CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuan Wu,Jiangfu Zheng,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan
Design of green and low-cost single-atom catalysts (SACs) with high-performance is key to moving photocatalytic degradation of antibiotics toward applications. In order to achieve SACs for large-scale manufacturing, we prepared ultrathin flake carbon nitride (FCN) by low-energy-consuming physical knockout means, and also applied an in situ growth strategy with stable and easy-operating effect to anchor the Ru element on FCN in the form of single atom. Notably, in the PMS/Vis/0.5Ru-FCN system, the degradation rate of tetracycline achieved 100 % in just five minutes, with an apparent rate constant of 0.236 min −1 . Ru-FCN exhibits selective and stable determination due to narrow bandgap, unique photoresponsivity and low photogenerated carrier complexation rate. Mechanism investigation reveal that Ru-N 4 sites accelerated the electron transfer between Ru-FCN and PMS, while the low oxidation state of Ru elements reduced the risk for metal corrosion. DFT calculations predict the attack sites of reactive oxygen species. This work provides a rational explanation for the charge transfer and resistance to external disturbance by Ru single atom, and it also provides a new direction to enhance the efficiency of water treatment.
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MOLECULES
·
2024
·Vol. 29
·期 22
·5418
·
IF 4.2
Shuo Yang,Tianna Wu,Kaiyue Li,Ping Huang,Wenhui Li,Yuquan Zhuo,Keyan Liu,Ziwen Yang,Donglai Han
With the intensification of the energy crisis and the growing concern over environmental pollution, particularly the discharge of organic dye pollutants in industrial wastewater, photocatalytic degradation of these contaminants using solar energy has emerged as an effective, eco-friendly solution. In this study, we successfully synthesized 2D/2D g-C3N4/BiOI p-n heterojunctions via a simple precipitation method and a high-temperature calcination method. The unique 2D structures of g-C3N4nanosheets (NSs) and BiOI NSs, coupled with the synergistic effect between the two materials, significantly enhanced the photocatalytic degradation performance of the heterojunctions under simulated sunlight. The band structures, as determined by Tauc curves, Mott–Schottky curves and XPS-VB analysis, revealed a Z-scheme charge transfer mechanism that efficiently reduced charge carrier recombination and improved electron–hole separation. The photocatalytic activity of 2D/2D g-C3N4/BiOI p-n heterojunctions for rhodamine B (Rh B) degradation reached 99.7% efficiency within 60 min, a 2.37-fold and 1.27-fold improvement over pristine BiOI NSs and g-C3N4NSs, respectively. Furthermore, the heterojunction exhibited excellent recyclability stability, with the degradation efficiency decreasing by only 1.2% after five cycles. Radical scavenging experiments confirmed the involvement of superoxide radicals (∙O2−) and hydroxyl radicals (∙OH) as the primary reactive species in the degradation process. This work highlights the potential of 2D/2D g-C3N4/BiOI p-n heterojunctions for efficient photocatalytic applications in environmental remediation.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Menglu Zhang,Yueping Bao,Li-an Hou,Xiaoqiang An,Yiran Chai,Chuyang Y. Tang,Yiqun Fan,Yu Yang
This study presents a novel Co 3 O 4 /g-C 3 N 4 functionalized ceramic membrane (Co-CN-M) for emerging contaminants removal by integrating visible-light photocatalysis and peroxymonosulfate oxidation. The membrane was fabricated via in-situ growth of ZIF-67 on g-C 3 N 4 -modified substrates followed by calcination. The Co-CN-M overcomes the conventional trade-off between reactivity and permeability, simultaneously achieving outstanding degradation efficiency ( k = 0.24 min −1 for bisphenol A) and ultrahigh water flux (724 L·m −2 ·h −1 ·bar −1 ). This exceptional performance stems from: (1) the p-n heterojunction at g-C 3 N 4 /Co 3 O 4 interface that enhances charge transfer and Co 2+ /Co 3+ cycling, promoting h + /O 2 ·− -dominated degradation; and (2) a unique honeycomb morphology that facilitates mass transfer via enhanced surface properties and internal nanochannels. Application viability was also demonstrated by excellent antifouling and self-cleaning properties (>70 % flux recovery) and stable long-term (96 h) operation in surface water with minimal cobalt leaching (<0.007 mg·L −1 ). This work offers valuable insights into metal-organic framework (MOF)-based functional membrane fabrication for effective water purification.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanli Li,Mei Chen,Xinyi Sun,Minliang Zhang,Jinning Wang,Daqian Jiang,Ruobin Dai,Junjian Zheng,Xin Wang
Fouling, particularly biofouling caused by microbial adhesion and subsequent biofilm formation, limits the widespread applications of membrane-based technologies. Although integrating contact-killing agents ( i.e., quaternary ammonium compounds, QACs) to fabricate antibiofouling membranes has been proven as an effective approach to mitigate this issue, the long-term effectiveness of the modified membranes after foulants covering remains a challenge. Herein, hydrophilic photocatalyst nanosheet g-C 3 N 4 (NCN) was introduced into QAC-modified ultrafiltration (UF) membranes to address this limitation. Results showed that the hydrophilic surface of NCN can improve the antiadhesion properties of hydrophobic QAC modified membranes. Moreover, NCN can degrade organic and inorganic pollutants on QAC modified membrane surface under visible light, thereby restoring the antibacterial ability of QAC. Furthermore, the composite QAC/NCN modified membrane demonstrated long-term stability with sustained remarkable antibacterial performance even after numerous fouling-chemical cleaning cycles. These findings underscore the efficacy of the synergistic integration of contact-killing bactericidal activity and photocatalysis as a versatile and promising solution for combating biofouling, thereby contributing to the advancement of membrane technology in environmental remediation applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Chenxing Wang,Yinghao Xie,Yong Liu,Jing Wang,Shixiang Sun,Xiaoteng Jia,Qingrun Li,Liang Zhu,Fangmeng Liu,Geyu Lu
MXenes are characterized by high specific surface area and narrow band gap, while in-plan order MXene (i-MXene) provides enhanced ordered active sites through a vacancy structure, making it a promising 2D material for room temperature gas sensors. However, MXene-based gas sensors face challenges such as low response value, high limit of detection (LOD), poor recoverability, and long response/recovery time. Herein, we fabricated a room temperature gas sensor using g-C 3 N 4 /Mo 1.33 CT x sensing material and explored its sensing performance under visible light excitation. The visible light excitation brought a substantial enhancement in acetone sensing performance (328.8 % response in 2.5 ppm acetone), which was a 3.4-fold improvement compared with the dark scenarios. The LOD of the sensor was reduced to 50 ppb by visible light excitation, and the response/recovery time (15 s/34 s, in 2.5 ppm acetone) was drastically reduced with a high recovery level of > 97 %. Furthermore, mechanism exploration revealed that introducing g-C 3 N 4 material facilitates photogenerated carrier separation and increases gas adsorption sites, therefore achieving a higher gas response under light. This developed sensor achieved success in initial screening for diabetic ketoacidosis via breath analysis, thereby underscoring its potential for clinical diagnostic applications. This work contributes to explain the interaction of i-MXene with volatile organic compound molecules, and validates the prospect of i-MXene materials as sensitive materials for gas sensors.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Shuting Luan,Shiyi Zhang,Wenhua Zhang,Shiwen Lv,Xuchun Li,Xuhua Ren,Yanqing Cong
An efficient and stable catalyst is the key to electrocatalytic hydrogen production . Herein, a bifunctional electrocatalyst is developed for electrocatalytic hydrogen production by depositing S-doped g-C 3 N 4 on Co/Ni metal-organic framework electrode (namely CoNi-MOFs/S-g-C 3 N 4 ). Compared with the original Co/Ni metal-organic framework (CoNi-MOFs), the overpotential of hydrogen production on CoNi-MOFs/S-g-C 3 N 4 is reduced by 49.5 %, the charge transfer resistance is reduced by 74.5 %, and the electrochemically active area is expanded by 60.1 times. Moreover, CoNi-MOFs/S-g-C 3 N 4 can be used as an efficient bifunctional electrocatalyst for overall water splitting. Impressively, using CoNi-MOFs/S-g-C 3 N 4 as the anode and cathode, the hydrogen yield can reach 5.513 mmol h −1 and the energy consumption is 5.822 kWh Nm −3 at a current density of 250 mA cm −2 . In addition, an in-situ overall water splitting system was designed for hydrogen production using high-salt wastewater as water source without additional pre-desalination process, which realizes green hydrogen production and reduces the cost. The hydrogen yield was hold in the range of 5.2–5.3 mmol h −1 for a week, showing excellent performance of hydrogen production and strong stability. More importantly, the system can be applied to various high-salt wastewater with wider pH and salinity, and shows promising application potential for hydrogen production in actual wastewater.
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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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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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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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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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CHEMOSPHERE
·
2019
·
IF 5.108
Yahui Shi,Jinhui Huang,Guangming Zeng,Wenjian Cheng,Jianglin Hu,Lixiu Shi,Kaixin Yi
Photocatalytic membranes (PMs), coupling of membrane filtration and photocatalysis , have exhibited the potential for application in the wastewater treatment . In this study, we firstly adopted the supramolecular aggregates of melamine (M), cyanuric acid (C), and urea (U) in specific dimethyl sulfoxide (DMSO) as precursors to prepare carbon nitride MCU-C 3 N 4 with high photocatalytic performance, and a kind of novel-designed photocatalytic membrane was prepared via filtrating the mixture of graphene oxide (GO) nanosheets and MCU-C 3 N 4 on PVDF membrane supports, and then crosslinked using glutaraldehyde (GA) to construct a steady coating on the GO/MCU-C 3 N 4 /PVDF membrane. GO/MCU-C 3 N 4 /PVDF composite membrane exhibited higher permeation flux than that of GO/PVDF membrane and exhibited excellent separation performance for oil-in-water emulsion. A visible light-driven self-cleaning four-stage filtration by a self-built dead-end filtration system was carried out to evaluate membrane antifouling property, and GO/MCU-C 3 N 4 /PVDF membrane (M2) possessed higher flux recovery ratio (FRR) (∼92.36%) and lower irreversible fouling resistance (R ir ) ratio (∼8%) under 30min visible-light irradiation, maintaining relatively higher FRR (>72%) during 4 cycling of four-stage filtrating experiments. GO/MCU-C 3 N 4 /PVDF PMs are equipped with high permeation flux, separation performance, anti-fouling property and stability, indicating potential application in water treatment .
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