ACS Applied Energy Materials
·
2021
·
IF 6.024
Jun Zhang,Shuai Shao,Desen Zhou,Tingmin Di,Tielin Wang
Two-dimensional (2D) layered nanocomposite provides a surface-to-surface heterojunction, which is an effective way to improve the photocatalytic performance because larger contact areas can promote the separation rate of interfacial charge carriers. In this study, Co(OH)2/g-C3N4/Ni(OH)2 2D layered photocatalysts have been successfully synthesized through a simple precipitation–hydrothermal method. The composite achieves a high H2-production rate of 899 μmol·h–1·g–1, which exceeds the rate of samples only coupled with Co(OH)2 and Ni(OH)2 by 4.0 and 1.9 times, respectively. In addition, the activity is even higher than that of the optimized Pt-g-C3N4 sample (1 wt. % Pt–C). The characterization results reveal the close contact of g-C3N4 and Ni/Co hydroxides, and such a face-to-face contact can greatly improve the interfacial charge-transfer rate, resulting in a high photocatalytic performance. This work demonstrates a simple way to enhance the photocatalytic H2 production of g-C3N4 under the cooperative effect of Co(OH)2 and Ni(OH)2 and provides novel insights into constructing other 2D ternary heterostructure nanocomposites.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yu Cao,Luona Wang,Chengyin Wang,Xiaoya Hu,Yunling Liu,Guoxiu Wang
A photoelectrochemical (PEC) sensor based on hierarchically porous Cu-BTC/g-C 3 N 4 nanosheet (Cu-BTC/CN-NS, BTC = benzene-1,3,5-tricarboxylic acid) material was constructed for the first time. As a composite material, the hierarchically porous Cu-BTC can help to efficiently capture suitable pesticide molecules and accelerate signal transmission, while CN-NS possesses good optical performance. Under the irradiation of visible light, the Cu metal center can coordinate with the added glyphosate to form Cu-glyphosate complexes, leading to the increased steric hindrance of electron transfer and consequently resulted in an obvious decrease in photocurrent . Through this strategy, the constructed sensor can realize the detection of glyphosate from non-electroactive to electroactive. The results indicate that this photoelectrochemical sensor has a low detection limit of 1.3 × 10 −13 mol L −1 and a wide detection range (1.0 × 10 −12 –1.0 × 10 −8 mol L −1 and 1.0 × 10 −8 ∼ 1.0 × 10 −3 mol L −1 ). Furthermore, this Cu-BTC/CN-NS based sensor has the characteristics of short detection time and easy operation. It has great potential applications in photoelectrochemical analysis.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jia-Yu Lai,Wei-De Zhang,Yu-Xiang Yu
sp hybrid carbon is emerging as a promising unit for covalent modification of organic frameworks and conductive polymers, and has been widely concerned in conjugated polymer catalysts because it can be used to construct π-electron conjugated system. Herein, we provide a simple and effective post reaction strategy to activate g-C 3 N 4 via coupling reactions. The grafted g-C 3 N 4 exhibits improved light absorption and separation of charges, and better water dispersibility along with increased co-catalyst loading sites, which accelerate photocatalytic hydrogen evolution. Photocatalytic H 2 evolution activity of UCN-BTD and UCN-BF, in which terminal amino groups are grafted with 2,1,3-benzothiadiazole,5-(1-propyn-1-yl) or 2,1,3-benzoxadiazole,5-(1-propyn-1-yl), reveals the important role of sp hybrid carbon and electronegativity of the acceptor. The optimized UCN-BTD photocatalyst showed a significant improvement in photocatalytic hydrogen evolution performance (122 μmol·h −1 ), which is nearly five times of that of the pristine g-C 3 N 4 . This work provides insights for the preparation of g-C 3 N 4 -based donor-π-acceptor unit constructed with different conjugated structures.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Herein, TiO 2 /g-C 3 N 4 /Ag (TCA) composites were successfully fabricated by a simple two-step method and wet chemical reduction. Titanium isopropoxide and melamine were used as precursors to prepare TiO 2 /g-C 3 N 4 heterojunction composites by simple stirring and calcining. Then, different mass fractions of AgNPs were decorated on the surface of the above composites by wet chemical reduction to obtain a sequence of TiO 2 /g-C 3 N 4 /Ag (TCA) composites. TCA composites were analyzed by XRD, TEM, HRTEM, EDS, XPS, BET, Raman spectroscopy, PL spectrum and UV–vis diffuse reflectance spectrum. The results showed that TCA composites had remarkable enhancement in the separation of photogenerated carriers and the utilization of light, which was as result of the coordination of the three components. For photodegradation of RhB or phenol under simulated sunlight, TCA-1 samples revealed the best photocatalytic degradation performance, and the corresponding degradation rates were 91.4% at 60 min and 90.0% at 120 min, respectively. Moreover, TCA-1 composites maintained superior degradation performance after reusability tests, indicating that TCA-1 composites had excellent photochemical stability. For experimental results, a possible photodegradation mechanism of TCA composites was also proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Chao Zhang,Jiandong Liu,Xiayun Huang,Daoyong Chen,Shiai Xu
Graphene-like g-C3N4 nanosheets (NSs) have been successfully synthesized with a modified polymerization process of melamine by cocondensation with volatile salts. Volatile ammonium salts such as urea–NH4Cl/(NH4)2SO4/(NH4)3PO4 were added with melamine to modulate the thermodynamic process during polymerization and optimize the structure formation in situ. The surface area, surface structure, and surface charge state of the obtained g-C3N4 NSs could be controlled by simply adjusting the mass ratio of the melamine/volatile ammonium salt. As a consequence, the g-C3N4 NSs exhibited much higher activity than bulk g-C3N4 for the photocatalytic degradation of target pollutants (rhodamine B, methylene blue, and methyl orange), and it also exhibited greater hydrogen evolution under visible light irradiation with an optimal melamine/volatile ammonium salt ratio. The as-prepared g-C3N4 NSs with melamine–urea–NH4Cl showed the highest visible light photocatalytic H2 production activity of 1853.8 μmol·h–1·g–1, which is 9.4 times higher than that of bulk g-C3N4 from melamine. The present study reveals that the synergistic effect of the enhanced surface area, surface structure, and surface charge state is the key for the enhancement of photocatalytic degradation and hydrogen evolution, which could be controlled by the proposed strategy. The result is a good explanation for the hypothesis that adding properly selected monomers can truly regulate the polymerization process of melamine, which is beneficial for obtaining g-C3N4 NSs without molecular self-assembly. Considering the inexpensive feedstocks used, a simple synthetic controlling method provides an opportunity for the rational design and synthesis, making it decidedly appealing for large-scale production of highly photocatalytic, visible-sensitizable, metal-free g-C3N4 photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2014
·
IF 4.331
Fa-tang Li,Ye Zhao,Qing Wang,Xiao-jing Wang,Ying-juan Hao,Rui-hong Liu,Dishun Zhao
Novel Al 2 O 3 /g-C 3 N 4 heterojunction photocatalysts were fabricated through ultrasonic dispersion method. Al 2 O 3 , obtained via solution combustion, contained amorphous ingredient with lots of defect sites and was used as active component for transferring photo-induced electrons of g-C 3 N 4 . G-C 3 N 4 was grafted surface hydroxyl groups in the presence of ammonia aqueous solution to combine with Al 2 O 3 possessing positive charges via hydrogen bond . The XRD, SEM, element map, TEM , HRTEM, FT-IR, and XPS results indicate that these synthesized materials are two-phase hybrids of Al 2 O 3 and g-C 3 N 4 with interaction. The photocatalytic results for the degradation of rhodamine B (RhB) indicate that the most active heterojunction proportion is 60 wt.% g-C 3 N 4 :40 wt.% Al 2 O 3 , the visible light photocatalytic activity of which is 3.8 times that of a mechanical mixture. The enhanced performance is attributed to the high separation efficiency of photo-induced electrons from the LUMO of g-C 3 N 4 injected into the defect sites of Al 2 O 3 , which is verified by photoluminescence spectroscopy (PL) and surface photovoltage (SPV) measurements. The electron paramagnetic resonance (EPR) signals and radical scavengers trapping experiments reveal holes (h + ) and superoxide anion radical ( O 2 − ) are the main active species responsible for the degradation of RhB.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Talanta Open
·
2021
·
IF 0
Yuwen Pu,Yalin Wu,Zhihui Yu,Liping Lu,Xiayan Wang
The high adsorption capacity of Fe 3 O 4 and C 3 N 4 for heavy metals and the amalgam effect of Bi 2 O 3 were exploited using a Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 -modified glassy carbon electrode (GCE) for the determination of Cd 2+ and Pb 2+ . The electrochemical response performance of the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE was studied by square-wave anodic stripping voltammetry. The electrochemical conditions were optimized, including the pH of the buffer solution, content of Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 on the electrode surface, deposition potential and deposition time. Under optimum conditions, the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor shows a linear response from 0.01 μmol/L to 3 μmol/L. The minimum detectable quantity for Cd 2+ and Pb 2+ are 3 × 10 −9 mol/L and 1 × 10 −9 mol/L, respectively. Interference studies were carried out. The sensitivity of the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor to Cd 2+ and Pb 2+ does not significantly change in the presence of coexisting heavy metal ions. The Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor exhibits good stability and repeatability. The Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor was used to detect Cd 2+ and Pb 2+ in river water samples to demonstrate its real-world application.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 18
·11069-11076
·
IF 10.733
Zongjie Sun,Yuhan Li,Shuyang Zhang,Lei Shi,Hu Wu,Huaitian Bu,Shujiang Ding
Solid polymer electrolytes (SPEs) are expected to improve the safety and performance of lithium ion batteries (LIB). However, the low ionic conductivity limit the further application of PEO based electrolytes. Herein, g-C3N4 nanosheets is proposed as a novel filler for PEO based electrolytes. The addition of g-C3N4 improves the electrical properties (ionic conductivity, lithium ion transference number and electrochemical window), mechanical properties and thermal stability of the composite electrolyte. The two-dimensional g-C3N4 forms an effective ion transport network in the composite electrolyte. In addition, the surface atoms of the g-C3N4 interact with groups in the lithium salt, promoting further dissociation of the lithium salt. Furthermore, the all solid state batteries assembled by the g-C3N4 composite electrolyte exhibited good cycle performance at 60 °C (remained at 155 mA h g−1 after 100 cycles). Owing to the simple synthesis and environmental friendliness, g-C3N4 nanosheets has a certain practical prospect as a filler for solid polymer electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Road Materials and Pavement Design
·
2019
·
IF 1.98
Xuejuan Cao,Mei Deng,Boming Tang,Yongjie Ding,Xiaoyu Yang
Nitric oxide (NO) emitted from vehicle exhausts are associated with adverse health effects on the public. This study prepared a graphitic carbon nitride (g-C3N4)/TiO2 composite using melamine and titanium dioxide (TiO2) and then applied the composite on chip seal for the photocatalytic removal of NO. The g-C3N4/TiO2 composite was synthesised by an ultrasonic-assisted solid-phase synthetic method. The results of X-ray powder diffraction, Fourier-transform infrared spectroscopy, and a scanning electron microscope indicated that g-C3N4 and TiO2 were successfully synthesised and most of the sheet structures of g-C3N4 were attached by approximately spherical TiO2 particles. The UV–Vis and PL characterisation suggested that optical absorption range of TiO2 was broadened and the separation of electronic-holes was hindered, which contributed significantly to the enhancement of the visible-light photocatalytic activity. The loading capacity of 0.0092 kg/m2 g-C3N4/TiO2 composite on chip seal specimens had the highest NO removal efficiency of 31.41% within 30 min.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22830-22840
·
IF 3.925
Jiajun Nong,Yuexiang Jin,Jun Tan,Hongxia Ma,Yuan Lian
Realizing highly efficient utilization of solar energy for solving problems of environmental pollution and energy shortage has attracted increasing attention. Herein, Z-scheme two-dimensional (2D)/2D NiCo-LDH/g-C3N4 (LDH/CN) heterojunction composites were synthesized, which showed enhanced photocatalytic performance for tetracycline hydrochloride (TC) degradation and hydrogen (H2) generation under visible light irradiation. A 2D/2D heterojunction structure was formed between NiCo-LDH nanosheets (LDH) and g-C3N4 (CN), which was beneficial for the effective separation of photogenerated charge carriers. The active species of hydroxyl (˙OH), superoxide (˙O2−) and hole (h+) radicals contributed to TC photodegradation. The optimum photocatalyst showed a remarkably enhanced photocatalytic capability with a hydrogen generation rate of 451.7 μmol g−1 h−1. The improved photocatalytic activities may be attributed to the synergistic effects of the increased absorption of visible light, the separation efficiency of carriers and the 2D/2D heterostructure. A Z-scheme photocatalytic mechanism was proposed for the LDH/CN composite, showing dual advantages of a high redox ability and efficient charge carrier separation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 17
·6753-6764
·
IF 3.069
Qiannan Li,Yuguo Xia,Kangliang Wei,Xiaotong Ding,Shun Dong,Xiuling Jiao,Dairong Chen
Utilizing surface polarization to improve the separation efficiency of photoinduced carriers is considered to be an effective strategy to enhance the photocatalytic activity. Herein, a novel nonprecious metal-based P-doped g-C3N4 (PCN)/polyaniline (PANI)/BaTiO3 (BTO) (PPB) ternary photocatalyst with a hollow architecture was rationally designed and prepared by a combined wet-chemical and thermal treatment strategy. Except for the Z-scheme involved in PCN and PANI, the vertical polarization provided by ferroelectric BTO further improved the separation efficiency of the photoinduced charge carrier, resulting in an enhanced visible-light photocatalytic hydrogen production activity of 602 μmol h−1 g−1, which was 21-fold higher than that of pristine g-C3N4, and an apparent quantum efficiency of 4.16% at 420 nm. In addition, benefitting from this ternary heterojunction, the photoinduced electrons were concentrated on the intermediate p-type PANI while holes were left on the lateral n-type PCN involved in the Z-scheme, resulting in the retention of high oxidation–reduction potentials. Moreover, this approach to enhance the photocatalytic activity by constructing a Z-scheme heterojunction and surface polarization could expand to other photosystems, which provides a new avenue for the rational design and the synthesis of novel photocatalysts.
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yihua Tang,Jingjing Chen,Xiao Wang,Xinxin Wang,Yang Zhao,Zhiyong Mao,Dajian Wang
Nitrogen atoms doping was widely recognized as the promising technique to improve the electrochemical performances of various carbonaceous materials application for energy storage devices. Herein, we reported a facial fabrication of highly N-doped graphene-like carbon (NGC) through the carbonization of a mixture containing polypyrrole and g-C 3 N 4 nanosheets , which was employed as sacrificial template and extra nitrogen source simultaneously. The resultant NGC material integrate a range of excellent features including high nitrogen contents (17.54 at%), large specific surface areas (635.73 m 2 g −1 ) and abundant mesopores with high pore volume (1.9483 cm 3 g −1 ). As anode material in Li-ions batteries, the NGC material exhibits an promising initial discharge capacity of 2749 mAh g −1 at a current density of 50 mA g −1 and encouraging cycling stability (1143 mAh g −1 after 200 cycles) as well as excellent rate performance (440 mAh g −1 at 2 A g −1 ). This feasible fabrication presents a new guidance to exploit high performance N-doped carbon materials for the applications in energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）