Carboxyl and negative charge-functionalized superparamagnetic nanochains with amorphous carbon shell and magnetic core: synthesis and their application in removal of heavy metal ions

Wang, Hui; Chen, Qianwang; Chen, Jian; Yu, Binxing; Hu, Xiaojun

doi:10.1039/c1nr11012h

Cited by 38 publications

(20 citation statements)

References 38 publications

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“…19‐0629). The strongest diffraction peak at 35.73° is attributed to the (311) crystal plane, and the other representative peaks at around 30.40°, 37.23°, 43.17°, 54.56°, 57.34°, and 62.77° are assigned to the (220), (222), (400), (422), (511), and (440) crystal planes of Fe 3 O 4 , respectively . These peaks are closely consistent with the SAED results.…”

Section: Resultssupporting

confidence: 87%

Nitrogen‐Doped Carbon Quantum Dot Stabilized Magnetic Iron Oxide Nanoprobe for Fluorescence, Magnetic Resonance, and Computed Tomography Triple‐Modal In Vivo Bioimaging

Liu

Jiang

et al. 2016

Adv Funct Materials

122

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Multimodal imaging, which combines complementary information of two or more imaging modalities, offers huge advantages. In this paper, the synthesis, characterization, and application of superparamagnetic nitrogen-doped carbon-iron oxide hybrid quantum dots (C-Fe 3 O 4 QDs) is reported for triple-modal bioimaging through fluorescence/magnetic resonance/computed tomography (FL/MR/CT). Especially, C-Fe 3 O 4 QDs are synthesized by using poly (γ-glutamic acid) as a precursor and stabilizer via a green and facile one-pot hydrothermal approach. The as-prepared C-Fe 3 O 4 QDs exhibit excellent water dispersibility, wavelength-tunable FL property with high quantum yield of about 21.6%, good photostability, strong superparamagnetic property as well as favorable biocompatibility. Meanwhile, these C-Fe 3 O 4 QDs also show a transverse relaxivity value (r 2 ) of 154.10 mm −1 s −1 for T 2 -weighted MR imaging mode and an observable X-ray attenuation effect for CT imaging mode. Moreover, the in vivo bioimaging of tumor-bearing nude mice by combining FL, MR, and CT images further demonstrates that the as-prepared C-Fe 3 O 4 QDs can be readily and efficiently used in FL/MR/CT triple-modal tumor imaging. Hence, the new and facile one-pot synthesis strategy for preparing multifunctional C-Fe 3 O 4 QDs nanoprobes provides a convenient way for achieving an effective and versatile agent for tumorous bioimaging/or diagnostics.

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Section: Resultssupporting

confidence: 87%

Nitrogen‐Doped Carbon Quantum Dot Stabilized Magnetic Iron Oxide Nanoprobe for Fluorescence, Magnetic Resonance, and Computed Tomography Triple‐Modal In Vivo Bioimaging

Liu

Jiang

et al. 2016

Adv Funct Materials

122

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Section: Functionalizationmentioning

confidence: 93%

“…Therefore, this indicates the increase of the carboxyl groups, which are responsible for making the nanocomposites more acidic. The presence of carboxyl groups in nanocomposites is ascribed to the enhancement of their colloidal stability and monodispersibility in aqueous solutions [33]. In addition to the incorporation of oxygen-groups on the carbon-based shell by using nitric acid, another functionalization was performed using Pluronic ® F-68 to enhance the colloidal stability of the nanocomposites in aqueous salty medium.…”

Section: Functionalizationmentioning

confidence: 99%

Carbon-Based Magnetic Nanocarrier for Controlled Drug Release: A Green Synthesis Approach

Oliveira

Rodrigues

Barros

et al. 2018

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In this study, hydrophilic magnetic nanoparticles were synthesized by green routes using a methanolic extract of Rubus ulmifolius Schott flowers. The prepared magnetic nanoparticles were coated with carbon-based shell for drug delivery application. The nanocomposites were further chemically functionalized with nitric acid and, sequentially, with Pluronic® F68 (CMNPs-plur) to enhance their colloidal stability. The resulting material was dispersed in phosphate buffer solution at pH 7.4 to study the Doxorubicin loading. After shaking for 48 h, 99.13% of the drug was loaded by the nanocomposites. Subsequently, the drug release was studied in different working phosphate buffer solutions (i.e., PB pH 4.5, pH 6.0 and pH 7.4) to determine the efficiency of the synthesized material for drug delivery as pH-dependent drug nanocarrier. The results have shown a drug release quantity 18% higher in mimicking tumor environment than in the physiological one. Therefore, this study demonstrates the ability of CMNPs-plur to release a drug with pH dependence, which could be used in the future for the treatment of cancer "in situ" by means of controlled drug release.

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“…The application of a simple magnetic field is sufficient to collect them, which fosters the development of low-cost recyclable processes. However, while many systems can efficiently remove hazardous metallic ions from waters, the elimination of organic micropollutants is still an issue [11,14]. Most of the materials are exclusively efficient for cationic or anionic molecules, and only few of them have been successfully tested on both [15].…”

Section: Introductionmentioning

confidence: 99%

An efficient recyclable magnetic material for the selective removal of organic pollutants

Monteil¹,

Bar²,

Bée³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryWastewater cleaning strategies based on the adsorption of materials are being increasingly considered, but the wide variety of organic pollutants at low concentrations still makes their removal a challenge. The hybrid material proposed here consists of a zwitterionic polyethylenimine polymer coating a magnetic core. Polyethylenimine is phosphonated at different percentages by a one-step process and used to coat maghemite nanoparticles. It selectively extracts high amounts of cationic and anionic contaminants over a wide range of pH values, depending on the adjustable number of phosphonate groups introduced on the polymer. After recovering the nanoparticles with a magnet, pollutants are quantitatively released by repeated washing with low amounts of pH-adjusted water. The material can be reused many times without noticeable loss of efficiency and is designed to resist high temperatures, oxidation and harsh conditions.

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Carboxyl and negative charge-functionalized superparamagnetic nanochains with amorphous carbon shell and magnetic core: synthesis and their application in removal of heavy metal ions

Cited by 38 publications

References 38 publications

Nitrogen‐Doped Carbon Quantum Dot Stabilized Magnetic Iron Oxide Nanoprobe for Fluorescence, Magnetic Resonance, and Computed Tomography Triple‐Modal In Vivo Bioimaging

Nitrogen‐Doped Carbon Quantum Dot Stabilized Magnetic Iron Oxide Nanoprobe for Fluorescence, Magnetic Resonance, and Computed Tomography Triple‐Modal In Vivo Bioimaging

Carbon-Based Magnetic Nanocarrier for Controlled Drug Release: A Green Synthesis Approach

An efficient recyclable magnetic material for the selective removal of organic pollutants

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