1
|
Gao Y, Zhu Y, Wang Y, Bi J. Water-Stable Ln-MOF as a multi-emitting luminescent sensor for the detection of metal ions and pharmaceuticals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 323:124915. [PMID: 39096672 DOI: 10.1016/j.saa.2024.124915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 07/07/2024] [Accepted: 07/29/2024] [Indexed: 08/05/2024]
Abstract
The development of innovative multi-emission sensors for the rapid and accurate detection of contaminants is both vital and challenging. In this study, utilizing two rigid ligands (H3ICA and H4BTEC), a series of water-stable bimetallic organic frameworks (EuTb-MOFs) were synthesized. Luminescent investigations have revealed that EuTb-MOF-1 exhibits prominent multiple emission peaks, attributed to the distinctive fluorescence characteristics of Eu(III) and Tb(III) ions. Therefore, EuTb-MOF-1 efficiently recognized various metal ions and pharmaceutical compounds through 2D decoded maps. Fe3+ and Pb2+ exhibited significant quenching effects on the luminescence of EuTb-MOF-1, which were attributed to the internal filtering effect and the interaction between Lewis basic sites within EuTb-MOF-1 and Pb2+ ions, respectively. Furthermore, EuTb-MOF-1 demonstrated high sensitivity to sulfonamide antibiotics, with detection limits of 0.037 μM for SMZ and 0.041 μM for SDZ, respectively. In addition, EuTb-MOF-1 was immobilized to prepare MOF-based test strips, enabling direct visual detection of sulfonamides as a portable sensor. With excellent water stability, multi-responsive recognition capabilities, and high sensitivity to specific analytes, EuTb-MOF-1 is a promising candidate for environmental contaminant detection in aquatic systems.
Collapse
Affiliation(s)
- Yanxin Gao
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China.
| | - Yanyue Zhu
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Yuping Wang
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Jinhong Bi
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China; State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Minhou, Fujian 350108, PR China.
| |
Collapse
|
2
|
Song Z, Xu Y, Zhang M, Zhu W, Yang X, Hao D, Li Q. Efficient removal of Cr (VI) by Bifunction zinc porphyrin COF: Coupling adsorption with Photocatalysis, performance Evaluation, and mechanism analysis. J Colloid Interface Sci 2024; 677:346-358. [PMID: 39096703 DOI: 10.1016/j.jcis.2024.07.140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 07/13/2024] [Accepted: 07/17/2024] [Indexed: 08/05/2024]
Abstract
HYPOTHESIS Hexavalent chromium, recognized as one of the most toxic heavy metals, demands the development of advanced materials capable of both adsorption and photocatalysis for effective Cr (VI) removal. EXPERIMENTS This study successfully synthesized a two-dimensional zinc porphyrin covalent organic framework (ZnPor-COF) via a solvent-based method. Performance evaluations have demonstrated that the ZnPor-COF possesses outstanding capabilities for the adsorptive and/or photocatalytic elimination of Cr (VI). Particularly noteworthy is the observation that when adsorption and photocatalysis are coupled, the ZnPor-COF attains an exceptional 99.7 % removal rate for a Cr (VI) concentration of 30 mg/L within just 60 min, with minimal susceptibility to coexisting ions. After five consecutive cycles, the material sustains a removal efficiency of 90 %, indicative of its robust cyclability. FINDINGS Theoretical calculations, as well as experimental validations, have indicated that the integration of Zn ions into the porphyrin COF not only results in an expanded specific surface area and an increased count of adsorption sites but also significantly improves the COF's photosensitivity and the capability for charge carrier separation. Furthermore, the core of the synergistic effect between adsorption and photocatalysis lies in the ability of photocatalysis to substantially augment the adsorption process.
Collapse
Affiliation(s)
- Zhenyang Song
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Yuting Xu
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Mengyuan Zhang
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Wei Zhu
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
| | - Xudong Yang
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Di Hao
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Qing Li
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
| |
Collapse
|
3
|
Wu ZQ, Shi K, Yuan TL, Wang ZG, Li Q, Li D, Liu TH, Yin HY, Fan ZL, Zhu W. Eu3+-anchoring Zirconium-organic framework for enhancing fluorescence sensing detection sensitivity towards Cr(VI) ions. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
|
4
|
Li Q, Li D, Wu ZQ, Shi K, Liu TH, Yin HY, Cai XB, Fan ZL, Zhu W, Xue DX. RhB-Embedded Zirconium-Biquinoline-Based MOF Composite for Highly Sensitive Probing Cr(VI) and Photochemical Removal of CrO 42-, Cr 2O 72-, and MO. Inorg Chem 2022; 61:15213-15224. [PMID: 36083838 DOI: 10.1021/acs.inorgchem.2c02459] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
How to accurately detect and efficiently sweep Cr(VI) from contaminated water has come into focus. Zirconium-based metal-organic frameworks (MOFs) play vital roles in water environmental chemistry due to excellent hydrolysis-resistant stability. However, as photochemical probes and photocatalysts, poor performances in detection sensitivity, selectivity, and photosensitiveness limit sole Zr-MOFs' applications. So, it is urgent to quest valid strategies to break through the dilemmas. Embedding luminous dyes into MOFs has been considered one of the most feasible avenues. Herein, a dual-emissive RhB@Zr-MOF with orange-yellow fluorescence has been assembled by in situ-encapsulating rhodamine B (RhB) into a zirconium-biquinoline-based MOF. Actually, within RhB@Zr-MOF, the aggregation fluorescence quenching (ACQ) effect of RhB molecules was effectively avoided. Notably, RhB@Zr-MOF exhibits a rapid fluorescence quenching response toward Cr(VI) ions with high selectivity, sensitivity, and anti-interference abilities. More interestingly, unlike the most widely reported fluorescence resonance energy transfer (FRET) between MOFs and encapsulated guest modules, photoinduced electron transfer from RhB to Zr-MOF has been confirmed by modeling the ground state and excited states of RhB@Zr-MOF using density functional theory (DFT) and time-dependent DFT (TD-DFT). The effective electron transfer makes RhB@Zr-MOF more sensitive in probing Cr2O72- and CrO42- ions with ultralow detection limit (DL) values of 6.27 and 5.26 ppb, respectively. Prominently, the detection sensitivity based on DL values has been increased about 6 and 9 times, respectively, compared with pristine Zr-MOF. Moreover, rather negative CB and positive VB potentials make RhB@Zr-MOF have excellent photochemical scavenging ability toward Cr(VI) and MO.
Collapse
Affiliation(s)
- Qing Li
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Dan Li
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Zhi-Qiang Wu
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Ke Shi
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Tian-Hui Liu
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Huan-Yu Yin
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Xin-Bin Cai
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Zeng-Lu Fan
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Wei Zhu
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, P. R. China
| | - Dong-Xu Xue
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shanxi Normal University, Xi'an 710062, Shaanxi, P. R. China
| |
Collapse
|
5
|
Preethi P, Harisankar A, Soumya Mol U, Raghunandan R. Synthesis of oxydiacetate functionalized strontium coordination polymer through gel diffusion technique: A new dual luminescent chemosensor for the detection of Copper(II) ions and Cr(VI) oxyanions in aqueous medium. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
6
|
Yang H, Qi D, Si X, Yan Z, Guo L, Shao C, Zhang W, Yang L. One novel Cd-MOF as a highly effective multi-functional luminescent sensor for the detection of Fe3+, Hg2+, CrⅥ, Aspartic acid and Glutamic acid in aqueous solution. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|
7
|
Karmakar A, Velasco E, Li J. OUP accepted manuscript. Natl Sci Rev 2022; 9:nwac091. [PMID: 35832779 PMCID: PMC9273335 DOI: 10.1093/nsr/nwac091] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/04/2022] [Accepted: 03/09/2022] [Indexed: 11/12/2022] Open
Affiliation(s)
- Avishek Karmakar
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA
| | - Ever Velasco
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA
| | - Jing Li
- Corresponding author. E-mail:
| |
Collapse
|
8
|
Highly efficient and bifunctional Cd(II)-Organic Framework platform towards Pb(II), Cr(VI) detection and Cr(VI) photoreduction. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122416] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
9
|
An effective fluorescent optical sensor: Thiazolo-thiazole based dye exhibiting anion/cation sensitivities and acidochromism. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
10
|
Cation sensing by a novel triazine-cored intermediate as a fluorescent chemosensor incorporating benzothiazole fluorophore. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-021-04534-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
11
|
Li Q, Cai X, Chen LH, Guan BB, Fan ZL, Zhu W, Xue DX. Hydrolytically Stable and Trifunctional Zirconium-Based Organic Frameworks toward Cr 2O 72- Detection, Capture, and Photoreduction. Inorg Chem 2021; 60:8143-8153. [PMID: 34027670 DOI: 10.1021/acs.inorgchem.1c00794] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Chromium Cr(VI) is frequently used in many fields and has been intensively researched for detection and/or removal from contaminated water. However, the existing approaches are still of low efficiency, high cost, and cumbersome in operation. It is thus highly imperative to hunt for alternative avenues to get out of the predicament. In this work, two bcu topological and highly stable zirconium-metal-organic frameworks (Zr-MOFs) of 1 and 2 have been deliberately prepared, displaying channel-type interior spaces replete with free bipyridine/biquinoline matrices and Zr-O defect sites. Because of their unique intrinsic features of high porosity and photosensitivity, 1 and 2 were deployed as versatile platforms to sense, adsorb, and catalytically reduce Cr(VI) ions. Indeed, the Zr-MOF of 1 performs excellently in fluorescence sensing and adsorption trapping of Cr(VI), with an ultralow detection limit of 0.0176 ppm and a fairly high saturated adsorption capacity of 145.77 mg/g, while 2 is more powerful than 1 in photochemical removal of Cr(VI), exhibiting a remarkable reduction efficiency of 98.05% just within 70 min and still up to 92.21% even after five consecutive photocatalytic cycles. Furthermore, possible photoluminescence, quenching, and reduction mechanisms were also tentatively proposed. This study may open up a new avenue for addressing some unresolved environmental issues, that is, the decontamination of highly toxic Cr(VI) from water.
Collapse
Affiliation(s)
- Qing Li
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China
| | - Xinbin Cai
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China
| | - Ling-Hui Chen
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China
| | - Bin-Bin Guan
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China
| | - Zeng-Lu Fan
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China
| | - Wei Zhu
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China
| | - Dong-Xu Xue
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shanxi Normal University, Xi'an, Shaanxi 710062, P. R. China
| |
Collapse
|
12
|
Wang TT, Liu JY, An JD, Shi YF, Zhang YY, Huo JZ, Huang ZG, Liu YY, Ding B. Hydrothermal synthesis of two-dimensional cadmium(II) micro-porous coordination material based on Bi-functional building block and its application in highly sensitive detection of Fe 3+ and Cr 2O 72. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 254:119655. [PMID: 33744702 DOI: 10.1016/j.saa.2021.119655] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/19/2021] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
Metal-organic framework (MOFs), also known as porous coordination polymers (PCPs), is a new kind of crystalline porous materials, which has received extensive attention in the past few decades. As a new type of sensing material, MOFs stand out from many other traditional fluorescence sensors because of its crystal characteristics, structural diversity, stable porosity and adjustable functional characteristics. In this work, the bi-functional building block containing aromatic carboxylic acid and triazole moieties, namely 3-(1H-1,3,4-triazol-1-yl) benzoic acid, was selected as the linker to synthesize {[Cd(µ5-L)⋅I}n (1, HL = 3-(1H-1,3,4-triazol-1-yl)benzoic acid) by hydrothermal method with transition CdII metal centers. Firstly, the preliminary characterization of 1 was carried out by means of PXRD, FT-IR, and then the UV and fluorescence tests were conducted to study the fluorescence properties of 1. The crystal structure analysis indicates that CdII is the center and the ligand is bridged to form a two-dimensional porous structure. In addition, 1 has good selectivity for Fe3+ and Cr2O72-, meanwhile, it has high detection sensitivity (Ksv quenching efficiency for Fe3+: 1.2 × 104 M-1 and Cr2O72- 1.85 × 104 M-1) and low detection limit (Fe3+: 19.21 μM and Cr2O72-: 12.46 μM). The results of photoluminescence test show that 1 can detect cations and anions with high sensitivity, resist the interference of other ions, and have good reusability. As far as we know, 1 is the first example of ultra-stable two-dimensional (2D) Cadmium (II) microporous coordination material as a fluorescence sensor for Fe3+ and Cr2O72-.
Collapse
Affiliation(s)
- Tian-Tian Wang
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Jing-Yi Liu
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Jun-Dan An
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Yang-Fan Shi
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Yi-Yun Zhang
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Jian-Zhong Huo
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Zheng-Guo Huang
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Yuan-Yuan Liu
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China
| | - Bin Ding
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratoryof Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China; Tianjin Normal University, 393 Binshui West Road, Tianjin 300387, PR China.
| |
Collapse
|
13
|
Shen TY, Jia PY, Chen DS, Wang LN. Hydrothermal synthesis of N-doped carbon quantum dots and their application in ion-detection and cell-imaging. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 248:119282. [PMID: 33316652 DOI: 10.1016/j.saa.2020.119282] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 11/15/2020] [Accepted: 11/22/2020] [Indexed: 05/25/2023]
Abstract
Carbon quantum dots (CQDs), owing to their characteristic luminescent properties, have become a new favorite in the field of luminescence. They have been widely used in light emitting diode, ion detection, cell-imaging, ect. Herein a facile synthesis method of nitrogen-doped carbon quantum dots (N-CQDs) has been developedviaa one-step hydrothermal of glucose and m-phenylenediamine. The chemical composition, surface functional groups, and crystal structure of so prepared N-CQDs were systematically characterized. The characterizations indicate that nitrogen has been chemically doped in the CQDs and the N-CQDs crystallize in a graphene structure. Photoluminescence (PL) measurements show that the N-CQDs emit strong blue emission under the irradiation of ultraviolet. The emission is excitation-dependent, is resistant to photo bleaching and high ionic strength, and slightly decreases with the increase of temperature. The quantum yield of them is about 17.5%. The PL intensity of N-CQDs quenches linearly with the increase of the concentrations of Fe3+(0.5-1.0 mM) and CrO42-(0.3-0.6 mM), which are a kind of excellent fluorescent probe for the detection of Fe3+ and CrO42-. The quenching mechanism of Fe3+ and CrO42-is verified to be a static quenching mechanism based on inner filter effect. The N-CQDs are also found to be a good cell-imaging reagent of Hela cells.
Collapse
Affiliation(s)
- Tong-Yang Shen
- School of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26, Hexing Road, Harbin 150040, PR China
| | - Pei-Yun Jia
- School of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26, Hexing Road, Harbin 150040, PR China.
| | - Da-Shu Chen
- School of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26, Hexing Road, Harbin 150040, PR China
| | - Li-Na Wang
- School of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26, Hexing Road, Harbin 150040, PR China
| |
Collapse
|
14
|
Li J, Cheng H. Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions. RSC Adv 2020; 10:43425-43431. [PMID: 35519671 PMCID: PMC9058396 DOI: 10.1039/d0ra08501d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 11/16/2020] [Indexed: 01/09/2023] Open
Abstract
Molecular sieve 5A was modified with (3-aminopropyl) triethoxysilane (APTES) as the support matrix, on which 4-VP was used as the ionic imprinting group. The as-prepared IIZMS-APTES was applied as the adsorbent for the recovery of chromium(vi) from aqueous solutions. The adsorbent was characterized via Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM), and X-ray diffraction (XRD). The influences of adsorption time, concentration of the ions, initial pH, and temperature on the adsorption performance to Cr(vi) were investigated. The selectivity and reusability of IIZMS-APTES are also evaluated. The results showed that the maximum adsorption capacity reached 56.46 mg g-1 when the initial concentration of metal ions was at 100 mg L-1 at pH 2 and 30 °C. The adsorption process followed the pseudo-second-order kinetic model and Langmuir adsorption isotherm model. The IIZMS-APTES exhibits an efficient selective adsorption of Cr(vi) from aqueous solutions.
Collapse
Affiliation(s)
- Junwen Li
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University Chengdu 610065 China
| | - Haiming Cheng
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University Chengdu 610065 China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University Chengdu 610065 Sichuan China
| |
Collapse
|