Science of Advanced Materials
·
2014
·Vol. 6
·期 6
·1091-1098
·
IF 2.908
Chen Lu-Ya,Zhang Wei-De
Composite photocatalysts based on graphite-like carbon nitride (g-C3N4) and SnO2 nanoparticles were prepared by heating a mixture of SnO2 nanoparticles and melamine in a muffle furnace. The as-synthesized samples were characterized by X-ray
diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible light absorbance spectra, FT-IR and TG analyses. The kinetic constant over an optimized nanocomposite catalyst was 1.37 h–1, which was 4.54 times higher than that over the pristine
g-C3N4 towards the decomposition of rhodamine B under visible light. The significantly higher photocatalytic activity of the composite photocatalysts was attributed to the enhancement of electron–hole separation at the interface between g-C3N4
and SnO2.
研究领域:
材料科学
·
光催化
·
纳米技术
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Polymers
·
2023
·Vol. 15
·期 9
·2006
·
IF 5
Kewei Shu,Jiazhen Zhou,Xiaojing Wu,Xuan Liu,Liyu Sun,Yu Wang,Siyu Tian,Huizhu Niu,Yihao Duan,Guangyu Hu,Haihua Wang
As one of the most promising candidates for all-solid-state sodium-ion batteries and sodium-metal batteries, polyvinylidene difluoride (PVDF) and amorphous hexafluoropropylene (HFP) copolymerized polymer solid electrolytes still suffer from a relatively low room temperature ionic conductivity. To modify the properties of PVDF-HEP copolymer electrolytes, we introduce the graphitic C3N4(g−C3N4) nanosheets as a novel nanofiller to form g−C3N4composite solid polymer electrolytes (CSPEs). The analysis shows that the g−C3N4filler can not only modify the structure in g−C3N4CSPEs by reducing the crystallinity, compared to the PVDF−HFP solid polymer electrolytes (SPEs), but also promote a further dissociation with the sodium salt through interaction between the surface atoms of the g−C3N4and the sodium salt. As a result, enhanced electrical properties such as ionic conductivity, Na+transference number, mechanical properties and thermal stability of the composite electrolyte can be observed. In particular, a low Na deposition/dissolution overpotential of about 100 mV at a current density of 1 mA cm−2was found after 160 cycles with the incorporation of g−C3N4. By applying the g−C3N4CSPEs in the sodium-metal battery with Na3V2(PO4)3cathode, the coin cell battery exhibits a lower polarization voltage at 90 mV, and a stable reversible capacity of 93 mAh g−1after 200 cycles at 1 C.
研究领域:
材料科学
·
储能技术
·
电化学
·
聚合物纳米复合材料
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122346
·
IF 7.5
Xiaolong Zhang,Haowen Zhuang,Chenxuan Shao,Chen Wang,Xiaohui Ju,Qi Zhang,Yujia Tong,Weixing Li
Although membrane separation technology has been widely used for oily wastewater treatment in recent years, surface fouling still poses a great threat to application. Due to the strong adsorption of oil droplets onto membrane surface and within pores, pristine membranes are inadequate for long-term oil-water separation applications. Here, a novel photocatalytic nanofiber membrane via microchip grafting with in-situ mineralization was proposed. N-Methylolacrylamide (NMA) was successfully grafted on polyvinylidene fluoride (PVDF) by microfluidic electrospinning, and the grafting amount was 9 times that under conventional bottle reaction conditions. The in-situ mineralization time via the polyphenol-metal network was reduced from 27 h to 18 h, while the mineralization rate increased by threefold compared with the bottle-grafted membrane. For oil-water emulsion separation, the developed PVDF-g-NMA@FeOOH membrane successfully showed the high permeability of 38870 L·m −2 ·h −1 ·bar −1 with the outstanding rejection rate of 99.2%. It displayed great photocatalytic self-cleaning performance, and the flux recovery rate was up to 95.8% after cycle tests. Methhyllene blue (MB) removal rate reached 96.3% in 50 min. The developed membrane holds great promise for applications in oil-water separation and organic contaminant degradation.
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PLoS One
·
2025
·Vol. 20
·期 10
·e0333967
·
IF 2.6
Yanjin Wang,Zhuo Zhang,Lin Shi,Lidong Kou,Yasong Li
With the extensive use of antibiotics around the world, their contamination problem has now attracted increasing attention, and seeking effective antibiotic contamination management technologies has been imminent. Visible light photocatalytic technology, as an emerging green technology with low cost, high efficiency and good application prospect, has become a research focus both at home and abroad. In this paper, graphitic phase carbon nitride (g-C 3 N 4 ) was used as a photocatalytic material, and the composite photocatalysts g-C 3 N 4 /MoS 2 , g-C 3 N 4 /CuS, g-C 3 N 4 /CdS were produced by compounding it with a series of metal sulfides, and the physical and chemical properties of the composite photocatalysts were characterized by means of SEM, TEM, BET, XRD, XPS, FT-IR, and UV-VIS-NIR. The results show that the prepared composite photocatalytic materials do not change the morphological structure of g-C 3 N 4 , and the introduction of metal sulfides can effectively enhance the light absorption performance and photocatalytic activity of the composites. The best removal of typical antibiotic sulfadimethylpyrimidine (SMT) in water was achieved by g-C 3 N 4 /CdS, with the most stable photocatalytic performance, and the complete removal of SMT could be achieved after 6 h of photocatalysis under LED illumination conditions at wavelengths of 420 nm and 365 nm. g-C 3 N 4 /CdS had the highest photocatalytic activity at pH = 3. Optimal g-C 3 N 4 /CdS was used to prepare flexible polyacrylonitrile carrying carbon nitride nanofiber photocatalysts (PAN/g-C 3 N 4 /CdS) by electrostatic spinning method, which had excellent light absorption properties in UV and visible light regions. SMT removal of PAN/g-C 3 N 4 /CdS reached 100.00% after the light was turned on for 6 h at a wavelength of 365 nm, indicating that the nanofiber photocatalytic materials prepared in this study have excellent photocatalytic activity and antibiotic degradation performance. This paper has important theoretical and practical significance for solving the problem of antibiotic pollution in water bodies.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xuejiao Wang,Jiayi Dai,Xueyan Liu,Yang Liu,Yufeng Tao,Erjin Zhang
Noble metal@functional material composites are a promising SERS platform that can overcome the limitations of traditional noble metal-only substrate, achieving the enhancement of SERS performance and the expansion of functionalities. Aiming to obtain high-performance composite SERS substrate, herein, the Ag nanoflowers (NFs)@g-C 3 N 4 hybrid was synthesized by a facile method. The prepared Ag NFs@g-C 3 N 4 substrate achieved highly sensitive SERS detection towards crystal violet with a detection limit down to 10 −11 M. At the same time, a relative standard deviation of less than 15 % for the SERS signal illustrates the satisfactory homogeneity of the obtained substrate. The remarkable SERS activity was attributed to the plasmonic enhancement from Ag NFs and the molecular adsorption capability from g-C 3 N 4 . When employing the Ag NFs@g-C 3 N 4 substrate to detect antibacterial residues in river water, the experimental results show that the detection limits for malachite green and methylene blue are 10 −6 M. This work develops a sensitive nanocomposite SERS substrate for trace molecules detection.
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DYES AND PIGMENTS
·
2026
·
IF 3.9
Zhiling Qiu,Ziyi Yan,Zhangjian Qian,Huimin Zhang,Yucheng Pan,Nan Jiang,Shangyun Wang,Li Na,Xin Xiao
A facile one-pot synthesis of g-C 3 N 4 /ZnO heterojunctions is reported for water remediation. The optimal composite (3:7 mass ratio) achieves enhanced visible-light degradation of methylene blue (k = 0.02033 min -1 ), attributed to interfacial charge separation rather than adsorption, as evidenced by PL and photocurrent measurements. Radical trapping and LC-MS identify •OH and h + as dominant species and reveal a stepwise demethylation degradation pathway. DFT calculations verify a type-II band alignment with a built-in electric field that thermodynamically drives carrier separation. The composite maintains excellent stability over multiple cycles, highlighting its potential for practical photocatalytic applications.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Ning Li,Yihui Qi,Shujie Zang,Tingna Shao,Jiaojiao Gao,Lina Lin,Yu Zhao
A novel TiO 2 –g-C 3 N 4 –BiOI (TCB) dual-heterojunction nanocomposite with a hierarchical nanoflower morphology was synthesized via a combined hydrothermal–calcination method. The TCB-2 sample, which contained 2.4% Bi, exhibited exceptional photocatalytic activity for methyl orange degradation, achieving 98.55% removal under xenon-lamp irradiation within 100 min. SEM characterization revealed a nanoflower architecture composed of interlaced nanosheets with abundant interspaces, providing increased active sites and facilitating reactant diffusion. UV–Vis DRS analysis confirmed the narrowed optical band gap and extended visible-light absorption range. The formation of intimate contact between components, which is a prerequisite for heterojunctions, was supported by XRD and XPS analyses, suggesting the possible establishment of dual heterojunctions (Type II and p-n). The catalyst maintained an 82.80% degradation efficiency after three cycles, demonstrating excellent stability. This work provides valuable insights for designing TiO 2 -based photocatalysts with enhanced visible-light utilization for environmental applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Yi Li,Yanan Li,Shuanglong Ma,Pengfei Wang,Qianlei Hou,Jingjing Han,Sihui Zhan
Ag 2 WO 4 /g-C 3 N 4 composite photocatalyst was synthesized by polymerization of thiourea and ammonia chloride combined with the deposition-precipitation method, which was applied as an efficient visible-light driven photocatalyst for inactivating Escherichia coli ( E. coli ). The physicochemical properties of these photocatalysts were systematically characterized by various techniques such as SEM, TEM, XRD, FT-IR, BET, UV–vis DRS and PL. The synthesized photocatalysts exhibited outstandingly enhanced photocatalytic disinfection efficiency compared with that of pure g-C 3 N 4 and Ag 2 WO 4 under visible light. Furthermore, the optimal mass ratio of the Ag 2 WO 4 to g-C 3 N 4 was 5 wt%, and a number of live bacteria could be completely inactivated with Ag 2 WO 4 (5%)/g-C 3 N 4 (100 μg/mL) after 90 min under visible light irradiation. The high disinfection efficiency is due to the synergetic effect between g-C 3 N 4 and Ag 2 WO 4 , including a good distribution of Ag 2 WO 4 particles on the surface of g-C 3 N 4 and an improved separation rate of photogenerated electron-hole pairs. The enhanced disinfection mechanism was also investigated using photogenerated current densities and electrochemical impedance spectroscopy (EIS). Considering the bulk availability and excellent disinfection activity of Ag 2 WO 4 /g-C 3 N 4 composite, it is a promising solar-driven photocatalyst for cleaning the microbial contaminated water.
研究领域:
环境科学
·
材料科学
·
光催化
·
水处理
·
纳米技术
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Bioengineering & Translational Medicine
·
2022
·Vol. 8
·期 2
·e10402
·
IF 10.684
Shixi Zhang,Yuqing Pan,Zhiyuan Mao,Jiahui Zhang,Kunxi Zhang,Jingbo Yin,Chen Wang
Diabetic patients are prone to developing chronic inflammation after trauma and have persistent nonhealing wounds. Reactive oxygen species (ROS) and recurrent bacterial infections at the site of long-term wounds also further delay skin wound healing and tissue regeneration. In this study, a granular gel (which exhibits ROS scavenging and antibacterial properties) is fabricated based on hyaluronic acid- g -lipoic acid (HA-LA). Briefly, HA-LA is synthesized to fabricate HA-LA microgels, which are further assembled by Ag + via its coordination effect with disulfide in dithiolane to form a granular gel. The extrudable bulk granular gel possesses a shear-thinning feature and is immediately restored to a solid state after extrusion, and this can be easily applied to the whole wound area. Therefore, the grafted LA not only allows for the construction of the granular gel but also removes excess ROS from the microenvironment. Additionally, the presence of Ag + realizes the assembly of microgels and has antibacterial effects. In vivo experiments show that the HA-LA granular gel eliminates excessive ROS at the wound site and up-regulates the secretion of reparative growth factors, thus, accelerating common and diabetic wound healing significantly. Therefore, the ROS-scavenging granular gel that can be applied to the wound surface with chronic inflammation demonstrates strong clinical utility.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanan Liu,Lingchang Jiang,Yuyang Tian,Zhifeng Xu,Wenting Wang,Ming Qiu,Hongmei Wang,Xi Li,Guangshan Zhu,Yangang Wang
Photocatalytic water splitting into H2 is the most economic and environmentally friendly strategy for H2 production, and rationally constructing a heterojunction retains enormous influence on a photocatalytic system. Herein, 2D/2D covalent organic framework/graphitic carbon nitride (COF/CN) van der Waals heterojunctions were readily prepared via an ultrasonic method for high-efficiency visible-light photocatalytic H2 production. The photocatalytic H2 production performance of optimized COF/CN composites can reach up to 449.64 μmol·h–1, which is approximately 5 times that of pure CN (89.08 μmol·h–1). The characterization and experimental studies reveal that the synergistic effect between COF and CN contributes to promoting the interfacial migration and spatial separation of photoinduced e––h+ pairs, further boosting the photocatalytic hydrogen production activity. This work may open a new window to design and fabricate effective heterojunction photocatalysts for photocatalytic energy conversion.
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ChemistrySelect
·
2022
·Vol. 7
·期 40
·e202203024
·
IF 2.307
Xuehui You,Fang Liu,Guofei Jiang,Shuhua Chen,Beiya An,Rongli Cui
Graphical Degradation experiments of TC suggested that SCN/NT-2@PTFE composites showed the best photocatalytic performance under the optimal conditions, the degradation rate of tetracycline reached 99 % after 120 min of irradiation. The preparation of SCN/NT-2@PTFE composite membrane can solve the problem of difficult recovery and secondary contamination of powder catalysts. Herein we synthesized S-g-C 3 N 4 and N−TiO 2 catalysts by hydrothermal and calcination technologies and SCN/NT@PTFE membrane by a vacuum filtration method. The morphology and composition of the synthesized materials were analyzed by different characterization methods (SEM/HRTEM/XRD/XPS/UV-vis et.). The effects of different catalysts, pollutant concentrations, mass of catalyst and pH on the photo-degradation of tetracycline were investigated. The degradation rate of tetracycline by SCN/NT-2@PTFE membrane was as high as 99.9 % after 2 h of illumination. This was mainly because heterogeneous structure between S-g-C 3 N 4 and N−TiO 2 broadened the light absorption range and suppressed the carrier complex. Superoxide radicals (⋅O 2 − ) were proved to play a dominant role in the degradation reaction. After 20 days of stirring in water, the photocatalytic performance of membrane decreased slightly, demonstrating its good stability. The study of SCN/NT-2@PTFE membrane provides a new direction for the development of photocatalysis and membrane.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Chao Zhao,Wanlu Sun,Baojin Tan,Dan Su,Yi Liu
The antibiotic therapy usually leads to the bacterial resistance, and the traditional photosensitizer was in “always on” state with damage to normal tissue. Fortunately, the activatable near-infrared photosensitizer has a high depth of tissue penetration, and can be specifically released with low side effect. Therefore, we designed and synthesized a penicillin G acylase (PGA) activable photosensitizer (NFh-PGA), which could be activated to produce NFh-OH. NFh-OH can product singlet oxygen ( 1 O 2 ) under near-infrared light 730 nm excitation, and have an excellent antibacterial effect in vitro and in vivo . The probe accelerates the healing of bacterial infection wounds by near-infrared imaging guiding PDT. This work provides a strategy for the integrated design of diagnosis and treatment of bacterial infection.
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