Journal of the Taiwan Institute of Chemical Engineers
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2023
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IF 5.7
Yanxi Zhao,Shiyan Huang,Chengchao Liu,Yuhua Zhang,Longsheng Wang,Aihua lin,Jinlin Li
Background The design and synthesis of catalysts with high stability, activity and selectivity in Fischer–Tropsch synthesis (FTS) have been attracting extensive research attention. Maintaining high catalytic stability and activity is the best strategy for improving the catalyst efficiency and economic benefits. Methods In this study, graphitic carbon nitride (g-C 3 N 4 )-coated SBA-15 was utilised as a support material to prepare cobalt-based FTS catalysts. The catalysts coated with g-C 3 N 4 were studied via TEM, XPS, XRD, H 2 -TPR, TG, N 2 adsorption–desorption, and tested in a fixed-bed reactor. Significant findings The catalysts coated with g-C 3 N 4 were considerably more stable than the Co/SBA-15 catalyst without g-C 3 N 4 coating during a 100 h test period. Furthermore, the CO-conversion performance of the Co/SBA-15 catalyst decreased continuously. Notably, the activity of the Co/ [email protected] 3 N 4 catalyst with a low g-C 3 N 4 loading was higher than that of the Co/SBA-15@1C 3 N 4 catalyst with a relatively high g-C 3 N 4 loading. g-C 3 N 4 can significantly strengthen the interaction between the cobalt species and the support, thereby increasing the catalyst stability. Therefore, a highly stable catalyst with good activity can be achieved by employing a small amount of g-C 3 N 4 for surface modification. The results highlight the effectiveness of the proposed strategy for preparing highly stable, cobalt-based catalysts with good activity.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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IF 3.927
Hongbing Song,Lei Liu,Haozhong Wang,Bingxiao Feng,Meng Xiao,Yubao Tang,Xiaofei Qu,Hengjun Gai,Tingting Huang
The development of a photocatalyst with high activity, large specific surface area and precise band gap adjustment is the focus of the field of photocatalysis in realizing energy conversion and improving environmental issues. In this paper, a simple synthesis process for co-doping of KCl and NH 4 Cl to precisely adjust the band gap of g-C 3 N 4 was developed. Various characterization results show that doping with KCl and NH 4 Cl can reduce the band gap of the carbon nitride , increase its visible light absorption, improve its carrier separation efficiency, thus showing good photocatalytic activity . Cl and K enter the g-C 3 N 4 layers via intercalation and form a dual-element charge transport channel between these layers, thereby facilitating the transport of electrons. The introduction of NH 4 Cl increases the specific surface area of the composite, thus providing abundant adsorption and reaction sites. The co-loaded photocatalyst CN-NH 4 Cl-0.05KCl was used to degrade rhodamine B (RhB) and tetracycline (TC) and showed excellent photocatalytic activity. A possible mechanism of photocatalytic degradation is proposed based on the analytic results.
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APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Linsen Huang,Deyu Bao,Junhua Li,Xiaoqing Jiang,Xiaosong Sun
The residual antibiotics in water has become an environmental problem and is now deeply concerned. Z-scheme g-C 3 N 4 /defective ZnO heterojunction embellished with Au nanoparticles (Au-g-C 3 N 4 -ZnO) was synthesized by three sequential procedures, in-situ the preparation of g-C 3 N 4 , the guided cultivation of ZnO nanorods on g-C 3 N 4 nanosheets and the deposition of Au nanoparticles. The tailored photocatalysts, imbuing with inherent oxygen vacancies and outstanding light absorption capacity, exhibits unprecedented photocatalysis efficiency for tetracycline (TC) degradation. The formed Au-g-C 3 N 4 -ZnO implements broad-spectrum response, intensifying capacity of light harvest and utilization and promoting the separation and transmission efficiency of carriers. Remarkably, the photocatalytic degradation for TC by 2%Au-g-C 3 N 4 -ZnO achieves the best degradation efficiency of 74.7% within 30 min under Xe lamp irradiation. It displays excellent stability and acid or alkaline resistance. Besides, the TC degradation pathways are elucidated in line with intermediate degradation products. Finally, a novel Z-scheme heterojunction photocatalytic mechanism is rationally proposed based on the band structure, surface plasmon resonance effect, oxygen vacancies, charge transfer behaviors and active species generation.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Xiao Zhang,Bin Ren,Xi Li,Biming Liu,Shiwen Wang,Peng Yu,Yanhua Xu,Guoqiang Jiang
Carbon-bridge-modified malonamide (MLD)/g-C 3 N 4 (CN) was prepared by copolymerization of MLD with urea and melamine and loaded with Fe 3 O 4 for the high-efficiency removal of tetracycline (TC) in water under photo-Fenton. The prepared catalysts were characterized by SEM, TEM , N 2 adsorption–desorption analysis, XPS, XRD, and FTIR, which proved that the modification method successfully introduced the C bridge into the carbon nitride molecular system and increased the structural defects of the catalyst. The Carbon-bridge-modified MLD/CN/Fe 3 O 4 also had good visible-light response and charge-separation and transport abilities in the photoelectrochemical test. Degradation results showed that the photo-Fenton degradation of TC reached 95.8%, and the mineralization rate was 55.7% within 80 min at 80 mM H 2 O 2 dosage, 0.5 g/L catalyst dosage, and near-neutral pH by 0.8MLD/CN/Fe 3 O 4 . Moreover, the oxidation products and mineralization pathways of TC were explored by LC-MS. Toxicity analysis indicated low environmental threat of the intermediates in TC mineralization. EPR analysis and H 2 O 2 decomposition efficiency analyses showed an improvement in the H 2 O 2 decomposition performance of 0.8MLD/CN/Fe 3 O 4 . This work could provide a valuable insight for the application of heterogeneous photo-Fenton technology in wastewater treatment .
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2021
·Vol. 104
·期 12
·6319-6334
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IF 3.784
Limin Zhao,Ruifa Jin,Baofeng Zhang
In this paper, a novel Z-scheme photocatalyst Er 3+ :Yb 0.5 Y 2.5 Al 5 N 0.01 F 0.01 O 11.98 /g-C 3 N 4 –Pt–BiPO 4 was synthesized by sol-hydrothermal and calcination methods. The prepared samples were characterized by XRD, SEM, TEM, EDS mappings, XPS, PL, and DRS. In addition, the optimal hydrothermal conditions for the preparation of BiPO 4 were explored with the azofuchsin solution and ciprofloxacin(CIP) solutions as the target pollutants. At the same time, the best calcination temperature and the best calcination time of the Er 3+ :Yb n Y 3−n Al 5 N x F y O 12−x−y and BiPO 4 were investigated. The results showed that the Z-scheme Er 3+ :Yb 0.5 Y 2.5 Al 5 N 0.01 F 0.01 O 11.98 /g-C 3 N 4 –Pt–BiPO 4 photocatalyst has strong redox ability, wide absorption range of visible light, and excellent separation effect of electron–hole pairs, which can efficiently degrade organic pollutants and antibiotic.
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NANO
·
2021
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IF 1.556
Jungang Yi,Kun Wu,Huadong Wu,Jia Guo,Linfeng Zhang,Hao Li,Jianding Li
The presence of the antibiotics in the wastewater has posed a huge risk to aquatic life and human health. It is a great significance to develop an effective technology to treat the antibiotics-containing wastewater. In this study, a series of g-C 3 N 4 /NH 2 -MIL-88B(Fe) composite photocatalysts are synthesized through a simple one-step method. The structure and optical properties of prepared photocatalysts are detected by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–Vis absorption spectra (UV–Vis DRS), photoluminescence (PL) spectroscopy and transient photocurrent techniques, respectively. FESEM and TEM show that MOF is uniformly dispersed in petaloid g-C 3 N 4 . The uniform dispersion of Fe-MOFs in the heterojunction composites increases the specific surface area ( S BET ) of g-C 3 N 4 , which results in a great adsorption property for the nanocomposite. The capture experiment shows that • O 2 − and h + are the main active substances in ciprofloxacin (CIP) degradation. These prepared composite photocatalysts exhibit excellent CIP photodegradation activity under visibly light irradiation with an apparent rate constant of 0.0127 min − 1 (3.74 times as the rate of single component). The remarkable catalytic performance can be ascribed to the fact that the g-C 3 N 4 /NH 2 -MIL-88B(Fe) heterojunction inhibits the recombination of photoinduced electron–hole pairs and improved the visible light absorption.
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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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ACS Applied Energy Materials
·
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 HAZARDOUS MATERIALS
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2020
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IF 9.038
Hao Wu,Jun Wu,Hongyong Wang,Yaling Liu,Guoqing Han,Pei Zou
Malathion is one of the most commonly used organophosphorus pesticides that can cause serious harm to the ecological environment and human health. Herein, we demonstrated a label-free chemiluminescent aptasensor for the sensitive detection of malathion based on exonuclease-assisted dual signal amplification and G-quadruplex/hemin DNAzyme. Upon the addition of malathion, the aptamer probe specifically bound to the target to form a complex malathion-S3, leaving a duplex S1-S2. The complex malathion-S3 was digested by exonuclease I and the target was released. The released target was recycled to perform exonuclease I-assisted signal amplification. Furthermore, after treatment with exonuclease III, the duplex S1-S2 was converted into the secondary target ST. The secondary target ST interacted with the hairpin H1 to form a complex H1-ST, which was further digested by exonuclease III and released the secondary target. The released secondary target was recycled to perform exonuclease III-assisted signal amplification. After complete amplification, large numbers of G-quadruplex/hemin DNAzymes were generated. Under the optimal experimental conditions, the prepared aptasensor showed an excellent linear response to malathion with a detection limit of 0.47 pM. The relative standard deviations were in the range of 4.2–6.9%. Moreover, the aptasensor was successfully applied to detect malathion in spiked food and traditional Chinese medicine samples.
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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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