Catalysis Science & Technology
·
2018
·Vol. 8
·期 23
·6241-6251
·
IF 5.365
Zhuang Guo,Linbi Zhou,Hongbin Cao,Yongbing Xie,Jiadong Xiao,Jin Yang,Yi Zhang
The electro-peroxone (E-P) process normally exhibits low efficiency in organic degradation in acid solution due to the limited rate constant of the reaction between O3 and H2O2 (peroxone reaction). In this paper, a C3N4–Mn/CNT composite material was synthetized and characterized with XRD, FTIR, SEM and XPS. With the function of the C3N4–Mn/CNT catalyst, the substrate oxalic acid (OA) was completely degraded in the E-P process within 30 min at pH 3, while only 15% degradation could be achieved after 60 min without the catalyst. The comparison of different reaction systems using the C3N4–Mn/CNT catalyst confirmed that the catalyst promoted the peroxone reaction, rather than the catalytic ozonation or electro-Fenton like reaction. Correlating the XRD and XPS analysis with the degradation data using the C3N4–Mn/CNT catalyst, we deduced that Mn coordinated with nitrogen was the active site for the peroxone reaction. Furthermore, the catalyst showed good chemical and catalytic stability in five cycles of the E-P process for OA degradation.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-7
·
IF 5.479
Zhang Bing,Jia Yejing,Wang Jing,Hu Xing,Zhao Zhihuan,Cheng Yan
A sensitive photoelectrochemical (PEC) immunoassay for the carcinoembryonic antigen (CEA) is described that is based on the use of C 3 N 4 -BiOCl semiconductor on an ITO electrode. The photocurrent of the modified electrode was measured under visible light illumination. It increased in presence of L-cysteine due to rapid separation of the photoexcited electrons and holes. A sandwich-type immunoassay in a 96-well microtiter plate format used CuO nanoparticles as label for the secondary antibody. The Cu 2+ is released from the CuO in the sandwich complex by treatment with acid. The free Cu 2+ combined with both the cysteine and the electron receptors of C 3 N 4 and BiOCl. Under optimal conditions, this dual action immensely decreases the photocurrent of the PEC system, and the response is inversely proportional to the CEA concentrations from 0.1 pg mL −1 to 10 ng mL −1 at the working voltage of 0 V (vs. SCE). The detection limit is 0.1 pg mL −1 , and the method is exhibited satisfactory selective, repeatable and stable.
Schematic representation of an immunoassay based on cysteine-assisted C 3 N 4 -BiOCl photoelectrochemical platform. CuO nanoparticles were utilized as labels in immunocomplex to release Cu 2+ in acidic condition. Carcinoembryonic antigen in sample was detected sensitively by dual function of Cu 2+ with cysteine and C 3 N 4 -BiOCl semiconductor.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 19
·19122-19133
·
IF 2.8
Ren Bin,Wang Tiecheng,Qu Guangzhou,Deng Fang,Liang Dongli,Yang Wenli,Liu Meishan
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by simple ultrasonic mixing and calcination by using TiO 2 and melamine as precursors. The morphology and structure of the prepared photocatalysts were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to degrade Orange II (AO7) under visible light irradiation were evaluated. Results showed that the photocatalytic rate of the prepared g-C 3 N 4 /TiO 2 photocatalyst to degrade AO7 was about three times than that of pristine TiO 2 and g-C 3 N 4 . The g-C 3 N 4 /TiO 2 composite with a ratio of 1:4 had the highest degradation efficiency for AO7 solution. Its degradation efficiency under acidic conditions was significantly higher than that under alkaline conditions. The enhancement of photocatalytic activity can be attributed to the formation of heterojunctions between g-C 3 N 4 and TiO 2 , which leads to rapid charge transfer and the efficient separation of photogenerated electron-hole pairs. The recycling experiment indicated that the photocatalyst of g-C 3 N 4 /TiO 2 nanocomposites still maintained good photochemical stability and recyclability after five cycles; this finding was important for its practical applications. A series of free radical trapping experiments showed that •O 2 − played a crucial role in the degradation of AO7.
ᅟ
✓ 已验证
DOI
PubMed
高影响因子
ACS Nano
·
2018
·
IF 13.709
Sufeng An,Guanghui Zhang,Tingwen Wang,Wenna Zhang,Keyan Li,Chunshan Song,Jeffrey T. Miller,Shu Miao,Junhu Wang,Xinwen Guo
Ultra-small metal clusters have attracted great attention owing to their superior catalytic performance and extensive application in heterogeneous catalysis. However, the synthesis of high-density metal clusters is very challenging due to their facile aggregation. Herein, one-step pyrolysis was used to synthesize ultra-small clusters and single-atom Fe sites embedded in graphitic carbon nitride with high density (iron loading up to 18.2 wt %), evidenced by high-angle annular dark field-scanning transmission electron microscopy, X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and 57Fe Mössbauer spectroscopy. The catalysts exhibit enhanced activity and stability in degrading various organic samples in advanced oxidation processes. The drastically increased metal site density and stability provide useful insights into the design and synthesis of cluster catalysts for practical application in catalytic oxidation reactions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jiaxing Huang,Daguang Li,Ruobai Li,Qianxin Zhang,Tiansheng Chen,Haijin Liu,Yang Liu,Wenying Lv,Guoguang Liu
Non-metal doping has been frequently used in g-C 3 N 4 (CN) as a feasible and economical technique for maintaining its metal-free properties, while improving its photocatalytic performance. In this study, a novel phosphorus and oxygen co-doped graphitic carbon nitride (POCN) was successfully synthesized through a one-step thermal polymerization method and exhibited remarkable photocatalytic activity for the photocatalytic degradation of fluoroquinolones (FQs). The degradation rate of enrofloxacin (ENFX) was 6.2 times higher than that of CN. Based on the results of X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance spectroscopy (NMR), P atoms replaced the corner and bay carbon sites, whereas O atoms replaced the nitrogen sites in the g-C 3 N 4 framework. The improvement of the photocatalytic effect of POCN0.01 was attributed to its narrow bandgap, effective charge separation and enhanced specific surface area. This is the first report to describe the use of phosphorus doping to promote the generation of reactive oxygen species (ROS). ROS scavenging tests revealed that O 2 − was the primary active species during the degradation of ENFX. Furthermore, pathways for the degradation of ENFX were proposed via the detection of intermediate products via HRAM LC–MS/MS and the prediction of active sites using the Fukui function.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Yongning Ma,Panpan Li,Peihan Wu,Mingyuan Guo,Yuhao Yang,Xiaolong Li
In photocatalytic anticorrosion perspective, the migration rate of excited electrons from surface layers to substrate steels restricted the performance of g-C 3 N 4 due to the high resistance between interface of g-C 3 N 4 layers and adhesive layers. Herein, an S-scheme g-C 3 N 4 /polyaniline (PANI) heterojunction with face-to-face structure was established by a secondary calcining method. The as-prepared heterojunctions were applied to protect Q235 carbon steel, and the results showed that the anticorrosion performance of S-scheme g-C 3 N 4 /PANI heterojunction is much higher than that of g-C 3 N 4 and PANI coating layers according to salt spray test. Photocurrent intensity indicated that the optimum amounts of g-C 3 N 4 and PANI were 0.06 and 0.09 mL/cm 2 , which are benefit for the transport of excited electrons due to the optimum thickness of coating layers. Furthermore, the S-scheme g-C 3 N 4 /PANI heterojunction can promote the separation rate of charge carriers and suppress the recombination rate at the same time, which are inferred from photocurrent intensity, electrochemical impedance spectra, super-depth-of-field microscope, and photoluminescence investigation. In the last, the enhanced anticorrosion performance of S-scheme g-C 3 N 4 /PANI heterojunction with face-to-face structure was deduced according to mentioned characterization.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 15
·7171-7176
·
IF 3.269
Jing Chen,Qin Ma,Caihe Wang,Xiaoyan Hu,Yunjing Gao,Huan Wang,Dongdong Qin,Xiaoquan Lu
A novel strategy was developed for the fluorescence detection of nitrite (NO2−) in real samples. The method is based on the reaction of water-dispersible graphite-like carbon nitride (w-g-C3N4) with nitrite (NO2−) in an acidic medium to form a new kind of weak fluorescence species. Under optimal conditions, the limit of detection (LOD) for nitrite (NO2−) detection was determined to be 0.16 nM (S/N = 3), and the relative fluorescence intensity versus logarithm concentration of nitrite (NO2−) showed good linearity in the range from 0 to 58.5 μM with R2 = 0.997. This probe displayed several appealing properties including low-cost, simplicity and convenience, high sensitivity, and excellent selectivity.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2016
·
IF 0
Fang Wang,Yong Tao Zhang,Yanli Xu,Xing Wang,Sunfeng Li,Hanbiao Yang,Xueting Liu,Fengyu Wei
N-K 2 Ti 4 O 9 /g-C 3 N 4 /UiO-66 ternary composites were successfully synthesized by a solvothermal method, and were characterized by powder X-ray diffraction, UV–vis diffuse reflectance spectroscopy, the valence band X-ray photoelectron spectroscopy, field emission transmission electron microscopy , photoluminescence emission spectra and N 2 adsorption-desorption. Photocatalytic activities of N-K 2 Ti 4 O 9 , g-C 3 N 4 , UiO-66, N-K 2 Ti 4 O 9 /g-C 3 N 4 binary composites and the ternary composites were investigated by the degradation of Rhodamine B (RhB) under visible light irradiation. The results show that the ternary composites exhibit higher photocatalytic activity as compared with the binary composites and the pure materials. The synergistically enhanced photocatalytic activity of the ternary composites is due to coupling direct solid-state Z-scheme N-K 2 Ti 4 O 9 /g-C 3 N 4 heterojunction with high adsorption capacity of UiO-66 for RhB.
✓ 已验证
产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Jingqi Tian,Qian Liu,Abdullah M. Asiri,Xuping Sun,Yuquan He
Ultrathin graphitic C 3 N 4 (g-C 3 N 4 ) nanofibers about 5–10 nm in diameters have been rapidly prepared via alkali-catalyzed hydrolysis of bulk g-C 3 N 4 in concentrated alkaline aqueous solution. The morphologies of the g-C 3 N 4 nanostructures can be facilely controlled by varying reaction time, and a scissoring mechanism is proposed to explain the formation process involved. The g-C 3 N 4 nanofibers can serve as a novel fluorosensor for rapid Fe 3+ detection with high sensitivity and selectivity.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·
IF 2.6
Ravichandran Balamurali,Narayanan Naresh,Ravichandran Sabarinathan,Liu Huiyuan,Zhang Weiqi,Bhuvanendran Narayanamoorthy,Su Huaneng
In this study, PtCo alloy nanoparticles (NPs) were successfully synthesized and deposited on nitrogen-rich carbon nanosheets derived from Polypyrrole-g-C 3 N 4 using a chemical reduction method. This electrocatalyst not only offers enhanced catalytic efficiency but also significantly improves the stability for the oxygen reduction reaction (ORR) in in acidic medium. In terms of electrocatalytic performance, the PtCo/CN@PPY-g-C 3 N 4 catalyst demonstrated a mass activity of 0.378 mA µg Pt −1 at 0.85 V, 0.131 mA µg Pt −1 at 0.9 V and a specific activity of 2.900 mA cm Pt −2 at 0.85 V, 1.004 mA cm Pt −2 at 0.9 V which are respectively 2.3, 2.8 and 10, 12 times higher than those of a commercial 20% Pt/C catalyst (0.166 mA µg Pt −1 at 0.85 V, 0.046 mA µg Pt −1 at 0.9 V and 0.285 mA cm Pt −2 at 0.85 V, 0.079 mA cm Pt −2 at 0.9 V). This indicates superior catalytic activity. Furthermore, after 5000 cycles, the PtCo/CN@PPY-g-C 3 N 4 retained approximately 77% at 0.85 V and 83% at 0.9 V of its initial mass activity, with only a 14 mV decrease in the half-wave potential, whereas commercial 20% Pt/C catalyst retained only 40% at0.85 V and 30% at 0.9 V of its initial mass activity. These enhancements can be attributed to the synergistic effects and strong interactions between the Pt–Co alloy nanoparticles and the carbon nitride support. The findings of this study underscore the potential of PtCo/CN@PPY-g-C 3 N 4 as a viable and efficient alternative to traditional catalysts in electrochemical applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qingling Liu,Zi Yu,Dongmei Liang,Jie Xiong,Tao Gan,Huayu Hu,Zuqiang Huang,Yanjuan Zhang
Internal electric field (IEF) of heterojunction photocatalysts is considered as the potent driving force for efficient charge separation, however, the presence of high energy barrier and poor interfacial stability in nascent heterojunctions hinder interfacial charge separation and migration. In this study, an elemental imprinting-induced interfacial growth strategy was proposed to bridge g-C 3 N 4 (CN) and Bi 2 MoO 6 (BMO) for synthesizing BMO/Bi-CN Z-scheme heterojunction photocatalyst by creating an essentially connected porous network to enable easy transfer of the guest material to the binding sites. The established interfacial N–Bi–O bonds enhanced the stability of heterojunction and served as rapid channels for charge transfer, effectively promoting the migration rate and separation efficiency of photogenerated carriers. Particularly, the Ohmic contact between the interface significantly reduced the interfacial energy barrier. Experimental and theoretical analyses demonstrate that the interfacial chemical bonds and Ohmic contact reinforced the IEF and significantly enhanced the photocatalytic performance of BMO/Bi-CN, achieving complete degradation of ciprofloxacin with a kinetic rate constant of 0.0481 min −1 . This strategy plays a crucial role in establishing interfacial chemical bonds and optimizing heterogeneous structure of composite photocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yanan Wang,Jiayu Ding,Qi Yin,Cheng Zhang,Yiqing Zeng,Song Xu,Qian Liang,Man Zhou,Zhongyu Li
This study developed a novel Cu@C/NCN-T composite for efficient photothermal catalytic CO 2 reduction. The composite, consisting of carbon-coated Cu (Cu@C) derived from Cu-BTC embedded in three-dimensional graphitic carbon nitride (NCN-T), was immobilized on the surface of carbonized wood (C-wood) floating on water, creating a triphase system (CO 2 , H 2 O, and catalyst). The optimized composite demonstrated remarkable CO 2 photothermal reduction performance, achieving a rate of 31.3 μmol·g −1 ·h −1 . This performance surpassed that of pure NCN-T and Cu@C by 1.6 and 3.8 times, respectively. The combination of Cu and carbon materials endowed Cu@C/NCN-T with excellent light-absorption properties, resulting in a photothermal effect that elevated the surface temperature and facilitated the catalytic reaction . Furthermore, the Schottky junction formed between Cu@C and NCN-T promoted the separation of electron-hole pairs, with Cu@C acting as charge channels. A charge transfer mechanism was proposed to explain these findings. This catalyst engineering approach holds promise for the development of efficient non-noble metal catalysts for rapid CO 2 photothermal reduction.
✓ 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）