One-step fabrication of β-cyclodextrin modified magnetic graphene oxide nanohybrids for adsorption of Pb(II), Cu(II) and methylene blue in aqueous solutions

Ma, Yan; Shao, Wenjie; Sun, Wen; Kou, Ya-Lan; Li, Xin; Yang, Haipeng

doi:10.1016/j.apsusc.2018.08.025

Cited by 115 publications

(26 citation statements)

References 52 publications

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“…The structure of the obtained materials was investigated using X-ray diffraction (XRD) and the results are shown in Figure 2. The narrow peaks in the XRD pattern of β-CD (ochre curve) that are due to crystalline β-CD [48,49], overlap with a broad peak that is related to the presence of an amorphous phase, which is possibly caused by the presence of crosslinked hexamethylene diisocyanate moieties. These peaks were not present in the pattern collected from Pd/CβCAT (grey curve), where the broad amorphous-phase peak was observed along with two less intense peaks in the 39 to 45 2Theta range.…”

Section: Resultsmentioning

confidence: 99%

“…In the β-CD DRIFT spectrum, the bands at 3298, 1684, 1547, and 1148 cm −1 correspond to the O–H stretching vibration, the C=O stretching of the carboxyl groups, the C–O stretching vibration, and the N–H bending vibration, respectively [49,51,52]. The bands observed at 1254 and 1027 cm −1 can be ascribed to the symmetric and antisymmetric glycosidic C–O–C vibrations in the ether groups [49,51,52]. The peaks at 2923 and 2853 cm −1 represent the -CH 2 symmetric and asymmetric stretching vibrations, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks at 2923 and 2853 cm −1 represent the -CH 2 symmetric and asymmetric stretching vibrations, respectively. The absorption band at 948 cm −1 can be assigned to the R-1,4-bond skeleton vibration of β-cyclodextrin [49]. The peak at 633 cm -1 is related to O–H bending (out-of-plane).…”

Section: Resultsmentioning

confidence: 99%

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Microwave-Assisted Dehydrogenative Cross Coupling Reactions in γ-valerolactone with a Reusable Pd/β-cyclodextrin Crosslinked Catalyst

et al. 2019

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Transition-metal mediated C–H bond activation and functionalization is one of the most straightforward and powerful tools in modern organic synthetic chemistry. Oxidative C–H/C–H coupling reactions between two (hetero)arenes under heterogeneous catalysis may be a valuable means for the production of a plethora of bi(hetero)aryls, and one that adheres to the increasing demand for atom-economic and sustainable chemistry. We have therefore developed a reusable heterogeneous catalytic system, which is based on Pd cross-linked β-cyclodextrin, to perform an efficient microwave-assisted oxidative C–H/C–H cross coupling process between benzothiazoles and methyl thiophene in the presence of green solvents.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Microwave-Assisted Dehydrogenative Cross Coupling Reactions in γ-valerolactone with a Reusable Pd/β-cyclodextrin Crosslinked Catalyst

et al. 2019

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“…Recently, graphene-based composites have been largely investigated as adsorption materials, which displayed excellent performances for adsorption of heavy metal ions, organic and dyes (Mi et al, 2012;Sitko et al, 2013;Yoon et al, 2016;Liu et al, 2018;Li et al, 2019). Notably, magnetic graphene oxide (GO) composites have been regarded as promising adsorbents for water purification because they could be easily separated from solution under an external magnetic field, thus overcoming the limitation of GO's difficult separation in solution (Chandra et al, 2010;He et al, 2010;Ma et al, 2018). However, GO sheets tend to restack, thus inevitably reducing their surface area and adsorption capacity (Bourlinos et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Regeneration of Fe3O4@Graphene Oxide Composites

Zhang

et al. 2020

Front. Chem.

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In this study, two kinds of composites with the structure of graphene oxide (GO) sheets wrapped magnetic nanoparticles were investigated on their regeneration. The composites have a similar core-shell structure, but the interactions between the core and shell are quite different, which are electrostatic and covalent. They were characterized by scanning/transmission electron microscopy, power X-ray diffraction, and vibrating sample magnetometer analysis. Their morphologies and structures of the samples had been revealed using methylene blue and Pb(II) as adsorbates during regeneration. The results showed that the composites with covalent bonding interaction could maintain a stable core-shell structure and present a good regeneration performance for adsorption-desorption of methylene blue and Pb(II). The composites with electrostatic interaction could approximately preserve its core-shell structure and could be recyclable for adsorption-desorption of methylene blue, however, they would disintegrate its core-shell structure during adsorption/desorption of Pb(II), thus greatly decreasing their regeneration performance. The regeneration mechanisms of the composites were analyzed, which could provide a useful theoretical guide to design the GO sheets wrapped magnetic nanoparticles composites.

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“…The photoinduced electrons and holes can reduce and oxidize species adsorbed on the semiconductors because of the band gap excitation, however, there is a disadvantage, which is the high degree of recombination between the photogenerated charge carriers [6]. Many studies have been focused on the mixed metal oxide semiconductors due to an efficient charge separation obtained by coupling two different semiconductors, which result in a vectorial transfer of photogenerated electrons and holes from a semiconductor to another [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and photocatalytic performance of hetero-structured CuO-ZnO loaded composite nanofiber membranes

Fang¹,

Yu²,

Xu³

2020

Preprint

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Owing to the nano-effect of nanofibers and special properties of semiconductor oxides, inorganic semiconductor oxides loaded composite nanofibers (CNFs) have been widely applied in environmental monitoring, industry, aviation, transportation and other fields. In this paper, the hetero-structured CuO-ZnO loaded CNF membranes (CNFMs) were prepared successfully by a combination of electrospinning technology, heat treatment and hydrothermal method. The effects of electrospinning, heat treatment and hydrothermal parameters on morphology, structure and properties of the CNFMs were investigated, and the optimal process parameters were determined. Then the hetero-structured CuO-ZnO loaded CNFMs obtained under the condition of the optimal process parameters were applied to photocatalytic degradation of methyl orange, and it was found the CNFMs could be reused to degrade methyl orange at least three times, and the degradation rate remained above 90%.

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One-step fabrication of β-cyclodextrin modified magnetic graphene oxide nanohybrids for adsorption of Pb(II), Cu(II) and methylene blue in aqueous solutions

Cited by 115 publications

References 52 publications

Microwave-Assisted Dehydrogenative Cross Coupling Reactions in γ-valerolactone with a Reusable Pd/β-cyclodextrin Crosslinked Catalyst

Microwave-Assisted Dehydrogenative Cross Coupling Reactions in γ-valerolactone with a Reusable Pd/β-cyclodextrin Crosslinked Catalyst

Comparative Study on the Regeneration of Fe3O4@Graphene Oxide Composites

Preparation, characterization and photocatalytic performance of hetero-structured CuO-ZnO loaded composite nanofiber membranes

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