MICROPOROUS AND MESOPOROUS MATERIALS
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2013
·
IF 3.365
Lan-Lan Lou,Huanling Du,Yanbin Shen,Kai Yu,Wenjun Yu,Qiu Chen,Shuangxi Liu
Chiral 9-amino epi -cinchonine was anchored on external surface passivated SBA-15 as well as calcined SBA-15. The two resulting materials were used as catalysts for the asymmetric transfer hydrogenation of aromatic ketones after complexing with [Ir(COD)Cl] 2 . Higher enantioselectivities were obtained over the passivated SBA-15 supported catalyst compared with the catalyst based on calcined SBA-15 as well as the homogeneous counterpart. Especially for the substrate of acetophenone, an obviously high enantiomeric excess (ee) of 74% (homogeneous ee: 60%) was achieved with comparable conversion to the homogeneous catalyst (97% vs. 98%). Furthermore, the passivated SBA-15 supported catalyst demonstrated higher stability during the asymmetric transfer hydrogenation reaction as compared with the catalyst based on calcined SBA-15.
研究领域:
催化化学
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有机合成
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材料化学
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纳米材料
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均相与多相催化
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DOI
高影响因子
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
·
2016
·
IF 3.773
Qinfu Zhao,Xiudan Wang,Yue Yan,Da Wang,Ying Zhang,Tongying Jiang,Siling Wang
In this study, we synthesized a kind of hollow mesoporous carbon (HMC) as near-infrared (NIR) nanomaterial and made a comparison between HMC and IR-820 commercially available in terms of heat generation properties and thermal stability exposed under NIR laser irradiation . The NIR-induced photothermal tests indicated that HMC had excellent heat generating capacity and remained stable after exposed to NIR laser irradiation for several times. On the contrary, the IR-820 was thermal unstable and degraded completely after exposed to NIR laser irradiation for only one time. The anticancer drug DOX was chosen as a model drug to evaluate the loading capacity and release properties of carboxylated HMC (HMC-COOH). The drug loading efficiency of HMC-COOH could reach to 39.7%. In vitro release results indicated that the release rate of DOX was markedly increased under NIR laser irradiation both in pH 5.0 and pH 7.4 PBS . Cell viability experiments indicated that HMC-COOH/DOX has a synergistic therapeutic effect by combination of chemotherapy and photothermal therapy . This present research demonstrated that HMC could be employed as NIR-adsorbing agents as well as drug carriers to load lots of drug, realizing the synergistic treatment of chemotherapy and photothermal therapy.
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ACS Applied Energy Materials
·
2026
·
IF 5.5
Yi Cao,Hao Ren,Tianjiao Ling,Junli Zhu,Yuanyuan Zhang,Lan Hong,Minqi Sheng
Precious metal-based catalysts exhibit superior performance over non-precious metal-based counterparts in acidic water splitting due to their relatively high corrosion resistance. However, their catalytic performance, especially in terms of mass activity and durability, is yet to be improved to meet commercial requirements. Herein, ultrathin porous Ir−Co−P alloy nanosheets (∼2.14 nm thick) with abundant grain boundaries, denoted as Ir−Co−P 340, were successfully synthesized via a KOH-assisted calcination and sequent phosphidation. The distinctive two-dimensional morphology exposes more surface atoms, shortens charge diffusion distances, and induces strong physical repulsion to prevent aggregation, while numerous pores facilitate efficient electrolyte penetration. The abundant grain boundaries not only proliferate active sites but also stabilize microstructures through a pinning effect. Dual alloying with Co and P enhances intrinsic catalytic activity and conductivity while reducing the cost of the catalyst. As a bifunctional catalyst in 0.5 M H2SO4 solution, Ir−Co−P 340 exhibited remarkable precious metal mass activities of 11.09 A mgIr−1 (HER, −0.03 Vvs.RHE) and 2.56 A mgIr−1 (OER, 1.26 Vvs.RHE), approximately 2.04 and 8.5 times higher than those of Pt/C and rutile-IrO2, respectively. A symmetric PEM electrolysis cell (Ir−Co−P 340||Ir−Co−P 340) delivered an ultralow cell voltage of 1.49 V at 10 mA cm−2 and outstanding durability over 200 h at a high current density of 50 mA cm−2.
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DOI
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Food Quality and Safety
·
2026
·
IF 4.9
Li Xiangyu,Liu Yingfei,Luo Yanbo,Jiang Xingyi,Chai Ying,Qiao Yuemei,Zhang Hongfei,Zhu Fengpeng,Pang Yongqiang,Chen Di
Nicotinamide mononucleotide (NMN) has gained significant attention as a promising anti-aging and health-promoting supplement, driving the development of efficient and sustainable production methods. Among these methods, enzymatic synthesis has emerged as a highly specific and environmentally friendly approach. This study presents a comprehensive evaluation of NMN synthesized via two key enzymatic pathways—nicotinamide riboside kinase (NRK)-mediated and nicotinamide phosphoribosyltransferase (NAMPT)-mediated routes—along with commercially available raw NMN materials. Key quality attributes, including purity, content, moisture levels, thermal stability, and biological activity, were systematically assessed. Results show that NAMPT-synthesized NMN consistently achieves 100% purity, matching pharmaceutical-grade standards, while NRK-synthesized NMN displays batch-dependent variability, with purity ranging from 92.13% to 96.19%. Stability analysis reveals that NAMPT-derived NMN maintains high thermal stability, whereas NRK-derived NMN undergoes significant physical and chemical degradation at elevated temperatures, with nicotinamide as the primary degradation product. Additionally, bioactivity testing demonstrated that NAMPT-derived NMN retains significantly higher biological activity compared with NRK-synthesized and commercial NMN. These findings provide essential data for optimizing NMN production processes and support the establishment of industry-wide quality control standards.
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Dan Du,Zhirong Qu,Weiwei Zhang,Hong Dong,Chuan Wu
The density, viscosity and speed of sound of trimethoxylsilane derivatives with ethanol, 1-butanol, 1-pentanol and 1-octanol have been measured at 298.15, 303.15, 308.15, 313.15 K, 318.15 and 323.15 K, respectively. The excess molar volume, viscosity deviation, excess Gibbs energy of activation of viscous flow, isobaric thermal expansivity and isentropic compressibility deviation were calculated from these results. The Redlich–Kister equation was used for the correlation. The calculated excess properties have been discussed according to the possible interactions formed between the molecules in the mixture using equimolar attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. In all of the compositions and experimental temperature ranges studied, the excess molar volumes were found to be negative for vinyl trimethoxy silane and phenyl trimethoxy silane with ethanol. This may be attributed to the close accumulation of molecules and easier formation of cross-association structures between the alkoxysilane molecules. However, the excess molar volume of the binary mixture of vinyl trimethoxy silane and phenyl trimethoxy silane with n -butanol, n -pentanol, and n -octanol was positive. Hydrogen bond fracture may play a leading role in this process. The excess molar volumes of the binary system comprised of trifluoropropyl trimethoxy silane with ethanol and 1-octanol were all positive. This may be attributed to the influence of steric hindrance, which makes it difficult for trifluoropropyl trimethoxy silane to form a cross-association structure with alcohol molecules.
研究领域:
物理化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Rongying Zhu,Renqin Yu,Kun Yin,Shiming Zhang,Joey Chung-Yen Jung,Yufeng Zhao,Menggang Li,Zhonghong Xia,Jiujun Zhang
Developing highly active methanol oxidation electrocatalysts with superior anti-CO poisoning capability remains a grand challenge. Herein, a simple strategy was employed to prepare distinctive PtFeIr jagged nanowires with Ir located at the shell and Pt/Fe located at the core. The Pt 64 Fe 20 Ir 16 jagged nanowire possesses an optimal mass activity of 2.13 A mg Pt -1 and specific activity of 4.25 mA cm −2 , giving the catalyst a great edge over PtFe jagged nanowire (1.63 A mg Pt -1 and 3.75 mA cm −2 ) and Pt/C (0.38 A mg Pt -1 and 0.76 mA cm −2 ). The in-situ Fourier transform infrared (FTIR) spectroscopy and differential electrochemical mass spectrometry (DEMS) unravel the origin of extraordinary CO tolerance in terms of key reaction intermediates in the non-CO pathway. Density functional theory (DFT) calculations add to the body of evidence that the surface Ir incorporation transforms the selectivity from CO pathway to non-CO pathway. Meanwhile, the presence of Ir serves to optimize surface electronic structure with weakened CO binding strength. We believe this work will advance the understanding of methanol oxidation catalytic mechanism and provide some insight into structural design of efficient electrocatalysts.
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产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Lele Jin,Wenzhi Li,Qiying Liu,Longlong Ma,Song Li,Yang Liu,Baikai Zhang,Qi Zhang
The liquid fuel (made of C 5 /C 6 alkanes) was obtained directly from the hydrogenolysis of microcrystalline cellulose (MCC) with Ir-VO x /SiO 2 combined with HZSM-5 as the composite catalyst in a biphasic system (n-dodecane + H 2 O). The performance of the catalyst was investigated by carrying out a series of experiments using various V/Ir molar ratios , catalyst dosages, reaction temperatures, reaction time, hydrogen pressure and substrates. At the optimized conditions, the cellulose was almost completely converted, and at the same time, a high C 5 /C 6 yield of 85.1% was obtained at 210 °C for 24 h and 6 MPa with the V/Ir molar ratio being 0.13. These results not only proved that Ir-VO x /SiO 2 (V/Ir = 0.13) has excellent performance for the hydrogenolysis of MCC to liquid alkanes, but also indicated that vanadium is a good metal promoter for iridium . In addition, it was proven the C5/C6 alkanes were obtained via sorbitol through the combined effect of Ir-VO x /SiO 2 and HZSM-5.
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产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 2
·322
·
IF 3.9
Kai Che,Xiaoyang Zhu,Guangshi Tang,Man Zhao,Junqing Pan
The hydrometallurgical technology provides an efficient and sustainable green lead recovery process from lead acid batteries. Methanesulfonic acid has been widely considered as a green solvent for lead electrolytic recovery. However, the competitive precipitation of PbO2at anode and higher overpotential for OER limit the lead recovery efficiency. In this work, an anodic oxygen evolution reaction (OER) catalyst with a low Ir mass fraction of 7.2% is obtained by electroplating iridium on carbon cloth (CC), exhibiting a lower overpotential of 256 mV, longer lifetime of 10 h, and better stability in the 0.5 M MSA solution. When CC-Ir is used as an anodic catalyst for lead recovery in the lead methanesulfonate electrolyte, only a lesser Pb precipitation product with Pb atom mass fraction of 1.42% is found after electrolysis of 10 h, demonstrating the suppression effect of CC-Ir for a PbO2side reaction. This work proves that the anodic catalyst plays an important role in the lead electrolytic recovery process, which can inhibit the side reaction, reduce the energy consumption, and increase recovery efficiency.Keywords:oxygen evolution reaction;noble metal catalyst;electroplating;lead methanesulfonate
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 47
·期 6
·7123-7134
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IF 2.807
Wang Pengjie,Xiong Liping,He Zhongyi,Xu Xin,Hu Jianqiang,Chen Qi,Zhang Renhui,Pu Jibin,Guo Lei
The corrosion inhibition effect and synergistic mechanism of novel imidazoline derivative (SMIF) and benzimidazole (BMZ) in 3.5 wt% simulated concrete solution were studied experimentally and theoretically. The complex inhibitors have the most outstanding inhibition efficiency when SMIF concentration is 0.1 g/L and BMZ is 0.9 g/L, the corrosion inhibition efficiencies of weight loss, Electrochemical Impedance Spectroscopy and Potentiodynamic polarization curve (Tafel) were 88.81%, 86.27% and 90.22%, respectively. Electrochemistry analysis results proved that the corrosion inhibition mechanism of the inhibitors in the corrosion solution was mainly the formation of a protective film on the surface of carbon steel. FT-IR, Energy Dispersive Spectroscopy and X-ray Photoelectron Spectroscopy all proved the existence of the protective film. Molecular dynamics proved that the composite inhibitor molecules could be stable on the surface of carbon steel and when consist of complex inhibitor was 0.1 g/L SMIF and 0.9 g/L BMZ the stable adsorption morphology were the highest. This work confirmed that SMIF and BMZ inhibitors have a good synergistic effect, greatly improving the inhibition efficiency and reducing the cost of corrosion inhibition, and has a certain guiding significance for synergistic inhibition.
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DOI
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Advanced Science
·
2022
·Vol. 9
·期 15
·2106120
·
IF 17.521
Peng Wang,Yu Chu,Abudukadi Tudi,Congwei Xie,Zhihua Yang,Shilie Pan,Junjie Li
Design and fabrication of new infrared (IR) nonlinear optical (NLO) materials with balanced properties are urgently needed since commercial chalcopyrite-like (CL) NLO crystals are suffering from their intrinsic drawbacks. Herein, the first defect-CL (DCL) alkali-earth metal (AEM) selenide IR NLO material, DCL-MgGa 2 Se 4 , has been rationally designed and fabricated by a structure prediction and experiment combined strategy. The introduction of AEM tetrahedral unit MgSe 4 effectively widens the band gap of DCL compounds. The title compound exhibits a wide band gap of 2.96 eV, resulting in a high laser induced damage threshold (LIDT) of ≈3.0 × AgGaS 2 (AGS). Furthermore, the compound shows a suitable second harmonic generation (SHG) response (≈0.9 × AGS) with a type-I phase-matching (PM) behavior and a wide IR transparent range. The results indicate that DCL-MgGa 2 Se 4 is a promising mid-to-far IR NLO material and give some insights into the design of new CL compound with outstanding IR NLO properties based on the AEM tetrahedra and the structure predication and experiment combined strategy.
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DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 22
·13660-13672
·
IF 4.036
Xiaofan Zhang,Ming Gao,Tingting Liu,Huili Wang,Xuedong Wang
Herein, we fabricated three imidazolium-based polymeric ionic liquids (PILs) with different anions (P[VEIM]BF4, P[VEIM]PF6 and P[VEIM]Br), and analyzed their differential extraction efficiencies for bifenthrin through H-bonding induced effects. Three PILs all presented an irregular block structure with rough surface and lower specific-surface area (SSA, 11.2–18.7 m2 g−1) than carbon-based nanomaterials. They formed hydrogen bonds with free-water molecules in the lattice of PILs, including C2,4,5–H⋯O–H, Br⋯H–O–H⋯Br, O–H⋯Br, C2,4,5–H⋯F–P, P–F⋯H–O–H⋯F–P, C2,4,5–H⋯F–B and B–F⋯H–O–H⋯F–B. After extraction, the O–H stretching-vibration peak was prominently intensified, whereas the C–H bond varied slightly concomitant with reduced B–F and P–F vibration. Theoretically, the C–H vibration should become more intense in the C4,5–H⋯H2O and C2–H⋯H2O bonds after extraction in contrast to before extraction. These contrary spectral changes demonstrated that the hydrogen bonds between cations in the PILs and free-water molecules were broken after extraction, yielding the H-bonding occurrence between bifenthrin and H–O–H in the lattice. As a time indicator for the free-water binding and releasing process, the highest slope for the plot of It/I0 against time implied that the shortest time was required for P[VEIM]PF6 to reach an adsorption equilibrium. Overall, the strong hydrophobicity, small SSA and electrostatic-repulsion force for P[VEIM]PF6 are all not conducive to its efficient adsorption. Beyond our anticipation, P[VEIM]PF6 provided the highest extraction recovery for bifenthrin up to 92.4% among three PILs. Therefore, these data lead us to posit that the above high efficiency results from the strongest H-bonding effect between P[VEIM]PF6 and bifenthrin. These findings promote our deep understanding of PILs-triggered differential efficiency through a H-bonding induced effect.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 13
·19221-19232
·
IF 4.672
Vi Thuy Thi Phan,Toan Minh Pham,Hau Quoc Pham,Tai Thien Huynh,Thi Hong Tham Nguyen,Van Thi Thanh Ho
Summary Highly stable and cost-effective electrocatalysts are of importance in regulating energy conversion efficiency and commercial feasibility of direct methanol fuel cells (DMFCs). So far, integrating transition metals into Pt-based catalysts to enhance their catalytic performances for methanol electro-oxidation reaction (MOR) at the anode of DMFCs has received significant interest. This study witnessed the first time of depositing Pt 3 Co 1 alloy nanoparticles (NPs) on robust Ti 0.9 Ir 0.1 O 2 supports utilizing a modified reduction method that used NaBH 4 as a reducing agent in the absence of surfactants or stabilizers. This novel combination not only reduces the usage of costly and easily-deactivated Pt but also significantly improves catalytic activity and poisoning tolerance for MOR. Regarding electrocatalytic performance, the onset potential and the mass activity of the Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst are ~0.1 V vs NHE and 316.16 mA/mg Pt , respectively, which are 4.5-fold lower and 1.5-fold higher than the corresponding figures for the commercial Pt/C (E-TEK) catalyst, ~0.45 vs NHE and 206.83 mA/mg Pt , indicating superior catalytic activity and CO-tolerance of the former over the latter. Furthermore, the superior anti-poisoning ability and stability of the Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst are demonstrated by its 2.2-fold higher I f /I b ratio in MOR and lower degradation rate in the 60-min chronoamperometry (CA) and 3000-cycle scanning tests than the Pt/C counterpart. These enhancements could be abscribed to synergistic influence between the Pt-Co alloy NPs and the robust Ti 0.9 Ir 0.1 O 2 support. The addition of Co into the catalyst to promote removal of Pt-poisoning species as well as the use of highly corrosion-resistant Ir-doped TiO 2 as a catalyst support play a decisive role in boosting electrochemical behaviors of the Pt 3 Co 1 / Ti 0.9 Ir 0.1 O 2 catalyst. Generally, the success of this work in synthesizing high-performance Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst could serve as groundwork for further development of TiO 2 -based material supported bimetallic catalysts for applications in the electrochemical catalysis field.
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危险品化学品经营许可证（带存储）