Surfaces and Interfaces
·
2024
·
IF 5.7
Feihu Mu,Shengpan Xu,Meixin Li,Yuqiu Yang,Xiaozhong Chu,Zhipeng Cheng,Xujing Guo,Jiming Xu,Benlin Dai,Chang-Ha Lee
Large amounts of carbon are stored primarily in dissolved organic matter (DOM), which plays an important indicator of lake eutrophication. However, removing DOM from eutrophic lakes remains a major challenge. Herein, a novel S-scheme flower-like microsphere BiVO 4 /nanosheet g-C 3 N 4 3D/2D heterojunction was successfully constructed using a two-step method for DOM degradation of real eutrophic lake water in the presence of peroxydisulfate (PDS). 1.0-BiVO 4 /g-C 3 N 4 /PDS exhibited highly efficient photocatalytic performance with an 87.8 % removal rate of DOM for 60 min, which was 5.3 and 8.9 times higher than BiVO 4 /PDS and g-C 3 N 4 /PDS, respectively. Sulfate radical (·SO 4 − ), hydroxyl radical (·OH) and singlet oxygen ( 1 O 2 ) were mainly responsible for DOM degradation in the 1.0-BiVO 4 /g-C 3 N 4 /PDS system, and the transformation pathway of 1 O 2 was emphatically analyzed. In addition, the changes of fluorescence components in DOM were detected using synchronous fluorescence spectra, second derivative spectra, and two-dimensional correlated spectroscopy analysis. Humic-like fluorescence, fulvic-like fluorescence, and protein-like substances were removed higher than 85.30 %, 73.02 %, and 67.23 % by the 1.0-BiVO 4 /g-C 3 N 4 catalyst activating the PDS under visible light (VL), respectively. When the toxicity of catalytically treated eutrophic lake water was estimated by growth inhibition of Escherichia coli , the biotoxicity of DOM decreased continuously in the BiVO 4 /g-C 3 N 4 /PDS/VL coupling process. Theoretical calculations and photoelectrochemical tests suggested that the BiVO 4 /g-C 3 N 4 /PDS catalytic activity enhancement was attributed to the S-scheme mechanism and hybrid advanced oxidation process. It is expected that this work can provide new insight into DOM degradation in eutrophic lake water by the heterogeneous photocatalysis combined with the PDS activation system.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Jiangping Jing,Zhuoyuan Chen,Chang Feng,Li Ma,Jian Hou,Likun Xu,Mingxian Sun
The application of graphitic carbon nitride (g-C3N4) in the field of photoelectrochemistry is booming due to its visible light response, stability, low cost, and environmental compatibility. However, the modulation of the photogenerated charge carriers in the g-C3N4 photoelectrode is still a challenge, especially for the control of the charge transfer direction and the improvement of charge migration rate. In this work, PEDOT was in situ deposited on the surface of g-C3N4 to modify the transfer process of the photogenerated holes. The band structure was investigated based on the valence band and work function. The charge transfer properties were characterized by analyzing the processes of hole transfer, separation, and depolarization. PEDOT is found to play two roles: one is to act as a semiconductor material to form a heterojunction with g-C3N4, regulating the charge transfer direction and promoting the separation efficiency of the photogenerated charge carriers; the other one is to act as a hole transmission medium, promoting the migration and depolarization processes of the photogenerated holes. Therefore, the photoelectrochemical performance of g-C3N4 is greatly improved, which is further verified by the enhanced photoinduced cathodic protection performance, whether with the assistance of hole sacrificial agents or not.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 16
·5579-5589
·
IF 6.119
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu,Quanli Dong
Transition metal co-catalysts exhibit considerable potential in the photocatalytic water splitting process, but their limited activity and poor stability inhibit their extensive application, and therefore effective schemes are required to further enhance their co-catalytic performance. In this article, 2D/2D C3N4/CdS heterogeneous photocatalysts are first synthesized, and then CoNi alloyed NPs are selectively loaded on their CdS nanosheets by a convenient photodeposition method. The CoNi loading amount and Co/Ni ratio are adjusted by the photodeposition time and precursor Co2+/Ni2+ ratio, respectively. Meanwhile, Co–S bonds are formed between CdS and CoNi NPs. Their optimal hydrogen evolution rate can reach up to 2936.65 μmol g−1 h−1, which is higher than that of C3N4/CdS with Co, Ni or Pt as co-catalysts (i.e. 844.59, 2385.96 and 2486.66 μmol g−1 h−1), respectively. The enhanced photocatalytic performance should be due to the following three points: (1) the formation of the 2D/2D C3N4/CdS heterojunction; (2) the optimized Gibbs free energy of the CoNi co-catalysts; (3) the formation of Co–S bonds between CoNi and CdS. Our work provides a cost-effective scheme to exploit stable and efficient photocatalysts.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Hao Xu,Qian Ye,Jing Zhang,Qiansong Li,Meijing Wang,Peng Zhou,Guanyu Zhou,Qingguo Wang
In response to the inherent restriction of low Fe(II) regeneration in the Fenton process, this study demonstrated a mutual-promoting configuration, where oxygen functionalized g-C 3 N 4 (OCN) was applied in Fe(III)/H 2 O 2 system to utilize mild natural solar light (SL) for persistent Fe(II) generation. The constructed OCN/Fe(III)/H 2 O 2 /SL system exhibited strong adaptability to various pollutants, and it well outperformed the g-C 3 N 4 (GCN) modified system and the traditional Fenton system in pollutants degradation efficiency. Compared with GCN, OCN could significantly promote the Fe(II) generation under solar light (SL), leading to more efficient H 2 O 2 activation. The characterization analyses revealed the larger surface area and enhanced charge separation of OCN, which were considered to take main responsibility for its enhanced photoactivity. The complexation of Fe(III) with the carboxyl groups of OCN also benefited the Fe(II) generation. ·OH was detected as the dominant radical responsible for metronidazole (MNZ) degradation, and its production in the OCN modified system was about twice that in the GCN modified system and the Fenton system. Moreover, the precipitation of FeO x on the OCN surface benefited the charge separation of the OCN, so that the improved OCN enabled a slight enhancement of MNZ degradation in the reuse experiments. The intermediates of MNZ degradation were analyzed based on the results of LC-MS, which provided insight into MNZ degradation pathways. This work highlighted the concept of self-improving photocatalyst, the ingenious combination of photocatalysis and Fenton-like system formed a mutual-promoting situation where the OCN and the Fenton-like system could both be improved, which endowed the configuration great potential for green and economical oxidation in environmental remediation.
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高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Jinying Yu,Xiunan Cai,Xintao Zhou,Zhongqiu Luo,Fuzheng Fu,Chaochao Lai,Yanjuan Zhang,Zuqiang Huang
Efficient charge separation and controlled generation of superoxide radicals (•O 2 − ) are critical for enhancing photocatalytic activity and selectivity in the oxidation of 5-hydroxymethylfurfural (HMF) to 5-formyl-2-furancarboxylic acid (FFCA). Herein, a crystalline-amorphous S-scheme heterojunction (A-MnO 2 /B-CN) was engineered through in situ hydrothermal growth of oxygen vacancy-rich amorphous manganese dioxide (A-MnO 2 ) nanoflowers on boron-doped tubular g-C 3 N 4 (B-CN). This unique crystalline-amorphous interface establishes a strong internal electric field (IEF) that drives directional charge transfer from A-MnO 2 to B-CN. Concurrently, topological disorder within the A-MnO 2 lattice promotes dynamic O 2 adsorption and generates a robust dipole field (DF), which steers photogenerated electrons toward active sites. These dual-fields synergistically promote S-scheme charge transfer, selectively enriching •O 2 − species and suppressing •OH byproducts. Crucially, atomic-scale reconstruction at crystalline-amorphous boundaries triggers Mn 3d-O 2p orbital hybridization, reducing the rate-determining step energy barrier by 41 %. Under visible light, the system achieves near-complete HMF conversion (99.04 %) with exceptional FFCA selectivity (95.67 %) and a record production rate of 157.9 µmol·g −1 ·h −1 (3.9-fold improvement over the crystalline MnO 2 /B-CN system). This work establishes a sustainable photocatalyst design paradigm that integrates amorphous-phase defect engineering with interfacial electric field control for efficient solar-driven valorization of biomass into value-added chemicals.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xuehua Zhang,Lin Lin,Dan Qu,Jiangong Yang,Yuxiang Weng,Zhuan Wang,Zaicheng Sun,Yong Chen,Tao He
Developing highly efficient photocatalysts for solar-fuels production under visible-light irradiation is of great promise, but still remains a big challenge. In this work, we use g-C 3 N 4 incorporated with carbon dots as the photosensitizer to couple with tetra(4-carboxyphenyl)porphyrin iron(III) chloride (FeTCPP) molecular catalyst. The obtained g-C 3 N 4 -C 0.05 /FeTCPP hybrid photocatalyst exhibits high activity for the solar-fuels production of CO and H 2 under visible-light irradiation, with CO yield of 23.1 mmol/g and H 2 yield of 71.1 mmol/g in 6 h. The enhanced mechanism has been studied by various techniques like photocurrent response, photoluminescence and mid-infrared femtosecond transient absorption. The presence of trace amount of carbon dots in the system can provide an alternative channel for the electron transfer, i.e., from g-C 3 N 4 to FeTCPP via the CDs. Accordingly, the interfacial charge separation and electron transfer can be promoted, leading to enhanced photocatalytic performance of the g-C 3 N 4 -C x /FeTCPP hybrid photocatalysts.
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Advanced Energy and Sustainability Research
·
2022
·Vol. 3
·期 12
·2200138
·
IF 0
Linlin Zhang,Lu Liu,Xiaodong Zhang,Chengjun Ge,Jianjun Liao
Pharmaceuticals and personal care products (PPCPs) have attracted widespread attention due to their durability to the environment. Therefore, it is highly desirable to develop new technologies that are environmentally friendly, energy saving, and compatible to degrade these pollutants. In this study, a vis–NIR-driven and highly efficient S-scheme photocatalyst, WO 3− x /S doped g-C 3 N 4 , is used for PPCPs degradation. The results show that the photocatalytic activity of WO 3− x /S doped g-C 3 N 4 composite system for PPCPs is much higher than that of WO 3− x and g-C 3 N 4 . The introduced WO 3− x has a great positive effect on the photocatalytic performance of WO 3− x /S doped g-C 3 N 4 S-scheme composite photocatalyst for both naproxen and diclofenac. Due to the fast photogenerated carrier separation brought by the S-scheme, the WO 3− x /S-doped g-C 3 N 4 nanocomposite exhibits enhanced performance in photocatalytic PPCPs degradation. The degradation rate of naproxen is 99.2%, and the degradation rate of diclofenac can also be as high as 99.5%. This research has important reference value for the synthesis of WO 3 -based S-scheme photocatalysts for energy and environmental applications.
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MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Xiangqian Ren,Lianyan Zhu,Bin Guo,Wenting Liu,Shuang Yu,Xingfu Zhou
Ti/TiO 2 NTs/SnO 2 –Sb–Mo anode was prepared by adding intermediate layers and elemental doping and GF/Cu–C 3 N 4 cathode was prepared by impregnation method. The electrode was characterized by SEM, XRD, LSV, CV, and EIS, which show that a more uniform and finer-grained surface structure with higher electrocatalytic activity can be prepared by doping and the addition of TiO 2 -NTs interlayer. In addition, the cathode demonstrate the successful loading of Cu–C 3 N 4 on graphite felts (GFs) by SEM and EDS. The electrochemical test shows the high electrochemical activity. The high activity of the two-electrode system was verified according to the hydroxyl radical test, and then the two electrodes were applied to the degradation of 50 mg/L methylene blue wastewater at the same time, and the results showed that the degradation rate was 98.09% in 20 min, and the COD removal was as high as 80.11%, which is 1.33 times and 2.83 times of the single-anode and single-cathode systems, respectively. In addition, the system could show excellent degradation performance in a wide pH range. At the same time, the energy consumption of the two-electrode system is only 110.9 KWh/Kg. Finally, after ten consecutive decolorization experiments, the decolorization rate of methylene blue and the removal rate of COD could still reach 90.5% and 68.7% in 20 min, which indicated that the dual-electrode system had excellent reusability. The study opens a door to the practical application of electrochemical treatment of wastewater.
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高影响因子
PLANT BIOTECHNOLOGY JOURNAL
·
2025
·
IF 10.5
Xuefeng Wei,Guangjin Fan,Song Yang,Xianchao Sun,Lin Cai
Summary Delivery of exogenous nucleic acid to intact plants is a desirable but challenging technology due to the dominant transport barrier posed by the plant cell wall. Here, we found that three different morphologies of g-C 3 N 4 nanomaterials synthesized from urea can assist in the delivery of exogenous nucleic acids into mature leaf cells of Nicotiana benthamiana . Among these, g-C 3 N 4 carbon dots (CDs) showed a higher ability to deliver exogenous nucleic acid compared to nanoporous and g-C 3 N 4 nanosheets. The delivery ability of exogenous dsRNA and plasmid DNA by g-C 3 N 4 could also be restrained by stomatal closure and the endocytosis pathways in plant cells. Furthermore, the coupling of g-C 3 N 4 CDs with dsCP (CDs@dsCP), which is the dsRNA matching a specific fragment of the Coat protein -encoding gene of TMV, resulted in a superior antiviral effect compared with other morphologies of g-C 3 N 4 @dsRNAs and other loaded dsRNAs, which match Replicase , RNA-dependent Replicase or Movement protein of TMV. Significantly, a single spray of CDs@dsCP provided virus protection for at least 5 days. In addition, the g-C 3 N 4 CDs and g-C 3 N 4 CDs@dsRNA had no adverse effects on plant growth and development. Overall, our study presents a novel biocompatible and convenient tool for gene expression or gene silencing in intact plant leaves by spraying g-C 3 N 4 nanomaterials encapsulated with DNA or dsRNA, the efficiency of which is affected by the morphology of the g-C 3 N 4 nanomaterial, stomatal state and plant endocytosis pathway, and a highly promising solution for plant virus disease, which is an unsolved problem in plant disease control.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Guotong Chen,Fang Mi,Shan Zhang,Xuehui Rao,Jian Sun,Zhong Yang,Ming Guan
This study reports the design and fabrication of a magnetic nanoporous carbon-based recyclable surface-enhanced Raman scattering (SERS) substrate Co/C@Ag/g-C 3 N 4 , which can simultaneously achieve SERS detection and visible-light photocatalytic degradation of malachite green (MG). Co/C and g-C 3 N 4 can spontaneously adsorb and concentrate MG near plasmonic nanoparticles, thereby enhancing the SERS response. The substrate exhibited a SERS enhancement factor of approximately 1.3 × 10 6 . The limit of detection (LOD) for MG in aquaculture water, prawn, and tilapia was 8.2 × 10 −11 M, 0.08 μg/kg, and 0.06 μg/kg, respectively. The substrate can be magnetically collected from the complex matrix and regenerated through photocatalytic degradation. Eliminates the co-centrifugation of the SERS substrate with the complex matrix. Even after 4 regeneration cycles, the substrate retained nearly 80 % of its original SERS intensity. This study presents a novel strategy for constructing self-enriched, self-cleaning, and recyclable substrates with promising applications in food safety and environmental protection.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2026
·
IF 6.4
Bangsen Li,Yan Zhang,Xiaoxue Lin,Huaide Qin,Jianjun Shi,Zaifeng Shi
Stimuli-responsive elastomeric materials, capable of controllably and reversibly changing under external stimuli, are the key materials of intellectualized and automatic system with immense transformative application potentiality. However, it remains challenging in practice for natural rubber materials. In this research, organic solvent-responsive natural rubber (NR) films with bidirectional deformation, high stability, and excellent mechanical properties were prepared by double-layer composition and nanoparticle modification method. The bidirectional deformation of double-layer composite film (ENR/NR- g -C 3 N 4 ) with asymmetric structure consisted of an epoxy NR layer and a NR- g -C 3 N 4 composite layer. The deposition and composition of nano- g -C 3 N 4 in NR layer facilitates the rapid forward deformation of ENR/NR- g -C 3 N 4 in tetrahydrofuran. The ENR layer served as the active layer, realizing the controllable reverse deformation. The compatibility of composite films was enhanced in the procedure of direct adhesion and cross-linking interactions between ENR and NR, avoiding the appearance of phase separation. The ENR/NR- g -C 3 N 4 composite films were utilized to fabricate intelligent drive devices such as intelligent mechanical claws, artificial butterflies and bionic flowers, exhibiting rapid, sensitive and controllable stimuli-responsiveness. This study provides a novel synthetic strategy for the design of intelligent NR materials and rises to the existing challenges in the field of intelligent and responsive natural rubber materials.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon
Visible-light-driven photocatalytic Fuel Cell (PFC) is of great interest in the environmental pollutant remediation with energy recovering. Herein, enhancement in photocatalytic degradation of Tetracycline Hydrochloride (TC) with electricity generation was achieved in a single reactor of PFC with paired stainless-steel mesh electrode loaded with anodic g-C 3 N 4 /Fe 0 (1%)/TiO 2 and cathodic WO 3 catalyst (at various pH, 0.05 M Na 2 SO 4 , 10 Ω external resistance) with visible light and without light. With light, TC molecules were successfully removed (97.3% in 90 min, at initial and optimal pH 5), while generating 0.98 V cell voltage and 24 W m −2 power density, simultaneous removal of COD (chemical oxygen demand) and TOC (total organic carbon) was 91.3% and 95%, respectively, suggesting superior mineralization that can be explained by the excitation of the anodic triple component g-C 3 N 4 /Fe 0 (1%)/TiO 2. In contrast, without light, the removal of COD, TOC and the cell voltage were much lower (48.8%, 65.3%, 0.78 V). In dark, the fuel cell is self-driven and self-biased, forming potential gradient and degrading pollutants. The effects of solution pH, initial TC concentration on degradation and power generation were evaluated. This PFC degrading TC can maintain high photocatalytic activity and high power output capacity after 5 cycles with light. Without light, the electricity generation capacity was 50–70% that in visible light PFC. These features reveal that fuel cell with g-C 3 N 4 /Fe 0 (1%)/TiO 2 photo anode and WO 3 photocathode has great application potential for removing refractory pollutants from wastewater.
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