ENZYME AND MICROBIAL TECHNOLOGY
·
2012
·
IF 2.367
Jing-Yun Wang,Cui-Li Ma,Yong-Ming Bao,Pin-San Xu
Lipase from Burkholderia cepacia was encapsulated inside zirconia particles by biomimetic mineralization of K 2 ZrF 6 induced with protamine, a natural cationic protein. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) were employed for the characterization of the novel immobilized lipase. SEM and TEM images showed that both the zirconia particles with and without lipase have good spherical structures with average particle sizes of 150 nm. Fluorescence microscopy demonstrated that the lipase was indeed encapsulated inside the zirconia particles. The maximum immobilization capacity of the zirconia particles was 0.15 units/mg under optimum immobilization conditions. Biochemical characterization showed that the encapsulated lipase could retain most of its initial activity. Compared with free lipase, the encapsulated lipase exhibited improved thermal, pH, and recycling stabilities. After 8 weeks of storage, no substantial loss in catalytic activity was observed for the encapsulated lipase. The conversion of the kinetic resolution of ( R,S )-1-phenylethanol with vinyl acetate as acetyl donor catalyzed by zirconia-immobilized lipase reached 49.9% with higher ee s of 99.9% under the following optimal conditions: octane as solvent, 0.1 M ( R,S )-1-phenylethanol, 70 mg immobilized lipase, 180 rpm, 50 °C for 48 h. After 6 cycles (288 h), the conversion and ee s were still 43% and 85%, respectively.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 24
·13926-13935
·
IF 12.732
Changbin Sun,Jia Ding,Haozhi Wang,Jie Liu,Xiaopeng Han,Yida Deng,Cheng Zhong,Wenbin Hu
The rational design and controllable synthesis of excellent bifunctional oxygen reduction and evolution reaction (ORR/OER) electrocatalysts are of vital importance for zinc–air battery applications. Herein, we report nitrogen/sulfur-codoped carbon nanosheets (NSC) decorated with dense Co9S8/Co1−xS heterostructures (Co9S8/Co1−xS@NSC), prepared by a one-pot salt template-assisted pyrolysis procedure. The population of the Co9S8/Co1−xS heterostructure can be effectively controlled by tuning the precursor components. Salt templates constructed hierarchical porosity for the wide-open carbon nanosheets, which maximized the N functional groups to anchor highly dispersive Co9S8/Co1−xS species. Experiments and theoretical simulations revealed notable electronic interactions within Co9S8/Co1−xS interfaces, which can effectively optimize the adsorption/desorption behaviors of intermediates in ORR/OER, thus promoting the bifunctional electrocatalytic performance. The half-wave potential for the ORR of 0.86 V and the OER electrocatalytic potential of 1.52 V at 10 mA cm−2 were obtained. Benefiting from the strong coupling effect between the Co9S8/Co1−xS species and the carbon substrate, superior durability was obtained for 2000 ORR/OER cycles. The practical zinc–air battery based on the Co9S8/Co1−xS@NSC cathode manifested a high open-circuit voltage, small voltage gap and robust reversibility. Our study revealed the great potential of the bi-elemental (Co and S) heterostructure in enhancing the ORR/OER activity, which suggests a logical extension to other electrocatalysis systems.
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INORGANIC CHEMISTRY
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2020
·
IF 4.825
Ailijiang Abudurusuli,Junjie Li,Tinghao Tong,Zhihua Yang,Shilie Pan
The exploration of novel infrared nonlinear optical (IR NLO) materials with large second-harmonic generation (SHG) responses and wide band gaps has become very imperative recently. Herein we reported two noncentrosymmetric compounds, LiBa4Ga5Q12 (Q = S, Se), crystallizing in space group P421c (No. 114), which feature 3D frameworks built by a basic [Ga5Q16]17– windmill cluster and LiQ4 tetrahedra in a cesium chloride topological structure. Both compounds satisfy the desired balance between good SHG responses (∼1.5× that of AgGaS2) and wide band gaps (3.43 and 2.44 eV) with remarkable laser damage thresholds (21× and 6× that of AgGaS2). The theoretical calculations uncover that the [Ga5Q16]17– cluster makes major contributions to the SHG effect in LiBa4Ga5Q12. In addition, the structure–performance relationship among all compounds in the I–II4–III5–VI12 system has been discussed systematically, which indicates that the introduction of the alkali metal lithium in the I site is beneficial for the production of large band gaps. This work will be helpful in exploring novel IR NLO materials with special structures and comprehensive properties in the chalcogenide system.
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高影响因子
Polymers
·
2019
·Vol. 11
·期 3
·546
·
IF 3.164
Yanbin Wang,Huang Yu,Yongchao Li,Teng Wang,Tao Xu,Jinxing Chen,Zicheng Fan,Yufeng Wang,Biaobing Wang
Highly conductive thin films with suitable mechanical performances play a significant role in modern electronic industry. Herein, a series of ternary conductive polymer composites were fabricated by incorporating carbon black (CB) into binary conductive polymer composites of poly(amide-imide) (PAI) and polyaniline (PANI) to enhance their mechanical and conductive properties simultaneously. By varying the composition of PAI/PANI/CB ternary films, the conductivity enhanced by two orders of magnitude compared with the sum of PAI/PANI and PAI/CB binary conductive polymer composites, and a high conductivity of 1160 S m−1was achieved. The improved conductivity is mainly because much more continuous conductive networks were constructed in the ternary conductive polymer composites. With the help of the unusual morphology, the tensile strength was also enhanced by more than 80% from 21 to 38 MPa. The origin for the improved morphology was discussed for further improvement.Keywords:conductive polymer composite;ternary blend;poly(amide-imide);polyaniline;carbon black
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 34
·e202200543
·
IF 5.02
Zhuoran Ao,Youlan Zou,Haiyan Zou,Yuxing Huang,Nantao Chen
Graphical PEO-based Double-layer solid electrolyte was fabricated through casting method. PVP distributed into PEO layer contacting with cathode promotes the dissolution of lithium salts and forms lithium bonds with (LiPSs). The double-layer solid electrolytes can ameliorate the shuttle effect of LiPSs better than pure PEO electrolytes. Despite the high specific capacity of Li−S battery, shuttle effect of lithium polysulfides (LiPSs) and safety issue pose a great challenge to realize its commercial application. Replacing liquid electrolyte with poly (ethylene oxide) (PEO) -based solid-state electrolyte is considered as a promising method to boost the safety, but the shuttle effect of LiPSs cannot be completely eliminated. In this work, a new kind of double-layer PEO-based polymer electrolyte is designed to restrict the LiPSs. The layer next to cathode consists of PEO and poly(vinylpyrrolidone) (PVP). The other layer consists of PEO. PVP with abundant of amide groups has been proved to have strong affinity to LiPSs. The strong interaction between LiPSs and carbonyl groups in amide is verified by Attenuated Total Reflection-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy tests. As a result, the assembled Li−S battery exhibits a specific capacity of 1100 mAh g −1 and capacity retention of 347 mAh g −1 after 200 cycles at 60 °C and 0.05 C, while the capacity retention of the battery without PVP-blended PEO electrolyte remains only 27 % at the same conditions.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 10
·1-14
·
IF 2.127
Hua Jisong,Teng Peng,Zou Yingying,Zhang Chao,Shen Xujie,Cai Jianfeng,Hu Yong
The bacterial infections, especially wound infection, have become a growing problem threatening the human health. Small molecular antimicrobial agents were synthesized to fight against the bacteria but the clinical application in wound inflection treatment was restricted because of their hydrophobicity and poor skin permeation. Here, we synthesized a novel quinoline compound to be used as an antimicrobial agent. Due to its hydrophobic property, this quinoline compound could be successfully encapsulated into poly(epsilon-caprolactone)-poly(ethylene glycol) (PCL-PEG) nanoparticles (NPs) with a mean size of about 100 nm and showed a sustained drug release manner in vitro. Compared to the free drug of this quinoline compound, these drug-loaded PCL-PEG NPs had better water solubility and lower cytotoxicity in vitro. Results of in vivo wound healing experiments demonstrated that these drug-loaded NPs could not only greatly suppress the bacterial infection around the wound, but also significantly accelerate the curing rate of wound. Thus, these quinoline compound-loaded PCL-PEG NPs could act as a promising drug delivery system for wound healing applications.
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 44
·7042-7051
·
IF 5.047
Lianjing Zhao,Zepei Wu,Guannan Liu,Huiying Lu,Yuan Gao,Fangmeng Liu,Chenguang Wang,Jiuwei Cui,Geyu Lu
Nanozymes have drawn considerable attention because of their lower cost, higher stability and convenient preparation compared to protein enzymes. In the present work, Mo, S co-doped carbon quantum dots (Mo-CQDs) as a peroxidase mimic were used to fabricate a cascade colorimetric biosensor to detect cholesterol. The Mo-CQDs possess a robust peroxidase-like activity, and they can easily catalyze 3,3,5,5-tetramethylbenzidine (TMB) to produce an oxidized TMB in the presence of H2O2. The Mo, S doping in the carbon quantum dots (CQDs) notably boosts the yield of CQDs and may facilitate the electron transfer between TMB and H2O2, which further enhances the catalytic activity of CQDs. The colorimetric biosensor based on Mo-CQDs and cholesterol oxidase exhibited excellent selectivity and high sensitivity for cholesterol in the range of 0.01–1.0 mM along with a detection limit as low as 7 μM. The total cholesterol concentration in the serum sample was measured with satisfactory results and read out by the naked eye, indicating the potential application in clinical diagnosis and portable test kits.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Pengfei Wan,Siyang Dong,Jing Xiong,Xuanyang Jin,Shengjun Lu,Yufei Zhang,Haosen Fan
Lithium sulfur batteries (LSBs) have been considered as one of the most promising options for next generation high-performance batteries. However, the heavy shuttle effect and inferior redox conversion during the charge/discharge processes of the batteries have greatly hindered their further applications. In this study, to address these disadvantages of LSBs, Fe/Fe 3 C/FeN 0.0324 heterostructured nanocubes were designed and prepared through high temperature carbonization process using Prussian blue precursor. Then the Fe/Fe 3 C/FeN 0.0324 nanocubes were used to modify the commercial polypropylene (PP) separator, which can greatly catalyze the redox transformation of polysulfides and provide sufficient active sites for chemisorption . As result, the modified separator endowed LSBs with excellent rate capacity and cycle stability, delivering a high-capacity of 1025 mAh/g at 0.5 C with nearly 100% coulombic efficiency. It also displayed a superb cycling performance with a per-cycle capacity attenuation rate of 0.09% after 300 cycles. When the current density increased to 1 C with the S loading of 1.73 mg cm −2 , Fe/Fe 3 C/FeN 0.0324 -PP separator presented a satisfactory capacity decay rate of 0.05% per cycle after 1000 cycles. Besides, it also presented outstanding electrochemical performance even at high sulfur loading of 4.5 mg cm −2 . This work has provided a new avenue for the design of nanomaterials with synergistic effect of catalytic conversion and chemisorption of polysulfides for the promotion of high-performance Li-S batteries.
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CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Jinjun Peng,Jun Shen,Xiaohui Yu,Hua Tang,Zulfiqar,Qinqin Liu
Plasmonic nonmetal semiconductors with localized surface plasmon resonance (LSPR) effects possess extended light-response ranges and can act as highly efficient H 2 generation photocatalysts. Herein, an LSPR-enhanced 0D/2D CdS/MoO 3− x heterojunction has been synthesized by the growth of 0D CdS nanoparticles on 2D plasmonic MoO 3− x elliptical nanosheets via a simple coprecipitation method. Taking advantage of the LSPR effect of the MoO 3− x elliptical nanosheets, the light absorption of the CdS/MoO 3− x heterojunction was extended from 600 nm to the near-infrared region (1400 nm). Furthermore, the introduction of 2D plasmonic MoO 3− x elliptical nanosheets not only provided a platform for the growth of CdS nanoparticles, but also contributed to the construction of an LSPR-enhanced S-scheme structure due to the interface between the MoO 3− x and CdS, accelerating the separation of light-induced electrons and holes. Therefore, the CdS/MoO 3− x heterojunction exhibited higher photocatalytic H 2 generation activity than pristine CdS under visible light irradiation, including under 420, 450, 550, and 650 nm monochromic light, as well as improved photo-corrosion performance.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 21
·7200-7216
·
IF 6.119
Hairus Abdullah,Hardy Shuwanto,Dong-Hau Kuo
A Ni–Mg bimetal-doped Zn(O,S) photocatalyst has been synthesized, characterized, and tested for several photocatalytic applications. The hydrogen generation reaction, hydrogenation reaction for chemical transformation, detoxification of hexavalent chromium, and mixed dye (MB + RhB + MO) degradation under simulated solar-light illumination were confirmed. The essential characterization results indicated improved oxygen vacancy sites on the catalyst with enhanced photoresponse, better photocarrier separation, and facile charge transfer properties. A typical catalyst, NMZ-S10, was evaluated with a 1000-cycle CV test to demonstrate its long-term use for industrial application. Stable reusability experiments for the HER, PHR, PHC reaction, and PDM also supported the long-term application. The photocatalytic HER of NMZ-S10 could evolve hydrogen at a rate of 4000 μmol g−1 h−1. 30 ppm azobenzene-to-aniline conversion was completely done in 2 h of reaction. Detoxification of 30 ppm hexavalent chromium was conducted in 70 min of reaction. Finally, 10.5 ppm MB–RhB–MO mixed dye degradation was carried out in 1 h of reaction. The as-synthesized NMZ-S10 catalyst has demonstrated its capability to overcome energy and environmental issues promisingly. The great photocatalytic activities are discussed and elucidated with a plausible mechanism to rationalize the superb catalytic performance.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xin Tao,Jingyu Ren,Danjun Wang,Hua Huang,Yani Li,Di Guo,Baoqin Shan,Yu Liu,Jian Wang,Yanzhong Zhen,Zhirui Niu
The low activity of photocatalysts is mainly due to inefficient charge separation and low production of the active species. To overcome this challenge, we constructed an S-scheme CdIn 2 S 4 /MnZnFe 2 O 4 (CIS/MZFO) heterostructure, where the strong interface of the heterostructure leads to an upshift of the d-band center. CIS/MZFO shows higher charge transfer efficiency and oxygen adsorption/activation performance compared to CIS and MZFO separately, thereby increasing the production of ·O 2 − and h + active species. As a result, it demonstrats efficient photocatalytic degradation of tetracycline hydrochloride. The optimized CIS/MZFO heterostructure also shows good tolerance to various factors, such as inorganic ions, organic acids, pH and real water environments. The heterostructure also exhibits excellent magnetic recyclability and stability. Additionally, we propose a photocatalytic degradation pathway for tetracycline hydrochloride and evaluate the ecological toxicity that may arise from intermediates. This study provides an effective approach for the design of advanced photocatalysts.
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ENERGY & FUELS
·
2020
·
IF 3.421
Cheng Yang,Chengyong Shu,Zhuofan Gan,Chen Lai,Jijun Ma,Wei Tang,Yuping Wu
ZIF-8-derived Fe–N–S triple doping hollow-shell nanoparticles are prepared by the surface modification of SCN– ligands. Fe3+ ions are highly adsorbed on the SCN–-modified layer, forming a hollow-shell rhombic dodecahedron particle after pyrolysis. Doping extra S atom is found to be an effective method to increase the density of atomically dispersed active sites and boost their catalytic performance. The H-ZIF-Fe-SCN catalyst shows good bifunctional stability toward the oxygen reduction reaction and the oxygen evolution reaction in alkaline solution, the half-wave potential for the H-ZIF-Fe-SCN catalyst was recorded to be 0.889 V vs reverse hydrogen electrode, and a maximum power performance of 158.8 mW cm–2 was achieved when it was used as a cathode catalyst in zinc–air batteries.
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