INORGANIC CHEMISTRY
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2022
·
IF 5.436
Yuanyuan Li,Hongzheng Pu,Ying Zhou,Fengling Yin,Siwei Chen,Yurou Tang,Pengfei Jiang,Ya Wu,Zhenhua Zhang,Dingfeng Yang
Cation disorder in hydroxide-based perovskites remains relatively under-researched. In this work, novel hydroxide-based perovskite Sn1/3Na2/3Sn(OH)6 was first fabricated by a direct hydrothermal method, and its ability to photodegrade 2,4-dichlorophenol was evaluated. The synthesized photocatalyst is isostructural with MSn(OH)6 (M = Mg, Ca, Sr, Mn, Fe, Co, Ni, or Zn), where the M site is occupied by disordered Sn4+/Na+. Sn1/3Na2/3Sn(OH)6 exhibits outstanding photocatalytic activity under ultraviolet light. Specifically, 99% of 2,4-DCP is photodegraded in 40 min, with approximately 94% of its total chlorine content converted to Cl– anions. Radical trapping experiments indicated that superoxide radical anions (·O2–) play a critical role during the photocatalytic process. Finally, liquid chromatography–tandem mass spectrometry was conducted to monitor the photocatalytic intermediates. Overall, our findings demonstrate that hydroxide-based perovskites with cation disorder show promise for application in photocatalysis.
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Molecular Catalysis
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2022
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IF 5.089
Xiaoyuechuan Ma,Shishuai Shi,Qixiang Xu,Li Xu,Guoji Liu
As an important intermediate of organic chemical industry, 2-methylnaphthalene (2-MN) has the application value in the field of medicine and material research. Up to date, the existing researches are aimed at 2-methylnaphthalene saturated hydrogenation and hydrocracking for high value products such as cycloalkanes and BTXs. A series of Ni-based (20 wt.%) catalysts were prepared with different reduction temperatures for the hydrogenation of 2-methylnaphthalene to 6-methyl-1,2,3,4-tetrahydronaphthalene (6-MT) in this study. The results showed that by using NiO/Al 2 O 3 -370R, 90.8% conversion of 2-MN and 59.7% yield of desired product (6-MT) can be achieved with optimum reaction conditions of 4 MPa & 340°C, 8 h. Multiple studies including catalyst characterizations, reaction kinetics and density functional theory (DFT) calculation indicates that symbiotic effect of heterostructured Ni-NiO over γ-Al 2 O 3 mainly corresponding to the desired catalytic performance. This study gains fundamental understanding in the effects of valence of Ni-based catalysts in catalytic hydrogenation.
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JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 8
·1475-1485
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IF 2.909
Xu Jiaopeng,Chen Yingbo,Cao Ming,Wang Chuanfeng,Guo Pengfei
Solar steam generation (SSG) system greatly improves the efficiency of water evaporation through heat localization, which has broad application prospects at seawater desalination and wastewater treatment. In this paper, polyamide 6-graphene oxide (PA6-GO) membrane was fabricated by nonsolvent-induced phase separation of a solution with GO-modified PA6 in formic acid. Furthermore, the PA6-GO membrane was modified by vacuum filtration of self-assembly gold nanoparticles on its surface for solar stem generation. The composite membrane obtained a light absorption rate of nearly 99.8%. Under the irradiation of 1 kW m −2 , the evaporation rate of 1.1 kg m −2 h −1 was obtained and the evaporation efficiency also reached to 75.6%. The evaporation system has the characteristics of low cost, high stability, strong acid, and alkali corrosion resistance, suggesting great potentials in seawater desalination and sewage treatment. Graphical abstract
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POLYMER BULLETIN
·
2022
·Vol. 80
·期 3
·3085-3101
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IF 2.843
Yi Zhuwu,Liu Yuejun,Liu Xiaochao,Fan Shuhong,Yang Jian,Mao Long,Lin Xintu,Peng Simei,zheng Wei
Polyamide 6 (PA6) and PA6/ethylene vinyl alcohol copolymer (EVOH) films were prepared through extrusion casting process, followed by uniaxial and biaxial stretching on a laboratory biaxial stretcher. The crystallization properties, mechanical properties, and barrier properties of PA6/EVOH films before/after stretching were investigated. It is found that the crystallinity of the stretched PA6/EVOH film is increased with the increase in EVOH content and stretching ratio. Notably, the oxygen barrier property of biaxially stretched PA6/EVOH films is 3 times higher than that of neat PA6 due to the strong interaction of two polymers and increased crystallinity. The modulus, tensile strength, and elongation at break of biaxially stretched PA6 films are also enhanced with the incorporation of EVOH. The crystal orientation of stretched PA6/EVOH films was investigated according to the wide-angle X-ray scattering analysis. The degree of orientation is increased with the stretching ratio. With the increase in the orientation degree, the stretched films show increased tensile strength whereas decreased toughness. Furthermore, the biaxially stretched films present balanced mechanical properties, and the stretching ratio of 3 × 3 shows excellent comprehensive mechanical properties.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yuxuan Qin,Chen Hang,Liping Huang,Haiyun Cheng,Junqing Hu,Wenyao Li,Jianghong Wu
In this study, Sn@C composite was fabricated from ZnSn(OH) 6 through a green thermal calcination method. For the first time, this composite was used as a modifier on glassy carbon electrode (GCE) to construct an electrochemical biosensor to detect acetaminophen (AC). The Sn@C sensor exhibited distinctly enhanced performance in electrochemical response to AC compared with bare GCE, GCE modified with Sn and GCE modified with graphene. The linear range is 0.2–100 μM and the limit of detection (LOD) is 0.020 μM based on DPV analysis. The excellent electrochemical behavior can be ascribed to the outstanding conductivity of metal Sn and carbon, and the strong adsorption of the carbon layer to AC. Most importantly, the chemical interaction between Sn and C through Sn-C bond facilitated the electron transfer process in the electrooxidation of AC. Finally, the Sn@C sensor was successfully applied in pharmaceutical samples and spiked serum samples to detect AC with satisfactory recoveries.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yang Haoyu,Zhang Xiaoqi,Liu Yiming,Mao Lu,He Suqin,Huang Miaoming,Liu Hao,Xu Wanlin,Liu Wentao
In this study, nylon 56/6 copolymers with different biobased contents were synthesized using biobased pentylenediamine, adipic acid, and caprolactam as the main raw materials. The structure of the synthesized copolymers was characterized using nuclear magnetic analysis (NMR) and infrared analysis (IR). The crystal structure and crystalline properties were investigated using X-ray diffraction (XRD) and differential scanning calorimeter (DSC), while the thermodynamic properties were studied through thermogravimetric analysis (TGA). Furthermore, the mechanical and rheological properties of the copolymers were investigated. The results showed that PA56/6 copolymers exhibited excellent mechanical properties. They displayed tensile strength similar to that of pure PA56 and PA6 but with improved toughness. Moreover, PA56/6 copolymers demonstrated higher thermal stability, lower melting points, and enhanced processing properties. Rheological investigations revealed that compared to PA56 and PA6, PA56/6 copolymers exhibited reduced viscous flow activation energy. As a result, they offered a wider temperature processing range in practical production. Given the numerous benefits offered by bio-based polyamide 56/6 (PA56/6), this versatile material finds extensive utility across diverse applications, including but not limited to automotive engineering, specialty clothing fabrics, and packaging engineering. Exploiting its unique properties, PA56/6 exhibits remarkable potential in addressing various industry-specific challenges, thereby contributing to sustainable and innovative solutions.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2023
·
IF 5.6
Aihua Xu,Yang Yang,Yang Shao,Manyu Jiang,Yongxin Sun,Bo Feng
Neuronal apoptosis and inflammation exacerbate the secondary injury after spinal cord injury (SCI). Four and a half domains 2 (FHL2) is a multifunctional scaffold protein with tissue- and cell-type specific effects on the regulation of inflammation, but its role in SCI remains unclear. The T10 mouse spinal cord contusion model was established, and the mice were immediately injected with lentiviruses carrying FHL2 shRNA after SCI. The results showed that FHL2 expression was increased following SCI, and then gradually decreased. Moreover, FHL2 depletion aggravated functional impairment, neuronal necrosis, and enlarged lesion cavity areas in the injured spinal cord. FHL2 deficiency facilitated neuronal apoptosis by elevating cleaved caspase 3/9 expression, neuroinflammation by regulating microglia polarization, and bone loss. Indeed, FHL2 deficiency increased the secretion of TNF-α and IL-6, M1 microglia polarization, and the activation of STAT1 pathway but decreased the secretion of IL-10 and IL-4, M2 microglia polarization, and the activation of the STAT6 pathway in the spinal cord. In vitro , FHL2 silencing promoted LPS + IFN-γ-induced microglia M1 polarization through activating the STAT1 pathway and alleviated IL-4-induced microglia M2 polarization via inhibiting the STAT6 pathway. FHL2 positively regulated the expression of poly (ADP-ribose) polymerase family member 14 (PARP14) by promoting its transcription. PARP14 overexpression inhibited FHL2 silencing-induced microglia M1 polarization and relieved the inhibitory effect of FHL2 silencing on microglia M2 polarization. Collectively, the study suggests that FHL2 reduces the microglia M1/M2 polarization-mediated inflammation via PARP14-dependent STAT1/6 pathway and thereby improves functional recovery after SCI.
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RSC Advances
·
2020
·Vol. 10
·期 56
·34187-34196
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IF 3.119
Yuan Yuan,Jianwen Wei,Linlin Geng,Dejun Mei,Lei Liao
An amine-bifunctionalized composite strategy was used to fabricate grafted-impregnated micro-/mesoporous composites for carbon dioxide capture. The micro-/mesoporous Beta/KIT-6 (BK) composite containing a high-silica zeolite with a three-dimensional twelve-membered ring crossing channel system and cubic structural silica was used as a support, and 3-aminopropyltrimethoxysilane (APTS) and tetraethylenepentamine (TEPA) were used as the grafted and impregnated components, respectively. The amine efficiency, adsorption kinetics, thermal stability, regeneration performance, and the effects of impregnated amine loadings (30–60%) and temperatures (40–90 °C) on the CO2 adsorption performance were investigated using a thermal gravimetric analyzer (TGA) in the mixed gases (15 vol% CO2 and 85 vol% N2). At 60 °C, the bifunctionalized Beta/KIT-6 (1 mL APTS g−1 BK) displayed the highest CO2 adsorption capacity of 5.12 mmol g−1 at a TEPA loading of 50%. The kinetic model fitting results showed that the CO2 adsorption process was a combination of physical and chemical adsorption, wherein the chemical adsorption is dominant. After five adsorption/desorption cycle regenerations, the saturated adsorption capacity of the composite material was 4.86 mmol g−1, which was only 5.1% lower than the original adsorption capacity. The composites demonstrated excellent CO2 adsorption performance, indicating the promising future of these adsorbents for CO2 capture from actual flue gas after desulfurization.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22028-22038
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IF 2.22
Peng Qirui,Yang Lu,Zhao Qiuying,Ma Yizhou,Ji Hongli,Qiu Jinhao
The development of piezoelectric polymers with superior electromechanical performance is a demand in the areas of flexible sensors, actuators and tissue engineering, among others. In this work, we reported a novel sandwich-structured piezoelectric composites comprising of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and Prussian blue analogs Co 3 [Co(CN) 6 ] 2 with excellent electromechanical activities. The large specific surface area, unique three-dimensional porous nanostructure and redox behavior of Co 3 [Co(CN) 6 ] 2 appeared to significantly promote the interfacial coupling effect within P(VDF-HFP), resulting in enhanced electromechanical response. Moreover, the sandwich structure topological design would enlarge the interfacial coupling effect, strengthen the breakdown strength and consequently raise the electromechanical performance. For instance, a maximum piezoelectric coefficient d 33 of ~ 41 pC/N can be achieved in the sandwiched composites at a loading of 0.8 wt%, which is 1.78 times that of pure P(VDF-HFP). Furthermore, the sandwiched composites possess superior electromechanical coupling factor k 33 up to 0.215, while that of pure P(VDF-HFP) is only 0.134.
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ANALYTICAL LETTERS
·
2020
·
IF 1.467
Yunlong Zhang,Ya Ma,Lishi Wang
A polyfurfural film and copper nanoparticle (Cu NP) modified glassy carbon electrode (GCE) was prepared for the electrochemical determination of 2,4,6-trinitrotoluene (TNT). The polyfurfural film and Cu NPs were prepared by a one-step electrochemical polymerization method and a one-step electrochemical deposition method, respectively. In order to obtain the optimum electrochemical performance, the degree of polymerization of furfural, the deposition time and deposition potential of copper, the enrichment time and enrichment potential of TNT detection, and the pH of the detection solution were optimized. Under the optimal experimental conditions, the modified glassy carbon electrode provided significantly enhanced electro-catalytic activity for TNT with a wide linear detection range from 0.05 to 6 ppm and a low detection limit of 0.0416 ppm due to the excellent synergistic catalytic properties of the polyfurfural film and Cu NPs. The electrode also showed excellent anti-interference ability, stability and reproducibility. Moreover, satisfactory results were obtained when the modified electrode was used for the determination of TNT in tap water samples, showing n excellent prospects for practical applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yifan Li,Hong Sun,Zhen Tian,Yue Li,Xuan Ye,Ruichi Li,Xinyu Li,Shengli Zheng,Jiyuan Liu,Yalin Zhang
The long-term and excessive use of insecticides has led to severe environmental problems and the evolution of insecticide resistance in insects. Carboxylesterases (CarEs) are important detoxification enzymes conferring insecticide resistance on insects. Herein, the detoxification process of Plutella xylostella (L.) carboxylesterase 6 (PxEst-6), one representative P. xylostella carboxylesterase, is investigated with cypermethrin, bifenthrin , cyfluthrin and λ-cyhalothrin. RT-qPCR shows that PxEst-6 is highly expressed in the midgut and cuticles of the third instar larvae. Exposure to pyrethroid insecticides resulted in PxEst-6 up-regulation in a short time. Metabolic assays indicate that PxEst-6 has the capacity to metabolize these pyrethroid insecticides. The combination of molecular docking, binding mode analyses and alanine mutations demonstrated that His451, Lys458 and Gln431 were key residues of PxEst-6 for metabolizing pyrethroids and the acetate groups derived from pyrethroids were key sites for being metabolized by PxEst-6. H451- and K458-derived hydrogen bond (H-bond) interactions with the pyrethroid acetate groups and the polar interactions with the pyrethroid acetate group provided by the Q431 sidechain were crucial to the pyrethroids’ metabolism by PxEst-6. Our study contributes to revealing the reasons for pyrethroid resistance in P. xylostella , and provides a fundamental basis for the development of novel pyrethroid insecticides.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jianan Cai,Zhipeng Liu,Bo Cao,Xiaoxiao Guan,Shumei Liu,Jianqing Zhao
Simultaneously improving the mechanical properties and processability of polyamide-6 (PA6) by chain extension in melting extrusion is usually very difficult. To address this issue, a novel small-molecule triepoxy chain extender (D1) is designed, synthesized, and used to modify PA6. The rheological measurements show that the shear viscosity of PA6 containing 2 wt % D1 decreases by 52.2% compared with that of the original PA6 at a shear rate of 1000 s–1, which is in the shear rate range of thermoplastic processing in the industry. This interesting result is attributed to the generation of a long-chain-branched structure of the macromolecular chains of chain-extended PA6, which reduces the power-law index and aggravates the shear-thinning behavior of the PA6 melt. In addition, the corresponding notched impact strength increases from 62.4 to 105.9 J/m. As a result, this work provides a feasible way to prepare PA6 with excellent mechanical properties and processability in industrial production.
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