SOLID STATE SCIENCES
·
2024
·
IF 3.4
Xiangyu Cao,Guoyu Liu,Jianhua Zheng,Zhihui Sui,Shunji Zheng,Qi Zhang
Considering the important role of morphology and interface during the photocatalytic process, the g-C 3 N 4 @Co 3 V 2 O 8 Z-scheme heterojunction photocatalyst was successfully prepared by a facile hydrothermal method and subsequent wet-impregnation treatment. The sample synthetic method allowed ultra-thin g-C 3 N 4 nanosheets to uniformly adhere on the surface of Co 3 V 2 O 8 hollow spheres, which not only avoided the aggregation of g-C 3 N 4 nanosheets but also benefited from forming a multidirectional contact interface to short the transfer distance of photoelectrons between g-C 3 N 4 and Co 3 V 2 O 8 . Benefitting from the unique hollow structure and Z-scheme configuration, g-C 3 N 4 @Co 3 V 2 O 8 composite with 10 % g-C 3 N 4 showed a better photocatalytic degraded performance, achieving 93.7 % degradation efficiency of methylene blue (MB) in water within 60 min, which was 3.1 and 1.9 times higher than these of pristine Co 3 V 2 O 8 and g-C 3 N 4 , respectively. The active species analysis demonstrated that ·O 2− and ·OH played a pivotal role in the photocatalytic degradation of MB. Based on the experimental results a comprehensive photocatalytic degradation mechanism was proposed. Our work provided an opportunity to design Z-scheme heterojunction photocatalysts for pollutant degradation in wastewater.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Zhen Wei,Fenfen Liang,Yanfang Liu,Wenjiao Luo,Jun Wang,Wenqing Yao,Yongfa Zhu
TiO 2 /g-C 3 N 4 (TCN) thin film electrode was fabricated via a surface hybridization and dip-coating method. Phenol could be completely mineralized and the pollutants in coking wastewater could be degraded quickly by TCN under simulated solar light and electric field. The characteristics of the photoelectrocatalytic (PEC) degradation of phenol-containing coking wastewater were investigated under visible light, ultraviolet light and simulated solar irradiation. The results showed that phenol was degraded completely by the TCN-0.3 with a 1.5 V bias in 1.5 h under simulated solar irradiation with 100% TOC removal rate. 45% of the TOC for the coking wastewater was removed by the TCN-0.3 with a 1.5 V bias under 5.0 h simulated solar irradiation, which was 2.45 and 5.69 times as high as that of the pure TiO 2 and g-C 3 N 4 , respectively. The surface hybrid heterojunction formed between TiO 2 and g-C 3 N 4 promotes the migration of the photogenerated electrons and holes and greatly improves the degradation efficiency with applied potential. The significant synergistic effect between the electrocatalytic and photocatalytic oxidation processes in PEC is conducive to electron-hole pair separation, producing the more active substances, such as hydroxyl radicals, and increases the degree of degradation and mineralization of phenolic compounds.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Weiqiang Kong,Shaofeng Xu,Jinpeng Yin,Haining Yang,Wei Feng,Liying Cui,Zhongsheng Wen
Red phosphorus (RP) has attracted wide attention as a promising anode candidate for sodium ion batteries due to its admirable specific capacity, safe working potential and low cost. However, its large volumetric expansion during desodiation/sodiation process and poor electronic conductivity hinder the progress of red phosphorus electrodes. Here, the N -enriched reduced graphene oxide-C 3 N 4 (rGO-C 3 N 4 ) network is utilized to facilitate the electronic conductivity and construct a robust architecture through P N bonds. Admirable bonding strength between phosphorus and the C 3 N 4 hybrid framework is revealed by the calculations via the first principles based on density function theory. The red phosphorus/rGO-C 3 N 4 anode for sodium ion batteries obtained via a facile ball-milling method exhibits a discharge capacity of 652.6 mA h g −1 after 100 cycles. This method holds great promise on developing red phosphorus anode on sodium-ion batteries.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Linghui Ding,Chuanhui Geng,Yan Hao,Kecun Ma,Mei Liu,Pengfei He,Zhi Chen,Qingguo Chen
A new lotus-like Bi 2 WO 6 /Bi 2 S 3 /g-C 3 N 4 composite was synthesized through hydrothermal reaction and physical doping techniques. And the degradation of norfloxacin (NFX) using Bi 2 WO 6 /Bi 2 S 3 /g-C 3 N 4 (BiSW-GCN) photocatalytic material was investigated. Scanning electron microscopy (SEM) revealed that spherical Bi 2 S 3 and flake-like g-C 3 N 4 were closely adhered to the petals of Bi 2 WO 6 , with a uniform distribution of various elements observed in the Raman spectra. These spectra also indicated a reduction in fluorescence intensity and the recombination rate of photogenerated electron-hole pairs. Through analysis of the degradation efficiency of NFX with varying ratios of the photocatalytic materials, it was determined that the optimal photocatalytic performance was achieved when Bi 2 S 3 constituted 3 % of the Bi 2 WO 6 content, and the Bi 2 WO 6 /Bi 2 S 3 to g-C 3 N 4 ratio was set at 20:1. The influence of pH value, photocatalyst concentration, and NFX concentration on the degradation rate within the reaction environment was examined. Results showed that the material exhibited its highest efficiency in a neutral environment. With the addition of 1 g/L BiSW-GCN, the degradation rate of an 8 mg/L NFX solution reached 92.4 % within 120 min, and the total organic carbon (TOC) removal rate achieved 41.1 %. The kinetic constant for BiSW-GCN was calculated to be 0.0206 min −1 . A trapping experiment demonstrated that the primary toxicity of the photocatalytic process was due to hole action, followed by photoelectron generation. Based on the inhibitory effect of NFX on E. coli , the toxicity of the degraded NFX solution was found to be absent when analyzed using the product intermediate toxicity assessment method, thus confirming the potential for the by-product to be non-toxic.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·A3564
·
IF 3.12
Yuanduo Qu,Zhiwei Tang,Lianfeng Duan,Xuesong Li,Xueyu Zhang,Wei Lü
Great efforts have been dedicated to fabricating electrode materials of supercapacitors especially for carbon-based system. To achieve satisfied device performance, the fabrication of electrodes generally involved complicated procedure, poisonous agents, and expensive materials. Herein, we develop a facile and economical method to prepare carbon-based electrode materials. The nitrogen-rich g-C3N4 is used as template and N source, and glucose is used as C source to prepare N-doped 3D porous carbon materials by hydrothermal treatment followed by calcinations. The structure and N content could be adjusted by hydrothermal temperature. The specific surface area of 954 m2 g−1 and 11% N content is achieved, thus providing the excellent carrier storage ability and electrocatalytic activity. The supercapacitors fabricated from present 3D carbon networks achieve a specific capacitance of 90F/g, and shows excellent cycling stability. Present method is free of involving complicating procedure and poisonous reagents for fabrication of 3D carbon structures.
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高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Ziyang Jia,Hongzhang Zhang,Ying Yu,Yuqing Chen,Jingwang Yan,Xianfeng Li,Huamin Zhang
Lithium–sulfur (Li–S) batteries have great potential as an electrochemical energy storage system because of the high theoretical energy density and acceptable cost of financial and environment. However, the shuttle effect leads to severe capacity fading and low coulombic efficiency. Here, graphitic carbon nitride (g–C 3 N 4 ) is designed and prepared via a feasible and simple method from trithiocyanuric acid (TTCA) to anchor the polysulfides and suppress the shuttle effect. The obtained g–C 3 N 4 exhibits strong chemical interaction with polysulfides due to its high N–doping of 56.87 at%, which is beneficial to improve the cycling stability of Li–S batteries. Moreover, the novel porous framework and high specific surface area of g–C 3 N 4 also provide fast ion transport and broad reaction interface of sulfur cathode, facilitating high capacity output and superior rate performance of Li–S batteries. As a result, Li–S batteries assembled with g–C 3 N 4 can achieve high discharge capacity of 1200 mAh/g at 0.2 C and over 800 mAh/g is remained after 100 cycles with a coulombic efficiency more than 99.5%. When the C–rate rises to 5 C, the reversible capacity of Li–S batteries can still maintain at 607 mAh/g.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Long Sun,Ting Du,Chao Hu,Juanni Chen,Jian Lu,Zhicheng Lu,Heyou Han
Carbon-based nanomaterials have been widely developed into innovative antimicrobial agents due to their advantages of high surface-to-volume ratio, extremely high mechanical strength, and distinct physicochemical properties. Here, the nanocomposite of graphene oxide/graphitic carbon nitride (GO/g-C3N4), a free-metal photocatalyst, was fabricated through sonication at room temperature and its antibacterial activity against Escherichia coli (E. coli) was investigated. The 100 μg/mL GO/g-C3N4 composite was found to kill 97.9% of E. coli after 120 min visible light irradiation, which was further confirmed by fluorescent-based cell membrane integrity assay. Additionally, the holes produced by photocatalysis were confirmed by electron spin resonance (ESR) spectra and trapping experiments to participate in photocatalytic sterilization as principal active species and were further verified by transmission electron microscopy (TEM) and scanning electron microscope (SEM) to lead to the distortion and rupture of cell membrane and finally cell death. Further photoluminescence (PL) spectra, cyclic voltammetry, photocurrent generation, and impedance spectroscopy (EIS) characterization revealed that the introduction of GO contributed to separate photogenerated electrons and prevents the electron–hole pairs of g-C3N4 from recombing to generate more h+, thus directly improving the bactericidal ability of GO/g-C3N4. Reusability assays indicated that the GO/g-C3N4 retained more than 90% of activity after four cycles of use. This study facilitates an in-depth understanding of the mechanism of visible light-driven disinfection and provides an ideal candidate sterilizing agent for treating microbial-contaminated water.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Wenjie Shan,Yun Hu,Zhaogao Bai,Mengmeng Zheng,Chaohai Wei
Different mass percents of g-C 3 N 4 /Bi 2 O 2 CO 3 and g-C 3 N 4 /BiOCl nanocomposites with intimately contacted interfaces were synthesized in situ by mixing Bi 2 O 3 nanoparticles with melamine or guanidine hydrochloride and calcinating at 550 °C for 3 h. The fabricated nanocomposites were well-characterized by various analytical techniques. The results showed that the Bi 2 O 2 CO 3 and BiOCl nanosheets grow out from the g-C 3 N 4 bulk, producing closely contacted interfaces between the Bi oxide component and the g-C 3 N 4 component. The UV–vis diffuse reflectance spectra of g-C 3 N 4 /Bi 2 O 2 CO 3 and g-C 3 N 4 /BiOCl nanocomposites exhibited increased visible light absorption compared to g-C 3 N 4 and Bi 2 O 3 separately. Moreover, the nanocomposites showed significantly enhanced photocatalytic activity for the degradation of dibutyl phthalate and methyl orange under visible light. A proposed photocatalytic mechanism for the enhanced photoactivity of nanocomposites was investigated by scavenging experiments and fluorescent spectroscopy. The increased photocatalytic activity is mainly attributed to the effective separation and transfer of photo-induced carriers in the intimate contact between g-C 3 N 4 and Bi 2 O 2 CO 3 or BiOCl. The results showed that the different precursors of g-C 3 N 4 have a significant effect on the composite's structure; i.e., Bi 2 O 3 can react to form different bismuth-based oxides depending on the different precursors used to generate g-C 3 N 4 . This work demonstrates a convenient way to fabricate visible light responsive materials with potential for environmental remediation.
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高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 5
·1325-1334
·
IF 5
Fengyun Su,Zhishuai Wang,Hailong Cao,Haiquan Xie,Wenguang Tu,Yonghao Xiao,Shukui Shi,Jiaqi Chen,Xiaoli Jin,Xin Ying Kong
Developing inexpensive co-catalysts for photo-thermal synergistic catalysis by artificially inducing active sites on non-noble metal compounds has drawn much attention recently. In this work, oxygen-deficient molybdenum oxide (MoO3−x) was in situ photodeposited on the surface of graphite-like carbon nitride (g-C3N4) to tremendously improve its photocatalytic activity for CO2 conversion. A series of characterization analyses divulged that the MoO3−x not only promoted the separation of photo-generated charge carriers, but also served as the active sites for the adsorption and activation of CO2 molecules. More importantly, the oxygen-vacancy defect sites of MoO3−x can trigger localized surface plasmon resonance (LSPR) that enables effective harnessing of near-infrared (NIR) photons, promoting photo-thermal synergistic catalytic conversion of CO2 into value-added fuels through full solar spectrum harnessing.
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高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Xu Huang,Yiwen Zhang,Zhi Liang,Yingfeng Zhao,Huiwen Yuan,Mingyang Li,Fengping Peng,Wei Wang
In this paper, a series of isotype heterojunction photocatalysts with urea-derived g-C 3 N 4 (CNU) as the core and cyanamide-derived g-C 3 N 4 (CNC) as the shell are reported. A much thinner CNC shell which can protect the CNU core from thermal etching and determines the light absorption is beneficial to improve the photocarrier transfer and separation efficiency, pore volume, and the overall crystalline degree of the most active CNU/CNC2 core–shell isotype heterojunction photocatalyst for rhodamine B (RhB) degradation. Contrast experiments confirm that the electron-derived oxidant species (⋅O 2 − ) play key roles in driving the RhB degradation.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Min Luo,Yu Bai,Rui Sun,Zhenhua Wang,Wang Sun,Peng Lin,Xian Dai,Kening Sun
Lithium–sulfur batteries are considered as one of the most potential energy storage devices in the future owing to their ideal theoretical energy density and specific capacity. However, the shuttle of soluble polysulfides and sluggish redox kinetics of polysulfides lead to insufficient use efficiency of active sulfur and the rapid capacity fading. In this study, novel Co-doped g-C3N4 (Co–CN) nanosheets are fabricated by a simple calcination process. The high discharge capacity of the commercial bulk S cathode with the Co–CN-modified separator is 1121 mAh g–1 at 0.2C with a satisfying rate performance of up to 3C. The Co–CN-modified separator also leads to excellent stability (640 mAh g–1 after 250 cycles) with high Coulombic efficiency of over 98%. At the sulfur mass loading of 3 mg cm–2, the cell can still deliver a discharge capacity of 719 mAh g–1 after 100 cycles with a high capacity retention of 95%. The improved performance can be attributed to the effective restriction of polysulfides shuttle due to the enhanced adsorption and catalytic conversion of polysulfides by the Co–CN nanosheet-modified separator. This work shares a simple and highly efficient strategy for increasing the performance of lithium–sulfur batteries.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Ben Chong,Lei Chen,Dezhi Han,Liang Wang,Lijuan Feng,Qin Li,Chunhu Li,Wentai Wang
A heterojunction photocatalyst based on porous tubular g-C 3 N 4 decorated with CdS nanoparticles was fabricated by a facile hydrothermal co-deposition method. The one-dimensional porous structure of g-C 3 N 4 provides a higher specific surface area, enhanced light absorption, and better separation and transport performance of charge carriers along the longitudinal direction, all of which synergistically contribute to the superior photocatalytic activity observed. The significantly enhanced catalytic efficiency is also a benefit originating from the fast transfer of photogenerated electrons and holes between g-C 3 N 4 and CdS through a built-in electric field, which was confirmed by investigating the morphology, structure, optical properties, electrochemical properties, and photocatalytic activities. Photocatalytic degradation of rhodamine B (RhB) and photocatalytic hydrogen evolution reaction were also carried out to investigate its photocatalytic performance. RhB can be degraded completely within 60 min, and the optimum H 2 evolution rate of tubular g-C 3 N 4 /CdS composite is as high as 71.6 μmol h −1 , which is about 16.3 times higher than that of pure bulk g-C 3 N 4 . The as-prepared nanostructure would be suitable for treating environmental pollutants as well as for water splitting.
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高影响因子
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