JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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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
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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
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
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
·
2024
·
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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Nanoscale
·
2024
·
IF 5.8
Dong Wang,Zhiwei Zhang,Xuetao Yan,Tianliang Li,Yingying Chen,Zhenzhen Li,Lingyan Feng
Circularly polarized luminescence (CPL) is a fascinating luminescence phenomenon that has garnered significant research attention for chiroptical applications. In this study, we developed a highly sensitive chiroptical sensor by co-assembling G-quartet nanofibers and nonchiral nitrogen sulfur-doped carbon dots (N–S-CDs) for dual ion detection. The N–S-CDs were synthesized using the one-step microwave method, and a helical G-quartet-based nanofiber structure (g-fiber) was simultaneously formed from guanosine 5′-monophosphate (GMP) in the presence of Sr2+. An adjustable helical G-quartet-based nanofiber provided an optimal chiral environment for CPL emission, with a dissymmetry factor (glum) reaching ±0.02. Notably, the left-handed (L-) and right-handed (R-) helical chirality of the complex was determined by switching between kinetic trap states and thermodynamic equilibrium during the reaction process. An optimized CPL sensor was developed based on chiral CDs/g-fiber composite materials, utilizing sensitive CPL as the signal output of dual detection for Hg2+ and I−. Similar limits of detection (LODs) were achieved for both L-/R-nanocomposites, with the best results being 83.5 nM for Hg2+ and 142.8 nM for I−. These values are comparable with or even better than those obtained with other optical analytical methods. Since CPL biosensors are relatively rare to date, our work presents a new horizon for the application of chiral CPL composites in biological assays.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
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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
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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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Environmental Science-Nano
·
2025
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IF 5.1
Qi Xu,Xu Du,Qin Zhou,Lian Yang,Kuixiao Li,Wei Wang,Gang Wang,Guisheng Xu,Feng Xiao
Photocatalytic oxidation technology is recognized as an effective method for removing antibiotics from wastewater. In this work, a novel montmorillonite/graphitic carbon nitride (Mt/g-C3N4) composite was synthesized via a facile thermal polycondensation approach. The optimal 1% Mt/g-C3N4 photocatalyst demonstrated an excellent chlortetracycline (CTC) degradation rate of 0.0353 min-1 under visible light, which is about 42% higher than pristine g-C3N4. Electron spin resonance (ESR) and radical quenching experiments revealed that the •O2- plays the most significant role in the photocatalytic oxidation of CTC, while •OH, 1O2 and h+ also contribute, but not in dominant places. This study elucidates the mechanism by which the photocatalytic activity is enhanced. The improvements are ascribed to the extended absorption of visible light, efficient charge separation, and the inhibition of photo-induced electron-hole pair recombination, following the successful intercalation of g-C3N4 nanosheets into montmorillonite layers. Additionally, HPLC-QTOF-MS was employed to identify the transformation products of CTC, and the primary degradation pathways were elucidated. Furthermore, the ecotoxicity of the transformation products was evaluated using ECOSAR software.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Fei Gao,Weijun Chen,Ye Li,Long Shao,Li He
Organic-inorganic hybrid perovskite films with excellent surface morphology and large grain sizes are crucial for achieving high-performance perovskite solar cells (PSCs). To reduce production costs and meet the growing demand for lightweight thin solar cells, developing ultra-thin absorber layers is an effective approach. However, defects and trap sites are inevitably formed on the surfaces of solution-processed perovskite films. Herein, we present an innovative method that directly incorporates graphite carbon nitride/carbon quantum dots (g-C 3 N 4 /CQDs) into the perovskite precursor solution, using them as structural template to modulate film growth. The g-C 3 N 4 /CQDs delay crystallization through the formation of a MA·g-C 3 N 4 /CQDs intermediate adduct, which reduces light absorption loss by increasing enlarge grain size and minimizing numerous pinhole defects in thin perovskite films. Additionally, the amide bond formed between g-C 3 N 4 and CQDs can accelerate charge transport, as demonstrated by density functional theory calculation. As a result, the PSCs based on high-quality 360 nm MAPbI 3 :g-C 3 N 4 /CQDs films achieved a champion power conversion efficiency of 20.49 %. The devices retained more than 90 % of their initial efficiency for over 500 h in air without encapsulation. This work not only provides valuable insights into the role of 2D/0D carbon-based heterojunctions in PSCs, but also provides a straightforward technique for crystallization regulation to achieve efficient and stable PSCs.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 36
·15782-15789
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IF 2.7
Hongling Tao,Yanyue Chen,Jiawen Liu,Jiali Liu,Yunhui Yang,Rong Hu
p53 gene is one of the most important anticancer genes and has been recognized as a typical biomarker for the early diagnosis of cancers. In this paper, a portable point-of-care testing (POCT) platform was developed for the colorimetric and photothermal dual-modal analysis of the p53 gene. Long concatemer G4 structures with high catalytic activity were formed by a target-driven hybridization chain reaction, and their catalytic properties can further be enhanced with the help of iodide ions. This dual-modal method realized the sensitive multicolor visual point-of-care detection of the p53 gene, where color variations from colourless to blue were easily distinguished by the naked eye. The temperature output was achieved by effective photothermal conversion and regulation guided by the accumulated concatemer G4 complexes in the TMB–H2O2 system, avoiding the need for complex instruments. The proposed dual-modal assay for p53 gene detection is cost-effective, simple, highly sensitive (3.34 pM), stable, and remarkably selective. It was also applied to determine the concentration of the p53 gene in spiked serum samples.
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Journal of Water Process Engineering
·
2024
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IF 6.3
Yali Song,Ziyan Li,Shuaibin Li,Cairong Yang,Long Huang,Xiaojing Zhang,Qiong Wang,Hongzhong Zhang
Holes and O 2 − have been proved the primary species for sulfamethoxazole (SMX) degradation in g-C 3 N 4 photocatalytic system. On the basis, P doped g-C 3 N 4 (PCN) photocatalyst with midgap states was prepared by the polymerization of urea and etidronic acid, in order to enhance the role of main species in SMX removal via tailoring band gap structure. Compared with g-C 3 N 4 , the energy gap, CB position and VB position of PCN change little, however, PCN shows lower recombination efficiency of photogenerated carriers, strong adsorption and harvest of more visible light due to the midgap states induced by P doping, which is favorable to improve the photocatalytic activity. When the additive amount of etidronic acid is 0.03 g for 10 g urea, the obtained PCN-0.03 exhibits excellent visible-driven photocatalytic ability on SMX degradation. The kinetic constant is 2.1 times than that of pure g-C 3 N 4 . Electron spin resonance tests and trapping experiments imply that OH, holes and O 2 − are produced and enhanced by PCN-0.03 under visible light in comparison with g-C 3 N 4 . Holes and O 2 − take the primary role in SMX photodegradation . The detailed and systematical work may provide an effective strategy for water purification , especially containing SMX.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Tian Tian,Dingze Lu,Bang Zhao,Kiran Kumar Kondamareddy,Wenju Gu,Jingxuan Yang,Hongjuan Hao,Huiqing Fan,Wingkei Ho
It is crucial to elucidate the intrinsic relationship between defects in g-C 3 N 4 (pristine graphitic carbon nitride, here onwards bare carbon nitride-BCN) and the enhancement of photogenerated carrier dynamics and photocatalytic performance. Three types of defective g-C 3 N 4 are prepared by defect engineering, called CVCN (carbon vacancies containing carbon nitride), NVCN (nitrogen vacancies containing carbon nitride), and OBCN (oxygen doped bulk carbon nitride). Various characterization techniques are employed to examine the materials' crystalline structure, chemical bonds, surface area, pore properties, light response, carrier recombination, vacancy/doping types, and carrier mobility. Ab initio calculations via VASP further elucidated band structure and charge distribution. Visible light-assisted Rhodamine B (RhB) degradation and hydrogen peroxide production experiments revealed that defect engineering significantly enhanced the photocatalytic degradation capacity of g-C 3 N 4 , with OBCN showing the highest RhB degradation rate which is 6.26 times higher than that of BCN (bulk carbon nitride), but suffering from photo-corrosion and its main reactive substances are h + and ·O 2 - ; while NVCN exhibited the best hydrogen peroxide production capacity which is 1.83 times higher than that of BCN, the main active species is ·O 2 - . Through the Vienna Ab initio Simulation Package software (VASP), the projection enhanced wave method is used to model and analyze the first principles calculation of the band structure of the samples and the change of elemental differential charge. The occurrence of defects slightly modulated the energy band structure of the photocatalyst, significantly inhibited the recombination phenomenon of photogenerated carriers, promoted the separation of photogenerated carriers, and ultimately improved the photocatalytic activity.
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