RSC Advances
·
2020
·Vol. 10
·期 2
·1181-1190
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IF 3.119
Weidong Peng,Chun Yang,Jiang Yu
A facile and feasible method was successfully utilized to incorporate Bi2O3 and g-C3N4 quantum dots on TiO2 surface to synthesize a novel composite g-C3N4/TiO2/Bi2O3. The photocatalytic activity of the composite g-C3N4/TiO2/Bi2O3 for degradation of dyes under sunlight and UV light irradiation was evaluated. It possessed the higher photocatalytic performance than that of pristine TiO2 or g-C3N4 under the same conditions. Under sunlight irradiation, the reaction rate constants of the g-C3N4/TiO2/Bi2O3 was about 4.2 times and 3.3 times higher than that of TiO2 and g-C3N4, respectively. The promising photocatalytic performance was attributed to the broader light absorption range and efficient separation of photoinduced carriers. Moreover, based on the TEM, XPS, XRD, UV-vis spectrum, radicals scavenging test and Mott–Schottky analysis systematic mechanism for photodegradation process was proposed. This work provides a promising strategy for the modification of TiO2-based semiconductors by incorporating different quantum dots and promoting the efficiency of the photocatalysts in practical application.
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
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Tao Wang,Xiqing Liu,Qiuyue Men,Wei Ma,Zhi Liu,Yang Liu,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, a simple method to load of g-C 3 N 4 quantum dots (CN QDs) onto Bi 2 Ti 2 O 7 (BTO) microsphere with the amount of CN QDs (3, 7, 10 and 15%). The photocatalyst was used for the treatment of water pollutants under visible-light illumination, which proved that CNBTO composites showed improved photocatalytic activity matched up to pure BTO. Reformation of BTO with CN QDs enhanced the light assimilation capacity, and promoted the isolation of photo-induced electron-hole pairs. The trapping experiments and ESR were announced the holes (h + ) and superoxide oxide (O 2 − ) played the key role, and the relative mechanism of the photocatalytic process was proposed. Meanwhile, the effects of CN QDs content, pH and initial pollutant concentration on the removal efficiency of ciprofloxacin (CIP) were studied. Results showed that the CN QDs loaded on BTO presented higher photocatalytic efficiency, and an optimum value for the dosage of photocatalytic in pH 8.0.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 11
·1826
·
IF 5.719
Jiahui Zhang,Yan Jing,Peng Zhang,Benhua Xu
Herein, oxygen-doped g-C3N4quantum dots (OCNQDs) were fabricated through sintering and ultrasonic-assisted liquid-phase exfoliation methods. The obtained OCNQDs with uniform size show high crystalline quality, and the average diameter is 6.7 ± 0.5 nm. Furthermore, the OCNQDs display excellent fluorescence properties, good water solubility, and excellent photo stability. The OCNQDs as fluorescence probe show high sensitivity and selectivity to Fe3+ions. Furthermore, the fluorescent OCNQDs are applied for live cell imaging and Fe3+ions detecting in living cells with low cytotoxicity, good biocompatibility, and high permeability. Overall, the fluorescent OCNQDs fabricated in this work can be promising candidates for a range of chemical sensors and bioimaging applications.Keywords:oxygen-doped g-C3N4quantum dots;fluorescence;metal ion detection;bioimaging
研究领域:
材料科学与工程
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生物医学工程
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化学
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DOI
PubMed
高影响因子
Nano Research
·
2021
·Vol. 14
·期 11
·4188-4196
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IF 8.897
Guo Sheng-Qi,Zhang Haijun,Hu Zhenzhong,Zhen Mengmeng,Yang Bo,Shen Boxiong,Dong Fan
Semiconductor combination is one of the most common strategies to obtain high-efficiency photocatalysts; however, the effect mechanism of composition ratio on micro-structure and photocatalytic activity is remaining unclear. In this study, a case of g-C 3 N 4 quantum dots@SnS 2 (CNQD n @SnS 2 ) heterojunction with different ratio of CNQD is used to uncover the origin of optimum and excess composition for photocatalysts. Research on the functional mechanism of the optimum composition shows that 0.8 wt.% CNQD are completely attached to the non-(001) facets of SnS 2 , which benefits the formation of type-II heterojunction, resulting in an optimal pollutant degradation and mineralization efficiency. For the excess composition, both experiments and theoretical calculations confirm that excess CNQD (the part exceeding of 0.8 wt.%) located on the (001) facet of SnS 2 , leading to the type-I band alignment of this heterojunction, which severely restricts the separation of photo-induced charge carriers, and thus reduces their lifetime. This work makes the functional mechanism of composition ratio on micro-structure and photocatalytic activity clearer. Related research results provide a new insight into semiconductor combination study and take an important step toward the rational design of highly active photocatalysts.
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
ACS Applied Energy Materials
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2021
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IF 6.024
Yiwen Hong,Jingxia Yang,WonMook Choi,Jinjie Wang,Jingli Xu
For increasing the specific capacitance of supercapacitors, boron-doped g-C3N4 quantum dots (B-CNQDs) were synthesized by KOH cutting and further adsorbed on the surface of Ni(OH)2 nanoflowers (B-CNQDx-Ni) by a mild impregnation method via electrostatic force. The B-CNQDx-Ni nanocomposites exhibit an increased surface area and reduced band gap energy compared with pure Ni(OH)2, which result in a larger contact area between the electrode and the electrolyte and enhanced charge-transfer kinetics. The best B-CNQDx-Ni sample has an excellent specific capacitance of 1700 F/g at 1.5 A/g, low impedance at the alkaline conduction of 7.421 Ω, and a high stability cycling performance of 82% capacity retention after 5000 cycles, suggesting that B-CNQDx-Ni is a type of suitable electrode material used in supercapacitors.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
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2021
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IF 8.001
Yanan Wei,Xin Li,Yunlei Zhang,Yongsheng Yan,Pengwei Huo,Huiqin Wang
Wide-light absorption performance and efficient carrier separation ability are the necessary conditions for excellent photocatalytic materials. In this research, g-C 3 N 4 QDs (CN QDs) and Au nano-particles (NPs) co-modified CeO 2 /Fe 3 O 4 micro-flowers (MFs) photocatalyst (CACeF) has been prepared. CO 2 photoreduction experiments showed that the composite had obviously enhanced photoreduction activity and photocatalytic stability. The yields of CO and CH 4 over it as catalyst in 4 h is about 5 and 8 times greater than that of pure CeO 2 . Photoelectrochemical tests showed that the heterojunction between CN QDs and Au NPs can greatly improve the carrier separation ability and the light-utilization efficiency of photocatalysts. Besides, the excellent electronic transmission performance of Au NPs provided a specific channel for the electron transmission, and the strong local surface plasmon resonance (LSPR) of Au NPs resulted in a lot of hot-electrons can directly take part in the CO 2 photoreduction. The synergistic effect between CN QDs and Au NPs can further enhance the photocatalytic activity of the photocatalyst. Fe 3 O 4 QDs can ensure the effective recovery and reuse of the composite without affecting the photocatalytic performance of composite. Finally, a potential photoreduction mechanism of CN QDs and Au NPs co-modified CeO 2 /Fe 3 O 4 MFs photocatalyst were discussed in total.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Jia-Rui Yang,Yu-Fei Lin,Zhen-Liang Xu,Rui Jia,Yin-Xin Fang
Pervaporation (PV) shows significant potential for the highly selective isopropanol (IPA). The pursuit of developing PV membranes with outstanding separation effect and enduring high purity permeation is an indispensable goal. Based on polyamide (PA) separation layers, a polydopamine (PDA) mixed g-C 3 N 4 quantum dots (gCNQDs) coating as the interlayer was deposited onto a porous ceramic hollow fiber substrate to fabricate thin-film nanocomposite membranes with an interlayer (TFNi). The nanocomposite interlayer enabled the formation of a smoother and highly separated selective polyamide layer. The separation factor exhibited a 31-fold enhancement with the augmentation of the blending fraction of gCNQDs during the PDA coating process. The resulting TFNi membrane attained an exceedingly high separation factor of 10270 ± 90 with a permeate water concentration of 99.9 % and demonstrated a satisfactory flux of 1.40 ± 0.08 kg m −2 h −1 during the PV process of 90 wt% IPA dehydration at 60 °C. This study presents a fresh perspective on the implementation of nanocomposite interlayers, which is expected to expand the application of high-performance TFNi membranes in PV dehydration processes.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 10
·7834-7849
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IF 3.442
Dong Xuejun,Wu Keliang,Zhu Weifang,Wu Pengcheng,Hou Juan,Wang Zhaoxiong,Li Ran,Wu Jianning,Liu Zhiyong,Guo Xuhong
As a strong oxidizing pollutant, NO 2 can cause fire or even explosion. People living in atmosphere containing NO 2 for a long time will significantly affects human health. In this work, we developed a Schottky heterojunction sensor modified by g-C 3 N 4 quantum dots (g-C 3 N 4 QDs) and rGO deposited on TiO 2 nanotubes (TNTs) arrays. This sensor showed high response and extremely fast response/recovery time as well as excellent detection of ppb level of NO 2 at room temperature. TNTs were obtained using a one-step anodic oxidation process. TNTs were modified with g-C 3 N 4 QDs and rGO using quasi -CVD method and cyclic voltammetry during in situ electrodeposition, respectively. TNTs/g-C 3 N 4 QDs/rGO Schottky heterojunction sensor exhibited high sensitivity to 10 ppm of NO 2 (response equal to 15982) at room temperature. Below 15 ppb, sensing response also can reach 127. Sensor response was very fast and increased to 15982 in just 2 s when exposed to 10 ppm of NO 2 after which it recovers 90% within 1.16 s. This work clarified the influence of abundant oxygen vacancies (VO · ) in TNTs and photogenerated electrons on TNTs/g-C 3 N 4 QDs/rGO nanostructures as well as their sensing performances. Our experimental details demonstrated that Schottky barrier was established between TNTs and rGO, which was very beneficial for ppb-level NO 2 detection at room temperature.
研究领域:
材料科学
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环境科学
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传感器技术
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产品关联
DOI
高影响因子
Nano Energy
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2015
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IF 10.325
Guisheng Li,Zichao Lian,Wenchao Wang,Dieqing Zhang,Hexing Li
Size-controllable g-C 3 N 4 quantum dots (QDs) were in-situ synthesized and grafted onto single-crystalline TiO 2 nanotube arrays (TiO 2 -NTAs) based on nanotube-confinement effect. This photoelectrocatalyst exhibited high activity in synergetic H 2 evolution and organic pollutant degradation. The g-C 3 N 4 QDs, together with TiO 2 -NTAs due to multiple light reflections, promoted light harvesting owing to the narrow energy band gap and upconversion from quantum size effect of g-C 3 N 4 QDs. Meanwhile, the single-crystal TiO 2 in-situ formed during the g-C 3 N 4 synthesis process favored the photoelectron transfer, and the g-C 3 N 4 /TiO 2 heterojunctions further promoted separation of photoelectrons from holes. Moreover, the strong g-C 3 N 4 –TiO 2 interaction and the confinement effect of TiO 2 nanotubes efficiently inhibited self-gathering and leaching of g-C 3 N 4 QDs, leading to excellent stability in photoelectrocatalysis .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Ding Jiang,Ming Qin,Linhua Zhang,Xueling Shan,Zhidong Chen
Quests for stable and highly efficient electrochemiluminescence (ECL) emitters and a full understanding of the relation between the ECL emitter structure and its properties are a continual and active theme in the fields of ECL. In this work, an intense and stable ECL platform was achieved by encapsulating 0D graphite carbon nitride quantum dots (g-C 3 N 4 QDs) into 3D graphene hydrogel via a facile hydrothermal approach. The architectures of the as-fabricated 0D g-C 3 N 4 QDs/3D graphene hydrogel nanocomposites showed 4.3-fold ECL intensity relative to that of pure g-C 3 N 4 . This phenomenon was caused by a pore confinement effect, which could increase the electrochemical reaction efficiency because the pore channels could promote electron transfer and mass transport. The confinement effect could also localise a very large luminophore near the electrode surface, resulting in enhanced ECL emission. Moreover, the as-fabricated architecture ensured the stability of the g-C 3 N 4 QDs in the ECL field due to the increased dispersibility. On the basis of the excellent ECL performances, a novel ECL biosensor was fabricated for highly selective and sensitive detection of kanamycin (KAN) with the assistance of an aptamer. The proposed ECL sensor can quantify KAN from 1 pM to 50 nM with a limit of detection of 0.33 pM. Such work offers an efficient design idea for achieving a high-performance ECL platform and provides new insight into developing and applying a g-C 3 N 4 -based ECL system.
研究领域:
分析化学
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生物传感
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2025
·
IF 3.1
Yao Jie,Chen Hongfang,Yang Xiaohua,Iqbal Muzaffar,Bian Wei
Mercury ions (Hg 2+ ) are categorized as environmental pollutants, which distributed in water, soil, and food systems due to environmental contamination. Hence, designing a sensitive assay for the convenient determination of Hg 2+ is of great importance. Herein, S and O-doped graphite phase nitrogenized carbon quantum dots (S, O-C 3 N 4 QDs) was encapsulated within a europium -based metal-organic framework (Eu-MOF) to construct a novel ratiometric fluorescent nanoprobe for the quantitative detection of Hg 2+ . The native emission of S, O-C 3 N 4 QDs at 445 nm is used as a response signal, while Eu-MOF with fluorescence offers a reference signal at 619 nm. Hg 2+ exhibits high affinity for the surface functional groups of S/O-C 3 N 4 QDs, forming non-fluorescent chelation complexes that induce static quenching. This results in significant attenuation of the fluorescence intensity at 445 nm, while the emission at 619 nm remains invariant. A ratiometric fluorescence sensing platform was established based on the intensity ratio (F 445 /F 619 ) for the selective detection of Hg 2+ . The linear range of S, O-C 3 N 4 QDs/Eu-MOF of Hg 2+ was 0.25–35 µM and with a detection limit of 4.3 nM. The satisfying results demonstrate the effectiveness of the developed S, O-C 3 N 4 QDs/Eu-MOF-based fluorescence probe for Hg 2+ detection, highlighting its promising potential for environmental monitoring applications.
研究领域:
环境科学
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分析化学
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材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Qian Wei,Yan Yan,Qingmei Ge,Mao Liu,Nan Jiang,Hang Cong,Jiang-Lin Zhao
A novel photoelectrochemical sensor was constructed by ternary layer-by-layer composites of reduced graphene oxide (rGO), graphitic carbon nitride quantum dots (g-C 3 N 4 QDs), and hemicucurbit[12]uril (HemiQ[12]), on the Indium-Tin Oxide (ITO) piece in sequence. Electrochemical Impedance Spectroscopy (EIS) was employed to confirm the successful assembly of the sandwich electrode, and the functionalization of each layer was explored by comparing of the currents with stepwise coating of the materials to achieve the synergistic enhancement of photoelectrochemical intensity. The application of proposed electrode was achieved by ultrasensitive sensing for chloramphenicol (CAP), which provided a limit of detection low to 0.089 nM, with high selectivity, good reproducibility and stability. The acceptable recoveries for the determination of CAP in real samples of honey and milk illustrated the feasibility of the established analytical method.
研究领域:
分析化学
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材料科学
·
环境科学
✓ 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）