CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Weiwen Wang,Hui Zhao,Peng Pan,Kang Xue,Zisheng Zhang,Jihai Duan
In order to enhance the photocatalytic activity of TiO 2 under visible light, Ag nanoparticles were introduced into tridoped B–C–N–TiO 2 (TT) catalyst by photoreduction deposition. Ag/B–C–N–TiO 2 (ATT) catalysts with the functions of reducing band gap and carrier recombination were prepared. At the same time, the effect of the amount of Ag on the photocatalytic performance of ATT catalyst was investigated. Through XRD , XPS , PL and other characterization methods, the (211)/(101)/Ag interface heterojunction mechanism similar to the traditional Z-scheme heterojunction was proposed. The intervention of Ag nanoparticles changed the P–N interface heterojunction between (211)/(101) to the (211)/(101)/Ag Z-scheme interface heterojunction. The results show that ATT catalyst exhibits the highest photocatalytic activity when the molar amount of Ag is 0.005% with the MB degradation rate of the ATT catalyst (0.01707 min −1 ), which is 14.59 times of TiO 2 (0.00117 min −1 ) and 2.02 times of TT (0.00847 min −1 ). In addition, the four cycles efficiencies of ATT for MB degradation were all above 94.00%.This study reveals the possibility of construction of Z-scheme heterojunctions between precious metal nanoparticles and different interfaces of TiO 2 , and provides a reference for the construction of Z-scheme interface heterojunctions.
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COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 299
·期 4
·663-674
·
IF 1.536
Xia Yunfei,Xu Xiuhang,Yu Haihua,Zhou Chuan,Nie Zhenzhou,Yang Jianfeng,Qian Jiajia,Ni Henmei
Zwitterionic microspheres of poly2-(dimethylamino) ethyl methacrylate (PDMAEMA) block polymethacrylic acid (MAA) were prepared by RAFT dispersion polymerization in alcohols. 4-Cyano-4-(phenylcarbonothioylthio) pentanoic acid (CPDB) was used as the RAFT agent. 2,2′-Azobis(2,4-dimethyl) valeronitrile (V65) was used as the initiator, and PDMAEMA-CPDB was used as the macro-chain transfer agent (CTA). 1 HNMR was applied to determine the polymerization degrees of both PDMAEMA-CTA and PDMAEMA-b-PMAA. SEM, dynamic light scattering (DLS), and small-angle X-ray diffraction (SAX) were employed to characterize the microspheres. It was observed that the polarity of alcohols impacted the partition of MAA and V65 between the mini-droplets of PDMAEMA-CTA/MAA complexes and the continuous phase, thereby affected on the diameters of microspheres, the total conversion of MAA, and the polymerization degree of PMAA in the copolymers. For example, in methanol, the smallest diameter and polymerization degree of PMAA in the block copolymers were obtained, whereas the total conversion of MAA of the RAFT polymerization system was the highest. Most of RAFT polymerization of MAA occurred nearby PDMAEMA-CTA chains; thus, PDMAEMA-CTA acted as a template to regulate the length of PMAA in the copolymers. pH-sensitive characteristics of microspheres were dependent to the extra length of PDMAEMA-CTA, i.e., the difference of lengths between two blocks. When the length of PMAA was too short, e.g., PDMAEMA 600 -b-PMAA 87 , or the length of PMAA was closed to that of PDMAEMA, e.g., PDMAEMA 79 -b-PMAA 93 and PDMAEMA 102 -b-PMAA 131 , the amphoteric characteristics of microspheres disappeared. The self-assembly behavior of diblock copolymers in KCl alcohol-water solution was also determined by the extra length of PDMAEMA. Microspheres turned into nanofibers or nano-ribbons, but for PDMAEMA 600 -b-PMAA 87 , the microspheres maintained their original spheric morphology. These results indicated that the charge-screening effects of salts played the key roles in the self-assembly.
Graphical abstract
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 4
·719-725
·
IF 0.64
Zhang Chenxu,Wu Xiangfeng,Jia Yunning,Chang Tianlong,Liu Zhifeng,Fu Yunxuan,Liu Xutao,Wang Hui,Shi Yimai,Zuo Yuqian
The SnO 2 quantum dots (SnO 2 QDs)/ZnS nanosheets (ZnSNs) heterojunction was fabricated via an in-situ synthetic method at room temperature. Rhodamine B, potassium dichromate, and tetracycline were used to discuss the photocatalytic activities of the as-prepared samples under the visible light illumination. The photocatalytic mechanism of the as-prepared samples was also proposed. The experimental results indicate that the degradation efficiency of the as-prepared SnO 2 QDs/ZnSNs heterojunction first increases and then decreases with increasing the usage of ZnSNs. When the mass ratio of SnO 2 QDs to ZnSNs is 1: 2 in 180 min, the asprepared samples have the highest degradation efficiency of 89.1% for rhodamine B, 97.7% for potassium dichromate, and 83.8% for tetracycline, which are much higher than 51.7%, 26.8%, and 0.9% of pure SnO 2 QDs as well as 37.9%, 87.1%, and 19.1% of pure ZnSNs, respectively. After it is repeatedly degraded for 3 times, it possesses the degradation efficiency of 62.5% for rhodamine B, which increases by 200.5% in comparison with 20.8% of the pure SnO 2 QDs. Moreover, the enhanced photocatalytic performances of the as-prepared hybrids are attributed to the formation of heterojunction between the SnO 2 QDs and ZnSNs. In addition, hydroxyl radicals and superoxide anion radicals play major roles during the photocatalytic degradation process, while holes play a minor role.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-9
·
IF 5.479
Zhen Deshuai,Jiang Ning,Geng Hongchao,Qiao Yan,Liu Yu,Zhu Xingqi,Gao Chan,Grimes Craig A.,Cai Qingyun
Cobalt-doped nanoporous carbon (Co-NPC) with dodecahedral shape was pyrolytically synthesized and applied as a sorbent and matrix for the enrichment and analysis of small molecules by surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS). Extremely low detection limits were accomplished for cetyltrimethylammonium bromide (1 fg·mL −1 ), and Rhodamine B (1 fg·mL −1 ) in water, and Malachite Green and its metabolite in fish blood and fish extracts (pg·mL −1 concentrations).
Schematic representation of cobalt-doped nanoporous carbons (Co-NPCs) applied as SALDI matrix for analysis of toxic contaminants in fish and receipt papers. The Co-NPCs have a high desorption/ionization efficiency and low limit of detection.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 10
·
IF 1.768
Xuying Nan,Yi Huang,Qinguo Fan,Jianzhong Shao,Yuhua Yao
Three dye-linked photoinitiators with excellent spectral stability in an acid medium were synthesized by the covalent bonding of a coinitiator (tertiary amine) and a benzoyl group or two coinitiators to the phenolic and carboxyl group position of erythrosine B. The combination of the iodonium salt and free tertiary amino used to initiate the free-radical/cationic visible photopolymerization was investigated to acquire the relationship between the structure and performance. The photoinitiating ability of the derivative with the phenolic position bearing a coinitiator was poorer than of the derivative with the carboxyl group bearing one because of the strong back electron transfer of the former. For the derivative with a linked coinitiator on the carboxyl position, the proximity effect between the sensitizer and the coinitiator moiety resulted in an excellent photoinitiating ability for radical/cationic polymerization; this suggested its potential for application. Although radical/cationic photopolymerization could be initiated by the derivative/coinitiator/iodonium salt, the different component ratios between them had different effects on these two polymerizations; this provided useful information for the design of effective photoinitiators for different polymerizations. On the basis of the fluorescence quenching and photopolymerization results, a corresponding synergistic mechanism was proposed. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43035.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2014
·
IF 2.694
Zhiyong Zhao,Qinxiong Rao,Suquan Song,Na Liu,Zheng Han,Jiafa Hou,Aibo Wu
A simple and reliable method for simultaneous determination of deoxynivalenol-3-glucoside and major type B trichothecenes (deoxynivalenol, nivalenol, fusarenon X, 3-acetyldeoxynivalenol, 15-acetyldeoxynivalenol and deepoxy-deoxynivalenol) in animal feed and raw materials has been developed and validated in this study. The method was based on an improved dispersive solid-phase extraction (DSPE) followed by analysis using high performance liquid chromatography coupled to tandem mass spectrometry (HPLC-MS/MS). Also, matrix-matched calibration curve ( R 2 > 0.99) was employed to minimize matrix effects and ensure accurate quantification. The recoveries during sample preparation process (including extraction and clean-up) ranged from 79.03% to 118.39%, with intra-day and inter-day relative standard deviation lower than 20% for all the analytes. The limit of quantification ranged from 5.0 μg/kg for deoxynivalenol to 13.6 μg/kg for fusarenon X. The validated method was successfully applied to the analysis of animal feed and corn. The pilot study showed that 37 out of 41 samples were contaminated with deoxynivalenol-3-glucoside at the levels of 6.0–121.0 μg/kg. Most of the type B trichothecenes were also found with the exception of fusarenon X, at the contaminated levels of 10.0–1382 μg/kg. To the best of our knowledge, this was the first scientific report on the co-occurrence of masked deoxynivalenol and type B trichothecenes in animal feed and raw materials.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Muhammad Khalid Hussain,N.R. Khalid,Muhammad Tanveer,Amir Abbas,Furqan Ali,Warda Hassan,Martha Rianna,Sultana Rahman,Muhammad Hamza,Muhammad Aslam
x ZnO- (1-x) MoO 3 (x = 0.0,0.1,0.3,0.5,0.7) nanocomposite materials have been efficiently fabricated by the facile hydrothermal method to enhance the photocatalytic activities for the environmental applications. The fabricated samples were characterized via XRD , SEM, EDX , XPS, UV–Visible spectroscopy, PL and FTIR analysis. The 5% ZnO-M nanocomposite material exhibits reduced band gab energy and superior photocatalytic activity for rhodamine B (RhB) and alizarin yellow (AY) dyes degradation of 94% and 81% within 120 min under visible light irradiance. Our reported study reveals that the 5% ZnO-M photocatalyst is extremely stable and reusable for more than five reaction of cycles. The photocatalytic enactment of the 5% ZnO-M composite was mostly endorsed due to Z-scheme photocatalysts, higher visible light adsorption on the surface morphology , improved charge separation/transfer, and decreased recombination rate. This study may provide new ideas for developing effective, innovative Z-scheme heterojunction photocatalysts and encouraging their extensive application for the degradation of dyes from wastewater.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiangyu Zhang,Tongyun Yin,Zhengquan Chen,Yunchuan Long,Juan Jiang,Shaoqi Zhou,Jing Hu,Shengming Ma
The activation mechanism and degradation mechanism of peroxydisulfate (PDS)-based advanced oxidation technologies in applications have received increasing attention. In this paper, N,B co-doped biochar graphene (N,B-rGO-900) was synthesised from discarded coconut shells, which showed good adsorption and catalytic properties in the removal of oxytetracycline (OTC), there is no energy barrier to impede the electron transfer process. The adsorptive removal rate was 53 % in 30 min, and the degradation rate was 94.14 % in 15 min, with a reaction rate constant of 0.1363 min −1 (k 0- 15min ), which was higher than the degradation rate(47 %) in 15 min for N-rGO with an energy barrier of 0.215 eV. More importantly, this study clarifies the structure–activity relationship of the catalyst, in the radical pathway, the number of electrons transferred to the PDS from the lone pairs of pyrrolic N and pyridinic N on N,B-rGO-900 was 0.045 e, which was higher than that of N-rGO (0.032 e) and pristine GO (0.019 e), contributing to the decomposition of PDS to produce radicals; in contrast, the N,B-rGO-900 in the nonradical pathway acts as an electron channel to promote electron migration from OTC to surface-confined N,B-rGO/PDS* complexes, the electron migration is driven by the potential energy difference between the highest occupied molecular orbital (HOMO, −4.932 eV) and the lowest vacant molecular orbital (LUMO, −1.923 eV), a process in which PDS extracts 2 electrons to the OTC, while ketones or quinones in the catalyst can act as Lewis acid sites to activate PDS to produce 1 O 2 , in addition the introduction of N and B atoms reduces its activation energy in the reaction process (Ea = 45.45 kJ mol −1 ). The highest contributing active substance in the degradation process was O 2 • − (97 %) in the free radical pathway, and it was capable of degrading OTC into small molecules that are non-toxic to fish, daphnid, and algae, toxic concentrations much greater than 100 mg/L, and the catalyst was able to maintain an excellent performance after four reuse experiments and anti-interference experiments. This study systematically elucidates the process mechanism of antibiotic degradation by persulfate and provides new insights into the design of economic, efficient and stable targeted carbonaceous catalysts.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·Vol. 416
·期 29
·7043-7062
·
IF 3.8
Liu Wen-Ya,Xu Di,Meng Hui-Hui,Wang Cheng-Yao,Feng Xin,Wang Jun-Song
Cucurbitacin B (CuB) is a natural triterpenoid with diverse pharmacological effects including potent anticancer activity. However, its oral bioavailability is hampered by limited metabolism in vivo. We characterized CuB’s in vivo metabolism in rats to uncover bioactive metabolites retaining therapeutic potential, using a robust UHPLC-Q-TOF–MS/MS workflow. This workflow combined molecular networking, fragmentation filtering, and mass defect filtering to identify CuB metabolites in rat urine, plasma, and feces following oral administration. Thirteen metabolites were identified and seven were confirmed. Major phase I transformations involved hydrolysis, reduction, epoxidation, and amination. Phase II conjugation included cysteine, glutathione, glucuronide, and gluconic acid conjugates. Notably, one of the main metabolites formed was the cysteine conjugate CuB-Cys. CuB-Cys maintained similar in vitro antiproliferative activity to CuB on HepG2, MCF-7, and PANC-1 cancer cell lines. However, it demonstrated lower cytotoxicity towards non-cancerous L02 cells, highlighting improved therapeutic selectivity. Mechanistically, CuB-Cys induced greater apoptotic signaling in HepG2 cells than CuB via enhanced caspase activation and disrupted BAX-Bcl-2 balance. This represents the first systematic characterization of CuB’s in vivo metabolic pathway. The identification and confirmation of CuB-Cys provide insight for drug development efforts aiming to maintain therapeutic efficacy while reducing toxicity, via metabolite-based approaches. Our findings shed light on strategies for improving CuB’s clinical potential. Graphical Abstract
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Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Yizhuo Gu,Benben Liu,Zhongjia Yang,Shaokai Wang,Min Li
Fiber-reinforced polymer composites (FRP) have multifunctional properties of structural support and radiation shielding, which can meet the lightweight requirements of space exploration. However, the filtering effect of fiber bundles on the functional fillers reduces the shielding properties of the composites. This study enhances neutron shielding properties by developing a B-containing polymer matrix through blending B-phenolic/epoxy with trimethoxyboroxine, followed by the deposition of B₄C/GO multilayers on carbon fibers using a layer-by-layer (LBL) self-assembly method. The microstructures of B₄C/GO layers happening the carbon fibers were characterized using scanning electron microscopy and nanoscale infrared spectroscopy. The assembled fibers and B-containing matrix were then fabricated into laminate composites via hot pressing. The resulting composite, featuring four layers of assembly on the fiber surface, achieves a thermal neutron linear attenuation coefficient (μ) of 2.989 cm⁻ 1 and a tensile strength of 830 MPa, showing strong structural integrity and effective radiation shielding. Furthermore, Monte Carlo simulations were conducted to research the shielding effectiveness of various filler distribution models, including homogeneous, heterogeneous (fillers accumulating between fiber bundles) and the proposed surface-assembly model. The results indicate that the μ of the surface-assembly model is 9.1% higher than that of heterogeneous model due to reduced neutron penetration zones. Therefore, LBL self-assembly is a promising approach to avoid the degradation of shielding performance caused by the “filtering effect” in FRPs.
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Frontiers in Pharmacology
·
2018
·
IF 3.831
Tsai Hsiang-I,Jiang Lijuan,Zeng Xiaowei,Chen Hongbo,Li Zihuang,Cheng Wei,Zhang Jinxie,Pan Jie,Wan Dong,Gao Li,Xie Zhenhua,Huang Laiqiang,Mei Lin,Liu Gan
The clinical applications of platinum-based antitumor agents are still largely limited by severe side effects as well as multidrug resistance (MDR). To solve these problems, we developed an 1,2-diaminocyclohexane-platinum(II) (DACHPt)-loaded nanoparticle (NP-TPGS-Pt) by self-assembly of poly(amidoamine)-polyglutamic acid-b-D-α-tocopheryl polyethylene glycol 1000 succinate (PAM-PGlu-b-TPGS) and DACHPt. NP-TPGS-Pt showed robust stability and pH-responsive DACHPt release profile in vitro similar to the PEG-containing nanoparticle (NP-PEG-Pt). Meanwhile, in contrast with NP-PEG-Pt, NP-TPGS-Pt exhibited efficient nanoparticle-based cellular uptake by the Pt-resistant A549/DDP human lung cancer cells and caused much more cytotoxicity than free Oxaliplatin and NP-PEG-Pt. Finally, this NP-TPGS-Pt was proved to perform outstanding inhibition of Pt-resistant tumor growth, much superior than free Oxaliplatin and NP-PEG-Pt. Thus, this NP-TPGS-Pt provides a novel powerful nanomedicine platform for combatting multidrug resistant cancer.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Shi-Wei Fu,Jian Yang,Zong-Yan Zhao,Bao-Feng Shan,Jia-Xin Zhang,Jin Zhang,Qingju Liu,Jianyong Feng,Zhaosheng Li,Zhigang Zou
A profound understanding of the band-edge electronic structure is crucial for advancing the development of highly efficient photocatalytic materials and unraveling the underlying mechanisms. This study employs a unified and consistent assessment protocol, offering a systematic exploration of the inherent connections between the band-edge electronic structure and the photo(electro)catalytic performance of a series of delafossite ABO2 compounds (A = Cu, Ag; B = Al, Ga, In). These compounds exhibit characteristics of indirect bandgap semiconductors, with fundamental and optical bandgaps spanning from 1.45 to 3.57 eV. Notably, the Cu-based ABO2 compounds display a significantly larger fundamental bandgap and excel as photocathode materials when the B-site element is held constant. Among these, CuInO2 emerges as the most promising candidate, showcasing superior photo(electro)catalytic performance. Extensive density functional theory calculations unravel intricate insights into the interplay between the band-edge electronic structure and valence orbital hybridization of the A- and B-site elements, providing invaluable perspectives for comprehending and enhancing the photo(electro)catalytic performance of such compounds. The findings in this study not only establish robust theoretical foundations for integrating ABO2 compounds into the field of photo(electro)catalysis but also lay the groundwork for future material design and optimization.
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