Phosphoric acid assisted synthesis of fluorescent carbon dots from waste biomass for detection of Cr(VI) in aqueous media

Goswami, Juri; Rohman, Shahnaz S.; Guha, Ankur Kanti; Basyach, Purashri; Sonowal, Karanika; Borah, Shashwata Pratim; Saikia, Lakshi; Hazarika, Parasa

doi:10.1016/j.matchemphys.2022.126133

Cited by 40 publications

(19 citation statements)

References 56 publications

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“…The high-resolution XPS spectra of C 1s, O 1s, and N 1s are shown in Figure b–d. It is found that there are three peaks at ∼284 eV, corresponding to C–C/CC, C–O, and CO, respectively . Interestingly, the intensity of C–C/CC peaks increases with the decrease of the boiling point, and the C–C/CC peaks of BCD3 show the highest intensity according to the largest particle size, which further proves the largest size of sp 2 conjugation.…”

Section: Resultsmentioning

confidence: 77%

“…It is found that there are three peaks at ∼284 eV, corresponding to C–C/C=C, C–O, and C=O, respectively. 23 Interestingly, the intensity of C–C/C=C peaks increases with the decrease of the boiling point, and the C–C/C=C peaks of BCD3 show the highest intensity according to the largest particle size, which further proves the largest size of sp 2 conjugation. Similarly, the boiling point of the reaction solvent also has effects on the O and N contents.…”

Section: Resultsmentioning

confidence: 80%

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Preparation of Multicolor Biomass Carbon Dots Based on Solvent Control and Their Application in Cr(VI) Detection and Advanced Anti-Counterfeiting

et al. 2023

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Multicolor fluorescent carbon dots (CDs) have received widespread attention due to their excellent fluorescence performance and promising prospects in anti-counterfeiting and sensing detection. To date, most of the multicolor CDs synthesized are derived from chemical reagents; however, the overuse of chemical reagents during the synthesis process will pollute the environment and limit their application. Herein, multicolor fluorescent biomass CDs (BCDs) were prepared by a one-pot ecofriendly solvothermal method, with spinach as the raw material based on solvent control. The as-obtained BCDs can emit blue, crimson, grayish white, and red luminescence, and their quantum yields (QYs) are 8.9, 12.3, 10.8, and 14.4%, respectively. The results of the characterization of BCDs reveal that the regulating mechanism for multicolor luminescence is mainly ascribed to the change of the boiling point and polarity of solvents, which changes the carbonization process of polysaccharides and chlorophyll in spinach, resulting in the altered particle size, surface functional groups, and porphyrin luminescence properties. Further research reveals that blue BCDs (BCD1) show an excellent sensitive and selective response to Cr(VI) in a concentration scale of 0–220 μM with a detection limit (LOD) of 0.242 μM. More importantly, the intraday and interday relative standard deviation (RSD) values were less than 2.99%. The recovery rate of the Cr(VI) sensor for tap water and river water is 101.52–107.51%, which indicates that the sensor has the advantages of high sensitivity, selectivity, rapidity, and reproducibility. Consequently, different multicolor patterns are obtained by using the obtained four BCDs as fluorescent inks, which exhibit beautiful landscape and advanced anti-counterfeiting effects. This study provides a low-cost and facile green synthesis strategy for multicolor luminescent BCDs and proves that BCDs have broad application prospects in ion detection and advanced anti-counterfeiting.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 80%

Preparation of Multicolor Biomass Carbon Dots Based on Solvent Control and Their Application in Cr(VI) Detection and Advanced Anti-Counterfeiting

et al. 2023

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“…As displayed in Table S1, the proposed approach exhibited a wide linear range. [14,[46][47][48][49][50][51] 3. FRET quenching mechanism.…”

Section: Ph Effects On the Fluorescence Intensity Of F-acmentioning

confidence: 99%

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Guo

Shi

et al. 2022

Luminescence

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Here, we developed a facile one-pot strategy for the fabrication of fluorescent aminoclay (F-AC) through in situ solvothermal treatment of 3-aminopropyltrimethoxysilane, MgCl 2 , and sodium ascorbate at 180 C for 6 h. The obtained F-AC exhibited blue emission, good water solubility, and satisfactory photostability. It was observed that Cr 2 O 7 2À could selectively quench the fluorescence of F-AC through the inner filter effect and static quenching process.As a result, a novel fluorescent F-AC-based nanosensor was constructed with good linearity in the range 0.1-75 μM. The nanosensor was successfully applied in real water samples with satisfactory results. This work not only provides a novel nanosensor for Cr 2 O 7 2À , but also highlights the F-AC's promising applications in wider fields due to the versatility and simplicity of the preparation strategy.applications, Cr 2 O 7 2À , fluorescent aminoclay, fluorescent detection, one-pot synthesis | INTRODUCTIONHexavalent chromium (Cr(VI)) is widely used in many fields including electroplating, organic synthesis, leather tanning, textile dying, printing, steel manufacturing, etc. [1][2][3] However, Cr(VI) exhibits highly harmful, teratogenic, and potentially carcinogenic effects on living systems. Low concentrations of Cr(VI) may contribute to kidney failure and rhinitis. [4] The long-term intake of Cr(VI) can damage the DNA of organisms and induce lung adenocarcinoma, respiratory system damage, genetic defects, and so on. [5,6] Importantly, Cr(VI) in water or soil can be enriched in crops and the human body via the food chain, directly or indirectly leading to dangerous effects on human health and the environment. [7] Therefore, the detection of Cr(VI) is of great significance.To date, various approaches have been developed for sensing Cr(VI), [3] such as atomic absorption spectrum, [8] inductively coupled plasma mass spectrum (ICP-MS), [9] electrochemical methods, [10,11] ion chromatography, [12] colorimetry, [13] fluorescence, [6,14] and so on. Among these detection strategies, these traditional instrumental methods suffer from complicated operation and high costs. In contrast, optical methods including colorimetry and fluorescence provide simple, facile approaches for sensing Cr(VI) due to their simple operation and fast response. We prepared yellow-emissive nitrogen and boron-doped carbon quantum dots, and the prepared carbon quantum dots were successfully applied for fluorescence detection of Cr(VI). [6] Chen and co-workers presented a fluorescence enhancement method for sensing Cr(VI) using N-and S-doped carbon dots. [14] Tannic acid-stabilized fluorescent copper nanoclusters have been synthesized for fluorescence turn-off detection of Cr(VI) with a linear range 0.03-60 μM. [15] These methods provide promising paths for sensing Cr(VI). However, novel detection systems for sensing Cr(VI) are still required.Fluorescent aminoclay (F-AC) is a new type of fluorescent nanomaterial that has attracted considerable attention due to its unique optical properties, easy f...

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“…The use of up-conversion materials as electron mediators proves to be a successful method for suppressing photoinduced charge carrier recombination. 38 Furthermore, nitrogen-doped carbon quantum dots (N-CQDs) are regarded as effective electron mediators in various heterostructures due to their superior electron transport and storage features. 39 N-CQD-modified g-C 3 N 4 has recently been found to have enhanced photocatalytic activity for degrading dyes and phenols and water splitting.…”

Section: Introductionmentioning

confidence: 99%

Boosting the photodegradation of rhodamine B with the CuWO₄/g-C₃N₄ heterojunction by introducing biomass derived N-CQDs as an electron mediator: mechanism and DFT calculations

Goswami,

Basyach,

Purkayastha

et al. 2023

New J. Chem.

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Phosphoric acid assisted synthesis of fluorescent carbon dots from waste biomass for detection of Cr(VI) in aqueous media

Cited by 40 publications

References 56 publications

Preparation of Multicolor Biomass Carbon Dots Based on Solvent Control and Their Application in Cr(VI) Detection and Advanced Anti-Counterfeiting

Preparation of Multicolor Biomass Carbon Dots Based on Solvent Control and Their Application in Cr(VI) Detection and Advanced Anti-Counterfeiting

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Boosting the photodegradation of rhodamine B with the CuWO₄/g-C₃N₄ heterojunction by introducing biomass derived N-CQDs as an electron mediator: mechanism and DFT calculations

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Phosphoric acid assisted synthesis of fluorescent carbon dots from waste biomass for detection of Cr(VI) in aqueous media

Cited by 40 publications

References 56 publications

Preparation of Multicolor Biomass Carbon Dots Based on Solvent Control and Their Application in Cr(VI) Detection and Advanced Anti-Counterfeiting

Preparation of Multicolor Biomass Carbon Dots Based on Solvent Control and Their Application in Cr(VI) Detection and Advanced Anti-Counterfeiting

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr2O72−

Boosting the photodegradation of rhodamine B with the CuWO4/g-C3N4 heterojunction by introducing biomass derived N-CQDs as an electron mediator: mechanism and DFT calculations

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Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Boosting the photodegradation of rhodamine B with the CuWO₄/g-C₃N₄ heterojunction by introducing biomass derived N-CQDs as an electron mediator: mechanism and DFT calculations