CATALYSIS LETTERS
·
2021
·Vol. 151
·期 7
·2144-2152
·
IF 3.186
Guo Yu,Tian Long,Yan Wangwei,Qi Ronghua,Tu Weixia,Wang Zhou-jun
Abstract Three typical methods, subsequent coating, co-impregnation and sequential impregnation, were employed to investigate the effect of introduction methodologies for CeO 2 -promoted Ni/SiO 2 catalysts. The CeO 2 @Ni/SiO 2 catalyst prepared with the subsequent coating method was found to exhibit the best initial activity and superior long-term stability in CO 2 reforming of methane. Comparative characterizations documented that small Ni size and intimate Ni–CeO 2 contact were generated on the CeO 2 @Ni/SiO 2 catalyst, leading to excellent reforming activity. In addition, pronounced redox property and strong surface basicity were created on the CeO 2 @Ni/SiO 2 catalyst, resulting in exceptional coke resistance and thus superior long-term stability. This work unravels the impact of various introduction methods on the catalyst structure, which would help design robust nanocomposite catalysts with outstanding catalytic performance. Graphic Abstract
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JOURNAL OF CLUSTER SCIENCE
·
2020
·Vol. 32
·期 6
·1553-1561
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IF 1.731
Jia Jinliang,Liu Qingle,Jin Xiaoyong,Xu Hanhong
Fluorescent gold nanoclusters (Au NCs) have attracted considerable interest in biological application. Here, we reported a novel Au NCs with blue fluorescence, conjugated with glycine (Gly) and rotenone (R). The structure and properties of Au–BSA–Gly–R conjugates were characterized by transmission electron microscopy (TEM), UV–visible, fluorescence spectroscopy, Fourier transform infrared spectroscopy (FTIR) and Zeta potential measurement. The results of fluorescent microscopic imaging revealed that the Au NCs with different ligands were capable of being selectively uptaken by Spodoptera frugiperda (Sf9) cells. Furthermore, the gold content of Au–BSA–Gly–R in Sf9 cells was 2.2 and 2.6 times higher than that of Au–BSA and Au–BSA–R, respectively. It illustrated that nanoparticles after conjugated with Gly could gain specificity to intracellular transportation. This study indicated that the Au NCs after mediated by Gly not only had great potential for applications in insect cell imaging, but also could play an important role of amino acid for agrochemicals delivery in agricultural fields.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 10
·12648-12658
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IF 3.056
Zhu Junfeng,Gao Weichun,Zhao Wentian,Ge Lei,Zhu Ting,Zhang Guanghua,Niu Yuhua
Heavy metal lead is a typical widespread potentially toxic element (PET) contamination due to their extensive and wide applications in industrial processes. The development of cost-effective methods for preventing potentially toxic element lead residues from soil into food is thus highly desirable. A new type of humic acid-based remediation material (HA/WV) incorporating humic acid salt (HA), biochar powder (BC), and wood vinegar (WV), which is a cheap and environmentally friendly industrial by-product from charcoal processing, was prepared and evaluated. The results showed that 0.10 g remediation material HA/WV with a mass ratio of 1:1 was added to 1 kg surface soil of 0–20 cm from agricultural land contaminated by 300 mg Pb 2+ , the reduction ratio of available Pb in soil can reach 61.4%. Especially, wood vinegar can enhance the reduction ratio of available Pb by at least 14.7% over without wood vinegar. Furthermore, according to the analysis of adsorption interaction and the electrostatic attraction between Pb(II) and oxygen-containing functional groups on HA/WV are the dominant mechanisms responsible for Pb(II) sorption. The wood vinegar liquid can improve the oxygen-containing group in HA/WV, which can enhance the complexation of remediation materials and Pb(II) ion.
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PubMed
高影响因子
FIBERS AND POLYMERS
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2020
·Vol. 21
·期 9
·1888-1893
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IF 1.797
Mao Yu,Ni Lingli,Yang Changyou,Cai Peng,Du Weigang,Gao Xiaoyan
Palygorskite (PAL) is a natural fibrous clay mineral which attracted tremendous attention as reinforcing agent to polymers. In this paper, a facile and environmental friendly modification process of PAL by poly acrylic acid (PAA) via in-situ polymerization in PAL/water gel has been reported. The effects of PAA modified PAL (PAA-PAL) on the mechanical and thermal properties of waterborne polyurethane (WPU) nanocomposites have been investigated. Scanning electron microscopy (SEM) demonstrated that the dispersion of PAL has improved dramatically after PAA modification. Tensile tests showed that PAA-PAL has a significant reinforcement effect on WPU matrix. Addition of 10 wt% PAA-PAL, the tensile strength and the Young’s modulus of WPU composites increased 235 % and 388 %, respectively. Furthermore, the thermal stability of WPU also has been distinctly improved via addition of PAA-PAL.
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 6
·1670-1682
·
IF 2.482
Zhu Tianhan,Song Hua,Li Feng,Chen Yanguang
A series of bimetallic Ni x Cu (10- x ) /SiO 2 (where x is the mass fraction of Ni and the total metal loading was fixed at 10 wt%.) catalysts with different Ni/Cu mass ratio are prepared and characterized by X-Ray diffraction (XRD), N 2 adsorption-desorption, inductively coupled plasma mass spectrometry (ICP-MS), H 2 temperature-programmed reduction (H 2 -TPR) and transmission electron microscope (TEM). The benzofuran (BF) hydrodeoxygenation (HDO) performance of as-prepared catalysts are evaluated in a fixed flow reactor. The results showed that the incorporation of Cu to Ni/SiO 2 catalyst can increase surface area of catalyst and improve the reducibility of nickel oxide species, which contributed to higher catalytic activity and total deoxygenated compounds yield. Moreover, the strong synergistic effect between Ni and Cu led to the formation of NiCu alloy at the Ni mass fraction of 5 wt% and thus induced smaller crystallite size and exposure of more active particles, which inevitably contributed to the improved HDO performance for Ni 5 Cu 5 /SiO 2 catalyst. At 300 °C, 3.0 MPa, MHSV=3.0 h −1 and H 2 /oil = 500(v/v), the total yield of deoxygenated products over Ni 5 Cu 5 /SiO 2 catalyst reached 86.0%, which is increased by 10.8% and 77.4% as compared to those of monometallic Ni/SiO 2 (75.2%) and Cu/SiO 2 catalysts (8.8%), respectively. Finally, a possible reaction network for HDO of BF on Ni 5 Cu 5 /SiO 2 catalyst was proposed. Graphic Abstract
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IONICS
·
2020
·Vol. 27
·期 1
·375-387
·
IF 2.394
Wei Shou-lian,Yan Liang-jie,Huang Xiang-jin,Li Jian-wen,Yao Su,Zhang Hua-sheng,Xu Ai-zhen
This work describes the development of a simple, effective, and sensitive electrochemical sensor based on a glassy carbon electrode (GCE) modified with carboxylated carbon nanosheets (cCNSs) and poly(glutamic acid) (PGA) for the simultaneous detection of trace amount of Cd(II) and Pb(II) by differential pulse anodic stripping voltammetry (DPASV). The cCNSs were introduced to increase the effective surface area and electron transport efficiency of the sensor, while PGA acting as a capturer could capture target metal ions and eventually enhance the selectivity and sensitivity in the detection of Cd(II) and Pb(II). The designed sensor showed a linear range of 1.0–100.0 μg/L for both metal ions, with detection limits (S/ N = 3) of 0.13 μg/L for Cd(II) and 0.15 μg/L for Pb(II), respectively. The sensor was applied to the simultaneous detection of Cd(II) and Pb(II) in the water and rice samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry (GFAAS). It also gave excellent performance with regard to its selectivity, recovery, stability, and reproducibility.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 5
·1353-1361
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IF 4.157
Sun Qi-Xuan,Wei Xing,Zhang Shang-Qing,Chen Ming-Li,Yang Ting,Yu Yong-Liang,Wang Jian-Hua
Copper transporter 1 (CTR1) is a transport protein involved in copper and cisplatin uptake. The visualization of cellular CTR1 migration and its redistribution is highly important in copper/cisplatin exposure/transport. However, to the best of our knowledge, this is a highly challenging task. Herein, a dual-mode imaging strategy for CTR1 is developed by hyphenating confocal laser scanning microscopy (CLSM) and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) with a fluorescent/elemental bifunctional tag conjugated with anti-CTR1 antibody. The tag consists of rhodamine B and zirconium metal-organic frameworks (Zr-MOF) for CLSM fluorescence imaging and LA-ICPMS element imaging for a same group of HepG2 cells in a designated visual zone. This dual-mode imaging strategy facilitates visualization of CTR1 migration and meanwhile provides information of CTR1 redistribution in HepG2 cells by uptake of divalent copper or cisplatin. The present dual-mode imaging strategy provides in-depth information for the elucidation of CTR1 involved biological processes.
Graphical abstract
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 1
·1-11
·
IF 5.833
Chen Hengye,Liu Rui,Guo Xiaoming,Deng Gaoqiong,Xu Lu,Zhang Lei,Lan Wei,Zhou Chunsong,She Yuanbin,Fu Haiyan
Caffeine naturally occurs in tea and cocoa, which is also used as an additive in beverages and has pharmacological effects such as refreshing, antidepressant, and digestion promotion, but excessive caffeine can cause harm to the human body. In this work, based on the specific response between nano zinc 5, 10, 15, 20-tetra(4-pyridyl)-21H-23H-porphine (nano ZnTPyP)-CdTe quantum dots (QDs) and caffeine, combined with chemometrics, a visual paper-based sensor was constructed for rapid and on-site detection of caffeine. The fluorescence of QDs can be quenched by nano ZnTPyP. When caffeine is added to the system, it can pull nano ZnTPyP off the surface of the QDs to achieve fluorescence recovery through electrostatic attraction and nitrogen/zinc coordination. The detection range is 5 × 10 −11 ~3 × 10 −9 mol L −1 , and the detection limit is 1.53 × 10 −11 mol L −1 ( R 2 = 0.9990) ( S / N = 3). The paper-based sensor constructed exhibits good results in real samples, such as tea water, cell culture fluid, newborn bovine serum, and human plasma. Therefore, the sensor is expected to be applied to the rapid instrument-free detection of caffeine in food and biological samples. Graphical abstract
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高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 10
·期 1
·108-119
·
IF 2.889
Yin Changzhi,Yu Zezong,Shu Longlong,Liu Laijun,Chen Yan,Li Chunchun
A melilite Ba 2 CuGe 2 O 7 ceramic was characterized by low sintering temperature and moderate microwave dielectric properties. Sintered at 960 °C, the Ba 2 CuGe 2 O 7 ceramic had a high relative density 97%, a low relative permittivity ( ε r ) 9.43, a quality factor ( Q×f ) of 20,000 GHz, and a temperature coefficient of resonance frequency (τ f ) −76 ppm/°C. To get a deep understanding of the relationship between composition, structure, and dielectric performances, magnesium substitution for copper in Ba 2 CuGe 2 O 7 was conducted. Influences of magnesium doping on the sintering behavior, crystal structure, and microwave dielectric properties were studied. Mg doping in Ba 2 CuGe 2 O 7 caused negligible changes in the macroscopic crystal structure, grain morphology, and size distribution, while induced visible variation in the local structure as revealed by Raman analysis. Microwave dielectric properties exhibit a remarkable dependence on composition. On increasing the magnesium content, the relative permittivity featured a continuous decrease, while both the quality factor and the temperature coefficient of resonance frequency increased monotonously. Such variations in dielectric performances were clarified in terms of the polarizability, packing fraction, and band valence theory.
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高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 12
·7183-7198
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IF 2.014
Sun Manxi,Qiu Jianhui,Jin Shuping,Huang Hongjian,Liu Wendi,Sakai Eiichi,Lei Ji
Poly(vinyl alcohol) (PVA) hydrogels are widely used as biomimetic cartilage materials for its good biocompatibility and shock absorbing ability. However, the application of pure PVA hydrogel prepared through freezing–thawing method is limited by its disadvantages such as high flexibility and low mechanical strength. To solve these barriers, a biobased monomer, i.e., epoxidized soybean oil (ESO), was used to modify PVA to formulate a series of ESO cross-linked PVA (PVA-ESO) hydrogels. Infrared spectroscopy (FT-IR), X-ray diffraction and thermogravimetric analyses were used to confirm the formation of PVA-ESO copolymer. Scanning electron microscope revealed that the formed PVA-ESO hydrogels presented a distinct porous structure, while no obvious pores were observed on pure PVA hydrogel. The tensile strength of PVA-ESO hydrogels increased up to 2.4 times when compared to that of pure PVA hydrogel. Dynamic mechanical analysis indicated that the elastic properties of PVA-ESO hydrogels are better than that of pure PVA hydrogel, which are similar to that of natural cartilage. In summary, the modification of PVA with ESO can improve the thermal stability and mechanical properties of the hydrogels due to the improved cross-linking degree and the formed hydrophobic association.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 13
·7862-7878
·
IF 4.22
Cao Xue-Fang,Yue Pan,Wei Qiu-Rui,Dang Yun-Fei,Zhang Si-Qi,Wei Zhi-Xian,Wang Rong-Zhen
In this study, a solar-driven photocatalyst La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. Results show that p – n heterojunction was formed, and it has considerable photocatalytic properties under ultraviolet light and solar irradiation. More importantly, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) also exhibits Fenton-like catalytic performance in the presence of H 2 O 2 and oxalic acid (OA). The main reactive radicals of the La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 –H 2 O 2 –OA–sunlight system are h + , · OH and · O 2 − . The chemical oxygen demand removal rate of MO wastewater in La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%)–H 2 O 2 –oxalic acid–sunlight system reached 72.4%; the value was higher than that of the sum of single photocatalysis (34.5%) and Fenton-like-dark system (27.6%), indicating that there is a synergistic effect between the photocatalysis and Fenton-like on MO degradation. In addition, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) displays approximately superparamagnetism and has higher saturated magnetization ( M s ), low coercive force and residual magnetism. So it can be easily recovered by an external magnetic field and can be reused 6 times. It was anticipated that La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure is a stable and reusable solar-light-driven magnetic photocatalyst and has great potential applications for wastewater treatment. Graphical abstract The magnetic La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized by different methods. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. It is not only a solar-driven photocatalyst with high efficiency, but also shows excellent Fenton-like catalytic effect. And the photocatalysis and Fenton-like system exhibited synergetic catalytic effect on MO degradation by La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%). Furthermore, near superparamagnetic characteristics of the catalyst make it easy to recycle by the external magnetic field and can be reused for 6 times, suggesting that it is a stable multifunctional catalyst.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 1
·138-149
·
IF 5.693
Liu Chao,Yin Qing,Li Xi,Hao Lifen,Zhang Wenbo,Bao Yan,Ma Jianzhong
Water-based polymers have been widely used in coating materials, but their durability and service life are often greatly reduced due to macroscopic damage or cracking caused by external forces. In this paper, poly(propylene glycol) terminated with ortho-amiomethylphenyl diboronic acid (AMPBA-PPG) and cross-linked polymer containing boroxine (CLP-boroxine) were synthesized by nucleophilic substitution. Then the CLP-boroxine was introduced into waterborne polyurethane (WPU) to prepare AMPBA-PPG/WPU composite emulsion for leather finishing and CLP-boroxine/WPU composite film. The self-healing characterization results showed that the self-healing efficiency of the 15 wt% CLP-boroxine/WPU film was as high as 93.6% after only 4 h of water stimulation at room temperature. Compared with neat WPU finished leather, the leather samples finished with AMPBA-PPG/WPU exhibited more excellent wear-resistance. More importantly, the leather coating finished with AMPBA-PPG/WPU still showed nice wear-resistance even after wear and self-healing treatment. These results are attributed to that the hydrogen bonds between AMPBA-PPG and WPU, WPU, and WPU, and the dynamic reversible covalent bonds in AMPBA-PPG can improve/increase the self-healing efficiency of the composite coating. In addition, the boron hydroxyl groups in AMPBA-PPG could also react with the hydroxyl groups on the leather surface, thereby further improving the wear-resistance of the leather coating. Graphical abstract Dynamic boronate ester bonds can not only endow WPU excellent self-healing properties but also improve wear-resistance of its leather coating.
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危险品化学品经营许可证（带存储）