JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Yuehong Xie,Chao Feng,Yuan Guo,Afaq Hassan,Shiang Li,Yi Zhang,Jide Wang
This paper introduces a facile method to disperse rich-defect CuCo-N x active sites onto hollow graphite carbon nanocages , through one-pool dicyandiamide-assisted pyrolysis of porous CuCo-PBA-2MI precursor. The as-prepared CuCo-N x @N-CCs composites exhibit favorable electrocatalytic activity and robust durability for oxygen reversible catalysis (ORR/OER) and hydrogen evolution reaction (HER) in the same low concentration alkaline electrolyte (0.1 M KOH), including E ORR, 1/2 = 0.80 V, E OER, 10 = 1.58 V and E HER, 10 = −0.319 V. The nanocomposites show the superior electrocatalytic practical application in Zn-air batteries self-driven overall water splitting. Insights into the experimental analyses reveal that during the pyrolysis process, CuCo-PBA-2MI precursor captures volatile CN x active species from dicyandiamide, eventually forming high dispersed CuCo-N x active sites with unique N-doped porous hollow carbon scaffolds structure. Such hollow nanocage structures can effectively protect the active site from agglomeration and uneven distribution. It also prevents nanomaterials corrosion from alkaline electrolyte in the electrocatalytic reaction process. We believe that this strategy will offer useful guidelines to researchers who are interested in developing advanced and performance-oriented multifunctional electrocatalysts for clean energy devices.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
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2023
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IF 8.8
Xiangchu Zeng,Guanghua Zhang,Jia Wen,Xiuling Li,Junfeng Zhu,Zhe Wu
Heavy metals and azo dyes caused huge harm to the aqueous system and human health. A magnetic chitosan/polyethyleneimine embedded hydrophobic sodium alginate composite ( MCPS ) was designed and prepared to simultaneously remove aqueous same ionic type heavy metals and azo dyes. In mono-polluted system, the optimal pH for Cr(VI), MO (methyl orange), Cu(Ⅱ) and MB (methylene blue) were 3, 2, 6 and 12 with a saturated adsorption capacity of 87.53, 66.41, 351.03 and 286.54 mg/g, respectively. Pseudo-second-order was suitable to describe the adsorption kinetics of them and the adsorption isotherms were more consistent with the Langmuir isotherm model being a spontaneous, endothermic, and entropy-increasing process. In binary-polluted system, MCPS possessed simultaneous adsorption for Cr (Ⅵ)-MO and Cu(Ⅱ)-MB pollutants at their optimal pH, in addition, whether in anionic or cationic solution, the removal of heavy metals were promoted with the add of azo dyes but the removal of azo dyes were suppressed with the add of heavy metals. Both Cr (Ⅵ)-MO and Cu(Ⅱ)-MB pollutants could be effectively adsorbed and desorbed from MCPS by changing the pH of the aqueous solution to realize recyclability . Lastly, removal mechanism was revealed in detail by FT-IR, EDS and XPS .
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2014
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IF 4.331
Saou-Hsing Liou,Gordon C.C. Yang,Chih-Lung Wang,Yu-Han Chiu
This 5-month study contains two parts: (1) to monitor the concentrations of 11 phthalate esters metabolites (PAEMs) and two beta-agonists in human urine samples collected from a small group of consented participants including 16 females and five males; and (2) to analyze the residues of phthalate esters (PAEs) and beta-agonists in various categories of drinking water consumed by the same group of subjects. Each category of human urine and drinking water had 183 samples of its own. The analytical results showed that nine PAEMs were detected in human urine and eight PAEs were detected in drinking water samples. It was found that average concentrations of PAEMs increased as the age increased, but no significant difference between sexes. Further, using the principal component analysis, the loadings of age effect were found to be two times greater than that of gender effect in terms of four DEHP metabolites. Regarding beta-agonists of concern (i.e., ractopamine and salbutamol), they were neither detected in human urine nor drinking water samples in this study.
研究领域:
环境科学
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毒理学
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公共卫生
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Tiantian Chen,Rui Wang,Aihong Zhang,Ting Xu,Rong Xiao,Wenhai Chu,Daqiang Yin
Peroxymonosulfate (PMS) is receiving increasing interest as an oxidant used during the disinfection of drinking water. However, it does not have continuous disinfection ability as sodium hypochlorite (NaClO) does. PMS/Cl − can produce reactive chlorine species and thus provide a persistent disinfectant residual in distribution systems. This study investigated PMS/Cl − disinfection versus NaClO disinfection in terms of the formation and estimated cytotoxicity of CX 3 R-type disinfection by-products (DBPs) under the same dose of free chorine. Results showed that free chlorine produced by PMS/Cl − reaction can react with organic compounds and the productions of CX 3 R-type DBPs were dependent on the free chlorine dose, pH and reaction time. Specifically, chloroform (CF) and chloral hydrate (CH) generally increased with increasing of free chlorine dose and reaction time. CF increased steadily with increasing pH, while CH firstly increased and then decreased with increasing pH. Haloacetonitriles and haloacetamides firstly increased and then decreased with increasing of free chlorine dose and reaction time, and decreased continuously with increasing pH. The formation pathway of CX 3 R-type DBPs during chlorination (PMS/Cl − ) of tyrosine was proposed, based on the detected intermediates (i.e., Benzyl cyanide, 4-hydroxy-benzyl-cyanide, 4-chlorophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol). The estimated cytotoxicity of CX 3 R-type DBPs in chlorinated water firstly increased and then decreased with the increasing of reaction time, free chlorine dose and pH, which highly related to the changes of DCAN (the most toxic CX 3 R-type DBP) levels. Comparing to NaClO disinfection, PMS/Cl − disinfection can better control the formation and cytotoxicity of CX 3 R-type DBPs, which was attributed to the degradation of natural organic matter, CX 3 R-type DBPs intermediates and CX 3 R-type DBPs by the residual PMS . This study demonstrated the superiority of PMS/Cl − as an alternative disinfectant comparing to NaClO.
研究领域:
环境科学
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公共卫生
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Chao Feng,Yuehong Xie,Shanshan Qiao,Yuan Guo,Shiang Li,Li Zhang,Wei Wang,Jide Wang
We used a simple MOFs-assisted synthesis strategy based on the encapsulation and in-situ carburizing reaction of Cu-based metallic organic frameworks (NENU-5) to synthesize porous nano-octahedral materials, MoWN/MoWC@N C Ts (T = 700, 800, and 900). Together with the vapor deposition strategy, the volatile nitrogen species from the pyrolysis of dicyandiamide were captured by the nano-octahedral materials, and formed tungsten-molybdenum-based carbonitride nanocrystals encapsulated in nitrogen-doped carbon. The porous nano-octahedron has a unique heterostructure composed of Mo 2 N/MoC/W 2 N/WC. The representative MoWN/MoWC@N C 800 showed trifunctional electrocatalytic activity in oxygen reduction reaction/oxygen evolution reaction/hydrogen evolution reaction (ORR/OER/HER) in an alkaline medium (0.1 M KOH). The total oxygen electrode activity index ΔE = 0.795 V (vs. RHE) was found in OER/ORR, and the material also exhibits excellent HER performance. The minimum potential of −0.17 V (vs. RHE) was provided at a current density of −10 mA cm −2 . MoWN/MoWC@N C 800 showed excellent cycle stability and durability in ORR/OER/HER with the same electrolyte (0.1 M KOH). More importantly, MoWN/MoWC@N C 800 could be used to construct high-performance zinc-air batteries and sued for driving electrocatalytic water splitting in a self-powered manner. The successful preparation of the materials indicate that the synthetic strategy provides new reference ideas for developing functional materials with high catalytic properties for various applications.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Na Li,Junren Xu,Yiqiao Zhao,Mengmeng Zhao,Zhonghua Liu,Kunbo Wang,Jianan Huang,Mingzhi Zhu
Tea polyphenols transform under processing methods, but a systematic study on their changes in the same large-leaf tea cultivar is lacking. Here, Camellia sinensis var. assamica cv. Yunkang-10 leaves underwent six processing methods and were assessed using optimized nontargeted (UHPLC-Q-Exactive Orbitrap-MS) and targeted (UHPLC-QqQ-MS) polyphenomics, along with molecular networking analysis. 903 and 52 polyphenolic compounds (catechins, flavones and flavonols, and phenolic acids) were respectively relatively and absolutely quantified for the first time. Dark and black teas, with the lowest polyphenol content, differed from the other four tea types, although variations existed among these four teas. However, some flavonol and flavone aglycones (e.g. kaempferol, apigenin), as well as some phenolic acids (e.g. ellagic acid, gallic acid), exhibited higher levels in dark and black teas. Correlations between polyphenolic composition and electronic sensory characteristics were observed using E-tongue and E-eye. This study enriches understanding of polyphenol profiles in Chinese teas post diverse processing.
研究领域:
食品科学
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植物化学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
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2026
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IF 6.2
Maxim V. Mikhailenko,Tatiana Yu. Astakhova,Elena N. Timokhina,Maxim A. Faraonov,Alexey V. Kuzmin,Salavat S. Khasanov,Denis V. Korchagin,Gennady V. Shilov,Akihiro Otsuka,Hiroshi Kitagawa,Dmitri V. Konarev
A series of anionic bi- and trinuclear complexes of CoII, FeII and MnII with hexaazatrinaphthylene (HATNA) and hexaazatriphenylenehexacarbonitrile (HAT(CN)6), incorporating paramagnetic Cp*2Fe+ cations (S = 1/2), were obtained. It was demonstrated that even a mild Cp*2Fe reductant can be used to reduce metal complexes of HAT-type ligands. Metal iodides were transferred from the pristine powder to the complexes in a non-coordinating solvent via complex formation with spiropyran or tetrabutylammonium iodide. The isostructural complexes (Cp*2Fe+)[(MIII2)2·HATNA]−·C6H4Cl2·0.5C6H14 (M = Co (1), Fe (2) and Mn (3)) contain monoanionic [(MIII2)2·HATNA]− units, which alternate in π-stacks with Cp*2Fe+ cations and also form π-stacked [(MIII2)2·HATNA−]2 dimers. Metal ion coordination is asymmetric, featuring one short and one long M–N bond. The short M–N bonds are 1.973(6) Å for CoII (1), 2.039(4) Å for FeII (2), and 2.115(4) Å for MnII (3); these are the shortest bonds reported to date among studied HAT-based complexes for CoII and FeII. These complexes exhibit very strong antiferromagnetic metal–radical coupling, which isolates their high-spin ground states at high temperatures. To the best of our knowledge, the exchange coupling value of −300 cm−1 observed for 3 is the highest among MnII-containing complexes based on a radical ligand with delocalized spin. Compound (Cp*2Fe+)[(FeIII2)3·HATNA]−·C6H4Cl2 (4) is unique due to its magnetic behavior, which is severely different from that previously observed for similar trinuclear radical FeII-containing HAT-based complexes. Instead of a smooth increase in the χMT value with a temperature decrease, attributed to the formation of a high-spin system, a rapid increase below 30 K is observed. Trinuclear trianionic species [(FeIII2)3·HAT(CN)6]3− are isolated in (Cp*2Fe+)3[(FeIII2)3·HAT(CN)6]3−·4C6H4Cl2 (5) and do not participate in intermolecular exchange coupling. The unusual magnetic behavior of 5 can only be described by a model implying different signs of D for metal ions in the complex. Such a feature arises from the substantial difference in the coordination geometry of one Fe1 ion compared to the other two Fe2 ions.
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DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2019
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IF 2.606
Shaohui Xu,Zhu Jin,Zhipeng Zhang,Wei Huang,Yuanyuan Shen,Zhongmin Wang,Shengrong Guo
It is necessary for effective combinational effects that multiple chemotherapeutic agents enter and act on the same tumor cells simultaneously at a suitable ratio. Due to their individual physicochemical or biopharmaceutical properties, they cannot reach the same cells at its predetermined ratio after co-administration. Herein, we report a novel system with precise ratiometric co-loading, co-delivery and intracellular co-release of paclitaxel (PTX) and curcumin (CUR), to investigate their synergistic effects. We prepared the system by conjugating PTX and CUR at different ratios onto the same gold nanorods (GNRs). We demonstrated that PTX and CUR could be precisely ratiometric co-loaded to form dual-drug conjugated biotin-PEG modified GNRs (abbreviated as PTX/ [email protected] ), which could co-deliver dual drugs into tumor cells with a predetermined ratio and co-release them intracellularly. The PTX/ [email protected] with the mass ratio of PTX and CUR at 1:1 exhibited the best synergistic effect on multidrug resistant MCF-7/ADR cells while the free PTX and CUR mixture with the mass ratio of at 1:0.75 displayed the strongest synergism. Cytotoxicity studies showed that PTX/ [email protected] are superior to free drug mixture. Furthermore, PTX/ [email protected] could remarkably induce apoptosis of MCF-7/ADR cells under near-infrared irradiation. Moreover, we found that PTX/ [email protected] significantly inhibited P-glycoprotein (P-gp) expression in MCF-7/ADR cells.
研究领域:
药学
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纳米技术
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癌症研究
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药物递送系统
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）