JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
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2025
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IF 1.8
Chenxi Zhang,Jingyi Wang,Sile Liu,Yue Han,Jinyu Wang,Hailong Wang
The widespread use of antibiotics has led to significant water pollution. Photocatalysis can effectively degrade antibiotics, but the performance is greatly limited by the photogenerated carrier recombination in the photocatalytic material g-C3N5. Constructing heterojunctions can enhance interfacial charge transfer, leading to more stable and efficient photocatalysis. This study synthesized a Fe2O3/g-C3N5 heterojunction using the solvothermal method. The Z-scheme charge transfer mechanism facilitated efficient separation of photogenerated carriers, preserving photoelectrons and holes with high redox activity. This process generated a substantial amount of highly reactive free radicals such as ·O2− and ·OH, enabling the efficient degradation of tetracycline (TC). Under the optimal conditions of initial concentration of TC was 200 mg/L, the quality ratio of Fe2O3 and g-C3N5 was 1:2, the catalyst dosage was 50 mg and pH = 7.0, the TC degradation rate reached 92.46% within 60 min of visible light irradiation. The photocatalytic activity’s enhancement was attributed to broad spectral absorption and effective photogenerated carrier separation. Furthermore, the photocatalytic performance can be affected by the presence of inorganic salt ions such as HCO3− and CO32−.
研究领域:
环境科学
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材料科学
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生物学
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DOI
PubMed
高影响因子
Processes
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2025
·Vol. 13
·期 1
·253
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IF 2.8
Sitong Liu,Shicheng Liu,Letao Li,Letong Yang,Xiaodong Wu,Zhichun Si,Rui Ran,Hui Wu
In this study, a combination of calcination and hydrothermal methods was employed to synthesize a honeycomb-like ZnO/g-C3N5(ZCN) heterojunction in situ. The ZCN heterojunction photocatalyst exhibits remarkable photocatalytic degradation performance, achieving a 97% methyl blue (MB) degradation rate with the rate constant of 0.0433 min−1(almost twice that of ZnO). Optical performance tests reveal that the ZCN heterojunction broadens the absorption edge to 710 nm and enhances the charge carrier separation. The presence of abundant oxygen vacancies, as revealed by X-ray photoelectron spectroscopy analysis, effectively suppresses the recombination of photogenerated electron–hole pairs. Furthermore, density functional theory simulations indicate that the combination of ZnO and g-C3N5creates an internal electric field due to their differing work functions. This leads to the formation of a Z-scheme heterojunction that effectively suppresses charge carrier recombination and preserves the strong redox capabilities of ZnO and g-C3N5. Finally, electron spin resonance results indicate thatO2−and OH are the primary active radicals involved in the degradation process. This study introduces a potential approach for the development of highly efficient Z-scheme photocatalysts for water treatment applications.
研究领域:
材料科学
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环境科学
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光催化
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Wanlin Gan,Zhiwei Yang,Yuhan Zhang,Yu Guo,Jing Zhang
In response to the current demand for the development of efficient and stable photocatalysts for sulfite (S(IV)) activation, this study introduces C 3 N 5 to activate S(IV) under visible-light (VL) irradiation and elucidates the mechanism of the VL/C 3 N 5 /S(IV) system to degrade organic pollutants. The k obs value for the removal of metronidazole in the VL/C 3 N 5 /S(IV) system reached 0.07245 min −1 in 12 min. Subsequently, the activation mechanism of S(IV) and the generation of reactive species were studied. The results indicate that the excellent degradation performance of the VL/C 3 N 5 /S(IV) system is due to the generation of carriers in C 3 N 5 under visible light. The S(IV) reacts with photogenerated holes, producing •SO 4 - and •OH in a chain reaction. This study not only broadens the application scope of C 3 N 5 as a photocatalyst but also presents a novel S(IV) activation strategy, enriching the understanding of S(IV) activation mechanisms.
研究领域:
环境化学
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光催化
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污染物降解
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材料科学
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水处理技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Jiaming Li,Jiawei Hu,Quan Jiang,Huan Yu,Wen Xiao,Diab Khalafallah,Fang Yu,Chao Liu,Feng Zhang,Qinfang Zhang
The construction of highly efficient photocatalysts for generating high-purity hydrogen (H 2 ) through a sustainable water decomposition system is a feasible option to replace conventional non-renewable energy resources. Here, we report a simple chemical reduction approach to embed Cu–Pt alloy nanocrystals on the C 3 N 5 (CN) matrix, creating a Schottky heterojunction. The structural morphology, crystal phase, light-harvesting capacity, and photo-electrochemical properties of as-prepared heterostructures were investigated. The uniformly anchored Cu–Pt alloy nanocrystals improve the photocatalytic H 2 evolution (PHE) activity by promoting the separation and transfer of photogenerated carriers and inhibiting recombination. Meanwhile, the alloyed nanocrystals strengthen the absorption of incident light energy, inducing photothermal energy. This improves the charge carrier separation and promotes the surface reaction kinetics. The PHE performance of as-developed catalysts could be adjusted by optimizing the molar ratio of Cu/Pt ions. Among them, the optimal Cu 1 Pt 3 /CN photocatalyst yields a higher PHE performance (672.85 μmol g −1 h −1 ). Notably, the Cu 1 Pt 3 /CN catalyst also reveals an enhanced photocatalytic activity for H 2 evolution in natural seawater. The possible PHE mechanism in CuPt/CN heterostructures is discussed toward the role of CuPt alloy deposition in boosting photocatalytic efficiency.
研究领域:
材料科学
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能源化学
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光催化技术
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2023
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IF 10.9
Jiawei Hu,Kai Xia,Ao Yang,Zhihao Zhang,Wen Xiao,Chao Liu,Qinfang Zhang
This study focuses on exploring efficient photocatalysts for water splitting, which holds great potential for harnessing hydrogen (H 2 ) as a renewable energy source. Modulating the heterojunction interface is known to enhance charge carrier separation and solar energy utilization, thereby boosting photocatalytic activity. In this work, a mechanical mixing-assisted self-assembly approach was developed to construct a heterojunction between NiPS 3 (NPS) nanosheets (NSs) and C 3 N 5 (CN) NSs. Specifically, two-dimensional (2D) NPS NSs were tightly deposited on 2D CN NSs surface to gain a 2D/2D heterostructure. The photocatalytic performance of the synthesized photocatalysts was determined by their ability to generate H 2 through water splitting, both in deionized (DI) water and seawater, under visible light. The resulting NPS NSs/CN NSs (NPS/CN) composites possessed boosted photocatalytic hydrogen evolution (PHE) activity related to CN NSs and NPS NSs. This improvement was assigned to the synergistic effect of increased light-harvesting capacity and heterojunction formation. Nevertheless, an excessive amount of deposited NPS NSs on the surface of CN NSs was found to reduce the light absorption of the CN NSs component in the NPS/CN composites, resulting in decreased PHE activity. Therefore, it was determined that an appropriate mass ratio between the two components is necessary to achieve excellent photocatalytic activity for the NPS/CN composites. The optimized photocatalyst, referred to as 3-NPS/CN, demonstrated the highest visible-light-driven PHE efficiency of 47.71 μmol·h −1 , which was 2385.50 times higher than that of CN NSs. Moreover, 3-NPS/CN also exhibited excellent PHE activity in seawater, with a rate of 8.99 μmol·h −1 . The photoelectrochemical, steady-state photoluminescence (PL), time-resolved PL (TR-PL), steady-state surface photovoltage (SPV) and time-resolved surface photovoltage (TPV) techniques were performed to investigate the charge separation and migration behaviors of various photocatalysts. Based on the characterization results, our group proposed a reasonable PHE mechanism. In the NPS/CN photocatalysts, photo-induced electrons rapidly migrated from the conduction band (CB) of CN NSs to the CB of NPS NSs due to the potential difference and strong interfacial electronic coupling between the two materials. The photogenerated electrons accumulated on the CB of the NPS NSs component efficiently reduced protons to generate H 2 molecules. Concurrently, photogenerated holes on the valence band (VB) of CN NSs and NPS NSs were consumed with the assistance of triethanolamine (TEOA) molecules. This study presents a facile method for fabricating 2D/2D heterostructured photocatalysts, which hold promise for efficient and robust implementation in energy applications. Download: Download high-res image (82KB) Download: Download full-size image
研究领域:
材料科学
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能源化学
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光催化技术
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Chi Ma,Zhigang Yu,Jingjing Wei,Chang Tan,Xu Yang,Tantan Wang,Guanlong Yu,Chang Zhang,Xin Li
Traditional Fenton reaction takes place at a low pH and generates waste. Additionally, the storage and transportation of liquid H 2 O 2 may pose safety risks. To overcome these disadvantages, an eco-friendly, efficient advanced oxidation process was established with ultrathin-C 3 N 5 photocatalyst coupling sodium percarbonate (SPC). Under visible light irradiation, up to 93.97% of SMZ was removed within 120 min. Such efficient removal was attributed to the high carriers separation efficiency of U-C 3 N 5 , which was certified by DFT calculations and characterization methods. All the factors (various anions, pH values, fulvic acid, light sources, and water matrices) had a slight influence on SMZ degradation. Moreover, the toxicities of SMZ and its intermediates were reduced after degradation. Finally, a gelatin aerogel/U-C 3 N 5 composite was obtained to facilitate the recycling of U-C 3 N 5 . This work highlights the combination of metal-free photocatalysis with SPC to degrade sulfonamide antibiotics and furthers the development of advanced oxidation process for micropollutant removal.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Yajie Wang,Yanan Gao,Jingxuan Yang,Bin Liu
C 3 N 5 is emerging as an important visible light catalyst because of its narrow band gap, nontoxicity and thermal stability. Herein, sulfur-doped g-C 3 N 5 (SCN) was prepared by copolymerization of thioacetamide (TAA) and 3-amino-1,2,4-triazole (3-AT). Then copper nanoparticles (Cu NPs) were anchored onto the SCN framework, resulting in the formation of Cu/SCN. It was found that the average H 2 production rate of SCN and Cu/SCN was 0.76 and 1.34 mmol g −1 h −1 , which was much higher than that of C 3 N 5 , respectively. Acting as a new active spots, sulfur doping effectively reduces the band gap of g-C 3 N 5 , and the formation of S-Cu bonds further creates an efficient electron transport pathway. As a result, Cu/SCN possesses a broader visible light absorption spectrum, stronger reduction capability, and greater efficiency in photo-induced carrier separation and transfer. Therefore, this work introduces a novel strategy for design of high efficiency photocatalytic H 2 evolution carbon nitride through non-noble metal and sulfur anchoring junction.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Huiming Zhang,He Bian,Fang Wang,Yaping Li,Lijun Zhu,Daohong Xia
Photocatalytic CO 2 reduction is a practical solution to the energy dilemma and environmental damage caused by greenhouse gases, and it is very important to explore high-efficiency photocatalysts. In this study, a novel Bi 2 WO 6 /C 3 N 5 step(S)-scheme heterojunction was successfully constructed and applied for CO 2 photoreduction. The 2D/2D structure showed excellent photocatalytic properties, with methane production reaching 1.976 μmol·g −1 ·h −1 and selectivity reaching 100 % under 5 hours of visible light irradiation. The result indicates that combining Bi 2 WO 6 and C 3 N 5 can promote interfacial charge separation and maintain the optimal reducing ability of photogenerated electrons. Based on experimental and theoretical calculations, we characterized the reaction mechanism and heterojunction formation mechanism. This study offers a novel approach to improve the selectivity and photocatalytic efficiency of CO 2 reduction products.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Shengwang Chen,Xiaoli Sheng,Yanyun Wang,Pingping Yu,Chenghan Yang,Xian Zhang,Hao Fang,Yiwei Zhang,Yuming Zhou
Nitrogen-rich C 3 N 5 has emerged as a promising visible light catalyst due to its narrow band gap. Nevertheless, its practical application is hindered by the rapid recombination of photogenerated carriers. To address this limitation and enhance the photocatalytic performance of C 3 N 5 -based photocatalysts, one effective measure involves the construction of heterojunctions in conjunction with other semiconductors. In this work, the C 3 N 5 /TiO 2 S-scheme photocatalysts was constructed by matching C 3 N 5 with a more negative conduction band (CB) and TiO 2 with a more positive valence band (VB). Photoelectric tests exhibited that the prepared photocatalysts possessed enhanced visible light photoresponsivity as well as excellent charge separation and transport efficiencies. The characterization results of XPS and EPR confirmed that the existence of internal electric field and the unique S-scheme charge transfer mechanism, which achieves overall spatial separation of effective photogenerated carriers and accelerates the recombination of redundant electrons and holes. The photocatalytic hydrogen production performance of the TCN2 is 6.9 times and 30 times higher than that of C 3 N 5 and TiO 2 , respectively, which is ascribed to the unique charge transfer mechanism of the S-scheme heterojunction and significantly enhanced photocatalytic activity. The simple construction of S-scheme heterojunctions in this work provides a new strategy for research in other fields.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
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2021
·Vol. 8
·期 14
·3566-3575
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IF 6.569
Libo Wang,Mohan Li,Qiu Zhang,Fengyan Li,Lin Xu
Global warming has caused us to seek a sensible strategy to replace the energy consumption of the Haber–Bosch approach in manufacturing ammonia. NH3 is utilized in agriculture to produce fertilizer to gratify the rapid increase of human food demand. Herein, we report the construction of a heterojunction that adopted g-C3N5 and Fe3+-doped W18O49 (Fe-W18O49) for photocatalytic nitrogen fixation for the first time. The surface of g-C3N5 was porous and fluffy, and its band gap energy was relatively narrow, which could adjust the absorption range of the hybrid and improve the utilization efficiency of light energy. Fe-W18O49 nanowires were rich in oxygen vacancies (OVs) that provided sufficient active sites for nitrogen adsorption and activation. The generated complex had excellent electron and hole separation ability, and the photogenerated carriers were successfully distributed to two different substances, which significantly elevated the nitrogen fixation capacity of the catalyst. The formation rate of ammonia reached 131.6 μmol g−1 h−1 when Fe-W18O49/g-C3N5 was employed as the catalyst for nitrogen fixation, which was obviously enhanced as compared with pure g-C3N5 or Fe-W18O49. This has provided the possibility to construct an inexpensive nitrogen fixation catalyst with outstanding catalytic properties.
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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产品关联
DOI
高影响因子
Environmental Science-Nano
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2024
·Vol. 11
·期 7
·3202-3213
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IF 5.8
Siyu He,Guanlong Wang,Yaoqi Liu,Lingzhi Luo,Tingting Jiang,Tianbin Fan,Xingyu Zhu,Yichao Ding,Jiang Jing,Sujun Guan
The photocatalytic activity of g-C3N5 is limited by its low photoelectric separation efficiency and high carrier recombination rate. To address this problem, the band gap of g-C3N5 was controlled via P doping, followed by deposition of a CoOOH·CoOx cocatalyst. The synthesized CoOOH·CoOx/P–C3N5 composite shows the characteristics of high photoelectric separation efficiency and low carrier recombination rate. DFT calculation and XPS revealed that P replaced the C atoms in g-C3N5 and interact with the Co atom to form an electron transport channel, showing P-dependent co-catalytic activity. The CoOOH·CoOx cocatalyst accelerated the electron transfer process of P–C3N5 while inhibiting the recombination of carriers and improving the photocatalytic reaction efficiency. The advantages of this strategy were verified by the degradation of TC, and the reaction rate of the obtained material was 59.6 times higher than that of pure g-C3N5. Using this strategy, the photoelectric separation efficiency was simultaneously enhanced, and then the fast recombination of the g-C3N5 carriers was effectively suppressed.
研究领域:
材料科学
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光催化
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理论计算
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产品关联
DOI
高影响因子
RSC Advances
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2021
·Vol. 11
·期 57
·36166-36173
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IF 3.361
Lixiao Han,Cong Peng,Jinming Huang,Shengyao Wang,Xiaohu Zhang,Hao Chen,Yi Yang
Planting highly efficient and low-cost Ni-based noble-metal-free active sites on semiconductors is of great significance in the field of photocatalysis. Herein, taking wide visible-light-responsive 2D C3N5 as a model semiconductor, an impressive near-zero-cost 2D S-doped nickel hydroxide (S–Ni(OH)2) is grown on C3N5 ultrafast within 30 min under ambient conditions by facile reaction between extremely low-cost Ni(NO3)2 and Na2S in aqueous solution. The fabricated 2D S–Ni(OH)2–C3N5 hybrid exhibits enhanced photocatalytic performance for both H2 production from water and NO removal for air purification. The H2 production rate on S–Ni(OH)2–C3N5 is ∼7 times higher than that of Ni(OH)2–C3N5 and even slightly higher than that of Pt–C3N5, demonstrating its potential as a candidate for noble metal catalysts like Pt. In particular, an apparent quantum yield (AQY) value of 30.9% at 420 nm for H2 production is reached on 1.0 wt% S–Ni(OH)2–C3N5 due to quick internal charge transfer efficiency. In addition, ∼42% of NO can be purified in a continuous flow reaction system. This work affords a cost-efficient strategy to steer the photocatalytic property of Ni-based catalysts.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
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