ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Jinwen Li,Qingcai Chen,Tong Sha,Yongchun Liu
Metal ions are key components in atmosphere that potentially affect the optical properties and photochemical reactivity of atmospheric humic-like substances (HULIS), while this mechanism is still unclear. In this study, we demonstrated that atmospheric HULIS coupled with Fe3+, Cu2+, Zn2+, and Al3+ exhibited distinct optical properties and reactive intermediates from that of HULIS utilizing three-dimensional fluorescence spectroscopy and electron paramagnetic resonance spectroscopy. The HULIS components showed light absorption that increased by 56% for the HULIS-Fe3+ system, fluorescence blue shift, and fluorescence quenching, showing a certain dose–effect relationship. These are mainly attributed to the fact that the highly oxidative HULIS chromophores have a stronger complexing ability with Fe3+ ions than the other metal ions. In addition, triplet organics (promoting ratio: 53%) and reactive oxygen species (promoting ratio: 82.6%) in the HULIS-Fe3+ system showed obvious generation promotion. Therefore, the main assumption of the photochemical mechanisms of atmospheric HULIS in the HULIS-Fe3+ system is that Fe3+ ions can form 3HULIS*-Fe3+ complexation with photoexcited 3HULIS* and then transition to the ground state through energy transfer, electron transfer, or nonradiative transition, accompanied by the formation of singlet oxygen and hydroxyl radicals. Our results provide references for evaluating the radiative forcing and aging effect of metal ions on atmospheric aerosols.
研究领域:
环境科学
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大气化学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 11
·1-10
·
IF 5.705
Zhu Xiang,Wang Jianying,Zhu Yuhua,Jiang Honghao,Tan Di,Xu Ziqiang,Mei Tao,Li Jinhua,Xue Longjian,Wang Xianbao
N,S-co-doped carbon dots (N,S-CDs) were synthesized via a single-step solvothermal process by using sodium lignosulfonate and p-phenylenediamine as carbon/nitrogen/sulfur sources. The N,S-CDs have an average diameter of 2.02 ± 1 nm and display green fluorescence, with excitation/emission peak wavelengths at 380/540 nm for optimal fluorescence. Fluorescence is excitation wavelength-dependent and stable in aqueous salt solutions. The fluorescence of the N,S-CDs is selectively quenched by Fe(III) and Ag(I) ions. These ions can be quantified by fluorometry with a limit of detection of 1.7 μM for Fe(III) ions and 11.6 μM for Ag(I) ions. The N,S-CDs also undergo solvatochromism in that emission is green in water solution but blue in polar organic solvents such as ethanol or N,N-dimethylformamide. The color of fluorescence gradually shifts from green to blue when continuously increasing the fraction of organic solvent in water.
N,S-co-doped carbon dots (N,S-CDs) are synthesized by using sodium lignosulfonate and p-phenylenediamine as C/N/S sources. The N,S-CDs can sensitively detect Fe(III) and Ag(I) ions based on fluorometry, and can be used as a solvatochromic probe.
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Shiliang Wei,Kun Jia,Hongguo Shou,Xuefei Zhou,Pan Wang,Xiaobo Liu
Polyarylene ether nitrile (PEN) is traditionally used as high performance thermoplastics in various advanced engineering materials fields. However, the preparation of optically active PEN based materials, especially in aqueous solution, is still a great challenge. In this work, the side chain carboxylated PEN can be readily dissolved in alkaline solution but showing strongly quenched luminescence. Fortunately, the cationic surfactant of cetyltrimethylammonium bromide (CTAB) was able to recover the fluorescence emission of water soluble PEN, which can be subsequently quenched by Fe 3+ ions, leading to the selective determination of Fe 3+ ions in aqueous solution.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 7
·2291-2298
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IF 4.58
Wu Huifang,Jiang Jiahui,Gu Xiaoting,Tong Changlun
Nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) with a high quantum yield (69%) and excellent photoluminescent properties were synthesized via a facile hydrothermal method using citric acid and cysteine as precursors. The cytotoxicity of N,S-CQDs was evaluated through the MTT assays using HepG2 cells as the target. The cell viability is still >95% after a 24 h incubation with particles in a concentration of up to 300 μg·mL −1 , thereby indicating low cytotoxicity and excellent biocompatibility of N,S-CQDs. The emission spectra of the N,S-CQDs are nearly independent of the excitation wavelengths in the range from 280 to 380 nm and have the strongest fluorescence emission centered at 415 nm. Co-doping with N and S promotes the electron-transfer rate and coordination interaction between N,S-CQDs and Fe(III) ions which acts as a quencher of fluorescence. Fluorescence can be recovered, however, by addition of L-Cys. Hence, the N,S-CQDs act as a highly sensitive and selective “turn-off-on” probe for the determination of Fe(III) or Cys. The limits of detection are 14 nM for Fe(III) and 0.54 μM for Cys. The interferences by 17 common metal ions and heavy metal ions, 12 other quenchers and 16 amino acids were investigated and found to be tolerable. The probe was successfully applied for cellular imaging of Fe(III) in HepG2 cells by using fluorescence microscopy.
Nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) with a high quantum yield of 69% were prepared through a facile one-step hydrothermal method. They are shown to be a highly sensitive and selective fluorescent “turn-off-on” probe for Fe(III) ions and cysteine.
研究领域:
分析化学
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生物医学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Baocheng Zhou,Ying Liu,Wei Zhao,Changhao Bian,Pengfei Sun
In this study, a new graphitic carbon nitride (CN) catalyst was synthesized by combining 5-sulfonic-8-hydroxyquinoline (SQ) and Fe (III) ions. Photocatalysis reduction of nitroaromatic compounds was employed to evaluate the catalytic performance of the synthesized catalyst. Compared to the pristine CN, the optimized CN-SQ-2-Fe photocatalyst showed enhanced absorption in visible light region, which promoted photogenerated charge transfer and separation. Herein, we also developed a green and efficient photocatalysis route to convert nitrophenols (NPs) into aminophenols (APs) using CN-SQ-2-Fe photocatalyst. The visible light, separation of photogenerated charges and carrier transportation of the optimized sample CN-SQ-2-Fe were significantly improved in comparison with the pristine CN and the modified samples of CN-Fe and CN-SQ-2. Accordingly, the CN-SQ-2-Fe showed a high conversion (96%) of p- nitrophenol ( p- NP) to p- aminophenol ( p- AP) under visible light irradiation for 2 h and possessed high photocatalytic durability. Different NP compounds were also studied under the condition of photocatalysis reduction and demonstrated high conversion (>97%). Finally, a possible mechanism was proposed for the photocatalytic reduction of p- NP by CN-SQ-2-Fe. This work provides an effective approach to prepare graphitic carbon nitride (CN) modified by 5-sulfonic-8-hydroxyquinoline (SQ) and Fe (III) ions, which is a potential visible light driven photocatalyst for the reduction of nitrobenzene derivatives.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 46
·28637-28646
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IF 3.108
Pei Song,Lisha Zhang,Hao Long,Meng Meng,Ting Liu,Yongmei Yin,Rimo Xi
In this research, we developed a multianalyte fluorescence sensing system through a carbon dots (CDs)-based fluorescent probe that can specifically recognize Fe(III) by fluorescence quenching. The CDs prepared using black tea by a hydrothermal method show outstanding properties like low cytotoxicity, high photostability, excellent biocompatibility, and high sensitivity. It was found that the fluorescence of CDs can be quenched by micromolar concentrations of Fe(III) in both aqueous solutions as well as living cells. It is well known that glucose can be oxidized by glucose oxidase (GOx) to release H2O2, which, in turn, can oxidize Fe(II) to Fe(III). Based on this consideration, a multianalyte sensing system was established. Therefore the quantitative analysis of Fe(III), H2O2, and glucose with detection limits of 0.25 μM, 0.82 μM, and 1.71 μM, respectively, was achieved by the simple and cost-effective multianalyte CDs sensing system constructed. The sensing system showed high photostability and negligible cytotoxicity toward HeLa cells, which enables it to be applied in the visualization of Fe(III) or H2O2 in living cells. The system was further applied in the detection of Fe(III) or glucose in human serum, and satisfactory results were obtained.
研究领域:
分析化学
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材料科学
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生物化学
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生物医学工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Nan Zhang,Yan Gao,Kangjia Sheng,Xianliang Xu,Wanghui Jing,Tao Bao,Sicen Wang
Herein, corncob waste was used as a scaffold for the fabrication of effective adsorbents. Porphyrinic zirconium metal-organic frameworks (MOFs) PCN-223 and PCN-224 constructed by different numbers of Zr6 cluster nodes were grown on the surface of the corncob. Fe (Ш) ions were implanted in the porphyrin ring by post-synthesis modification. The results showed that the extraction capacity of diuretics on [email protected] containing suitable pore size was larger than that of [email protected] The adsorption of diuretics was further enhanced because of the electrostatic effect caused by implantation of Fe (Ш) ions. [email protected] was recyclable and selective for the extraction of furosemide (Fur) and bumetanide (Bum). Coupled in-syringe solid phase extraction (IS-SPE) with ultra-performance liquid chromatography (UPLC), an efficient, sensitive, and stable method was established. With a sensitivity between 0.6 and 1.0 μg/L and a recovery between 83.2% and 119.2%, it is used for the analysis of trace amounts of Fur and Bum in weight loss products and environmental water. The functionalized corncob has potential application for the adsorption of diuretics, and the metal ions implantation in MOFs provides a promising strategy for enhancing extraction capacity.
研究领域:
材料科学
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环境化学
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分析化学
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废物管理
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产品关联
DOI
PubMed
高影响因子
Gels
·
2022
·Vol. 8
·期 6
·331
·
IF 4.432
Jiayan Shen,Shutong Du,Ziyao Xu,Tiansheng Gan,Stephan Handschuh-Wang,Xueli Zhang
Artificial shape-morphing hydrogels are emerging toward various applications, spanning from electronic skins to healthcare. However, the low freezing and drying tolerance of hydrogels hinder their practical applications in challenging environments, such as subzero temperatures and arid conditions. Herein, we report on a shape-morphing system of tough organohydrogels enabled by the spatially encoded rigid structures and its applications in conformal packaging of “island–bridge” stretchable electronics. To validate this method, programmable shape morphing of Fe (III) ion-stiffened Ca-alginate/polyacrylamide (PAAm) tough organohydrogels down to −50 °C, with long-term preservation of their 3D shapes at arid or even vacuum conditions, was successfully demonstrated, respectively. To further illustrate the potency of this approach, the as-made organohydrogels were employed as a material for the conformal packaging of non-stretchable rigid electronic components and highly stretchable liquid metal (galinstan) conductors, forming a so-called “island–bridge” stretchable circuit. The conformal packaging well addresses the mechanical mismatch between components with different elastic moduli. As such, the as-made stretchable shape-morphing device exhibits a remarkably high mechanical durability that can withstand strains as high as 1000% and possesses long-term stability required for applications under challenging conditions.Keywords:organohydrogels;anti-freezing;shape-morphing;tough hydrogels;flexible electronics
研究领域:
材料科学
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柔性电子
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生物医学工程
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聚合物科学
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DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Li Li,Zhenyuan Xing,Qiaorong Tang,Lei Yang,Li Dai,Huan Wang,Tao Yan,Weiying Xu,Hongmin Ma,Qin Wei
In this work, a mussel-inspired polydopamine (PDA) nanoparticle with biocompatible and reactive surface characteristics was desirably incorporated with high loading capacity and pH-induced disassembly-releasing behavior toward Fe(III) ions to develop an enzyme-free colorimetric immunoassay. The catechol functional network of PDA can act as a scaffold to coordinate with large amounts of Fe(III) ions to form the PDA-Fe(III) NPs whose coordination state can be tailored by changing the pH values. In detail, PDA-Fe(III) NPs can be maintained in a disassembled tri-coordinate state under alkaline conditions while the highly loaded Fe(III) ions can be easily released under acid conditions to react with ferrocyanide for the in situ generation of Prussian blue (PB) NPs. The detection sensitivity of prostate-specific antigen (PSA) was significantly improved, owing to the high peroxidase-like activity of PB NPs that triggered excellent catalytic effect by the colorimetric reaction. In addition, favorable linearity was found in the range of 0.0005–20 ng mL–1 with a low detection limit of 0.84 pg mL–1 (S/N = 3). Furthermore, excellent selectivity and reproducibility were exhibited by the developed enzyme-free colorimetric immunoassay. It is believed that this proposed PDA-Fe(III) NP-based enzyme-free colorimetric system will offer a facile and reliable tool for the sensitive detection of PSA and other cancer biomarkers in human serum.
研究领域:
分析化学
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纳米技术
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生物传感器
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医学诊断
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产品关联
DOI
PubMed
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