Journal of Materials Chemistry C
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2020
·Vol. 8
·期 17
·5913-5922
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IF 7.059
Xiaoping Shen,Kangchen Nie,Li Zheng,Zhaosong Wang,Zhe Wang,Song Li,Chunde Jin,Qingfeng Sun
Taking inspiration from skeletal muscle with highly oriented myofibers, we developed a tough wood aerogel/poly(ionic liquid) (WA/PIL) hydrogel directly from wood via delignification, impregnation and gelation for the formation of a tactile sensor of electric double-layer capacitive configuration. The WA/PIL hydrogels integrated the representative properties of both wood and ionic liquids, being a promising candidate for both polyelectrolyte and separator materials. The influences of the wood texture and cross-linker (Bis) content on the mechanical and sensing performances of the hydrogels were investigated. The results showed that the tangential hydrogel slice with a 1.0 mol% Bis content (tan 1.0) displayed the most significant improvement in compressive stress (1.65 MPa) and deformation (73.3%) at fracture, suggesting the best compressibility. Electrodes also played a significant role in the sensitivity and stability of the sensor devices. While tan 1.0 with reduced graphene oxide (rGO) electrodes displayed the largest sensitivities (1.13–19.70 MPa−1), tan 1.0 with Ni foams possessed much more stable ionic signals within the whole stress range with sensitivities of 0.33–9.67 MPa−1. Due to the wide-stress-range responsiveness of our hydrogel sensor from gentle finger contact to vigorous hitting modes, it will find promising applications in various human–machine interfaces in the fields of electronics, recreation, sports, etc.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Jiayun Chen,Huali Xie,Xuejun Lai,Hongqiang Li,Jiefeng Gao,Xingrong Zeng
High fire-safe aerogel with multi-functionality is urgently desirable due to the frequent fire disasters. However, it is still a challenge to afford both excellent flame retardancy and sensitive fire-warning in combustible aerogels. Herein, we fabricated an ultrasensitive fire-warning and high fire-resistance chitosan/montmorillonite/carbon nanotube composite aerogel (CCA) via freeze-drying. Benefiting from the rapid decrease of the electrical resistance for amino-functionalized carbon nanotube when being burned, CCA achieved a hitherto shortest fire-warning response time (~0.25 s). Importantly, the aerogel exhibited excellent flame retardancy and self-extinguished in the vertical burning test. Besides, owing to the hierarchical porous structure of the aerogel and the excellent barrier effect of the montmorillonite nanosheet, CCA could resist a high-temperature flame up to 1200 °C and effectively prevent the temperature of the nonexposed side from increasing, exhibiting excellent thermal insulation. Furthermore, the mechanical resilience, anti-fatigue performance, electrical conductivity, and unique three-dimensional network endowed the aerogel with good piezoresistivity. This work provides a facile, environmentally-friendly, and cost-effective approach to fabricating multifunctional fire-safe aerogel, showing promising applications in exterior wall insulation, vehicle interior, firefighting, and wearable electronics.
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Water
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2020
·Vol. 12
·期 6
·1838
·
IF 2.544
Kangquan Qi,Mei Chen,Ruobin Dai,Qiang Li,Miaoju Lai,Zhiwei Wang
The removal of pharmaceutical and personal care products (PPCPs) from water and wastewater is of great significance for eco-system safety. In this study, an electrochemical ceramic membrane bioreactor (ECMBR) was developed for removing seven groups (24 kinds in total) of PPCPs from real wastewater. In the presence of an electric field (2 V/cm), the ECMBR could enhance the removal efficiencies for most targeted PPCPs without having adverse impacts on conventional pollutant removal and membrane filtration. The ECMBR achieved higher removal efficiencies for fluoroquinolones (82.8%), β-blockers (24.6%), and sulfonamides (41.0%) compared to the control (CMBR) (52.9%, 4.6%, and 36.4%). For trimethoprim, ECMBR also significantly increased the removal to 66.5% compared to 15.6% in CMBR. Furthermore, the exertion of an electric field did not cause significant changes in microbial communities, suggesting that the enhanced removal of PPCPs should be attributed to the electrochemical oxidation of the built-in electrodes in the ECMBR.Keywords:pharmaceutical and personal care products;electrochemical membrane bioreactor;advanced oxidation process;membrane filtration;wastewater treatment
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Materials Today Energy
·
2020
·
IF 5.604
Qi Sun,Shaoying Wang,Liangling Sun,Jia Liang,Balaji Devakumar,Xiaoyong Huang
At present, near-ultraviolet-pumped white light-emitting diodes (LEDs) based on tri-color (blue, green, and red) phosphors still suffer from insufficient color rendering index (CRI), due to the presence of cyan gap in the 480–520 nm spectral range. To solve this problem, it is urgent to develop an efficient cyan phosphor with emission peak around 490 nm and absorption band in the near-ultraviolet range of 380–420 nm. Herein, a highly efficient cyan-emitting Ca 2 GdHf 2 (AlO 4 ) 3 :Ce 3+ (CGHA:Ce 3+ ) garnet phosphor with internal quantum efficiency as great as 80% is reported. Impressively, the CGHA:1%Ce 3+ sample showed a broad excitation band ranging from 350 to 470 nm with a maximum at 408 nm, and upon 408 nm excitation it exhibited an intense broad cyan emission band in the 420–700 nm wavelength range with peak at 489 nm and a full width at half-maximum of 103 nm. Importantly, by applying the newly discovered cyan-emitting CGHA:1%Ce 3+ phosphors as color converter, the CRI value of the fabricated warm-white LED device is greatly enhanced from 80.5 to 91.6. This work demonstrates that the novel developed CGHA:Ce 3+ cyan phosphors could compensate for the cyan gap and realize full-visible-spectrum lighting, which have a bright prospect in high-quality solid-state white lighting.
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WATER RESEARCH
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2020
·
IF 9.13
Yinqiao Zhang,Huijiao Wang,Yang Li,Bin Wang,Jun Huang,Shubo Deng,Gang Yu,Yujue Wang
The ultraviolet/chlorine (UV/Cl 2 ) process is an emerging advanced oxidation technology for micropollutant abatement in water and wastewater treatment . However, the application of the conventional UV/Cl 2 process in decentralized systems is limited by the transport and management of liquid chlorine. To overcome this limitation, this study evaluated an electrochemically driven UV/Cl 2 (E-UV/Cl 2 ) process for micropollutant abatement under conditions simulating decentralized water treatment . The E-UV/Cl 2 process combines UV irradiation with in situ electrochemical Cl 2 production from anodic oxidation of chloride (Cl − ) in source waters. The results show that with typical Cl − concentrations present in water sources for decentralized systems (30–300 mg/L Cl − ), sufficient amounts of chlorine could be quickly electrochemically produced at the anode to enable E-UV/Cl 2 process for water treatment. Due to its multiple mechanisms for micropollutant abatement (direct photolysis, direct electrolysis, Cl 2 -mediated oxidation, as well as hydroxyl radical and reactive chlorine species oxidation), the E-UV/Cl 2 process effectively eliminated all micropollutants (trimethoprim, ciprofloxacin, metoprolol, and carbamazepine) spiked in a surface water in 5 min. In contrast, at least one micropollutant with ∼20–80% residual concentrations could still be detected in the water treated by 10 min of UV irradiation, chlorination, electrolysis, and the conventional UV/Cl 2 process under similar experimental conditions. The electrical energy per order (E EO ) for micropollutant abatement ranged from 0.15 to 1.8 kWh/m 3 for the E-UV/Cl 2 process, which is generally comparable to that for the conventional UV/Cl 2 process (0.14–2.7 kWh/m 3 ). These results suggest that by in-situ generating Cl 2 from anodic oxidation of Cl − , the E-UV/Cl 2 process can overcome the barrier of the conventional UV/Cl 2 process and thus provide a promising technology for micropollutant abatement in decentralized water treatment systems.
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RSC Advances
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2020
·Vol. 10
·期 42
·25402-25407
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IF 3.119
Xiaodong Lv,Peng Gao
Based on the electron-transfer mechanism between the template and quantum dots (QDs), an optical sensor was structured. It is a phenol sensor, which has the room-temperature phosphorescence (RTP) property of Mn-doped ZnS QDs and high selectivity of molecular imprinted polymers (MIPs). On the surface of the silane modified Mn-doped ZnS QDs, the phenol sensor was prepared by double cross-linker precipitation polymerization in the absence of any stabilizer and additive. Double cross-linkers, divinylbenzene (DVB) and ethyleneglycol dimethacrylate (EGDMA), make a great contribution to the imprinted polymerization with hydrogen-bonding interaction. Then, as a result of the functional monomer, methacrylic acid (MAA), a carboxylic acid was grafted onto the surface of ZnS QDs:Mn@MIPs. Under optimal conditions, the phenol determination experiment had a linear range of 5.0 to 55 μmol L−1 with a correlation coefficient of 0.9984, and a high imprinting factor (IF) of 3.43. In addition, the prepared ZnS QDs:Mn@MIPs were successfully used to detect phenol in real water samples. Therefore, this work provided a highly selective and sensitive RTP probe for phenol determination.
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TRANSITION METAL CHEMISTRY
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2020
·Vol. 45
·期 7
·493-500
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IF 1.366
Yang Xinda,Gu Shunxin,Jiang Qin,Wang Yanqing,Wang Daqi,Shi Pengfei
Abstract A Cu(II) complex [Cu 2 (phen) 2 (NAB) 2 (HO)] n (phen = 1, 10-phenanthroline and NABH = p -N, N-(2-hydroxyethyl)amino benzoic acid) was synthesized, and its structure was confirmed by X-ray diffraction. The structure of the complex appeared to be clamp-like, in which Cu(II) atoms adopt distorted square pyramidal geometry. Each Cu(II) is coordinated by two nitrogen atoms in phen ligand and two carboxyl oxygen atoms from each of the two NABH ligands. The clamp-like coordination units are bridged by adjacent hydroxyethyl groups into infinite 1D chain, which are further linked by extensive O···H hydrogen bonds and π–π interactions to form 3D networks. The titled complex displayed weak double-stranded DNA interaction activity. Spectroscopic and theoretical simulation results indicated that the complex attached onto DNA surface through hydrogen bonding with base pairs. Graphic abstract A novel benzoic acid derivative with two extremity hydroxyethyl groups was designed and used as auxiliary ligand to synthesize mixed coordinating clamp-like Cu(II)-phenanthroline complex. Hydrogen bonding played crucial role in bridging the clamps into infinite 1D chain and also the DNA complex interaction mode.
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 35
·2001478
·
IF 16.836
Cheng Cai,Yuan Teng,Jian-Hao Wu,Jun-Yan Li,Hong-Yan Chen,Jing-Hua Chen,Dai-Bin Kuang
Halide perovskite like methylammonium lead iodide perovskite (MAPbI 3 ) with its prominent optoelectronic properties has triggered substantial concerns in photocatalytic H 2 evolution. In this work, to attain preferable photocatalytic performance, a MAPbI 3 /cobalt phosphide (CoP) hybrid heterojunction is constructed by a facile in situ photosynthesis approach. Systematic investigations reveal that the CoP nanoparticle can work as co-catalyst to not only extract photogenerated electrons effectively from MAPbI 3 to improve the photoinduced charge separation, but also facilitate the interfacial catalytic reaction. As a result, the as-achieved MAPbI 3 /CoP hybrid displays a superior H 2 evolution rate of 785.9 µmol h −1 g −1 in hydroiodic acid solution within 3 h, which is ≈8.0 times higher than that of pristine MAPbI 3 . Furthermore, the H 2 evolution rate of MAPbI 3 /CoP hybrid can reach 2087.5 µmol h −1 g −1 when the photocatalytic reaction time reaches 27 h. This study employs a facile in situ photosynthesis strategy to deposit the metal phosphide co-catalyst on halide perovskite nanocrystals to conduct photocatalytic H 2 evolution reaction, which may stimulate the intensive investigation of perovskite/co-catalyst hybrid systems for future photocatalytic applications.
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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2020
·
IF 3.706
Panpan Zhang,Lihua Kang,Yibin Tong,Chunmei Deng,Mingyuan Zhu,Bin Dai
The ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) was immobilized on zirconia-modified silica, and the resulting BMIMPF6/ZrO 2 –SiO 2 catalysts were used in oxidative desulfurization (ODS) reactions. Experimental results revealed that 10% BMIMPF6/ZrO 2 –SiO 2 exhibited the highest catalytic activity. The properties of the catalysts were studied by Fourier-transform infrared spectroscopy, X-ray diffraction, temperature-programmed desorption, transmission electron microscopy and X-ray photoelectron spectroscopy. Furthermore, the acidities and dispersion of the catalysts were investigated by temperature-programmed desorption and elemental mapping. The desulfurization rate was 99.8% at the optimum reaction conditions of 0.08 g catalyst, 323 K, and O/S = 6, for 2 h. After seven reuse cycles, the catalyst activity was only decreased to 94.1%. Therefore, BMIMPF6/ZrO 2 –SiO 2 is promising as an industrial catalyst for the ODS process.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Xiaoqing Wang,Zizhang Guo,Zhen Hu,HuuHao Ngo,Shuang Liang,Jian Zhang
An innovative ammoniation-hydrothermal method of biochar production was developed for the adsorption of phenanthrene (PHE) from aqueous solutions in this paper. Phragmites australis (PA) was used to produce biochar in a hydrothermal kettle at 280 °C in muffle furnace using urea as an ammoniation reagent. Characterizations were executed by scanning electron microscope (SEM), N 2 adsorption/desorption isotherms, X-ray diffraction (XRD), elemental analysis, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) to explore its morphological, physical, and chemical properties. Batch experiments of PHE adsorption were carried out to study the adsorption isotherms and kinetics. Quantum chemistry computational simulations were employed based on density functional theory (DFT) to establish and optimize adsorption configurations and analyze the biochar's structural effects on adsorption performance. Results showed that the ammoniation-hydrothermal method produced biochar with a higher surface area and a maximum equilibrium adsorption capacity of 1.97 mg/g. The adsorption fitted well with Freundlich isotherm model (R 2 > 0.96) and Pseudo-second-order kinetic model (R 2 > 0.82). Adsorption energy calculation revealed that the N functionalities, especially pyridine N in the N-doped biochar structure, exhibited stronger binding ability with PHE, which contributed most to the favorable adsorption ability of the ammoniation-hydrothermal biochar.
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Gastroenterology Research and Practice
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2020
·
IF 1.806
Guo-xiang Wang,Yan-li Xiang,Hong-gang Wang,Yang-de Miu,Guang Yu
Evodiamine (Evo) is an indole alkaloid extracted from the traditional Chinese medicinal herb Evodia rutaecarpa. Evo may regulate gastrointestinal motility, but the evidence is insufficient, and the mechanisms remain unknown. The aim of this study was to investigate the effect of Evo on colonic motility of rats and the underlying mechanisms in vitro. Rat colonic muscle was exposed to Evo (10 and 100 μM) followed by immunohistochemistry of cholecystokinin receptor 1 (CCK1R). Muscle contractions were studied in an organ bath system to determine whether CCK1R, nitric oxide (NO), and enteric neurons are involved in the relaxant effect of Evo. Whole-cell patch-clamp was used to detect L-type calcium currents () in isolated colonic smooth muscle cells (SMCs). CCK1R was observed in SMCs, intermuscular neurons, and mucosa of rat colon. Evo could inhibit spontaneous muscle contractions; NO synthase, inhibitor L-NAME CCK1R antagonist, could partly block this effect, while the enteric neurons may not play a major role. Evo inhibited the peak in colonic SMCs at a membrane potential of 0 mV. The current-voltage (I–V) relationship of L-type calcium channels was modified by Evo, while the peak of the I–V curve remained at 0 mV. Furthermore, Evo inhibited the activation of L-type calcium channels and decreased the peak . The relaxant effect of Evo on colonic muscle is associated with the inhibition of L-type calcium channels. The enteric neurons, NO, and CCK1R may be partly related to the inhibitory effect of Evo on colonic motility. This study provides the first evidence that evodiamine can regulate colonic motility in rats by mediating calcium homeostasis in smooth muscle cells. These data form a theoretical basis for the clinical application of evodiamine for treatment of gastrointestinal motility diseases.
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ANALYTICA CHIMICA ACTA
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2020
·
IF 5.977
Xiaoting Lian,Zibo Feng,Rong Tan,Xiaona Mi,Yifeng Tu
In this paper, a promising technology for obtaining an early indication and making a clinical diagnosis of coronary heart disease (CHD) is successfully designed. Specifically, label-free biosensors based on Au–Co nanoparticles (Au–Co NPs) were utilized to detect low-density lipoprotein (LDL) and oxidized low-density lipoprotein (ox-LDL), which are both CHD biomarkers. Conductive Au–Co NPs provided a prominent sensing platform and played the role of an efficient electrochemiluminescent (ECL) signaling amplifier. Conductive Au–Co NPs were fabricated using a simple method of water phase synthesis and were characterized using transmission electron microscope (TEM) and scanning electron microscope (SEM) images. An antibody was immobilized onto Au–Co NP-decorated indium tin oxide coated glass. After the formation of an immune complex between the antigen and antibody, using luminol as a sensing probe, it was found that the ECL signal was inhibited. Under the optimized conditions, the immunosensor exhibited sensitive detection of LDL over a wide linear range from 0.420 to 100 pg mL −1 with a detection limit of 0.256 pg mL −1 . Likewise, a linear regression of the concentration of ox-LDL was obtained over the range from 0.500 pg mL −1 to 60.0 pg mL −1 , with a detection limit of 0.330 pg mL −1 . This research provides a new method for making a clinical diagnosis and obtaining an early indication of CHD due to the high performance sensing of these two biomarkers.
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