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Chen ZY, Ji TH, Xu ZM, Guan P, Jv DJ. Hydrothermally activated TiO 2 nanoparticles with a C-dot/g-C 3N 4 heterostructure for photocatalytic enhancement. NANOSCALE ADVANCES 2021; 3:4089-4097. [PMID: 36132837 PMCID: PMC9419518 DOI: 10.1039/d1na00213a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/23/2021] [Indexed: 05/26/2023]
Abstract
Dye degradation via photocatalysis technology has been investigated intensively to tackle environmental issues and energy crisis concerns. In this study, a newly designed ternary photocatalyst was facilely prepared by a simple one-pot hydrothermal process by directly mixing TiO2 nanoparticles with carbon dots (C-dots) and graphitic carbon nitride (g-C3N4). The optimized precursor treatments and heterostructure components show significantly enhanced photodegradation activity towards organic dyes Rhodamine B (RhB) and methylene blue (MB). Excellent photocatalytic activities were achieved owing to the better attachment of anatase-type TiO2 nanoparticle-aggregations to the C-dots/g-C3N4 (CC) nanocomposite, which impressively displays superhydrophilicity by employing the hydrothermal activation process. FT-IR spectra revealed that the hydrothermal treatment could remarkably increase the coupling interactions between TiO2 nanoparticles and the CC nanosheets within the ternary catalyst, enhancing the photocatalytic activity. Thus, it was concluded that this ternary photocatalyst is highly suitable for the remediation of dye-contaminated wastewater.
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Affiliation(s)
- Zhong-Yi Chen
- Chemistry and Material Engineering College, Beijing Technology and Business University Beijing 100048 China
| | - Tian-Hao Ji
- Chemistry and Material Engineering College, Beijing Technology and Business University Beijing 100048 China
| | - Zhe-Mi Xu
- Chemistry and Material Engineering College, Beijing Technology and Business University Beijing 100048 China
| | - Peiyuan Guan
- School of Materials Science and Engineering, University of New South Wales Sydney 2052 Australia
| | - Da-Jian Jv
- Chemistry and Material Engineering College, Beijing Technology and Business University Beijing 100048 China
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He Q, Zhuang S, Yu Y, Li H, Liu Y. Ratiometric dual-emission of Rhodamine-B grafted carbon dots for full-range solvent components detection. Anal Chim Acta 2021; 1174:338743. [PMID: 34247738 DOI: 10.1016/j.aca.2021.338743] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/06/2021] [Indexed: 01/08/2023]
Abstract
Quick and visual detection of component contents, such as water, in a mixed solvent is important for many practical applications, and a full range detection is especially preferred. In this work, a carbon dots based ratiometric fluorescent sensor was synthesized by grafting fluorescent group (Rhodamine B, RhB) on carbon dots, and the dual emission peaks exhibited a linear ratiometric response with the change of polarity and hydrogen bond of Solvent Hansen solubility parameters. This responsive behavior is attributed to surface state photoluminescence mechanisms, and has been used for the quantitative detection of water content in ethanol with an excellent linear relationship (R2 = 0.996), a low detection limit (0.2%), and a full detection range (0-100%). Furthermore, a paper-based ratiometric fluorescence sensing strip is also demonstrated, which exhibits good storage stability and sensitivity. This study suggests that RhB grafted carbon dots could be feasibly and effectively used as ratiometric fluorescent sensors for solvent content detection.
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Affiliation(s)
- Qian He
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan, 030001, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Shengyi Zhuang
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan, 030001, China
| | - Yuxiu Yu
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan, 030001, China
| | - Haojie Li
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan, 030001, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Yaodong Liu
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 Taoyuan South Road, Taiyuan, 030001, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
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Singhaal R, Tashi L, Nisa ZU, Ashashi NA, Sen C, Devi S, Sheikh HN. PEI functionalized NaCeF 4:Tb 3+/Eu 3+ for photoluminescence sensing of heavy metal ions and explosive aromatic nitro compounds. RSC Adv 2021; 11:19333-19350. [PMID: 35479215 PMCID: PMC9033614 DOI: 10.1039/d1ra02910j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 05/12/2021] [Indexed: 11/21/2022] Open
Abstract
This work reports an eco-friendly hydrothermal approach for the synthesis of hexagonal NaCeF4:Tb3+/Eu3+ nanophosphors. The phase, morphology and optical properties were characterized by Powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and photoluminescence (PL) spectroscopy respectively. Herein, the as-synthesized nanophosphor was functionalized with amine rich polyethylenimine (PEI) resulting in development of a luminescent nanoprobe bearing dual sensing functions for hazardous nitroaromatics and heavy metal ions. The strong photoluminescence emission of Eu3+ ions was selectively quenched upon addition of toxic analytes at concentrations from 10 to 100 ppm due to complex formation between the analytes and PEI functionalized nanostructure. The synthesized nanomaterial shows sharp emission peaks at 493, 594, 624, 657 and 700 nm. Significantly, the peak at 594 nm shows a noticeable quenching effect on addition of toxic analytes to the aqueous solution of the nanocrystals. The nanophosphors are sensitive and efficient for the PA and Fe3+ ion detection with an LOD of 1.32 ppm and 1.39 ppm. The Stern-Volmer (SV) quenching constant (K SV) is found to be 2.25 × 105 M-1 for PA and 3.8 × 104 M-1 for Fe3+ ions. The high K SV value and low LOD suggest high selectivity and sensitivity of the nanosensor towards PA and Fe3+ ions over other analytes. Additionally, a reduced graphene oxide and nanophosphor based nanocomposite was also synthesized to investigate the role of energy transfer involving delocalized energy levels of reduced graphene oxide in regulating the luminescence properties of the nanophosphor. It was observed that PEI plays central role in inhibiting the quenching effect of reduced graphene oxide on the nanophosphor.
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Affiliation(s)
- Richa Singhaal
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
| | - Lobzang Tashi
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
| | - Zaib Ul Nisa
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
| | - Nargis Akhter Ashashi
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
| | - Charanjeet Sen
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
| | - Swaita Devi
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
| | - Haq Nawaz Sheikh
- Department of Chemistry, University of Jammu Baba Sahib Ambedkar Road Jammu-180006 India
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Zhang M, Zhai X, Sun M, Ma T, Huang Y, Huang B, Du Y, Yan C. When rare earth meets carbon nanodots: mechanisms, applications and outlook. Chem Soc Rev 2020; 49:9220-9248. [PMID: 33165456 DOI: 10.1039/d0cs00462f] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Rare earth (RE) elements are widely used in the luminescence and magnetic fields by virtue of their abundant 4f electron configurations. However, the overall performance and aqueous stability of single-component RE materials need to be urgently improved to satisfy the requirements for multifunctional applications. Carbon nanodots (CNDs) are excellent nanocarriers with abundant functional surface groups, excellent hydrophilicity, unique photoluminescence (PL) and tunable features. Accordingly, RE-CND hybrids combine the merits of both RE and CNDs, which dramatically enhance their overall properties such as luminescent and magnetic-optical imaging performances, leading to highly promising practical applications in the future. Nevertheless, a comprehensive review focusing on the introduction and in-depth understanding of RE-CND hybrid materials has not been reported to date. This review endeavors to summarize the recent advances of RE-CNDs, including their interaction mechanisms, general synthetic strategies and applications in fluorescence, biosensing and multi-modal biomedical imaging. Finally, we present the current challenges and the possible application perspectives of newly developed RE-CND materials. We hope this review will inspire new design ideas and valuable references in this promising field in the future.
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Affiliation(s)
- Mengzhen Zhang
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China.
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Ji TH, Li XL, Mao Y, Mei Z, Tian Y. Electron/energy co-transfer behavior and reducibility of Cu-chlorophyllin-bonded carbon-dots. RSC Adv 2020; 10:31495-31501. [PMID: 35520672 PMCID: PMC9056392 DOI: 10.1039/d0ra04958a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 08/17/2020] [Indexed: 12/03/2022] Open
Abstract
Cu-chlorophyllin-bonded carbon dots (CCPh-CDs) have been synthesized at room temperature, and the energy/electron co-transfer behavior between Cu-chlorophyllin molecules (CCPh) and carbon dots (CDs) is investigated via various techniques. The mean diameters of CDs and CCPh-CDs are 2.8 nm and 3.1 nm, respectively, measured by HRTEM. The absorption spectra of CCPh-CDs show two parts: the absorptions of CDs and CCPh are in the wavelength range of 300–500 nm. The PL spectra of CCPh-CDs exhibit very weak intensities, and with the decreasing of CCPh content on CDs, the corresponding intensity increases. Luminescent decay spectra show that the PL decay times of CCPh and CCPh-CDs with the highest CCPh content are single-exponentially fitted to be 3.20 ns and 12.64 ns, respectively. Furthermore, based on the electron transfer and reducibility of CCPh-CDs, Ag/Ag2O nanoparticles with a mean diameter of 10 nm can be easily prepared at room temperature under ultraviolet irradiation. The PL measurement result reveals that both electron transfer and FRET behavior take place from CCPh-CDs to Ag. Cu-chlorophyllin-bonded carbon dots (CCPh-CDs) with/without Ag/Ag2O (CCPh-CD-Ag) were obtained and investigated by optical measurements and luminescence decay spectroscopy.![]()
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Affiliation(s)
- Tian-Hao Ji
- Science College, Beijing Technology and Business University Beijing 100048 China
| | - Xue-Li Li
- Science College, Beijing Technology and Business University Beijing 100048 China
| | - Yongyun Mao
- Department of Materials Science and Engineering, Southern University of Science and Technology Shenzhen 518055 China
| | - Zhipeng Mei
- Department of Materials Science and Engineering, Southern University of Science and Technology Shenzhen 518055 China
| | - Yanqing Tian
- Department of Materials Science and Engineering, Southern University of Science and Technology Shenzhen 518055 China
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