MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Zhilin Li,Chongyue Jin,Chunmei Lv,Min Wang,Jin Kang,Shiyu Liu,Yuanhua Xie,Tong zhu
To further promote the visible-light photocatalytic efficiency of Bi 24 O 31 Cl 10 , g-C 3 N 4 /Eu(III) doped Bi 24 O 31 Cl 10 heterojunction composites (CN/Eu-BCO) were successfully synthesized via modified solution combustion and immersion-calcination method. The effects of Eu(III) dopants and g-C 3 N 4 coupling on the micro-structures and the photocatalytic efficiency of Bi 24 O 31 Cl 10 towards Rhodamine B (RhB) degradation were investigated in detail. The results displayed that Eu(III) doping and coupling with g-C 3 N 4 can largely promote the photocatalytic efficiency of Bi 24 O 31 Cl 10 . The photodegradation rate of RhB over 5CN/0.01Eu-BCO can reach to be 91.9% in 40 min, which was 8.46 folds of Bi 24 O 31 Cl 10 , 1.91 folds of 0.01Eu-BCO, and 1.72 folds of 5CN/BCO. The main radical species being responsible for RhB degradation were ● O 2 − and ● OH. Furthermore, 5CN/0.01Eu-BCO composite photocatalyst exhibited good reusability and stability.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Rong Wang,Xiangyu Kong,Wentao Zhang,Wenxin Zhu,Lunjie Huang,Jing Wang,Xu Zhang,Xinnan Liu,Na Hu,Yourui Suo,Jianlong Wang
Photocatalytic disinfection, which is a readily reliable method in most climates, holds great promise to significantly reduce the microbial contamination in modern industry. Here we report that vanadate quantum dots-interspersed graphitic carbon nitride (vanadate QDs/g-C 3 N 4 ) can achieve efficient inactivation of Salmonella by harvesting a substantial visible light. Detailed characterization through SEM-EDS, TEM, XRD, FT-IR, and XPS confirmed the formation of the composites. Owing to the efficient reactive oxygen species (ROS) production between vanadate QDs and g-C 3 N 4 , the bactericidal efficiency of AgVO 3 QDs/g-C 3 N 4 could reach 96.4% toward Salmonella in a concentration of 0.75 mg/mL after 10 min visible-light illumination. More importantly, scavenger experiments of different reactive species proved that the photoinduced electron generated at the oxidation site of AgVO 3 /g-C 3 N 4 play a major role as oxidative species. Fluorescent-based cell live/dead test and membrane potentials were applied to demonstrate the integrity of cell membranes. Furthermore, the SEM technology, PCR and BCA protein assay were employed to verify the bacterial decomposition as well as leakage of bacterial cell contents toward Salmonella . Sterilization experiments of Staphylococcus aureus revealed that our composites have broad spectrum antimicrobial activity for both Gram-negative and Gram-positive bacteria under visible light. The results showed that the generation of high ROS could attack the bacterial cells membrane, and ultimately disrupt the cell metabolism through bacterial contents, which provided a feasible method for eliminating the microbial contaminated water.
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ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Yujuan Xu,Wu Lei,Juan Su,Jinjin Hu,Xiaodan Yu,Tong Zhou,Yun Yang,Daniel Mandler,Qingli Hao
A fast, ultrasensitive electrochemical sensing platform based on graphitic carbon nitride-electrochemically deposited-poly(3,4-ethylenedioxythiophene) (g-C 3 N 4 -E-PEDOT) composite was constructed by in-situ electropolymerization and applied for the quantitative determination of acetaminophen (AP). E-PEDOT was introduced as the conducting matrix for developing g-C 3 N 4 composite to complement the poor conductivity disadvantage of g-C 3 N 4 . The strong affinity and synergetic effect between g-C 3 N 4 and E-PEDOT, which were analyzed by PM6 computational calculation, highly improved the electron transfer property and remarkably enhanced the electrochemical catalytic activity of the composite. The g-C 3 N 4 -E-PEDOT modified glassy carbon electrode (GCE) demonstrated better electrocatalytic activity towards the oxidation of AP than bare, g-C 3 N 4 and E-PEDOT modified ones. Under the optimized conditions, the oxidation peak currents at the g-C 3 N 4 -E-PEDOT/GCE increased linearly in the concentration range of AP from 0.01 to 2 μM and 2–100 μM, and an ultra-low limit of detection (LOD) of 34.28 nM was obtained (S/N = 3). In addition, the g-C 3 N 4 -E-PEDOT/GCE was successfully applied for the AP determination in the clinical human serum, and also exhibited excellent selectivity, reproducibility and stability. Except the novel AP determination approach, moreover, this work provided a new electrochemical application angle of graphitic carbon nitride theoretically as well as experimentally.
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MOLECULES
·
2024
·Vol. 29
·期 18
·4490
·
IF 4.2
Yuxia Li,Jingxuan Ren,Zeting Meng,Baozhu Zhang
In this study, a turn-on fluorescence sensor for the detection of adenosine 5′-triphosphate (ATP) was developed and tested using ATP-DNA2-Ag NCs. The results showed that the fluorescence of ATP-DNA2-Ag NCs was significantly enhanced with the addition of ATP. The fluorescence enhancement was a result of the specific binding activity of the ATP aptamer and ATP, which caused G-rich sequences to approach the dark DNA-Ag NCs, owing to the alteration in ATP aptamer conformation. The proposed sensor demonstrated a good linear range of 18–42 mM and a limit of detection (LOD) of 2.8 μM. The sensor’s features include sensitivity, selectivity, and simple operation. In addition, the proposed sensor successfully measured ATP in 100-fold diluted fetal bovine serum.
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PubMed
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Surfaces and Interfaces
·
2024
·
IF 5.7
Jun Han,Fangzhou Wu,Zhongwei wang,Yan Gao,Bin Dai,Wei Wang
The performance of the photocatalysts is influenced by factors such as electron generation ability, charge separation rate, and active sites distribution. In this study, needle-shaped precursors were prepared through low-temperature supramolecular self-assembly, and conical porous hollow carbon nitride (PHCN) was obtained after high-temperature pyrolysis. The PHCN not only possesses a thin-walled porous structure but also contains nitrogen defects embedded in its structure, which synergistically enhance the efficiency of photogenerated charge separation and provide more reactive sites. The DFT calculations showed that nitrogen defects and Pt-loading synergistically optimize the intermediate reaction process of graphitic carbon nitride (g-C 3 N 4 ). PHCN had excellent photocatalytic degradation of tetracycline hydrochloride (TCH) and Rhodamine B (Rh B). The photocatalytic hydrogen evolution rate of PHCN was 20.0 times higher than that of bulk g-C 3 N 4 (BCN). This study elucidated the relationship between crystallization rate and precursor morphology, as well as the influence of their physicochemical properties on photocatalytic performance. It also lays the foundation for constructing materials with nitrogen defects and special morphology through supramolecular self-assembly.
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Desalination and Water Treatment
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2024
·
IF 1
Chaoliang Wang,Xiaoyang Zhao,Yongjun Li,Dehu Yang,Fuyang Liu,Feng Liu,Li Li,Ping Ke
A series of simple and low-cost Ca-doped g-C 3 N 4 (Ca/CN-X) photocatalysts were fabricated through a two-step calcination method for photodegradation of methylene blue (MB) simulated dyeing wastewater. The results showed that the photodegradation efficiency of Ca/CN-15 % on MB removal under visible light was 97.7 %, and the degradation rate constant was 4 times that of CN, showing the best photocatalytic performance. This was attributed to the fact that the doping of Ca expanded the absorption band edge, reduced the band gap, and suppressed the photogenerated electron-hole recombination, thereby increasing its corresponding photocatalytic activity. A possible photodegradation mechanism was explored, and it was found that h + was the main active species during the process. The above indicated that Ca/CN-X can be regarded as a promising catalyst for dyeing wastewater treatment.
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Progress in Natural Science-Materials International
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2024
·
IF 4.8
Peng Wu,Tao Zhou,Zhongqiu Tong,Fengshuo Xi,Jijun Lu,Xiufeng Li,Wenhui Ma,Shaoyuan Li,Xingwei Yang
Graphitic carbon nitride (g-C 3 N 4 ) is a promising material for photocatalytic hydrogen production owing to its tunable band structure and high charge carrier density, however, it displays a high carrier recombination rate. Defect engineering can solve this problem by providing active sites within g-C 3 N 4 to accelerate the separation of photogenerated electrons and holes and enhance its solar light absorption. Previous studies have implied that there exists a defect concentration threshold for obtaining the maximum photocatalytic hydrogen production performance, but the underlying mechanism remains unclear. In this study, the relationship between charge carrier density and exciton recombination was investigated to address this issue. A series of g-C 3 N 4 photocatalysts with different tri-coordinate nitrogen (N 3C ) vacancy concentrations were synthesized using in-situ coprecipitation polymerization. The catalytic performance is related to the vacancy concentration, higher vacancy concentration will lead to higher carrier separation efficiency and carrier density of g-C 3 N 4 , as well as better photocatalytic hydrogen production performance. However, when excessive vacancies act as recombination centers, the charge carrier recombination rate is increased, which will also adversely affect the photocatalytic hydrogen production performance.
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Nanomaterials
·
2025
·Vol. 15
·期 5
·410
·
IF 4.3
Yongxin Lu,Shangjie Gao,Teng Ma,Jie Zhang,Haixia Liu,Wei Zhou
The construction of heterojunctions can effectively inhibit the rapid recombination of photogenerated electrons and holes in photocatalysts and offers great potential for pollutant degradation. In this study, a Z-scheme heterojunction g-C3N4/WO3photocatalyst was synthesized using a combination of hydrothermal and calcination methods. The photocatalytic degradation performance was tested under visible light; the degradation efficiency of Rh B reached 97.9% within 15 min and that of TC-HCl reached 93.3% within 180 min. The excellent photocatalytic performance of g-C3N4/WO3composites can be attributed to the improved absorption of visible light, the increase in surface area, and the effective separation of photogenerated electron–hole pairs. In addition, after four cycles of experiments, the photocatalytic performance of g-C3N4/WO3did not decrease obviously, remaining at 97.8%, which proved that the g-C3N4/WO3heterojunction had high stability and reusability. The active radical capture experiment confirmed that h+and ·O2−played a leading role in the photocatalytic degradation. The Z-scheme heterojunction g-C3N4/WO3designed and synthesized in this study is expected to become an efficient photocatalyst suitable for environmental pollution control.
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POLYMER ENGINEERING AND SCIENCE
·
2015
·Vol. 55
·期 12
·2829-2837
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IF 1.52
Shushan Yuan,Juan Wang,Xiaojun Wang,Shengru Long,Gang Zhang,Jie Yang
Poly(arylene sulfide sulfone) (PASS) is a kind of newly developed polymeric membrane material which has excellent mechanical strength, thermal stability, and solvent resistance. And, it would be a potential material for high temperature ultrafiltration and organic solvent filtration. In this article, PASS hybrid ultrafiltration membrane with improved antifouling property was prepared by mixing TiO 2 nanoparticles which were grafted with polyacrylic acid (PAA). These membranes were prepared by a phase inversion technique and their separation performance and antifouling property of the prepared membranes were investigated in detail by SEM, FTIR, EDS, contact angle goniometry, filtration experiments of water, and BSA solution. The results shown that the TiO 2 - g -PAA nanoparticles dispersed well in membrane matrix, the hydrophilicity of the membranes prepared within TiO 2 - g -PAA nanoparticles have been improved and these membranes exhibited excellent water flux and antifouling performance in separation than that of the pure PASS membranes and PASS membranes with TiO 2 nanoparticles. More specifically, among membrane sample M0, M1.5, and MP1.5, MP1.5 which contained 1.5 wt% TiO 2 - g -PAA exhibited the highest water permeation (190.4 L/m 2 h at 100 kPa), flux recovery ratio, and the lowest BSA adsorption amount. POLYM. ENG. SCI., 55:2829–2837, 2015. © 2015 Society of Plastics Engineers
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Jing Liu,Huiyu Dong,Carmen Sans,Xiangjuan Yuan
In this study, a series of boron (B) and oxygen (O) dual doped g-C 3 N 4 (BOCNx) composites with different boric acid dopant dosages were successfully synthesized through one-step thermal condensation method. Amongst, BOCN50 exhibited the best catalytic ozonation activity, achieving 97 % of iopamidol (IPM) degradation within 15 min and the highest k value (0.3166 min −1 ), which was 8 times higher than that of ozonation alone. Multiple characteristic techniques were used to explore the surface properties of BOCNx catalysts and it was found that B and O primarily coordinated in g-C 3 N 4 as the forms of C-O, C = O and B-N bonds. Further investigation in the structure–activity relationship of BOCNx catalyst indicated that the increasing contents of oxygen-containing functional groups and B-N bonds were linearly correlated with the IPM degradation rate. The results of scavenger experiments and ESR analysis demonstrated that the main reactive oxygen species involved were hydroxyl radicals, superoxide radicals, and singlet oxygen ( • OH, • O 2 − and 1 O 2 ). Additionally, up to 12 intermediate products of IPM during the reaction were detected, and the corresponding degradation pathways were elucidated. Finally, the structure of BOCN and the active sites for O 3 adsorption were determined by density functional theory (DFT) calculation, thus providing theoretical support for studying the mechanism of catalytic ozonation degradation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Feihu Mu,Jin Huang,Shengpan Xu,Ruiqing Wang,Xiaozhong Chu,Zhipeng Cheng,Xujing Guo,Wei Zhao,Benlin Dai,Wenshuai Zhu
Dissolved organic matter (DOM) in black-odorous water can cause excessive growth of plants and algae, leading to deterioration of water quality. Herein, an S-scheme Au/g-C 3 N 4 /BiVO 4 heterojunction was constructed using a three-step method for DOM degradation in real black-odorous water in the presence of peroxymonosulfate (PMS). 4Au/g-C 3 N 4 /BiVO 4 /PMS exhibited highly efficient photocatalytic performance, and the DOM removal rate could reach 92.9 %, which was 19.1 and 9.9 times higher than that of g-C 3 N 4 /PMS and BiVO 4 /PMS, respectively. The changes of fluorescence components in DOM were detected using synchronous fluorescence spectra and two-dimensional correlated spectroscopy analysis, and the toxicity of catalytically treated black-odorous water was evaluated by growth inhibition of Escherichia coli . A reasonable S-scheme mechanism was suggested by theoretical calculations and photoelectrochemical tests. The S-scheme mechanism and the synergistic effect of photocatalysis and hybrid advanced oxidation process (HAOP) increased the catalytic activity of Au/g-C 3 N 4 /BiVO 4 /PMS.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xin Xiao,Yaoting Wang,Huimin Zhang,Zhiling Chou,Haochen Ding,Xinyu Lu,Yiming Zou,Li Chen,Dongping Sun
This study investigated the controllable synthesis method and photocatalytic performance of a g-C 3 N 4 /MnIn 2 S 4 heterostructure. Through a carefully designed experimental scheme, the g-C 3 N 4 /MnIn 2 S 4 heterostructure was successfully prepared, and its composition, structure, and morphology were thoroughly characterized. The experimental results demonstrated that the heterostructure achieved a high photodegradation efficiency of 92.3% for RhB and 72.8% for TC under visible light, significantly outperforming its individual components. After four cycles, the degradation rate remained relatively stable. The photocatalytic reaction mechanism was thoroughly investigated by adding different trapping agents, revealing that the active species were mainly ·O₂⁻ and h⁺ and EPR, which significantly affected the degradation efficiency. The g-C 3 N 4 /MnIn 2 S 4 heterostructure achieved efficient separation of the photogenerated carriers, significantly enhancing its photocatalytic performance for RhB and tetracycline degradation. VB-XPS tests exhibited that the valence bands of MnIn 2 S 4 and g-C 3 N 4 were 1.25 and 2.25 eV, respectively. Combined with UV-vis DRS results, the calculated conduction bands are -0.79 and -0.53 eV, respectively. The study found that efficient separation between photogenerated holes and electrons in the heterostructure had a crucial impact on its photocatalytic performance.
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