CHEMOSPHERE
·
2023
·
IF 8.8
Xiangwei Tang,Rongdi Tang,Zhanpeng Zhou,Ling Li,Yaocheng Deng,Daoxin Gong,Lihua Yang,Tianwei Song,Mingxuan He
In the field of photocatalysis , Graphitic carbon nitride (g-C 3 N 4 ) has received a lot of attention for its superior functionality and benefits. However, it suffers from the fatal defect of low charge separation efficiency, which is well addressed by tourmaline's self-contained surface electric field. In this work, tourmaline/g-C 3 N 4 (T/CN) composites were successfully synthesized. Due to its surface electric field effect, tourmaline and g-C 3 N 4 are stacked on top of each other. It makes its specific surface area increase greatly and more active sites are exposed. Additionally, the rapid separation of photogenerated electron holes under the action of electric field promotes the photocatalytic reaction. T/CN exhibited excellent photocatalytic performance under visible light, with 99.9% Tetracycline (TC 50 mg L −1 ) removal after 30 min. Compared to tourmaline (0.0160 min −1 ) and g-C 3 N 4 (0.0230 min −1 ), the T/CN composite's reaction rate constant (0.1754 min −1 ) was 11.0 and 7.6 times higher. A series of characterizations also determined the structural properties and catalytic performance of the T/CN composites, which were found to have a larger specific surface area, narrower band gap, and higher charge separation efficiency compared to the monomer . In addition, the toxicity of tetracycline intermediates and their degradative pathways were investigated, and the toxicity of the intermediates was found to be reduced. Given the quenching experiments and active substance determination, it was also found that h + and ·O 2 − play a major role. This work provides more inspiration for photocatalytic material performance research as well as green innovation for environmental management.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Nannan Wang,Bonan Hao,Hao Chen,Rongkang Zheng,Baojie Chen,Shihong Kuang,Xiaodong Chen,Lifeng Cui
Developing a cost-effective, efficient, and facile prepared electrocatalyst for oxygen reduction (ORR) and evolution reaction (OER) is critical for a range of renewable energy technologies. Herein, we report unique Co 4 N nanoparticles loading on g-C 3 N 4 nanotubes (Co 4 N@CNNT) bifunctional electrocatalyst for OER and ORR by an in-situ method. Highly dispersed Co 4 N nanoparticles as the active sites gather at the top of the g-C 3 N 4 nanotube (CNNT), while the six-fold cavities from smooth CNNT with an outer diameter of 48 nm and an inner diameter of 22 nm act as anchor sites to preferentially coordinate with the active sites. Benefiting from the distinctive structure features, the intrinsic metallic Co 4 N@CNNT exhibits high electrocatalytic performances. Electrochemistry studies show that an onset potential of 0.94 V and a half-wave potential of 0.86 V of Co 4 N@CNNT are obtained that are superior to Pt/C catalyst. A low overpotential of 285 mV at an anodic current density of 10 mA cm −2 during the OER process is obtained that is superior to the IrO 2 catalyst; and lower Tafel plot and good durability are also observed. Our findings provide a new strategy for the fabrication of an efficient bifunctional electrocatalyst for OER and ORR.
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高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Fanpeng Meng,Jun Wang,Wenjie Tian,Huayang Zhang,Shaomin Liu,Xiaoyao Tan,Shaobin Wang
Photocatalysis is an effective process to utilize solar energy for contaminants degradation, and the catalytic performance depends on the intrinsic structural properties of catalysts and organic molecules as well as their interactions. This work innovatively reveals that layer-structured graphitic carbon nitride (GCN) and BiOBr exhibit distinctly different adsorption and photocatalytic behaviors and that they show respective advantages in catalytic removals of Congo red (CR) and ibuprofen (IBP). The kinetic rate constant of CR removal by GCN was about 1.3 times higher than that by BiOBr, while BiOBr has a superior photocatalytic degradation performance towards IBP with a 25-fold-higher kinetic rate constant than that of GCN. Experiments including temperature-controlled adsorption and degradation as well as mechanism discussion confirmed that IBP and CR could be strongly adsorbed in the surface intralayer of BiOBr and GCN, through unique coordination interaction, while CR adsorption on BiOBr was dominated by interlayer adsorption. Thermodynamically, we examine that these layered catalysts can induce different reactive species according to their unique valence band and conduction band locations and then trigger different oxidation pathways for degradation reaction, as confirmed by the quenching experiments. Depending on the dissociated superoxide (O 2 •− ) radical induced indirect oxidation pathway, GCN has higher kinetics for CR degradation than BiOBr. In contrast, BiOBr offers better photocatalytic performance for IBP degradation through the direct oxidation pathway of photogenerated holes (h + ). BiOCl, with an analogous structure to BiOBr, also exhibits a similar behavior to BiOBr. This work provides a new perspective for understanding the different behaviors of layer-structured materials in selective oxidation of pollutants.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 25
·12217-12228
·
IF 3.925
Xiaoying Yuan,Yue Leng,Changlong Fang,Kangqi Gao,Chenyu Liu,Jianjun Song,Yingshu Guo
Tetracycline hydrochloride (TC) is a typical refractory organic pollutant, and is frequently detected in different water environments, which will increase microbial drug resistance, destroy ecosystems and threaten human health. It is urgent to develop a simple and effective catalyst for TC removal. In this paper, a facile two-step calcination method was used to prepare a LaCoO3/g-C3N4 composite catalyst with high activity and high stability for PMS activation to degrade TC. Various characterization results confirmed that the LaCoO3/g-C3N4 composite catalyst possessed smaller particle size, higher stability and faster electronic transmission ability. Benefiting from the synergistic effect between LaCoO3 and g-C3N4, the LaCoO3/g-C3N4 catalyst showed high activity for PMS activation to degrade different antibiotics. Furthermore, the results of the quenching experiments and the electron paramagnetic resonance (EPR) tests showed that the generated SO4˙− and 1O2 radicals during the PMS activation process played a key role in pollutant degradation. The effect of different reaction conditions (including pH, temperature, PMS concentration, catalyst dosage and different anions) on the performance of the catalyst was also investigated. The catalyst cycle evaluation experiments showed that the LaCoO3/g-C3N4 composite catalyst has high stability and reusability. The phytotoxicity evaluation based on seed germination experiments indicated that the LaCoO3/g-C3N4 composite catalyst system can effectively reduce the toxicity of antibiotics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chuanxin Teng,Qingli Xie,Rongping Yang,Shiji Deng,Kaiwei Li,Hanli Qiao,Xuehao Hu,Libo Yuan,Xiaogang Xue
Tetracycline (TC) detection is crucial for food safety, ecological balance, and human health. This study proposes an evanescent wave enhanced micro-structure polymer optical fiber (POF) sensor for highly sensitive detection of TC by employing the C 3 N 4 -MIL-53 heterostructure. The micro-structure composed of a side-polish region and micro-grooves, which can effectively enhance the intensity of POF's evanescent wave. The C 3 N 4 -MIL-53 heterostructure was fabricated and modified on the side-polish region as the sensitive film for selective adsorption and enrichment of TC molecules. This molecular adsorption process induced localized refractive index increases in the film, which subsequently led to an attenuation of the transmitted light. A theoretical model was established to illustrate the enhanced sensing principle of the micro-structure on POF and the structural parameters of the sensors are experimentally optimized. The sensor demonstrates the rapid detection capability of TC, and the sensitivity of the sensor reaches to −0.00155 ppm −1 with range of 5–20 ppm, and the LOD is 0.005 ppm. The proposed micro-structure POF sensor features easy fabrication and low-cost, which provides a new approach for TC detection.
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产品关联
DOI
高影响因子
Current Analytical Chemistry
·
2024
·Vol. 20
·期 3
·183-190
·
IF 1.7
Ma Yue,Liu Xuqiao,Yan Kai,Zhang Jingdong
Background: 17β-estradiol (E2) is a steroid hormone that has the potential to disrupt the endocrine system, leading to adverse effects on both humans and ecosystems, even when present in low concentrations. The quantitative determination of E2 is of great practical significance.
Hypothesis: Electrochemical methods offer several advantages, including low cost, ease of operation, and potential for miniaturization, which makes them suitable for on-field detection applications. Methods: This research developed a miniaturized electrochemical sensor utilizing
graphitic carbon nitride (g-C3N4) assembled on an AuNPs/ITO film electrode for sensitive voltammetric detection of a steroid hormone, E2. Results: Compared with AuNPs/ITO electrodes, the g-C3N4/AuNPs/ITO exhibits higher sensitivity for voltammetric
detection of E2. Under optimal conditions, the differential pulse voltammetric response on the g-C3N4/AuNPs/ITO electrode was proportional to E2 concentration in the 25 ~ 600 μmol/L range, with a detection limit of 6.5 μmol/L. Conclusion: The proposed g-C3N4/AuNPs/ITO
electrode exhibited a wide linear range, good selectivity, and practical applicability for determining E2 in environmental water samples with acceptable recovery.
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高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Guobin Li,Zhenbang Han,Tao Wang,Minghui Zhang,Qiaoqiao Liu,Tong Zhang,Xiaoming Zhao
Fe-doped graphitic carbon nitride (g-C 3 N 4 ) represents an attractive photo-Fenton catalyst for organic contaminants removal, but the practical performances still need to be improved for large-scale application. Herein, we developed a high-efficiency photo-Fenton catalyst by anchoring Fe-g-C 3 N 4 onto an amidoxime-functionalized polyacrylonitrile fiber (AP) substrate through a simple hydrothermal approach. Comprehensive characterizations demonstrate the strong catalyst-support interaction via the axial coordination bonding between -OH groups and Fe 3+ , which could induce electric polarization of Fe-g-C 3 N 4 to promote the H 2 O 2 adsorption and activation. The fibrous support could also accelerate the photoelectrons transfer from g-C 3 N 4 to Fe 3+ by strengthening the d-π conjugated large π bond, as well as alleviate the backflow recombination from Fe 3+ to g-C 3 N 4 through the electron sink effect. These synergistic qualities resulted in superior photo-Fenton performance for organic contaminants removal, which delivered 4.0-fold higher degradation kinetics than that of the Fe doped g-C 3 N 4 powder catalyst and exhibited unexpected high activity at strong basic environment (pH = 12). Our work demonstrates an ingenious and simple way to design exceptional photo-Fenton catalysts for environmental remediation.
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 12
·3270-3278
·
IF 5.726
Dan Liu,Chengwei Qiu,Minbo Li,Yanyu Xie,Lu Chen,Huaxiang Lin,Jinlin Long,Zizhong Zhang,Xuxu Wang
Kornblum oxidation (benzyl bromide to benzaldehyde) can be realized efficiently by NaOH-modified graphitic carbon nitride (g-C3N4). Different from the oxidation reaction carried out at high temperature using DMSO as an oxidant, our reaction is eco-friendly because it is carried out at room temperature under LED light irradiation using molecular oxygen as an oxidant, which avoids the problems of toxicity, pollution and purification. Alkali treatment leads to the surface deprotonation of g-C3N4 to form NaOH-modified g-C3N4 (Na/g-C3N4). The modifications of the electronic structure and surface chemical environment of g-C3N4 facilitate light absorption and formation of ˙O2− and therefore make the conversion of benzyl bromide reach up to 99%. This work demonstrates a green and sustainable route for benzaldehyde production and the superiority of g-C3N4 for organic syntheses.
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高影响因子
CRYSTENGCOMM
·
2023
·
IF 3.1
Yujie Jia,Shuhan Jiang,Qianchen Ou,Yanan Liu,Jian Zhang,Yangjie Zhou,Yuan Lian,Hongmei Wang
NiFe-LDH/g-C3N4 (LDH/CN) heterostructures with different amounts of NiFe-LDH (LDH) were prepared by a hydrothermal method and characterized using different experimental techniques. Their photocatalytic properties were investigated using the degradation of tetracycline hydrochloride (TC) and the production of hydrogen from water splitting. Experimental results showed that the hydrogen production rate (780.5 μmol g−1 h−1) was 2.29 times that of pristine CN, and the TC removal rate (76.3%) of 1.8LDH/CN was 3.71 times that of CN. According to the detailed study of the structural, optical, and photoelectrochemical properties, a type II charge transfer mechanism was proposed to explain the improved photocatalytic performance of LDH/CN.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Chenjie Ding,Shifei Kang,Wenxin Li,Weikang Gao,Zhihao Zhang,Lulu Zheng,Lifeng Cui
Heterogeneous photo-Fenton catalysts prepared by doping metal ions in g-C 3 N 4 are promising alternatives to traditional homogeneous Fenton catalysts, but are restricted by poor mesoporous structure and agglomerate of metal species. Recently, the highly uniformly dispersed metal-N active sites in various photocatalysts have been proved to be the critical reason for their enhanced catalytic activity. In this study based on reasonable control of mesoporous structure and metal-N active sites, mesoporous Fe-g-C 3 N 4 was synthesized using a simple one-step thermal shrinkage polymerization method using ferrous oxalate as iron source and pore-forming agent. The Fe and N elements in the triazine ring skeleton of Fe-g-C 3 N 4 form a σ-π bond, thus the photogenerated electrons can be quickly transferred to Fe 3+ to form Fe 2+ under the interaction of chemical bonds, accelerating the Fenton reaction rate. Density functional theory calculations results demonstrate that the energy band structure and electron cloud density distribution of Fe-Nx active structure are better than that of routine FeOx crystal structure with metal species agglomeration. In addition, the excellent mesoporous structure of Fe-g-C 3 N 4 creates conditions for the high exposure of Fe-Nx active sites in the photo-Fenton reaction under visible light. The as-developed Fe-g-C 3 N 4 system shows high recyclability and excellent photo-Fenton performance for removal of typical intractable pollutants (The degradation rate of dye and tetracycline reaches 98.2% and 98.7% at 60 and 120 min, respectively). This work provides a facile and sustainable route to develop mesoporous highly-active heterogeneous Fenton-like catalysts and even further general the design of general catalyst with ideal metal-N active sites, thereby promoting a feasible and efficient wastewater remediation solution.
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PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Zhenyu Zhao,Xuting Wang,Shifu Wang,Zuoyi Xiao,Shangru Zhai,Jiliang Ma,Xiaoli Dong,Haodong Sun,Qingda An
The development of g-C3N4-based photocatalysts with abundant active sites is of great significance for photocatalytic reactions. Herein, a smart and robust strategy was presented to fabricate three-dimensional (3D) g-C3N4 nanosheet-coated alginate-based hierarchical porous carbon (g-C3N4@HPC), including coating melamine on calcium alginate (CA) hydrogel beads, freeze-drying hydrogel beads as well as pyrolysis at high temperatures. The resulting photocatalyst possessed a significantly high surface area and a large amount of interconnected macropores compared with porous carbon without the melamine coating. The unique structural features could effectively inhibit the curling and agglomeration of g-C3N4 nanosheets, provide abundant photocatalytic active sites, and promote mass diffusion. Therefore, the g-C3N4@HPC composite exhibited remarkable photocatalytic activity and outstanding stability toward the photoreduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH4 under natural sunlight and simulated visible-light irradiation (λ > 420 nm) using a 300 W xenon lamp. Moreover, the mechanism toward the photocatalytic reaction was extensively studied by quenching experiments and electron spin resonance (ESR) experiments. The results showed that active hydrogen species were able to be achieved by following a dual-channel pathway in the NaBH4 system, which included photocatalytic reduction of H+ ions and photocatalytic oxidation of BH4– ions. This work not only opens up a new way to design efficient photocatalysts for various reactions but also provides a reference for an in-depth study of the photoreduction mechanism.
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高影响因子
SOLID STATE SCIENCES
·
2019
·
IF 2.155
Hu Jingyu,Yang Ran,Li Zhaohui,Sun Yuanqiang,Qu Lingbo,Alexander Nti Kani
The zinc oxide/graphitic carbon nitride (ZnO/g-C 3 N 4 ) heterostructured nanocomposite was successfully synthesized by a facile two-step process involving thermal condensation of melamine and hydrothermal in situ growth of globular zinc oxide (ZnO) nanoparticles on the surface of graphitic carbon nitride (g-C 3 N 4 ). The morphologies, chemical compositions, and optical properties of the prepared ZnO/g-C 3 N 4 were investigated via a series of characterization techniques. SEM and TEM validate the grafting of ZnO globular with a diameter of 40–50 nm on the surface of g-C 3 N 4 . The visible photodegradation activity of the nanocomposite was assessed via tetracycline and oxytetracycline as target pollutants. Under visible light irradiation, 15 wt% ZnO globular-g-C 3 N 4 exhibits high photocatalytic activity with 78.4% of tetracycline degraded in 50 min and 63.5% of oxytetracycline in 50 min which was much faster photocatalytic degradation efficiency than that of the reported materials. Reactive species scavenging experiments revealed that photogenerated holes are the main reason for the photocatalytic degradation. After six recycles, the ZnO globular-g-C 3 N 4 resulted in 70% degradation efficiency of TC suggesting its high stability and reusability. This work proved a new insight for constructing novel high-performance photocatalysts for TC degradation.
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