Sensitive detection of Au(III) using regenerative rhodamine B–functionalized chitosan nanoparticles

Liu, Jinshui; Liu, Wenxiu; Xu, Meijiao; Wang, Bin; Zhou, Zihan; Wang, Lizhen

doi:10.1016/j.snb.2016.04.086

Cited by 17 publications

(9 citation statements)

References 42 publications

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“…The imidazolium hydrogens (NCHN−) in POSS-1 are found at 9.09 ppm, and this peak disappears in POSS-2, indicating the successful formation of imidazole thione. This finding can be also verified by the 13 C NMR spectra (Figure S1) in which the peak assigned to the imidazolium carbons ( NCHN−) in POSS-1 is observed at 136.7 ppm and a new peak assigned to the formed CS is observed at 159.8 ppm. As expected, two single peaks are observed at −66.7 and −67.1 ppm for POSS-1 and POSS-2, respectively, in the 29 Si NMR spectra (Figure S2).…”

Section: ■ Results and Discussionsupporting

confidence: 68%

“…POSS-1 and POSS-2 were fully characterized by FT-IR, 1 H NMR, 13 C NMR, 29 Si NMR, and elemental analysis. In the IR spectra (Figure 1a), the peaks from 1596 to 1433 cm −1 are attributable to the CN or CC stretching vibrations from imidazolium groups in POSS-1.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Numerous Au(III) adsorbents have been presented with a maximum adsorption capacity of up to 3257.3 mg/g. − However, most reports focus on one aspect, that is, detection or recovery of Au(III). Few of them have aimed at the materials involving simultaneous detection by fluorometry and recovery by adsorption of Au(III), probably because it is difficult to balance these two functions. − In other words, it is difficult to efficiently recover Au(III) in Au(III) probes with high detection efficiencies due to the lack of adsorbable functional groups, or Au(III) adsorbents with high recovery efficiencies are not suitable for detection due to the lack of fluorescence sensitivity. Developing dual-function materials toward simultaneous Au(III) detection and recovery with high sensitivity, selectivity, and recovery efficiency is still highly desirable.…”

Section: Introductionmentioning

confidence: 99%

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An Imidazole Thione-Modified Polyhedral Oligomeric Silsesquioxane for Selective Detection and Adsorptive Recovery of Au(III) from Aqueous Solutions

Chen

Wang

Feng

et al. 2021

ACS Appl. Mater. Interfaces

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Developing a material toward simultaneous detection and recovery of gold ions (Au(III)) is highly desirable for the economy and the environment. Herein, we report a highly efficient dual-function material for simultaneous Au(III) detection and recovery by simply introducing abundant imidazole thione and thioether groups in one system. This material, that is, an imidazole thione-modified polyhedral oligomeric silsesquioxane (POSS-2), was prepared by a mild reaction of an imidazolium-containing POSS and sulfur at ambient temperature. The POSS-2 suspension in water can rapidly and selectively detect Au(III) with a very low limit of detection of 1.2 ppb by fluorescence quenching or a visualized color change from white to dark orange. POSS-2 can also selectively and efficiently capture Au(III) with a maximum adsorption uptake of 1486.5 mg/g. The adsorption process well fits with the pseudo-second-order kinetic and Langmuir models. The intriguing dual-function performance is better than most of the previous Au(III) probes or adsorbents. The mechanism study reveals that the detection and adsorption behavior are mainly caused by the redox reaction and coordination between imidazole thione and thioether groups and Au(III). Furthermore, POSS-2 was successfully utilized to extract gold without interference from a discard CPU. These results indicate the potential application of the present dual-function material for Au(III) detection and recovery from aqueous solutions. More dual-functional materials could be designed and prepared by this simple strategy.

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Section: ■ Results and Discussionsupporting

confidence: 68%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Imidazole Thione-Modified Polyhedral Oligomeric Silsesquioxane for Selective Detection and Adsorptive Recovery of Au(III) from Aqueous Solutions

Chen

Wang

Feng

et al. 2021

ACS Appl. Mater. Interfaces

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“…A traditional colorimetric assay is currently used to determine β-glucosidase activity because the assay is simple and practical, but the inherent drawbacks of colorimetric methods limit the sensitivity of the assay . Fluorescence assays offer advantages such as rapid responses, good sensitivities, and simple sample manipulation requirements that have caused them to receive increasing attention in recent years. , Several fluorometric assays for determining β-glucosidase activity have been developed. These assays involve fluorogenic substrates, but these organic dye substrates are complicated to synthesize and are poorly soluble in aqueous systems. , It is therefore desirable to develop new fluorescent strategies that involve simple preparative methods and offer good performances when determining β-glucosidase activity.…”

Section: Introductionmentioning

confidence: 99%

“…11 Fluorescence assays offer advantages such as rapid responses, good sensitivities, and simple sample manipulation requirements that have caused them to receive increasing attention in recent years. 13,14 Several fluorometric assays for determining β-glucosidase activity have been developed. These assays involve fluorogenic substrates, but these organic dye substrates are complicated to synthesize and are poorly soluble in aqueous systems.…”

Section: ■ Introductionmentioning

confidence: 99%

“Turn-On” Fluorescence Determination of β-Glucosidase Activity Using Fluorescent Polymer Nanoparticles Formed from Polyethylenimine Cross-Linked with Hydroquinone

Liu

Bao

Liu

et al. 2019

ACS Appl. Polym. Mater.

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β-Glucosidase is associated with many diseases, so it is important to be able to accurately determine β-glucosidase activity. Here, we describe a turn-on fluorescence method for sensitively determining β-glucosidase activity. The method involves the formation of water-soluble fluorescent polymer nanoparticles. β-Glucosidase initially hydrolyzes the β-arbutin substrate to release hydroquinone (1,4-dihydroxybenzene). The hydroquinone then forms cross-links between branched polyethylenimine molecules to give fluorescent water-soluble polymer nanoparticles. The polymer nanoparticles were found to fluoresce with excitation and emission peaks at 373 and 510 nm, respectively, and the fluorescence intensity was related to the β-glucosidase activity. The fluorescence intensity could therefore be used to determine the β-glucosidase activity. The lowest β-glucosidase activity that could be determined was 0.4 U L–1, and the dynamic linear range was 1.0–36.0 U L–1. The method was very selective for β-glucosidase activity and was not sensitive to other proteins. The method was successfully used to determine β-glucosidase in spiked samples containing human serum albumin at a concentration of 0.5%, and the recoveries were 95.2%–104.5%.

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Colorimetric and visual determination of Au(III) ions using PEGylated gold nanoparticles

et al. 2018

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A highly selective method is described for the colorimetric determination of Au(III) ions in acidic solution using gold nanoparticles (AuNPs) functionalized with thiolated methoxy poly(ethylene glycol) (mPEG). The presence of Au(III) induces the aggregation of the PEG-AuNPs, and this is accompanied by a color change from wine red to blue, and a decrease in absorbance at 525 nm. This can be monitored spectrophotometrically and visually. Absorbance at 525 nm linearly drops in the 0.50 to 1.75 mg·L Au(III) concentration range, with a 0.25 mg·L detection limit. The method is surprisingly selective over other metal ions. It was successfully applied to the analysis of ore samples. Graphical Abstract ᅟ.

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Sensitive detection of Au(III) using regenerative rhodamine B–functionalized chitosan nanoparticles

Cited by 17 publications

References 42 publications

An Imidazole Thione-Modified Polyhedral Oligomeric Silsesquioxane for Selective Detection and Adsorptive Recovery of Au(III) from Aqueous Solutions

An Imidazole Thione-Modified Polyhedral Oligomeric Silsesquioxane for Selective Detection and Adsorptive Recovery of Au(III) from Aqueous Solutions

“Turn-On” Fluorescence Determination of β-Glucosidase Activity Using Fluorescent Polymer Nanoparticles Formed from Polyethylenimine Cross-Linked with Hydroquinone

Colorimetric and visual determination of Au(III) ions using PEGylated gold nanoparticles

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