JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Yanning Qu,Xinyang Li,Hengli Zhang,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
Multifunctional photocatalytic surfaces for pollutant degradation and antimicrobial application are often in high demand, however they confront many challenges in charge transfer and light capture ability. In this work, a sponge-like N,S-CQDs/Bi 2 MoO 6 @TiO 2 film was constructed via hydrothermal technique aiming to solve above problems. As a result, the ternary film showed enhanced photocatalytic efficiency under visible and near-infrared (NIR) light, in which 85.8% and 44.6% of ciprofloxacin (CIP) were degraded after 240 min irradiation with visible and NIR light, respectively. Moreover, the composite film effectively realized photocatalytic sterilization of gram-positive B. subtilis and gram-negative E. coli under visible light irradiation. The bacterial colony decreased significantly from 7.56-log to 1-log cfu/mL after adding the ternary film within 1.5 h. The enhanced photocatalytic efficiency was closely related to both introduction of surface-functional N,S-CQDs and the construction of N,S-CQDs/Bi 2 MoO 6 @TiO 2 Z-scheme system, in which the transfer efficiency of photoinduced carriers and the light absorption property were significantly improved. We consider that the N,S-CQDs/Bi 2 MoO 6 @TiO 2 film is promising for the degradation of refractory pollutants and antimicrobial application under visible/NIR light irradiation. The relatively convenient recycling property and excellent photocatalytic performance of the N,S-CQDs/Bi 2 MoO 6 @TiO 2 film are beneficial for industrial applications.
研究领域:
环境科学
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材料科学
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微生物学
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DOI
PubMed
高影响因子
SOLID STATE SCIENCES
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2023
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IF 3.5
Huadong Liu,Hao Sun,Du Ke Zhen,Cheng Jing liang,Sun XiaoYu
Monoclinic bismuth vanadate (m-BiVO 4 ) is a well-known photocatalytic material. However, its poor charge transport and photogenerated electron hole rapid recombination limit the application of m-BiVO 4 . In this paper, we successfully constructed a novel copper-sulfur co-doped carbon quantum dots (Cu, S-CQDs)/BiVO 4 nanocomposite through a facile and efficient route, which significantly improved the photocatalytic performance of BiVO 4 . The physicochemical properties of Cu, S-CQDs and Cu, S-CQDs/BiVO 4 samples were studied by various characterization. It was concluded from the degradation experiments that the photocatalytic degradation rate of rhodamine B reaches 99% in 60 min under natural light. The degradation curve compounds the quasi-primary kinetic model, and the kinetic coefficient of degradation is 0.07831 min −1 , which is 5.37 times than that of pure BiVO 4 . Moreover, the free radical scavenging experiments reveal that the hole and superoxide radicals play a major role in the photocatalysis process. After four cycles, the activity of photocatalyst exhibits high stability, which is extremely important for the photocatalytic process. In the summery, the prepared Cu, S-CQDs/BiVO 4 has many advantages, such as environmental-friendly, low cost and a wide range of applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Huadong Liu,Hao Sun,XiaoYu Sun,Jing liang Cheng
This paper presents a novel tubular microreactor immobilized a photocatalyst to overcome the limitations of low light utilization and the challenges associated with catalyst recovery in traditional photocatalysis reactors. The copper-sulfur co-doped carbon quantum dots (Cu, S-CQDs)/bismuth vanadate (BiVO 4 ) composites were successfully immobilized on the inner surface of the microreactor channel through the sol–gel process. The catalytic layer in the microreactor enlarged the specific surface area and facilitated the mass transfer. Meanwhile, it also greatly reduced the consumption of chemical supplies and eliminated the need for recycling the photocatalyst. The morphology and structural features of the catalytic layer were studied by characterization. Then the photocatalytic performance of the microreactor was evaluated by photocatalytic degradation of Rhodamine B. The photocatalytic kinetics of the photocatalytic reaction in the microreactor was 0.60925, which was 10.49 times greater than that in the macroscopic system. The results showed that the microreactor led to a significant improvement in degradation efficiency. The reproducibility experiments conducted on the microreactor system further demonstrate its excellent stability. In short, integrating the beneficial properties of microreactors with Cu, S-CQDs/BiVO 4 exhibits highly promising prospects of photocatalytic applications.
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
NANOTECHNOLOGY
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2023
·Vol. 34
·期 39
·395503
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IF 3.5
Zhiwen Li,Zhilin Zhou,Jianghua Wang,Tingxian Tao,Yingqiang Fu
Carbon quantum dots (CQDs) have been extensively researched as fluorescent probes, but there are few reports on fluorescence-enhanced probes. Herein, nitrogen and sulfur co-doped CQDs (N, S-CQDs) with blue aggregation-induced emission enhancement (AIEE) fluorescence were synthesized by a one-step hydrothermal reaction. N, S-CQDs can rely on the presence of –OH, C=O, –NH2, and ether bonds on their surfaces and the formation of hydrogen bonds by ciprofloxacin (CIP) containing Ar-F and –COOH functional groups to achieve effective charge transfer. In addition, CIP forces N, S-CQDs to aggregate to form cross-linked structures, which effectively limits the vibration and rotation of N, S-CQDs, leading to enhanced fluorescence of N, S-CQDs. Based on the above intermolecular charge transfer and AIEE between N, S-CQDs and CIP, an efficient and sensitive nano fluorescent probe for the detection of CIP in real water samples was developed, which can achieve sensitive detection of 3.33 × 10−8–1.13 × 10−6 M CIP.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Fangjun Jia,Haitao Li,Zimin Liu,Qi Gong,Hong wen Luo,Xin Ma,Jiating Hao,Hao Pan
This study innovatively synthesized yellow-green fluorescent sulfur-doped carbon quantum dots (S-CQDs) tracers and systematically investigates their transport and retention behaviors in sandstone reservoirs. By optimizing hydrothermal synthesis parameters, S-CQDs with uniform particle size and outstanding fluorescence properties were successfully prepared. Experimental evaluations demonstrated the stability of S-CQDs under extreme reservoir conditions, including high temperatures (up to150℃) and extreme pH values(3−10), as well as their interaction mechanisms with sandstone minerals. The findings indicate that S-CQDs tracers exhibit excellent transportability and long-term stability in sandstone formations, with their transport and retention behaviors governed by multiple factors, including particle size, concentration, flow rate, salinity, and clay mineral content. This study provides critical experimental data and theoretical insights for the application of CQDs as tracers in oil and gas reservoirs, highlighting their significant potential for subsurface fluid monitoring and hydrocarbon exploration.
研究领域:
石油工程
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地球化学
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纳米技术
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环境科学
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储层表征
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高影响因子
MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Jing Cao,Mengmeng Chen,Miao Wang,Yongxin She,Ying Han,Shiyao Fu,Xin Yang,Jing Wang
A ratiometric enzymatic fluorescence biosensor for OP detection was developed. • Recombinant carboxylesterase PvCarE1 enhances stability and reproducibility over conventional AChE. • Dual-excitation N,S-CQDs enable self-calibrated and robust signal output. • Satisfactory recoveries (82.0%–109.9%) in eight food matrices. • Results agreed well with LC-MS/MS, supporting practical food analysis. The widespread use of organophosphorus pesticides (OPs) poses significant threats to food safety and environmental health, necessitating the development of robust and sensitive detection platforms. We present a novel ratiometric biosensor based on a recombinant carboxylesterase (PvCarE1) integrated with dual-excitation nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs). The sensing mechanism relies on an inner filter effect (IFE), where the enzymatic hydrolysis product ( p -nitrophenol) selectively quenches 370 nm-excited fluorescence, while 255 nm-excited emission remains less affected. OP inhibition reduces p -nitrophenol generation, yielding a dose-dependent F₃₇₀/F₂₅₅ response that provides intrinsic self-calibration. The biosensor exhibited high sensitivity for dichlorvos, trichlorfon, and profenofos with detection limits of 0.07, 0.38, and 0.45 μg/L, respectively. Successful application in eight representative fruit and vegetable samples yielded satisfactory recoveries of 82.0%–109.9% with RSDs of 0.4%–11.9%, confirming its potential for real-world food safety monitoring. Download: Download high-res image (57KB) Download: Download full-size image
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高影响因子
危险品化学品经营许可证（带存储）