CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Lei Chen,Zhouyi Xiong,Hanguo Xiong,Zhenjiong Wang,Zia-ud Din,Asad Nawaz,Pengkai Wang,Chun Hu
The nano-TiO 2 was utilized to improve the bonding performance, structure stability and film-forming properties of renewable starch-based wood adhesive. The results showed that 4% nano-TiO 2 (nano-TiO 2 :starch, w;w) resulted in 6.5 MPa of shear strength and 6437 Pa.s of viscosity. The thermal stability was measured by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Additionally, low-field nuclear magnetic resonance (NMR) and rheological results exhibited the enhancement of nano-TiO 2 on the pseudoplasticity and structure which determined the state and migration of water. Besides, the structural characterization of copolymer was analyzed via fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analysis (XRD). Furthermore, the film-forming property was evaluated by small angle X-ray scattering (SAXS) and dynamic mechanical analysis (DMA). The morphological structures of adhesive were observed by scanning electron microscopy (SEM). In conclusion, the 4% nano-TiO 2 (nano-TiO 2 :starch, w;w) can be employed to prepare starch-based wood adhesives with superior properties for wood application.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yandong Xu,Mengxia Guo,Chengjun Ge,Ping Zhang,Wen Xu,Linlin Zhang,Shihao Zhou,Jianjun Liao
To facilitate the activation of peroxymonosulfate, it is useful to simultaneously tune the coordination environment of the single-atom catalyst and develop a structure that effectively exposes the active site. In this study, we used a pre-assembly calcination method to prepare a structure composed of Cu single atoms on O-doped g-C 3 N 4 nanosheets (5Cu-OCN), and studied how this structure can effectively activate PMS under visible light catalysis. Compared to the g-C 3 N 4 , the 5Cu-OCN exhibits significantly improved PMS activation effect. Cu single atoms play an important role in catalyzing PMS activation and removing carbamazepine from solution, and explain the contribution of photo generated electrons and holes in enhancing the performance of catalysts in PMS activation. Furthermore, the constructive cooperation of 5Cu-OCN photocatalysts by PMS activation and photocatalysis has been shown to be useful in real aqueous systems. The results indicate that the main pathway for the generation of 1 O 2 is through the 5Cu-OCN photocatalytic process to promote PMS activation. In addition, the active reaction species involved in the degradation of carbamazepine were identified. This study provides an efficient copper monoatomic catalyst that can react to visible light for 1 O 2 based advanced oxidation processes.
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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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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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Journal of Biobased Materials and Bioenergy
·
2016
·Vol. 10
·期 4
·284-289
·
IF 0.635
Jiang Ping,Jia Shan Shan,Wang Shuang,Xiao Jun Hua,Liu Wenjie,Wu Yiqiang
The pH- and temperature-responsive chitosan-graft-poly(2-(dimethylamino) ethyl methacrylate) (CS-g-PDMAEMA) were synthesized via atom transfer radical polymerization (ATRP) and evidenced by FTIR spectroscopy. Chitosan macroinitiator (CS-Br) was prepared by phthaloylation of amino
groups of chitosan and acylation of hydroxyl groups of chitosan with 2-bromoisobutyryl bromide. The pH and temperature responses of the copolymer micelles were characterized by particle diameter and particle size analyzers. The film prepared from CS-g-PDMAEMA was used as a coating film
on the surface of the grape. And the film prepared from 1 wt% CS-g-PDMAEMA solution was able to slow the loss of water in grape. The results revealed that the CS-g-PDMAEMA had potential application as active coating materials in the storage of fresh grape.
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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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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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ANALYTICAL SCIENCES
·
2025
·
IF 2
Xia Shaojie,Yang Zhenyuan,Sun Xiaohui,Huang Junjie,Peng Kuan,Wang Yonghong
Ochratoxin A (OTA), a highly toxic mycotoxin, extensively contaminates a wide range of food commodities. Given increasing demands for sensitive and user-friendly detection platforms, we developed a colorimetric OTA biosensor leveraging copper-silver nanoclusters (Cu/Ag NCs), whose peroxidase-like activity is augmented via G/C-rich DNA hybridization. The system employs two tailored DNA strands: a template strand featuring a cytosine-rich domain for NC synthesis flanked by terminal recognition segments and an enhancer strand containing a guanine-rich signal amplification domain and a complementary linker. Upon OTA binding with the aptamer, the apt-template complex dissociates, facilitating template-enhancer hybridization to form G/C-rich double-stranded DNA. This structural transition substantially enhances the peroxidase-like activity of DNA-Cu/Ag NCs, accelerating the oxidation of 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 while simultaneously amplifying the colorimetric signal. Quantitative OTA detection is accomplished by monitoring this dynamic color response. The biosensor demonstrates a semi-log linear detection range from 5.0 nM to 1.0 μM with a detection limit of 5.0 nM. Furthermore, the specific test has high selectivity for other common mycotoxins, and its applicability has been validated through real sample analysis, suggesting that the DNA-Cu/Ag NCs biosensor used for OTA detection holds promising practical applications in food samples. Graphical abstract
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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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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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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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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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