RSC Advances
·
2020
·Vol. 10
·期 13
·7619-7627
·
IF 3.119
Chunmei Xiao,Jianming Lin
The existence of Pb(II) ions in water systems poses significant potential hazards to public health and the environment. In the present study, poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) brush-modified Ni3Si2O5(OH)4 nanotubes were prepared, and their adsorption efficiency against the Pb(II) ions was investigated. The characterization results of FTIR spectroscopy, TGA, TEM, and XPS indicated the successful grafting of PAMPS on the surface of free Ni3Si2O5(OH)4 NTs, and the prepared PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited a 6–8 nm grafting layer, which could provide abundant binding sites for metal adsorption. During the Pb(II) removal process, a pH-dependent adsorption behavior was observed, and the adsorption processes fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm model. Compared with unmodified Ni3Si2O5(OH)4, the PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited obviously faster adsorption of Pb(II) and higher equilibrium adsorption capacity for the removal of Pb(II). The maximum adsorption capacity calculated via the Langmuir isotherm model was 0.653 mmol g−1 (135.3 mg g−1) at 298 K. In a metal coexisting system, the total adsorption capacity of the NTs was increased; this indicated the potential of the proposed NTs in the removal of Pb(II) from metal coexisting wastewater. This study showed the significant potential of PAMPS-g-Ni3Si2O5(OH)4 NTs in the effective removal of Pb(II).
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ACS Omega
·
2020
·
IF 2.87
Yao Feng,Juanjuan Yin,Shufeng Liu,Yuying Wang,Bingfan Li,Tifeng Jiao
Poly(ethylene imine) (PEI) has abundant amino groups in a macromolecular chain and can be used as a graft source for metal nanocomposites, which shows excellent ability to form stable complexes with heavy metal ions. In this work, a simple and convenient method was used to make PEI into a stable hydrogel with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide-N-hydroxysuccinimide and subsequently coprecipitate with silver nitrate solution or palladium chloride solution to form metal-loaded composite hydrogels. In addition, the characterizations of composite hydrogels were investigated by scanning electron microscopy, specific surface area tests (Brunauer–Emmett–Teller), X-ray photoelectron spectroscopy, and ultraviolet spectroscopy. The properties of composite hydrogels on the catalytic reduction of 4-nitrophenol were studied. The results showed that the composite hydrogels could be easily separated from the water environment, which indicated the large-scale potential application in organic catalytic degradation and wastewater treatment.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·3087-3096
·
IF 3.288
Gang Li,Peng Sun,Fanggen Wu,Jie Zhao,Dongxue Han,Guofeng Cui
4-Aminophenol (4-AP) is a highly toxic environmental pollutant and contaminant of medicine, which is widely used in industries and daily life. Therefore, the development of a reliable sensor for determining the amount of 4-AP is of great importance for the protection of human and environmental health. Herein, by fabricating a Pd@CeO2 composite on a nanoporous gold-coated carbon fiber paper (NPG/CFP), the sensing properties for 4-AP can be largely enhanced. Combining the significant increase in the catalytic activity of the Pd@CeO2 composite (derived from the strong interactions between Pd and CeO2) with the NPG and NPG/CFP hierarchical porous structure having a high electrochemically active surface area, the electrode achieved excellent detection of 4-AP. It manifested an extremely high sensitivity of 75.4 μA μM−1 and 56.5 μA μM−1 in the concentration range from 0.005 μM to 0.03 μM and 0.03 μM to 9 μM, respectively. The detection limit reached as low as 4 nM under optimized conditions (S/N = 3). The electrode also possesses long-term stability and presents great anti-interference ability. All these results demonstrate that the electrode is a promising candidate for future sensors for monitoring 4-AP in water and pharmaceuticals.
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SOLID STATE IONICS
·
2020
·
IF 3.107
Chang Su,Pengju Guo,Lihuan Xu
The Li (tri-(4-carboxyphenyl) amine) (Li-TCPA 2 ) doped polypyrrole (PPy-Li-TCPA 2 ) composites were successfully prepared by in-situ chemical oxidation using pyrrole and Li-TCPA 2 as raw materials. The structure, morphology, electrochemical properties of prepared materials were characterized by fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), specific surface area test (BET), scanning electron microscopy (SEM), cyclic voltammogram (CV) and electrochemical impedance spectra (EIS), respectively. Also, the charge-discharge properties of the prepared composites were studied by galvanostatic charge-discharge testing. The results demonstrated that as-prepared composite material exhibited a reversible redox process at 2.0–4.0 V. And the discharge specific capacity for PPy-Li-TCPA 2 (2:1) and PPy-Li-TCPA 2 (6:1) are 50.4 mAh·g −1 and 63.7 mAh·g −1 as measured at 30 mA·g −1 between 2.0 and 4.0 V, while PPy-Li-TCPA 2 (4:1) exhibited the discharge specific capacity of 91.1 mAh·g −1 , which were remarkably higher than that of the pure PPy (29.5 mAh·g −1 ) under the same experimental conditions. At the same time, PPy-Li-TCPA 2 (4:1) has improved rate performance and stable cycleability. The excellent electrochemical properties are attributed to the introduction of Li-TCPA 2 as dopant , which improved the electrical conductivity and the redox activity of PPy. Furthermore, the resulted well-dispersed particle structure of the composite as well as its improved specific surface area for doped PPy facilitated to the contact of the electrolyte with the active material, leading to the increased utilization ratio of active material and the enhanced electrochemical performances .
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Misganaw Alemu Zeleke,Dong-Hau Kuo
The quaternary chalcogenide Cu 2 Zn(Sn 1-x Ge x )(S,Se) 4 bulks, where x is G e / [ G e + S n ] molar ratios of 0, 0.15, 0.30, and 0.45 were synthesized via reactive liquid phase sintering at 600 °C for 30 min in the tube furnace and characterized systematically. Together with Sb 2 S 3 as a reactive liquid phase sintering aid, the effects of Ge incorporation on densification, grain boundary, crystal phase purity, crystalline size, and electrical properties were studied. The morphology of the resulted Cu 2 Zn(Sn 1-x Ge x )(S,Se) 4 bulk was found to be more densified and compacted at G e / [ G e + S n ] molar ratio of 0.15 compared to the rests. The X-ray diffraction peaks were shifted towards a higher angle as Ge fraction was increased. The hole concentrations for the entirely p-type bulks were determined to be 3.67 × 10 18 , 1.40 × 10 18 , 1.28 × 10 18 , and 8.90 × 10 17 cm −3 at G e / [ G e + S n ] molar ratios of 0, 0.15, 0.30, and 0.45, respectively. The effects on conductivity and mobility were consistent with their interrelations. Hence, the synthesis and study of Ge incorporated Cu 2 ZnSn(S,Se) 4 bulk using powder technique allows identifying the composition which is expectedly more important for the fabrication of thin film solar cells.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Longlong Geng,Zhihui Lin,Zhaojun Li,Su An,Xiuling Zhang,Zhongmin Liu,Da-Shuai Zhang,Yong-Zheng Zhang,Shuang Gao,Haixiang Han
Rational engineering the structural and superficial characters of catalysts to tailor their properties is a pursuit for the catalyst design . In this work, via an ultrasonic-assisted H 2 O 2 etching strategy, a kind of copper oxide catalyst (CuO-60) with a holey lamellar structure was prepared and structurally characterized by a series of characterization techniques including SEM, HRTEM , XRD , N 2 adsorption, XPS and H 2 -TPR. Interestingly, this strategy can not only generate defect rich surface but also achieve morphology reconstruction, thereby affording high-density active sites on CuO-60. As a low-cost catalyst, CuO-60 displays exceptional high catalytic activity and stability for the hydrogenation of 4-nitrophenol (4-NP) under mild conditions (25 °C and 1 atm). The 4-NP conversion over CuO-60 reaches up to 99% within 12 min, which is nearly 43-fold faster than that of the pristine CuO control. The correlation between the microstructure of the catalyst and the enhanced catalytic performance was well established. The outstanding catalytic properties can be ascribed to the synergistic effects of structure porousness, which renders in more exposed active sites, and unique redox behavior of electropositive Cu sites during catalytic process. Additionally, a catalytic mechanism is also proposed and rationalized.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Chunping Ma,Gaoyi Xie,Yangchun Tao,Hongni Zhu,Yi Zhang,Zhenguo Chi,Siwei Liu,Jiarui Xu
Three diblock copolymers ( PTPEE-PNns ) with controllable polymer structures were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization, combining 1-ethenyl-4-(1,2,2-triphenylethenyl)-benzene (TPEE) and N-isopropylacrylamide (NIPAM). All PTPEE-PNns copolymers showed remarkable aggregation-induced emission (AIE) characteristic. Due to the amphiphilic structure of the copolymers, PTPEE-PNn micelles (mainly hollow) were prepared with either “precipitation” or “dialysis” method, respectively. Scanning electron microscopy, transmission electron microscopy , dynamic light scattering and fluorescence methodology were performed to investigate the morphology, size distribution and stability of the micelles, revealing the effects of molecular weight and micelle preparation method on the nanostructure of the micelles. The PTPEE-PN2 hollow micelles prepared by the “dialysis” method had the advantages of small particle size, extremely narrow particle size distribution , remarkable thermal sensitivity, excellent particle stability, and showed good biocompatibility and fluorescence emission capability in cell imaging . This work would inspire more approaches to prepare novel AIE-active, thermoresponsive and biocompatible polymers for biomedical application .
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FOOD AND CHEMICAL TOXICOLOGY
·
2020
·
IF 4.679
Desen Yang,Wanqin Wu,Guoping Gan,Dingkun Wang,Jing Gong,Ke Fang,Fuer Lu
The neuroprotective effects and potential mechanisms of (-)-Syringaresinol-4-O-β-D-glucopyranoside (SRG), a natural lignan glycoside extracted from Cortex Albizziae , were investigated using corticosterone (CORT)-induced PC12 cells as an in vitro anxiety model. PC12 cells were treated with 100 μM CORT and 5, 10, or 20 μM SRG for 48 h. Cell viability and lactate dehydrogenase (LDH) leakage were measured. Apoptosis were detected using FITC-coupled Annexin V (AV) and propidium iodide (PI) staining flow cytometric analyses and TUNEL assays. Rhodamine 123 and Fluo-3-AM staining flow cytometric analyses were used to detect mitochondrial membrane potential (ΔΨm) and intracellular calcium concentration ([Ca 2+ ] i ), respectively. Western blot was used to detect brain-derived neurotrophic factor (BDNF), Bax, Bcl-2, cAMP-response element binding protein (CREB), cytosolic cytochrome c (Cyt c ), caspase-3, and cleaved caspase-3. Experimental data showed that SRG promoted cell proliferation , reduced LDH release, inhibited apoptosis, improved ΔΨm values, decreased [Ca 2+ ] i , up-regulated CREB, BDNF, and Bcl-2, down-regulated Bax and Cyt c protein expression levels, and reduced caspase-3 activity. This suggests that SRG has neuroprotective and antiapoptotic effects in the pathogenesis of anxiety disorders, and its mechanisms are partly connecte to inhibition of the mitochondrial apoptotic pathway and activation of pathways involving CREB and BDNF.
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NEUROSCIENCE
·
2019
·
IF 3.244
Lanqiu Zhang,Jinlu Zhang,Xiaolin Jiang,Lei Yang,Qi Zhang,Botao Wang,Lihua Cui,Ximo Wang
Neuroinflammation has been implicated in the mechanism underlying the progression of neurodegeneration and infectious neuropathology. Growing evidence suggest that hydroxytyrosol (3,4-dihydroxyphenil-ethanol, HT), one of the main polyphenols presented in extra virgin olive oil (EVOO), has shown potential anti-inflammatory and neuroprotective effects. However, the potential anti-neuroinflammation activity and underlying mechanism of HT remain poorly understood. The present study aimed to investigate the effects of HT on lipopolysaccharide (LPS)-induced inflammation in both in vitro and in vivo models and the associated molecular mechanism. Our results revealed that HT significantly reduced the production of pro-inflammatory mediators in BV2 microglia and primary microglia cells. Phenotypic analysis showed that HT significantly reduced M1 marker CD86 expression and increased M2 marker CD206 expression. In addition, HT significantly decreased the levels of phospho-NF-κB p65 and phospho-extracellular signal-regulated kinase (ERK) in a dose-dependent manner. Moreover, HT suppressed the LPS-induced Toll like receptor 4 (TLR4) in BV2 microglia. In vivo administration of HT following LPS injection significantly reduced some proinflammatory mediator levels and microglia/astrocyte activation in the brain. Together, these results suggest that HT suppressed the LPS-induced neuroinflammatory responses via modulation of microglia M1/M2 polarization and downregulation of TLR-4 mediated NF-κB activation and ERK signaling pathway.
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CHEMICO-BIOLOGICAL INTERACTIONS
·
2022
·
IF 5.168
Moath Refat,Guoqiang Zhang,Abdulaziz Ahmed A.Saad,Salem Baldi,Fang Zheng,Xin'an Wu
Cholestasis is primarily caused by bile acid homeostasis dysregulation, resulting in retention, aggregation, and accumulation of the toxic cholate in the hepatocytes. Existing therapies for cholestasis are limited, demanding the urgent development of novel drugs. As a result, targeting FXR specifically promises a unique treatment strategy for cholestasis. The current study aims to evaluate the influence of 7, 8-dihydroxy-4-methyl coumarin (DMC) against alpha-naphthyl isothiocyanate (ANIT)-induced liver injury in mice. The “Computer-Aided Drug Design” (CADD) and molecular docking study anticipated that DMC would proficiently bind and activate the FXR. Accordingly, the hepatoprotective activity of DMC against ANIT-induced hepatotoxicity and cholestasis was investigated in ANIT-treated HepaRG cells and the ANIT-induced cholestatic mouse model. Outcomes indicated the protective effects of DMC against ANIT toxicity in HepaRG cells after 24 h of intervention and animals after seven days of treatment. DMC partially blocks ANIT-induced increases in serum markers of hepatocellular injury , liver and gall bladder enlargement , and hepatic necrosis . Western blotting revealed that DMC alleviates ANIT-induced hepatotoxicity and cholestasis via activating the FXR receptor and regulating CYP7A1 , the enzyme responsible for bile acid synthesis. DMC exhibited protective activity against cholestasis through activating FXR, suggesting it might be a promising strategy for preventing and treating cholestatic liver disease.
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ANALYST
·
2022
·Vol. 148
·期 3
·628-635
·
IF 5.227
Wei Zhu,Jing-Yi Tang,Dong Yu,Ai-Guo Shen
Biofilms are known to be a great challenge for their anti-bacterial activity as they obstruct drug action for deeper and more thorough bacteria-killing effects. Therefore, developing highly effective antibacterial agents to destroy biofilms and eradicate bacteria is of great significance. Herein, a new type of nanocomposites (denoted as poly(4-cyanostyrene)@silver@polylysine) is proposed, in which polylysine (PLL) could rapidly capture the biofilms and exhibit excellent antibacterial efficacy together with decorated silver (Ag) nanoparticles (NPs) through the charge effect and Ag+ release. Notably, nearly 100% antibacterial rates against Gram-positive bacterium (Staphylococcus aureus, S. aureus) and Gram-negative bacterium (Escherichia coli, E. coli) were achieved. More importantly, poly(4-cyanostyrene) with biological silent Raman imaging capacity is able to illustrate the relationship between antibacterial efficiency and biofilm breakage. In short, such novel nanocomposites can improve the bioavailability of each component and display tremendous potential in antibacterial applications.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shujun Zhu,Jianguo Pan,Xinxin Chen,Hongbing Chen,Shangke Pan
Recently, zero-dimensional organic-inorganic lead halides perovskites have garnered considerable attention due to their exceptional photoelectric performance, however, the toxicity of lead makes their prolonged application difficult. In this work, centimeter-scale lead-free zero-dimensional perovskites [Emim] 4 [Cu 4 I 8 ] single crystals were grown by the solution evaporation method. The structure and composition of the crystals were analyzed using XRD , EDS , XPS , etc. The energy band structure and the partial density of states (PDOS) were calculated by using the density functional theory (DFT) based on the PBE hybrid functional. The excitation and emission spectra of the crystal material were determined under different conditions. The luminescence mechanism and fluorescence lifetime of the crystal were also analyzed, and the green emitting of the crystal was caused by self-trapped excitons (STEs). Interestingly, the compound showed excellent responsiveness to X-rays, which is rarely reported in organic-inorganic hybrid copper-based halides. Overall, [Emim] 4 [Cu 4 I 8 ] demonstrates its good potential.
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