ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jie Han,Juncheng Wu,Shengqin Guan,Ran Xu,Juan Zhang,Jianlong Wang,Taotao Guan,Zhichang Liu,Kaixi Li
The construction of bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is significant for developing water splitting technology. The carbon-based non-noble metal catalysts could be regarded as a preferred alternative to Pt-based materials in water splitting, but very rarely Pt-like activity has been obtained by non-noble metal catalysts. Herein, NCQDs/CoMoP/NF bifunctional catalysts were designed and synthesized by the coupling relationships between N-doped carbon quantum dots (NCQDs) and metal ions . The abundant functional groups on the surfaces of CQDs can effectively coordinate with metal ions with empty d orbitals to generate the stable composites. Meanwhile, the formation of metal nanoparticles can be restricted by the introduction of CQDs to form smaller crystals with stable nanostructures , thereby preventing the agglomeration and further growth of metal nanoparticles . The NCQDs-100/CoMoP/NF electrode shows a low overpotential of 65 mV (10 mA cm −2 ) for HER and 370 mV (100 mA cm −2 ) for OER in a 1.0 M KOH system. Furthermore, the constructed NCQDs-100/CoMoP/NF couple can reveal a small cell voltage of 1.75 V to reach the large current density of 50 mA cm −2 .
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Chenyang Shu,Chaozhong Guo,Xinru Xu,Lingtao Sun,Yao Liu,Hongdian Chen,Chuanlan Xu,Rong Jin,Yujun Si,Haifeng Chen
Designing micropore-rich carbon materials with large specific surface area (SSA) as a carbon-based oxygen reduction reaction (ORR) electrocatalyst is still frontier but remains challenging in catalysis of zinc-air batteries. Here we propose a new strategy for synthesis of nitrogen atoms co-doped carbon sheets and carbon quantum dots (N-C@CQDs) with an SSA of 1485.3 m 2 g −1 and 98.8 % micro-porosity from α-cellulose via using a complex salt (ZnCl 2 -NH 4 Cl) with low eutectic point (179 °C) as a pore regulator and K 2 FeO 4 as a graphitization catalyst, which can serve as an active and stable carbon-based ORR electrocatalyst. The role of K 2 FeO 4 not only promotes graphitization but also oxidizes the large-sized graphitic carbon particles into a huge amount of uniformly distributed CQDs. This catalyst has exhibited a comparable ORR activity and superior stability to the Pt/C, but a Zn-air battery assembled with the former has delivered a higher peak power density (214 mW cm −2 ) and a larger gravimetric energy density (ED) of (959 Wh k g Z n - 1 ), especially in which it also displays an outstanding catalytic durability with 98.7 % ED retention during a ∼110 h continuous discharge. This work provides a new pathway for design of high-performance carbon-based ORR catalysts in various energy devices.
研究领域:
材料科学
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电化学
·
催化科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Minghan Wan,Bing Xu,Lei Shi,Tian Zhou,Nianben Zheng,Zhiqiang Sun
Nanofluids-based direct absorption solar collectors are promising candidates for medium–high-temperature solar energy harvesting . However, nanofluids’ complicated preparation process and undesirable high-temperature stability have hindered their practical applications. Herein, we propose a facile method for synthesizing gold/carbon quantum dots (Au-CQDs) nanofluids by directly carbonizing the base fluid and spontaneously assembling with Au nanoparticles (AuNPs) triggered by high temperatures. The results indicate that the self-assembled Au-CQDs nanofluids can maintain high stability at 110 °C for 100 h without precipitation and keep excellent photothermal conversion performance under 10 sun irradiation. The concentration and particle size of AuNPs are crucial factors affecting the self-assembly process. By modulating the microscopic morphologies of the self-assembled nanoparticles , the extinction coefficient of the prepared nanofluids is up to 88.7 % at a low loading of 30 ppm. The nanofluids can reach an equilibrium temperature of 50 °C under 1 sun irradiation, 10.4 °C higher than the base fluid due to the enhanced plasmonic effects and stability resulting from the CQDs dotted AuNPs. This work offers a new strategy to fabricate highly stable nanofluids with excellent light absorption properties for efficient solar thermal applications.
研究领域:
材料科学
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能源工程
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Li Sun,Yuhao Xing,Chenxu Liu,Zhe Wang,Yi Jiang,Tiehong Song
To overcome the limitations of high energy consumption and low selectivity in conventional antibiotic treatment methods, this study developed a sodium percarbonate (SPC)-activated piezoelectric-photocatalytic system using a nitrogen-doped carbon quantum dot/molybdenum disulfide (N-CQDs/MoS₂) composite to degrade oxytetracycline (OTC). The catalyst was synthesized via a hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), piezoresponse force microscopy (PFM), and electrochemical analysis. Results showed that nitrogen-doped carbon quantum dots significantly enhanced the piezoelectric and photocatalytic performance of MoS₂. Reaction conditions were optimized using response surface methodology (RSM), determining the optimal parameters as OTC concentration of 10.68 mg/L, catalyst dosage of 0.46 g/L, and SPC dosage of 0.21 g/L. Under these conditions, a degradation efficiency of 99.52% was achieved within 25 minutes, closely matching the experimental result of 99.18%. The degradation kinetics followed a quasi-first-order model (k = 0.0752 min⁻¹), confirming the model’s reliability. Radical scavenging experiments and electron paramagnetic resonance (EPR) analysis identified h⁺, •OH, and O₂•⁻ as the main reactive species. Ecotoxicity assessment showed low toxicity of the degradation products, indicating good environmental safety. The catalyst maintained a high degradation efficiency of 96% after five cycles, demonstrating excellent stability and reusability.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Haiyi Jin,Wangyi Zhou,Zhenyu Guo,Hailiang Xu,Xiaoli Zhong,Tai-Shung Chung,Die Ling Zhao,Hongjun Lin
The escalating presence of antibiotics and antibiotic-resistant bacteria in wastewater poses a pressing threat to both human health and ecosystems. Addressing this challenge requires innovative approaches while photocatalytic membranes emerge as promising solutions because they offer multiple functions to separate and degrade/sterilize antibiotics and antibiotic-resistant bacteria simultaneously. In this study, we for the first time developed in-situ grown Ni-Fe metal-organic framework/carbon quantum dot (NiFe-MOF/CQD) membranes with NiFe-MOF seeds pre-integrated into the substrates. The incorporation of CQDs not only enhances the hydrophilicity and integrity of NiFe-MOF membranes that results in both a high water flux of 119.7 L m −2 h −1 bar −1 and a high antibiotic rejection of 98.1% to rifampicin, but also promotes the photo-Fenton activity by enhancing the visible light absorption and photoelectrons (e − )-holes (h + ) separation. Therefore, the degradation efficiency of rifampicin in a photo-Fenton system within 100 min by NiFe-MOF/CQD composites (84.9%) surpasses that of NiFe-MOFs (63.1%). Additionally, NiFe-MOF/CQDs can effectively inactivate both Gram-negative and Gram-positive bacteria in the photo-Fenton system. The supreme separation performance of NiFe-MOF/CQD membranes and photo-Fenton activity of NiFe-MOF/CQDs underscore the significant potentials of the newly invented photocatalytic membranes in treating wastewater containing antibiotic and antibiotic-resistant bacteria.
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
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Jiaqi Guo,Fangliang Gao,Dongyang Li,Xingjun Luo,Yiming Sun,Xingfu Wang,Zhilin Ran,Qibao Wu,Shuti Li
Self-healing materials arouse much attention because of their recoverable morphologies during (dis)charge. Herein, we report an effective and practical synthesis strategy that can adequately utilize the self-healing feature to achieve advanced integrative performance. The hollow Ga2O3@nitrogen-doped carbon quantum dot (H-Ga2O3@N-CQD) nanospheres are synthesized via a facile approach as an anode material for lithium-ion batteries (LIBs). In this anode, the self-healing capability is derived from the Ga generated in the conversion reaction. On account of the feasible structure design and the binding N-CQD coating, the material structure can be well preserved during (dis)charging. As a result, the anode material delivers an initial discharge capacity of 1348.5 mAh g–1 at 0.1 A g–1 and an invertible capacity of 700.5 mAh g–1 under 0.5 A g–1 after 500 cycles. Endowed by the unique structural design, the H-Ga2O3@N-CQDs can deliver high-current-density circulation performance and long-term cycle stability, which has prospects for large-scale applications in high-energy-density LIBs. Meanwhile, the rational framework design offers new insights into the structure-building construction of self-healing materials.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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功能材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 50
·108538-108552
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IF 5.8
Wang Yongqiang,Bai Yibo,Han Che,Li Zaimei,Lun Xiaowen,Zhang Conglu
Graphite-like carbon nitride (g-C 3 N 4 ) is favored for its excellent physicochemical properties. However, the high complexation rate of photogenerated carriers greatly limits its practical applications. Based on this, a novel CQDs-doped carbon nitride nanosheets composite (CNS/CQDs) was prepared and applied to the visible light–induced activation of peroxymonosulfate (PMS) for meloxicam (Mel) and tetracycline (TC) degradation. The photocatalytic degradation of Mel and TC were remarkably promoted in the CNS/CQDs+PMS+vis system. Mel photodegradation of 99.90% was achieved over 30 min with 20 mg CNS/CQDs and 20 mg PMS at pH11. And TC photodegradation of 95.97% was achieved over 45 min with 20 mg CNS/CQDs and 20 mg PMS at nature pH6.5. The TOC mineralization rates of Mel and TC were 75.49% and 52.00%, respectively. The transient photocurrent response and electrochemical impedance measurements (EIS) results indicated that the doping of CQDs could improve the charge transfer efficiency of pure g-C 3 N 4 , and CNS/CQDs had a low charge transfer resistance. Capture experiments and EPR tests explored the effective actives in the CNS/CQDs+PMS+vis system. Possible degradation pathways of Mel were also analyzed. This study provides valid residual drugs degradation under the dual conditions of visible light catalytic oxidation and persulfate oxidation, which will be a novel perspective for advanced oxidation technology to effectively remove organic pollutants from water.
研究领域:
环境科学
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光催化化学
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水处理技术
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纳米材料
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高级氧化工艺
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药物代谢
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环境污染物降解
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Jianhui Liu,Peipei Chen,Fangquan Xia,Zhen Liu,Hanbiao Liu,Jiangle Yi,Changli Zhou
A "signal on" aptasensor was fabricated for chlorpyrifos detection by a highly efficient electrochemiluminescence resonance energy transfer (ECL-RET) strategy between MoS 2 /CdS nanospheres and silver/carbon quantum dots (Ag/CQDs). Compared with the conventional MoS 2 /CdS nanosheets, the MoS 2 /CdS nanospheres have a larger specific surface area and electron density, which makes the catalytic effect on K 2 S 2 O 8 stronger and has higher luminescence intensity. As a receptor, through the synergistic effect of Ag NPs and CQDs, it has a very wide absorption band between 300 and 600 nm. The absorption band and the emission spectrum of MoS 2 /CdS completely overlap, and the high quantum yield of Ag/CQDs can achieve efficient energy resonance transfer. The proposed ECL aptasensor provided a linear range from 10 nM to 1.0 fM for chlorpyrifos detection and the detection limit of 0.35 fM (S/N = 3) under optimal experimental conditions. The method was successfully applied to the detection of chlorpyrifos in fruit and vegetable samples with satisfactory results.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
Photodiagnosis and Photodynamic Therapy
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2022
·
IF 3.577
Baolei Liu,Yutian Su,Shishan Wu,Jian Shen
Pathogenic bacteria-infected wound healing faces challenges even though many advanced antibiotics and antibacterial nanoagents have been developed. Herein, we established a two-dimensional antibacterial nanoplatform with synergistic photothermal therapy (PTT) and photodynamic therapy (PDT) antibacterial capabilities mediated by a single 808 nm laser irradiation. The nanoplatform is constructed by combining black phosphorus (BP) obtained by liquid phase exfoliation and hydrothermally prepared tellurium-doped carbon quantum dots (CQDs) prepared by electrostatic interaction. As a result, the photothermal conversion of BP and hydroxyl radical ( ‧ OH) production of CQDs under NIR laser makes the nanoplatform ( [email protected] ) possess an outstanding antibacterial performance against S. aureus and E. coli (as high as 92.7% and 98.4%, respectively), resulting in a faster wound closure ratio than another infected wound. Moreover, in vitro and in vivo researches showed that [email protected] have good hemocompatibility, cytocompatibility, and biocompatibility during the therapeutic process. This work demonstrates the broad application prospect of BP nanosheets in infectious microenvironments and develops a potential strategy for S. aureus-infected wound repair.
研究领域:
纳米技术
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生物医学工程
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Hongwei Ren,Hongyu Dong,Tengda Zhao,Zhongqing Yan,Benzhen Jia,Liang Han,Jinfeng Zhang
Activated carbon (AC) is one of the typical adsorbents for industrial treatment of VOCs, but AC itself has a high calorific value. When the heat generated by low-temperature oxidation cannot be released, it is easy to store heat and oxidize spontaneously, resulting in immeasurable harm. Therefore, it is important to study and improve the thermal stability of AC. In this study, Mo-doped carbon quantum dots (CQDs) was synthesized to enhance the safety of AC usage. The structure of AC before and after modification was characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffractometer (XRD). On the modified Mo-doped CQDs/AC, there are more crystalline structures formed by Mo oxides on the surface, which makes the intermolecular force on the surface of AC increase. At the same time, Mo oxide has strong oxidation resistance, which can inhibit the thermal decomposition process of AC, and has stronger stability. The spontaneous combustion tendency and thermal hazard of AC before and after modification were greatly improved. The heat released in the toluene adsorption by the modified AC at different temperatures was significantly lower than the heat released by the unmodified AC. According to the Langmuir adsorption isotherm, the adsorption performance of Mo-doped CQDs (2.5 wt%) was 1.6 times higher than that of AC when the system was 25 °C. The results showed that Na 2 MoO 4 CQDs modified AC could effectively improve the thermal stability and greatly reduce the spontaneous combustion tendency. A relative fire safety performance evaluation model was also established to comprehensively evaluate the fire risk of VOCs treatment by AC.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Die Ling Zhao,Haiyi Jin,Qipeng Zhao,Yanchao Xu,Liguo Shen,Hongjun Lin,Tai-Shung Chung
The surface chemistry and functionality of metal-organic frameworks (MOFs) can be manipulated through a judicious choice of integration with other nanomaterials . In this work, heterojunctions of UiO-66-NH 2 and carbon quantum dots (CQDs) were prepared to explore their synergetic advantages as nanofillers in thin-film nanocomposite (TFN) membranes for dye removal. The successful integration of UiO-66-NH 2 /CQD were verified by TEM , FT-IR and XPS . The uniform loading of ultra-small CQDs on the surfaces of UiO-66-NH 2 can not only enhance their compatibility with the polyamide matrix, but also promote their photocatalytic oxidation under visible light. Therefore, comparing to the pristine thin-film composite membranes , the optimal TFN membranes embedded with 0.2 wt% of UiO-66-NH 2 /CQD have demonstrated remarkable improvements in pure water permeance by 89.7% and higher selectivity to dyes of different charges and molecular weights. In addition, the decrease of water flux caused by dye adsorption during the long-term filtration process can be recovered by 92–99% via photocatalytic degradation of the attached dyes within 10 min. This work may offer a new strategy for fabricating defect-free and self-cleaning nanofiltration membranes for dye removal and wastewater reclamation.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Nan Xu,Ting Pu,Lei Chen,Qin Yang,AnYuan Tong,FuBin Chen,ChunYan Yang
Herein, nitrogen-doped carbon quantum dots (N-CQDs) were synthesized by a solvothermal reaction for the determination of tartrazine in food. The microscopic structures and optical properties were examined by high resolution transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, Fourier-transform infrared and ultraviolet-visible absorption spectroscopy. The fluorescence emission of the N-CQDs were 450 nm upon the excitation of 350 nm with a quantum yield of 14%. The N-CQDs provide a good linear range from 0.8 to 100 μM and low detection limit of 0.078 μM. The constructed fluorescent probe was successfully adopted to determine tartrazine in food samples with good accuracy. The fluorescence quenching mechanism of tartrazine by the N-CQDs are likely due to the static quenching and inner filter effect. Overall, a wide linear range, sensitive and stable fluorescent probe is provided which indicates a new method for the determination of tartrazine.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 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）