ACS Applied Materials & Interfaces
·
2014
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IF 5.9
Jiantong Hu,Zhongxin Chen,Mengxiong Li,Xiaohui Zhou,Hongbin Lu
Highly efficient heterogeneous catalysts are desired for the development of new energy storage materials. The rational choice and use of capping ligands are of significant importance for performance optimization of metal nanoparticle (NP) catalysts. By exploiting amine-rich polyethylenimine (PEI) and graphene oxide (GO) as a NP support, we demonstrate that as a capping ligand, PEI deposited on GO provides a novel pathway able to simultaneously control the morphology, spatial distribution, surface active sites of cobalt (Co) NPs, and remarkably enhances their catalytic properties for the hydrolytic dehydrogenation of ammonia borane (AB). Such a synergistic effect enables the synthesized PEI-GO/Co catalysts to reveal extremely high dehydrogenation activities under atmosphere condition. A total turnover frequency of 39.9 molH2 min–1 molCo–1 and an apparent activation energy of 28.2 kJ mol–1 make the catalytic performance of these PEI-GO/Co catalysts comparable to those of noble metal-based catalysts, including bimetallic and multimetallic catalysts.
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PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
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2013
·Vol. 20
·期 10
·1-9
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IF 2.019
Liu Pengqing,Zeng Luxian,Ye Guangdou,Xu Jianjun
A series of co-polyarylates containing m -aryl ether units were synthesized from bisphenol A, 1,3-bis(4′-formylchloridephenoxy)benzene and terephthaloyl chloride via interfacial polycondensation in order to improve the processability of the bisphenol A-based polyarylate (U-polymer). The structure and properties of the co-polyarylates were characterized using infrared spectra, differential scanning calorimety, thermogravimetric analyses, wide angle x-ray diffraction and solubility testing, etc. The results show that the introduction of the asymmetry and flexible m -aryl ether units could improve the solubility obviously, but the solubility parameter of the co-polyarylate almost keeps a constant with changing the content of m -aryl ether units. As the content of m -aryl ether unit increases, the crystallization ability of the polyarylate weakens, meanwhile, the melting temperature shifts to low temperature as expected and the melting enthalpy reduces. When the content of the m -aryl ether units is higher than 60 %, the co-polyarylates become amorphous polymers. Moreover, there is almost no reduction of the thermal stability with increasing the content of the m -aryl ether units. In addition, the stability of each chemical bond of the co-polyarylate to thermal decomposition was systematically studied by means of pyrolysis-gas chromatography/mass spectrometry, and the thermal decomposition mechanism of the co-polyarylate was obtained.
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RSC Advances
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2013
·Vol. 3
·期 43
·20922-20929
·
IF 2.562
Jingjing Huang,Dong Wang,Ying Lu,Mufang Li,Weilin Xu
Antifouling nanofibers with zwitterionic materials on surfaces that can prevent the nonspecific adhesion of biomolecules and microorganism are in demand for high efficiency biosensors and affinity membranes. The functionalization of zwitterionic sulfobetaine on surfaces of PVA-co-PE nanofiber membrane via click chemistry is performed employing two synthesis routes and reported in this paper. PVA-co-PE nanofiber membranes were activated with cyanuric chloride, and then surface functionalized with sodium azide or 2-propynylamine to prepare “clickable” nanofibers with azide or alkynyl groups, respectively. The zwitterionic sulfobetaine was finally “clicked” onto PVA-co-PE nanofiber membranes. The successful surface functionalizations of PVA-co-PE nanofiber membrane were confirmed with FTIR-ATR, Raman spectroscopy, XPS and EDS. The analysis of element composition using XPS indicated that alkynylation of activated PVA-co-PE nanofiber membranes can “click” more sulfobetaines on nanofiber surfaces than surface azidation. SEM results showed that functionalized PVA-co-PE nanofiber membranes maintained well-defined nanofibrous morphology. PVA-co-PE nanofiber membranes with zwitterionic sulfobetaine demonstrated excellent antifouling performance by effectively resisting bovine serum albumin (BSA) protein adsorption.
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EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
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2017
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IF 3.756
Yue Yang,Xiaoyu Lu,Qi Liu,Yu Dai,Xiaojie Zhu,Yanli Wen,Jiaqiu Xu,Yang Lu,Di Zhao,Xijing Chen,Ning Li
Combination therapy with two drugs and nanoparticle-based drug delivery systems are widely applied to reduce the adverse effects of traditional treatment by chemotherapeutic drugs. Palmitoyl ascorbate (PA) as a lipophilic derivative of ascorbic acid shows the advantages in cancer treatment. The aim of the study was to prepare a doxorubicin (DOX) and PA co-loaded liposome to synergistically treat tumor and effectively alleviate the toxicity caused by DOX. The effects were evaluated by in vitro and in vivo studies. The liposomes (weight ratio of DOX to PA = 1:20, DOX 1 /PA 20 -LPs) exhibited the strongest synergistic effects, combination index was 0.38, 0.56, and 0.05 in MCF-7, HepG2, and A549 cells, respectively. In vitro cellular uptake study, the intercellular concentration of DOX in DOX 1 /PA 20 -LPs was 2.5-fold greater than DOX loaded liposome, and DOX 1 /PA 20 -LPs was taken in not only by macropinocytosis, but also by clathrin-mediated endocytosis. Intracellular distribution experiment showed that DOX 1 /PA 20 -LPs efficiently concentrated in the nucleus. In vivo studies indicated that co-encapsulated liposome not only showed the strongest antitumor ability by tumor growth suppression, but also significantly enhanced the safety by the change of body weight and reduced damages to other tissues (evidenced by histopathology study). These results indicated that DOX and PA co-delivery liposome successfully enhanced the anticancer efficacy and mitigated the toxicities of DOX, which displayed potential for clinical application with enhanced safety and efficacy.
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VACUUM
·
2024
·
IF 3.8
Xiaoying Yu,Chunhong Gao,Jinjia Liu,Jiang Wang,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has good stability and ecological friendliness which is used to treat organic pollutants in wastewater. In this paper, TiO 2 , 1.5%V–TiO 2 and N, V co-doped TiO 2 were synthesized by hydrothermal method for photocatalytic degradation of tetracycline. Meanwhile, XRD , HRTEM , SEM, FT-IR, XPS, UV–Vis DRS , PL and electrochemistry tests were used to characterize the catalysts. The results showed that the appropriate amount of N, V co-doped can cause structural changes of TiO 2 . The co-doped of N and V enhanced the photocurrent response of TiO 2 , increased the specific surface area, reduced the band gap, and improved the efficiency of photodegradation of tetracycline. Accordingly, the tetracycline photocatalytic degradation path was proposed. 6%N-1.5%V–TiO 2 completely degraded tetracycline into CO 2 , H 2 O and NO 3 − . The calculation results show that an appropriate amount of N, V co-doped TiO 2 decreased bandgap, improved the optical absorption performance of TiO 2 . This work demonstrated the potential of N, V co-doped to design efficient photocatalysts .
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Surfaces and Interfaces
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2024
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IF 5.7
Hongjie Ding,Dasai Ban,Cong Wang,Huali Nie,Jiaxing Huang
The Kirschner wire (K-wire) is a versatile and effective external fixator in orthopedic surgery. However, a recognized challenge associated with the use of K-wires is the potential for bacterial migration and subsequent infection as the wire passes through the skin and penetrates the bone. In this study, we developed a straightforward method for depositing antibacterial ions on K-wires by redox-assisted co-deposition. This method offers several advantages over conventional coating techniques , including uniformity, high coverage, strong adhesion , and scalability. As a result, K-wires treated with this method have a rapid and long-lasting antimicrobial effect. Both in vitro and in vivo experiments have demonstrated that these antimicrobial K-wires have an excellent bacterial elimination . The results of this study provide new opportunities for the application of robust and multifunctional antibacterial coating materials on implantable devices with great potential in the fields of orthopedics, transplantation and surgery.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zhaoyi Han,Hao Shi,Wentao Qiu,Dongdong Zhu,Wei Li,Dihua Wang
The excessive use of antibiotics like sulfamethoxazole (SMX) is causing environmental pollution and endangering human health and the ecosystem. Using transition metals as catalysts to activate persulfate (PS) can effectively degrade the organic pollutants in the advanced oxidation process (AOP). However, the high dissolution of the transition metals leads to poor stability, low efficiency in pollutant degradation, and secondary pollution. In this work, a graphitized carbon encapsulated Co (Co@EC) anode is developed for electrochemically activating peroxymonosulfate (PMS) to degrade SMX. It is found that the synergistic effect of Co@EC, PMS, and current significantly enhances SMX degradation. Under optimal conditions (current density of 5 mA cm −2 , pH of 9, and PMS concentration of 0.25 mM), the Co@EC anode can completely remove 10 μM of SMX in 9 min, a much higher efficiency compared to processes without PMS, Co, or current. The rapid reaction kinetics (6.69×10 −1 min −1 ) at optimal conditions are associated with the two main active species of 1 O 2 and O 2 • − during electroactivation. Furthermore, the Co@EC anode maintains high degradation efficiency and low dissolution after repeated cycling tests due to its structural stability. These findings provide new insights and strategies for developing stable catalysts.
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AICHE JOURNAL
·
2025
·
IF 4
Ziqi Bian,Minhao Chen,Xiaohu Ge,Ningchao Zhu,Yueqiang Cao,Hao Jiang,Jing Zhang,Gang Qian,Xinggui Zhou,Xuezhi Duan
Designing and fabricating uniformly dispersed non-precious metal active sites with tuned geometric configurations and local coordination environments for the selective conversion of functional groups to desired products is of great importance but remains challenging in industrial catalytic processes. In this work, we propose a straightforward method for synthesizing the Co 3 Sn 2 intermetallic catalyst through the structural conversion of layered double hydroxide precursors, thereby constructing suitable Sn-modified Co active sites and an optimized catalytic environment for propyne semihydrogenation. Characterizations using x-ray diffraction, high-resolution transmission electron microscopy, and x-ray absorption spectroscopy characterizations are combined to identify the formation of P6 3 /mmc Co 3 Sn 2 intermetallic phase. Catalytic performance tests show that the Co 3 Sn 2 catalyst achieves 95.0% propylene selectivity with nearly complete propyne conversion. Temperature-programmed surface reaction and desorption measurements combined with theoretical calculations demonstrate that the good selectivity is driven by the facile desorption of propylene from Sn-modified Co sites rather than its further hydrogenation.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yuxi Meng,Shaomian Liu,Yixi Wang,Wenqing Xu,Jiajian Gao,Sansan Yu,Fabing Su,Tingyu Zhu
Selective catalytic reduction of NO using CO (CO-SCR) is a promising technology for the purification of NO in the flue gas. However, the presence of O 2 significantly inhibits the activity of the CO-SCR catalyst. Herein, we synthesize a hollow Mn-doped CeO 2 @Co 3 O 4 catalyst (Mn-CeO 2 @Co 3 O 4 ), which achieved 82% NO conversion, 100% CO conversion, and 78% N 2 selectivity under 5 vol% O 2 at 200 °C, superior to those of CeO 2 @Co 3 O 4 and Co 3 O 4 @CeO 2 catalysts. The characterization results indicate that the strong electronic interaction at the heterointerfaces between Co 3 O 4 and CeO 2 plays a crucial role in promoting selective adsorption of NO. Furthermore, the Mn doping into the Co 3 O 4 lattice of the catalyst facilitates the conversion of N 2 O intermediates, thereby enhancing the overall activity. This research provides a new strategy for the design and synthesis of CO-SCR catalysts.
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CERAMICS INTERNATIONAL
·
2011
·
IF 1.472
Xinghong Zhang,Yang Hou,Ping Hu,Wenbo Han,Junting Luo
The dispersion and co-dispersion behavior of ZrB 2 and SiC nanopowders in ethanol solution was studied by sedimentation test, particle size measurement and transmission electron microscope (TEM) analysis. The dispersion behavior of ZrB 2 and SiC nanopowders in ethanol solution was strongly dependent on the pH values, types and amounts of dispersant. PEI was found to be effective for the dispersion of both ZrB 2 and SiC nanopowders in ethanol solution. With the addition of PEI, the isoelectric points of ZrB 2 and SiC nanopowders in ethanol solution were at pH 10 and pH 9.5, and shift to pH 13 and pH 12.3, respectively. The stability of ZrB 2 suspension increased with the dispersant content increasing until reached 0.7 wt% and well-dispersed SiC slurry can be obtained with more than 2.5 wt% PEI. The suitable pH value for the dispersion of ZrB 2 and SiC nanopowders should be lower than 12 and 10, respectively. The well co-dispersed ZrB 2 and SiC nanocomposite powders can be achieved by using 1 wt% or more PEI below pH 10.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zhaoxia Liu,Lili Zhao,Wangwang Tao,Rui Chen,Yu Zhou,Hongxiang Chen,Hongye Yan,Xinghua Liao
In order to obtain a kind of anticancer drug delivery carriers with good stability in blood circulation, high cellular uptake, and controlled drug release ability, folate-modified polyurethane with disulfide bonds and amino groups (FPUSN) and polyurethane with carboxyl groups (PUC) were respectively synthesized. FPUSN and PUC could co-assemble in water to form nanomicelles (FPUSN/PUC) via electrostatic interaction. When the mass ratio of FPUSN to PUC was 12, FPUSN/PUC-12 micelles had obvious negative-to-positive charge-reversal property with decreasing pH from 7.4 to 5.0. Doxorubicin-loaded micelles (FPUSN/PUC-12@DOX) with negative charges showed excellent stability under simulated normal physiological condition. However, the charge-reversal happened at pH 6.5 and positive charges increased with the pH decrease. When the glutathione concentration was 10 mM, the structure of FPUSN/PUC-12@DOX micelles was broken. So FPUSN/PUC-12@DOX micelles exhibited significant acid/reduction-sensitive drug release properties and then DOX could be rapidly released in simulated tumor intracellular environment. Cellular experimental results demonstrated that FPUSN/PUC-12 micelles could enhance cellular uptake under acid condition and FPUSN/PUC-12@DOX micelles had better anti-proliferation effect against HGC-27 cells at pH 6.5 than that at pH 7.4 owing to multi-responsive synergistic effects. Therefore, FPUSN/PUC micelles will have great application potential as drug delivery carriers for enhancing anticancer efficacy.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Mohit Kumar,Bhimanaboina Ramulu,Jae Su Yu
To produce clean and green hydrogen energy from electrolytic water, better electrocatalytic materials need to be developed. Herein, we reported the development of a Ti3C2 MXene@Ni/Co sulfide hybrid material for the use in hydrogen evolution reaction (HER) process, which is effective and stable. The shape of metal sulfide and its interactions with Ti3C2 MXene caused electronic coupling. This increased both the exposed metal sulfide's active edge sites and the charge-transfer speed. When compared with pure MXene and Ti3C2 MXene@NiS nanostructure, Ti3C2 MXene@Co4S3 exhibited outstanding electrocatalytic activity and stability in the HER process. The unique properties of the skeletal structure and the robust interface interaction between Co4S3 and MXene are responsible for the superior performance of Ti3C2 MXene@Co4S3 in the HER process. Our research offers a practical method to synthesize specialized nanostructures for electrocatalysis, electronics, and other applications.
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