ACS Applied Nano Materials
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2024
·
IF 5.3
Yaohua Gu,Jiping Han,Ni Zhang,Weisong Yan,Yue Guo,Huiyi Tan,Changyi Yang,Fuke Wang,Huiqin Yao
Nanozyme possess the advantages of high enzyme simulation activity, low cost, and excellent stability. As a substitute for natural enzymes, nanozyme have demonstrated significant potential in various fields. In this study, a bimetallic organometallic framework Cu@Co-MOFs was synthesized via the hydrothermal method using terephthalic acid (H2BDC) as a ligand and characterized. Cu@Co-MOFs exhibits outstanding peroxidase activity (POD) by catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) and other color-developing substrates through •OH formation. A simple, rapid, and reliable colorimetric method for quantitatively detecting glutathione (GSH) was developed based on the Pod-like activity of Cu@Co-MOFs. The linear range of this method was 1–1200 μM with a detection limit of 0.72 μM. This work not only proposes a bimetallic organic framework with high POD as a straightforward and practical platform for visually detecting GSH but also provides a strategy to enhance the performance of nanomaterials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Guangcai Ma,Wenbin Li,Fei Wang,Lunyong Zhang,Bin Chen,Xiujun Yu,Wenqing Hu,Ting Ding,Baiyang Zhou,Zhuo Zhang
As an intriguing strategy for massive hydrogen production, photoelectrochemical (PEC) seawater splitting compels the anode to be highly hypochlorite-resistant. Inspired by algae, we designed a robust photoelectrocatalyst that WO 3 nanorods (NRs) are covered by N/W co-doped (Co, Ni, W)O x N y nanosheets (NSs). The NSs expose (111) faces and are decorated by (Co, Ni)WO 4 nanoparticles. DFT calculations reveal that Co and Ni atoms on the (111) surface of N/W co-doped NSs are more likely to adsorb OH - , while W atoms are more favorable to adsorb Cl - . Secondly, the lattice distortion and multi-crystal phases of NSs are triggered by doped W atoms, and the evacuation of 5d electrons makes W atoms as donor centers, leading to enhanced catalytic activity of CoNi atoms and corrosion resistance to Cl - . Furthermore, the N atoms expand the valence band of CoNiO x and elevate the conduction band of (Co, Ni)WO 4 , facilitating more electrons to participate in PEC reaction and the realization of seawater full-splitting. Resultantly, the N/W co-doped (Co, Ni, W)O x N y /WO 3 hetero-NRs (HNRs) demonstrate a PEC current density about 0.35 mA/cm 2 at 1.23 V RHE with durability over 100 hours in seawater. This work provides a practical strategy towards the durable PEC anode for seawater splitting.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2024
·Vol. 107
·期 5
·3577-3586
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IF 3.5
Peng Wei,Shixin Zhao,Lei Zhuang,Hulei Yu,Yexia Qin,Yanhui Chu
The synthesis of high-quality nanopowders is crucial to developing high-performance, high-entropy rare-earth silicates (HERESs). Herein, we report the synthesis of HERES nanopowders, including high-entropy rare-earth monosilicates (HEREMs) and high-entropy rare-earth disilicates (HEREDs), via a simple chemical co-precipitation method for the first time. By rationally optimizing the synthesis conditions, monoclinic HEREM nanopowders can be well synthesized with highly uniform element distributions. The formation of HEREM nanoparticles is governed by the production of the precursor from the co-precipitation reactions between rare-earth hydroxide and silicic acid at the atomic scale, followed by the dehydration of precursor skeletons. Furthermore, the validation of using this approach to prepare HERED nanopowders is also confirmed. This research will open up a new research area in synthesizing HERES nanopowders.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zhaoqian Zhang,Hongxia An,Qiaoxia Hu,Junping Miao,Genghao Gong,Yunxia Hu
Dopamine-assisted co-deposition is a promising approach for preparing nanofiltration (NF) membranes due to its simplicity, controllability, and versatility. However, limited research has been conducted on the functionalization and membrane formation mechanism of polydopamine (PDA) co-deposition membranes. In this study, lysozyme (Lys) was selected as one model protein and co-deposited with dopamine to prepare antibacterial NF membranes. The effects of the mass ratio of PDA/Lys and deposition time on the selective layer structure and membrane performance, and membrane-forming mechanism were systematically investigated. Results prove that addition of lysozyme into a dopamine solution promotes the rapid formation of a dense selective layer, and the maximum density of the PDA/Lys co-deposition layer reaches 1.53 g·cm −3 with the optimal 1:0.50 mass ratio of dopamine and lysozyme, and the resulting membranes have the effective pore size of 1.5 nm in diameter. The optimal PDA/Lys membranes can achieve high methyl blue (MB) rejection (98.2 %) and low salt rejection (13.1 % for NaCl) while maintaining high water permeance (42.4 L·m −2 ·h −1 ·bar −1 ) and demonstrating excellent long-term operational stability. Moreover, the NF membranes made from co-deposition of PDA and Lys exhibited outstanding antibacterial properties with 92 % bacterial-killing efficiency. Our work provides a simple method for utilizing functional proteins to prepare antibacterial NF membranes, and offers new insights into the membrane-forming mechanism of dopamine-assisted co-deposition membranes.
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高影响因子
POLYMER COMPOSITES
·
2024
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IF 4.8
Zhou Xu,Xiuying Qiao,Kang Sun,Yujie Chen,Hezhou Liu
Great environmental and economic benefits can be achieved by utilizing the agricultural residue corn stover (CS) to prepare the biodegradable poly(butylene adipate-co-terephthalate) (PBAT) composites. However, CS contains polarized hydroxyl groups from its main component cellulose, thus leading to its poor wetting by hydrophobic PBAT. It is of great significance to promote the compatibility between CS and PBAT for the improvement of interfacial interactions and composite performance, but the compatibilizer modified CS/PBAT biocomposites have been rarely mentioned until now. In this study, polyethylene glycol (PEG), glycidyl methacylate (GMA), and ethylene vinyl alcohol copolymer (EVOH) were chosen to investigate the compatibilizer effect on the morphology, microstructure, thermal properties, mechanical strength, and water absorption capacity of the biodegradable CS/PBAT composites. The results reveal that the incorporated compatibilizers obviously improve the interface adhesion between CS and PBAT by reducing the hydrophilicity of CS surface. The enhanced interfacial bonding interactions effectively promote the crystallinity and mechanical strength of the CS/PBAT composites, but the initial degradation temperature and hydrophilicity of compatibilizers themselves also remarkably influence the composites’ thermostability and water absorption. Highlights The agricultural residue corn stover (CS) was used to reinforce PBAT. Effects of three different compatibilizers on the composites were studied. Compatibilizer improves the interface adhesion between CS and PBAT. Compatibilizer promotes crystallinity and mechanical strength of composites. The stability and hydrophilicity of compatibilizer affect those of composite.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Qizhou Dai,Jiazhong Zhou,Mili Weng,Xubiao Luo,Daolun Feng,Jianmeng Chen
This study presents an electrochemical method for the degradation of metronidazole (MNZ) in aqueous solution with novel PbO 2 electrode, which was prepared via electrodeposition in nitrate solution. The influencing factors on electrochemical decomposition of pollutants were evaluated and the removal of MNZ and chemical oxygen demand (COD) reached 78.09% and 21.77% after 120 min treatment under the optimal conditions with the concentration of supporting electrolyte, the initial concentration of MNZ, the pH and the current density were 0.10 mol/L, 100 mg/L, 6.4 and 10 mA/cm 2 , respectively. Then, the Co doped PbO 2 electrodes were prepared and used to degrade MNZ under the optimal conditions. Relatively good performance was achieved when the molar ratio of Pb and Co was 100:1. Compared to pure PbO 2 electrode, the steady-state polarization curves and cyclic voltammetry analysis showed that 1.0% Co-PbO 2 electrode had a higher oxygen evolution potential and greater current of reduction and oxidation peaks, which increased the electrochemical activity and decreased the energy consumption. Finally, based on the intermediate products identified by IC and GC/MS, the main degradation pathway of MNZ was proposed including ring open, denitrification and radical reactions.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Tara Larsson,Ting Shuai Li,Min Xu,Ida Fransson,Guangsen Yu,Martin Andersson,Baihai Li,Bengt Sunden
In this study, we co-fabricated the Ni-based nanofibers using an electrospinning technique. The effects of viscosity, applied voltage and distance from needle to the collection plate on the fiber morphology were investigated. The fibers were sintered at temperatures ranging from 350 °C to 1200 °C and the results indicated that the crystallization was completed at 800 °C and the particle size increased with the temperature. The porosity of nanostructure can reach over 50% before reduction of the nickel oxide, which increased firstly with the temperature and then decreased over 800 °C. The nanocrystallization of an anode was helpful to maximize the electrochemical reaction sites for restraining the activation polarization and also to enlarge pores for rapid gas diffusion in fuel cells.
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高影响因子
POLYMER
·
2016
·
IF 3.586
Hongyan Yao,Kaixiang Shi,Ningning Song,Na Zhang,Pengfei Huo,Shiyang Zhu,Yunhe Zhang,Shaowei Guan
A novel diamine monomer 3,3′-Bis(2,3,5,6-tetrafluoro-4-vinylphenoxy)biphenyl-4,4′-diamine (TFVBPA) bearing double hydrophobic cross-linkable tetrafluorostyrol side-groups has been successfully synthesized via a nucleophilic substitution reaction . A series of cross-linked highly sulfonated co-polyimide (CSPIy-TFVBPAx) membranes with ion-exchange capacity (IEC) values ranging from 2.27 to 2.44 meq. g −1 have been prepared from this monomer . The CSPIy-TFVBPAx membranes show excellent comprehensive properties, especially the high proton conductivity (0.135–0.190 S cm −1 at 80 °C), low water uptake (60.9–76.7% at 80 °C) and swelling ratio (14.2–19.6% at 80 °C). Moreover, the CSPIy-TFVBPAx membranes also exhibit outstanding thermal stability (5% weight loss temperature exceed 320 °C) and excellent hydrolytic stability. The results indicate that the CSPIy-TFVBPAx membranes are promising candidates for proton exchange membranes in fuel cell applications .
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 6
·5231-5237
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IF 3.277
Zhangping Xu,Wenjing Wang,Jingchuan Wu,Sai Mi,Jianming Zheng,Chunye Xu
A pair of solution-processable electrochromic polymers poly(2,3-bis(3,4-bis(dodecyloxy)phenyl)-5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)quinoxaline) (P1) and poly(3,4-di(2-ethylhexyloxy)thiophene-co-3,4-dibutoxythiophene) (P2) were designed and synthesised through a chemical oxidative polymerization and copolymerization approach. According to colour mixing theory, the two polymers with complementary colours (green for P1 and purple-red for P2) were utilised to create black-to-transmissive switching films via co-processing from a solution containing them in an appropriate mass ratio. The films exhibit a deep black colour, moderate optical contrast and robust stability. This method and the films with favourable electrochromic performances could be employed for the realization of potential large area electrochromic device applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Yitao Wu,Yinyan Gong,Jiaqi Liu,Zhen Zhang,Yan Xu,Hui Ren,Can Li,Lengyuan Niu
B and Y doped titanium dioxides (TiO 2 ) photocatalysts were synthesized by a sol-gel method followed by calcination . It is observed that the photodegradation efficiency of B and Y co-doped TiO 2 is twice that of undoped sample. To explore the underlining mechanism, x-ray diffraction, Raman, scanning electron microscope, x-ray photoemission, and UV–Vis diffuse reflectance spectroscopy measurements have been carried out to investigate the effect of B and Y doping on the structural, electronic, and optical properties of titania. Experimental observations revealed that in TiO 2 lattice Y 3+ ions tend to replace Ti 4+ ions while B 3+ ions occupy the interstitial sites. The incorporation of interstitial boron dopants will create oxygen vacancies ( Ov ·· ) and reduce Ti 4+ to Ti 3+ to form [ Ov ·· -Ti 3+ ] + complex, which traps the carriers and prolongs carrier lifetime. Moreover, Y 3+ ions can trap the photo-excited electrons to form Y 2+ ions, which will then react with the absorbed O 2 on TiO 2 surface to generate reactive species. In addition, all the doped samples have smaller crystallite sizes . The formation of B interstitials and Y substitutes, and increased surface-to-volume ratio are all beneficial to improve photocatalytic activity.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2013
·Vol. 172
·期 4
·1859-1865
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IF 1.893
Li Xiaohua,Zhang Zhujun,Li Yongbo
This work presents a new chemiluminescent (CL) probe array assay. The new type CL probe array is based on enzyme mimics of Co 3 O 4 –SiO 2 mesoporous nanocomposite material, which not only have an excellent catalytic effect on the luminol–H 2 O 2 CL reaction in an alkaline medium but also can be used for the immobilization of enzymes. The linear range of the lactose concentration is 3.0 × 10 −7 to 1.0 × 10 −5 g mL −1 and the detection limit is 6.9 × 10 −8 g mL −1 . β-Galactosidase and glucose oxidase were selected as a model for enzyme assays to demonstrate the applicability of Co 3 O 4 –SiO 2 mesoporous nanocomposite material in multienzyme immobilization. The novel bifunctional CL probe array has been successfully applied to the determination of lactose in milk.
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PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2013
·
IF 2.56
Xiangbo Ji,Jianguo Deng,Bin Kang,Hui Huang,Xin Wang,Wei Jing,Tao Xu
Yttrium aluminum garnet (YAG) nano-precursors were synthesized by urea homogeneous co-precipitation. The morphology and crystalline phase, particularly the in situ evolved gases of as-synthesized precursors during the thermal decomposition, were characterized and verified. The evolved NH 3 , H 2 O, and CO 2 gases can be observed below 600 °C. The released NO 2 gas was observed at 202 °C, 500 °C and 885 °C, which suggests that N O 3 − existed in the precursor with three different forms. Furthermore, the evolved SO 2 gas was detected above 850 °C due to desulfurization. Phase-pure YAG can be obtained when the precursor was calcined at 900 °C. The particle size increases with increasing calcination temperature. The powders calcined at 1100 °C were well dispersed and had an average grain size of 100 nm owing to the decomposition of S O 4 2 − at high temperatures.
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高影响因子
危险品化学品经营许可证（带存储）