APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
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IF 6.007
Ze’ai Huang,Qiong Sun,Kangle Lv,Zehui Zhang,Mei Li,Bing Li
In this paper, effect of contact interfaces of high-energy TiO 2 , (1 0 1) and (0 0 1) facets, with g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /TiO 2 hybrid was studied using TiO 2 hollow nanobox (TiO 2 -HNB) assembly from high-energy TiO 2 nanosheets (TiO 2 -NS) as model. The prepared photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), nitrogen sorption , Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectrometer (XPS). The photoreactivity of the photocatalyst was evaluated by measure the formation rate of photo-induced hydroxyl radicals ( OH) using coumarin as a probe molecule and photocatalytic degradation of Brilliant Red X3B (an anionic dye) under UV irradiation ( λ = 365 ± 10 nm). It was found that g-C 3 N 4 /TiO 2 -HNB forms direct Z-scheme photocatalytic system, which shows superior enhancement on the photocatalytic activity of TiO 2 than g-C 3 N 4 /TiO 2 -NS. It is by contacting g-C 3 N 4 with (1 0 1) facets, g-C 3 N 4 can efficient remove the photo-generated electrons accumulated on (1 0 1) facets of high-energy TiO 2 , which results in spatially isolated photo-generated electrons and holes, enhancing the photocatalytic activity.
研究领域:
材料科学
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环境科学
·
光化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yuangang Li,Rongrong Wang,Huajing Li,Xiaoliang Wei,Juan Feng,Kaiqiang Liu,Yongqiang Dang,Anning Zhou
Co-Pi decorated TiO2@graphitic carbon nitrides (g-C3N4) nanorod arrays (denoted as CCNRs) with different mass ratios of g-C3N4 have been constructed on the FTO substrate through three processes, hydrothermal growth, chemical bath deposition and electrodeposition. First, TiO2 nanorod arrays were grown onto a FTO substrate by a hydrothermal method. Second, g-C3N4 was coated onto the TiO2 nanorod arrays by immersing the above substrate with TiO2 nanorod arrays into a solution of urea and then heated at higher temperature. In this procedure, the amount of the g-C3N4 on the TiO2 nanorod arrays can be controlled by tuning the concentration of the urea solution. At last, Co-Pi were decorated on the surface of the TiO2@g-C3N4 by electrodeposition. The as-prepared CCNRs were characterized by XRD, FESEM, TEM, XPS, UV–vis, and FTIR, respectively, which illustrated that Co-Pi moieties were successfully decorated on the hybrid TiO2@g-C3N4 nanorod arrays. Photoelectrochemical (PEC) measurements have demonstrated that the prepared CCNRs serve as an efficient and stable photoanode for PEC seawater splitting. The photocurrent density reaches 1.6 mA/cm2 under 100 mW/cm2 (AM1.5G) light illumination at 1.23 V (RHE). More significantly, the CCNRs photoanode is quite stable during seawater splitting and the performance remain undiminished even after 10 h continuous illumination. Finally, a systematical photocatalytic mechanism of the Co-Pi decorated TiO2@g-C3N4 was proposed, and it can be considered as potential explanation of enhanced PEC performance.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Luolu Zhou,Meng Chen,Hu Yang,Zhen-liang Xu
This study introduces a novel ultrafiltration (UF) membrane, called NFFM, which utilizes a nanofiber (NF) layer as an integral filler during the phase inversion process. The photoactive NFFM was prepared using photoactive PAN-C 3 N 4 (PCN) NF, which is made using C 3 N 4 nanosheets as a visible light responsive photocatalyst with a loading ratio of up to 20%. NFFM membranes made using PAN NF, hydrophilic modified PAN-C 3 N 4 (HPC) NF as filler, and PAN-C 3 N 4 blend membrane were also prepared for comparison. NFFMs showed special morphologies, such as porous surfaces, selective layer located at the internal interface in cross-section, diverse pore sizes and pore size distribution , which are different from that of the traditional blend membrane made with the same ratio of components. Because the dissolving of NF layer into the casting solution changes the composition, polymer distribution, and property of the casting solution, thus change the membrane property. Thickness, composition and surface states of NF Layer can influence its dissolution process. Membrane filled with PCN NF (NFFM-PCN) showed a smaller pore size than membrane filled with HPC (NFFM-HPC), due to the low solubility of HPC. Moreover, a longer contacting time can cause the casting solution penetrate into the surface of the HPC layer, leading to a smooth surface. Finally, dye rejection and photoactivity test showed that NFFM-PCN showed better dye rejection property and photoactivity than other membranes, despite the lower photoactivity of C 3 N 4 due to the coverage effect of PAN. Overall, this primitive study provides a new method for preparing a new type of membrane for some potential applications.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Yong Zhang,Hongyu Jing,Bo Meng,Xiaohong Qian,Wantao Ying
The facile enrichment of glycopeptides or glycoproteins poses great challenges for glycoproteomic research. In this study, a novel hydrophilic material, named zwitterionic hydrophilic L-cysteine derivatized straticulate-C 3 N 4 composites (LCAC), were synthesized and evaluated for the enrichment of N-glycopeptides. LCAC exhibited good biocompatibility, excellent hydrophilicity and selectivity, by virtue of the large surface of C 3 N 4 and the zwitterionic property offered by cysteine. LCAC demonstrated excellent performance for N-glycopeptide enrichment with the sensitivity of 0.033 fmol/µL, selectivity of 1:100, and high recovery rate (∼85%). The performance of LCAC was demonstrated by the identification of 35 N-glycopeptides from IgG, as well as capturing 1809 human urine N-glycopeptides corresponding to 876 N-glycoproteins. Comparing the LCAC with our developed phenylboronic acid functionalized material showed a certain complementary due to the different binding mechanism. The simple production and enhanced hydrophilic properties make the material a promising choice for glycoproteomics researches.
研究领域:
蛋白质组学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongmei Chen,Yanyun Fan,Kexin Shi,Peng Wang,Chong-Chen Wang
It is of great significance to develop an efficient and stable photocatalyst for the photocatalytic decomposition of water to produce hydrogen. Within this paper, an effective and simple strategy was adopted to introduce pyrazine ring into graphite-like carbon nitride framework to realize efficient and stable hydrogen production process. After evaluation, the hydrogen production efficiency of the modified semiconductor material is 3.05 folds higher than the unmodified graphite-like phase carbon nitride, and an excellent stability performance was also achieved. It is proved that the light absorption ability of doped semiconductor composite nanomaterials was enhanced markedly by introducing 2-aminopyrazine into the carbon nitride structure. Meanwhile, the segregation efficiency of photo-induced carriers was obviously accelerated because the amino groups can work as hole trapping agents. Additionally, the introduced amino groups own Lewis alkalinity, which is in favour of the photoreduction. This work expands a new perspective of stable photocatalysts in the water split to produce hydrogen.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Dongya Li,Jie Zan,Liping Wu,Shiyu Zuo,Haiming Xu,Dongsheng Xia
The g-C3N4–Cu2O (CNCu2O-G) with a p-n heterojunction structure in the presence of glutamate was successfully developed through hydrothermal synthesis and high-temperature calcination. When addition the glutamate, the surface morphology of the heterojunction was regulated, and its specific surface area increased by a factor of approximately 1.5, and reaction sites were increased. Additionally, the charge recombination rate of the heterojunction was reduced, and the absorption band was red-shifted to 460 nm, leading to stronger heterostructure contact interfaces, thus the visible-light utilization efficiency was enhanced. The catalytic performance of the CNCu2O-G was very stable, with no significant change in the photocatalytic efficiency of CNCu2O-G after six recycles, the Fourier transform infrared patterns and X-ray diffraction of CNCu2O-G exhibited no significant changes after the photocatalytic reaction. Furthermore, electron paramagnetic resonance and free-radical removal experiments indicated that the holes and superoxide radicals were dominant species during the reaction.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Can Zhou,Meng Li,Junjie Ding,Hui Wang,Yi Zhao,Zixu Huang,Leqing Fan,Guijing Liu,Changmei Sun,Wenlong Xu
In recent years, the concept of sustainable development has encouraged the development and application of green, natural, and recyclable energy storage devices. Herein, using Ni(NO 3 ) 2 0.6 H 2 O and Co(NO 3 ) 2 0.6 H 2 O as raw material and K 2 S 2 O 8 as a vulcanizing agent, NiCo 2 S 4 nanomaterials@C 3 N 4 (NCS@C 3 N 4 ) composite was prepared by a one-step solvothermal method, in which the introduction of C 3 N 4 significantly improves the dispersion of NCS , while the petal-like NCS also expands the layer spacing of C 3 N 4 , which effectively alleviates the structural instability and promotes the exposure of stable active sites during charge and discharge. Physical structure and electrochemical characterizations showed that the NCS were distributed on the surface of the C 3 N 4 nanosheets , which reduced the stacking of the nanosheets and accelerated the charge transfer during the charging and discharging process. The specific capacity ( C sp ) of the NCS@C 3 N 4 composite electrode was up to 890.4 C/g at a current density of 1 A/g. In addition, the supercapacitor consisting of NCS@C 3 N 4 composite electrode had good cycling stability and still displayed excellent capacitance retention after 3000 cycles. The NCS@C 3 N 4 composite greatly optimizes the stability and extends the operating life of supercapacitors, which has a broad application potential in the field of energy storage devices.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Yuting Yin,Wenhao Jing,Feng Wang,Ya Liu,Liejin Guo
Coupling light absorber with an efficient cocatalyst is the most common way to fabricate composite photocatalyst . The light absorber supplies electrons and holes, while the cocatalyst domains chemical reactions. Inspired by the results from electrochemical CO 2 reduction, Cu-based materials are the most promising cocatalysts for photocatalytic CO 2 reduction. However, oxide-derived copper (OD-Cu) hasn't been introduced into photocatalytic systems yet, due to easily undergoing valence changes once exposed to air. Herein, we find that OD-Cu could be decorated on photocatalyst, polymeric C 3 N 4 (PCN), by a self-designed in-situ electroreduction method. The as-prepared OD-Cu/PCN presents better visible light absorption than the one without in-situ electroreduction and prefers multi-carbon products. According to CO 2 RR measurements, the highest selectivity to C 2 H 5 OH is 58%. Density functional theory calculation further indicates that the unique structure between OD-Cu and PCN leads to a low energy barrier of C–C coupling due to the enhanced *CO dimerization and thus promotes the production of C 2 H 5 OH. Moreover, this optimized sample achieves a solar-to-fuel efficiency, of up to 0.94%, which is 1.69 times the pristine PCN.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
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IF 4.7
Jingkun Zhao,Meijie Gao,Zixin Wu,Siyu Gao,Zhongyan Hu,Shangru Zhai,Qingda An,Zuoyi Xiao,Gongbing Zhou
The extensive therapeutic use of tetracycline (TC) in human and veterinary healthcare systems has resulted in notable environmental persistence, with detectable residues increasingly documented in aquatic ecosystems worldwide. While photocatalytic technology has been widely applied for TC degradation, improving the photocatalytic activity of catalysts remains a critical challenge. Improving charge separation efficiency is a key approach to enhance the activity of photocatalysts. In this work, we successfully coupled g-C 3 N 4 and CaMoO 4 on 3D porous carbon via a hydrothermal method. The photocatalytic properties of the composites were determined through the degradation of TC under visible light. Under simulated visible light irradiation, the results demonstrated that the g-C 3 N 4 /CaMoO 4 @C achieved 94.8% degradation of TC under 90 min of light exposure, significantly outperforming pure g-C 3 N 4 and pure CaMoO 4 , which achieved only 39.7% and 39.2% degradation in the same period. And the g-C 3 N 4 /CaMoO 4 @C achieved 73.59% removal of total organic carbon. The photocatalytic activity was investigated by adjusting key parameters, including TC solution pH, initial concentration, and catalyst dosage. The morphology, structure and composition of the catalysts were characterized by XRD, XPS and TEM characterization techniques, and the reasons for the improved performance of the composite photocatalysts were analyzed by combining the results of UV-Vis and PL characterizations, and the photocatalytic mechanism of the catalysts was further explored by ESR characterization.
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
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2022
·Vol. 219
·期 22
·2200334
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IF 2.17
Tao Jin,Chengbao Liu,Feng Chen,Junchao Qian,Yongbin Qiu,Xianrong Meng,Zhigang Chen
Photocatalytic degradation of organic pollutants is considered an ideal method to solve the global environmental pollution problem. In this method, photocatalytic materials are regarded as the key factor. As an n-type photocatalytic material, graphitic carbon nitride (g-C 3 N 4 ) has attracted much attention due to its suitable bandgap, nontoxicity, and high photostability. However, g-C 3 N 4 still has defects such as insufficient visible light absorption, low specific surface area, and easy recombination of photogenerated electron–hole pairs, which lead to the poor photocatalytic performance of g-C 3 N 4 . Herein, to solve the above problems, thiourea, lemon juice, and tin chloride pentahydrate are used as precursors, while carbon quantum dots (CQDs) are used as electron mediators, and the third phase SnS 2 is introduced by a hydrothermal and ultrasonic composite method. SnS 2 /CQDs/g-C 3 N 4 composites with Z-type heterojunction are successfully prepared. The results show that the SnS 2 /CQDs/g-C 3 N 4 has a 2D0D2D structure, which effectively inhibits the recombination of photogenerated electron–hole pairs, making the material have better photocatalytic degradation activity for Rhodamine B (RhB). When the mass ratio of SnS 2 is 15%, the photocatalytic degradation efficiency of RhB by the composite reaches the best, which is 87.8%. After four cycles, the photocatalytic degradation efficiency of the 15% SnS 2 /CQDs/g-C 3 N 4 composite still remains at 82.9%.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
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IF 6.785
Xiaoqing Sun,Jing Lei,Yan Jin,Baoxin Li
Most of the known chemiluminescence (CL) systems are flash-type, whereas a CL system with long-lasting and strong emission is very favorable for accurate CL quantitative analysis and imaging assays. In this work, we found that the oxidized g-C3N4 (g-CNOX) could trigger luminol-H2O2 to produce a long-lasting and intense CL emission. The CL emission lasted for over 10 min and could be observed by the naked eye in a dark room. By means of a CL spectrum, X-ray photoelectron spectra, and electron spin resonance spectra, the possible mechanism of this CL reaction was proposed. This strong and long-duration CL emission was attributed to the high catalytic activity of g-CNOX nanosheets and continuous generation of reactive oxygen species from H2O2 on g-CNOX surface. Taking full advantage of the long-lasting CL property of this system, we proposed one “non-in-situ mixing” mode of CL measurement. Compared with the traditional “in-situ mixing” CL measurement mode, this measurement mode was convenient to operate and had good reproducibility. This work not only provides a long-lasting CL reaction but also deepens the understanding of the structure and properties of g-C3N4 material.
研究领域:
化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Qianfan Zhou,Kunpeng Qian,Jianhui Fang,Miao Miao,Shaomei Cao,Xin Feng
With the mushrooming of smart electronic devices, ultrathin Ti 3 C 2 T x MXene based EMI shielding materials with long term durability have aroused much interest. Herein, 2D Ti 3 C 2 T x /g-C 3 N 4 heterojunction films were firstly assembled using cellulose nanofibrils (CNF) as green binder via a solution-based pressured-filtration process. The heterojunction film with Ti 3 C 2 T x /g-C 3 N 4 mass ratio of 5:1 (28.20 µm in thick) exhibited distinguished performance with EMI shielding effectiveness of 42.99 dB in X-band and high tensile strength of 23.85 MPa. Specially, the generation of photo-electrons from g-C 3 N 4 nanosheets reduced TiO 2 into lower valence states under 365 nm UV light-irritation, resulting in lower loss on electrical conductivity as well as EMI shielding performance compared to their unilluminated counterparts. The reduction on TiO 2 offered by the g-C 3 N 4 enables the heterojunction film to be considered as a promising alternative EMI shielding material for future potential applications, because it can run long time just need UV light modulation.
研究领域:
材料科学
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电子工程
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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）