Chemical Engineering Journal Advances
·
2021
·
IF 0
Yi Xie,Linli Dai,Tonghui Xie,Yongkui Zhang,Yabo Wang,Huan Yang
Conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) through advanced reduction process is important to lower the hazardous risk of 4-NP, which requires the development of highly efficient catalyst. Herein, we proposed a novel strategy to fabricate nickel phosphide/carbon composite for 4-NP reduction in the presence of NaBH 4 . An unusual precursor of adenosine 5′-triphosphate (ATP) was applied to provide the essential phosphorus and carbon elements for nickel phosphide and biocarbon, respectively. ATP-Ni complex was firstly prepared and then transformed to nickel phosphide/biocarbon composite by an anoxic pyrolysis treatment. Material characterizations confirmed both large particles of hundreds of nanometers and small particles of ∼2.4 nm existing for Ni 2 P, which were dispersed on N/P-doped biocarbon with thin layer sheet-like structure. When applied for 4-NP reduction, Ni 2 P/BC exhibited fast reaction kinetic with a pseudo-first-order reaction rate constant of 0.019 s −1 (normalized rate constant 253 s −1 g −1 ) and good reusability in 10 consecutive reaction runs (95.8% conversion efficiency). It is suggested that such superior activity may originate from the high affinity of Ni 2 P/BC towards reactants and the good electron transfer ability of Ni 2 P/BC. This study not only enriches the synthesis strategy of transition metal phosphide, but also provides a superior catalyst for advanced reduction process.
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DOI
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 11
·4640-4647
·
IF 3.069
Wei-Song Gao,Jin-Miao Wang,Ning-Ning Shi,Chang-Neng Chen,Yu-Hua Fan,Mei Wang
To mimic the strategy used by natural photosynthesis in Photosystem II, which adopts the cubic Mn4CaO5 cluster as a natural oxygen-evolving complex, a bio-inspired cubane-like tetranuclear cluster [Cu4(pdmH)4(OAc)2](NO3)2·3H2O (1) has been synthesized successfully with pyridine-2, 6-dimethanol as the ideal ligand, and investigated by X-ray crystallography, PXRD, in situ UV-vis-NIR spectroelectrochemical analysis, and magneto- and electrochemistry. By X-ray analysis, it is shown that the distorted cubane-like core Cu4(μ3-O)4 is composed of four CuII and four μ3-O which arrange at the vertices of a slightly distorted cube. Electrochemical studies indicate that complex 1 presents potential properties as an effective molecular catalyst for electrocatalytic water oxidation under aqueous alkaline conditions at a potential of ∼1.20 V vs. NHE with a relatively low overpotential of ∼400–665 mV vs. NHE, which may result from the unique covalent metal–oxo bonding. Magnetic susceptibility measurements reveal that complex 1 displays overall antiferromagnetic exchanges between the Cu(II) ions within the clusters. Temperature dependence of in-phase (χM′) ac susceptibility signals display frequency-dependence, whereas the out-of-phase (χM′′) signals show no significant frequency-dependence for complex 1, which indicates that the complex may not be a SMM.
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高影响因子
CATALYSIS TODAY
·
2023
·
IF 5.3
Yue Hua,Jingsen Zhang,Tengda Zhang,Aimin Zhu,Guangqing Xia,Xiuling Zhang,Lanbo Di
Catalytic removal of 4-nitrophenol (4-NP) in wastewater remains a significant challenge due to the poor activity and stability of the catalysts. Herein, low-cost graphite oxide (GO) supported Pd and Ni NPs (PdNi/GO) with enhanced catalytic activity and stability for 4-NP reduction were synthesized by a plasma method in the aqueous solution of Pd(NO 3 ) 2 , Ni(NO 3 ) 2 , and GO. The normalized rate constant k nor over the PdNi/GO with Pd/Ni= 1.8:0.2 for 4-NP reduction was as high as 5480 min −1 ·g −1 ·L, which was comparable with that of Pd/GO, and it was about 50.7 times higher than that of Pd/rGO-H prepared by traditional thermal reduction method. Importantly, after six reaction cycles, it only decreased to 74.8% of the initial value, which was much higher than that of the Pd/GO catalyst (59.8%). The characterization results indicated that plasma synthesized Pd/GO catalyst can keep the oxygen-containing groups (OCGs) on the GO surface , generate abundant defects, and facilitate the adsorption of the 4-NP. Interestingly, the addition of Ni could keep these merits, and the formed PdNi alloyed structure may facilitate the electron transfer between PdNi NPs and GO, contribute to the strong adsorption of 4-NP and the rapid generation of active hydrogen. Consequently, the PdNi/GO catalyst exhibited outstanding catalytic activity and stability for 4-NP reduction. This work provided a fast, facile, environmentally friendly, and easy to scale up plasma method for synthesizing high performance Pd-based catalysts.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Fanying Kong,Aijie Wang,Hong-Yu Ren,Liping Huang,Meiying Xu,Huchun Tao
A new approach that improved the dechlorination and mineralization of 4-chlorophenol (4-CP) was demonstrated in a sequential biocathode–bioanode bioelectrochemical system (BES) with mixed photosynthetic bacteria (PSB). The biocathode with additional PSB inoculation showed higher 4-CP dechlorination efficiency (DE) and maximum current (81.8 ± 2.9%, 0.021 ± 0.002 A) than that at abiotic cathode (45.3 ± 3.7%, 0.011 ± 0.002 A) ( P < 0.005). Light response in biocathode BES with or without PSB ascertained the important role of PSB played in the dechlorination and current generation. Dechlorination and mineralization of 4-CP was achieved in the sequential biocathode–bioanode BES, which could be further enhanced with PSB inoculation in both cathode chamber and anode chamber. 4-CP DE in the cathode chamber was improved from 55.0 ± 2.0% to 78.8 ± 4.9%, and the phenol degradation in the anode chamber was improved from 65.3 ± 2.1% to 71.3 ± 1.4%. This study directed a new way for improving dechlorination at biocathode and product degradation at bioanode with PSB inoculation in BES.
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高影响因子
Nanocomposites
·
2023
·
IF 4.6
Lin Wu,Tao Pang,Laxia Wu,Yebin Guan,Liwei Yin
This work presents a facile strategy for the generation of Fe3O4@poly(4-vinylpyridine)-block-polystyrene (Fe3O4@P4VP-b-PS) magnetic polymer nanocomposites. P4VP-b-PS nanoparticles prepared by dispersion RAFT polymerization of styrene in methanol/water in the presence of macro-P4VP chain transfer agent was employed as templates to grow Fe3O4 on polymeric network templates. With the following addition of FeCl3 into the above polymer colloids, pyridyl moieties in P4VP block of nanoparticles could further react with Fe3+ through a coordination reaction to generate Fe3+@P4VP-b-PS nanoparticles. After the subsequent addition of FeCl2 and NH3⋅H2O, the co-precipitation reaction occurred on the surface of the polymeric nanoparticle to form Fe3O4@P4VP-b-PS magnetic polymer nanocomposites. Herein, FT-IR, XRD, TGA, XPS, TEM and VSM were applied to characterize the morphology, structure and magnetism performance of the synthesized magnetic polymeric nanocomposites.
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高影响因子
Biomaterials Science
·
2020
·Vol. 8
·期 17
·4757-4766
·
IF 6.183
Jing Zhang,Dan Liu,Jiale Liu,Yanfeng Han,Haiyan Xu,Xigang Leng,Deling Kong,Lanxia Liu
Combined blockades of CTLA-4 and PD-1 can yield better overall complementary clinical outcomes than individual blockades, but the response rates are still relatively low. To investigate the anti-tumor effects of various combined strategies, we designed various spherical nucleotide nanoparticles (SNPs) loaded with CTLA-4 aptamer (cSNPs), PD-1 siRNA (pSNPs) or both (hybrid SNPs, or hSNPs). The results demonstrated that hSNPs could promote significantly stronger anti-tumor immune responses in a nonredundant fashion than the mixture of pSNPs and cSNPs (pSNPs & cSNPs). We reasoned that this is because all individual immune cells could receive both CTLA-4 and PD-1 blockades when they engulfed hSNPs, but it is much less likely that individual immune cells could receive both CTLA-4 and PD-1 blockades as many of them may not take both pSNPs and cSNPS from pSNPs & cSNPs. Further results revealed that the synergistic immune stimulatory effects of CTLA-4 and PD-1 blockades in the form of hSNPs were at least partly through regulating the immune suppressive function of both Tregs and TIM3+ exhausted-like CD8 T cells and allowing effector T cells to expand. This mechanism is not identical to earlier reported mechanisms of CTLA-4 and PD-1 blockades.
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产品关联
DOI
PubMed
高影响因子
Separations
·
2024
·Vol. 11
·期 11
·305
·
IF 2.5
Jingmin Duan,Yafei Zhao,Zhuhe Zhai,Shengqiang Chen,Bing Zhang
Efficient and low-cost nanocatalysts are extremely desirable for the catalytic reduction of 4-nitrophenol (4-NP). A smaller nanocatalyst particle size and stronger support effect can significantly enhance the catalytic performance. Naturally occurring halloysite nanotubes (HNTs) are promising alternative supports for fine metal nanoparticles, but the smooth surface and single type of functional groups on HNTs are usually unfavorable for the anchoring of metal ions. Herein, we modified HNTs using a mild and controllable molten salt etching method to create a rough surface (rHNTs), followed by loading Pt–Ni alloys to prepare Pt–Ni/rHNTs for the catalytic reduction of 4-NP. The results demonstrate that ultrafine Pt–Ni alloy nanoparticles with a diameter of 1.60 nm are uniformly dispersed on the rough surface of rHNTs. The particle size and catalytic performance can be tuned by adjusting the loading amount of Pt–Ni. The optimized Pt–Ni/rHNT (1 wt %) nanocatalyst reveals the smallest Pt–Ni particle size and the highest catalytic rate of 0.1953 min−1, which exceeds many Pt–Ni-based catalysts in previous reports. This work offers an ingenious idea for the mild surface modification of HNTs and a brilliant perspective for the rational design of inexpensive 4-NP reduction nanocatalysts.
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 15
·e202406023
·
IF 2
Leyao Chen,Nuoya Wang,Xiaoyu Chang,Ruiyong Wang
Graphical This work investigated the inhibition of 4-thiazolidinone derivatives on SARS-CoV-2 Mpro using enzyme assays, spectroscopy, and molecular docking. Compound 3a showed the best inhibition (IC 50 = 2.36 ± 0.36 µM, K i = 1.72 µM), and the trifluoromethyl group in 3a played an important role. Hydrogen bonding and van der Waals forces were the main forces for the binding. This work provided clues for Mpro inhibitor development. Since the outbreak of COVID-19, one of the strategies used to search for potential drugs has been to screen inhibitors of SARS-CoV-2 Mpro. This work investigated the inhibitory effects of 4-thiazolidinone derivatives on main protease (Mpro) using various methods, including enzyme activity assays, enzyme kinetics, spectroscopy experiments, molecular docking simulations, microscale thermophoresis, and cytotoxicity tests. Compound 3a demonstrated the best inhibition effect among the compounds tested, with IC 50 = 2.36 ± 0.36 µM and K i = 1.72 µM. The trifluoromethyl group in 3a might enhance its inhibition ability. Interactions between the 4-thiazolidinone derivatives and Mpro resulted in fluorescence quenching primarily through static quenching. Thermodynamic analysis indicated that the interaction forces are mainly hydrogen bonds and van der Waals forces. Spectral results revealed that the 4-thiazolidinone derivatives affected the microenvironment of aromatic amino acid residues in Mpro and altered its secondary structure. Differential scanning fluorimetry was used to confirm the interaction between the 4-thiazolidinone derivatives and Mpro. Results of microscale thermophoresis indicated that the K d between 3a and Mpro was 1.56 ± 0.24 µM. Molecular docking simulations provided a more intuitive visualization of the interaction forces. This study provides clues for screening novel Mpro inhibitors.
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高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
An Nang Vu,Ngoc – Hoa T. Le,Thanh- My T. Nguyen,Uyen N. Nguyen-Thai,Kim – Phung L. Nguyen,Lan Duc Vu
We present a straightforward method for creating reusable magnetic Fe 3 O 4 /Ag catalysts. Three distinct Fe 3 O 4 varieties were synthesized using different methods, and Ag nanoparticles were deposited onto the Fe 3 O 4 matrix via a hydrothermal process. The resulting Fe 3 O 4 and Fe 3 O 4 /Ag materials were characterized by XRD, XPS, FT-IR, Raman, DLS, FE-SEM, TEM, EDX, VSM, and UV-Vis spectroscopy. XRD analysis of the Fe 3 O 4 particles synthesized using the solvothermal reduction process (S2) revealed firm diffraction peaks, indicating high crystallinity. After hydrothermal treatment, S2/Ag retained a hollow spherical morphology and magnetic properties similar to Fe 3 O 4 . The synthesized Fe 3 O 4 /Ag catalytic performance was evaluated for the reduction of 4-nitrophenol (4-NP) and methyl orange (MO) dye in the presence of NaBH 4 . All catalysts effectively reduced both dyes and could be magnetically separated from the aqueous solution. The P1/Ag catalyst achieved over 95 % reduction of MO and 4-NP within 2 minutes. S2/Ag exhibited superior stability, preventing Ag leaching during the reaction. Furthermore, its high saturation magnetization allows easy magnetic extraction from the solution. These findings strongly suggest S2/Ag as a promising catalyst due to its selectivity and advantageous properties.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Zhicheng Tang,Tianwei Wang,Hua Lin,Shoulong Hao,Shufen Zhang,Rongwen Lu
Amination of 1-amino-4-bromoanthraquinone-2-sulfonic acid (BAA), crucial for anthraquinone-type dyes production, relies on Cu+ catalysis. However, Cu+ disproportionation causes catalyst deactivation, requiring large amounts of Cu catalysts (e.g., CuSO4 or CuCl) and reductants (e.g., FeSO4), introducing heavy metals and increasing water consumption to remove byproducts and metals, raising both environmental and economic costs. To address these challenges, we introduce a groundbreaking strategy for the in-situ generation of Cu+ using symmetrical Cu electrodes under alternating current (AC) electrolysis. This method achieves 100% conversion of BAA in the amination with 3,5-diamino-2,4,6-trimethylbenzene sulfonic acid (M Acid) with 95% yield, while also providing a solution to the issue of Cu+ disproportionation without the need for any additional copper catalysts or reductants, demonstrating a broad substrate scope and significantly reducing water usage in post-treatment. Characterization techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical impedance spectroscopy, reveal that the passive Cu2O film formed on the symmetrical Cu electrodes under AC electrolysis continuously generates Cu+, which is crucial for the reaction. This approach is scalable, environmentally friendly, and holds great potential for industrial applications, offering substantial economic benefits while reducing environmental impact.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 12
·12237-12246
·
IF 2.914
Yang Mi,Shi Xianyang
Biosynthesized nanocomposites are attracting growing interests because they are environmentally friendly. Ag 2 S nanoparticles (Ag 2 S NPs) are deposited in situ on the surfaces of TiO 2 nanotubes (TNTs) via Shewanella oneidensis MR-1 to form Ag 2 S/TNT nanocomposites. The prepared Ag 2 S/TNTs nanocomposites are characterized using high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and energy-dispersive X-ray spectroscopy. The results show that Ag 2 S NPs smaller than 8 nm are successfully synthesized and fabricated on the TNT surfaces with relatively uniform distribution. The catalytic performance of the Ag 2 S/TNT nanocomposites is evaluated for catalytic reduction in the presence of NaBH 4 and the photocatalytic degradation of 4-nitrophenol (4-NP) under visible light. The Ag 2 S/TNT nanocomposites show excellent catalytic activity and good stability in the 4-NP reduction process. The 4-NP degradation ratio reaches 98.3% in 50 min, and 87% conversion was achieved after eight cycles. The Ag 2 S/TNT nanocomposites also exhibit excellent photocatalytic activity for 4-NP at a rate of 0.69 h −1 , and the complete degradation of 4-NP was observed within 5 h. Therefore, this study offers an environmentally friendly approach to synthesize nanocomposites for practical applications.
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PubMed
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
·
2017
·Vol. 72
·期 4
·257-261
·
IF 0.631
Gao-Feng Wang,Xiao Zhang,Shu-Wen Sun,Hong Sun,Hui Li,Hui-Xuan Ma,Yu-Peng Tang,Xiao-Na Gao,Lei Yang
Two new copper(II) complexes, {[Cu(bipmo)(npa)]} n ( 1 ) and {[Cu(bipmo)(pa)]} n ( 2 ) (bipmo=bis(4-(1 H -imidazol-1-yl)phenyl)methanone), were synthesized by solvothermal methods and structurally characterized by elemental analyses, infrared spectroscopy, and single-crystal X-ray diffraction. The results from single-crystal X-ray diffraction data indicate that the solid state structures of 1 and 2 consist of neutral metal aromatic carboxylate layers, which are pillared by the weak interactions to generate 3D architectures. The topological structures of 1 and 2 are uninodal nets based on 4-connected nodes with the Schläfli symbol of (6 5 ·8).
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高影响因子
危险品化学品经营许可证（带存储）