood biomass to selectively produce propyl guaiacol

Prabhudesai

Saravanakumar

Gurrala

et al. 2023

Sustainable Energy Fuels

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Section: Resultsmentioning

confidence: 97%

Ultrasound-assisted low-temperature catalytic lignin-first depolymerization of pine wood biomass to selectively produce propyl guaiacol

Prabhudesai

Saravanakumar

Gurrala

et al. 2023

Sustainable Energy Fuels

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“…In addition, a fundamental dimensionless constant R L , the separation factor, can be obtained from the Langmuir isotherm and used to predict the favorability of the adsorption process. The R L equation is shown in Equation (10) [49].…”

Section: T ( C) Pseudo-first-ordermentioning

confidence: 99%

“…Adsorption is widely used for Cu(II) removal because it is simple, efficient, and economical. Commonly used adsorbents for Cu(II) adsorption are graphene oxide, organic skeletons, MXenes, bauxite, zeolite, and clay [8][9][10][11][12][13]. Montmorillonite, a prevalent natural clay mineral, has a 2:1 (silicon-oxygen tetrahedral: aluminum-oxygen octahedral) layered structure with negative net-charge properties and thus has a preferable adsorption capacity for positively charged Cu(II) [14].…”

Section: Introductionmentioning

confidence: 99%

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

Wang

Peng

et al. 2023

J Chinese Chemical Soc

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BackgroundCu(II) is considered to be a heavy metal ion that is quite hazardous to water.AimsZinc oxide‐montmorillonite composite (ZnO‐Mt) for the removal of Cu(II) from aqueous solutions.Materials & MethodsZnO‐Mt was prepared through ion exchange followed by heat treatment to form a highly effective adsorbent.ResultsThe structure and morphology of the composite were investigated by X‐ray diffraction, scanning electron microscope, and fourier transform infrared spectroscopy and it was found that Zinc oxide was successfully coated on montmorillonite. The composite has a superior removal effect on Cu(II) in an aqueous solution with an adsorption capacity of 192.89 mg·g−1. The adsorption kinetic model and the adsorption isotherm model are described by the pseudo‐second‐order kinetic equation and the Langmuir equation, respectively. The activation energy (Ea) was 84.18 kJ·mol−1, indicating that the adsorption was dominated by chemisorption. In addition, ZnO‐Mt can be applied in a wide pH range (3 ~ 8) and exhibits satisfactory selectivity for the adsorption of Cu(II) in the presence of coexisting cations. The removal efficiency of ZnO‐Mt for Cu(II) remains at 72% of the fresh adsorbent after five cycles.DiscussionA combination of experiment, characterization, and density functional theory analysis showed that the mechanism of Cu(II) removal was mainly surface complexation, ion exchange, and electrostatic attraction.ConclusionTherefore, the ZnO‐Mt composite is a promising and efficient adsorbent for the removal of Cu(II) from aqueous solutions.

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“…Meanwhile, due to its distinctive structure and cheap and abundant properties, lignin is considered as a promising carbon-based carrier. It is used to prepare catalysts in various forms such as supported, embedded, and nanosphere structures, as well as functional carbon materials such as supercapacitors and heavy metal adsorbents. − Due to its oxygen-containing functional group, the lignin-based catalyst can embed the metal in the substrate by reaction. This kind of embedded catalyst, in which metal nanoparticles are inserted or partially embedded in mesoporous or microporous materials, is attractive to prevent metal aggregation.…”

Section: Introductionmentioning

confidence: 99%

Efficient Lignin Depolymerization Process for Phenolic Products with Lignin-Based Catalysts and Mixed Solvents

Dang

et al. 2023

Energy Fuels

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Due to their diverse functional groups and structural composition, carbon-based catalysts exhibit superior performance in various catalytic reaction systems, such as hydrogenolysis, hydrogenation, and oxidation. Herein, we propose an effective strategy of lignin liquid-phase depolymerization by applying the designed lignin-based carbon catalysts to produce aromatic chemicals. A series of Ni–Mo bimetallic carbon-based catalysts were synthesized to explore the effect of different preparation methods on the catalytic activity. The results demonstrate that the embedded Ni–Mo/C-WMO catalyst with multi-active sites of Ni, MoO3, and Mo2C results in a prominent catalytic effect on lignin depolymerization. The Ni–Mo/C-WMO catalyst can achieve a lignin conversion of 87.62% with a 42.25% monophenol yield in the methanol and water system. With the synergistic contribution of multiple active sites of the catalyst and the mixed-solvent system (water, methanol, and 1, 4-dioxane), a remarkably high yield of 62.95% of mono-phenolic compound was achieved at 260 °C and 3 MPa N2 with a reaction time of 4 h. The selectivity of 2-methoxy-4-methylphenol and 2-methoxy-4-ethylphenol in liquid products was 40.85 and 36.42%, respectively. Vanillin, a typical product from lignin depolymerization reported in the literature, was further degraded to monophenol in this system. The outcomes also confirmed that the in situ hydrogen production system of methanol and water coupled with 1,4-dioxane facilitated the lignin depolymerization significantly.

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Preparation of functionalized magnetic graphene oxide/lignin composite nanoparticles for adsorption of heavy metal ions and reuse as electromagnetic wave absorbers

Cited by 54 publications

References 81 publications

Ultrasound-assisted low-temperature catalytic lignin-first depolymerization of pine wood biomass to selectively produce propyl guaiacol

Ultrasound-assisted low-temperature catalytic lignin-first depolymerization of pine wood biomass to selectively produce propyl guaiacol

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

Efficient Lignin Depolymerization Process for Phenolic Products with Lignin-Based Catalysts and Mixed Solvents

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