SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Yizhong Shen,Shaopu Liu,Ling Kong,Dan Li,Youqiu He
Thioglycolic acid-capped (TGA-capped) CdTe/CdS quantum dots (QDs) were prepared in the water phase. The interaction of TGA-CdTe/CdS QDs with polymyxin B sulfate (POBS) was investigated by ultraviolet–visible (UV–vis) absorption, fluorescence (FL), resonance Rayleigh scattering (RRS) spectroscopy and the measurement of fluorescence lifetime . Under optimum conditions, not only the UV–vis absorption and fluorescence spectra were changed, but also the RRS intensity was greatly enhanced. These phenomena offered useful techniques for the determination of POBS with fluorescence quenching and RRS methods . The linear ranges and detection limits of POBS were 0.09–5.25 μg mL −1 and 27.5 ng mL −1 for the fluorescence quenching technique, 0.02–6.0 μg mL −1 and 6.36 ng mL −1 for the RRS technique. Among them, the RRS approach obtained the higher sensitivity. Accordingly, a novel rapid, convenient, and highly sensitive RRS method for the determination of POBS was proposed and applied to detect POBS in pharmaceutical preparations with satisfactory results. Furthermore, the suitable reaction conditions, affecting factors as well as the influence of coexisting substances were studied. Some possible reaction mechanisms were also discussed.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 11
·1-12
·
IF 2.4
Lu Wei,Zhou Liang
Photocatalytic regeneration of nicotinamide adenine dinucleotide (NADH) is indispensable for the sustainability of enzyme-driven industrial processes. In this study, we developed a Z-scheme heterogeneous photocatalyst consisting of CdS and g-C 3 N 4 , which markedly enhanced visible-light absorption and photogenerated charge separation efficiency, and applied it to an in situ visible-light-driven NADH regeneration system. The synthesized catalyst afforded an exceptional NADH regeneration yield of 97.88% within just 15 min. Additionally, enzyme activity assays utilizing alcohol dehydrogenase (ADH) demonstrated that 67.60% of NAD + was successfully converted into the enzymatically fraction, 1,4-NADH. Furthermore, formate dehydrogenase (FDH) immobilized on ZIF-8 was integrated into this NADH regeneration system, enabling highly sustainable biosynthesis of formic acid. During a 2 h continuous reaction, the integrated system successfully accumulated a total formic acid concentration of 0.88 mM. This novel Z-scheme photocatalytic system thus presented a highly effective solution for regenerating active NADH, providing valuable insights and promoting the development of photocatalysis-driven enzymatic systems for sustainable solar-to-chemical energy conversion. Graphical
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Small
·
2026
·
IF 11.8
Yue Liu,Xinyuan Wang,Xueyu Shi,Shaogui Wu
Nitrogen and sulfur co-doped carbon dots (N, S-CDs) were synthesized through a facile one-step hydrothermal approach that employed L-proline as the carbon precursor and methyl orange as the dopant. The as-prepared N, S-CDs exhibited robust cyan photoluminescence with a high quantum yield of 22.5%. Because of their superior optical properties, these N, S-CDs were developed as a sensitive fluorescent probe for the selective detection of chlortetracycline (CTC). The sensing mechanism was attributed to dynamic quenching, yielding a wide linear response from 0 to 25 µmol·L −1 ( R 2 = 0.998) and a low detection limit of 0.94 µmol·L −1 . The practical utility of this probe was validated in environmental water and milk samples, achieving satisfactory recoveries ranging from 83.67% to 94.46%. Additionally, multifunctional PVA@N, S-CDs composite films were fabricated by incorporating N, S-CDs into a polyvinyl alcohol (PVA) matrix via a solvent-casting method. These flexible and highly transparent films demonstrated exceptional UV protection, effectively shielding over 99.5% of UV-C and UV-B radiation while converting the absorbed energy into visible light through the down-conversion effect. Application trials using grapes as a food model confirmed that the composite films significantly mitigated UV-induced deterioration and moisture loss. Overall, this work presented a versatile carbon dot-based platform that integrates specific chemical sensing with efficient UV-shielding, providing a promising strategy for advanced applications in smart food packaging and environmental monitoring.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Luping Feng,Lixiang Zhang,Xi Chen,Chunxian Zhang,Guojiang Mao,Hua Wang
An ultrasensitive and selective photoelectrochemical (PEC) platform has been developed for determining Hg 2+ with “turn-on” signal output by synergistically using CdS nanowires (NWs) and ZnS quantum dots (QDs). CdS NWs was first prepared and then deposited with ZnS QDs to yield ZnS/CdS nanocomposite with type-II heterostructure. It was found that the as-constructed ZnS/CdS heterostructure can exhibit excellent photoelectrochemical characteristics by separately employing CdS NWs and ZnS QDs as the photosensitizer and Hg 2+ -recognition probe. What's more, the constructed analysis platform could display specifically enhanced photocurrent responses to Hg 2+ under the visible light via the selective ion-exchange reaction. The in-situ formation of ternary HgS/ZnS/CdS could be thus expected with double type-II heterostructures so as to further enhance the transferring and separation of charges. A linear response can be achieved for Hg 2+ in the concentration range from 0.0010 to 5.0 nM, with a detection limit of 0.40 pM. Moreover, the application feasibility of the developed sensor with ZnS/CdS heterostructure could be testified by detecting Hg 2+ ions in environmental waters. Such a route of in-situ formation of double type-II heterostructure might promise the wide applications for designing different visible light-driven PEC sensors for probing heavy metals like Hg 2+ with the “turn-on” signal output.
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Analytical Methods
·
2023
·
IF 3.1
Yan Wu,Chengwei Zuo,Yujie Mou,Hao Wang,Yongrui Hou,Xiaodong Su,Zhenfu Jia,Huidong Qiu
In this study, a new type of red light-emitting carbon dots (R-CDs) that can selectively recognize Cr(VI) was prepared by using the strategy of 2,4-diaminophenol to enhance the fluorescence of O-phenylenediamine based carbon dots. The results showed that 2,4-diaminophenol increased the quantum yield (QY) of carbon quantum dots (CDs), and the QY of CDs increased from the original 8.7% to 20.1%(R-CDs). R-CDs show sensitivity to acidic conditions and maintain good linearity between pH = 1.00-4.00, making them useful for pH probes. Furthermore, the prepared R-CDs possess good solubility in water. They are responsive to changes in Cr(VI) concentrations in aqueous environments. R-CDs' quenching was linearly correlated with the Cr(VI) concentration within a range of 0-20 μM, with a lower detection limit of 66 nM. The detection mechanism is attributed to the formation of hydrogen bonds between Cr(VI) and R-CDs, resulting in the fluorescence quenching of R-CDs. R-CDs could be considered effective multifunctional fluorescent probes for pH and Cr(VI) in aqueous environments. This study will provide new R-CD design strategies that selectively identify specific target substances.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Huiyu Zou,Wuming Wu,Jingjing Zhou,Chunyan Deng
In this study, a novel integrated photoelectrochemical (PEC) sensor platform was proposed, utilizing an optical fiber (OF) as the working electrode for guided in situ light. A CdS quantum dots (QDs)/ZnO nanosheets (NSs) n-n heterojunction was quickly and easily constructed on the OF surface by successive ionic layer adsorption and reaction (SILAR). Au nanoparticles (NPs)@dsDNA as a capturing probe were modified on the CdS QDs/ZnO NSs@OF (CZ@OF). Due to the energy transfer between Au NPs@dsDNA and CdS QDs, the resultant opto-electrode has a lower background near zero, enabling the “signal-on” detection of biomarkers (interleukin-6 (IL-6) as a model). The OF-PEC biosensor demonstrated a wide linear range from 1 to 100 pg mL–1 with a regression coefficient (R2) of 0.9958 and an impressive detection limit (LOD) of 0.19 pg mL–1. More significantly, the proposed OF-PEC can be successfully used for the detection of IL-6 in serum samples from patients with pulmonary arterial hypertension, and it showed consistency and is more sensitive to trace concentrations compared to BD FACSCanto II flow cytometry used at the hospital. This holds significance for an early disease diagnosis. Therefore, the proposed OF-PEC not only achieves integration of the light source and sensing interface but also enables sensitive and accurate “signal-on” detection of IL-6. Furthermore, due to the flexibility and remote detection capabilities of OF, the application of OF-PEC is expected to be expanded more widely. This approach opens up possibilities for advances in PEC sensing.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jian Liu,Ming Xia,Rong Chen,Xun Zhu,Qiang Liao,Dingding Ye,Biao Zhang,Wei Zhang,Youxu Yu
Photocatalytic fuel cell (PFC) is a promising wastewater treatment technology, which cannot only purify wastewater but also generate electricity using solar energy. In this study, a membrane-less visible-light responsive micro PFC was developed, where the CdS/ZnS-TiO 2 deposited on a conductive glass as a photoanode and CuO deposited on the porous carbon paper as an air-breathing photocathode were laterally arranged. Such design allows for both the photoanode and photocathode to be irradiated simultaneously from one side and enhances photon and mass transport. It was found that the developed micro PFC with dual photoelectrodes well responded to light illumination and exhibited good long-term performance. Experimental results also showed that upgrading the light intensity and methanol and electrolyte concentrations could improve the discharging performance because of larger amount of generated electron-hole pairs and more hole scavengers resulting from the enhanced transport. Besides, it was also found that although the increase of the liquid flow rate from extremely low rate to a moderate one caused the residence time to be lowered, positive contribution resulting from enhanced mass transport was more significant, leading to the improved performance. However, too high liquid flow rate resulted in critical low residence time, which made the discharging performance worse. The feasibility of the developed micro PFC with dual photoelectrodes toward the applications of using solar energy to remove organic pollutants contained in wastewater and simultaneously generate electricity is demonstrated in this work.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Binxia Zhao,Nan Shao,Xingliang Chen,Jixian Ma,Yijia Gao,Xiaoqian Chen
As a novel photocatalyst with visible light responsiveness, Bi 2 WO 6 has excellent activity in treating wastewater containing organic pollutants and noble metals. However, its photocatalytic action is limited due to the rapid recombination of photogenerated electrons and holes. Based on the study of Bi 2 WO 6 , a type Ⅱ heterojunction photocatalyst (WO 3 /Bi 2 WO 6 ) and a Z-scheme heterojunction photocatalyst (CdS/Bi 2 WO 6 ) were constructed. Composites exhibited higher catalytic activity than pure Bi 2 WO 6 . The degradation efficiency of RhB(50 mg/L) and reduction efficiency of Cr(VI) (50 mg/L) by 5%WO 3 /Bi 2 WO 6 catalyst within 60 min of photocatalytic reaction was 98.82% and 53.82%, respectively. The degradation efficiency of RhB and reduction efficiency of Cr(VI) by 15%CdS/Bi 2 WO 6 catalyst was 99.52% and 69.52%, respectively. By studying the structural composition , microscopic morphology, photoelectrochemical performance, and light absorption performance of the catalysts of the two different systems. These mechanisms may help to explain the reasons for the enhanced activity of the composite photocatalysts. In addition, mixed wastewater containing organic pollutants (RhB) and heavy metal ions (Cr(VI)) was used to simulate real and complex wastewater, which provided more ideas for wastewater treatment problems.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Leikai Ye,Fangyan Chen,Yubin Tang,Wenqian Sun,Yanhua Song
At present, the rapid, sensitive, and highly selective detection of trace organic contaminants is a research spot in the field of environment. Herein, a novel fluorescent nanoprobe N, S-CDs@MIP based on N/S co-doped carbon quantum dots (CDs) coupled with amoxicillin molecularly imprinted polymer was synthesized. The fluorescent property of N, S-CDs@MIP and fluorescence quenching level of amoxicillin to N, S-CDs@MIP was explored. Furthermore, the fluorescence analysis method based on N, S-CDs@MIP probe for quantitatively detecting amoxicillin was established. The synthesized N, S-CDs@MIP has a maximum fluorescence emission wavelength of 440 nm and a significantly selective fluorescence response toward amoxicillin with a large imprinting factor of 4.07. For the developed fluorescence analysis method, the detection limit, the linear range of the standard curve, and relative standard deviation (RSD) were obtained as 1.17 ng/mL, 5.8–200 ng/mL, and <3 %, respectively. The real environmental water samples were measured with a high accuracy with the recovery of 83.6 % ~ 104.7 % and RSD of 2.3 % ~ 5.1 %. Compared to the HPLC-UV, HPLC-MS, and the fluorescence detection method based on CDs or doped CDs, the established fluorescence detection method exhibits high selectivity, wide linear range, and low detection limit. It is greatly promising in the quick detection of trace amoxicillin.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-10
·
IF 5.3
Liu Hao,Sun Xuyuan,Dai Zhengyuan,Wang Ying,Li Li,Fan Jie,Ding Yaping
Nifedipine (NIF), as one of the dihydropyridine calcium channel blockers, is widely used in the treatment of hypertension. However, misuse or ingestion of NIF can result in serious health issues such as myocardial infarction, arrhythmia, stroke, and even death. It is essential to design a reliable and sensitive detection method to monitor NIF. In this work, an innovative molecularly imprinted polymer dual-emission fluorescent sensor (CDs@PDA-MIPs) strategy was successfully designed for sensitive detection of NIF. The fluorescent intensity of the probe decreased with increasing NIF concentration, showing a satisfactory linear relationship within the range 1.0 × 10 −6 M ~ 5.0 × 10 −3 M. The LOD of NIF was 9.38 × 10 −7 M (S/N = 3) in fluorescence detection. The application of the CDs@PDA-MIPs in actual samples such as urine and Qiangli Dingxuan tablets has been verified, with recovery ranging from 97.8 to 102.8% for NIF. Therefore, the fluorescent probe demonstrates great potential as a sensing system for detecting NIF. Graphical abstract
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