FOOD CHEMISTRY
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2022
·
IF 9.231
Jing Liu,Ninglong Zhang,Jiansen Li,Mingyang Li,Guangxian Wang,Wenli Wang,Yuxia Fan,Shui Jiang,Gaole Chen,Yin Zhang,Xia Sun,Yuan Liu
The bioelectronic tongues based on taste receptors have been emerging with human-like taste perception. However, the practical applications of the receptor-based biosensors were restricted by their narrow and low dynamic ranges. Here, a novel immobilization strategy based on [email protected] /Ti 3 C 2 MXene was developed to immobilize the umami ligand binding domain (T1R1-VFT), to fabricate an umami biosensor for umami substances detection. Through the synergic effect of [email protected] and Ti 3 C 2 MXene, the capacity to load T1R1-VFT was effectively increased, and the response signal was also amplified by approximately 3 times. The proposed biosensor showed an ultrawide dynamic range of 10 −11 –10 −3 M, and a high upper limit of detection, which was closer to the human taste threshold and suitable for detecting foods rich in umami substances. Additionally, the biosensor was successfully applied to detect real samples and analyze the synergistic effects of binary umami substances.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Xianliang Li,Yuyang Di,Zhihao Chen,Wenzhong Yang
In this study, novel pH-sensitive bimetallic Ce-ZIF-8 nanocontainers are loaded with benzotriazole (BTA) corrosion inhibitors and then decorated with a polydopamine (PDA) shell. The applied PDA layer acts as an acid-responsive gatekeeper, controlling the intelligent release of the encapsulated inhibitors and also preventing their self-leakage. UV–vis and ICP-OES tests indicate that the BTA and cerium inhibitors release slowly in the neutral 3.5 wt% NaCl solution. Afterward, the designed pH-responsive Ce-ZIF-8-BTA-PDA nanocontainers are dispersed uniformly in the epoxy matrix as a novel intelligent filler. EIS results demonstrate that the incorporation of Ce-ZIF-8-BTA-PDA nanocontainers significantly improves the corrosion resistance of epoxy coatings, in which the low-frequency impedance is about three orders of magnitude higher than that of the pure epoxy coating after 60 days of immersion. Furthermore, the low-frequency value of the scratched Epoxy-Ce-ZIF-8-BTA-PDA coating increases from 5.05 × 10 5 Ω cm 2 to 8.83 × 10 5 Ω cm 2 after 8 h of exposure to the 3.5 wt% NaCl solution, confirming their outstanding self-healing performance. The excellent corrosion protection and self-healing ability are due to the incorporation of the Ce-ZIF-8-BTA-PDA nanocontainers, improving the surface compactness and therefore enhancing the physical barrier effect. Moreover, the intelligent release of the encapsulated corrosion inhibitors provides active corrosion protection performance by forming a dense protective film on the Al alloy surface when the coating is damaged. Meanwhile, the highly dispersed nanocontainers lengthen the diffusion path of corrosive ions and therefore extend the service life of the epoxy coatings in aggressive environments. This new type of acid-responsive smart coating based on the bimetallic Ce-ZIF-8 nanocontainers has the potential to broaden the future applications of active corrosion protection of metals.
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高影响因子
Materials Today Nano
·
2022
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IF 13.364
C. Shuai,X. Yuan,Y. Shuai,G. Qian,J. Yao,W. Xu,S. Peng,W. Yang
Antibacterial property is urgently needed in scaffold-induced bone regeneration. Zinc oxide (ZnO) as a photocatalyst enables to produce photoexcited electron-hole pairs to catalyze reactive oxygen species (ROS) generation, which triggers the peroxidation and consequently apoptosis of bacteria. However, the fast recombination of electron-hole pairs and the wide band gap of ZnO restrict the full play of its antibacterial property. Herein, a nitrogen-doped carbon-ZnO (NC-ZnO) heterojunction derived from metal organic frameworks was synthesized by direct carbonization . On one hand, the N-doped C in NC-ZnO acted as electron acceptors to trap photoexcited electrons in conduction band of ZnO, which improved the separation efficiency of electron-hole pairs. On the other hand, the N-doped C with high absorption coefficient enabled NC-ZnO to possess a relatively narrow band gap and wide light absorption range compared with ZnO. The obtained NC-ZnO heterojunction was then introduced into poly- l -lactic acid (PLLA) scaffold to construct a photodynamic antibacterial platform. The results showed that NC-ZnO endowed the scaffold with excellent photocatalytic activity and greatly stimulated the production of ROS. The antibacterial tests suggested that the PLLA/NC-ZnO scaffold possessed robust antibacterial activities with 99.9% antibacterial efficiency toward Escherichia coli , which was increased by 113.9% compared with PLLA/ZnO scaffold.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 6
·2909-2917
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IF 2.047
Han Yi,Jiang Wenwu,Jiang Jing,Zhou Ji,Ding Yanhuai
ZIF-67 has been widely utilized for the preparation of Co-based catalysts, N-doped porous carbon, and a variety of energy storage nanomaterials. In this paper, ultrafine Co 9 S 8 nanoparticles derived from ZIF-67 have been employed to improve the electrochemical performance of N-doped carbon nanofibers (CNFs). The Co 9 S 8 nanoparticles embedded into the CNFs provide the composites with extra Li-storage capacity and high rate capability. An accessible discharge capacity around 762 mAh g −1 can be obtained at a current density of 0.1 A g −1 after 100 cycles. Besides, the composites exhibit better cycling performance and rate capability compared with the raw N-doped CNFs.
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高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 8
·e17707
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IF 4.167
Xiaoquan Feng,Donglai Peng,Meixia Shan,Xinpu Niu,Yatao Zhang
The ZIF-8@Agmim core-shell hybrid material was synthesized via a favorable post-modification method of ion exchange (PMIE). This infrequent ZIF-8@Agmim core-shell structure maintains a well-integrated pore size that is almost the same as ZIF-8. The similar equilibrium isotherms with ZIF-8 and better kinetic separation toward propylene/propane than ZIF-8 render ZIF-8@Agmim to be an interesting candidate for propylene/propane separation. The core-shell hybrid nanomaterial was further used as nanofillers in the polymer of intrinsic microporosity matrix (PIM-1) for propylene/propane separation. The resultant mixed-matrix membranes (MMMs) exhibited a simultaneous increase in C 3 H 6 permeability and C 3 H 6 /C 3 H 8 ideal selectivity compared to pure polymer membrane owing to a synergistic effect of molecular sieving from ZIF-8 and π -complexation of Ag + with propylene. The separation performance of the prepared MMM surpasses the upper bound line of polymer membranes. Furthermore, the hybrid materials possess superb photochemical stability and the corresponding MMMs exhibit excellent anti-aging property and long-term stability.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Li Yin,Dongfeng Li,Hongxia Guo,Shuai Wang,Tiexin Zhang,Yunling Liu,Fangyuan Gai,Xiaogang Zhao
Incorporating functional materials into polymer precursors is an effective way to prepare carbon molecular sieve (CMS) membranes for solving the trade-off problem between permeability and selectivity of gas separation. In this work, we induced ZIF-8 nanoparticles (from 5 to 20 wt%) as a doping agent to construct a series of phenolphthalein-based cardo poly (arylene ether ketone) (PEK-C) -based hybrid carbon molecular sieve (ZCMS) membranes for CO 2 /N 2 separation via an oxidation and a carbonization process with pyrolysis temperature in the range of 500–700 °C. The carbonized ligand and metal centre of ZIF-8 offered additional pores of carbon matrix, which tailored the ultramicropores of ZCMS membranes for both excellent CO 2 permeability and selectivity. By treating with the temperature of 600 °C, ZCMS-600-15 (ZCMS membrane based on 15 wt% of ZIF-8-doped PEK-C) exhibited the highest CO 2 permeability of 8902 Barrer, which was 1.8 times higher than that of CMS-600 (CMS membrane based on naked PEK-C). ZCMS-600-15 showed an ideal CO 2 /N 2 selectivity value of 42.2, which is also higher than that of other samples, indicating that the appropriate doping amount of ZIF-8 is 15 wt% and the proper carbonization temperature is 600 °C. Moreover, among all the samples, ZCMS-600-15 also showed a superior CO 2 permeability of 8285 Barrer and the highest CO 2 /N 2 selectivity of 24.08 for an equimolar mixture of CO 2 and N 2 , far exceeding the 2008 Robeson upper bound. Therefore, our results suggest that incorporating MOFs into polymer precursors to prepare hybrid carbon molecular sieve membranes by carbonization process could solving the trade-off problem between permeability and selectivity, introducing new possibilities for industrial application.
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高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 19
·7561-7570
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IF 4.569
Wenhao Liao,Xianfeng Tong,Yali Zhai,Haojiang Dai,Yingyan Fu,Min Qian,Geng Wu,Tianyun Chen,Qinghua Yang
In order to lower energy consumption it is critical to develop highly efficient and stable non-precious metal bifunctional catalysts. In this study, we found that rational design of novel nanostructures is able to increase the number of active sites, conductivity and accelerate electron transfer, thus promoting enhanced performance of the catalyst. We successfully synthesized carbon nanotubes (CNTs) containing a hollow polyhedral (CNTHPs) structure through annealing, etching and phosphating. The unique hollow shape not only provides a stable structure but also facilitates mass and charge transfer. Thus, CoP/CNTHPs can catalyze the hydrogen and oxygen evolution reactions effectively with overpotentials of 147 and 238 mV at 10 mA cm−2. Simultaneously, CoP/CNTHPs only needs a voltage of 1.54 V to attain a current density of 10 mA cm−2 in the electrocatalytic water splitting process, demonstrating its bifunctional activity. Furthermore, the electrolytic catalytic performance does not weaken significantly after 12 hours of electrolysis, demonstrating excellent stability. Overall, this research offers useful insights into rational design of high-performance non-noble metal catalysts.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1142
·
IF 5.719
Mei Wan,Congling Shi,Xiaodong Qian,Yueping Qin,Jingyun Jing,Honglei Che
In this work, a novel functionalization strategy for ZIF-67-modified layered MXene was proposed, aiming at improving the fire safety of thermoplastic polyurethanes (TPU). The ZIF-67@MXene was verified by microscopic morphology, elemental composition, functional group species and crystal structure, and then the successfully prepared ZIF-67@MXene was introduced into the TPU material. When ZIF-67@MXene content was only 0.5 wt%, the peak heat release rate, total heat release rate, peak smoke release rate, total smoke release rate, and CO yield of the TPU/ZIF-67@MXene composites were reduced by 26%, 9%, 50%, and 22%, respectively, compared with the pure TPU. The thermogravimetric tests showed that the residual char of TPU/ZIF-67@MXene composites was the most in all samples. In short, the high-quality carbon layer of TPU/ZIF-67@MXene composites acts as a physical barrier to the transfer of heat and toxic gases, greatly improving the flame retardant properties of the TPU polymer.Keywords:metal-organic framework ZIF-67;MXene;fire safety;thermoplastic polyurethanes
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3678-3687
·
IF 4.682
Bai Xiao-Han,Zhang Jun,Cheng Guo-Ting,Liu Xiao-Fei,Sun Tian-Cai,Yang Jun,Cao Zhi-Kai,Ramakrishna Seeram,Long Yun-Ze
Burns on human skin often leads to slow recovery because of continuous wound infections caused by the loss of skin protection. In this study, a seed-free soaking method is put forward to prepare PCL@ZIF-8/εPL nanofibers as a dressing for burn wounds. This ZIF-8-coated polycaprolactone (PCL) fiber exhibits increased specific surface area, significantly increasing the polypeptide loading of epsilon polylysine (εPL) from 12 to 20 wt.%. The antibacterial experiment found that ZIF-8 and εPL exhibited dual antibacterial properties, and after εPL was loaded to ZIF-8, the nanofiber demonstrated stronger antibacterial properties that can better kill the remaining tenacious bacteria. This high-efficiency bactericidal property, combined with the ability to protect wounds from common infections by bacteria in the air, would promote wound healing, shortening the healing time period from 24 to 17 days. Further tissue sections confirm that the shielding effect and dual antibacterial properties of the composite fiber membrane are the reasons behind the acceleration of the healing of burns and scalds. Shielding and antibacterial material are helpful for the treatment of burns and scalds, and it may also guide the treatment of other types of wounds.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mengxin Wang,Yijie Sun,Chao Huang,Ping Wang,Hao Cheng,Chengyou Sun,Danni Jiang,Dingxun Ling,Ke Ouyang,Chonglin Feng
The limited mass transfer of short-lived radical species is an inherent drawback of heterogeneous oxidation processes. Herein, we fabricated zeolitic imidazolate framework (ZIF)-67 loaded nanoreactors with precise pore sizes based on anodic alumina oxide (AAO) templates to achieve nanoscale spatial confinement for enhanced radicals-mediated oxidation reactions. The prepared ZIF-67@AAO membrane/peroxymonosulfate (PMS) system exhibits perfect catalytic performance with a rhodamine B (RhB) removal of 100 % within 60 s under an AAO pore size of < 20 nm. The reaction rate constant of RhB degradation by the ZIF-67@AAO <20 nm /PMS system was 2.52 and 893 times that by the ZIF-67@AAO 200–300 nm /PMS and ZIF-67/PMS system (no confinement), respectively. The ordered mesoporous structure of the ZIF-67@AAO nanoreactors provided many channels for PMS and RhB molecules to enter the confined inner space of the catalyst, leading to a significant improvement in catalytic performance under nanoconfinement. Radical quenching and electron paramagnetic resonance (EPR) results indicated that SO 4 − , ·OH, 1 O 2 , and O 2 − were generated in the ZIF-67@AAO/PMS system, and their amounts were affected by spatial confinement and achieved the maximum at a pore size of < 20 nm. Furthermore, the ZIF-67@AAO catalytic membrane exhibited attractive long-term operation stability with perfect activity and neglectable Co leaching. The results of this study provide an important reference for designing novel catalytic membranes for water decontamination.
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高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 18
·e202204645
·
IF 2.1
Yingzi Huang,Xue Ye,Xinhua Gao,Lisheng Guo,Yaqiong Wang,Wenlin Xu,Jie Li
Graphical A hollow microcage structured CoMn- x catalyst was synthesized by the template method. In which abundant CO 3+ as well as surface reactive oxygen species on the surface of the CoMn-2 catalyst enabled it to exhibit extremely high catalytic activity for CO under space velocity 36,000 mL g cat −1 h −1 , being able to completely eliminate CO at 80 °C and maintain stable catalytic activity for up to 100 h. Cost-effective and highly efficient catalyst is a promising way for the removal of CO in automotive exhaust purification. Herein, a series of novel self-assembled CoMn bimetallic catalysts with hollow microcage structure have been prepared through zeolitic imidazole framework (ZIF-67) assisted method followed by direct pyrolysis in static air. Both the Mn loading and the unique hollow microcage structure play important roles in CO low-temperature oxidation, and the highest catalytic activity is obtained for CoMn-2 catalyst, which presents T 100 (temperature of 100 % CO conversion) at 80 °C. Through a systematic series of experiments, we further demonstrate that our catalysts’ superior catalytic performance arises from small particle size, high surface active oxygen content and Co 3+ /(Co 2+ +Co 3+ ) ratio. Such configuration of catalysts will pave the way for new strategies to design noble-free high-performance catalysts for CO low-temperature oxidation.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Haizhi Zhang,Zhiping Sun,Cunhui Wu,Xinguang Qin,Gang Liu
The immobilization strategy between ZIF-8 and different enzymes has focused on in situ encapsulation and pore infiltration, while the surface attachment has been seldom reported because of less functional groups on the ZIF-8 surface. Here, a magnetic amine-functionalized ZIF-8 with hierarchical pores was designed for efficient covalent immobilization of α-amylase (α-Amy). By using Fe3O4 nanoparticles as the core and ZIF-8 as the shell, followed by Au3+–Zn2+ exchange reaction and β-mercaptoethylamine modification, the magnetic hollow ZIF-8 nanoparticle with amine groups on the surface was synthesized. With the assistance of glutaraldehyde, an α-Amy-magnetic hollow ZIF-8 composite was prepared and fully characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy element mapping analysis, and vibration sample magnetometry. Then, the catalytic activity of immobilized α-Amy was explored with a Km of 2.307 mg/mL and Vmax of 0.506 mg/mL·min, indicating excellent catalytic activity. The study about stability and reusability demonstrated that the catalytic activity of immobilized α-Amy remained above 50% after 10 times of reuse. Thus, the designed magnetic amine-functionalized ZIF-8 was verified to be a nice carrier for covalent enzyme immobilization.
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危险品化学品经营许可证（带存储）