CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoqian Song,Qianyi Guo,Zhenlu Cai,Jianrong Qiu,Guoping Dong
Carbon quantum dots (CQDs) with multi-color emission are synthesized through hydrothermal method by varying the ratio of citric acid (CA) and urea, the solvent (water, ethyl alcohol, and dimethylformamide), the hydrothermal temperature, and reaction time. The CQDs emit bright fluorescence which can be gradually tuned from blue to red continuously, almost covering the whole visible spectrum. The emission peaks of the CQDs shift from 450 nm to 650 nm with the surface groups and structures changing. Importantly, all solid state CQDs@SiO 2 nanophosphors are successfully synthesized by reversed-phase micromulsion method. Based on these solid state phosphors, multi-color CQDs@SiO 2 phosphors-based light-emitting diodes (LED) and white light-emitting diode (WLED) with a Commission Internationale de L’ Eclairage (CIE) value of (0.3497, 0.3045) are fabricated in a low-cost, environment-friendly way.
研究领域:
材料科学
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光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
He Mei,Jingcheng Huang,Guixin Wang,Kun Chen,Huili Wang,Xuedong Wang,Wenwei Wang
Herein, we engineered a novel pH-responsive ratiometric assay by virtue of the composite system of Ce 3+ -enhanced glutathione-encapsulated copper nanoclusters (GSH-CuNCs-Ce 3+ ) and N-doped carbon quantum dots (N-CQDs). The GSH-CuNCs-Ce 3+ and N-CQDs were fabricated using one-pot chemical reduction and hydrothermal approaches, respectively, and their morphologies as well as physical and chemical properties were testified in detail by a series of characterization techniques. At 350 nm excitation wavelength, the GSH-CuNCs-Ce 3+ /N-CQDs system (GCC-NC) featured the 440/650 nm dual-emitting property. The ratios of fluorescence intensities (F 650 /F 440 ) demonstrated a strong pH-dependence from 3.0 to 5.0 with a coefficient of determination of 0.9982. Consequently, the GCC-NC system was feasible for constructing a pH-responsive dual-emitting fluoroprobe. Based on the catalytic effect of acetylcholinesterase on acetylcholine to yield acetic acid and further trigger varying solution pH, the as-constructed GCC-NC fluoroprobe was satisfactorily applied for detecting malathion . Under optimized conditions, the newly developed GCC-NC fluoroprobe supplied a wider linear range (0.25–200 μM), lower detection limit (0.075 μM), satisfactory recoveries (96.3–106.2%) and higher precision for malathion in several kinds of fruit juice samples. The fortified experiments by malathion’s structural analogues and metal ions provided compelling evidence that this fluoroprobe had strong anti-interference capacity and high specificity for malathion. These findings render us to believe that the as-constructed pH-responsive dual-emitting fluoroprobe holds great promise in trace malathion assay in food matrices.
研究领域:
分析化学
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食品安全
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Qian Xu,Qian Xue,Shengmei Tan,Zhiliang Cheng,Xueqiang Qi,Chaoqun Yan
A low band gap and visible light-responsive heterogeneous Photo-Fenton catalyst of γ-Fe 2 O 3 /CQDs micron composite was prepared under the one-pot hydrothermal method. The Photo-Fenton degradation of γ-Fe 2 O 3 /CQDs towards dye solution of rhodamine B(RhB), methyl blue (MB), and methyl orange (MO) was studied comparatively with α-Fe 2 O 3 . The γ-Fe 2 O 3 /CQDs exhibited remarkable catalytic performance for various dyes and with a first-order rate ( k ) of 14 times higher than that of initial α-Fe 2 O 3 with a low concentration of H 2 O 2 of 0.049 mmol . L −1 and a wider pH range of 3.1–7.1. The microstructure of the compounds was observed by XRD, SEM, TEM, FT-IR, and XPS characterization results suggested that the γ-Fe 2 O 3 /CQDs nanocomposite was formed through the stable Fe–O–C bonds, thus, the band gap decreased, and it is more favorable for the distance of holes and electrons. The free radical trapping experiment and EPR analysis indicated that •OH and 1 O 2 were the major active species during the typical photo-Fenton reaction. What's more, the γ-Fe 2 O 3 /CQDs also exhibited good stability and magnetic properties. DFT conclusion shows that the mechanism of the potential determination step (PDS) on α-Fe 2 O 3 (220) is the cleavage of H 2 O 2 with an energy barrier of only 0.08 eV, which is 0.54 eV lower than that of OH* on γ-Fe 2 O 3 (220). Thus it can be deemed that γ-Fe 2 O 3 /CQDs perform much higher catalytic activity for the dissociation of H 2 O 2 than α-Fe 2 O 3 . This work gives a feasible and economical countermeasure of visible light Photo-Fenton dispose of dye wastewater with a recyclable magnetic γ-Fe 2 O 3 /CQDs micron catalyst.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yan-nan Wang,Jin Li,Zhenyu Yuan,Fanli Meng
An optical fiber toluene gas sensor working at room temperature is proposed based on CQDs@SiO 2 (-OH) porous film. The CQDs@SiO 2 (-OH) porous film was elaborated on the surface of the hollow core fiber (HCF) using the templating method, where the evanescent field is excited by a misaligned structure. The precursor solution formed by mixing CQDs with SiO 2 (-OH) enhances CQDs dispersion within the film, preventing aggregation and preserving active sites. Experimental results indicate that the gas-sensitive layer doped with CQDs demonstrates a sensitivity of 5.1 pm/ppm to toluene gas at room temperature, which is approximately 3.13 times greater than that of the SiO 2 (-OH) porous film. Additionally, it demonstrates a response time of 12 s and a limit of detection (LOD) of 3.9 ppm. The gas sensing mechanism is thoroughly investigated using DFT, exploring the electronic distribution of the gas-sensitive layer before and after CQDs doping and analyzing the sensitization mechanism. This study presents a novel approach for toluene gas detection at room temperature using an optical fiber sensor.
研究领域:
化学传感器
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材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Fanqing Meng,Yingling Wang,Zhen Chen,Jinglu Hu,Guang Lu,Wei Ma
The occurrence of antibiotics in water environment has drawn great concerns in recent years. In this work, CQDs@FeOOH electro-catalyst with abundant active edges was synthesized and applied to the degradation of antibiotics. About 99.6 % levofloxacin (LEVO) and 53.7 % TOC could be efficiently removed by CQDs@FeOOH after 60 min degradation. The high LEVO degradation performance of CQDs@FeOOH was demonstrated to be attributed to the high mass transfer ability and the high OH generation ability of the special needles structure. The OH was found to be the main radical for LEVO degradation, and the highest OH generation ability of CQDs@FeOOH was found to be resulted from the moderate adsorption energy of the exposed (1 1 0) facets (needles) toward OH. A possible LEVO degradation pathway has been proposed and toxicity changes during LEVO degradation were detailed investigated. This study offers an efficient method to reduce the amount and toxicity of antibiotics in water.
研究领域:
环境科学
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电催化
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zihan Tian,Shuhao Qin,Jingkui Yang,Xiao Wu,Jing Zhang,Jianxin Li,Hong Wang,Zhenyu Cui
PVDF/TiO 2 @CQDs hybrid photocatalytic thin films were prepared by ink-jet printing. The printing ink was prepared with the TiO 2 , TiO 2 (s)@CQDs (surface composite), and TiO 2 (i)@CQDs (situ doping) nanoparticles as precursors, respectively. Compared to TiO 2 (s)@CQDs, TiO 2 (i)@CQDs has a smaller particle size (about 10.01 nm) and a narrower particle size distribution (6∼14 nm), which can improve the photocatalytic effect while avoiding nozzle clogging. The PVDF/TiO 2 (i)@CQDs hybrid film exhibited a high degradation efficiency ( η ) of 93.71 % for Rhodamine B (RhB) within 150 min under visible light with a catalyst load of only 0.49 wt%. The reaction rate constant ( ks ) of the PVDF/TiO 2 (i)@CQDs film was about 4.3 times higher than that of the PVDF/TiO 2 (s)@CQDs film. The small particle size of this S-scheme TiO 2 (i)@CQDs heterostructure nanoparticle and the more effective contact interface formed between TiO 2 and carbon quantum dots (CQDs) further facilitated electron transfer and enhanced photoactivity. The firmly immobilized catalysts on the Polyvinylidene fluoride (PVDF) film substrate through Ti-F coordination bonds ensured the reusability and stability of the photocatalytic film (the η of RhB still reached 88.05 % after 10 consecutive cycles). This work provides a new strategy for the application of ink-jet printing technology in photocatalysis.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 27
·10135-10144
·
IF 5.7
Bairui Qi,Wenfang Wu,Ziyi Wang,Gengyan Liu,Zhou Li,Zhu Xiao
Chemodynamic therapy is an emerging therapeutic modality that utilizes the Fenton reaction for the production of reactive oxygen species to selectively target and kill cancer cells. In recent years, there has been a notable increase in the demand for developing nanomedicines with enhanced Fenton catalytic efficiency, self-generating H2O2 capability, and superior biocompatibility. This study focuses on the synthesis of a new nanomedicine, PLGA@carbon quantum dots-copper peroxide nanoparticles (PLGA@CQDs–CuPox NPs). The CQD nanodots exhibited the highest fluorescence intensity at an excitation wavelength of 400 nm. CuPox nanodots exhibited superior Fenton catalytic performance at a pH value of 5.5. In vitro experiments demonstrated that PLGA@CQDs–CuPox NPs achieved a killing rate of over 85% for tumor cells while showing a lower killing rate of 10% for normal cells. Upon entering tumor cells, PLGA@CQDs–CuPox NPs underwent degradation, releasing CQDs and CuPox nanodots. CQD nanodots emitted fluorescence, whereas CuPox nanodots decomposed to initiate a Fenton-like reaction. Through the enhanced permeability and retention effect, these nanoparticles penetrated deeper into the tumor cells, enabling deep-seated chemodynamic therapy. Uptake experiments further demonstrated that PLGA@CQDs–CuPox NPs escaped from lysosomes and entered the cell nucleus, utilizing the fluorescence changes of CQD nanodots to determine the optimal treatment time. The design of PLGA@CQDs–CuPox NPs offers a novel approach for precise cancer diagnosis and effective treatment through fluorescence imaging-guided chemodynamic therapy based on tumor microenvironment responsiveness.
研究领域:
纳米技术
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生物医学工程
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癌症研究
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yanqing Cong,Qiuang Zheng,Xiaoran Wang,Xinyue Li,Qiuyu Zheng,Shi-Wen Lv
It is of great significance for a clean energy system to develop novel non-noble catalysts toward the alkaline hydrogen evolution reaction (HER). Herein, CQDs-doped Ni(OH) 2 nanosheets generated on nickel foam were fabricated by a feasible method using Ni-MOF as precursor. Notably, the alkali etching treatment can open the spatial structure of Ni(OH) 2 and expose more active sites, thereby improving the electrocatalytic active surface area . Meanwhile, introduced CQDs can be acted as the charge carrier and accelerate the charge transfer. As a result, the Ni(OH) 2 -CQDs nanosheets showed excellent electrocatalytic performance in HER under alkaline condition, and an overpotential of 101 mV for OER over Ni(OH) 2 -CQDs/NF electrode can be realized at a current density of 10 mA/cm 2 . More significantly, embedding CQDs can effectively boost the photocatalytic activity of Ni(OH) 2 . Thus, light radiation can enhance the performance of Ni(OH) 2 -CQDs/NF electrode in HER, and the overpotential of Ni(OH) 2 -CQDs/NF electrode for HER can reduce to 90 mV under light irradiation . Furthermore, the Ni(OH) 2 -CQDs/NF electrode displayed great HER stability, and the possible mechanism of photo-assisted electrochemical HER was also proposed. All in all, current work will share some valuable insights into preparation and application of catalysts in HER.
研究领域:
材料科学
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能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xueying Zhang,Yonggang Liu,Yunpu Zhai,Yonghao Yu,Yaxin Guo,Shiduo Hao
Herein, we report a novel Cu 2 (OH) 3 F/CQDs-BiVO 4 composite photo-Fenton-like system, which used BiVO 4 and Cu 2 (OH) 3 F as electron donor and acceptor, respectively, and achieved efficient electron transfer between them through the electron bridging effect of Carbon quantum dots (CQDs). The material exhibited excellent ciprofloxacin (CIP) removal efficiency in the photo-Fenton-like coupled system. Cu 2 (OH) 3 F/CQDs-BiVO 4 had an incredibly fast response rate, eliminating 98.1% of CIP from the solution in just 1 h, according to the reaction kinetics. Exploratory tests proved that the catalyst kept up a sufficient level of activity across a wide pH range of 3–11 and in the presence of various anions. The activity, morphology, and crystal structure of the samples did not appreciably alter after five recycles. Finally, a possible reaction mechanism was also proposed based on the band structure, position and reaction species.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 57
·33238-33245
·
IF 3.049
Zhi Li,Guangbo Che,Wei Jiang,Lihui Liu,Hairui Wang
In the present study, a novel photocatalyst, CQDs@MIL-125(Ti) (CQDs = carbon quantum dots), was prepared via a solvothermal procedure. The photocatalytic properties were tested by the degradation of tetracycline (TC) with a 250 W Xe lamp (λ > 420 nm). Compared with pure MIL-125(Ti), the 10 wt% CQDs@MIL-125(Ti) photocatalyst can significantly improve the degradation process of TC, and the degradation efficiency can reach 90% within 4 h. The enhancement in the photocatalytic performance is due to the CQDs, which can promote the absorption of visible light and also efficiently accelerate the separation of photogenerated electron–hole pairs. We have also demonstrated that superoxide radicals (·O2−) and holes (h+) play crucial roles in the photocatalytic degradation of TC through capture experiments. The current work provides a new idea for constructing high-efficiency photocatalysts based on MIL-125(Ti).
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
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
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Erqiao Chen,Zhihao Chen,Zhongting Liu,Mingzhu Zhou,Bisheng Li,Renjie Li,Liguo Shen,Yang Jiao,Hongjun Lin,Yanchao Xu
Membrane fouling and the inherent permeability–selectivity trade-off represent persistent dual challenges constraining the long-term performance and practical application of nanofiltration (NF) membranes. Saline wastewater and dye-containing effluents are typical industrial wastewaters with large discharge volumes, where high salt contents and complex organic components exacerbate fouling and intensify the permeability–selectivity dilemma of conventional NF membranes. In this work, we report a novel magnetic-field-assisted interfacial polymerization strategy to fabricate photocatalytic thin-film nanocomposite (M-TFN) membranes with enhanced antifouling and self-cleaning performance. A multifunctional nanostructure, Fe 3 O 4 @CdS@CQDs, was synthesized via a one-pot hydrothermal method and introduced into the aqueous phase of interfacial polymerization. Under an external magnetic field, the nanoparticles were guided toward the water–organic interface, inducing the formation of a wrinkled polyamide surface with increased roughness, hydrophilicity, and specific surface area. Compared with the conventional TFC (6.1 L·m −2 ·h −1 ·bar −1 , 98.2 % Na 2 SO 4 rejection) and TFN membranes (15.7 m −2 ·h −1 ·bar −1 , 99.0 % Na 2 SO 4 rejection), the resulting M-TFN membranes exhibited a significantly improved water flux of 22.5 m −2 ·h −1 ·bar −1 while maintaining a high Na 2 SO 4 rejection of 99.2 %, thereby effectively overcoming the permeability–selectivity trade-off. Moreover, the membranes demonstrated excellent dye rejection (>95 % for multiple organic dyes) and outstanding photocatalytic self-cleaning behavior under visible light, achieving a flux recovery rate of 98.7 % after five fouling–cleaning cycles. This study provides new insights into the synergistic use of magnetic guidance and photocatalytic enhancement to design next-generation NF membranes for advanced wastewater treatment.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
膜分离
·
光催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）