BIOSENSORS & BIOELECTRONICS
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2021
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IF 10.618
Fubin Pei,Shasha Feng,Yi Wu,Xuchu Lv,Hualai Wang,Shen-Ming Chen,Qingli Hao,Yang Cao,Wu Lei,Zhaoyang Tong
Aflatoxin B1 (AFB1) is the most toxic mycotoxin , is widely found in foods and animal feeds, and can pose a serious threat to our lives. A label-free photoelectrochemical (PEC) immunosensor was fabricated for the sensitive detection of AFB1. A Z-scheme heterojunction of gold nanoparticles (Au NPs) loaded on graphitic carbon nitride sheet and tungsten trioxide sphere composite (g-C 3 N 4 /Au/WO 3 ) acted as the highly sensitive platform. The g-C 3 N 4 /Au/WO 3 is capable, not only of immobilizing antibodies via Au NPs, but also enhancing the separation of electron-hole pairs due to its good energy band matching efficiency. The mechanism of photo-generated electron/hole transfer on g-C 3 N 4 /Au/WO 3 was explored using scavengers to eliminate active components. On this basis, an electron transfer pathway for the immunosensor was deduced. The PEC immunosensor displayed a linear concentration range from 1.0 pg mL −1 to 100 ng mL −1 and a low detection limit of 0.33 pg mL −1 (S/N = 3) for AFB1. Good reproducibility, stability, and specificity provide a solid foundation for the practical application of this immunosensor.
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DIAMOND AND RELATED MATERIALS
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2021
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IF 3.315
Yan Hua Gao,Wen Li Zhao,Ying Chen
In this paper, g-C 3 N 4 was modified by the synergistic effect of double salt KCl-(NH 4 ) 2 CO 3 , and porous g-C 3 N 4 with hydroxylated surface was prepared. Combined with a series of characterization (XRD, SEM , BET, FTIR, UV–vis DRS and XPS) and density functional theory (DFT) analysis, it is confirmed that KCl can cooperate with ammonium salt (NH 4 ) 2 CO 3 to produce rich pore structure , and (NH 4 ) 2 CO 3 , as an alkaline slow-release agent, can assist KCl to further enhance hydroxylation . KCl-(NH 4 ) 2 CO 3 not only plays a synergistic role in pore formation, but also introduces hydroxyl and cyano groups, which improves the hydrophilicity of g-C 3 N 4 , promotes the separation efficiency of photo-generated carriers, and is beneficial to enhance the photocatalytic activity . Taking methyl orange (MO) as the model of pollutant degradation, and proposed the possible degradation mechanism . This study provides a simple, efficient and widely applicable method for modifying g-C 3 N 4 to improve its activity.
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Nanoscale
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2021
·Vol. 13
·期 16
·7774-7782
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IF 7.79
Gangyong Li,Guangming Ren,Wei (Alex) Wang,Zongqian Hu
Carbonaceous materials are promising electrode materials for enzymatic biofuel cells (EBFCs) due to their excellent electrical conductivity, chemical and physical stability and biocompatibility. Design and preparation of carbon materials with a hollow structure and a rough surface are of great significance for immobilization of enzymes both inside and outside the carbon materials for EBFC applications. We report herein the synthesis of novel carbonaceous materials consisting of bamboo-shaped hollow N-doped carbon nanotubes (N-CNTs) and C3N4 nanosheets (denoted as N-CNTs@C3N4) as electrode materials for dual-capture of enzymes in glucose/O2 EBFCs. The combination of one-dimensional N-CNTs with an open structure and two-dimensional C3N4 nanosheets forms a three-dimensional crosslinking network that significantly enhances the immobilization of enzymes, electrode stability, and mass transfer of substrates, thus boosting the EBFC performance. As a result, EBFCs equipped with N-CNTs@C3N4 can generate a high open circuit potential of 0.93 V and output a maximum power density of 0.57 mW cm−2 at 0.47 V. Additionally, the as-fabricated glucose/O2 EBFCs are capable of directly harvesting energy from various soft drinks, which indicates the promising applications of the N-CNTs@C3N4 nanocomposite as an electrode material for EBFCs.
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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.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Yao Chen,Yanyan Zhu,Yuhui Zhao,Jing Wang,Meng Li
The complexation of metals and metal compounds with organic skeletons into nanohybrid composites attracts attention in electrochemical applications due to the improved charge transfer pathways, which enhance the electrocatalytic activity. In this study, CuO, Cu 2 O, and CuS were anchored on g-C 3 N 4 sheets to construct electrochemical sensors for the detection of acetaminophen (AP). The CuX/g-C 3 N 4 nanohybrid composites were analyzed via transmission electron microscopy, infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Among the CuX/g-C 3 N 4 nanocomposites, CuS/g-C 3 N 4 displays a higher electrochemical activity. The electrochemical CuS/g-C 3 N 4 , CuO/g-C 3 N 4 , and Cu 2 O/g-C 3 N 4 sensors have wide linear ranges of 5 to 500 µM with a low detection limit (LOD) of 0.26 µM, 5 to 300 µM with a LOD of 0.32 µM, and 5 to 250 µM with a LOD of 0.47 µM, respectively. The better performance of the CuS/g-C 3 N 4 sensor is probably because of its significantly higher catalytic rate constant with respect to the oxidation of AP in electrochemical kinetics compared with those of the two other sensors, which leads to the enhanced electrocatalytic oxidation of AP. The CuX/g-C 3 N 4 -based electrochemical sensors display an excellent selectivity, repeatability, reproducibility, and stability. These features suggest that CuX/g-C 3 N 4 based electrochemical sensors can be sensitively detected of AP.
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JOURNAL OF INORGANIC BIOCHEMISTRY
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2020
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IF 3.212
Han-Long Cheng,Hai-Ling Guo,An-Jian Xie,Yu-Hua Shen,Man-Zhou Zhu
At present, cancer has become a major disease threatening human health worldwide. Therefore, developing targeting guided multimode synergetic therapy has become one of the hot spots in current antitumor research and is also a great challenge. Herein, a new Fe 3 O 4 /g-C 3 N 4 @PPy-DOX nanocomposite containing magnetic iron oxide (Fe 3 O 4 ) nanoparticles (NPs), lamellar structure of graphite-like carbon nitride (g-C 3 N 4 ) and polypyrrole (PPy) shell with the loaded anti-tumor drug doxorubicin hydrochloride (DOX) was designed and prepared. The monodisperse Fe 3 O 4 nanoparticles (NPs) with the diameter of 20 nm endowed the nanocomposite with the magnetic targeting ability, reducing damage to normal tissues. It is very interesting that the Fe 3 O 4 NPs also possessed photosensitizer function for photodynamic therapy (PDT). The g-C 3 N 4 sheets as the photocatalysis towards the degradation of water for generating O 2 could effectively improve the hypoxia of solid tumors and increase the efficiency of PDT. In addition, PPy has high light-to-heat conversion efficiency, so was chosen for the cancer photothermal therapy (PTT). Finally, an anticancer drug (DOX) was loaded on the nanocomposite because the presence of mesoporous structure. Thus, the prepared Fe 3 O 4 /g-C 3 N 4 @PPy-DOX nanocomposites exhibit synergetic chemotherapy/PTT/enhanced PDT antitumor effect. This study provides an inspiration for combining targeting and multimodality to improve the anticancer efficiency.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yutong Luo,Jiaheng Qin,Guangxue Yang,Sha Luo,Ziming Zhao,Ming Chen,Jiantai Ma
The rational design and fabrication of distinctive coordination sites is an attractive and challenging approach to develop electrocatalysts with superior activity toward oxygen evolution reaction (OER). Constructing N-doped carbon shells coordinated with transitional metal composites can greatly enhance the OER activity of electrocatalysts. Herein, a facile electrochemical-pyrolysis strategy is applied to synthesize NiS/C 3 N 4 composite with N-Ni-S coordination sites by in-situ crystallization on copper foam (CF). A detailed characterization, especially synchrotron-based X-ray absorption fine structure (XAFS) clearly unravels the N-Ni-S coordination mode is successfully formed. As a result, NiS/C 3 N 4 presents excellent OER performance with a low overpotential of 334 mV at a current density of 10 mA cm −2 , a Tafel slope of 45 mV dec −1 , and robust electrochemical stability for 50 h in basic media, outperforming some recently reported conventional transitional metal electrocatalysts. The outstanding electrocatalytic performance of NiS/C 3 N 4 mainly originates from the N-Ni-S coordination sites, which can provide abundant catalytic active sites, facilitate charge transfer, and enhance electronic conductivity. Furthermore, by tuning the two important experimental parameters of electrodeposition potential and electropolymerization time, the relationship between morphology and electrocatalytic performance of catalysts is deeply explored. This work demonstrates the validity of improving electrocatalytic performance by elaborately tailoring the coordination sites, thereby opening up an applicable and inspiring avenue forward in the design of advanced electrocatalysts for water splitting.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 2
·1630-1642
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IF 3.553
Zhou Ling,Sun Menglong,Kou Jiahui,Lu Chunhua,Li Ling,Zhang Fangshu,Xu Zhongzi
Graphitic carbon nitride (g-C 3 N 4 ), as an organic polymer semiconductor, has been the focus of photocatalysts due to its physical and chemical stability, low cost and non-toxicity. However, pristine g-C 3 N 4 also has many drawbacks, such as small specific surface area and easy recombination of photoexcited carriers, which hampered its practical application. In this work, we first propose a design idea of embedding stereo molecular scaffold into g-C 3 N 4 framework with a facile copolymerization method for better exfoliating g-C 3 N 4 to reach a better photocatalytic hydrogen evolution under ordinary pressure. The stereo molecular scaffold looses the interlayer stacking of bulk g-C 3 N 4 , benefitting the exfoliation of g-C 3 N 4 . The hydrogen evolution activity of stereo molecular scaffold doped g-C 3 N 4 (AMCN-3-E) is about 7.54 times higher than that of the pristine MCN, which may due to the activated π → π * and n → π * electron transitions, creating more electron transition paths and accelerating the separation of photoexcited electrons and holes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Lei Zhao,Dan Yang,Lili Ma,Xueting Feng,Hanming Ding
It is a long-term goal to develop catalysts with high activity and stability in practical applications. Spinel FeCo 2 O 4 has been widely researched in heterogeneous catalysis due to its characteristics of stable structure and environmental friendliness. In this work, the composites of graphitic carbon nitride ( g -C 3 N 4 ) and spinel iron cobaltate (FeCo 2 O 4 ) have been fabricated and used to degrade rhodamine B (RhB) by combining the photocatalytic and Fenton-like reactions. The composite with 3% FeCo 2 O 4 (3%FeCo 2 O 4 /CN) showed the best degradation efficiency, with which about 98% RhB was degraded in 45 min. The catalytic activity of 3%FeCo 2 O 4 /CN was larger than that of FeCo 2 O 4 , g -C 3 N 4 , and their mechanical mixture. The synergetic interaction between photocatalytic and Fenton-like reactions and the effective separation of the photogenerated charges are responsible for the enhanced catalytic activity. The quenching and EPR experiments exhibit that SO 4 − , O 2 − , h + , and ΟΗ, especially SO 4 − , are involved in the removal of RhB. The cycle experiments confirm that the used catalyst can restore its catalytic activity after calcination at 400 °C. The work suggests that the composites show a good ability to degrade organic pollutants in wastewater.
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Journal of Cleaner Production
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2020
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IF 7.246
Qin Huang,Chen Wang,Derek Hao,Wei Wei,Luochun Wang,Bing-Jie Ni
The development of highly efficient and separation-free, low-cost photocatalysts have crucial prospect for sustainable wastewater treatment , because it is able to eliminate the hazards of organic pollutant with facile operation. However, the relatively high cost of previous photocatalysts highly obstructs the application of these materials. Herein, we report a cost-effective and distinct konjac/graphitic carbon nitride (KCN) aerogel , which has superior performance for advanced oxidation water treatment . The abundant porous structure of the ultralight aerogel ensures the rapid adsorption of pollutants, which is much helpful for the further photodegradation process. During the working process, the aerogel is half submerged in pollutant solution and half exposed in air, forming a distinctive gas-solid-liquid triphase system, where oxygen can be rapidly delivered into the solution via the porous channels, boosting the generation of hydroxyl and superoxide radicals. Meanwhile, the aerogel structure can separate the g-C 3 N 4 , obstruct its stacking, as well as improve the light absorption rate. The synthesis, utilization and readily biodegradable treatment of the KCN aerogels are all green and eco-friendly, which is extremely constructive for strategies to develop novel highly efficient photocatalytic materials.
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Jinge Du,Zhe Xu,Hui Li,Haijun Yang,Shengjun Xu,Jun Wang,Yanan Jia,Shuanglong Ma,Sihui Zhan
A novel Z-scheme Ag 3 PO 4 /g-C 3 N 4 heterostructures was constructed successfully for Escherichia coli inactivation and organic pollutants degradation under visible light irradiation. The Ag 3 PO 4 (8)/g-C 3 N 4 possessed the highest photocatalytic effect with more than 7 log of live Escherichia coli ( E. coli ) totally inactivated within 75 min and complete BPA degradation within 180 min. By mimicking the components of natural water individually, humic acid (HA) and inorganic anion were found to deeply affected the photocatalytic disinfection activity. Moreover, the Ag 3 PO 4 (8)/g-C 3 N 4 revealed significantly boosted visible-light-driven photocatalytic performance for ciprofloxacin and sulfadiazine degradation. The satisfying degradation effects of bisphenol A in nature waters were also obtained. The improved photocatalytic efficiency of Ag 3 PO 4 /g-C 3 N 4 may be attributed to the formation of Z-scheme heterostructure structure and matching valence band and conduction band, resulting in rapid separation of photo-induced carrier, enhanced electronic transport capacity and prolonged carrier lifetime. The possible mechanism was studied using radical quenching tests and electron spin resonance, suggesting that the hole, electron and hydroxyl radical were the paramount active species during Escherichia coli disinfection. This work pioneers a novel strategy for upgrading the photocatalytic disinfection and degradation capacities of g-C 3 N 4 based catalysts.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
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IF 4.872
Xiarong Zheng,Yuanqiong Liu,Xiaobin Liu,Qingbiao Li,Yanmei Zheng
A novel composite electrospun fiber with high photocatalytic efficiency, good stability, strong hydrophobicity, good pollution resistance, and easy separation and recovery was synthesized. The TiO 2 @g-C 3 N 4 (TCN) with special core-shell structure (5–10 nm shell) facilitated the separation of photogenerated electron-holes and had high photocatalytic performance. The poly (vinylidene fluoride) (PVDF) electrospun fiber immobilized with TCN was successfully fabricated (PVDF-TCN) with uniform distribution and size of nanofibers by using electrospinning, which was used for degrading tetracycline under visible-light irradiation (> 400 nm). A special rougher surface of electrospun fiber obtained by washing of sacrificial PVP increased the specific surface area, which became more conducive to the adhesion of the catalyst. The water contact angle and FTIR results demonstrated that the electrospun fiber became extremely hydrophilic after adding TCN catalyst, which could effectively mitigate the fiber pollution. The PVDF-TCN-0.2g electrospun fiber exhibited excellent photocatalytic performance and the degradation efficiency of tetracycline was up to 97% in 300 min under visible-light irradiation. The mechanism of PVDF-TCN electrospun fiber degradation of tetracycline in the photocatalytic process was also proposed. In addition, the PVDF-TCN-0.2g exhibited a stable activity after 4 cycles experiments since the degradation efficiency remained about 90%. Therefore, we believed this study provided a new strategy in catalyst immobilization and wastewater treatment.
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