JOURNAL OF ELECTRONIC MATERIALS
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2024
·Vol. 54
·期 1
·598-608
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IF 2.2
Deng Wenqiang,Liao Runhua,Liang Boyu,Du Jie,Zhang Wenbin,Fu Xin,Li Shuyao,Hong Yan,Fu Lichun
In this research, a BiOI/C 3 N 5 heterostructure was synthesized using a solvothermal technique to prevent the recombination of photoexcited electrons and holes. The morphology, structure, and mechanism of the material were investigated using x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), x-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), energy-dispersive x-ray spectroscopy (EDS), electron paramagnetic resonance (EPR), and photoluminescence (PL) spectroscopy, among other tests. The photocatalytic performance of the heterostructure was evaluated through the degradation of tetracycline hydrochloride (TCH). Results showed that compared to C 3 N 5 and BiOI alone, the formation of the heterostructure significantly enhanced the photocatalytic efficiency, achieving 1.5 times the degradation efficiency of pure C 3 N 5 and twice that of BiOI. Under optimal conditions, the composite material degraded nearly 90% of TCH within 180 min, and after five cycles, it still exhibited degradation efficiency of 76.19%, demonstrating its good recyclability and stability. The main active species involved in the photocatalytic degradation of TCH were found to be superoxide radicals (•O 2 − ) and holes (h + ). This work not only provides a new approach to the design of photocatalytic degradation materials but also offers a novel method for effectively degrading organic pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Minjie Zhou,Xianglin Deng,Na Zhang,Bing Chen,Gangyong Li,Haihua Yang
Active site implantation and morphology manipulation are efficient protocols for boosting the electrochemical performance of carbon nitrides . As a promising sulfur host for lithium–sulfur batteries (LSBs), in this study, C 3 N 5 porous nanostructure incorporated with both boron (B) atoms and nitrogen (N) defects was constructed (denoted as ND–B–C 3 N 5 ) using a two-step strategy, i.e., pyrolysis of the mixture of 3-amino-1,2, 4-triazole and boric acid to obtain B-doped C 3 N 5 porous nanostructure and then KOH etching under hydrothermal condition to generate N defects. The doped B atoms in the C 3 N 5 porous nanostructure are in the form of B–N bonds and grafted B–O bonds. N defects are primarily created at the C N–C positions of the triazine unit, leaving behind some N vacancies and cyano groups . Benefiting from the involvement of B dopants and N defects, the optimized ND–B–C 3 N 5 –12 sample exhibits ameliorative conductivity, mass transport, lithium polysulfides (LiPSs) adsorption ability, diffusion of Li + ions, Li 2 S deposition capacity, sulfur redox polarization, and a reversible solid–solid sulfur redox process . Consequently, the ND–B–C 3 N 5 –12/S cathode delivers accelerated redox performance of polysulfides for LSBs, revealing capacities of 1091 ± 44 and 753 ± 20 mAh/g at 0.2C for the initial and 300th cycles, respectively. The ND–B–C 3 N 5 –12/S cathode is also endowed with desired sulfur redox activity and stability at 2C for 1000 cycles, holding an initial discharging capacity of 788 ± 24 mAh/g and a low decay rate of 0.05 % per cycle.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
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IF 4.3
Jingle Zhang,Huihu Wang,Yangliu Ou,Hao Tu,Ziguan Zhang,Chenhuinan Wei,Xing Xiang,Ming Bao
As the overuse of antibiotics increasingly contaminates the environment, one of modern chemistry's objectives is to identify high-performance photocatalytic materials to degrade antibiotics. This study initially utilized NH 4 Cl as a gas template to synthesize porous lamellar g-C 3 N 4 (CNS) through a high-temperature calcination process. Building upon this, a homojunction catalyst, CNS/g-C 3 N 5 (S-CN), was developed via a secondary sintering technique using different amount of 3-amino-1,2,4-triazole addition to evaluate its efficacy in activating peroxymonosulfate (PMS) for degrading the antibiotic ceftriaxone sodium. Under neutral conditions, the photocatalytic system composed of S-CN catalysts prepared by 50 mg of 3-amino-1,2,4-triazole addition and PMS (S 3 -CN/PMS) exhibited degradation rates that were 3.37 and 8.11 times higher than those of the CNS/PMS and g-C 3 N 5 /PMS, respectively. At a pH of 8, the S 3 -CN/PMS system attained a 99.7 % degradation efficiency within 75 min. Based on results from UV–visible diffuse reflectance spectroscopy (DRS), transient photocurrent response, electrochemical impedance spectroscopy (EIS), photoluminescence spectroscopy and radical scavenging experiments, this high efficiency is attributed to a homojunction Z-type charge transfer mechanism that enhances the separation of photogenerated carriers. Furthermore, the study found that the optimal PMS addition was 20 mg and the optimal pH was 8. Chloride ions promoted the reaction, while other ions decreased the reaction rate. In conclusion, this paper provides valuable insights for the morphological modification of carbon nitride homojunction materials and the efficient activation of PMS for pollutant degradation.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Huixiang Yan,Wei Li,Huixing Yang,Yongzhuo Yu,Chaoyu Lv,Linlin Hou,Wenxu Zhang,Di Lin,Shichao Jiao
A novel ternary photocatalyst Ni 3 S 4 @ZIS@C 3 N 5 with type II and Z-type heterojunctions was synthesized for the first time by hydrothermal and electrostatic self-assembly methods, effectively avoiding the thermal decomposition of C 3 N 5 during the synthesis of the complex. The best ternary catalyst Ni 3 S 4 @ZIS@C 3 N 5 is capable of achieving an optimal hydrogen evolution rate of 9750 mmol g −1 h −1 , which is approximately 10.89 times as high as that of C 3 N 5 , indicating that the complex effectively enhanced the photocatalytic properties of the monomer . The coexistence of two types of heterojunctions in the complex effectively enhances photocatalytic performance, in which the monomer ZIS constructs type II scheme with Ni 3 S 4 and Z-type scheme with C 3 N 5 , respectively. The two heterojunctions complement each other and jointly promote the rapid electron transfer from Ni 3 S 4 and C 3 N 5 to the ZIS surface. In conclusion, the cooperation of the two heterojunctions efficiently facilitates the migration of photogenerated carriers, thus enhancing the photocatalytic hydrogen generation performance of Ni 3 S 4 @ZIS@C 3 N 5 .
研究领域:
材料科学
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化学工程
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能源科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2024
·Vol. 13
·期 1
·295-305
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IF 5.7
Yanan Gao,Jingjing Wang,Jingxuan Yang,Yajie Wang,Wenjuan Tian,Bin Liu
Nitrogen-rich graphitic carbon nitride (g-C3N5) has garnered significant attention in photocatalytic hydrogen production due to its unique physicochemical properties. However, g-C3N5 faces persistent challenges stemming from rapid carrier recombination. In this study, we successfully synthesized a Pd/C3N5-K,I photocatalyst through sequential doping of non-metallic heteroatoms and metal nanoparticles. The Pd/C3N5-K,I photocatalyst demonstrates a remarkable enhancement in the photocatalytic H2 evolution rate (2.9 mmol g−1 h−1), approximately 14 times higher than that of pure g-C3N5 (0.2 mmol g−1 h−1). Characterization and calculation analyses reveal that iodine doping into the g-C3N5 skeleton leads to the formation of planar C–I bonds, facilitating C3N5 layer electron–hole pair separation. The subsequent insertion of Pd nanoparticles between the layers leads to electron accumulation on C3N5-K,I, while resulting in hole concentration on Pd nanoparticles, thereby facilitating thorough spatial separation of electron–hole pairs. The strategic co-doping of iodine and palladium nanoparticles effectively restrains carrier recombination of g-C3N5 by connecting intra- and inter-layer interactions. This study constitutes a novel conceptual framework for CN-based photocatalysts, offering a promising approach to improve their performance in hydrogen production applications.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2023
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IF 6.9
Fangting Liu,Qiaoyu Zhang,Chengcheng Chen,Zhengguo Zhang,Xiaoming Fang
The key to construct an efficient direct Z-scheme heterojunction lies in the selection of two semiconductors with matching Fermi energy levels, visible light response capability and the elaborately designed interface. Herein, a research method that theoretical calculation first and then experimental study was employed to develop an efficient direct Z-scheme V 2 O 5 /C 3 N 5 photocatalyst for hydrogen production . First, the theoretical calculations on the V 2 O 5 (110)/C 3 N 5 (001) heterojunction suggested the large interface binding energy between these two components, their visible-light absorption properties and matching Fermi energy levels, and the charge difference density of V 2 O 5 /C 3 N 5 allowing the migration path of photogenerated carriers in composite structure, which satisfies the requirements for constructing a direct Z-scheme. Then, the V 2 O 5 /C 3 N 5 heterojunction was experimentally constructed by calcining the mixture of 3-amino-1,2,4-triazole and ammonium metavanadate , which Z-scheme charge transfer path was further verified by free radical trapping and in situ irradiated XPS analyses. We also found that N–O bonding was formed between C 3 N 5 and V 2 O 5 , which could provide a favorable interface for facilitating the charge transfer within the heterojunction. The optimal V 2 O 5 /C 3 N 5 -3.7 heterojunction exhibited a H 2 yield of 329.9 μmol/h under the visible light irradiation , 19.8 times that of single C 3 N 5 , and showed an apparent quantum efficiency of 7.21% at 420 nm. The high charge separation of the V 2 O 5 /C 3 N 5 heterojunction is revealed to be mainly responsible for the enhancement in its photocatalytic activity . This work sheds light on the research method that consists of theoretical design first and then experimental study for constructing high-efficiency direct Z-scheme heterojunctions.
研究领域:
材料科学
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理论计算与实验研究
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高影响因子
Catalysts
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2025
·Vol. 15
·期 1
·94
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IF 4
Fuhai Zhang,Jing Xiong,Xiaoxiao Yu,Lei Wang,Tongyu Wu,Zhendong Yu,Minmeng Tang,Haiyan Liu,Yanhong Chao,Wenshuai Zhu
As a promising member of the carbon nitride family, nitrogen-rich g-C3N5has attracted significant attention because of its excellent light absorption performance. Nevertheless, its practical application in photocatalytic CO2reduction is hindered by severe photogenerated charge recombination and limited CO2adsorption capacity. Constructing a heterojunction has emerged as an effective strategy to mitigate charge recombination, thereby enhancing the photocatalytic performance of the catalyst. Herein, a series of CdS/g-C3N5-X heterojunction catalysts were prepared via an in situ hydrothermal approach. The obtained heterojunction catalysts exhibited a novel coral reef-like morphology which facilitated the exposure of additional active sites, thereby enhancing the adsorption and activation of CO2. Moreover, studies have shown that CdS can be anchored to the surface of g-C3N5through C-S bonds, forming a built-in electric field at the interface, which accelerated the separation and transfer of photogenerated charges. Consequently, the resulting heterojunction materials demonstrated high efficiency in photocatalytic CO2reduction with H2O as a sacrificial agent. In particular, CdS/g-C3N5-0.2 exhibited the maximum photocatalytic performance up to 22.9 μmol·g−1·h−1, which was 6 times and 3 times that of unmodified g-C3N5and CdS, respectively. The results indicated that the increased active sites and enhanced charge separation of the Cd/g-C3N5-0.2 catalyst were the primary reasons for its improved photocatalytic CO2reduction performance. This work provides a novel heterojunction-based photocatalyst for efficient CO2photocatalytic reduction, offering insights into the preparation of high-performance photocatalysts for sustainable energy applications.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yanrong Li,Yusong Wen,Mengya Cao,Yijia Cao,Qing Shen,Bao Li,Wen Gu
This study presents the synthesis and characterization of palladium tetranapthalene porphyrin/C 3 N 5 -x [(Np) 4 PdP/CN-x, x is the mass ratio] heterojunctions fabricated by a wet grinding technology. The key focus is to effectively separate the electron-hole (e − -h + ) produced by C 3 N 5 after illumination to improve its photocatalytic activity. By incorporating palladium tetranapthalene porphyrin [(Np) 4 PdP] as photosensitizer, a Z-scheme charge carriers migration mechanism is introduced to facilitate the separation of photogenerated carriers. Through optimization, the photocatalytic performance of (Np) 4 PdP/CN-x nanocomposites were evaluated, revealing that (Np) 4 PdP/CN-1 exhibits the most superior activity, achieving an impressive 98.73 % and 99.87 % degradation efficiency of 20 ppm methylene blue (MB) and rhodamine B (RhB) under a 300 W xenon lamp within 13 min. We also studied the photocatalytic antibacterial properties of (Np) 4 PdP/CN-1, and the inhibition rates of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) reached 96.41 % and 98.14 % within 10 min. Free radical capture tests and electron paramagnetic resonance measurements indicated that ·O 2 – and ·OH were the primary active substances during photodegradation. On the basis of that, a feasible photodegradation mechanism of direct Z-scheme heterojunction was proposed. This study provides a possibility for designing C 3 N 5 based materials modified with metal porphyrins for photocatalytic dye degradation and antibacterial.
研究领域:
材料科学
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环境科学
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生物学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Hui Bai,Runwen Xiong,Nan Wang,Mingxia Tian,Jianbo Zhao,Fengqin Tang,Jianhui Jiang
Environmental pollution, particularly from organic dye-laden wastewater, represents an escalating global challenge, necessitating the development of efficient and sustainable remediation strategies. Herein, we report the fabrication of a rare-earth element Yb-doped TiO 2 /g-C 3 N 5 (YTCN) heterostructured photocatalyst through hydrothermal synthesis and calcination, utilizing methylene blue (MB) and rhodamine B (RhB) as representative contaminants. The YTCN composite with an optimized mass ratio of 1:3 exhibited superior photocatalytic degradation efficiencies of 96.57 % for MB and 91.82 % for RhB with a decline rate of 0.02083 and 0.01832 min −1 under 500 W xenon lamp irradiation within 105 min, corresponding to 2.2-fold and 2.1-fold improvements over pristine TiO 2 , respectively. The Construction of YTCN significantly enhances photocatalytic efficiency by enhancing the separation of charge carriers, extending light absorption into the visible region, and improving overall catalytic activity. This performance enhancement is ascribed to the cooperative interactions among Yb, TiO 2 , and CN, which raise charge generation, division, and carriage dynamics of photoinduced electrons (e − ) and holes (h + ). Furthermore, the YTCN composite demonstrated excellent recyclability and structural stability, remained close to 90 % degradation efficiency after five consecutive cycles without notable crystal degradation. These results highlight the potential of YTCN heterostructures as low-cost and robust photocatalysts for advanced wastewater treatment applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Sile Liu,Yifu Bu,Song Cheng,Rongrong Tao
TiO 2 /g-C 3 N 5 heterojunction is synthesized by the simple method, which is used in photocatalytic degradation methylene blue (MB) under visible light irradiation. The characterization analysis indicates that TiO 2 /g-C 3 N 5 has good crystallinity , and the heterojunction between TiO 2 and g-C 3 N 5 is formed with good MB photocatalytic degradation performance . The MB photocatalytic degradation removal of the TiO 2 /g-C 3 N 5 is 97.4 % at the concentration of 20 mg/L, which is significantly improved compared to the TiO 2 and g-C 3 N 5 . The visible light adsorption ability and the separation of photogenerated carriers of the TiO 2 /g-C 3 N 5 are improved, which is beneficial to the MB photocatalytic degradation. TiO 2 /g-C 3 N 5 has good reusability with 95.8 % of the initial removal after 5 cycles. The capture experiment and electron paramagnetic resonance spectroscopy analysis indicate that the existence of the h + , O 2 − and OH involves in MB photocatalytic degradation process . MB photocatalytic mechanism of the TiO 2 /g-C 3 N 5 is consistent with the direct Z scheme mechanism based on the band gap structure calculations.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Zhengqing Cai,Yining Huang,Haodong Ji,Wen Liu,Jie Fu,Xianbo Sun
A novel g-C 3 N 5 /Bi 4 O 5 Br 2 surface heterojunction was developed via in-situ growth of Bi-rich Bi 4 O 5 Br 2 on g-C 3 N 5 nanosheets. The optimal composite achieved 3.6- and 16.0- times of sulfathiazole (STZ) degradation activity when compared with pristine Bi 4 O 5 Br 2 and g-C 3 N 5 . The interlayer stacking morphology and extra nitrogen in triazine units significantly narrowed the conduction band of g-C 3 N 5 , which greatly promoted its visible utilization; while the bismuth-rich property of Bi 4 O 5 Br 2 prolonged the excited charge carrier lifetime. Both photoluminescence and electrochemical impedance spectroscopy analysis demonstrated that the type-II surface heterojunction (g-C 3 N 5 /Bi 4 O 5 Br 2 ) offered remarkable charge transfer and separation due to the matched energy band structure. The STZ degradation mechanism and pathways were proposed based on experiments and density functional theory calculation, and the contribution of reactive species for STZ degradation followed the order of O 2 ∙ - > h + > OH. Moreover, the toxicity evolution of STZ was evaluated, suggesting that sufficient mineralization is required to ensure safe discharge. The Box-Behnken experimental design methodology study revealed that g-C 3 N 5 /Bi 4 O 5 Br 2 exhibited high reactivity for antibiotics degradation under different water matrix. This study suggested that g-C 3 N 5 /Bi 4 O 5 Br 2 has great application potential for cost-effective remediation of persistent organic contaminants by using solar light.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Wubin Wang,Jin Wang,Yufei Yan,Kaili Huo,Chao Han,Qingyun Zhang
The positively charged nanofiltration (NF) membrane prepared via interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC) has drawn considerable attention for lithium-magnesium separation, particularly crucial for lithium recovery from salt lakes with high Mg 2+ /Li + mass ratios. However, NF membranes prepared solely from amine monomers have not achieved efficient Li + and Mg 2+ separation. In this study, PEI-g-C 3 N 5 /TMC composite NF membranes were successfully fabricated by mixing amino-rich graphitic carbon nitride (g-C 3 N 5 ) with PEI, followed by the IP reaction of the mixed solution with TMC. Molecular dynamics (MD) simulation results showed that g-C 3 N 5 had an attractive effect on PEI, which led to a decrease in the diffusion rate of PEI, thereby resulting in a thinner separation layer. Density functional theory (DFT) revealed that g-C 3 N 5 competed with PEI, leading to a reduction in the crosslinking within the polyamide (PA) layer and subsequently causing an increase in the surface pore size of the membrane. Besides, the hydrophilicity and positive charge of the modified membrane were both improved. MD simulations, transition state theory, and DLVO principles indicated that the modification of the PA layer by g-C 3 N 5 enhanced the repulsion of Mg 2+ and the transport of Li + during the NF process. This breakthrough effectively overcame the trade-off effect between membrane separation and permeability, especially at a g-C 3 N 5 content of 0.06 wt%, where the lithium-magnesium selectivity coefficient ( S Li, Mg = 18.18) and pure water flux (Flux = 58.59 L m −2 h −1 ) reached the optimum values. Meanwhile, the PEI-g-C 3 N 5 /TMC membrane demonstrated stable separation performance during prolonged filtration and in solutions with varying Mg 2+ /Li + mass ratios. This study not only provides an effective strategy for the design of NF membranes but also expands the application prospects of nanomaterials in the field of membrane separation.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
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