NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Miao Wang,Feixiang Ding,Yuren Zhao,Ge Xu
Conventional graphitic carbon nitride (g-C3N4) suffers from rapid complexation of photogenerated charge carriers and limited visible-light absorption. To address these issues, this study aims to construct an intramolecular donor–acceptor system within g-C3N4 to precisely modulate its electronic structure and enhance photocatalytic performance. A novel carbon nitride-based composite photocatalyst (CN-abIM9mg) was synthesized via a two-step thermal condensation method using 2-aminobenzimidazole (abIM) as a dopant. The ultratrace doped donor provides an electron transfer mode requiring lower energy, which narrows the band gap of g-C3N4 from 2.79 eV to 2.70 eV and expands the absorption capability to visible light. Furthermore, CN-abIM9mg has a specific surface area of 112.215 m2 g−1, which is 3.5 times higher than that of g-C3N4 (32.156 m2 g−1), supplying more photocatalytic active sites. A possible mechanism was proposed based on characterization using X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, and density functional theory simulation calculations. In addition to the π–π* transition originating from the pristine g-C3N4, the occurrence of n–π* electronic transition within the donor–acceptor system enhanced the delocalization ability of the photogenerated charge carriers. The synergistic effects of improved light absorption, efficient charge separation, and increased surface area endow CN-abIM9mg with high photocatalytic activity, leading to a 98.8% degradation rate for Rhodamine B under visible light, with a reaction rate constant 4.9 times that of pure g-C3N4. This work provides profound molecular-level insights into enhancing photocatalytic activity through n–π* transition promotion in donor–acceptor-structured polymers.
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DOI
高影响因子
Small
·
2024
·Vol. 20
·期 32
·2312003
·
IF 13
Mohammad Nisar,Adeel Abbas,Junze Zhang,Fu Li,Zhuanghao Zheng,Guangxing Liang,Ping Fan,Yue-Xing Chen
Enhancing the thermoelectric performance of n-type polycrystalline SnSe is essential, addressing challenges posed by elevated thermal conductivity and compromised power factor inherent in its intrinsic p-type characteristics. This investigation utilized solid-state reactions and spark plasma sintering techniques for the synthesis of n-type SnSe. A significant improvement in the figure of merit (ZT) is achieved through strategic reduction in Se concentration and optimization of crystal orientation. The co-doping with Br and Ge further improves the material; Br amplifies carrier concentration, enhancing electrical conductivity, while Ge introduces effective phonon scattering centers. In the Br/Ge co-doped SnSe sample, thermal conductivity dropped to 0.38 Wm⁻¹K⁻¹, yielding a remarkable power factor of 662 µW mK − 2 at 773 K, culminating in a ZT of 1.34. This signifies a noteworthy 605% improvement over the pristine sample, underscoring the pivotal role of Ge doping in enhancing n-type material thermoelectric properties. The enhancement is attributed to Br doping introducing additional electronic states near the valence band, and Ge doping modifying the band structure, fostering resonant states near the conduction band. The Br/Ge co-doping further transforms the band structure, influencing electrical conductivity, Seebeck coefficient, and thermal conductivity, advancing the understanding and application of n-type SnSe materials for superior thermoelectric performance.
研究领域:
材料科学
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热电材料
·
固体物理
·
凝聚态物理
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yang Wang,Lei Zhang
In order to eliminate multiple coexisting pollutants in environmental wastewater, a magnetic three-dimensional hierarchical porous flower-like N, Co-doped graphitic carbon nano-polyhedra decorated NiCo-layered double oxides (N-Co@C/NiCo-LDOs) adsorption material was synthesized, which consisted of two-dimensional LDOs nanosheets with functionalized surfaces (N, Co-doped graphitic carbon loaded on both sides of NiCo-LDOs nanosheets). The adsorption properties of N-Co@C/NiCo-LDOs for five types of typical pollutants (cationic dyes: rhodamine b, methylene blue ; pesticides: ethofenprox, bifenthrin ; anionic dyes: methyl orange, congo red; inorganic cations : Cr 2+ , Cd 2+ , Pb 2+ , Zn 2+ , inorganic anions : Cr 2 O 7 2− , AsO 3 3− ) were investigated systematically in single and coexisting systems. Combined with the results of FTIR and zeta potential , the adsorption mechanism was discussed. By virtue of its hierarchical porous architecture and the combined effect of functionalized surfaces and LODs supporter, the as-prepared N-Co@C/NiCo-LDOs demonstrates excellent adsorption performance towards five types of typical pollutants with fast adsorption rate, high adsorption capacity and good co-adsorption performance. More importantly, the N-Co@C/NiCo-LDOs showed satisfactory removal efficiency, stability and reusability in model wastewater. The broad-spectrum, rapid, easily separable, and reusable adsorption properties make N-Co@C/NiCo-LDOs promising for highly efficient wastewater treatments . This work also provides a feasible way for the preparation of adsorption materials for the treatment of complex wastewater systems.
研究领域:
环境科学
·
材料科学
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Lin Yao,Lili Zhang,Bingwen Long,Yafen Dai,Yigang Ding
Three inexpensive N-heterocyclic hyper-cross-linked polymers (HCP-IN, HCP-BZD, and HCP-BTA) were successfully prepared by Friedel−Crafts reaction for the removal of organic pollutants from aqueous solution. Five organic pollutants, i.e., 1-naphthol (1-NO), 4-nitrophenol (4-NP), 4-chlorophenol (4-CP), 2,4-dimethylphenol (2,4-DMP), and phenol were selected. Because of high specific surface area (1023 m 2 /g), micropore specific surface area (622 m 2 /g), and good wetting ability, HCP-BTA showed ultra-fast adsorption. Its adsorption capacity can reach up to 490.9 mg/g for 1-NO, 363.2 mg/g for 4-NP, 345.8 mg/g for 4-CP, 310.4 mg/g for 2,4-DMP, and 18,130.9 mg/g for phenol, within 1 min. The process was exothermic, and Δ H had an order of 1-NO (−116.23 kJ/mol) > 2,4-DMP (−89.26 kJ/mol) > 4-NP (−59.74 kJ/mol) > 4-CP (−41.12 kJ/mol) > phenol (−18.61 kJ/mol). The adsorption mechanism was explored as well. Hydrogen bonding , π–π stacking, and hydrophobic interaction might be the significant interactions for the adsorption. Besides, HCP-BTA can be easily regenerated, and the capacity after five cycles still remained 90% of the first adsorption. Above all, the N-heterocyclic hyper-cross-linked polymers may be the promising candidate for the removal of organic pollutants from aqueous solution.
研究领域:
环境科学
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材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Hao Qin,Hui Wan,Guofeng Guan
Hydroisomerization of n-alkanes plays an important role in fuel and lubricants processing. Bifunctional catalysts with ultralow platinum loading have recently been reported successively for hydroisomerisation. Herein, the catalysts were prepared successfully with different methods to improve the catalytic performance. The conversion of 0.01%Pt1@CeOx/SAPO-11 prepared by co-calcination method (0.01%Pt1@CS-c) is 71.4%, 25% higher than the other prepared by precipitation method. The turnover frequency per active surface platinum site (TOFPt) of 0.01%Pt1@CS-c is as high as 13115 h –1 . Revealed by the X-ray photoelectron spectroscopy (XPS) results, the quality of phase boundary/intersurface between ceria and zeolite is found significantly different. The conjunction quality of phase boundary directly affects the spillover rate of intermediate species, which further leads to an apparent activity difference. In addition, the possible role of ceria in the reaction is discussed, rather than just as a carrier for the active metal atoms.
研究领域:
催化化学
·
能源材料科学
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DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Chenxi Gu,Liyan Yang,Susu Han,Dengfeng Yang,Xiaodong Xu,WenChao Zhang,Mingguo Jiang,Lixia Pan
Cold-active chitinases that maintain robust catalytic performance at low temperatures are gaining attention as eco-friendly biocatalysts for energy-saving bioprocesses. In this study, a novel multifunctional chitinase of GH18 ( Cm Chi18B) was successfully cloned from a newly identified mangrove-associated bacterium Chitinibacter mangrovi FCG-7 T in Escherichia coli . The enzyme Cm Chi18B demonstrated adaptability to cold environments, retaining 55% of its maximal activity at 0°C. It displayed optimal activity at 55°C and pH 5.5. Cm Chi18B demonstrated high activity across a broad pH range of 4.0-12.0. Substrate hydrolysis analysis indicated that Cm Chi18B possesses bi-functional capabilities, including exochitinase and N-acetyl-β-D-glucosaminidase activities. After 24 h of incubation with colloidal chitin at 30°C, the enzyme achieved a N-acetyl-D-glucosamine (GlcNAc) conversion rate of 91.15% with a purity exceeding 98%. Intriguingly, the hydrolysis time for GlcNAc production varied with temperatures, with 0°C significantly impairing N-acetyl-β-glucosaminidase activity. These attributes position Cm Chi18B as a promising, low-energy biocatalyst for the sustainable production of GlcNAc and the valorization of chitin waste streams.
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DOI
高影响因子
iScience
·
2022
·
IF 6.107
Kefeng Wang,Qingzhen Yu,Wenli Mao,Yuxin Zheng,Jing Xu,Yukun Wang
Vinylboron compounds are important compounds in organic chemistry and biology. In this communication, we developed a copper(I)-catalyzed, highly regio- and stereoselective radical trans -hydroboration of ynamides with N -heterocyclic carbene (NHC)-ligated borane is reported, which leads to a series of trans -boryl enmides that can be conveniently transformed into various multi-substituted enamides. Further investigation showcased that our method is robust and scalable. The mechanism of this unique reaction is studied and discussed.
研究领域:
有机化学
·
合成化学
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DOI
PubMed
高影响因子
Macromolecular Reaction Engineering
·
2024
·
IF 1.8
Shoucun Zhang,Shengyan Wang,Wenli Wu,Jinlong Wu,Jianghua Du
Liquid carbon dioxide (LCO 2 ) or supercritical carbon dioxide (ScCO 2 ) can be used as an important solvent medium for preparing polymer particles through dispersion polymerization. However, based on the weak solvent characteristics of CO 2 , the development of stabilizers used in dispersion polymerization has always been an important challenge. These stabilizers are progressing toward the low-cost, pollution-free, and simple synthesis routes, et al. In this research, pentaerythritol tetra (3-mercaptopropionate) (PTMP) is used to control the homopolymerization or copolymerization of vinyl acetate (VAc)/vinyl propionate (VPr), the homopolymers or copolymers with thiol group are synthesized by the one-pot method. These homopolymers or copolymers are used as the stabilizers to stabilize the dispersion polymerization of N -vinyl-2-pyrrolidone (NVP) in ScCO 2 . The results show that the structural unit proportion of the stabilizers, the concentration of stabilizers or 2, 2´-azobis(isobutyronitrile) (AIBN), and the time interval for dispersion polymerization have significant impacts on the conversion percentage of NVP and the molecular weight of polymers. The maximum conversion percentage of NVP can get to 95%, and the molecular weight of poly( N -vinyl-2-pyrrolidone)(PNVP) can reach 22.3 kPa. SEM analysis indicates that the PNVP obtained has regular spherical characteristics.
研究领域:
高分子化学
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材料科学
·
绿色化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 4
·915-922
·
IF 3.637
Wu Zhi-Wei,Xie Xing-Chen,Guo Hong-Ran,Xia Huan,Huang Ke-Jing
A tetrahedral DNA probe can effectively overcome the steric effects of a single-stranded probe to obtain well-controlled density and minimize nonspecific adsorption. Herein, a highly sensitive electrochemical biosensor is fabricated for determination of protein using a tetrahedral DNA probe and rolling circle amplification (RCA). N- and P-co-doped graphene (NP-rGO) is prepared, and AuNPs are then electrodeposited on it for DNA probe immobilization. Benefitting from the synergistic effects of the excellent electrical conductivity of NP-rGO, the stability of the tetrahedral DNA probe and the signal amplification of RCA, the biosensor achieves a low limit of 3.53 × 10 −14 M for thrombin and a wide linear range from 1 × 10 −13 to 1 × 10 −7 M. This study provides a sensitive and effective method for the detection of protein in peripheral biofluids, and paves the way for future clinical diagnostics and treatment of disease.
Graphical abstract
研究领域:
生物化学
·
分析化学
·
生物传感器
·
分子诊断
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DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Pandong Ma,Yubing Li,Hexun Zhou,Mengheng Wang,Mengsi Zhu,Yaoyao Han,Xin Zhang,Kang Cheng,Abhishek Dutta Chowdhury
The unique physicochemical properties of “redox-acid” bifunctional zeolites make them an essential tool in the petrochemical industry, especially in the hydro-conversion of linear alkanes to deliver high-octane fuels. The current research activities in this domain are primarily tailored towards evaluating the “intimacy/proximity” criteria among two catalytically active sites and minimizing the loading of noble metals (e.g., Pd or Pt) in catalysis. However, the chemistry behind the communication mode (i.e., “through-space” or “through-bond” interaction between metallic and acid sites) has remained vastly underexplored during the hydro-conversion of n-alkanes over Pt or Pd/zeolites. To dig deeper into this uncharted territory, this work demonstrates that both “through-space” (cf. metals in extra-framework position in/on zeolite) and “through-bond” (cf. metals on the zeolite framework) bifunctionality favors the hydroisomerization step, while the later partially also promote the hydro-cracking. Their working protocol was probed by the diverse material characterization techniques that improved the understanding of the zeolite-catalyzed hydrocarbon conversion processes.
研究领域:
催化化学
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石油化学
·
材料科学
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DOI
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 19
·4027-4035
·
IF 4.726
Xiang Zheng,Tingbin Zhang,Xiaoyan Song,Ling Zhang,Chunqiu Zhang,Shubin Jin,Jinfeng Xing,Xing-Jie Liang
Cationic polymers (polycations) are promising gene vectors that are conveniently synthesized and easily modified. In order to study the relationship between structures and properties of the polycations in gene delivery, a graft copolymer called poly(N-vinylpyrrolidone)-g-poly(2-dimethylaminoethyl methacrylate) (PVP-g-PDMAEMA, i.e. PgP) and a block copolymer called PVP-b-PDMAEMA (PbP) with equal molecular weight of PDMAEMA and PVP were prepared by two advanced living radical polymerization reactions including atom transfer radical polymerization (ATRP) and reversible addition-fragmentation chain transfer (RAFT) techniques. Compared with PbP, PgP could condense pDNA more effectively into polyplexes with smaller size, higher zeta potential and better stability. The transfection efficiency of PgP at a low N/P ratio of 4 : 1 was not only higher than that of PbP, but also much higher than that of the commercially available PEI as the gold standard of polycations and lipofectamine. In addition, both PgP and PbP had less BSA absorption compared with PEI, indicating that PVP could resist BSA absorption. In order to understand the mechanism behind the high transfection efficiency of PgP, cellular uptake and endosomal escape of PgP/pDNA and PbP/pDNA polyplexes were investigated. The results demonstrated that the improvement of the transfection efficiency of PgP originated from the promotion of the cellular uptake and endosome/lysosome escape. This study will provide useful information on designing effective non-viral vectors for gene delivery.
研究领域:
生物材料学
·
分子生物学
·
基因治疗
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2020
·Vol. 58
·期 8
·687-694
·
IF 1.28
Ummiti Kumarswamy,Kumar J V Shanmukha
Ganirelix is a synthetic decapeptide linked with nine different amino acids. To understand the peptide amino acid sequence or primary structure, the first step is to determine the amino acid composition of the peptide which can be a determining factor for the peptide immunogenicity. Edman degradation is not a suitable analytical technique to identify amino acid sequence present in Ganirelix due to the absence of uncharged N-terminal amino group. To address this challenge, a pre-column derivatization method was developed with 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate reagent. In the present work, the Ganirelix active pharmaceutical ingredient present in the injectable formulation was isolated by fraction collection and further purified by flash chromatography. The amino acid composition of Ganirelix is assayed by carrying out acid hydrolysis with 6 mol L−1 hydrochloric acid solution containing 1% phenol at 100°C for 24 h and derivatization with 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate reagent solution, followed by determination of individual amino acids by reverse-phase chromatography using a C18 column. High resolution was achieved for the nine amino acid mixture. The amino acid composition results of temperature-stressed Ganirelix generic product and reference listed drug are in good agreement with the theoretical molar ratio of label information.
研究领域:
分析化学
·
生物化学
·
药物分析
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DOI
高影响因子
危险品化学品经营许可证（带存储）