ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Rui Han,Yuwei Yao,Tadayuki Fujii,Yasushi Iseri,Xiaobiao Zhu
The heterogeneous photo-Fenton catalyst has attracted much interest in wastewater remediation applications. Herein, a heterostructure (CN-Vn/FIS) between ternary chalcogenide compound (FIS) and graphitic carbon nitride with nitrogen vacancies (CN-Vn) was synthesized via hydrothermal reaction to in-situ generate H 2 O 2 under visible light and degrade tetracycline (TC) in water. CN-Vn/FIS could achieve as high as 98.5 % TC removal efficiency which maintained at 82.3 % in the fifth recycle, and was effective in the pH range of 2.6–9.0. The optical experiment suggested that CN-Vn/FIS demonstrates a broader light absorption edge as well as a low electron transfer energy barrier. Additionally, free radical trapping and EPR experiments proved that singlet oxygen ( 1 O 2 ) played a prominent role in the photo-Fenton process, while competitive reaction kinetic analysis calculated 1 O 2 contributed to 89.7 % TC degradation in CN-Vn/FIS system, which is nearly 3 times higher than 31.5 % in CN system. The results showed that CN-Vn/FIS created a one-step pathway to generate H 2 O 2 without the aid of the intermediate free radical •O 2 − . This study illustrated an efficient and green TC degradation alternative through photo-Fenton process catalyzed by CN-Vn/FIS under visible light.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Wei Zhang,Min Chen,Xinjian Cheng,Jie Yang,Jumei Li
In this study, we demonstrated an efficient solar photocatalyst, g-C 3 N 4 modified hollow Ag/ZrO 2 core–shell composites (Ag/hZrO 2 /CN) using polymethylacrylic acid (PMAA) nanospheres as sacrificial template. The optimized Ag/hZrO 2 /CN catalyst demonstrated substantial photocatalytic performance, achieving 97.6 % degradation of methylene blue (MB) and 99.5 % degradation of thiram (TRM) within 90 min under simulated sunlight using a 500 W Xe lamp. The improved property is likely attributed to the synergistic effect among three constituents and the effective segregation of photogenerated electron-hole pairs in ZrO 2 , g-C 3 N 4 and Ag NPs, as confirmed by photocurrent and EIS analysis. Based on free radical scavenging studies (e − , h + , OH and O 2 − ), the mechanism underlying the boosted photocatalytic activity was suggested. Moreover, Ag/hZrO 2 /CN presented excellent surface enhanced Raman scattering activity, achieving quantitative sensing of MB and TRM with limits of detection of 5 × 10 −8 and 10 −6 mol/L, respectively, and a favorable linear correlation between SERS intensities and logarithmic concentration (R 2 ≥ 0.97). Additionally, Ag/hZrO 2 /CN accomplished recyclable SERS detection of MB and TRM through stimulated sunlight irradiation, which is significant for the recyclable SERS detecting through fast sunlight-powered procedure.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Qin Zhang,Jiancong Liu,Dongxu Wang,Chengxu Jin,Li Fang,Xingyu Li,Yingjie Jiang,Xin Wang,Chungui Tian
The construction of strong metal-support interaction (SMSI) between ultrasmall metal nanoparticles and semiconductor supports remains a pivotal challenge in developing high-performance photocatalysts for selective CO2 conversion. Herein, we propose a coordination-induced in-situ confinement strategy that synchronously achieves high dispersion of small-sized Ag nanoparticles (Ag NPs) and SMSI with ultrathin C3N4. Through melamine-mediated Ag-N coordination bonds, this approach orchestrates three synergistic effects: (1) Coordination-induced confinement of Ag NPs (~3.3 nm) via covalent Ag-N linkages, yielding an increase in active site density and stability compared to conventional Ag/C3N4; (2) Enhanced electron transfer from C3N4 to Ag, extending carrier lifetimes and suppressing charge recombination; (3) Interfacial electronic redistribution that promotes the generation of *COOH intermediates, steering the reaction pathway toward CO with high selectivity. Furthermore, the coordination-induced thermal condensation induces nitrogen vacancies in C3N4, which act as molecular traps to enhance CO2 adsorption capacity and synergize with Ag sites for efficient CO2 activation. As a result, the optimized catalyst exhibits a remarkable CO yield of 70.63 μmol·g-1·h-1 without the use of sacrificial agents, along with high selectivity (> 98 %) and excellent stability. This work establishes a universal paradigm for engineering metal-semiconductor interfaces through coordination chemistry, offering transformative insights into solar-driven CO2-to-fuel conversion technologies.
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Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·2995-3004
·
IF 10.733
Peng Wen,Kefei Zhao,Hui Li,Jiangsheng Li,Jing Li,Qing Ma,Scott M. Geyer,Lin Jiang,Yejun Qiu
Very recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts for decorating graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on the g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present a facile and convenient route to in situ incorporate g-C3N4 nanosheets (NSs) and Ni2P nanocrystal (NC) co-catalysts via a one-step co-heating solution approach. The Ni2P/g-C3N4 (in situ) hybrid photocatalyst achieved a far superior H2 production rate (2849.5 μmol g−1 h−1) and durability (no decrease after 4 cycles of reaction within 20 h) compared to the Ni2P/g-C3N4 (self-assembly) sample. The apparent quantum yield (AQY) of 18.8% at 420 nm was also much higher than that of other TMP co-catalyst loaded g-C3N4 hybrid photocatalysts. A possible Ni(δ+)–N(δ−) chemical coupling in the Ni2P/g-C3N4 (in situ) hybrid composite was proposed and corroborated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy. The unique Ni(δ+)–N(δ−) chemical bonding states between g-C3N4 and Ni2P significantly accelerate the photo-generated charge-carrier separation and extraction from g-C3N4, as well as maintaining the H2 production durability. We believe that the hybridization route presented in this work will be extended to construct other TMP integrated photocatalysts toward efficient and stable solar water splitting.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 12
·7469-7479
·
IF 1.134
Ji Dongliang,Zhang Meixing,Geng Xinxiang,Zha Zhenxing,Li Ying,Yang Jing,Cui Shihai
The graphitic carbon nitride (g-C3N4) and the Fe3O4/g-C3N4 magnetic materials were synthesized in this paper. The structures of the materials were confirmed by a series of analysis. The Fe3O4/g-C3N4
was then used as a sorbent to adsorb polychlorinated diphenyl ethers and polychlorinated biphenyls. Different extraction conditions were examined, including adsorbent amount, salinity, pH of the sample matrix, adsorption time, reaction temperature, elution solvent and preconcentration factor.
The maximum recoveries were obtained by employing methanol to desorb pollutants on 40.0 mg Fe3O4/g-C3N4 in 120.0 mL environmental water with a salinity of 5% (w/v) at a pH of 7 at 25 °C within 10 min. Using the optimized parameters, the detection
limits of the method are between 0.01 and 0.04 μ · L−1 with a satisfying linear relationship. The adsorbent can be recycled at least 10 times with no significant reduction in the extraction efficiency.
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RSC Advances
·
2021
·Vol. 11
·期 52
·32671-32679
·
IF 3.361
Hailian Bao,Xiaodi Chen,Rui Yuan,Chao Zhang,Shiai Xu
A surface heterojunction catalyst of g-C3N4–PEDOT/P3HT with P3HT and PEDOT as the polymer sensitizer and hole transport pathway is successfully prepared. The as constructed g-C3N4–PEDOT/P3HT composite exhibits a photocatalyst H2 evolution rate up to 427703.3 μmol h−1 g−1 which is 1059 times higher than that of g-C3N4, 118 times higher than that of g-C3N4–PEDOT with ascorbic acid as sacrificial reagents. What's more, the g-C3N4–PEDOT/P3HT can even show an obviously enhanced photocatalytic H2 evolution rate which is 6.1 times higher than that of pure g-C3N4 in pure water without any sacrificial reagent. Combining the experimental results and molecular dynamic (MD) simulation results, a possible mechanism can be drawn that the existed PEDOT possesses relatively higher hole mobility and can be used as a hole conductor between g-C3N4 and P3HT. Then, the photogenerated holes migration can be accelerated by PEDOT from the VB of g-C3N4 to the VB of P3HT. All those factors may benefit the synergy among g-C3N4, PEDOT and P3HT, which finally facilitates the rapid migration of photoinduced electron–hole pairs and eventually improves the photocatalytic H2 activity process of g-C3N4–PEDOT/P3HT with visible light. The present work may provide useful insights for designing a surface heterojunction composite photocatalyst with high photocatalytic activity for H2 production.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yixiao Wu,Xuesong Zhao,Shaobin Huang,Yihao Li,Xiaoqian Zhang,Gongchang Zeng,Lishan Niu,Yu Ling,Yongqing Zhang
Photocatalytic oxidation using solar energy is a promising green technology to degrade antibiotic contaminants. Herein, a 2D g-C 3 N 4 supported nanoflower-like NaBiO 3 with direct Z-scheme heterojunction was synthesized via a facile hydrothermal approach, and the photocatalytic performance of g-C 3 N 4 /NaBiO 3 was remarkable better than that of g-C 3 N 4 and NaBiO 3 for tetracycline degradation under visible light. Photoinduced electrons accumulated on the conduction band of g-C 3 N 4 and holes gathered on the valence band of NaBiO 3 , which was more suitable for generating superoxide and hydroxyl radicals . Meanwhile, the built-in electric field between g-C 3 N 4 and NaBiO 3 was proved by their different work functions based on DFT calculations , which enhanced the charges separation. The formed radicals were determined by ESR, and their role in the degradation of tetracycline was examined by the active species trapping test. Moreover, the sites attacked by free radicals and degradation pathways for tetracycline were inferred by the results of Gaussian 09 program and HPLC-MS. The effects of water matrix and three other organic contaminants was further studied for actual use evaluation. Importantly, the prepared g-C 3 N 4 /NaBiO 3 showed stable photodegradation activity for eight cycles. This work not only provides a promising photocatalyst, but also gets insight into the photocatalytic removal of tetracycline.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 16
·13271-13289
·
IF 2.779
Yu Xiaochen,Song Zeyu,Dong Xiaoqian,Li Huajian,Liu Haonan,Zhao Baoyan,Ye Ting,Jiang Yinlin,Li Xiaojie,Duan Li,Fan Jibin,Zhao Peng
g-C 3 N 4 and rare earth (RE)-doped (Yb, Nd and Ce) g-C 3 N 4 nanosheets were synthesized by a thermal method. The remarkable effects of RE doping on the structural, morphological, and optical properties of g-C 3 N 4 were investigated using XRD, FT-IR, SEM, BET, XPS, UV–Vis, PL, EIS and Mott–Schottky characterization techniques. The photocatalytic activities of RE doped g-C 3 N 4 nanosheets for different dyes were improved compared with g-C 3 N 4 under visible light irradiation, among which Ce/g-C 3 N 4 showed outstanding performance. Due to the doping of RE, it modulates the electronic structure of pristine g-C 3 N 4 and broadens its optical absorption range. In addition, a possible mechanism of photocatalytic degradation of dyes was propounded by free radical trapping experiments. This work may provide a reference for the rational design of photocatalysts and inspiration for the photocatalytic mechanism.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Minmin Liu,Baitong Niu,Hongxu Guo,Shaoming Ying,Zhangxu Chen
g-C 3 N 4 @Ni 3 C nano-sheets have been prepared by a simple pyrolysis under different temperature, and the as-prepared samples have been characterized by many means, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), the Brunauer–Emmett–Teller (BET) and pore size distribution. The as-prepared g-C 3 N 4 @Ni 3 C nano-sheet has been proved to be a versatile functional material, that is the application in supercapacitor electrode materials, hydrogen generation via NaBH 4 hydrolysis and reduction of p– nitrophenol. This method offers a new strategy for preparation of environmental energy materials through simple raw materials.
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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 32
·325101
·
IF 2.8
Wenyuan Li,Yuling Chen,Xiaolin Feng,Yanguang Chen,Xuanchun Hu,Caibai Yang,Yong Ye
Photocatalytic degradation is increasingly recognized as a highly effective approach for the removal of organic pollutants and pathogenic microorganisms from wastewater. Nevertheless, conventional unit catalysts often fall short of practical requirements, primarily due to their limited efficiency in photoinduced electron-hole transfer and the scarcity of active sites. In this work, three-dimensional porous material pg-C3N4 was synthesized utilizing the hard template method, employing dendritic mesoporous silica as the templating agent. And the nanoparticles of BiVO4/pg-C3N4 direct Z-heterojunction composite (BCN) were successfully constructed by using pg-C3N4 as growth template and BiVO4 in situ directed growth. The heterogeneous surface morphology of pg-C3N4 markedly enhances its capacity for visible light absorption and increases the availability of catalytic active sites. BCN demonstrates the ability to degrade 98% of Rhodamine B under simulated solar irradiation within 120 min and effectively inactivates 2 × 107 cfu ml−1 of E. coli under similar conditions within 60 min. Notably, after five cycles of use, the structural integrity and functional properties of the material remain largely unaltered. The superior photocatalytic degradation and photodynamic sterilization performance of BCN can be primarily attributed to its narrower band gap width of 2.34 eV, reduced electrochemical impedance, and enhanced separation and transfer rate of photogenerated carriers. Collectively, these properties facilitate the effective degradation of organic pollutants and the robust inactivation of bacteria by BCN under visible light irradiation. The successful implementation of this research offers a theoretical foundation and experimental insights for the future development of advanced Z-type photocatalysts.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
RuoKun Jia,PengPeng Wang,XiaoHang Yang,DuMin Li,JianGuo Qiao,TianXiang Li,JiaHui Chen
The rational modulation of the Si/Al ratio within molecular sieves holds utmost significance for augmenting photocatalytic activity. In this context, g-C 3 N 4 /HBeta composite photocatalysts were synthesised via a straightforward in situ thermal polymerisation procedure employing HBeta molecular sieves possessing multiple active sites and diverse Si/Al ratios. Through the variation of Si/Al ratios, the adsorption capacity, photogenerated carrier complexation efficiency, and active site characteristics could be effectively manipulated. The catalyst with the smallest Si/Al ratio (HBeta 25 ) exhibited the highest catalytic activity, with a hydrogen production efficiency of 2.346 mmol g⁻¹. This value was 4.9 times higher than that of pure g-C 3 N 4 , and the degradation efficiency of RhB was 3 times that of pure g-C 3 N 4 . The catalytic proficiency was principally validated by employing a comprehensive suite of techniques, including XPS, BET, SEM, and NH 3 -TPD. Our results demonstrate for the first time the strong potential of zeolite Si/Al ratio to modulate the catalytic activity of photocatalysts.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yaxuan Liu,Chen Yu,Huixia Lu,linan Liu,Jingchun Tang
Photocatalytic property of nano Ag is weak and its enhancement is important to enlarge its application. Herein, a novel strategy of constructing silver g-C 3 N 4 biochar composite (Ag-CN@BC) as photocatalyst is developed and its photocatalytic degradation of bisphenol A (BPA) coupled with peroxydisulfate (PDS) oxidation process is characterized. Characterization result showed that silver was evenly embedded into the g-C 3 N 4 structure of the nitrogen atoms format, impeding agglomeration of Ag by distributing stably on biochar. In optimum condition, BPA of 10 mg/L could be degraded completely at pH of 9.0 with a 0.5 g/L photocatalyst, 2 mM PDS in Ag-CN@BC-2 (Ag/melamine molar ratio of 0.5)/PDS system (99.2%, k = 4.601 h −1 ). Ag-CN@BC shows superior mineralization ratio in degrading BPA to CO₂ and H₂O via active radical way, including holes ( h ⁺), superoxide radicals (•O 2 ⁻ ), sulfate radicals (SO 4 • ⁻ ), and hydroxyl radicals (•OH). Proper amount of silver can be dispersed effectively by gC 3 N 4 , which is responsible for improving the visible-light absorbing capability and accelerate charge transfer during activation of PDS for BPA degradation, while biochar as carrier in the composite is supposed to enhance the photoelectric degradation of BPA by reducing the band gap and increasing the photocurrent of Ag-CN@BC catalyst. Ag-CN@BC exhibits excellent catalyst stability and photocatalytic activity for treatment of toxic organic contaminants in the environment.
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