APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Wenjie Tian,Xiongxiong Zeng,Wencong Liu,Lei Mao,Fen Guo,Yang Gui,Lan Yuan
Constructing a dual-functional photoredox system coupling fine-chemical synthesis with hydrogen peroxide (H 2 O 2 ) production provides an intriguing and eco-friendly protocol for advancing sustainable practical applications. Herein, we present a facile one-pot strategy for fabricating a porous N-rich g-C 3 N 4 /g-C 3 N 5 heterojunction (denoted as pN-N 4 -N 5 ) using mixed melamine and 3-amino-1,2,4-triazine as the precursors with NH 4 Cl as a penetrant for in-situ structure engineering. The resultant metal-free pN-N 4 -N 5 exhibited a remarkable performance of H 2 O 2 generation rate of 2.71 mmol g −1 h −1 with simultaneous production of industrially important 2-phenylbenzimidazole (2-BZ) under visible light and open air, along with a yield of 97 % and selectivity of > 99 %, outperforming most of the reported carbon nitride-based reaction systems for single-functional H 2 O 2 or 2-BZ synthesis. Extensive characterizations and density functional theory (DFT) studies revealed that such a heterojunction with well-matched band structure, enlarged interlayer space and enriched amino groups on the catalyst surface enables the facilitated spatially oriented charge flow, efficient mass transfer and reactants activation, thus offering an efficient and sustainable platform to furnishing the three-in-one photoredox systems to produce bidirectional valuable products.
研究领域:
材料科学
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光催化
·
可持续能源
·
有机合成
·
环境化学
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高影响因子
FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 8
·2167-2175
·
IF 2.347
Li Wei,Liu Qian,Zhang Guoyu,Cheng Xuedong,Wang Yingfeng,Xu Zhenzhen
This work aimed to evaluate the paste stability and desizability of new starch grafted copolymer [poly(sodium allyl sulfonate)- g -starch- g -poly(ethyl acrylate)] (PSAS- g -starch- g -PEA) for providing an important supporting role in sizing application. The PSAS- g -starch- g -PEA samples were prepared by grafting reaction of acid-thinned starch (AHS) with SAS and subsequent with EA in water phase. The PSAS- g -starch- g -PEA granules were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Also, paste stability was assessed and desizability was investigated in terms of desizing efficiency, swelling ability of the film and time interval for the break of starch film in water. Compared with control AHS, the PSAS- g -starch- g -PEA had higher paste stability, desizing efficiency and swelling ability, and lower time interval required, concluding that the PSAS and PEA branches could promote the paste stability and desizability of starch. Increasing the number of both branches facilitated the paste stability and desizability. PSAS- g -starch- g -PEA displayed potential value in textile sizing field.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 29
·13931-13939
·
IF 3.925
Nan Sun,Yuhan Jing,Yong Zhang,Xinru Li,Yaoning Bai,Yuwei Yan,Taoyuan Ouyang,Honglin Tan,Xiaoming Cai,Jinming Cai
Copper-based photocatalysts have attracted much attention because of their great prospects in photochemical conversion. However, the preparation of highly stable copper-based photocatalysts is a challenge. In this study, copper nanoparticles (Cu NPs) wrapped in graphitized polyacrylonitrile (g-PAN) were prepared by a two-step sintering method. Even if Cu@g-PAN is placed in the air for one month, the Cu NPs were still not oxidized. Furthermore, we succeeded in further introducing graphitized carbon nitride (g-C3N4) into the g-PAN shell structure, which was confirmed using a Scanning Transmission Electron Microscope (STEM), FT-IR, and UV-Vis absorption spectra. Cu@g-PAN/g-C3N4 can degrade 88.61% of methylene blue (MB) in one hour, showing a higher catalytic activity than Ag@g-PAN/g-C3N4 (55.18%). XPS and Auger electron spectroscopy tests of catalyzed Cu@g-PAN/g-C3N4 show that Cu is not oxidized. We have proposed a possible mechanism for charge separation and transformation in the Cu@g-PAN/g-C3N4 composites to explain the enhanced photocatalytic performance. This work provides a new method to protect Cu NPs and demonstrates the prospect of rational design of copper-based photocatalysts with high stability and efficiency.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Fan Fu,Jian Yang,Hao Xu,Yang Li,Shaobo Cao,Kang Da,Wenting Chen,Ximei Fan
Doping or constructing heterojunctions by coupling with other semiconductors are effective methods to improve the photocatalytic performance of graphitic carbon nitride (g-C 3 N 4 ) in toluene degradation. Herein, thermally condensed synthesized K-doped g-C 3 N 4 (KCN) is coupled with BiOCl via a hydrothermal method, and KCN/BOC heterostructures are obtained. The optimal KCN 1 /BOC heterojunction exhibits approximately 85% removal of toluene after 150 min irradiation under simulated solar light, which is 12.4 and 9.6 times higher than those of g-C 3 N 4 and BiOCl, respectively. The superior performance of KOH-modified g-C 3 N 4 is attributed to the electron transfer channels formed by the insertion of K + into the g-C 3 N 4 layers, which facilitate efficient charge separation and rapid electron transfer. Furthermore, the KCN/BOC heterostructure with the Z-scheme further improves the surface charge separation efficiency, which plays a critical role in the photocatalytic process. This work provides a facile and promising strategy for dual-strategy modification of g-C 3 N 4 to enhance photocatalytic degradation activity.
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Dajun Zhang,Yufei Ma,Ying Wang,Xiangyu Liu,Mengfan Zhao,Yuanke Wang,Song Gao,Fu Ren,Qing Chen
A new solid-phase extraction agent, IgG@ Fe 3 O 4 -PEI, was successfully developed by conjugating immunoglobulin G (IgG) with amino-functionalized magnetic nanoparticles (Fe 3 O 4 -PEI). The IgG@Fe 3 O 4 -PEI composite was characterized using various techniques including infrared spectroscopy, Raman spectroscopy, magnetic property testing, Zeta potential measurements, energy spectrum analysis, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Because of the presence of a specific binding domain in the Fc fragment of IgG, the IgG@Fe 3 O 4 -PEI composite demonstrated highly selective adsorption of recombinant streptococcal G protein (rSPG) under optimal experimental conditions. At pH 6.0, the IgG@Fe 3 O 4 -PEI composite (0.5 mg) achieved a maximum adsorption efficiency of 93.96 % for rSPG at a concentration of 100 μg mL -1 . Adsorption model simulations indicated that the adsorption behavior followed the Langmuir adsorption model, with a theoretical maximum adsorption capacity of 125.0 mg g -1 . The enriched rSPG was eluted and recovered using Britton-Robinson (BR) buffer at pH 10.0, achieving a recovery efficiency of 95.8 %. In practical applications, the IgG@Fe 3 O 4 -PEI magnetic nanoparticles effectively enriched rSPG from an Escherichia coli expression system, and SDS-PAGE analysis confirmed the successful isolation of highly pure rSPG. Furthermore, the IgG@Fe 3 O 4 -PEI magnetic nanoparticles were used to capture proteins from human serum samples. After enrichment and processing, 430 proteins were identified, including 34 that were undetectable in untreated serum samples. This validated the high sensitivity and specificity of this method in serum proteomics, demonstrating its potential for isolating and identifying low-abundance proteins in complex biological samples. The developed system offers a valuable tool for advancing human serum proteomics research and targeted protein analysis.
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RSC Advances
·
2016
·Vol. 6
·期 58
·52858-52867
·
IF 3.289
Jing Zhang,Xiaoyang Liang,Ying Zhang,Qing Shang
A novel pH-sensitive hydrogel consisting of carboxymethyl chitosan (CMC) and acrylic acid (AA) was fabricated via free radical grafting polymerization. The effective factors on the swelling ratio of the hydrogel were studied. The successful fabrication of the CMC-g-PAA hydrogel was confirmed by Fourier transform infrared spectroscopy (FTIR). The inner morphology of the final hydrogel was observed with scanning electron microscopy (SEM). Insulin (INS) was used as a model drug and encapsulated into the CMC-g-PAA hydrogel. The release profile of the INS loaded-CMC-g-PAA (INS-CMC-g-PAA) hydrogel was obtained in phosphate buffer solution (PBS) at pH 1.2 and 7.4. The hypoglycemic effect of orally administered INS-CMC-g-PAA hydrogel was also studied. SEM photographs showed that the CMC-g-PAA hydrogel had a 3D network structure. In vitro release tests showed that only 16.3 ± 2.6% of INS was released at pH 1.2, while over 93.2 ± 3.8% of INS was diffused into PBS (pH 7.4). This phenomenon illustrated that the INS-CMC-g-PAA hydrogel had a good pH response, and could direct INS to release in basic environments. The animal experiments demonstrated that the oral INS-CMC-g-PAA hydrogel had a persistent and effective hypoglycemic effect. Therefore, the CMC-g-PAA hydrogel has a potential application for the oral delivery of protein drugs.
研究领域:
药剂学
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高分子科学
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药物递送
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生物医学工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Youlan Zou,Haiyan Zou,Zhuoran Ao,Yiyang Lv,Nantao Chen,Yuxing Huang
Notorious shuttle effects and poor electrical conductivity of S have long hindered the commercialization of lithium-sulfur (Li-S) batteries. Herein, N-doped porous carbon coated graphitic carbon nitride heterojunction (g-C 3 N 4 / g-C 3 N 4 @C) composites was prepared by growing g-C 3 N 4 / g-C 3 N 4 heterojunction on the pores of the porous carbon. The effective interface adhesion of g-C 3 N 4 / g-C 3 N 4 heterojunction and high conductive porous carbon served as S host insure the initial specific capacity of 752 mAh/g at 1 C, reversible capacity of 496 mAh/g at 1 C after 400 cycles, and higher rate capacity of 468 mAh/g at 2 C after 500 cycles for Li-S batteries. The mechanism of this ternary synergetic system for enhancement of electrochemical performance is based on effective interface adhesion and conductive property caused by different band energies of g-C 3 N 4 and the N-doped porous carbon.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 47
·17974-17980
·
IF 4
Liqing Li,Xin Deng,Jiani He,Huan Zhang,Li Li,Lihua Zhu
Herein, we report that Pd nanoparticles (NPs) anchored on graphitic nitride carbon (Pd/g-C3N4) catalysts with various Pd contents (1.55 wt%, 0.14 wt%, 0.04 wt%) are successfully prepared via a simple NaBH4 reduction method, exhibiting excellent catalytic activity and selectivity toward 4-aminophenol (4-AP) in 4-nitrophenol (4-NP) selective hydrogenation. 4-NP is completely converted to 4-AP (yield ∼ 100%) under quite moderate reaction conditions (40 °C, 2.0 MPa H2 and 5 min) over the 1.55 wt% Pd/g-C3N4 catalyst, with a high reaction rate r = 134.4 mol4-NP molPd−1 min−1. The excellent catalytic performance can be attributed to the following reasons: (1) a higher ratio of Pd(0)/Pdn+ provides much more exposed active sites for the potential adsorption and activation of the reactants, which is beneficial for increasing the reaction rate and catalytic activity; (2) Pd NPs are highly dispersed on g-C3N4 due to the strong interaction of Pd–N or Pd–C; (3) the interfacial synergism effect between Pd NPs and g-C3N4 enables the effective adsorption and activation of H2 (4-NP) at Pd (g-C3N4), promoting the catalytic hydrogenation of 4-NP and improving their catalytic properties. In addition, this catalyst has superior reusability.
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PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 7
·903-909
·
IF 2.896
Yiming Liu,Yanan Sun,Minli Yang
A new kind of convenient, low-cost double-potential ratiometric ECL sensing platform for the quantification of Cu2+ was developed with carbon nitride nanosheets (g-C3N4 NSs) and graphene quantum dots (GQDs) as ECL luminophores. g-C3N4 NSs mixed with multi-walled carbon nanotubes (MWCNTs) was immobilized on a glass carbon electrode (GCE) and produced strong cathodic ECL at a potential of −1.2 V (vs. Ag/AgCl), while GQDs in the solution gave anodic ECL at +2.5 V. MWCNTs were used here to amplify the ECL signal of g-C3N4 NSs. The addition of Cu2+ causes the cathodic ECL signal from g-C3N4 to decline, while the anodic ECL signal from GQDs remains unchanged. With the anodic ECL signal as an internal reference, a double-potential ratiometric ECL sensing platform for Cu2+ was established. The ratio of the cathodic signal intensity to anodic signal intensity showed a linear response to the Cu2+ concentration over a range from 5.0 × 10−10 to 1.0 × 10−6 mol L−1 and the detection limit was 0.37 nmol L−1 (3σ/S). Such a construction strategy alleviates the interference from the environment and therefore improves the detection accuracy of Cu2+. Compared with other methods for Cu2+ detection, this method is simpler and more sensitive.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Zhaohui Huang,Hui Chen,Lei Zhao,Xuan He,Yingying Du,Wei Fang,Weixin Li,Pan Tian
The development of ultraviolet to near-infrared (UV-Vis-NIR) responsive photocatalysts offers a unique opportunity for the full use of solar energy to solve the energy and the environmental problems. Here, successful preparation of a three-dimensional (3D) porous photocatalyst of graphitic carbon nitride quantum dot (CNQDs) modified g-C 3 N 4 /graphene oxide composite aerogel (CNGO/CNQDs) via hydrothermal and vacuum injection method was reported. In this unique ternary 3D photocatalyst, graphene oxide could improve the separation of photogenerated electrons and holes and promote the charge separation, while the aerogel's 3D network structure provided a rich active site. Simultaneously, due to the appropriate up-conversion performance of the nitrogen carbide quantum dots, CNGO/CNQDs achieved a light response from ultraviolet (UV) to near-infrared (NIR). These properties endow it with a good photocatalytic performance. The hydrogen production efficiency of CNGO/CNQDs reached 1231 μmol h −1 , which was 16 times more than that of matrix material . In addition, the apparent quantum yields (AQY) of CNGO/CNQDs at wavelengths of 420 nm and 700 nm were 13% and 0.116%, respectively.
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高影响因子
Science China-Chemistry
·
2026
·
IF 9.8
Wei Shijiong,Yan Xinrong,Liu Bin,Qiu Dehui,Mergny Jean-Louis,Monchaud David,Zhou Jun,Ju Huangxian
G-quadruplexes (G4s) are important regulatory elements for both genetics and epigenetics. Their biological functions mostly rely on their shapes, as a guanine (G)-rich sequence can fold into G4 structures in more than 20 different ways. This shape governs not only their folding kinetics and stability, but also the way G4s interact with cellular effectors, mostly G4-binding proteins. However, there are still some limitations in the simple and reliable identification of G4 topologies. Herein, we propose a novel method relying on the fast formation of G4 topology-dependent particles upon G4 interaction with colistin (COL): monitoring the number, size and shape of these aggregates using a routine bright-field microscope allows for profiling G4 topology in a reliable, inexpensive and user-friendly manner.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 11
·1-12
·
IF 2.8
Gao Shengqi,He Qin,Yang Qingshan,Wan Songhan,He Xianru
The NBR/G@Fe 3 O 4 composites with good electromagnetic shielding properties are prepared by solution blending, previously, the “G@Fe 3 O 4 composite particles” were obtained by a simple co-precipitation method. The structures of G@Fe 3 O 4 are characterized by Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscopy (Raman), Scanning electron microscopy (SEM), and the graphene content in the composite particles was analyzed by thermogravimetric analysis (TGA). The electromagnetic shielding performance of NBR composites is tested by microwave vector network analyzer. The results show that the average electromagnetic shielding effectiveness of NBR/G@Fe 3 O 4 composites in X-band (8.2–12.4 GHz) can reach 80.4dB, and when the thickness is only 2.1 mm and the filler content is 15 phr can reach 28.2dB, which shield 96.2% of the energy of incident electromagnetic waves. Due to the introduction of magnetic particle Fe 3 O 4 , the NBR/G@Fe 3 O 4 composites have better shielding performance than NBR/G composites at the same graphene content. The electromagnetic shielding effectiveness of NBR/G@Fe 3 O 4 composites with 9.3 phr of graphene is basically the same as that of NBR/G composites with 12.4 phr of graphene.
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高影响因子
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