Facile synthesis of N, P-doped carbon dots from maize starch <i>via</i> a solvothermal approach for the highly sensitive detection of Fe<sup>3+</sup>

Dong, Guohua; Lang, Kun; Ouyang, He; Zhang, Wenzhi; Bai, Liming; Chen, Shijie; Zhang, Zhuanfang; Gao, Yueyue; Mu, Zhonghua; Zhao, Xiaodan

doi:10.1039/d0ra06209j

Cited by 43 publications

(20 citation statements)

References 44 publications

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“…The intense and broad D band confirms the defective nature of N, P-CNOs. [25,26] It can be seen that the G peak center for the N, P-CNOs with nano-onion morphology has blue-shifted slightly compared to that of highly oriented pyrolytic graphite (HOPG) (1582 cm À 1 ), a similar trend is reported in the literature. [14,15,27] The blue-shifting of the G band is due to the tensile strain caused by the curvature of the graphene planes.…”

Section: Resultssupporting

confidence: 81%

“…The deconvoluted P2p spectra show two distinct peaks at 134.30 eV, and 135.08 eV, which indicate the PÀ C, and PÀ O bonds, respectively. [26,33] It can be inferred from the XPS data that the N, P-CNOs contain more aromatic carbons along with graphitic nitrogen and edge À NH 2 functional groups. The P-atoms are mostly on the surface and edge of the nano- onion structures.…”

Section: Resultsmentioning

confidence: 99%

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Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Kar

Bramhaiah

John

et al. 2021

Chemistry An Asian Journal

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Carbon dots (CDs) have become one of the most emerging materials as an alternative solar light-induced photocatalyst in contrast to traditional metal-based systems. However, one of the major challenges is the lack of visible light absorption. Herein, we have fabricated unique N, P-codoped CDs with a self-assembled onion-like layered structure by using a bottom-up facile synthesis technique from chitosan gel and phosphoric acid as molecular precursors. This typical layered structure of N, P-co-doped carbon nano onions (N, P-CNOs), with an average size of 25-50 nm, displays an enhanced visible light absorption. Detailed structural and elemental characterizations confirm the extensive aromatic domain with P-containing surface functionalities, while electrochemical study clarifies the lowering of band gaps as well as the creation of new electronic states in comparison to the pristine N-CDs. Furthermore, the intrinsic structural features are correlated with the underpinning photophysical processes by steady-state and time-resolved fluorescence spectroscopy. In addition, steady-state polarized emission and thermo-responsive PL properties have been carried out to unveil further the structure-property correlation of N, P-CNOs, and their comparative study with pristine N-CDs at the different excitation wavelengths. Finally, N, P-CNOs exhibit efficient visible-light-induced photocatalysis, and the detailed mechanistic study is carried out by trapping the photogenerated species in an aqueous medium. The prepared N, P-CNOs displayed an excellent visible-light photocatalytic performance over MB dye with a degradation efficiency of 75.8% within 120 min along with a degradation rate constant of~0.0109 min À 1 . It is concluded that the easy to synthesize and low-cost N, P-CNOs with a unique morphology hold great potential for application in visiblelight photocatalysis.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Kar

Bramhaiah

John

et al. 2021

Chemistry An Asian Journal

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“…The calculation results show that the average size of BCD in this study is 8.36 nm, which corresponds to the size of the carbon dots, which is below 10 nm. 6,38 Therefore, BCD is promisingly quali-ed to ow in tissue circulation organs. 32…”

Section: Resultsmentioning

confidence: 99%

Naproxen release aspect from boron-doped carbon nanodots as a bifunctional agent in cancer therapy

et al. 2021

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“…The LOD is determined to be 216 nM/L based on the 3:3 σ/K equation, where σ is the standard deviation and K is the slope of the calibration curve. The obtained LOD is significantly less compared to that of permissible levels of WHO for Fe 3+ in water (5.36 μmol L -1 ) [41] and many recent papers (Table S3 of supplementary information). The current observation signifies the use of synthesized NCDs to detect Fe 3+ with high selectivity and sensitivity.…”

Section: Selectivity Of Ncds Towards Fe 3+ Ionsmentioning

confidence: 66%

N-Doped Carbon Dots Derived from Melamine and Triethanolamine for Selective Sensing of Fe3+ Ions

Munusamy

Sawminathan

Arumugham

et al. 2021

Journal of Nanomaterials

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This work reports nitrogen-doped carbon dots (NCDs) as a selective sensing probe to detect Fe3+ in water samples. NCD probes were synthesized via solvothermal method using nitrogen-rich melamine and triethanolamine as precursors. Properties of the resulting NCDs were studied using different characterization techniques, through which N-doping was confirmed. The quantum yield of obtained NCDs was measured to be 21%. When excited at 370 nm, the excellent blue emission property makes this probe adoptable for selectively sensing Fe3+ in practical water samples. The limit of detection (LOD) was identified as 216 nM with a good linear range between the concentrations of 0.2-2 μM. The obtained LOD is far less than the World Health Organization (WHO) permissible limits of Fe3+ in water. Interference studies reveal that the presence of other competing ions did not alter the sensing of Fe3+, even at the presence of 10 equivalents which indicates the high selectivity of NCDs towards Fe3+. The reversibility studies showed that adding a cheap and readily available EDTA ligand to the NCD results in fluorescence regeneration, leading to exceptional reusability for the detection of Fe3+. So, the synthesized NCDs can be used as a suitable probe for the selective determination of Fe3+ in real water samples.

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Facile synthesis of N, P-doped carbon dots from maize starch via a solvothermal approach for the highly sensitive detection of Fe³⁺

Abstract: Nitrogen/phosphorus-doped carbon dots (N, P-CDs) with a quantum yield as high as 76.5% were synthesized by carbonizing maize starch via a facile ethanol solvothermal approach and utilized for the detection of Fe3+.

Cited by 43 publications

References 44 publications

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Naproxen release aspect from boron-doped carbon nanodots as a bifunctional agent in cancer therapy

N-Doped Carbon Dots Derived from Melamine and Triethanolamine for Selective Sensing of Fe3+ Ions

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Facile synthesis of N, P-doped carbon dots from maize starch via a solvothermal approach for the highly sensitive detection of Fe3+

Abstract: Nitrogen/phosphorus-doped carbon dots (N, P-CDs) with a quantum yield as high as 76.5% were synthesized by carbonizing maize starch via a facile ethanol solvothermal approach and utilized for the detection of Fe3+.

Cited by 43 publications

References 44 publications

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Naproxen release aspect from boron-doped carbon nanodots as a bifunctional agent in cancer therapy

N-Doped Carbon Dots Derived from Melamine and Triethanolamine for Selective Sensing of Fe3+ Ions

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Facile synthesis of N, P-doped carbon dots from maize starch via a solvothermal approach for the highly sensitive detection of Fe³⁺