MICROCHIMICA ACTA
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2021
·Vol. 188
·期 5
·1-9
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IF 5.833
An Xuanxuan,Chen Ruchun,Chen Qizhen,Tan Qin,Pan Shuang,Liu Hui,Hu Xiaoli
A MnO 2 nanosheet-assisted ratiometric fluorescence probe based on carbon quantum dots (CQDs) and o-phenylenediamine (OPD) has been developed for the detection of the anticancer drug 6-mercaptopurine (6-MP). CQDs with strong fluorescence are synthesized via the one-step hydrothermal method. MnO 2 nanosheets as an oxidase-mimicking nanomaterial directly oxidize OPD into 2,3-diaminophenazine (DAP) which has a fluorescence emission at 570 nm, whereas the fluorescence of CQDs at 445 nm is then reduced by the DAP through the inner filter effect (IFE) under a single excitation wavelength (370 nm). After adding 6-MP, MnO 2 nanosheets can be reduced to Mn 2+ and lose their oxidase-like property, blocking the IFE with the fluorescence decrease of DAP and fluorescence increase of CQDs. The novel ratiometric fluorescence probe exhibits considerable sensitivity toward 6-MP and linear response is in the 0.46–100.0 μmol L −1 concentration range with the detection limit of 0.14 μmol L −1 . Furthermore, the probe shows good selectivity when exposed to a series of interfering other organic and inorganic compounds, and biomolecules and can be applied to the detection for 6-MP in human serum samples and pharmaceutical tablets. Satisfactory recoveries of 6-MP in human serum samples are in the range 96.1–110.9% with the RSD of 1.4 to 3.2%. The amount of 6-MP is successfully estimated as 49.3 mg in pharmaceutical tablet with the RSD of about 2.2%. Graphical abstract
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高影响因子
FIBERS AND POLYMERS
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2013
·Vol. 14
·期 1
·8-15
·
IF 0.912
Xu Feng,Jamal Ruxangul,Ubul Aminam,Shao Weiwei,Abdiryim Tursun
The composites of copolymers of aniline (An) and o -methoxyaniline (OMA) with multi-walled carbon nanotubes, named as copolymers/MWNT, (poly(An-co-OMA)/MWNT) were prepared by solid-state synthesis method at room temperature. The homopolymers/MWNT composites were synthesized for comparison. The structure and morphology of these composites were characterized by FT-IR spectroscopy, UV-Vis absorption spectroscopy, X-ray diffraction (XRD) and TEM. The electrochemical performances of the composites were investigated by galvanostatic charge-discharge, cyclic voltammetry (CV) and cycle life measurements. The results from FT-IR and UV-Vis spectra showed that different molar ratio of [An]/[OMA] in reaction system has great influence on the oxidation degree, conjugation length and doping level of the copolymers in these composites. The presence of MWNT in the composites was confirmed from the characteristic peaks of MWNT in XRD patterns and the enwrapped MWNT in TEM images. The TEM images further indicates that the MWNT uniformly distributed and enwrapped with polymer in the case of composite from molar ratio of [An]/[OMA]=1:1. The results also showed that the morphology, crystallinity and solubility of composites were highly affected by the incorporation of OMA unit copolymer chain. The results from electrochemical performances suggested that the molar ratio of [An]/[OMA]=3:1 in reaction system can make the obtained composites displayed a higher specific capacitance, good rate ability and cycling stability.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Dandan Han,Jialin Geng,Jingze Luan,Weiwei Jian,Lin Wu
Manganese-based oxides are promising cathodes for aqueous zinc-ion batteries but often suffer from structural instability, manganese dissolution, and poor conductivity. Herein, we propose a "dual-network synergistic construction" strategy through the in-situ derivation of a metal–organic framework to concurrently address these challenges. This strategy ingeniously constructs an oxygen-deficient network and a conductive carbon network within a hierarchical Mn₂O₃/C composite (O d -Mn₂O₃/C-400). The formed interfacial Mn–O–C bonds effectively enhance structural integrity and regulate the concentration of oxygen vacancies. As a cathode for aqueous zinc-ion batteries, the O d -Mn₂O₃/C-400 composite demonstrates exceptional electrochemical performance, delivering a remarkable specific capacity of 425 mAh·g⁻¹ at 3 A·g⁻¹. More importantly, it exhibits outstanding long-term cyclability, retaining 87.67% of its capacity (174 mAh·g⁻¹) after 5,000 cycles at a high current density of 5 A·g⁻¹. When configured into a zinc-ion hybrid supercapacitor (O d -Mn₂O₃/C-400//AC), the device achieves a high energy density of 119 Wh·kg⁻¹ at 189 W·kg⁻¹, and maintains 78.6% capacity retention with 97.5% Coulombic efficiency over 3,000 cycles. This work provides an effective material design paradigm for developing high-performance manganese-based electrodes for advanced energy storage systems.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Jie Meng,Ying Wang,Li-Yang Shao,Tian-Shu He,Jiao-Na Yue,Bo-Lin Sun,Quan-Guo Zhai
The rational control of heterostructure motifs and the corresponding electronic environment in heterocatalysts offers an effective strategy to regulate CO2RR selectivity, yet it remains challenging. The precise regulation of the reaction intermediates is therefore a critical determinant. In this work, the size-engineered cMOF/o-Cu2O was introduced to modulate heterostructure motifs, thereby modulating the *CHO intermediate selectivity switch and steering C2 or C1 reaction pathways. We elucidated the divergent CO2RR pathways governed by the differential growth degrees of the cMOF/o-Cu2O heterostructures. The minimized cMOF/o-Cu2O-s (∼361.8 nm), comprising a high proportion of –OH terminations, accelerated the continuous hydrogenation of *CHO and promoted their conversion into *CHxO intermediates. The moderate cMOF/o-Cu2O-m (∼870.1 nm) achieved an optimal balance between the intermediate concentrations and interfacial transfer, enabling a preferential *CHO–*CO coupling pathway through the rationally designed heterostructure motifs. In contrast, the enlarged cMOF/o-Cu2O-l (∼2.7 µm) exhibited an indistinguishable force toward the key intermediates of *CHO, thereby failing to differentiate between the subsequent reaction pathways. The intensified *CHxO and *CHO–*CO signals observed in the in situ ATR-FTIR further verified the bifurcated reaction pathways, featuring a C1-dominated pathway on cMOF/o-Cu2O-s and C2 pathway on cMOF/o-Cu2O-m. cMOF/o-Cu2O-m achieved a Faraday efficiency of 71.1% for C2 products at −1.3 V vs. RHE. This work offers crucial insights into the significance of size engineering in modulating the heterostructure motifs to regulate the selectivity switch of key intermediates.
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HIGH PERFORMANCE POLYMERS
·
2017
·
IF 1.179
Lala Rukh Sidra,Nafeesa Mushtaq,Guofei Chen,Xingzhong Fang
A series of poly(N-arylene benzimidazole ether imide) copolymers PEIBIs were prepared from 1H,3′H-5,5′-bis-benzimidazole, bisphenol-A and 4,4′-bis(4-fluorophthalimido)diphenyl ether by nucleophilic displacement polymerization. The resulting copolymers PEIBI(10–90) demonstrated moderate to good solubility in polar aprotic solvents and high glass transition temperatures (Tgs) of 228–336°C, good thermal stability with 10% weight loss temperatures in the range of 503–548°C. All copolymer films showed good mechanical properties with tensile strengths of 101–130 MPa, tensile moduli of 3.3–4.0 GPa, elongations at break of 5–7%, and also presented low water uptake (0.15–0.34%). The wide-angle X-ray diffraction results revealed the amorphous nature of copolymers. The copolymer PEIBI-80 showed good balance in solubility, thermal and mechanical properties.
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APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Lin Zhu,Chenglong Ma,Zhiqiang Wang,Xueqing Gong,Limei Cao,Ji Yang
Developing high-active, stable, and cost-efficient electrocatalysts for oxygen evolution reaction (OER) is urgent task in water splitting. Recently, iridium pyrochlores (A 2 Ir 2 O 7 ) have attracted broad attention as promising catalysts due to their unique electronic properties and the less iridium content relative to IrO 2 , while in iridium pyrochlores, the relatively high concentration of oxygen vacancies decreases the Ir-O hybridization, hindering the OER process. The electronic states of iridium-based pyrochlore M 2 Ir 2 O 7 (M = Lu, Pr) are rationally tuned through partial substitution in A-site of Zn 2+ for Lu 3+ or Pr 3+ , efficiently promoting its intrinsic activity. The optimal Pr 1.8 Zn 0.2 Ir 2 O 7 and Lu 1.8 Zn 0.2 Ir 2 O 7 electrocatalysts exhibit 114.6 and 135.32 A g Ir −1 high mass activity at 1.58 V vs. RHE. Combining X-ray absorption spectrum with DFT calculations , we demonstrate that the doping of Zn 2+ reduces the defective oxygen and regulates the electron distribution . The decrease of defective oxygen leads to the O-2p band center upshift, resulting in the Ir–O covalency promotion and the decrease of the binding energy between oxygen intermediates and Ir to accelerate the OER process. This work provides a fresh idea introducing small ionic radius Zn to solve the problem of high concentration of oxygen vacancies inevitably produced in the synthesis of pyrochlores.
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Cell and Bioscience
·
2025
·Vol. 15
·期 1
·159
·
IF 6.2
Sun Weikang,Zhang Mengyu,Wang Ruilin,Yang Jie,Rasool Ameena Tur,Luo Renjie,Liu Xiangdong,Cao Peng,Li Erguang
Background The RNA-binding protein polypyrimidine tract-binding protein 1 (PTBP1), also known as heterogeneous nuclear ribonucleoprotein I (hnRNP I), mediates gene expression through splicing regulation. Its role in virus infection is undefined. Results We show that genetic ablation of PTBP1 renders cell resistant to herpes simplex virus 1 (HSV-1) infection. HSV-1 utilizes 3-O-sulfated heparan sulfate proteoglycans (HSPGs) for attachment and for infection of epithelial cells. We found that knockout of PTBP1 expression resulted in loss of HS3ST3A1 and HS3ST3B1, heparan sulfate glucosaminyl 3-O-sulfotransferase genes for 3-O-sulfation of the heparan sulfate (HS) chains of HSPGs. Each of the HS3ST3A1/HS3ST3B1 genes is composed of 2 exons separated by an extraordinarily long intron whose removal requires PTBP1-associated looping. We found that PTBP1 interacted with the intronic region of HS3ST3A1/HS3ST3B1 pre-mRNAs and modulated their processing to mRNA. The essential role of PTBP1 in functional HS3ST3A1 expression and in HSV-1 infection was demonstrated by ectopic re-expression in the knockout (ko) cells. In addition, we showed that targeting PTBP1 expression by microRNA mimics reduced disease symptoms in a mouse herpetic stromal keratitis (HSK) model. Conclusions The results demonstrate that PTBP1 mediates HSV-1 infection of epithelial cells through splicing regulation of HS3ST3A1/HS3ST3B1. These studies provide a new area for novel therapeutic strategies through splicing regulation. Graphical abstract By Sun et al. RNA-binding protein PTBP1 mediates HSV-1 attachment and infection through regulation of heparan sulfate 3-O-sulfotransferase gene expression.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xianghai Song,Xin Li,Xinyu Zhang,Yuanfeng Wu,Changchang Ma,Pengwei Huo,Yongsheng Yan
Photocatalytic reduction of CO 2 to hydrocarbon fuels is an ultimate and utmost strategy to resolve the ever-increasing environmental problems and energy crisis. Our study aimed to develop a specific type of photocatalysts with increasing light utilization efficiency, reducing electron-hole recombination rate and enhancing photocatalytic activity by integrating unique donor-acceptor systems into the polymeric network of graphitic carbon nitride (g-CN). The results of the characterization showed that C and O are successfully integrated into the framework of g-CN. The O-containing and C-containing section of the as-prepared catalysts (OCCNx) play the role of donor and acceptor, respectively. The donor-acceptor systems of OCCN x offer an extra electron transfer transition mode, which dramatically extends the optical absorption range, and narrows down the bandgap of g-CN from 2.74 to 2.03 eV. Also, the donor-acceptor systems significantly improve the delocalized ability of the photoinduced charge carriers, which efficiently prolongs the lifetime of the charge carriers and reduces the electron-hole recombination rate, as all of these are all beneficial for boosting the photocatalytic activity of the catalysts. Experimental results show that OCCN 0.25 displays the best photocatalytic CO 2 reduction performance with a CO production rate of 34.97 μmol g −1 in 4 h, which is 4.3-fold higher than that obtained in the case of bulk g-CN. Moreover, the reaction is performed in water without any co-catalyst and sacrificial agent, which makes it a green and environmentally friendly reaction. Results obtained from DFT simulation agree well with the empirical results, and a possible reaction mechanism is suggested based on these calculations.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
·
IF 5.8
Yang-Yang Xu,Xing Fan,Feng-Yun Ma,Hai-Xu Zou,Xian-Yong Wei
Directly converting lignite into arenes as commodity chemicals and drop-in fuels is a highly desirable target for researchers. However, this is severely limited by the presence of stable inter unit C-O linkages in lignite. Herein, a highly active catalyst, Co-MoS 2 , has been designed and prepared to be used for the selective catalytic cleavage of inter unit C-O bridged bonds (BBs) in the conversion of Naomaohu (NMH), a lignite, to yield arenes. Both catalytic hydrogenation conversion (CHC) and thermal dissolution (a non-catalytic process, named NCHC) of NMH were conducted using n-hexane as the solvent. The soluble fractions from the first stage of NCHC (SF NCHC-1 ) and CHC (SF CHC-1 ), as well as the second stage of NCHC (SF NCHC-2 ) and CHC (SF CHC-2 ) were obtained using the same solvent. After the first-stage catalytic treatment, the relative contents of arenes and alkanes in SF CHC-1 increased by 16.7 % and 9.3 %, respectively, compared to those in SF NCHC-1 , and the relative content of oxygen-containing compounds (OCCs), such as alcohols, phenols , esters, ketones , acids, and furans, decreased by 13.2 %. For the second-stage conversion, the relative contents of arenes and alkanes in SF CHC-2 were 53.5 % and 15.5 % higher than those in SF NCHC-2 , and the relative contents of OCCs was only 6.6 % in SF CHC-2 . The catalytic mechanisms of cleavage of C-O BBs and deoxygenation were proposed based on the CHC of model compounds and density functional theory (DFT) calculation. The adsorption of OCCs and the activation of released hydrogen radical (H·) by Co-MoS 2 , followed by H· addition to the carbon atom connected to oxygen in C-O BBs and oxygen-containing functional groups, are crucial for the cleavage of C-O BBs and formation of deoxygenated compounds, particularly arenes.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Huating Huang,Weiqing Li,Xixi Chen,Zhiming Yang,Minggang Chen,Anhong Zhang,Chun He,Shuanghong Tian
The strong metal–support interaction (MSI) has been widely attributed to enhanced catalytic activity. However, this attribution might be wrong in catalytic ozonation, since MSI that is too strong might impede the activation of electron-poor ozone molecules. Herein, we reported a strategy to subtly modulate the Mn–O–Si interaction by intercalating the carbon film between the silica support and active manganese oxide. When using MnOx/0.5C/SiO2 with the moderate MSI as a catalyst in the catalytic ozonation of refractory paracetamol (PCM), 91.1 ± 2.4% of PCM was removed within 30 min, about 30% higher than that using the catalyst of MnOx/SiO2 with a strong MSI. Moreover, the reaction rate reached 8.01 × 10–2 min–1, 2.2 and 1.3 times that with MnOx/SiO2 and MnOx/1C/SiO2, respectively. Importantly, further integration of MnOx/0.5C/SiO2 into membrane filtration achieved high rejections of PCM (>94.3%) under various realistic water scenarios during a continuous 12 h operation, demonstrating strong resistance to environmental matrices interference. Experimental and theoretical evidence revealed that the moderate MSI resulted in the high dispersion of active MnOx nanoclusters in the size of 2.3–4.4 nm and promoted the adsorption of ozone over MnOx and its dissociation into surface *O, •OH, •O2–, and 1O2 for decontamination. As a constructive work, this study revealed the significance of MSI in catalytic ozonation and offered a simple regulation method for constructing active interfaces of metal-supported catalysts.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jinnuo Yang,Wenqiang Ai,Lingke Li,Shilong Dong,Jiahui Lv,Ruiqi Wang,Yang Liu,Lei Zu,Huiqin Lian
Sodium-ion batteries (SIBs) offer great viability for extensive energy storage due to their abundance, low cost, and excellent safety. In this study, we investigate the relationship between P–O–C bonds content and electrochemical performance of black phosphorus–hard carbon–carbon nanotubes (BP-HC-CNTs) composite anode. A series of composites are prepared via ball milling, in which the relative P–O–C bonds content is modulated by varying the HC to CNTs ratio, and the effect of different relative P–O–C bond contents on the electrochemical performance of the materials is systematically investigated. The findings indicate that tuning the HC to CNTs ratio alters the chemical bonding degree between phosphorus and carbon, specifically the P–O–C bond content, which positively correlates with enhanced electrochemical performance. Notably, the composite with the highest P–O–C content (36 %) exhibits superior performance compared to those with lower bond contents: The specific capacity is approximately 2.9 times higher after 600 cycles at 6.0 A g ⁻¹ , and after 2000 cycles at 15.0 A g ⁻¹ , it is about 5.7 times higher. These results demonstrate excellent rate capability and cycling stability. Therefore, we propose that adjusting the hard carbon/carbon nanotubes ratio effectively regulates P–O–C bonds formation, which is essential for improving interfacial stability and electrochemical kinetics.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2024
·
IF 2.2
Lin Jia,Wang Shuai,Jin Hua,Wang Rongwen,Cui Shuyuan,Yang Yihang,Wang Jinhuo,Huang Guimei
Ceramic parts with complex structures can be manufactured by three-dimensional (3D) printing technology. However, the ceramic raw materials available for 3D printing are very limited. This paper mainly focuses on the selection, composition, and proportion optimization of ceramic precursor systems. The optimal photoinitiator was selected by comparing the ultraviolet absorption bands of 2,2-dimethoxy-2-phenylacetophenone), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (819) photoinitiators. In addition, the effects of different photoinitiators on system reactions and curing efficiency were considered, and the content of photoinitiators was optimized based on actual conditions. The mercapto-to-vinyl ratio was optimized to obtain Si-O-C-based ceramic raw materials that could be used for photo-curing 3D printing by comparing the ceramic yield, size shrinkage, and mechanical properties.
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