Journal of Physical Chemistry C
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2024
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IF 3.3
Dongao Xie,Changxin Tang,Dan Li,Jiren Yuan,Feigao Xu
FeOCl has attracted much attention for its good photo-Fenton properties. However, there are still some limitations to the removal efficiency of organic pollutants. Visible-light-responsive FeOCl/CdS quantum dot composites were prepared by calcination to overcome their flaws, and their catalytic activity was explored by the degradation of acid orange II (AO-II). The experimental results showed that the FeOCl/CdS composites exhibited better catalytic performance than pure components. The F1Cd0.5 composite (mass ratio of FeOCl to CdS is 1:0.5) achieved 98.5% removal efficiency of AO-II, which is 14.8 times higher than that of FeOCl+CdS under similar experimental conditions; moreover, the F1Cd0.5 composite still exhibits a high stability after five cycles. According to the characterization and experimental results with density functional theory calculations together, it is proposed that the type II carrier transfer-separation mechanism plays a leading role in enhancing the photodegradation performance of the photo-Fenton catalysts. This study provides a new idea to further improve the catalytic efficiency of the photo-Fenton technology for organic pollutant degradation.
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Journal of Materials Chemistry A
·
2024
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IF 10.7
Ruiding Fei,Jianfeng Zhao,Huinan Wang,Huijuan Lin,Kui Xu,Guang Zeng,Wenchao Wang,Zhiping Yan
The hydrogen evolution capacity of MoS2 is impeded by its intrinsically highly electronegative sulfur sites, which firmly bind absorbed atomic H through S–Hads bonds and subsequently diminish H2 release. Designing effective surface-active sites to optimize atomic hydrogen activation and desorption for the hydrogen evolution reaction (HER) in water, while also expanding near-infrared (NIR) light responsiveness, remains a significant challenge. We have developed complexes of sulfur vacancy (Sv) enriched CdSv capped with W-modified MoS2+x (MoWS2+x) through an in situ substitution approach, followed by a photoreduction reaction. The bimetallic MoWS2+x cocatalyst not only increases the density of unsaturated coordinating S active sites but also attenuates the strength of the S–Hads bond. The optimized MoWS2+x/CdSv hybrid shows synergistic improvement of atomic H activation and desorption for the solar-driven HER, achieving the highest recorded H2-evolution rate of 9166.13 μmol g−1 h−1 under visible light (λ ≥ 420 nm), which marks a substantial improvement (greater than 750%), and an apparent quantum yield of 19.13%. Remarkably, the target photocatalyst, which is abundant in sulfur vacancies within its CdSv component, also achieves H2 production driven by NIR light beyond 780 nm, with a H2 evolution rate of 1326.82 μmol g−1 h−1. Comprehensive experimental and theoretical investigations corroborate that the existence of unsaturated coordinated S sites mitigates the strength of S–Hads bonds, resulting in the high driving force of H2 bubble release from water and long-lived active charge carriers. In this paper, we constructed visible light and NIR-active photocatalysts successfully for hydrogen production, highlighting the synergetic effects within this unique system. Additionally, the photo-behaviors of charge carriers have been investigated by ultra-fast spectroscopic techniques to gain a deeper understanding of the interfacial charge transfer kinetics. This study provides valuable insights into the development and optimization of photocatalysts that are responsive to both NIR and visible light, paving the way for more efficient solar-driven applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Xin-Ran Guo,Yan-Xin Guo,Juan Chen,Xin-Yue Chen
In this work, a simple and sensitive ratiometric fluorescence probe to detect isoniazid (INH) was developed on the basis of carbon dots and MnO 2 nanosheets (MnO 2 NS). Nitrogen-doped carbon dots (FMT-CDs) were synthesized by microwave method using formononetin (FMT) in ammonia water. The oxidase-like activity of MnO 2 NS was utilized to oxidize non-fluorescent o -phenylenediamine (OPD) to 2, 3-diaminophenazine (DAP) with orange fluorescence. It was demonstrated that DAP could effectively quench the fluorescence of FMT-CDs through the inner filtering effect (IFE). Due to the reducing nature of INH, MnO 2 NS was decomposed and thus lost its oxidase-like activity after the addition of INH. Therefore, the production of DAP was reduced, and the fluorescence intensity was decreased, while IFE on FMT-CDs was weakened and the fluorescence of FMT-CDs was recovered. Based on the above principle, a sensitive method for the detection of INH was established based on the fluorescence intensity ratio of the two fluorescent substances, FMT-CDs and DAP, and was successfully applied to the detection of INH in human urine samples. The limit of detection (LOD) could reach to 0.16 μM in human urine samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Ming Li,Xuemeng Zhang,Dongqing Wang,Xiaofei Fan,Qianyong Cao,Huining Xiao,Shiwei Guo,Chungang Yuan,Yuling Zhang
Nanofiltration membranes are extensively implemented in water treatment, particularly for the efficient interception of toxic heavy metal ions. This work introduces a novel functional membrane fabricated via interfacial polymerization, incorporating nitrogen and sulfur co-doped carbon dots (N, S-CDs) as additives to enhance mercury removal from aqueous solutions. The integration of carbon dots has been demonstrated to significantly augment the membrane’s hydrophilicity, thereby improving the pure water flux. Moreover, it modulates the crosslinking degree of the polyamide layer, enhancing mercury retention. The N, S-CDs, due to their high selectivity for Hg (II), confer the modified membrane with fluorescence detection capabilities, allowing for the precise quantification of mercury rejection. The membrane achieved a remarkable Hg (II) retention rate of 94.85 %, with a pure water flux of 10.68 L m −2 h −1 bar −1 , and attained a detection limit of 5.49 × 10 −7 M for Hg (II). The durability and reusability of the membrane are substantiated by soaking and recycling trials, underscoring the stable encapsulation of N, S-CDs within the nanofiltration matrix.
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JOURNAL OF LUMINESCENCE
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2024
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IF 3.3
Yaxin Li,Mei Chen,Hongzhi Lu,Shoufang Xu
A straightforward and highly sensitive ratiometric fluorescence sensor comprising blue emissive carbon dots , silver nanoprisms, and o-phenylenediamine (B-CDs-Ag NPRs-OPD) was developed for the detection of H 2 O 2 and glucose. Ag NPRs were etched into Ag + ions upon exposure to H 2 O 2 , which caused non-fluorescent OPD to be oxidized and produce 2,3-diaminophenazine (DAP), resulting in intense yellow fluorescence emission at 555 nm. DAP can quench the B-CDs based on inner filter effect (IFE), leading to a decrease in their fluorescence intensity at 435 nm. Because glucose oxidase may catalyze the oxidation of glucose to produce H 2 O 2 , this approach can also be used to detect glucose. The unique triangular structure leads to the easy etching of the edge and tip of Ag NPRs by H 2 O 2 into Ag + ions, allowing for the high sensitivity of detection of H 2 O 2 and glucose with limit of detection (LOD) of 0.12 μM and 0.6 μM, respectively. Furthermore, with the increase of the concentrations of H 2 O 2 and glucose, a visible color shift from blue to yellow-green occurs, which can be detected using a smartphone's color recognition application that captures the RGB channel values of the image. Real-time and on-spot detection of H 2 O 2 and glucose were achieved based on smartphone sensing platform, presenting vast potential for applications in various fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yu Qiao,Jinniu Zhang,Jia Liu,Yumeng Liu,Xinlei Zhang,Zhibo Yang,Xiaoqiang Yin,Jianzhi Gao,Chunlan Wang,Hongbing Lu
NO 2 is one of the most important atmosphere pollutants, causing great harm to the human body at very low concentrations (ppb levels). Herein, a novel fabrication idea for gas sensing materials was reported to detect ppb-level NO 2 via MOF-derived porous In 2 O 3 nanospheres (NSs) sensitized by CdS quantum dots (QDs). The good distribution of CdS QDs (2.5–4.0 nm) on porous In 2 O 3 NSs was verified by the transmission electron microscopy and element mapping analyses. In comparison to In 2 O 3 NSs, the CdS@In 2 O 3 composite nanospheres (CNSs) exhibited exceptional responses to ppb-level concentrations of NO 2 ( S =425.1@100 ppb) at room temperature (RT, 25 °C), while also demonstrating good selectivity and response reproducibility. These improvements in sensing performance were attributed to the synergies of the electronic effects of CdS QDs, MOF-derived porous nanostructures , and enhanced adsorption of NO 2 and active O 2 – by well-dispersed CdS QDs. This work emphasizes that the MOF-derived In 2 O 3 porous NSs sensitized by CdS QDs can accurately detect ppb-level concentrations of the NO 2 at RT.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-11
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IF 5.3
Chen Chao,Zhang Yihao,Gao Sineng,Wang Linfan,Zhang Ting,Li Tingting,Qian Xiaoqing,Chen Da
Fluorine-doped carbon dots (F-CDs) are prepared through a one-pot hydrothermal method starting from ciprofloxacin, exhibiting a bright blue emission at 453 nm under the optical wavelength of 358 nm. The sensitive sensor for detecting Cu 2+ is established based on the fluorescence quenching of F-CDs, which is attributed to the static quenching caused by the formation of non-luminescent complexes between them. The limit of detection (LOD) is 46.2 nM. Meanwhile, a portable fluorescence sensor based on a lateral flow test strip (LFTS) has been developed for practical applications, which allows real-time monitoring of Cu 2+ with a satisfactory limit of detection (LOD) of 69.7 nM in a good linear range of 0.0697–50 μM. In addition, the identification of latent fingerprints (LFPs) based on F-CDs has been developed with the assistance of MATLAB, realizing high-performance fingerprint visualization and recognition. The results serve to underscore that the synthesized F-CDs not only provide a new tool for Cu 2+ detection in real samples, but also show great potential for LFPs visualization and information identification. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Zongbo Zhang,Shiliang Song,Yan Ding,Jianhai Yu,Wenting Wu,Jin Li,Xin Wang,Yong Guo,Liang Gong
The precise and controllable preparation of carbon nanomaterials under mild conditions poses a great challenge, especially for metal-catalysed multiphase preparation. This work proposes an efficient method that utilizing high-density ultrasound to enhance the liquid-liquid interfacial reaction system. Iron-doped carbon dots (Fe-CDs) are successfully synthesized in such a normal temperature and atmospheric-pressure reaction condition. It is shown that transient cavitation provides a high-temperature and high-pressure microenvironment for the preparation of Fe-CDs. Moreover, the size of the reactant droplets is reduced from 200.0 ± 17.3 μm to 8.1 ± 2.9 μm owing to the acoustic flow and cavitation effects, which increases the specific surface area of the two reacting phases and improves the mass transfer coefficient by more than 252.0 %. As a result, the yield increases by more than an order of magnitude (from 0.7 ± 0.1 % to 11.9 ± 0.2 %) and the Fe doping rate reaches 20.9 %. The photocatalytic oxidation conversion of 1,4-Dihydropyridine (1,4-DHP) using the obtained Fe-CDs is as high as 98.2 %. This research gives a new approach for the efficient and safe production of Fe-CDs, which is promising for industrial applications.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-13
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IF 5.3
Li Fang,Luo Mingming,Tan Yijun,Liu Ruowei,Xu Longping,Zhao Pei,Wu Zijian
A dual-mode electrochemical and fluorescent sensing platform for the highly sensitive detection of kanamycin (KANA) in milk was constructed, which leveraged the synergistic effects of carbon dots (CDs)-loaded metal–organic frameworks (CDs@Cu/Al-MOF) and Ti 3 C 2 , along with the competitive binding of complementary DNA (cDNA) strands to KANA-specific aptamers. Loading CDs onto Cu/Al-MOF effectively prevented the aggregation of CDs and shielded the fluorescent signals from environmental interference, significantly enhancing signal stability. When a glassy carbon electrode (GCE) functionalized with Ti 3 C 2 and aptamers was immersed in a solution of cDNA-functionalized CDs@Cu/Al-MOF, the aptamers hybridized with the cDNA, anchoring the CDs@Cu/Al-MOF onto the GCE surface. This resulted in enhanced electrochemical signals and weakened fluorescence intensity in the solution. Upon introduction of KANA, the aptamer preferentially bound to KANA and the cDNA/CDs@Cu/Al-MOF detached from the electrode, leading to a decrease in the electrochemical signal and an increase in the fluorescence signal. The developed dual-mode aptasensor enabled highly sensitive detection of KANA within a range of 100 fM-1 μM, with the limit of detection (LOD) as low as 0.5254 fM (electrochemical mode) and 0.4398 fM (fluorescence mode). The dual-mode aptasensor exhibited excellent selectivity, reproducibility, and promising performance in real milk sample analysis. Graphical
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Hao Ye,Rou-Ming Wen,Ming-Bang Wu,Zi-Hao Yuan,Jun Cao,Chaorong Li,Juming Yao
Photoreduction of soluble U(VI) to insoluble U(IV) by CdS-based catalysts shows great potential in remediating radioactive wastewater in terms of environmental friendliness and desirable bandgap as well as the availability of CdS, but is still limited by undesirable efficiency and stability from photogenerated carrier recombination and photocorrosion. Herein, we have elegantly designed tailor-made CdS@Prussian blue with homo/heterojunctions via one-pot kinetic regulation. The key to such a structure is to leverage the outstanding binding affinity between cyanogroups of Prussian blue and Cd 2+ to create diversity of local precursor concentration differences. With such unique structure and rational energy band distribution, our photocatalysts demonstrate an unprecedented U(VI) removal efficiency as high as 2.5 times that of the pristine CdS. More importantly, the strong chelation between cyanogroups and Cd 2+ endows our catalysts with extremely excellent stability compared with other state-of-the-art composite photocatalysts. This work provides a facile and universal inspiration for homo/heterojunction engineering of high-performance photocatalysts for photoreduction of uranium.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Lingtun Hao,Maofeng Ding,Song Song,Yong You,Xingang Li
Photocatalytic amino acid synthesis from biomass is a promising and renewable method, yet the synthesis efficiency remains suboptimal. Here, we report a novel strategy for synthesizing 2D/2D CdS/1T-MoS 2 heterojunctions by leveraging 1T-phase MoS 2 with distorted octahedral coordination and sulfur-rich edges to promote the formation of large contact areas and abundant interfacial sulfur vacancies in combination with CdS. CdS/1T-MoS 2 displays exceptional photocatalytic performance for amination of biomass-derived α-hydroxy acids to α-amino acids, achieving an alanine formation rate of 23.3 mmol·g -1 ·h -1 from lactic acid, which is 4.4 and 1.6 times higher than those of CdS and CdS/2H-MoS 2 , respectively. Detailed characterizations reveal that CdS/1T-MoS 2 possesses abundant interfacial sulfur vacancies at the 2D/2D heterojunction interface compared to CdS and CdS/2H-MoS 2 . These vacancies create numerous Lewis acids sites, significantly enhancing the adsorption and activation of hydroxyl groups in lactic acid, thereby promoting the dehydrogenation step. Moreover, CdS/1T-MoS 2 facilitates the condensation of pyruvic acid with ammonia and promotes the desorption of alanine from the catalyst surface, effectively improving the reductive amination step. Additionally, CdS/1T-MoS 2 exhibits superior charge carrier separation and migration efficiency, further boosting its photocatalytic amination activity. This study provides a novel strategy for synthesizing 2D/2D heterojunctions with abundant interfacial vacancies for efficient photocatalytic biomass valorization.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
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IF 4.464
Hongmin Gao,Ze Zhang,Yingcong Zhang,Hongwei Yu,Shengzhong Rong,Lingqiang Meng,Shizhen Song,Yong Mei,Hongzhi Pan,Dong Chang
Resonance energy transfer (RET), as an efficient strategy, has been widely used for exploring a variety of biological processes and achieving sensitive bioanalysis. In this work, fluorescence and electrochemiluminescence (ECL) RET between graphitic carbon nitride (g-C 3 N 4 ) and NIR CdTe/CdS QDs was reported firstly. Based on this novel RET system, a sensitive sandwich-type ECL immunosensor was constructed to detect cancer antigen 125 (CA125). In this strategy, the ECL of Au NPs-functionalized graphitic carbon nitride nanohybrids (Au-g-C 3 N 4 NHs) was efficiently quenched by near-infrared CdTe/CdS quantum dots (NIR CdTe/CdS QDs), where NIR CdTe/CdS QDs acts as acceptors, and Au-g-C 3 N 4 NHs acts as donors. Au NPs improved the intensity and stability of ECL and provided sites to immobilize the antibody. Silica nanospheres carried abundant NIR CdTe/CdS QDs (QDs-SiO 2 ) labeling secondary antibodies, further enhancing the quenching effect. Under the optimum conditions, the constructed immunosensor showed excellent analytical performance with a linear concentration of CA125 from 0.0001 U mL −1 to 10 U mL −1 and the limit of detection reached 0.034 mU mL −1 (S/N = 3). Meanwhile, the immunosensor also revealed great stability, reproducibility, and selectivity and it could be applied in human serum samples successfully. This strategy provided a useful analytical method for the sensitive detection of biomarkers in the early stages of the disease and an innovative reference for developing more efficient and sensitive RET bioanalysis.
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