SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Wei Gan,Ruixin Chen,Li Zhang,Jun Guo,Naidong Chen,Wei Liu,Minfu Zhao,Zhaoqi Sun,Haihong Niu,Xucheng Fu
The combination of peroxymonosulfate (PMS) activation and photocatalytic process was an ideal approach for removing persistent organic pollutants. Here, we constructed a single-atom Co-modified S-scheme heterojunction (0.5CoCN/TiO 2 ) to achieve efficient photoexcitation synergistic PMS activation. Comprehensive characterization and theoretical calculation verified that the addition of Co atoms could strengthening the built-in electric field (BIEF) in heterojunction, which accelerates the rearrangement of Co(III)/Co(II). Meanwhile, the Co atoms bonded with the O in PMS accelerate the adsorption of PMS and facilitate the migration of photoexcitation electrons from CoCN to PMS, thereby boosting the generation of reactive oxygen species (ROS). Furthermore, Co atoms optimized the configuration of active sites, facilitating the simultaneous occurrence of non-radical pathways. Driven by the synergistic effects of Fenton-like reactions and photocatalytic reactions, the optimal heterojunction delivered outstanding catalytic activity, degrading 97.2% of sulfadiazine at a low PMS concentration. This research provides a novel strategy to promote the removal of environmentally persistent pollutants via photo-assisted PMS activation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yujiao Zhang,Yan Wang,Zhao Hu,Jinshu Huang,Song Yang,Hu Li
Exploring the real force that drives the separation of Coulomb-bound electron-hole pairs in the interface of heterojunction photocatalysts can establish a clear mechanism for efficient solar energy conversion efficiency. Herein, the formation of oxygen vacancy (Ov) and isolated Ti 3+ was precisely regulated at the interface of g-C 3 N 4 /TiO 2 Z-scheme heterojunction (g-C 3 N 4 /Ov-Ti 3+ -TiO 2 ) by optimizing the opening degree of the calcination system, showing excellent production rate of CO and CH 4 from CO 2 photoreduction under visible light. This photocatalytic system also exhibited prominent stability. Combining theoretical calculation and characterization, the introduction of Ov and isolated Ti 3+ on the interface could construct a charge transfer channel to break the forbidden transition of n → π*, improving the separation process of photoexcited electron-hole pairs. The photoexcited electrons weakened the covalent interaction of C O bonds to promote the activation of adsorbed inert CO 2 molecules, significantly reducing the energy barrier of the rate-limiting step during CO 2 reduction. This work demonstrates the great application potential of reasonably regulating heterojunction interface for efficient photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jiayi Wang,Penggang Ren,Yanli Du,Xueyan Zhao,Zhengyan Chen,Lu Pei,Yanling Jin
Graphitic carbon nitride (g-C 3 N 4 ) is a promising photocatalyst with lots of merits, such as visible light driven (200–1000 nm), cost-effective and high stability. However, the single g-C 3 N 4 photocatalyst is limited in its performance due to the high complexation rate of photogenerated electrons and holes and the confined specific surface area. Herein, a S-scheme heterojunction catalyst involving tubular g-C 3 N 4 (TCN) and TiO 2 is designed and constructed via precursor reforming strategy with subsequent hydrothermal calcination process. The tubular structure offers more active centers, conducive to light absorption and contact with pollutants, while the heterojunction facilitates the transfer and separation of electrons and holes. Thus, the TCN/TiO 2 catalyst exhibits excellent photocatalytic activity with degradation efficiencies for methylene blue (MB) and tetracycline (TC) reaching 96.6 % and 100 %, respectively, as well as high degradation efficiency for other dyes (Congo red and Eosin y). Besides, TCN/TiO 2 catalyst demonstrates outstanding stability and potential for practical application. An innovative S-scheme heterojunction system has shown remarkable potential for improving the separation and transferring electron-hole pairs, as well as delivering stronger redox capability. This work provides a promising strategy for the preparation of g-C 3 N 4 /TiO 2 catalyst for the effective treatment of contaminated water.
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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DOI
高影响因子
ELECTROCHIMICA ACTA
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2017
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IF 4.798
Fengxia Zhang,Ping Zhang,Qiong Wu,Wenjing Xiong,Qi Kang,Dazhong Shen
Herein, we proposed a simple method to measure the inner resistance of a photoelectrochemical (PEC) sensor. Three photoanodes, including TiO 2 nanotubes array (TiO 2 NTs), g-C 3 N 4 /TiO 2 NTs and Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs (BTC = 1,3,5-benzene- tricarboxylic acid), were chosen as the models. It was shown the change in inner resistance of the photoanode is the main factor for the photocurrent response in a PEC sensor. Under light excitation, the inner resistance of the photoanode is reduced remarkably, resulting in the increment in the photocurrent. The influence of the light intensity on the inner resistance is less than that on the photocurrent, due to the synchronous change in photovoltage . With increasing concentration of hole scavengers (e.g., H 2 O 2 , ascorbic acid), the steady inner resistances of the three photoanodes are decreased. In the PEC sensor with Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs, the Mn 3 (BTC) 2 layer is served as a size-exclusion filter to prevent the diffusion of molecules with size larger than the apertures in crystals, which improves the selectivity of the PEC sensor to smaller molecules (e.g., H 2 O 2 ). The catalytic effect of Mn 3 (BTC) 2 to H 2 O 2 enhances the PEC response sensitivity to H 2 O 2 . Under optimized conditions, the reciprocal of the averaged steady effective inner resistance of Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs is in a linear correlation with the logarithmic concentration of H 2 O 2 in the range of 0.003 to 10 μM with a limit of detection of 1 nM. This PEC sensor was applied for H 2 O 2 determination in exhaled breath condensate samples.
研究领域:
分析化学
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材料科学
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生物医学工程
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高影响因子
Catalysts
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2023
·Vol. 13
·期 2
·238
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IF 3.9
Qing Jin,Youlin Xiang,Lu Gan
Indoor formaldehyde pollution causes a serious threat to human health since it is uninterruptedly released from wooden furniture. Herein, we prepared a g-C3N4-modified TiO2composite photocatalyst and coated it on the surface of a commercial artificial particle board with the assistance of melamine formaldehyde adhesive. The g-C3N4/ TiO2coating was then used to degrade formaldehyde which was released in real-time from the particle board under the irradiation of visible light. The results showed that compared with pure TiO2, the g-C3N4/ TiO2composite with a heterojunction structure had a lower band gap energy (~2.6 eV), which could effectively capture luminous energy from the visible light region. Under continuous irradiation, the g-C3N4/ TiO2photocatalytic coating was capable of degrading more than 50% of formaldehyde constantly released from the particle board. In the meantime, the photocatalytic coating also exhibited promising catalytic stability towards various formaldehyde release speeds, air flow velocities and environmental humidities. The hydroxyl radical and superoxide radical were found to be the predominant active species which triggered formaldehyde degradation. This study provides a feasible and practical approach for the improvement in indoor air quality through photocatalyst surface engineering.Keywords:photocatalyst;TiO2;g-C3N4;heterostructure;formaldehyde degradation
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
OPTICAL MATERIALS
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2025
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IF 4.2
Bo Li,Yujia Liu,Lishuai Song,Yuyu Zhang,Nan Liu,Zequan Li
Absrtact This study successfully constructs a g-C 3 N 4 /TiO 2 heterojunction and its Pt nanocluster-modified composite (Pt C –CN–TiO 2 ) through an interface engineering strategy, systematically investigating their photocatalytic RhB degradation performance and mechanisms. Under visible light irradiation, Pt C –CN–TiO 2 achieves a RhB degradation efficiency of 99.29 % within 160 min, with a 34.3 % increase in reaction rate constant compared to the Pt-free catalyst. Mechanistic studies reveal that Pt acts as an electron sink, facilitating the generation of ·O 2 − , while inducing interfacial electronic structure renormalization to enhance surface hydroxyl adsorption and oxygen vacancy activity. Cycling experiments confirm its exceptional stability. This work provides novel interface engineering insights and theoretical foundations for designing highly efficient and stable solar-driven photocatalysts.
研究领域:
材料科学
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环境科学
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纳米技术
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光催化
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高影响因子
Journal of Environmental Chemical Engineering
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2026
·Vol. 14
·期 3
·122586
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IF 7.5
Wenyuan Yan,Qiwen Zhou,Lele Zhan,Qinghua Liu,Jinquan Xu,Sheng Liu
A flow injection photoelectrochemical (FI-PEC) system for the rapid, sensitive, and continuous detection of copper ions (Cu 2 + ) in aqueous solutions was developed. The PEC system integrates a custom-designed 3D-printed thin-layer flow cell (volume of 390 µL), enabling efficient mass transfer. The PEC sensor is based on a g-C 3 N 4 /TiO 2 heterojunction photoanode, which was synthesized in situ on a fluorine-doped tin oxide (FTO) substrate via hydrothermal and calcination processes. The obtained g-C 3 N 4 /TiO 2 composite has a flower-like array structure and exhibits enhanced photo response under illumination, with a photocurrent density of 0.34 mA/cm 2 . The g-C 3 N 4 /TiO 2 PEC sensor can be efficiently regenerated using EDTA, allowing for multiple detection cycles without significant performance degradation. The system demonstrates a wide linear detection range of 0.1–150 µM, a low detection limit of 0.043 µM, excellent selectivity against common interfering ions, and maintains good stability after 10 h of continuous operation. These results indicate that the FI-PEC system based on the g-C 3 N 4 /TiO 2 heterojunction photoanode has practical application prospects in monitoring copper pollution in natural environments.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Ze’ai Huang,Qiong Sun,Kangle Lv,Zehui Zhang,Mei Li,Bing Li
In this paper, effect of contact interfaces of high-energy TiO 2 , (1 0 1) and (0 0 1) facets, with g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /TiO 2 hybrid was studied using TiO 2 hollow nanobox (TiO 2 -HNB) assembly from high-energy TiO 2 nanosheets (TiO 2 -NS) as model. The prepared photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), nitrogen sorption , Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectrometer (XPS). The photoreactivity of the photocatalyst was evaluated by measure the formation rate of photo-induced hydroxyl radicals ( OH) using coumarin as a probe molecule and photocatalytic degradation of Brilliant Red X3B (an anionic dye) under UV irradiation ( λ = 365 ± 10 nm). It was found that g-C 3 N 4 /TiO 2 -HNB forms direct Z-scheme photocatalytic system, which shows superior enhancement on the photocatalytic activity of TiO 2 than g-C 3 N 4 /TiO 2 -NS. It is by contacting g-C 3 N 4 with (1 0 1) facets, g-C 3 N 4 can efficient remove the photo-generated electrons accumulated on (1 0 1) facets of high-energy TiO 2 , which results in spatially isolated photo-generated electrons and holes, enhancing the photocatalytic activity.
研究领域:
材料科学
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环境科学
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光化学
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高影响因子
Advanced Sustainable Systems
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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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高影响因子
危险品化学品经营许可证（带存储）