CHEMICAL PAPERS
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2022
·Vol. 77
·期 1
·207-217
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IF 2.146
Li Hongxia,Liu Yongdong,Gao Xiang,Niu Xiaohui,Fan Haiyan,Wang Kunjie
Using chitosan as raw material, a composite-featured chitosan/Ag 2 S/carbon quantum dot (CS/Ag 2 S/CQDs hydrogels) was synthesized by successfully uploading carbon quantum dots (CQDs) and silver sulfide (Ag 2 S). According to the SEM and TEM characterization of the material, the hydrogel material has a rich pore-like structure, which can absorb wound tissue fluid and promote wound healing. Staphylococcus aureus (Gram-positive), Escherichia coli (Gram-negative) and methicillin-resistant Staphylococcus aureus were used as model bacteria to test the antibacterial effect of CS/Ag 2 S/CQDs. This material not only has excellent inhibitory effect on common bacteria (the inhibitory rate of E. coli and S. aureus is 86% and 67%, respectively), but also has good inhibitory effect on drug-resistant bacteria (the inhibitory rate of MRSA is 73%). The bacterial toxicity test showed that CS/Ag 2 S/CQDs hydrogel had low toxicity. Meanwhile, CS/Ag 2 S/CQDs hydrogels degraded 28.39% of the hydrogels during a 7 days biodegradation. Its excellent bacteriostatic and degradable properties make it a potential candidate for a new type of medical dressing for clinical application.
研究领域:
材料科学
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生物医学工程
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微生物学
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DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 43
·27709-27715
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IF 4.036
Shuiqin Chai,Lijia Zhou,Yuting Chi,Linshuo Chen,Shuchen Pei,Bin Chen
It is an urgent challenge to develop efficient antibacterial agents against resistant bacteria in the treatment of infectious diseases. Carbon quantum dots (CQDs) have attracted much attention owing to their good stability, low toxicity and excellent biocompatibility. In this work, CQDs doped with different contents of the element phosphorus (P) were prepared by a simple hydrothermal method using valine as a carbon source, triethylamine as a nitrogen source and different volumes of phosphoric acid as a phosphorus source. The average diameter and the surface charge could be regulated from 2.89 nm to 1.56 nm and +2.58 mV to +5.47 mV by increasing the content of the element P in these CQDs. Importantly, these CQDs showed effective bacterial inhibition against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The minimal inhibitory concentration (MIC) decreased from 0.71, to 0.51 to 0.18 mg mL−1 on E. coli and S. aureus with the increase of P element content. Furthermore, the morphologies of E. coli cells and S. aureus were damaged and became irregular upon treatment with these CQDs. The results of singlet oxygen (1O2) detection demonstrated that intracellular 1O2 was generated during the antibacterial process. We speculated that bacterial inhibition induced by these CQDs was accompanied by disruption of permeability and structural integrity, owing to strong electrostatic interactions between negatively charged bacteria and positively charged CQDs and production of singlet oxygen of CQDs. Together, this study indicates that the CQDs can be a candidate to treat resistant bacterial infections and may improve the understanding of killing pathogens by antibacterial CQD drugs.
研究领域:
生物医学
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材料科学
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DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Rihong Xiao,Yili Zhang,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Photocatalytic technology has the advantages of environmental friendliness, low energy consumption, and fast reaction speed, which can be applied in the field of visible light mercury removal. High stability and narrow bandgap are fundamental factors for ideal semiconductor photocatalysts. A novel method of hydrothermal synthesis of CQDs/2D-BWO composite catalyst to improve the oxidation efficiency of elemental mercury was proposed. The morphology, physicochemical properties, and optical performance of the materials were fully characterized. The experiment of Hg oxidation efficiency under visible light showed that C 2 /2D-BWO exhibited a Hg removal efficiency of was as high as 86.3 % under visible light and adequate cyclic stability. The effects of SO 2 and NO on Hg oxidation were also studied, and the reasons for the improved of photocatalytic activity of CQDs on 2D-BWO were analyzed based on DFT calculations. The reaction mechanism of the catalytic oxidation of Hg by C 2 /2D-BWO was proposed, and C 2 /2D-BWO was found to be an efficient and stable visible light catalyst.
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
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Wen-Jie Yang,Dan-Dan Shao,Zhengzhong Zhou,Qian-Cheng Xia,Jian Chen,Xue-Li Cao,Tao Zheng,Shi-Peng Sun
In this article, novel nanofiltration (NF) membranes with highly selective surface and fast water and ion transport channels were fabricated for the valorization of biogas slurry. Unlike conventional thin film composite (TFC) membranes, the novel NF membranes compose hydrophilic carbon quantum dots (CQDs) as the interlayer. The carboxyl groups from CQDs react with the polyethyleneimine (PEI), leading to the lower cross-linking degree in the interfacial polymerization layer of NF membranes. Besides, the presence of the hydrophilic CQDs can create fast water and ion transport channels in the NF membranes. The water permeability of membranes is therefore enhanced significantly from 3.6 to 9.7 LMH·bar −1 . The NF membranes were used to concentrate the amino acids from biogas slurry; it achieved rejection rates above 90% towards model amino acids such as lysine, glutamic acid and leucine, due to its highly positive electrical properties, while allowing most of the unwanted salt ions to permeate through. The excellent selectivity between amino acids and salt ions demonstrates the great potential application of the NF membranes in biogas slurry valorization.
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
ANALYTICA CHIMICA ACTA
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2019
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IF 5.256
Jinghua Shang,Minggang Zhao,Huiyan Qu,Hui Li,Shougang Chen
We proposed a new method for regulating the electrochemical signal by using Schottky barrier . The results show that the height of Schottky barrier can be altered by adsorbing charged substance to control the enhancement and attenuation of electrochemical signal. The Schottky interface formed by MoS 2 and CQDs (carbon quantum dots) can achieve the selective detection of dopamine and overcome the distraction of ascorbic acid and uric acid with similar redox signal. The combination of Schottky barrier and electrochemical detection enhance the sensitivity and selectivity of electrochemical sensor significantly. It is a new strategy for improving electrochemical detection by introducing Schottky barrier into electrochemical process.
研究领域:
电化学
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纳米材料
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传感器
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分析化学
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材料科学
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DOI
高影响因子
IONICS
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2023
·Vol. 29
·期 3
·1245-1254
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IF 2.8
Wang Kunjie,Han Sha,Liang Lei,Li Hongxia,Niu Xiaohui,Zhang Deyi,Fan Haiyan,Liu Xiaoyu
A ternary composite material containing TiO 2 , Bi 2 WO 6 , and carbon quantum dots (CQDs) was synthesized in this work. Herein, CQDs were derived from olive leaves using reflux method, and TiO 2 was loaded through hydrothermal treatment. The as-prepared composite (Bi 2 WO 6 /CQDs/TiO 2 ) showed excellent photocatalytic properties. The structure, morphology, and chemical composition of Bi 2 WO 6 /CQDs/TiO 2 were characterized using XRD, SEM, TEM, and XPS. The photocatalytic performance of the composites showed it depends on the loading rate of CQDs. The highest degradation rate of RhB (92%) was achieved at 0.5% for CQDs. UV–vis DRS, photocurrent, and PL analysis results showed that, compared to Bi 2 WO 6 and CQDs/TiO 2 binary composite, the ternary composite Bi 2 WO 6 /CQDs/TiO 2 -0.5 exhibited better visible light response, higher photogenerated carrier separation efficiency, and consequently superior photocatalytic degradation performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2025
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IF 3.5
Wang Shanshan,Zhang Kai,Taran Oxana P.,Li Siqi,Sun Fubao,Yan Hong,Li Fen
Lignin quantum carbon dots (CQDs) were prepared using basic lignin as the carbon source. They were loaded onto Z-type ZnIn 2 S 4 /WO 3 heterojunction semiconductor materials by a one-step hydrothermal method to construct a ternary composite photocatalyst. Taking the photocatalytic water hydrogen evolution reaction performance as an indicator, it was found that the 33% CQDs/ZnIn 2 S 4 /WO 3 composite photocatalyst exhibited the highest hydrogen evolution reaction rate of 15.355 mmol·h −1 ·g −1 , which was twice as high as that of ZnIn 2 S 4 /WO 3 (7.522 mmol·h −1 ·g −1 ). This study successfully constructed CQDs/ZnIn 2 S 4 /WO 3 tenary heterojunction photocatalyst with excellent and stable hydrogen production performance, which fully demonstrated the feasibility of loading lignin-based CQDs to enhance the photocatalytic performance of ZnIn 2 S 4 for high-value utilization of lignin.
研究领域:
材料科学
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光催化
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可再生能源
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纳米材料
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可持续化学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2021
·Vol. 127
·期 4
·1-10
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IF 2.584
Mao Tingjie,Yang Xiaoling,He Yingzhi,Wang Tingting,Liang Qiu,Zhang Guobang,Tong Yanhua
Reinforcing light harvesting is an effective means to improve photocatalytic efficiency of semiconductors. In this study, carbon-quantum-dot-modified BiOBr mixed with SiO 2 nanospheres (BiOBr/CQDs + SiO 2 ) were prepared via stepwise chemical precipitation route. The characterizations of X-ray diffraction, field-emission scanning electron microscopy and energy-dispersive X-ray apparatus demonstrated that the as-prepared BiOBr/CQDs + SiO 2 displayed nanosheets-building spherelike hierarchical nanostructures mixing with dispersive SiO 2 nanospheres. Control photocatalytic degradation of orange II under natural sunlight illumination indicated that the presence of SiO 2 nanospheres could further promote the photocatalytic behaviors of BiOBr/CQDs apart from CQDs. Diffuse reflection spectrum demonstrated that SiO 2 nanospheres were capable of reflecting UV − Vis light near to 100%. The possible mechanism for the enhanced light-absorption surface of suspending hierarchical photocatalyst in presence of SiO 2 nanospheres was proposed via light propagation over suspending SiO 2 nanospheres under vertical light illumination. Our method for enhancing photocatalytic efficiency provided a general method to enhance light harvesting of every suspending two- or three-dimensional photocatalysts.
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
RESEARCH ON CHEMICAL INTERMEDIATES
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2026
·
IF 3.3
Ai Hengyu,Meng Fanqi,Wang Shanshan,Taran Oxana P.,Sun Fubao,Yan Hong
Mn 0.5 Cd 0.5 S (MCS) is widely used in photocatalytic hydrogen production via water splitting. However, its inherent drawbacks, including low separation efficiency of photogenerated electron–hole pairs, poor stability, and severe photocorrosion, limit hydrogen production efficiency. In this study, carbon quantum dots (CQDs) were synthesized using alkaline lignin as the carbon source and were loaded onto the surface of MCS via ultrasonic-assisted treatment to construct CQDs/MCS composite photocatalyst. Characterization results revealed that the introduction of CQDs did not alter the crystal structure of MCS but effectively broadened its light absorption range, leading to a red shift of the absorption edge and a narrowed band gap, as well as reduced charge transfer resistance and hydrogen evolution overpotential. The CQDs/MCS composite photocatalyst with the addition of 15 mL CQDs solution exhibited the optimal photocatalytic performance, with a hydrogen evolution rate of 13.11 mmol g −1 h −1 , which was 1.33 times higher than that of pure MCS. Moreover, the composite showed excellent recyclability. The enhanced hydrogen evolution performance of CQDs/MCS can be attributed to the fact that CQDs can capture photogenerated electrons and accelerate the separation of electron–hole pairs. In conjunction with the hole consumption by sacrificial agents, the CQDs/MCS composite achieved significantly enhanced photocatalytic hydrogen evolution performance.
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DOI
高影响因子
Journal of Biomaterials and Tissue Engineering
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2022
·Vol. 12
·期 9
·1683-1691
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IF 0.144
Li Hongxia,Gao Xiang,Niu Xiaohui,Zhang Deyi,Fan Haiyan,Wang Kunjie
The emergence of bacterial resistance to traditional antibiotics and its global spread has brought huge threats to human life and health, and the need for new alternative antibacterial agents has become increasingly urgent. The rapid development of nanoscience provides a potential alternative
to antibacterial therapy. In this study, g-C3N4 was synthesized using melamine as the raw material. It was then successfully combined with carbon quantum dots (CQDs) and silver sulfide to synthesize a g-C3N4/CQDs/Ag2S composite material.
Such combination narrows the band gap of g-C3N4 from 2.53 eV to 2.21 eV and enhances the photocatalytic efficiency. Consequently, it indicated photocatalytic antimicrobial effects against three strands of bacteria, Shylococcus aureus (Grampositive), Escherichia
coli (Gram-negative) and Methicillin-resistant Staphylococcus aureus under the irradiation of visible light. Other than the common pathogens, g-C3N4/CQDs/Ag2S exhibited an appreciable inhibition against the well-known drug-resistant bacteria. With
its antimicrobial features and excellent photoelectric properties, the as prepared nanocomposites show its potential in the development of new antimicrobial and photocatalytic materials.
研究领域:
材料科学
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微生物学
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纳米医学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Dengyang Wang,Qing Wang,Mingxiu Tan,Shasha Wang,Shaohua Luo,Pengqing Hou,Yahui Zhang,Shengxue Yan,Xin Liu
Carbon quantum dots (CQDs) as a multifunctional carbon nanomaterial have drawn great attention in the field of energy attribute to quantum size, various functional groups and unique physicochemical properties. In this work, the CQDs were prepared from soybean by a simple hydrothermal method , then further pyrolyzed into honeycomb carbon (HC), spherical pore carbon (SC) and bulk porous carbon (BC) with the assistance of templates, respectively. As the anode materials in potassium ion battery (PIBs), HC delivered a high specific capacity of 280.5 mAh g −1 at 0.1 A g −1 and a superior rate performance (136 mAh g −1 at 5 A g −1 ), ascribing to its abundant surface active sites of potassium ion storage and special structures conducive to potassium ion diffusion. This study provides an excellent anode for PIBs from a simple route to construct CQDs-derived carbon.
研究领域:
材料科学
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能源存储
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纳米技术
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2022
·
IF 3.428
Ying Wang,Changhai Liu,Park Yoon-Yul,Atarashi Hiroshi,Tomiyasu Hiroshi,Wenchang Wang,Zhidong Chen
By incorporating the advantages of different materials, the composite material can Preferably strengthen the electrochemical performance of the electrode material. In this paper, CQDs/P-Fe 2 O 3 on carbon cloth (CC) as flexible electrode material was synthesized with one-pot hydrothermal synthesis procedure. The one-dimentional (1D) structure was favorable due to the chemical stability, electrical conductivity, and fast electrochemical kinetics. While the current density is 0.5 A/g, the specific capacitance of the composite reaches 1786.5 F/g. The assembled supercapacitor remains at 91.31% of its initial specific capacitance after 1000 cycles. When the power density is 639.99 W/kg, the energy density is 103.11Wh/kg, and even when the power density is 12800 W/kg, the energy density can reach 44.8 Wh/kg.
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
危险品化学品经营许可证（带存储）