JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 13
·7862-7878
·
IF 4.22
Cao Xue-Fang,Yue Pan,Wei Qiu-Rui,Dang Yun-Fei,Zhang Si-Qi,Wei Zhi-Xian,Wang Rong-Zhen
In this study, a solar-driven photocatalyst La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. Results show that p – n heterojunction was formed, and it has considerable photocatalytic properties under ultraviolet light and solar irradiation. More importantly, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) also exhibits Fenton-like catalytic performance in the presence of H 2 O 2 and oxalic acid (OA). The main reactive radicals of the La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 –H 2 O 2 –OA–sunlight system are h + , · OH and · O 2 − . The chemical oxygen demand removal rate of MO wastewater in La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%)–H 2 O 2 –oxalic acid–sunlight system reached 72.4%; the value was higher than that of the sum of single photocatalysis (34.5%) and Fenton-like-dark system (27.6%), indicating that there is a synergistic effect between the photocatalysis and Fenton-like on MO degradation. In addition, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) displays approximately superparamagnetism and has higher saturated magnetization ( M s ), low coercive force and residual magnetism. So it can be easily recovered by an external magnetic field and can be reused 6 times. It was anticipated that La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure is a stable and reusable solar-light-driven magnetic photocatalyst and has great potential applications for wastewater treatment. Graphical abstract The magnetic La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized by different methods. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. It is not only a solar-driven photocatalyst with high efficiency, but also shows excellent Fenton-like catalytic effect. And the photocatalysis and Fenton-like system exhibited synergetic catalytic effect on MO degradation by La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%). Furthermore, near superparamagnetic characteristics of the catalyst make it easy to recycle by the external magnetic field and can be reused for 6 times, suggesting that it is a stable multifunctional catalyst.
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Materials Research Express
·
2021
·Vol. 8
·期 10
·105009
·
IF 1.62
Pham Tan Thi,Le Van Thang,Tran Van Khai,Tran Xuan Diem,Chau Ngoc Trong Nghia,Tran Thi Thanh Ngan,Le Minh Tri,Nguyen Ngoc Vinh,Nguyen Minh Hien
p-Aminophenol (PAP) is an important intermediate reagent in the synthesis of paracetamol, widely used as an analgesic and antipyretic drug. Therefore, finding an effective catalyst to improve PAP synthesis efficiency is worth studying. Among those studies, nanocomposite is the most promising material. In this study, Ag/GO nanocomposites were synthesized by reducing silver nitrate on graphene oxide (GO) with sodium borohydride as a reducing agent and characterized by SEM, EDX, XRD and UV–vis methods. The catalytic ability was investigated based on the hydrogenation reaction of p-nitrophenol (PNP). We successfully synthesized Ag/GO nanocomposite with relatively homogeneous distributions and similar particle sizes. The results showed that Ag/GO nanocomposite has an excellent catalytic activity with the yield of reduction reaction at 97%, 3 min. Moreover, this photocatalyst can easily be recovered and reused three times without any reaction efficiency reduction. We also successfully synthesized and crystallized PAP with high purity and the total yield of 45.82%. The results show that Ag/GO nanocomposite is an excellent catalyst for high-performance reactions with many useful properties, such as easily recovered and repetitive used. On top of that, Ag/GO nanocomposite is safe, less toxic and environmentally friendly.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoyan Wang,Mingxing Hou,Zhenglu Shi,Xiang Liu,Isao Mizota,Hongtao Lou,Bin Wang,Xianhua Hou
Heteroatom-doped hard carbon is a popular method to optimize the electrochemical performance of anode electrodes for sodium-ion batteries. Herein, phosphorus-doped hollow carbon nanorods (P-HCNs) are obtained by a one-step synthesis with a high phosphorus content of 7.5 atom %. By controlling the P configuration, the P-HCNs03 exhibits reversible capacity as high as 260 mA h g–1 at the current density of 1.0 A g–1 after 500 cycles with an initial Coulombic efficiency (ICE) of 73%. When the amount of phosphorus in the as-prepared materials is changed, the different structures of the P-doped carbon lattices are analyzed by X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. Based on the first-principles calculation, although the P–O bond has the most configurations, the excellent reversible capacity of the electrode is attributed to the strong Na-absorption ability of P═O and P–C bonds. The sodium-based dual-ion batteries (NDIBs) assembled with P-HCNs03 as an anode and expanded graphite as a cathode (P-HCNs03//EG) exhibited a high energy density of 138 W h kg–1 at a power density of 159 W kg–1. The results provide an important angle to optimize the performance of hard carbons with other functionalized heteroatoms.
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高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Dashui Yuan,Zongyuan Li,Xueru Chen,Jing Ding,Hui Wan,Guofeng Guan
Proper interface and band alignment always play essential roles in the separation of photoexcited charge of photocatalysts. In this work, we prepared a homodispersed S-scheme carbon nitride homojunction with local electron structure difference by a facile pre-doping and two-step calcination approach. Boron doping into heptazine created extra acceptor impurity, and phosphorus doping into heptazine created extra donor impurity, which eventually modulated the electronic structure of carbon nitride. As heptazines with different element doping were integrated into carbon nitride by recalcination, B–CN and P–CN formed a homodispersed homojunction and thus produced a rich interface. Meanwhile, caused by Fermi energy levels equilibrium, the band bending constructed an S-scheme homojunction, which stimulated photogenerated electrons to transfer from CB of B–CN to VB of P–CN. The homodispersed S-scheme homojunction structure led to efficient suppression of recombination of photoinduced charge and retained stronger redox charge. Consequently, the photocatalytic performance was dramatically boosted to 2620 μmol g −1 from 60 μmol g −1 of pure CN in 4-h hydrogen evolution from water. This novel method for electron structure engineering helped to provide a new strategy for designing homojunction photocatalysts with excellent photocatalytic performance.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Bolin Tang,Xiaojun Shen,Yaru Yang,Zhi Xu,Jie Yi,Yongbo Yao,Miao Cao,Yalin Zhang,Hongqin Xia
Cellular responses can be regulated and manipulated through combining stimuli-responsive biomaterial with external stimulus. In this present, the magneto-responsive CoFe 2 O 4 /P(VDF-TrFE) nanocomposite coatings were designed to understand cell behaviors of preosteoblasts, as well as get insight into the underlying mechanism of osteogenic differentiation under static magnetic field (SMF). CoFe 2 O 4 /P(VDF-TrFE) nanocomposite coatings with differential magnetic property (low, medium and high magnetization) were prepared by incorporation of different mass fraction of CoFe 2 O 4 nanoparticles (6%, 13 %, 20 %) into P(VDF-TrFE) matrix. Cell experiments indicated that all nanocomposite coatings with the assistance of SMF could promote the cell attachment, proliferation and osteogenic differentiation of MC3T3-E1 cells. Among different nanocomposite coatings, low magnetization coating (6%) showed a higher ALP activity and gene expression of Runx2, Col-I, OCN. Molecular biology assays demonstrated that the combination of nanocomposite coatings and SMF could significantly up-regulate the expression level of α2β1 integrin and p-ERK. Whereas, the addition of inhibitor U0126 down-regulated sharply the expression level of p-ERK, which indicated that cellular osteogenic differentiation of MC3T3-E1 cells was governed through α2β1 integrin-mediated MEK/ERK signaling pathways during CoFe 2 O 4 /P(VDF-TrFE) nanocomposite coatings were combined with SMF. This work provided a promising strategy to enhance cellular osteogenic differentiation through a remote-control manner, which exhibited great potential in the application of bone tissue repair and regeneration.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhuowei Cheng,Junjie Wang,Dongzhi Chen,Jianmeng Chen,Lining Wang,Jiexu Ye,Jianming Yu
The coupling of wet scrubber with thermally activated persulfate (PS) for the removal of gaseous p-xylene was studied in the present work. The effects of process parameters (i.e., activation temperature, gas flow rate, PS dosage, and absorption solution pH) on p-xylene removal were studied. The removal efficiency increased with the activation temperature and PS dosage, while decreased with the increase of gas flow rate. The inhibition effect was observed when the pH of the reaction system was alkaline due to the existence of NH 3(aq) resulting from ammonium translation. P-xylene was efficiently eliminated under the optimal conditions with a maximum removal efficiency of 78.5%. The most important radicals, namely, SO 4 − and HO , were investigated by electron paramagnetic resonance, and the selectivity of SO 4 − was determined by quenching tests. HO and SO 4 − oxidations accounted for 41.3% and 37.4% of the removal of p-xylene, respectively. The contribution of SO 4 − increased with the accumulation of H + . Moreover, the absorption solution reused via adding PS and it still showed perfect removal capacity for p-xylene at the end of each cycle. Finally, a possible degradation pathway of p-xylene was proposed based on the measurements of intermediates being detected in the gas and liquid phases.
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高影响因子
International Journal of Nanomedicine
·
2020
·
IF 5.115
Gaofeng Liang,Hao Shi,Yijun Qi,Jinghua Li,Aihua Jing,Qiwei Liu,Wenpo Feng,Guangda Li,Shegan Gao
Introduction Biofilms protect bacteria from antibiotics and this can produce drug-resistant strains, especially the main pathogen of periodontitis, Porphyromonas gingivalis. Carbon quantum dots with various biomedical properties are considered to have great application potential in antibacterial and anti-biofilm treatment.Methods Tinidazole carbon quantum dots (TCDs) and metronidazole carbon quantum dots (MCDs) were prepared by a hydrothermal method with the clinical antibacterial drugs tinidazole and metronidazole, respectively. Then, TCDs and MCDs were characterized by transmission electron microscopy, UV–visible spectroscopy, infrared spectroscopy and energy-dispersive spectrometry. The antibacterial effects were also investigated under different conditions.Results The TCDs and MCDs had uniform sizes. The results of UV–visible and energy-dispersive spectrometry confirmed their important carbon polymerization structures and the activity of the nitro group, which had an evident inhibitory effect on P. gingivalis, but almost no effect on other bacteria, including Escherichia coli, Staphylococcus aureus and Prevotella nigrescens. Importantly, the TCDs could penetrate the biofilms to further effectively inhibit the growth of P. gingivalis under the biofilms. Furthermore, it was found that the antibacterial effect of TCDs lies in its ability to impair toxicity by inhibiting the major virulence factors and related genes involved in the biofilm formation of P. gingivalis, thus affecting the self-assembly of biofilm-related proteins.Conclusion The findings demonstrate a promising new method for improving the efficiency of periodontitis treatment by penetrating the P. gingivalis biofilm with preparations of nano-level antibacterial drugs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ce Gao,LingPing Xiao,Jinghui Zhou,Haisong Wang,Shangru Zhai,Qingda An
A new type of nanosilver immobilized catalyst based on glycine modified lignin hydrogels with excellent catalytic performance towards p -nitrophenol reduction have been prepared. Glycine was used to provide amino and carboxy groups for complexing silver ions, simultaneously which was also beneficial for in-situ reduction and suppression of silver nanoparticles. As-prepared composites were characterized by X-ray diffraction, scanning electron microscope with EDS, high-resolution transmission electron microscope, X-ray photoelectron spectroscopy, Fourier Transform Infrared Spectrometer and Thermal Gravimetric Analyzer. The developed network with enriched anchoring sites could provide the stability during the catalytic process and enough traction to disperse and stabilize the silver nanoparticles. Batch experiments of 4-NP hydrogenation were carried out to correlate the catalytic performance. The concentration of 4-NP of 5 mmol/L could be finished with only 101 s and the rate of k was 0.0151 s −1 . Moreover, fixed-bed experiments were creatively applied for the tests and the catalyst can maintain high efficiency about 300 min with the flowing rate of 3 mL/min. After being reused ten cycles, the catalyst retained the conversion rate beyond 98%; and the structure has no obvious deterioration and the leaching of nanosilver was neglectful, which could be attributed to the crucial role of introduced glycine component.
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高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 4
·884-891
·
IF 3.117
Changle Wang,Lipeng Zhang,Ping Yang
Transition-metal phosphides have been identified as effective materials for improving electrocatalytic hydrogen evolution. In this study, Ni2P, Co2P, and NiCoP yolk–shell structures were embedded in N- and P-doped carbon nanofibers (NPNFs) by controlling the heat-treatment procedure of the fiber precursors. The hydrogen evolution reaction (HER) activity of the samples was tested. The formation process of phosphides introduced a large number of surface defects that act as active sites to improve H2 evolution. NPNF embedding composite NiCoP particles exhibited better performance compared with Ni2P–NPNFs and Co2P–NPNF samples in acidic conditions. In the case of a molar ratio Ni : Co : P of 1 : 1 : 1, NiCoP-decorated NPNFs revealed the best HER performance, which is ascribed to the loading of NiCoP composite particles, which greatly increased the specific surface area. NiCoP–NPNFs exhibited overpotentials of 183 and 280 mV at current densities of 1 mA cm−2 and 10 mA cm−2, respectively, with a Tafel slope of 94.5 mV dec−1.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Zijun Pang,Yajuan Cai,Weihao Xiong,Junyang Xiao,Jing Zou
A new spectrophotometric method for measuring permanganate index (chemical oxygen demand using potassium permanganate (KMnO 4 ) as oxidant, COD Mn ) in water was established. The method was based on the rapid oxidation of N,N -diethyl- p -phenylenediamine (DPD) by residual KMnO 4 in digestion solution under neutral pH condition to form the stable pink radical (DPD ●+ ). Only 20 s were enough to form the pink DPD ●+ . The generated DPD ●+ could be quantitatively measured by a visible spectrophotometer at 551 nm. Stoichiometric coefficient of the reaction between KMnO 4 and DPD was close to 1:5 (1:5.07). There was a well linear relationship (R 2 = 0.999) between the change of the absorbance of DPD ●+ at 551 nm and the concentration of COD Mn in the range of 0–4.46 mg L −1 . Limit of detection of the DPD method was as low as 0.02 mg L −1 COD Mn . The DPD method was highly accurate for measuring COD Mn in standard solutions with well recovery rates of 99.17%–102.22%, and was well tolerant to the interference of coexistent Cl − and Fe 3+ . The DPD method was successfully applied for measuring COD Mn in real water samples, including surface water, underground water and drinking water . In comparison to the traditional titration method, the proposed DPD method was more convenient to operate, required less samples and digestion reagents (i.e., KMnO 4 and H 2 SO 4 ) and could be employed for online monitor.
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高影响因子
RARE METALS
·
2020
·Vol. 40
·期 6
·1571-1577
·
IF 2.161
Zhu Meng-Ya,He Ping,Yang Xue-Li,Hui Guang-Ze,Tang Cheng-Chun,Pan Guo-Feng,Bie Li-Jian
Abstract P-xylene (p-C 8 H 10 ) is extremely harmful and dangerous to human health due to high toxicity and strong carcinogenicity. Exploring sensitive material to effectively detect p-xylene is of importance. In this paper, perovskite single crystal (C 4 H 9 NH 3 ) 2 PbI 4 has been successfully synthesized via solution method. The obtained product was analyzed by single crystal X-ray diffraction. With the space group Pbca, orthorhombic (C 4 H 9 NH 3 ) 2 PbI 4 layered perovskite structure consists of an extended two-dimensional network of corner-sharing PbI 6 octahedron. Single layer perovskite sheets of distorted PbI 6 octahedron alternated with protonated n-butylammonium cation bilayers, which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Density functional theory (DFT) simulations regarding the adsorption energy revealed that this organic–inorganic hybrid perovskite compound has excellent selectivity toward p-xylene compared with other gases including C 2 H 5 OH, C 6 H 6 , CH 2 Cl 2 , HCHO, CH 3 COCH 3 and C 7 H 8 . The calculation of electron density, density of states and electron density difference showed the sensing mechanism of p-C 8 H 10 is mainly derived from physical adsorption–desorption in view of electron transfer. Graphic abstract For organic–inorganic hybrid perovskite (C 4 H 9 NH 3 ) 2 PbI 4 , single layer perovskite sheets of distorted PbI 6 octahedron alternated with protonated n-butylammonium cation bilayers (a), which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Electron density difference calculation shows that adsorption of p-xylene molecule has an obvious effect on the electron distribution of (C 4 H 9 NH 3 ) 2 PbI 4 , results in electrically polarization as a local manner (b).
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 6
·3120-3127
·
IF 3.591
Yixuan Huang,Liyan Xie,Kangji Zhuo,Hao Zhou,Yanhui Zhang
MIL-101(Fe)-based composite materials and their application for the generation of H2 by the catalytic reduction of nitro organics are reported in this study. NaBH4 and water contribute hydrogen for the catalytic reduction of nitro organics, but the possibility of nitro organics as a potential hydrogen source is often overlooked due to the simplicity of the reaction. However, experiments have revealed that the reaction process is accompanied by the production of H2, which is affected by the concentration of nitro organics. Moreover, the reaction is more conducive to the generation of H2 compared to NaBH4 hydrolysis under the same conditions. Unlike specially catalyzing the expensive NaBH4 hydrolysis, hydrogen is a by-product of the reduction of pollutants by inexpensive catalysts (NaBH4 acted as an electron donor for the catalyst). Accordingly, the reaction mechanism of p-nitrophenol hydride reduction was optimized. This work provides a new perspective on the application of this reaction.
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高影响因子
危险品化学品经营许可证（带存储）