JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Haohuan Yuan,Wenting Xiao,Xin Zhang,Jiao Bao,Wei Li,Bo Huang,Guannan He
Efficient carrier separation and high electron migration efficiency are essential for sustainable H 2 energy production via photocatalysis . In this work, a Mn 0.5 Cd 0.5 S/Ti 3 C 2 MXene/g-C 3 N 4 all-solid-state Z-scheme photocatalyst is constructed by a series of processes, including low temperature calcination , etching, ultrasonication and solvothermal process. The appropriate energy band structures of g-C 3 N 4 and Mn 0.5 Cd 0.5 S enable the formation of the Z-scheme system, achieving efficient carrier separation. The Ti 3 C 2 MXene flakes assembled between g-C 3 N 4 nanosheets and Mn 0.5 Cd 0.5 S particles can accelerate the charge migration rate in the system. The optimized ternary composite exhibits the highest hydrogen evolution rate (HER) of 13.7 mmol g −1 h −1 , which is much higher than that of the pure g-C 3 N 4 and Mn 0.5 Cd 0.5 S. Meanwhile, the apparent quantum yield (AQY) value of the composite at 420 nm reaches up to 24.07 % and exhibits high stability. Based on the characterization, the photocatalytic mechanism of carrier transfer in the Z-scheme heterojunction is also revealed. The finding of this article provides insights into the high efficiency of carrier transfer and separation in the photocatalytic reactions.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zengkai Song,Chunpei Yan,Jialin Qiu,Chao Liu,Ye'an Zhu,Bo Wang,Zongbo Xie,Guo Chen,Kangqiang Li,Zhanggao Le
Graphitic carbon nitride (g-C 3 N 4 ) has garnered significant attention in the realm of photocatalytic reduction of U(Ⅵ) from aqueous solutions owing to its favorable bandgap and visible light responsiveness. Nevertheless, conventionally prepared bulk g-C 3 N 4 suffers from limitations such as a small specific surface area and high recombination of photo-generated charges, consequently impeding the efficiency of photocatalytic reactions and hampering practical applications. To address these shortcomings, this study presents a novel approach wherein ultra-thin porous g-C 3 N 4 nanosheets were successfully synthesized through the microwave-assisted calcination of urea in a single step. The resulting g-C 3 N 4 nanosheets exhibit a multi-hollow mesh structure with a significantly enlarged specific surface area, the specific surface area and pore size of MCN 90 are 170 m²/g and 17 nm, respectively, which are 2.3 times and 8 times that of the bulk g-C 3 N 4 . Photocatalytic experiments revealed that these ultra-thin porous nanosheets demonstrate superior performance in the reduction of U(Ⅵ) to U(Ⅳ), achieving a reduction rate of 100 % within 20 minutes for the optimal sample, as opposed to 78 % in 40 minutes for bulk g-C 3 N 4 . This enhanced photocatalytic activity can be primarily attributed to the unique ultra-thin porous nanosheet structure, which facilitates increased specific surface areas, improve photoelectric properties, and substantially shortened electron migration distances which reduce the recombination efficiency of photogenerated electrons and holes pairs. Consequently, these findings not only offer insights into the optimization of g-C 3 N 4 for U(Ⅵ) reduction but also provide a valuable reference for the preparation of other two-dimensional ultra-thin porous materials aimed at similar applications.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Chong Wan,Yushu Xiong,Honghong Qin,Zhao Qin,Suhang Chen,Kangzhen Xu
Nanothermites are presenting competitive advantage potential in military and civilian applications, but high electrostatic discharge (ESD) sensitivity severely hinders their preparation, storage and usage. Aiming to improve the safety and combustion properties of energetic materials (EMs), the two-dimensional semiconductor materials graphite carbon nitride (g-C 3 N 4 also abbreviated as CN) was inserted into the Al/CuO mixture via the one-step sol-freeze-drying method. The successful preparation of samples was confirmed by morphological and chemical bond characterization. Then DFT calculation and BET tests prove that more active sites exist in reaction interface, and the adsorption between Al atoms and CuO unit cells are easier due to polyvinylpyrrolidone (PVP) and g-C 3 N 4 functioning, thereby improving the combustion of Al/CuO and ESD safety. The Al/CuO/CN nanocomposite with 2.5 wt% CN has an ESD ignition threshold of 3.2 mJ and realizes maximal reaction energy and constant volume heat of combustion ( Q v ) of 1400.4 J·g −1 and 5896 J·g −1 , respectively. As the CN content grows to 10.0 wt%, the ESD ignition threshold keeps decreasing to 8.45 mJ. Additionally, PVP and CN show superior advantages in regulating the combustion of Al/CuO, and the possible effect mechanism is investigated. This work will provide a fresh strategy for extending applications of nanothermites.
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Molecular Catalysis
·
2024
·
IF 3.9
Zheng Zhou,Meng Miao,Wenzhi Li,Jingting Jin,Liqun Wang,Lulu Zhang,Liang Yuan
The selective conversion of methane is a significant but difficult challenge. We reported a CuFe bimetallic catalyst supported by g-C 3 N 4 for the catalytic oxidation of methane to oxygenated C1 products. Using H 2 O 2 as the oxidant, Cu 0.4 Fe 0.3 -C 3 N 4 catalyst had a C1 yield of 8231 μmol·g cat −1 · h −1 at 70 °C, and 1 H NMR results showed that almost all of the liquid phase products were target C1 products. The methanol selectivity on CuFe-C 3 N 4 was 44.5 %, comparing with 20.2 % methanol selectivity on Cu-C 3 N 4 . The formation of a Cu-O-Fe site on the CuFe-C 3 N 4 was confirmed by in situ DRIFTS and 57 Fe Mössbauer spectroscopy. This Cu-O-Fe site was responsible for the improved catalyst performance. DFT calculations illustrated that at the Cu-O-Fe site, H 2 O 2 dissociated into two ·OH radicals instead of ·H and ·OOH radicals as it did at the Cu-O-Cu site. The ·OH radicals combined with the ·CH 3 radicals from the CH 4 molecules to form methanol. These findings provided valuable insights into the rational design of active sites on carbon nitride materials.
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ChemistrySelect
·
2024
·Vol. 9
·期 48
·e202400718
·
IF 1.9
Qingbo Yu,Yuqi Li,Qingping Wang,Naishen Shi,Fan Liu,Zishe Xu
Graphical The fly ash was treated with Ca(OH) 2 lead to a more complex surface structure. It can regulate the polymerization reaction of dicyandiamide, leading to the formation of the CaFA-CN catalyst with more amino groups and fewer carbon–nitrogen heterocycles. The photocatalytic activity of the obtained CaFA-CN is 4.03 times higher than that of the original g-C 3 N 4 . Regulating the polymerization of graphitic carbon nitride (g-C 3 N 4 ) precursor is regarded as a desirable pathway to boost its photocatalytic activity. However, the current has been seldomly concerned in adjusting the polymerization of g-C 3 N 4 precursor based on the structural characteristics of fly ash (FA). This study manipulates the polymerization reaction of dicyandiamide through alkali treatment of fly ash (KOH-FA, CaOH-FA and NaOH-FA), yielding three g-C 3 N 4 -based composite photocatalysts (CaFA-CN, KFA-CN, and NaFA-CN) with varying degrees of polymerization. Compared to the zeolite structures of fly ash treated with potassium hydroxide (KOH) and sodium hydroxide (NaOH), the fly ash treated with calcium hydroxide (Ca(OH) 2 ) developed calcium silicate hydrate, leading to a more complex surface structure. Isotherm adsorption model analysis revealed that Ca(OH) 2 -FA's adsorption of methylene blue fits the Freundlich model, indicating uneven distribution of active sites. This unevenness results in an uneven collision probability during the high-temperature polymerization of dicyandiamide, leading to incomplete polymerization and the formation of the CaFA-CN catalyst with more amino groups and fewer carbon-nitrogen heterocycles. This incomplete polymerization enabled CaFA-CN to achieve a 55.3% degradation efficiency of methylene blue within 60 minutes. The photocatalytic activity of CaFA-CN is 4.03 times that of the original g-C 3 N 4 (19.4%).
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ENERGY & FUELS
·
2024
·
IF 5.2
Dechao Wang,Lin Chen,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Rong Chen,Qiang Liao
Development of a highly performing heterojunction photoanode is significantly important for photoelectrochemical cells. Herein, a novel strategy is proposed to construct a protonated g-C3N4 nanosheets/nitrogen-doped TiO2 photoanode inspired by polydopamine microspheres. The polydopamine microspheres can enhance the adsorption of protonated g-C3N4 nanosheets via electrostatic interaction, facilitating heterojunction formation. Moreover, the addition of the polydopamine microspheres into the preparation process can not only dope a nitrogen element into TiO2, improving solar energy utilization, but also create a vigorous pore structure in the photoanode, promoting mass transport and light scattering. Besides, the specific surface area can also be increased. Owing to these merits, the photoelectrochemical activity of this newly developed photoanode is greatly improved. Furthermore, the superiority of this photoanode is evaluated by integrating it into a photoelectrochemical cell for simultaneous wastewater treatment and power generation. The maximum power density generated by the newly developed protonated g-C3N4 nanosheets/nitrogen-doped TiO2 photoanode is about 138.5% and 40.9% higher than the TiO2 photoanode and the protonated g-C3N4 nanosheets/TiO2 photoanode prepared without using the polydopamine microspheres, respectively. The present study provides a novel strategy for developing a highly performing heterojunction photoanode.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 47
·e56261
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IF 2.7
Jiayu Lin,Yongbo Hou,Lailong Ding,Yifan Wang,Jinhu Hu,Xishun Qiu,Chao Wu,Mingliang Ma,Wei Gao
Metal–organic frameworks (MOFs) have garnered significant attention in recent years due to their potential application in flame-retardant polymeric materials. In this work, Fe 2 O 3 /ZnFe 2 O 4 /g-C 3 N 4 @ZIF-8 flame retardants were synthesized via solvothermal and calcination techniques, and their elemental composition and morphologies were thoroughly characterized. The flame retardancy of polyurea (PUA) composites incorporating varying dosages of these flame retardants was evaluated using cone calorimetry tests (CCT). The findings demonstrate that the incorporation of Fe 2 O 3 /ZnFe 2 O 4 /g-C 3 N 4 @ZIF-8 significantly enhanced the flame retardant properties of PUA composites. With the addition of 3 wt% of the flame retardant, the peak heat release rate (PHRR), total heat release (THR), total smoke production (TSP), and total CO yield (TCO) of the PUA composites decreased to 890.82 kW/m 2 , 131.34 MJ/m 2 , 12.30 m 2 , and 2.39 g, respectively, reflecting reductions of 33.59%, 18.59%, 29.40%, and 47.93% compared with pure PUA. The flame-retardant mechanism was systematically analyzed in both the condensed and gas phases. This study provides a robust experimental foundation and novel insights that contribute to the development of advanced flame-retardant coating materials.
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Reaction Chemistry & Engineering
·
2024
·
IF 3.4
Xinyue Zhang,Lin Yuan,Yu Zhang,Xinyu Shu,Renjie Li,Qunfen Deng,Zilong Zhang,Rui Yang
In this work, a modified graphite phase carbon nitride (g-C3N4), used as an efficient photocatalyst, was successfully prepared by employing melamine as a precursor and ammonium chloride as a gas template agent, in conjunction with a two-step calcination strategy to manipulate the polymerization process of melamine. The relevant characterization results indicated that the modified catalyst had loose structure and more active sites, which increased the specific surface area, inhibited the recombination of light-generated electron–hole pairs, and then promoted the generation of active substances. The photocatalytic performance of the catalyst was evaluated using rhodamine B (RhB) as a template under visible light irradiation. The results demonstrated that the secondary calcination temperature significantly influenced the performance of the catalyst. At the optimum secondary calcination temperature (∼650 °C, denoted as 650-CN-2), the reaction rate constant was estimated to be 0.1163 min−1, which was 30.4 and 2.71 times higher than that of pure CN and CN-2, respectively, while achieving a degradation rate of 97% within 30 min. Radical trapping experiments and ESR analysis confirmed that the superoxide free radical (·O2−) serves as the primary active species in photocatalytic degradation. This work not only expanded research ideas for the optimal temperature of the secondary calcination method, but also provided a useful exploration for the efficient synthesis path of catalysts.
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Water Research X
·
2025
·
IF 8.2
Hong Tu,Bihong Tian,Zhichao Zhao,Renjiang Guo,Ya Wang,Shunhong Chen,Jian Wu
The structural modulation of pristine graphitic carbon nitride poses a considerable challenge in the rational design of catalysts for the efficient degradation of small organic pollutants under visible light. In this study, we combined first-principles calculations and the structure-function relationship to predict a high-performance catalyst. The results reveal that CN-8 demonstrates a remarkable degree of electron-hole separation. Notably, CN-8 shows exceptional degradation efficiency towards rhodamine B, tetracycline, bisphenol A, and fluralaner under visible light irradiation. Specifically, the degradation rate constants are 11, 4, 12, and 32 times higher, respectively, compared to bulk g-C 3 N 4 . Through density functional theory calculations and investigations of the structure-function relationship, it is confirmed that the superior catalytic activity of CN-8 lies in modifying the amino position, which alters the electron cloud distribution and promotes the efficient separation of photo-generated electron-hole pairs. This study provides valuable insights for the development of eco-friendly and efficient photocatalysts for environmental remediation.
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PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Ran Yu,Liying Pu,Xiaofang Wang,Peng Liu,Xiang Shen
The eco-friendly nature and energy efficiency of polymeric membranes have established them as pivotal materials for oil-in-water emulsion separation. However, persistent membrane fouling caused by oil deposition remains a major challenge, significantly hindering their practical implementation in industrial settings. In this work, thiol–ene photochemistry was employed to synthesize PEGylated silica nanoparticles (SiO2-g-PEGDA) using poly(ethylene glycol) diacrylate (PEGDA) and hexanedithiol (HD) as monomers. Biomimetic PVDF membranes were engineered via vapor-induced phase separation (VIPS) by integrating SiO2-g-PEGDA nanoparticles, followed by secondary coagulation in a dopamine (DA) solution. The experimental results demonstrate that the biomimetic membranes exhibit a characteristic sponge-like cross-sectional morphology and well-defined rough surface microstructures, which are attributed to the synergistic roles of SiO2-g-PEGDA as nanofillers and DA as interfacial cross-linker during secondary phase separation. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) analyses confirm that the combined action of nanoparticles and PDA significantly increases the density of hydrophilic functional groups on membrane surfaces and within pore channels. The membranes exhibit excellent hydrophilicity and underwater superoleophobicity, achieving an outstanding emulsion flux of 3537 Lm–2 h–1 bar–1 and an oil removal efficiency of 98.5%. After 15 cycles of oil–water separation, the membranes maintain a high flux recovery rate of 85.6%. Moreover, the biomimetic membranes possess exceptional operational stability, as evidenced by consistent surface wettability under organic solvents, strong acid and high-salinity conditions.
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高影响因子
ELECTROANALYSIS
·
2025
·Vol. 37
·期 7
·e70023
·
IF 2.3
Dongxue Sun,Shijie Chen,Jinlong Li,Guozhe Sui,Dongxuan Guo,Ning Liu,Renjiang Lv,Shuang Sui
In this study, ZnO/ZnS/g-C 3 N 4 composite materials were successfully synthesized via a combination of hydrothermal treatment and calcination for the electrochemical detection of ascorbic acid (AA). A systematic experimental design was implemented to evaluate the influence of key parameters, including the amount of ZnS added, the loading ratio of ZnO/ZnS onto g-C 3 N 4 , and the pH conditions during detection, on sensor performance. Comprehensive material characterization was conducted using scanning electron microscopy transmission electron microscopy X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy, providing detailed insights into the composites’ microstructure, crystallinity, elemental composition, and chemical bonding. The sensor exhibited excellent performance for AA detection, with a broad linear detection range of 20–5000 μM, a low detection limit of 1.2 μmol/L (S/N = 3), and high recovery rates between 98.23% and 105.02%, accompanied by low relative standard deviations (1.56–3.12%). Furthermore, application of the sensor in cyclic voltammetry analysis of commercial vitamin C tablets yielded accurate and reliable results, confirming its strong stability, anti-interference capacity, and reproducibility.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
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.
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