FOOD CHEMISTRY
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2021
·
IF 7.514
Yi-Ping Cao,Gao-Ying Zhi,Li Han,Queting Chen,Dong-Hao Zhang
To improve the performance of lipase in biosynthesis of benzyl cinnamate, a new immobilized lipase by entrapping enzyme into nano-molecular cages was designed. Consequently, the entrapped lipase showed a robust immobilization, which diminished the leakage of lipase notably in use. Moreover, the entrapped lipase exhibited higher activity (57.1 U/mg) than free lipase (50.0 U/mg), demonstrating that the native conformation of lipase was not destroyed during immobilization. Compared with the adsorbed lipase (half-life 40.7 min) and free lipase (half-life 29.8 min), the entrapped lipase (half-life 85.3 min) increased the stability by about 2–3 times. Furthermore, the entrapped lipase was applied in biosynthesis of benzyl cinnamate, where it showed excellent activity and re-usability. After 7 cycles, the yield of benzyl cinnamate catalyzed by the entrapped lipase remained 70.2%, while the yield catalyzed by the adsorbed lipase was only about 10%. These results indicated that the nano-molecular cages could inhibit denaturation of lipase and maintain its activity well.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 17
·4035-4043
·
IF 6.569
Ruxin Liu,Wenjun Zhang,Guojing Li,Wenjing Liu
Advanced anti-counterfeiting materials have great research significance in the fields of economy, safety and human health. Compared with independent color mixed anti-counterfeiting materials, ultraviolet (UV) excitation wavelength-dependent discoloration, which can realize the change of the emission peak shape and color under different excitation wavelengths, is more attractive. In this work, the Sb-doped Cs2ZrCl6 vacancy-ordered double perovskite was designed and synthesized for anti-counterfeiting materials. Due to the singlet and triplet transitions of Sb3+ ions and self-trapping exciton (STE) emission of the Cs2ZrCl6 host, the material showed emission variability from blue to orange-yellow color. In addition, room temperature synthesis and excellent air and humidity stability further enhanced the potential of Sb-doped Cs2ZrCl6 for application.
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MATERIALS LETTERS
·
2021
·
IF 3.423
Min Li,Rui Zhao,Sude Ma
To mitigate clogging during industrial wastewater piping, a low surface energy composite was prepared by incorporating Silicon-containing acrylate polymer (SAP) and hydrophobically modified SiO 2 nanoparticles into High-density polyethylene (HDPE) matrix. The morphological structure, thermal behavior, and anti-fouling performance of the composite were studied. The results showed that the prepared composite has both good thermal stability and compatibility. The acrylate polymer and nanoparticles in the composite not only enhance its hydrophobicity but also decrease the associated surface energy, which may reduce pipe clogging potentials. Besides, the anti-fouling performance of the prepared composite is superior to that of the typical commercial pipe materials, e.g., Polyvinyl chloride (PVC), Polypropylene random (PPR), and Acrylonitrile butadiene styrene (ABS), indicated by a dispensing industrial wastewater immersion experiment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Ying Liao,Yu Chen,Caiyan Wan,Guangxian Zhang,Fengxiu Zhang
A halogen-free, formaldehyde-free, efficient, durable, N P flame retardant, the ammonium salt of meglumine phosphoric ester acid (ASMPEA), was prepared. The Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy ( 1 H NMR, 13 C NMR, and 31 P NMR) results indicated that ASMPEA was grafted onto cotton fibers by P-O-C covalent bonds. The LOI value of 30 wt% ASMPEA-treated cotton fabric was 40.2%, and after 50 laundering cycles (LCs), the LOI value decreased to 29.4%, indicating that the cotton fibers treated with ASMPEA were endowed with excellent durable flame retardancy. Thermogravimetry (TG), cone calorimetry, and vertical flammability test results showed that ASMPEA-treated cotton decomposed into phosphoric acid or polyphosphoric acid during combustion, which promoted the thermal degradation and charring of treated cotton fabrics and hindered the spread of flames. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive spectrometry (EDS) verified that ASMPEA infiltrated the cotton fiber without obviously affecting its surface morphology or crystal structure; however, the mechanical properties of the treated cotton fabric decreased slightly. These results confirm that ASMPEA achieved excellent durable flame retardancy when used to coat cotton fabric.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 14
·19424-19433
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IF 2.478
Guo Chengbin,Hu Rong,Qiao Hui,Duan Chenguang,Qi Xiang
Titanium dioxide (TiO 2 ) has been widely studied in the field of photocatalysis. However, the development of TiO 2 was limited by the photoresponse only in the ultraviolet region and the rapid recombination of photogenerated electron–hole pairs. In this work, we prepare a novel TiO 2 and two-dimensional (2D) bismuth selenide (Bi 2 Se 3 ) hybrid nanosheets (TiO 2 /Bi 2 Se 3 HNs) via a simple water bath ultrasonic route. X-ray diffraction pattern and Raman spectra were carried out to confirm that as-prepared samples were pure and well crystalized. Besides, TEM characterization proves that 2D Bi 2 Se 3 nanosheets have high specific surface area and it can be clearly observed that the TiO 2 with 60 nm particles are uniformly supported on the surface. Furthermore, photoelectrochemical (PEC) measurements demonstrate that the TiO 2 /Bi 2 Se 3 HNs exhibit excellent photocatalytic performance of 4.3 µA/cm 2 under 100 W of visible light, which were almost 2.5 times that of pure TiO 2 . More importantly, our results show that the photocurrent density was quite stable and only dropped by 10% after 125 cycles. In summary, the improved photocatalytic activity is due to the unique characteristic of 2D Bi 2 Se 3 nanosheets, such as maximized reaction sites and good electrical conductivity, and the positive coupling effect of the TiO 2 /Bi 2 Se 3 heterojunction. These extraordinary properties make the TiO 2 /Bi 2 Se 3 HNs photocatalysts have excellent potential for photocatalytic application.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1292-1301
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IF 5.693
Zhang Pengxiang,Zhang Xihua,Li Bin,Xu Lingan,Dang Feng,Li Bao-Wen
Improving the interfacial impedance matching and attenuation ability of a microwave absorber is an important strategy to obtain excellent microwave absorbing performance. Here, we prepared an ultralight, hierarchical porous single-atom Co–N–C microwave absorber, in which evenly distributed single-atom Co is anchored in a porous N-doped carbon framework by N–Co bond via a facile bio-inspired method. These doped single atoms provide abundant highly active atomic absorption sites on the carbon skeleton, and considerable defects including pyridinic-N, pyrrolic-N, oxidized N, and so forth are introduced into the carbon framework owing to single Co atom doping. These doped single Co atoms and introduced defects act together as strong dipolar/interfacial polarization units, which lead to better impedance matching and a significant increase in attenuation capability of the absorber. The metal Co exists in form of a single atom, benefiting light weight of the absorber. Therefore, an extremely strong reflection loss (RL) value of − 60.9 dB is achieved at a lower filler content of 10 wt% with the absorber thickness of 2.5 mm, and the effective frequency bandwidth covered from 10.4 to 15.1 GHz with a thickness of 2.0 mm at a low filler content of 10 wt%. This research offers a novel route for designing a microwave absorber to improve microwave absorption performance and is expected to a wider range of absorbing materials with different structures. Graphical abstract
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 44
·20818-20824
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IF 3.591
Xilin Bai
Herein an injectable self-healing hydrogel via dynamic linkage of an imine bond based on a novel multi-aldehyde polyethylene glycol crosslinker was reported. The biocompatible crosslinker could be synthesized via easy chemistry on a large scale. After cross-linking with glycol chitosan, the self-healing hydrogel could be easily obtained in ∼1 h under mild conditions. The prepared hydrogel showed satisfactory mechanical properties and ideal biocompatibility and was successfully used in an in vivo mouse model as a drug carrier just like a “Trojan Horse”. It could deliver a highly concentrated anti-tumor drug (DOX) to the desired position for sustainable controlled release at a safe level. Compared with intravenous or intratumoral injection, the hydrogel drug carrier achieves an admirable therapeutic effect and collectively prevents the recurrence of colon cancer during the whole treatment process. Due to its excellent biocompatibility and good operability, this injectable self-healing hydrogel might be a promising drug carrier for surgical adjuvant treatment and other medical applications. This strategy may provide more insights for the design, study and application of new biomaterials.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Wenzhi Zhang,Tian Jiang,Xiuxiu Sun,Ani Zhou,Maoguo Li
Peracetic acid (PAA) is commonly used as the strong oxidant in many areas. However, high concentration of PAA can be harmful to health of people. The quantitative determination of PAA is of great significance. Here, a metal–organic framework (MOF) is introduced into the electrochemical sensor for PAA detection. The influence of common transition metal centers on the performance of electrochemical detection of PAA was investigated and the results showed the Cu-1,3,5-trimesic acid (Cu-BTC) was the best original MOF. Ag nanoparticles were decorated in the Cu-BTC to further improve the electrocatalytical activity. The concentration of the added Ag salt and the quality of the reducing agent tannic acid (TA) had a great impact on the performance. The final sample optimized for the synthesis conditions was named as Ag NPs/Cu-BTC. The electrochemical sensor based on Ag NPs/Cu-BTC/GCE was fabricated for sensing PAA with a wide linear range (0.1–5000 μM), low detection limit (0.046 μM, S/N = 3) and high sensitivity (1013.4 μA mM −1 cm −2 ). The water stability of Ag NPs/Cu-BTC and the anti-interference ability of the sensor were good. The electrochemical sensor could be applied in detecting the concentration of PAA in the commercially available peracetic acid, suggesting the practical application value.
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CARBON
·
2021
·
IF 9.594
Yiou Ma,Haiyun Fan,Chao Wu,Mingdao Zhang,Jianghua Yu,Li Song,Kuiran Li,Jianping He
Single-atom catalysts have been extensively studied due to the high atom utilization efficiency. However, the atomically dispersed dual-metal-site material for bifunctional catalysis in zinc-air battery is still rare. Herein, taking advantage of the trapping ability of graphene oxide to anchor metal ions, a dual-metal-site bifunctional catalyst with atomically dispersed FeN 4 and NiN 4 in the nitrogen doped graphene (Fe/Ni(1:3)-NG) is developed. Benefiting from the synergy effect between Fe and Ni, the catalytic performance can be greatly enhanced. The resultant catalyst exhibits highly efficient bifunctional catalytic activity , with the half-wave potential of 0.842 V for oxygen reduction reaction (ORR) and an overpotential of 480 mV at the current of 10 mA cm -2 for oxygen evolution reaction (OER). On the basis of bifunctional catalytic activities, the Fe/Ni(1:3)-NG based zinc-air battery shows an excellent power density (164.1 mW cm -2 ), outstanding specific capacity (824.3 mAh g -1 ) along with the prominent durability.
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Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 41
·8659-8666
·
IF 6.331
Dan Fang,Ting Li,Ziyu Wu,Qi Wang,Mimi Wan,Min Zhou,Chun Mao
It is of great significance to find effective thrombolytic treatments due to the harm caused by thrombosis to human health. Based on the formation mechanism and complex microenvironment of a thrombus, polydopamine nanomotors (PDANMs) modified by the peptide of Arg–Gly–Asp (RGD) and loaded with urokinase (UK) were designed and prepared. A polydopamine (PDA) substrate has a good photothermal conversion effect. Under near-infrared (NIR) light irradiation, it can not only perform photothermal therapy (PTT) on thrombus, but also provide the driving force of PDANMs. Thrombolytic drug UK was loaded in the mesoporous structure of the PDA substrate and can be released at the thrombus site for drug therapy. The modified RGD can target the thrombus site, moreover, benefiting from the guanidine group of L-arginine in the peptide chain, and RGD can interact with reactive oxygen species (ROS) in the thrombus microenvironment to produce nitric oxide (NO). NO not only propelled the movement of nanomotors, but also promoted the growth of vascular endothelial cells to repair damaged blood vessels. The experimental results show that NIR and NO can provide dual driving sources for the nanosystem to achieve continuous and deep penetration of the drug-loaded nanomotors at the thrombus site, while realizing the photothermal and drug synergistic therapy to enhance the therapeutic effect and promote the growth of vascular endothelium cells. This kind of thrombus treatment strategy based on nanomotor drug delivery systems will provide good technical support for the clinical treatment of inferior vena cava thrombus.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wanqing Li,Yuhang Li,Hongquan Fu,Guangxing Yang,Qiao Zhang,Shengzhou Chen,Feng Peng
A novel phosphorus-doped Co 9 S 8 and carbon nanosphere composite (Co 9 S 8 /P@CS) was successfully prepared by adding a certain amount of sodium hypophosphite during the thermal treatment process of preparing Co 9 S 8 . The results of XRD and XPS confirmed the incorporation of phosphorus into the lattice of Co 9 S 8 . Electrochemical tests demonstrated that Co 9 S 8 /P@CS performs a high electrocatalytic activity for oxygen evolution reaction (OER). Under the current density of 10 mA cm −2 , Co 9 S 8 /P@CS-1:2 as the best catalyst has the lowest overpotential of 233 mV and Tafel slope of 48 mV dec –1 , which is far superior to the current noble-metal catalyst IrO 2 (414 mV, 96 mV dec –1 ). A rechargeable Zn-air battery was assembled with Co 9 S 8 /P@CS-1:2 as the air-electrode catalyst. Its maximum power density reached 142.50 mW cm −2 at 0.56 V and the current density was 255.47 mA cm −2 , significantly higher than those of the battery made by Pt/C-IrO 2 catalysts. Especially, after 350 h (1050 cycles) of charge and discharge, the performance of this assembled battery did not show a significant decrease, predicting a broad application prospect. In-situ Fourier transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations were used to analyze the active sites of catalyst and catalytic mechanism, revealing the relationships between structure and the catalytic performance for OER.
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Biomicrofluidics
·
2019
·Vol. 13
·期 4
·
IF 2.531
Fang Chen,Du Dan,Li Dongning,Huang Jie,Tu Yifeng
Herein, a novel cell-based electrochemiluminescent (ECL) sensing matrix was developed for probing reactive oxygen species (ROSs) produced from mouse macrophage cells. Uniformly sized Au nanoparticles (AuNPs) with an average diameter of 16 nm were decorated on the surface of indium tin oxide (ITO) glass through the connection of hydrolyzed 3-aminopropyl trimethoxysilane (APTMS) serving as a sensor substrate. Then, the surface was covered with a poly- l -lysine thin film, where mouse macrophage cells were successfully cultured. The morphology of the electrodes obtained was characterized by scanning electron microscopy and atomic force microscopy, and their electrochemical properties were investigated by electrochemical impedance spectroscopy. A linear response was observed from the AuNPs/APTMS/ITO substrate with a sensitivity of 0.465 units per mg/l of H 2 O 2 , and a higher sensitivity of 207 units per mg/l of zymosan. Thereafter, a factor of 84 molecules of H 2 O 2 produced by a single glycogen was estimated. The results demonstrated that the ECL response of this cell-based sensor quantitatively correlated with yielded ROSs during cell oxygen metabolism under the stimulation of zymosan. This work suggests that the prepared sensing matrix is efficient for monitoring the oxygen metabolism of living cells and can be applied in biological and clinical fields to provide significant information on the regular or abnormal function of cells.
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