Catalysts
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2024
·Vol. 14
·期 6
·335
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IF 3.8
Peng Jiang,Yang Yu,Kun Wang,Wenrui Liu
Excessive emissions of carbon dioxide have led to the greenhouse effect and global warming. Reducing carbon dioxide into high-value-added chemicals through solar energy is a promising approach. Herein, a g-C3N4/TiO2heterojunction photocatalyst with efficient electron transfer is designed for photocatalytic CO2reduction. The CH4(18.32 µmol·h−1·g−1) and CO (25.35 µmol·h−1·g−1) evolution rates of g-C3N4/TiO2are higher than those of g-C3N4and TiO2. The enhanced photocatalytic CO2reduction performance is attributed to the efficient charge carrier transfer in the g-C3N4/TiO2heterojunction. The electron transfer route was verified by in situ irradiated X-ray photoelectron spectroscopy (XPS). The photocatalytic CO2reduction mechanism on g-C3N4/TiO2was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This work provides a strategy for designing a polymer/metallic oxide heterojunction with efficient electron transfer for enhanced photocatalytic CO2reduction.
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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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2018
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IF 3.057
Minquan Sun,Shuling Shen,Zhujun Wu,Zhihong Tang,Jiaping Shen,Junhe Yang
A novel rice spike-like g-C 3 N 4 /TiO 2 nanowire heterojunctions are fabricated by hydrothermal treating Na 2 Ti 3 O 7 ultralong nanotubes in the presence of g-C 3 N 4 . The presence of g-C 3 N 4 promotes the hydrolysis of Na 2 Ti 3 O 7 ultralong nanotubes. The partially replaced O of TiO 2 by N from g-C 3 N 4 leads to the formation of a tight-binding interface between one dimensional TiO 2 and two dimensional g-C 3 N 4 , which is crucial for fast and effective transfer of photogenerated electrons in heterostructured photocatalysts . As a result, the g-C 3 N 4 /TiO 2 nanowire heterojunctions exhibit excellent visible-light photocatalytic activity. The kinetic constant (k) of g-C 3 N 4 /TiO 2 (0.024 min −1 ) for degradation of methylene blue under visible light irradiation is 1.85 and 4 times than that of pure g-C 3 N 4 and P25, respectively.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Xin Jiang,Han Jiang,Yimin Tang,Rui Wang,Wenxue Wang,Libin Yang,Bing Zhao
Semiconductor heterojunction with functional integration can be used as an excellent matrix for the ultrasensitive detection of bisphenol A (BPA) with low molecular affinity. Here, a simple, low-cost and sensitive surface-enhanced Raman scattering (SERS) strategy using g-C 3 N 4 /TiO 2 heterojunction as substrate was presented for detection of BPA residues in foods. The g-C 3 N 4 /TiO 2 achieved specific chemisorption for target analyte by the formation of intermolecular H-bond between g-C 3 N 4 and BPA. And, a high-efficiency carrier separation in TiO 2 induced by heterostructure could be achieved for charge transfer between the substrate and molecule by a “donor-bridge-acceptor” charge-transfer mode. Due to the synergistic/collaborative contributions of two monomers in heterojunction, the SERS enhancement factor was as high as 3.77 × 10 7 . The detection limit of BPA residues in foods (milk, juice and drinking water) was as low as 10 −9 mol·L −1 , far below the EU standard. The developed substrate also exhibited excellent stability and anti-interference capability.
研究领域:
分析化学
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环境科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·55044-55056
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IF 5.8
Bi Renke,Liu Jialong,Zhou Chutong,Shen Yijie,Liu Zhe,Wang Zhiyu
The construction of heterojunctions between semiconductors is a preferred route to improve overall photocatalytic activity. In this work, a facile and feasible method was innovatively developed to one-step prepare g-C 3 N 4 /TiO 2 heterojunctions via an absorption-calcination process using nitrogen and titanium precursors directly. This method can effectively avoid interfacial defects and establish a tight interfacial connection between g-C 3 N 4 and TiO 2 . The resultant g-C 3 N 4 /TiO 2 composites exhibited prominent photodegradation efficiency for tetracycline hydrochloride (TC-HCl) under visible light and simulated-sunlight irradiation. The optimal g-C 3 N 4 /TiO 2 composite (urea content of 4 g) showed the highest photocatalytic efficiency, which can degrade 90.1% TC-HCl under simulated-sunlight irradiation within 30 min, achieving 3.9 and 2 times increases compared to pure g-C 3 N 4 and TiO 2 , respectively. Besides, photodegradation pathways based on the role of active species ·O 2 − and ·OH were identified, indicating that a direct Z-scheme heterojunction was formed over the g-C 3 N 4 /TiO 2 photocatalyst. The enhanced photocatalytic performance can be attributed to the close-knit interface contact and the formation of Z-scheme heterojunction between g-C 3 N 4 and TiO 2 , which can accelerate the photo-induced charge carrier separation, broaden the spectra absorption range, and retain a higher redox potential. This one-step synthesis method may provide a new strategy for the construction of Z-scheme heterojunction photocatalysts consisting of g-C 3 N 4 and TiO 2 for environmental remediation and solar energy utilization.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Ruirui Hao,Guohong Wang,Chuanjia Jiang,Hua Tang,Qingchuan Xu
Semiconductor-based photocatalysis is a promising method for degradation of environmental pollutants, but the activity of most widely used photocatalysts such as titania (TiO 2 ) is still unsatisfactory under visible light. Herein, we synthesized a highly efficient visible-light-responsive heterojunction catalysts based on graphitic carbon nitride (g-C 3 N 4 ) and TiO 2 . The g-C 3 N 4 /TiO 2 heterojunction composites with high specific surface area were prepared via in situ hydrothermal synthesis followed by calcination , using titanium tetrachloride (TiCl 4 ) and melamine as precursors. Interesting, HCl from the hydrolysis of TiCl 4 served as the proton source to acidify the melamine. The g-C 3 N 4 /TiO 2 heterojunction composites exhibited higher photocatalytic performance for decomposition of Rhodamine B (RhB) than pure g-C 3 N 4 or TiO 2 under visible light irradiation. The high activity can be ascribed to the high specific surface area (up to 115.6 m 2 g −1 ) of the g-C 3 N 4 /TiO 2 composites and a synergistic heterojunction structure between TiO 2 and g-C 3 N 4 . Moreover, the photocatalytic performances of the g-C 3 N 4 /TiO 2 composites rely on the content of melamine in the synthesis precursors: with an optimum melamine content (3 g for 0.5 mL of TiCl 4 ), the sample showed the highest photocatalytic performance, which is superior to pure TiO 2 and g-C 3 N 4 by a factor of 18.7 and 3.5, respectively. Active species trapping experiments revealed that superoxide radicals and photogenerated holes played crucial roles in the photocatalytic reactions. The results will provide new ideas for the smart design and development of g-C 3 N 4 -based highly active photocatalysts with ultrahigh specific surface area for environmental and energy applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOM
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2025
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IF 2.3
Liang Yuanyuan,Dou Zhihe,Zhang Ting-an
Upgrading magnesium slag into value-added products provides a significant opportunity to address environmental waste pollution while promoting waste recycling. However, challenges such as the low catalytic activity of the resulting products and limited adsorption of macromolecular organic compounds at surface active sites remain critical engineering hurdles. In this paper, mesoporous g-C 3 N 4 /TiO 2 -MgAl 2 O 4 heterojunction photocatalysts were synthesized by a facile combustion method using magnesium slag, titanium dioxide, and carbamide as raw materials. Photocatalytic experiments on methylene blue solution under visible light irradiation at room temperature showed that the g-C 3 N 4 /TiO 2 -MgAl 2 O 4 heterojunction photocatalyst achieved a 25.6% higher degradation efficiency compared to traditional photocatalysts. This work provides a theoretical framework and practical experience for the value-added and low-cost preparation of photocatalytic materials derived from magnesium slag. Furthermore, a potential enhanced photocatalytic mechanism of g-C 3 N 4 /TiO 2 -MgAl 2 O 4 heterojunction photocatalysts is proposed.
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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光催化技术
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固体废弃物资源化
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Xiaoling Xue,Chongyi Wang,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Rong Chen,Qiang Liao
The use of a gas diffusion photoanode for a photocatalytic fuel cell is promising to simultaneously degrade VOCs and generate electricity. However, conventional gas-diffusion photoanode faces the issues of inefficient solar energy utilization and serious electron-hole recombination. Herein, a visible-light-responsive gas-diffusion g-C 3 N 4 /TiO 2 heterojunction photoanode is developed for simultaneous degradation of toluene and generation of electricity. In addition to the intrinsic feature of reduced mass transfer resistance of VOCs to the photocatalytic surface, such a gas-diffusion photoanode not only extends the photo-response spectrum, but also enhances charge separation. Accordingly, the photocatalytic fuel cell with the newly-developed photoanode demonstrates superior discharging performance and toluene removal efficiency over the gas-diffusion TiO 2 and g-C 3 N 4 photoanodes. The maximum power density achieved by the gas-diffusion g-C 3 N 4 /TiO 2 heterojunction photoanode is 0.0375 mW/cm², while the maximum toluene removal efficiency reaches 43.8 %. This study has promoted the development of photocatalytic fuel cells for the degradation of VOCs and electricity generation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Qiuyu Wang,Xingyu Huo,Jun Wang,Huanyu Chen,Ziwen Wang,Zhe Yin,Binglin Tang,Guoping Yu,Bo Lv
With the escalating energy crisis, clean and renewable hydrogen energy has emerged as a focal point of research. This study utilizes titanium concentrate as the primary raw material and employed a more convenient and efficient mechanical activation-oxidation-reduction-acid leaching process to effectively enrich TiO 2 , thereby producing a highly active and stable TiO 2 photocatalyst substrate. To further enhanced its photocatalytic performance, this research developed a heterostructured mineral-derived material g-C 3 N 4 /TiO 2 -6/Pt. Experimental results indicated that the hydrogen evolution rate of the g-C 3 N 4 /TiO 2 -6/Pt composite material reached 6.42 mmol/g/h within 5 h, whereas that of g-C 3 N 4 /P25/Pt was only 5.92 mmol/g/h. This study underscores the significance of extracting TiO 2 from titanium concentrate and its subsequent applications. By effectively utilizing titanium resources, it aims to address the increasing industrial demand for TiO 2 while providing innovative solutions to combat environmental pollution and mitigate the energy crisis. These findings hold substantial theoretical and practical implications for advancing related fields.
研究领域:
能源科学
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材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Sustainable Systems
·
2024
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IF 6.5
Aozhe Zhang,Weiqian Kong,Ziyi Guo,Zubin Wang,Qun Xu
Solar evaporators have demonstrated huge potential in sewage purification and clean water supply based on their cost-effective and sustainable merits. However, it remains challenging to realize the stable purification of high-concentration dye sewage over the long term. Here, by incorporating a heterojunction photocatalyst, a photothermal/catalytic integrated solar evaporator is conceived to stabilize the purification of high-concentration dye sewage. It is composed of g-C 3 N 4 @TiO 2 heterojunction as the photocatalyst, carbon nanotubes (CNTs) as the photothermal materials, and polyvinyl alcohol (PVA) network as water transportation material. The high photocatalytic activity of heterojunction enables the g-C 3 N 4 @TiO 2 /CNTs/PVA (CTCP) evaporator to photodegrade the accumulated dye molecules on its evaporation surface under light irradiation during purifying dye sewage. More remarkably, the integrated CTCP evaporator achieves a stable evaporation rate of 2.30 kg m −2 h −1 in 1 mg mL −1 RhB solution with continuous light irradiation for 100 h, exhibiting preeminent long-term stability. With the capacities of long-term stable and high-rate purification of high-concentration dye sewage, it is expected that this CTCP evaporator provides an effective alternative to treat high-concentration dye sewage and has direct implications in engineering multifunctional solar evaporators for complex wastewater treatment.
研究领域:
环境科学
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材料科学
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水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）