JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zhangwei Sun,Yuhao Qi,Kaile Wang,Jiaming Li,Xiaoyu Qiu,Yunhe Zhao,Li Guo
In this study, we developed an in-situ deposition method to load small-sized AgI nanoparticles as an oxidative photocatalyst (OP) onto phosphorus (P) and potassium (K) co-doped two-dimensional porous g-C 3 N 4 (PK-CN-N) as a reductive photocatalyst (RP), forming an S-scheme heterojunction photocatalyst AgI/PK-CN-N. PK-CN-N achieved morphology control and element doping, leading to surface functionalization and heterostructure formation for the AgI/PK-CN-N photocatalyst. Notably, the 50AgI/PK-CN-N composite demonstrated an approximately 95 % removal efficiency for RhB within 30 minutes, 17.6 times higher than pure g-C 3 N 4 , surpassing most reported g-C 3 N 4 -based photocatalysts. The enhanced photocatalytic efficiency is attributed to the surface modification strategy and heterostructure formation of g-C 3 N 4 , which broadens the visible light response range, increases the number of active sites, improves the separation of photogenerated electron-hole pairs, and enhances REDOX capabilities. The band structure of the composite was elucidated through Mott-Schottky analysis and UV–vis DRS. The formation of the AgI/PK-CN-N S-scheme heterojunction and its charge transfer mechanism was confirmed through XPS, band structure analysis, KPFM, and EPR spectroscopy. Experimental data confirmed the presence of a strong and effective interface electric field between the two semiconductors, leading to band bending and accelerated charge separation. Additionally, the introduction of small-sized AgI semiconductors enhanced the exposure of the coupling interface, further improving catalytic performance. The reusability and lifespan of the catalyst were also analyzed, showing that after four cycles, the photocatalytic activity remained above 92 %.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Li Longyun,Xiao Kunkun,Zhang Jinpu,Du Ruihan,Kang Chunli
This study successfully synthesized a composite photocatalyst g-C 3 N 4 /PbTiO 3 through hydrothermal and calcination methods using PbTiO 3 and g-C 3 N 4 . The catalyst was characterized by XRD, FTIR, Raman, XPS, SEM, TEM, UV–vis DRS, PL, and other techniques. The results indicate that the composite photocatalyst exhibits efficient electron transfer, enhanced light absorption, effective separation and utilization of photogenerated electron–hole pairs, demonstrating superior photocatalytic activity. Under simulated sunlight, the removal efficiency of methyl blue (MB) with an initial concentration of 10 mg/L reaches 93.0% after 120 min. After five cycles, the degradation efficiency of MB is 79.2%, still maintaining 85% of the initial catalytic activity. The pH values in the range of 4.0–7.0, inorganic anions, and water quality have a minimal impact on the photocatalytic degradation of MB. Additionally, the composite photocatalyst exhibits strong removal capabilities for other pollutants, such as tetracycline. Therefore, the prepared catalyst demonstrates good feasibility for practical applications. Free radical quenching experiments indicate that hydroxyl radicals (·OH) are the primary active groups in the photocatalytic degradation of MB. Based on this, a photocatalytic mechanism involving a S-scheme heterojunction has been proposed. This study provides new insights into preparing PbTiO 3 composite semiconductors and constructing novel S-scheme heterojunctions.
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Biosensors-Basel
·
2024
·Vol. 14
·期 12
·586
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IF 4.9
Xiaowei Fan,Guping Zhang,Xiaodi Li,Yao Wang,Yi Wang,Shilei Hao,Defang Liu
In this study, we have proposed an electrochemiluminescence (ECL) signal amplification system which is based on two-dimensional (2D) flower-like CdS@Co/Mo-MOF composites as a co-reaction accelerator of the g-C3N4/S2O82−system for ultrasensitive detection of chlorpromazine hydrochloride (CPH). Specifically, the 2D flower-like Co/Mo-MOF with mesoporous alleviated the aggregation of CdS NPs while simultaneously fostering reactant-active site contact and improving the reactant–product transport rate. This allowed the material to act as a novel co-reaction accelerator, speeding up the transformation of the S2O82−into SO4•−and enhancing the cathodic ECL emission of g-C3N4. Moreover, the signal probe which was synthesized by coupling the 2D CdS@Co/Mo-MOF and graphitic carbon nitride (g-C3N4) achieved the generation of SO4•−in situ and reduced energy loss. The results confirmed that the ECL signal was enhanced 6.2-fold and stabilized by CdS@Co/Mo-MOF. Based on the extremely strong quenching effect of chlorpromazine hydrochloride (CPH) on this system, a “signal-off” type sensor was constructed. The sensor demonstrated excellent sensitivity and linear response to CPH concentrations ranging from 1 pmol L−1to 100 μmol L−1, with a low detection limit of 0.4 pmol L−1(S/N = 3).
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2025
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IF 6.3
Yanhua Cui,Yixuan Hong,Weilong Shi,Zengkai Wang
Background Photocatalytic membrane technology has attracted widespread concern in the field of water purification due to its high-efficiency and eco-friendly. However, the active sites of photocatalyst are easily embedding in the polymer membrane, consequently reducing degradation efficiency of photocatalytic membrane. Methods In this study, two-dimensional/two-dimensional regenerated silk fibroin-carbonized carbon modified graphite carbon nitride/bismuth vanadate heterojunction (2D/2D C-g-C 3 N 4 /BiVO 4 ) with excellent photocatalytic performance was synthesized by electrostatic self-assembly method. Then C-g-C 3 N 4 /BiVO 4 heterojunction was selected as catalytic structural units, three-dimensional (3D) interfacial networked poly(vinylidene fluoride) membrane-supported C-g-C 3 N 4 /BiVO 4 heterojunction (C-g-C 3 N 4 /BiVO 4 /PVDF) was fabricated by electrospinning technique. The combination of C-g-C 3 N 4 /BiVO 4 heterojunction and interfacial networked PVDF membrane synergistically enhanced their permeability, antifouling and antibacterial performance. Significant findings The optimized C-g-C 3 N 4 /BiVO 4 /PVDF photocatalytic membrane had higher degradation TC efficiency (83.33 %) than other membrane samples, and the efficiency of bacterial inactivation of C-g-C 3 N 4 /BiVO 4 /PVDF could reach 99.00 %. The C-g-C 3 N 4 /BiVO 4 /PVDF exhibited tremendous enhancement in the permeability (13,488.2 L m −2 h −1 ) and flux recovery efficiency (94.44 %). The free radical trapping tests and ESR spectra indicated that superoxide radical (·O 2 ⁻ ) was the dominant active species. In addition, the as-prepared C-g-C 3 N 4 /BiVO 4 /PVDF could easily recover and reuse, and photocatalytic activity basically remain unchanged, highlighting the potential application of membrane photocatalyst for the practical wastewater treatment.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2024
·Vol. 50
·期 6
·2455-2476
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IF 2.8
Yan Jia,Hu Cheng,Zhang Lianhong
Graphitic carbon nitride (g-C 3 N 4) faces limitations in its photocatalytic applications due to its inherently wide bandgap (2.7 eV), low utilization of visible light, and a high rate of recombination of photogenerated electron–hole pairs. Defect engineering can effectively enhance the ability of g-C 3 N 4 photocatalysts to address environmental pollution. In this paper, g-C 3 N 4 materials with N defects (AA-CN15) were successfully prepared by using urea as a hydrogen bond donor and ammonium acetate as a hydrogen bond acceptor. The catalyst exhibits a broader range of visible light absorption, a lower rate of photogenerated electron–hole recombination, and a larger specific surface area, thanks to the formation of N defects in the N1 (C=N–C) vacancy. The formation of N defects reduces the band gap width of AA-CN15 from 2.85 eV to 1.90 eV compared to U-CN. The degradation rate of AA-CN15 in a 30 mg/L MB solution under visible light irradiation can reach 91.4% within 100 min, which is 7.2 times higher than that of U-CN. This study addresses the limitations and drawbacks of traditional defect introduction methods, offering a novel approach for the synthesis of N defect g-C 3 N 4 materials.
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Journal of Water Process Engineering
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2024
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IF 6.3
Bingkun Liu,Guanghui Wang,Jinyang Li,Beibei Liu,Ruoyu Li,Hongda Huang,Hengzhen Shi,Jingtao Zhang
MoS 2 quantum dots decorated g-C 3 N 4 /AgI Z -scheme heterostructures were successfully prepared and applied in tetracycline hydrochloride (TCH) degradation and Escherichia coli ( E. coli ) disinfection upon visible light exposure. The ternary heterojunction achieved highly efficient photocatalytic abilities, which could eliminate 82.8 % of TCH in 50 min and absolutely kill E. coli in 40 min, superior to those of bare g-C 3 N 4 , AgI, g-C 3 N 4 /MoS 2 and g-C 3 N 4 /AgI binary composites. Benefiting from the Z -scheme heterostructure, the separation and migration efficiency of charge carriers in the g-C 3 N 4 /MoS 2 /AgI composite was greatly improved, which led to more effective production of predominant O 2 − and OH during the photocatalytic process. This work delivered an example of highly efficient composite photocatalyst and discussed the role of MoS 2 QDs as charge transfer mediator in Z -scheme photocatalytic system.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Junjie Wang,Zhihao Lu,Kun Gao,Xing Kang,Chengcheng Zhu,Furong Qiao,Haonan Chen,Zhuoyao Li,Wei Huang,Gang Lu
Photocatalytic reforming of ethanol provides an effective way to produce hydrogen energy using natural and nontoxic ethanol as raw material. Developing highly efficient catalysts is central to this field. Although traditional semiconductor/metal heterostructures (e.g., Rh/TiO2) can result in relatively high catalyst performance by promoting the separation of photoinduced hot carriers, it will still be highly promising to further improve the catalytic performance via a cost-effective and convenient method. In this study, we developed a highly efficient photocatalyst for ethanol reformation by preparing a ternary composite structure of Rh/TiO2/g-C3N4. Hydrogen is the main product, and the reaction rate could reach up to 27.5 mmol g–1 h–1, which is ∼1.41-fold higher than that of Rh/TiO2. The catalytic performance here is highly dependent on the wavelength of the light illumination. Moreover, the photocatalytic reforming of ethanol and production of hydrogen were also dependent on the Rh loading and g-C3N4:TiO2 ratio in Rh/TiO2/g-C3N4 composites as well as the ethanol content in the reaction system. The mechanism of the enhanced hydrogen production in Rh/TiO2/g-C3N4 is determined as the improvement in the separation of photoinduced hot carriers. This work provides an effective photocatalyst for ethanol reforming, largely expanding its application in the field of renewable energy and interface science.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Hongbin He,Bolong Liang,Shumin Lin,Yan Chen,Xin Zhang,Shu-Xuan Liang
The residues of oxytetracycline hydrochloride (OTC) in water have potential adverse effects on human health and ecological environment. Photocatalytic degradation has been widely studied in the treatment of antibiotic pollution due to its environmentally friendly and efficient characteristics. However, the band gap of traditional photocatalysts is too wide, and the recombination of photogenerated electrons and holes is serious, which has negative effects on photocatalysis . Therefore, the Z-scheme heterojunction g-C 3 N 4 @MIL-101(Fe) composite photocatalyst was synthesized by high temperature calcination combined with solvothermal method. g-C 3 N 4 @MIL-101(Fe) was characterized by XRD, FTIR , SEM, TEM and other tests. All the results showed that the compound was successful A series of photoelectric tests showed that g-C 3 N 4 @MIL-101(Fe) has a narrower band gap, stronger light absorption ability, and improved the separation rate of photogenerated electrons and holes. Under visible light irradiation, g-C 3 N 4 @MIL-101(Fe) could remove 87.68% of OTC in 300 min. g-C 3 N 4 @MIL-101(Fe) showed good potential for practical application in five real water samples and stability after six cycles. Finally, superoxide radicals and hole radicals were identified as the main reactive species in the photodegradation process. The mechanism and pathway of the photocatalytic degradation of OTC by g-C 3 N 4 @MIL-101(Fe) are proposed. This work expands the construction and application of Fe-MOF based Z-scheme heterostructure and provides a new idea for water pollution remediation.
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Journal of Water Process Engineering
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2024
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IF 6.3
Wei Gao,Xiaoying Xu,Xueqi Han,Ling Zhang,Haitao Ding,Chengxun Deng
A multicomponent system consisting of dielectric barrier discharge (DBD), g-C 3 N 4 /FOD composite catalysis, and persulfate (PS) oxidation was successfully constructed for synergistically degrading trichloroethylene. The successful preparation of the g-C 3 N 4 /FOD composite catalyst material was confirmed through various testing methods, including Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectrometer (FT-IR), X-ray Photoelectron Spectroscopy (XPS) and Electrochemical workstation. Under this composite system, trichloroethylene degradation efficiency in water reached 93.2 % after an 8-minute reaction. Thermal gravimetric analysis (TG) and cyclic usage experiments both demonstrated the excellent stability of the g-C 3 N 4 /FOD catalyst removal efficiency of the composite as concentration, DBD discharge voltage and carrier gas flow rate, g-C 3 N 4 /FOD dose, and PS concentration. Optimal treatment conditions were determined through response surface methodology (RSM) experiments. Within a reaction time of 30 min, a total organic carbon (TOC) removal rate of 87.4 % was achieved, effectively reducing intermediate product formation and making the combined process more environmentally friendly than individual treatments. Experimental evidence SO 4 − , OH and O 2− played dominant roles during trichloroethylene degradation in water. Gas chromatography–mass spectrometry analysis identified potential pathways for trichloroethylene degradation and revealed two major intermediate products. Toxicity prediction results for these degradation products showed lower acute toxicity and chronic toxicity compared to the precursor compound.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Decai Yang,Yongqi Li,Fuhua Mao,Chao Qu,Lanyang Wang,Youguo Luo,Kexin Shi,Qing Ye
Recently, a visible-light-driven photocatalysis coupled peroxydisulfate (PDS) activation system was developed for improving the efficiency of antibiotics degradation in wastewater. A Z -scheme FeOOH/CNNS photocatalyst was successfully applied for tetracycline (TC) degradation. In this study, graphene oxide (GO) was introduced into the fabrication procedure of the former catalyst. The optimzed FeOOH/GO/CNNS photocatalyst achieved 98.8 % TC degradation within 40 min (k = 0.0964 min −1 ), which was 2.58 and 8.53 times compared to FeOOH/CNNS and CNNS, respectively. This significant improvement can be attributed to the fact that 2D porous CNNS and GO can increase the surface area and active sites, avoiding FeOOH aggregation. Next, narrow-bandgap FeOOH improves visible-light utilization, while GO acts as an interfacial bridge to form an all-solid-state Z -scheme heterojunction, accelerating carrier separation and inhibiting recombination. Finally, radical trapping confirms • O 2 − , • OH, SO 4 •- , and h + synergistically degrade TC. This design provides a novel strategy for PDS-based efficient photocatalytic advanced oxidation.
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ChemCatChem
·
2025
·
IF 3.9
Tianao Zhang,Haolong Huang,Yunchong Wang,Qianqian Zhao,Rui Han,Qingling Liu
Graphical CoO x /BCN catalyst with dual active sites was successfully synthesized. This catalyst exhibits excellent selectivity (99%) and a cyclic carbonate yield (98%) in the CO 2 cycloaddition reaction with the nucleophilic reagent KI under solvent-free and mild reaction conditions. This catalyst also has good stability and reusability, providing a new direction for the design of high-performance CO 2 cycloaddition catalysts. The carbon dioxide (CO 2 ) cycloaddition reaction provides an efficient route to achieve resource utilization of CO 2 . However, the inherent chemical stability of CO 2 itself hinders its efficient transformation into cyclic carbonates. Herein, the CoO x /BCN catalyst was successfully prepared by a simple deposition method. The CoO x /BCN exhibited excellent catalytic performance in the CO 2 cycloaddition reaction synergistically catalyzed with the nucleophilic reagent KI under solvent-free and mild reaction conditions (80 °C, 0.8 MPa, 6 h). The yield of cyclic carbonate was 98% and the selectivity was 99%, which was significantly superior to CoO x /CN catalyst (with a cyclic carbonate yield of 73.7%). Furthermore, after six cyclic reactions, CoO x /BCN still maintained a yield of over 93%. It was found that after boron (B) was doped into graphitic carbon nitride (g-C 3 N 4 ), the generated ─NB(OH) 2 group on CoO x /BCN effectively activated the epoxide. Importantly, the interaction between B-doped g-C 3 N 4 and CoO x induced the generation of abundant oxygen vacancies, which provided sufficient active sites for CO 2 adsorption and activation. In addition, carbonates were identified as the main reaction intermediates by in situ DRIFTS, and the possible reaction pathways of the CoO x /BCN catalyst were proposed. Therefore, this work provides new idea for the design of catalysts for CO 2 cycloaddition.
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高影响因子
Journal of Water Process Engineering
·
2025
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IF 6.7
Jin Chen,Ke Li,Jie Yan,Suqing Qin,Yuzhao Ma,Xiaofeng Yang,Yanjun Li
Designing heterojunction photocatalysts with staggered band structures and optimal interfacial interactions constitutes a feasible strategy to achieve superior photocatalytic performance. Herein, we synthesized a Pt@BiOBr/g-C 3 N 4 S-scheme heterojunction via in-situ construction and photochemical deposition. Notably, Platinum nanoparticles (NPs), precisely deposited via photochemical reduction, extend light absorption into the visible-NIR spectrum through localized surface plasmon resonance (SPR) while acting as electron mediators to suppress recombination. Under simulated solar irradiation, the optimized Pt@BiOBr/g-C 3 N 4 S-scheme heterojunction demonstrates complete degradation of tetracycline hydrochloride (TC-HCl) within 10 min. Additionally, the photocatalyst showed exceptional degradation efficiency for organic dyes including methyl orange (MO) and rhodamine B (RhB). More importantly, the synergistic interplay between internal electric field (IEF) and the SPR of Pt nanoparticles collectively facilitates rapid charge separation while suppressing electron-hole recombination. This study offers a path toward highly effective photocatalysts engineered for practical applications and elucidates the activity enhancement mechanism through Pt incorporation in ternary heterojunction systems.
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