Nitrogen and sulfur co-doped fluorescent carbon dots for the trapping of Hg(<scp>ii</scp>) ions from water

Kaur, Harpreet; Kaur, Navneet; Singh, Narinder

doi:10.1039/d0ma00448k

Cited by 12 publications

(5 citation statements)

References 65 publications

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“…Furthermore, the strength of the interaction between FeCl 3 and Bf was calculated using the Benesi–Hildebrand relation (1) and was found to be 0.632 × 10 5 M –1 , indicating excellent binding affinity of the metal salt toward Bf, as shown in Figure S6 log false( A − A o false) false( A f − A o false) = log false[ F e false] + log ⁡ K b A 0 , A, and A f are the absorption values in the absence of ferric ion, at the intermediate level of ferric ion concentration, and at the saturation of the ferric ion, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of Earth-Abundant Metal Salts for the Inhibition of Asphalt-Derived Volatile Organic Compounds

Kaur,

Nsouli,

Cerna

et al. 2024

ACS Omega

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Asphalt is used globally in construction for roads, pavements, and buildings; however, as a fossil-derived material, it is known to generate volatile organic compounds (VOCs) upon exposure to heat and light that can be harmful to human health. Several heterogeneous strategies have been reported for the inhibition of these VOCs; however, the direct use of inexpensive, accessible Earth-Abundant metals has not been extensively explored. In this study, simple metal salts are examined for their coordination capability toward asphalt-derived VOCs. From UV–visible (UV–vis) spectroscopic studies, FeCl3 emerged relative to other metal salts (metal = Mn, Co, Ni, Cu, Zn) as a promising candidate for the adsorption and retention of Lewis basic compounds. Coordination of an example oxygen-containing VOC, benzofuran (Bf), to Fe yielded a paramagnetic semi-octahedral complex Fe(Bf)3Cl3. Evaluation by thermal gravimetric analysis (TGA) coupled to infrared spectroscopy (IR) demonstrated that the complex was stable up to 360 °C. Spectroscopic evaluation demonstrated the stability of the complex upon visible light irradiation and in the presence of a variety of organic pollutants. The potential application of Fe was demonstrated by subjecting biochar to FeCl3 followed by the addition of Bf. It was discovered that this Fe-rich biochar was successful at adsorbing Bf suggesting the possibility of introducing Fe to biochar late-stage in processing to deter asphalt degradation and VOC emissions. An understanding of the binding and stability of Fe salts to VOCs provides insight into how a sustainable infrastructure can be achieved.

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Section: Resultsmentioning

confidence: 99%

“…Furthermore, the strength of the interaction between FeCl 3 and Bf was calculated using the Benesi−Hildebrand relation (1) and was found to be 0.632 × 10 5 M −1 , indicating excellent binding affinity of the metal salt toward Bf, as shown in Figure S6. 32…”

Section: Figure 5 (A)mentioning

confidence: 99%

Investigation of Earth-Abundant Metal Salts for the Inhibition of Asphalt-Derived Volatile Organic Compounds

Kaur,

Nsouli,

Cerna

et al. 2024

ACS Omega

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“…UV–vis spectra were observed from 200 to 800 nm for all the samples. A calibration plot was obtained with known concentrations of the VOC, which were analyzed spectroscopically. , Linear regression coefficients of 0.98986, 0.98345, and 0.99944 were observed for benzofuran, benzoic acid, and dibenzothiophene, respectively. The concentration of the remaining VOC in the solution after binding was calculated using these calibration plots, and the percentage of VOC adsorbed per 10 mg of the biochar was then calculated.…”

Section: Methodsmentioning

confidence: 99%

Efficiency of Metal-Incorporated Carbonaceous Adsorbents in the Presence of Phenolic Compounds

Mousavi,

Kaur,

Ackerman-Biegasiewicz

et al. 2024

ACS Appl. Eng. Mater.

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This paper investigates the role of phenolic compounds in biochar's adsorption capacity toward volatile organic compounds (VOCs) emitted from asphalt. Considering the impact of the preparation technique on biochar's composition, our findings show that the biochar produced through the fixed-bed technique contained more functional groups than the biochar produced through the fluidized-bed technique. Specifically, Fourier transform infrared analysis showed a higher concentration of phenolic OH groups in fixed-bed biochar, consistent with its nearly 3-fold higher oxygen content (6.37 ± 0.52 wt %) compared to fluidized-bed biochar (2.36 ± 0.54 wt %). Additionally, fixed-bed biochar contains significant concentrations of inorganic elements, such as Ca (8.103 g/kg), Al (6.904 g/kg), K (6.365 g/kg), and Fe (4.397 g/kg). Our density functional theory (DFT)-based molecular modeling revealed that phenolic groups directly influence the interaction of metal sites on biochar with the VOCs, benzoic acid, benzofuran, and dibenzothiophene. Consequently, the biochar model surface containing phenolic OH groups outperforms VOC adsorption compared with the pristine biochar surface lacking any phenolic OH groups. DFT results were validated by using UV−vis absorption studies, which demonstrated that phenolic OH-rich biochar was able to adsorb higher concentrations of benzofuran, benzoic acid, and dibenzothiophene. In addition, thermogravimetric analysis confirmed the biochar's ability to adsorb VOCs and retain them even under high temperatures. The study outcomes provide insight into the role of phenolic functional groups in the performance of the biochar in VOC adsorption. This in turn promotes the use of biochar in asphalt as a means of sequestering anthropogenic CO 2 and reducing the emission of VOCs.

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“…It was found that the fluorescence intensity of the as‐synthesized CDs can be absolutely quenched in the presence of Hg 2+ ions because of the electron/energy transfer process between the surface functional groups of the CDs and soft closed‐shell Hg 2+ ions. The proposed nanosensor can detect Hg 2+ ions in aqueous media with a detection limit of about 7.89 nM with high selectivity, sensitivity, and relatively low background interference even in complex media [59] …”

Section: Sensing Of Specific Ions Containing Metalsmentioning

confidence: 99%

Design of Fluorescent Carbon Dots (CDs) for the Selective detection of Metal‐Containing Ions

López‐Beltrán

Iriarte‐Mesa²,

Murru

et al. 2023

Chemistry A European J

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The pollution caused by heavy metals (HMs) may occur through both natural processes and anthropogenic activities and is found in complex media. The purpose of this review is to summarize the state-of-art of fluorescent CDs and the sensing applications in a systematic manner. This review intends to provide clues on the origin on the observed selectivity in chemiluminiscence sensors, which was until now a stated but unaddressed question, and still remains open for debate. Indeed, it is tempting to think that CDs possessing functional groups with soft bases at the surface are able to detect soft metal acids, while the opposite is to be suspected for hard acid-base pairs. However, the literature shows several examples where this trend does not hold. We found that such observation is explained by the involvement of dynamic quenching, which does not involve the formation of a nonfluorescent complex, as in the case of static quenching. We have provided an interpretation of published data that was not provided by the original authors and offer guidelines to enable the design of CDs to target ions in solution.

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Nitrogen and sulfur co-doped fluorescent carbon dots for the trapping of Hg(ii) ions from water

Abstract: An unsophisticated, reliable and ultrasensitive fluorescent sensor motif based on Carbon Dots (CDs) co-doped with nitrogen and sulfur atoms has been fabricated using calix[4]arene and benzothiazole moieties for the recognitionof...

Cited by 12 publications

References 65 publications

Investigation of Earth-Abundant Metal Salts for the Inhibition of Asphalt-Derived Volatile Organic Compounds

Investigation of Earth-Abundant Metal Salts for the Inhibition of Asphalt-Derived Volatile Organic Compounds

Efficiency of Metal-Incorporated Carbonaceous Adsorbents in the Presence of Phenolic Compounds

Design of Fluorescent Carbon Dots (CDs) for the Selective detection of Metal‐Containing Ions

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