ADVANCED FUNCTIONAL MATERIALS
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2017
·Vol. 27
·期 22
·1700653
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IF 12.124
Jia Yan,Marco-Tulio F. Rodrigues,Zhilong Song,Hongping Li,Hui Xu,Huan Liu,Jingjie Wu,Yuanguo Xu,Yanhua Song,Yang Liu,Peng Yu,Wei Yang,Robert Vajtai,Huaming Li,Shouqi Yuan,Pulickel M. Ajayan
Many unique properties arise when the 3D stacking of layered materials is disrupted, originating nanostructures. Stabilization, and further reorganization of these individual layers into complex 3D structures, can be essential to allow these properties to persist in macroscopic systems. It is demonstrated that a simple hydrothermal process, assisted by ionic liquids (ILs), can convert bulk g-C 3 N 4 into a stable hydrogel. The gelation occurs through delamination of the layered structure, driven by particular interactions between the IL and the carbon nitride sheets, forming an amphiphilic foam-like network. This study employs spectroscopic and computational tools to unravel the gelation mechanism, and provides a rational approach toward the stabilization of 2D materials in hydrogels. The solution-processable hydrogels can also be used as building blocks of complex devices. Chemiresistive gas sensors employing g-C 3 N 4 3D hydrogels exhibit superior response at room temperature, enabling effective gas sensing under low power conditions.
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Nano Energy
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2016
·
IF 11.553
Lihua Yao,Ding Wei,Yuanman Ni,Dongpeng Yan,Changwen Hu
The construction of new semiconductor photocatalysts toward high-efficiency splitting water has played an important role in developing sustainable and clean hydrogen energy . In this work, new type of micro/nano-sized hybrids were synthesized based on the assembly of 0D Cd 0.5 Zn 0.5 S quantum dots (QDs, size: ca. 5 nm) onto 2D graphitic carbon nitride ( g -C 3 N 4 ) ultrathin microribbons (thickness: ca. 4 nm) via an in-situ growth hydrothermal method . The Cd 0.5 Zn 0.5 S 32 wt%@C 3 N 4 composite exhibits the highest visible-light-driven H 2 -generation rate of 33.41 mmol h −1 g −1 without any noble-metal as cocatalyst , and the apparent quantum efficiency is 46.65% at 450 nm. Such H 2 -generation rate is higher than the pristine g -C 3 N 4 and Cd 0.5 Zn 0.5 S by a factor of 27.39 and 9.18 respectively, which is significantly enhanced compared with most as-reported noble-metal-free semiconductor catalysts to date. In addition, compared with the pristine Cd 0.5 Zn 0.5 S, the photocatalytical stability of Cd 0.5 Zn 0.5 S QDs@C 3 N 4 is highly improved. The enhanced H 2 -generation performance can be attributed to the well-matched energy level and strong electronic coupling between two components at the g- C 3 N 4 interface as well as enhanced visible-light absorption. The uniform dispersion of Cd 0.5 Zn 0.5 S QDs onto the g -C 3 N 4 ultrathin microribbons also facilitates the depression of electron-hole recombination from potential aggregation of Cd 0.5 Zn 0.5 S. Therefore, this work supplies an effective way to obtain promising 2D micro/nanostructures for high-efficiency visible light-induced H 2 -generation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Xue Yu,Peiwen Wu,Caixia Qi,Junjie Shi,Lijuan Feng,Chunhu Li,Liang Wang
Tremendous demands for photocatalysts with high chemical activity and stability, low cost and capability of response to visible-light have stimulated intensive research on developing versatile materials with special photocatalytic applications. Here we report a novel g-C 3 N 4 /BiOBr-RGO aerogel ternary-component heterojunction photocatalyst for degradation of RhB under visible light irradiation. As a result of synergistic effect of the g-C 3 N 4 , BiOBr and RGO, the hybrid photocatalysts exhibit better activity than the single component catalysts (pure g-C 3 N 4 , BiOBr) and bi-component catalysts (g-C 3 N 4 /BiOBr) in the same time period (60 min). The enhanced photocatalytic performance originates from a novel nanoarchitecture in which BiOBr exposed more active plane and RGO worked as a conductive support further improved the photogenerated charge separation. Moreover, due to the 3D structure of RGO after reaction the photocatalysts can be easily removed from the treated solution and reused, which opens up a way for the recycling applications of catalysts in aqueous reaction systems.
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APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Ruirui Hao,Guohong Wang,Chuanjia Jiang,Hua Tang,Qingchuan Xu
Semiconductor-based photocatalysis is a promising method for degradation of environmental pollutants, but the activity of most widely used photocatalysts such as titania (TiO 2 ) is still unsatisfactory under visible light. Herein, we synthesized a highly efficient visible-light-responsive heterojunction catalysts based on graphitic carbon nitride (g-C 3 N 4 ) and TiO 2 . The g-C 3 N 4 /TiO 2 heterojunction composites with high specific surface area were prepared via in situ hydrothermal synthesis followed by calcination , using titanium tetrachloride (TiCl 4 ) and melamine as precursors. Interesting, HCl from the hydrolysis of TiCl 4 served as the proton source to acidify the melamine. The g-C 3 N 4 /TiO 2 heterojunction composites exhibited higher photocatalytic performance for decomposition of Rhodamine B (RhB) than pure g-C 3 N 4 or TiO 2 under visible light irradiation. The high activity can be ascribed to the high specific surface area (up to 115.6 m 2 g −1 ) of the g-C 3 N 4 /TiO 2 composites and a synergistic heterojunction structure between TiO 2 and g-C 3 N 4 . Moreover, the photocatalytic performances of the g-C 3 N 4 /TiO 2 composites rely on the content of melamine in the synthesis precursors: with an optimum melamine content (3 g for 0.5 mL of TiCl 4 ), the sample showed the highest photocatalytic performance, which is superior to pure TiO 2 and g-C 3 N 4 by a factor of 18.7 and 3.5, respectively. Active species trapping experiments revealed that superoxide radicals and photogenerated holes played crucial roles in the photocatalytic reactions. The results will provide new ideas for the smart design and development of g-C 3 N 4 -based highly active photocatalysts with ultrahigh specific surface area for environmental and energy applications.
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ChemCatChem
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2016
·Vol. 8
·期 22
·3527-3535
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IF 4.724
Feng-Yun Su,Cheng-Qun Xu,Yu-Xiang Yu,Wei-De Zhang
Graphical Carbon self-doped g-C 3 N 4 nanosheets were synthesized in a simple way by a one-step calcination of a ternary supramolecular network of cyanuric acid, ethylene glycol (EG), and melamine. Carbon doping resulted in a distorted framework and induced the activation of n–π* electronic transitions of the C-g-C 3 N 4 nanosheets. The obtained C-g-C 3 N 4 displayed high activity for photocatalytic H 2 evolution owing to the extended light harvesting and faster separation of photogenerated electrons and holes. This paper reports a facile one-pot synthesis strategy to prepare carbon self-doped g-C 3 N 4 (C-g-C 3 N 4 ) nanosheets by using supramolecular networks consisting of cyanuric acid, ethylene glycol (EG), and melamine (CEM) bonded through hydrogen bonding as the thermal polycondensation precursor, in which EG serves as a solvent for cyanuric acid and melamine, and as a source of the doped carbon simultaneously. The threedimensional structure of CEM resulted in the distortion of C-g-C 3 N 4 , which is capable of motivating the n–π* electronic transition involving the N lone pairs to give an additional absorption region from 450 to 600 nm. The hydrogen evolution rate of C-g-C 3 N 4 reaches 73.09 μmol h −1 , which is about 15 times of that over the g-C 3 N 4 obtained from direct thermal polycondensation of melamine owing to its extended light harvesting and faster separation of photogenerated electrons and holes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Yanyang Shang,Xi Chen,Wenwen Liu,Pengfei Tan,Haoyun Chen,Laidi Wu,Cheng Ma,Xiang Xiong,Jun Pan
A facile microemulsion-assisted co-precipitation method was carried out to synthesize nano-sized Ag 2 CrO 4 highly dispersed on the surface of porous g-C 3 N 4 as high-efficiency visible-light-driven composite photocatalysts for the first time. The structure and morphology of the composites were systematically characterized by various techniques. Compared with Ag 2 CrO 4 and g-C 3 N 4 , g-C 3 N 4 /Ag 2 CrO 4 composites showed a dramatically increased photocatalytic activity in degradation of rhodamine B (RhB) and methylene blue (MB). The optimum mass ratio of the Ag 2 CrO 4 to g-C 3 N 4 was about 30 wt%, the degradation rate of which were 6.1 (7.9) and 9.7 (15.2) times higher than pure Ag 2 CrO 4 and g-C 3 N 4 in RhB (MB) degradation, respectively. The excellent photocatalytic activity and stability mainly benefited from the synergistic effect including smaller Ag 2 CrO 4 particle size, high specific surface area of the composites and matched band potentials which not only promoted the separation of photon-generated charge carriers, but also inhibited the photocorrosion of Ag 2 CrO 4 . Further study revealed that the photocatalytic mechanism followed a Z-scheme which provided an efficient transfer pathway for charge carriers meanwhile endowed the composites with strong oxidation and reduction ability. Hence the porous g-C 3 N 4 /Ag 2 CrO 4 composites are potential in environmental purification.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Zhiwei Li,Guodong Jiang,Zihao Zhang,Ye Wu,Yinhui Han
Photocatalysts Phosphorus-Doped g-C 3 N 4 (P(x%)-g-C 3 N 4 ) were successfully prepared by a two-step method using melamine and phosphonitrilic chloride trimer (Cl 6 N 3 P 3 ). Then, the Phosphorus-doped g-C 3 N 4 sheets coated with TiO 2 nanoparticles (P(x%)-g-C 3 N 4 /TiO 2 ) were prepared by solvent-thermal method. The as-prepared P(x%)-g-C 3 N 4 /TiO 2 composites showed enhanced light absorption and photocatalytic properties in visible light region. The morphology of g-C 3 N 4 nanosheets and square flake TiO 2 nanoparticles were analyzed with field emission scanning electron microscopy (FESEM) and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) proved that the P-C bonds were generated in P(x%)-g-C 3 N 4 . Photoluminescence (PL) spectra revealed that the phosphorus doping improved the separation and transfer of photogenerated electrons and holes in P(x%)-g-C 3 N 4 , UV–vis diffuse reflectance spectra (UV-vis DRS) indicated that the P(x%)-g-C 3 N 4 /TiO 2 heterostructure enhanced the absorption of visible light. The photocatalytic activity of the P(x%)-g-C 3 N 4 was evaluated by photocatalytic degradation of Methyl Blue (MB) under visible light irradiation. The result indicated that the P(0.1%)-g-C 3 N 4 /TiO 2 composite present considerably high photocatalytic degradation activities on MB, and the degradation of MB by P(0.1%)-g-C 3 N 4 /TiO 2 were 5.1 times and 2.9 times as high as that of g-C 3 N 4 and P25, respectively. At the end of article, a possible photocatalytic mechanism was discussed based on the experimental results.
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Materials Horizons
·
2024
·
IF 12.2
Saijun Wu,Minglong Yan,Yinghao Wu,Yangmin Wu,Xijian Lan,Jianjun Cheng,Wenjie Zhao
Inhibiting the adhesion and growth of marine microorganisms through photocatalysis is a potentially efficient and environmentally friendly antifouling strategy. However, the undesired “shading effect” caused by resin coatings and microbial deposition reduces the utilization of the catalysts and leads to a failure in the antifouling active substance on the coating surface. Here, we successfully developed a composite coating (DPC-x) combining g-C3N4 nanosheet (g-C-NS) photocatalysts with degradable green poly-Schiff base resins, which integrates the dual functions of enhanced dynamic self-renewal and photocatalytic antibacterial activities towards long-term anti-biofouling. The controllable and complete degradability of the poly-Schiff base polymer chains and the self-renewal mechanism of the DPC-x coating exposed the internal g-C-NS, which provided a constant stream of photocatalytic reactive interfaces for 100% utilization and release of the photocatalysts. g-C-NS were homogeneously dispersed in the degradable resin coating, significantly enhancing and adjusting the self-renewal rate of the poly-Schiff base resin coating in visible light. The degradation reaction rate of DPC-0.2 (20 wt% g-C-NS) was 40 times that of DPC, thus improving the capabilities of surface self-renewal and fouling-release. Due to the synergistic antifouling mechanism of the efficient antibacterial properties and the enhanced degradation/self-renewal, the antimicrobial rates of DPC and DPC-0.2 were 94.58% and 99.31% in the dark, and 98.2% and 99.87% in visible light. DPC-x has excellent all-weather antimicrobial efficacy and could offer a new perspective on eco-friendly marine antifouling strategies.
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PubMed
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yingjie Wang,Jinhang Zou,Congyu Zhao,Haipeng Jiang,Yuhuan Song,Le Zhang,Xin Li,Fengyou Wang,Lin Fan,Xiaoyan Liu,Maobin Wei,Lili Yang
Effective defect passivation and efficient charge transfer within polycrystalline perovskite grains and corresponding boundaries are necessary to achieve highly efficient perovskite solar cells (PSCs). Herein, focusing on the boundary location of g-C3N4 during the crystallization modulation on perovskite, molecular engineering of 4-carboxyl-3-fluorophenylboronic acid (BF) on g-C3N4 was designed to obtain a novel additive named BFCN. With the help of the strong bonding ability of BF with both g-C3N4 and perovskite and favorable intramolecular charge transfer within BFCN, not only has the crystal quality of perovskite films been improved due to the effective defects passivation, but the charge transfer has also been greatly accelerated due to the formation of additional charge transfer channels on the grain boundaries. As a result, the champion BFCN-based PSCs achieve the highest photoelectric conversion efficiency (PCE) of 23.71% with good stability.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Renpeng Du,Zimuran Yimuran,Huayang Cai,Bosen Zhou,Yingying Ning,Wenxiang Ping,Baojiang Jiang,Jingping Ge
The interest in nanocomposite films incorporating edible ingredients and active nanoparticles has surged due to their potential to enhance food quality and prolong shelf-life. This research focused on developing innovative exopolysaccharides (EPS)/potato starch (PS) nanocomposite films integrated with g-C 3 N 4 and AgNO 3 . Extensive analysis was conducted to assess the microstructure, physical attributes and antimicrobial properties of these films. Fourier transform infrared (FT-IR) analysis revealed electrostatic and hydrogen bonding interactions within the film components. X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS) data indicated a high level of compatibility among EPS, PS, g-C 3 N 4 , and AgNO 3 , with no new absorption peaks or characteristic signals of C 3 N 4 and Ag appearing in the nanocomposite films patterns. The thickness, water solubility and water vapor permeability (WVP) of the EPS-PS-C 3 N 4 -Ag nanocomposite film increased due to the addition of g-C 3 N 4 , reached 0.31 ± 0.03 nm, 36.61 ± 1.76 % and 1.42 ± 0.34 × 10 −10 g −1 s −1 Pa −1 , respectively. While transparency, swelling degree, and oxygen permeability (OP) significantly decreased, reached 26.18 ± 2.38 %, 63.01 ± 2.51 % and 41.98 ± 1.28 %, respectively. Scanning electron microscopy (SEM) and atomic force microscope (AFM) images depicted an augmented roughness and porosity on the film surface upon integration of g-C 3 N 4 and AgNO 3 . Moreover, the EPS-PS-C 3 N 4 -Ag nanocomposite film displayed enhanced mechanical strength due to the presence of g-C 3 N 4 . The melting temperature (Tm) of EPS-PS-C 3 N 4 -Ag nanocomposite film was 313.3 °C, the removal rates of DPPH and ABTS was 66.11 ± 2.87 % and 45.09 ± 1.23 % respectively. Significant inhibition of microbial growth was observed in film containing g-C 3 N 4 and AgNO 3 , which demonstrated no toxicity towards NIH-33 cells, suggesting their potential application as promising active packaging material for food preservation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Bin Zhang,Shuangqing Xia,Zhenyi Wang,Wenqian Li,Boda Li,Haochen Zhang,Yanjun Xin,Kai Wu,Jun Ma,Xu He
Permanganate [Mn(VII)] needs to be activated to improve its reactivity towards refractory organic contaminants in practice. Herein, visible light (VL) and graphitic carbon nitride (g-C 3 N 4 ) were introduced to enhance the activation of Mn(VII) for the first time. Sulfamethoxazole (SMX) can be degraded effectively by VL/Mn(VII)/g-C 3 N 4 system in neutral and alkaline environments. Different from conventional Mn(VII) activation and photocatalytic processes, the performance of VL/Mn(VII)/g-C 3 N 4 system in various real water samples was superior than Milli-Q water. Mn(V) was found to be the dominant active species responsible for SMX degradation. Photo-induced electron (e cb – ) of g-C 3 N 4 under VL irradiation was proved to be the initiator of Mn(VII) activation. Density functional theory calculations revealed the strong affinity of g-C 3 N 4 for Mn(VII), which can resist the interference of water substrates on the Mn(VII) activation process by photo-induced e cb – . This work deepens the understanding of reactive manganese intermediates in the Mn(VII) activation system.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Mengmeng Chen,Neng Hu,Weijia Wang,Lin Lei,Huiqing Fan,Peter Müller-Buschbaum,Qi Zhong
Inspired from seaweed swayed by waves, the enhanced hydrogen evolution is realized in porous and hybrid g-C 3 N 4 /Pt-PVDF electrospun membranes via piezoelectricity from water flow energy. The membranes are fabricated by dispersing g-C 3 N 4 /Pt into the mixed solution of PVDF and PEO, followed by electrospinning and selective removal of PEO. By changing the PEO amount, the pore size in nanofibers is adjusted. Due to the hydrogen bonding between g-C 3 N 4 /Pt and PVDF, the β phase of PVDF is increased, beneficial for the piezoelectricity performance. When the electrospun membranes are exposed to water flow, an additional potential field is triggered due to the deformation of PVDF. It not only eases the photogeneration of charge carriers from g-C 3 N 4 /Pt but also hinders their recombination. The prolonged lifetime significantly improves the photocatalytic water splitting of g-C 3 N 4 /Pt under visible light. The hydrogen evolution in the electrospun membranes (PVDF to PEO = 4:1) is profoundly improved to 9 278 µmol h −1 g −1 , almost doubled to the pure g-C 3 N 4 /Pt nanosheets (5 220 µmol h −1 g −1 ). Therefore, the seaweed-inspired electrospun membrane is a promising strategy for the efficiently photocatalytic water splitting via g-C 3 N 4 in an aqueous environment, such as a natural sea and lake, by the piezoelectricity gained from the water flow energy.
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