CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Zhen He,Yu Zhou,Yuxin Wang,Pingyi Guo,Wensen Jiang,Caizhen Yao,Xin Shu
Several Ni-W-P-TiO 2 nanocomposite coatings were developed by the sol-enhanced electroplating method. The phase and elemental compositions of coatings were determined, and the surface and cross-section morphology were characterized. The mechanical and corrosion performance were systematically tested. The results revealed the addition of 5 ml·L −1 TiO 2 sol caused a compact coating surface, while higher concentrations of TiO 2 reduced the coating thickness and led to the inferior surface microstructure. The comparison in physiochemical properties of prepared coatings confirmed the superior performance of the Ni-W-P-TiO 2 nanocomposite coating at 5 ml·L −1 TiO 2 sol addition. Under this condition, the best mechanical properties were achieved when abrasive wear was the dominating wear-resistance mechanism, and the best corrosion resistance was obtained due to its smooth and compact surface microstructure.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiaojuan Li,Lanmei Ye,Ziyu Ye,Shuhan Xie,Yueming Qiu,Fengzhen Liao,Chunxiang Lin,Minghua Liu
A nitrogen and phosphorus co-doped metal-free porous carbon (NPC) with core/shell structure was successfully synthesized by pyrolysis of ZIF-8@phytic acid (PA) and demonstrated outstanding catalytic performance on PMS activation for the degradation of phenol (98.0% within 30 min at pH = 7.0). Results suggested that optimized N-P co-doping strategy played a synergistic effect in promoting the catalytic activity of NPC. In addition, NPC displayed excellent acid-base tolerance (pH = 3.0–10.0) and insensitive to anions (Cl − , HCO 3 – and H 2 PO 4 − ) and humic acid when employed as PMS activator for phenol degradation. Based on quenching tests, electron paramagnetic resonance (EPR) measurements and electrochemical analysis, singlet oxygen ( 1 O 2 ) is the key active specie and the surface-bound sulfate radical (SO 4 − ) plays an auxiliary role in the removal of phenol in NPC/PMS system while surface electron transfer is also a non-radical pathway. Large BET specific surface areas (SSA), total pore volumes (TPV) and hierarchical porous structure are beneficial to expose more active sites (essentially graphite N and C O) for generating 1 O 2 and surface-bound SO 4 − to enhance catalytic performance of NPC. This work opens up a new way for the synthesis of highly efficient N-P co-doped metal-free PMS activators and provides novel insights into the mechanism of PMS activation by NPC.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·85
·
IF 3.426
Qilong Zhang,Zhao Zhang,Nuoxin Xu,Hui Yang
Nanocomposites containing inorganic fillers embedded in polymer matrices have exhibited great potential applications in capacitors. Therefore, an effective method to improve the dielectric properties of polymer is to design novel fillers with a special microstructure. In this work, a combination of hydrothermal method and precipitation method was used to synthesize in situ SnO2nanoparticles on the surface of one-dimensional TiO2nanowires (TiO2NWs), and the TiO2NWs@SnO2fillers well-dispersed into the poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] polymer. Hybrid structure TiO2NWs @SnO2introduce extra interfaces, which enhance the interfacial polarization and the dielectric constant. Typically, at 10 vol.% low filling volume fraction, the composite with TiO2NWs @SnO2shows a dielectric constant of 133.4 at 100 Hz, which is almost four times that of polymer. Besides, the TiO2NWs prevents the direct contact of SnO2with each other in the polymer matrix, so the composites still maintain good insulation performance. All the improved performance indicates these composites can be widely useful in electronic devices.Keywords:hybrid structure;composites;interfacial polarization;dielectric performances
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高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 10
·2534-2541
·
IF 2.799
Zhang Chenjun,Lu Dan,Jiang Pingping,Li Jingjing,Leng Yan
Abstract A novel porous cross-linked chitosan polymer was prepared by Schiff reaction of chitosan (CS) with terephthalic aldehyde (TPA), followed by modification with trimethoxysilylpropanethiol. Such functional CS polymer (CS-TPA) could serve as both support and stabilizer for homogeneous palladium (Pd 2+ ) catalyst. The obtained heterogeneous catalyst (Pd/CS-TPA-SH) exhibited high catalytic activity and selectivity for the oxidative Heck reaction of benzene and ethyl acrylate. The excellent performance is mostly attributed to the –SH groups stabilized Pd 2+ species. Furthermore, Pd/CS-TPA-SH can also be used as the catalyst for the reduction of p-nitrophenol at room temperature, showing high efficiency and steady reusability. Graphical Abstract A novel thiol functionalized cross-linked chitosan polymer supporting palladium is synthesized and proved to be a highly efficient catalyst for oxidative Heck reaction and nitrophenol reduction.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiang Zhou,Xiaohao Liu,Fenglei Qi,Haixia Shi,Ying Zhang,Peiyong Ma
P-doped mesoporous carbon material is receiving increasing attention in various fields due to its special physicochemical properties, but the research in the field of pollutant removal is rarely reported. Herein, P-doped furfural residue-based carbon materials (PFRC) with ultra-high mesoporous ratio (93.9%), narrow pore size distribution and large surface area (1769.4 m 2 g −1 ) was prepared by a simple method of fast pyrolysis of phosphoric acid treated furfural residue (FR). A series of characterizations were carried out to explore the physicochemical properties and P-doping mechanism of the materials systematically. With the increase of the activation temperature, the evolution of the P-doped structure is as follows: adsorbed phosphate → P-O-C aromatic → O3P-C aromatic → O2P-C2 aromatic → OP-C3 aromatic . The PFRC500 prepared at 500 °C has the most abundant P-O-C aromatic and P-C aromatic structures, which lead to a higher specific surface area, more developed pore structure and more graphite edge defects than other PFRCs. Methylene blue (MB) adsorption studies showed that PFRC500 had a good adsorption performance with 486 mg g −1 equilibrium adsorption capacity and 97.2% of removal rate (T = 298 K, C 0 = 100 mg L −1 ). The adsorption kinetics and thermodynamics were studied. The role of P structure in MB adsorption was explored for the first time. the adsorption mechanism was explored. The P-O-C aromatic , O3P-C aromatic and O2P-C2 aromatic structures are the main chemical adsorption sites, but C3 aromatic -PO is not. This work can provide guidance for the design of P-doped mesoporous carbon materials with better adsorption performance in the future.
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高影响因子
CORROSION
·
2023
·Vol. 79
·期 5
·486-496
·
IF 1.6
Zhao Yinghai,Li Wei,Wang Zhenwen,Li Ning,Xu Yanling,Li Deyu
In recent years, in the field of tinplate production, it has become a trend to use lower tin coating mass to lower production costs. However, the preparation of low Sn-coated steel must face two significant problems: toxic chromate post-treatment and low corrosion resistance. In this work, we developed an Mn-Al-P chemical conversion coating using a process sequence-adjusted tinplate of 0.5 g/m 2 tin coating mass as an alternative to the chromate treatment. Meanwhile, by adjusting the subsequence of the reflowing process and the post-treatment process, the wash water and electricity consumption were effectively reduced. The influence of reflowing time on the microstructural appearance, phase composition, surface element distribution, and corrosion resistance of this new brand tinplate was studied. Moreover, the composition was determined by x-ray photoelectron spectroscopy, and further discuss the formation mechanism of this coating. The results show that this mutielement coating could effectively fill tin-free zones on the surface of the tinplate and improve the corrosion resistance when the reflowing time is properly set up to 3.5 s after the process adjustment. However, continually extending the reflowing time would cause the phosphate coating to fall off, leading to the corrosion resistance deterioration. The coating was mainly made up of a series of amorphous phosphate compounds and metal oxides, which was suitable for a tinplate with low tin coating mass.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yongpeng Li,Da Lei,Tianyi Jiang,Junling Guo,Xiaoyu Deng,Xu Zhang,Ce Hao,Fengxiang Zhang
Co 9 S 8 can catalyze polysulfides conversion in Lithium sulfur batteries (LSBs) owing to its metallic nature and rich catalytic sites. However, its catalytic activity and chemical adsorption is not strong enough to suppress the shuttle effect of Lithium polysulfides (LiPS) under high sulfur loading. Herein, Phosphorous (P)-doped Co 9 S 8 nanoparticle was synthesized and embedded into 3D Spongy carbon (SC) sheets as electrochemical catalyst for LSBs. Our Density functional theory (DFT) calculations and experimental results revealed that moderate P doping can modulate the electronic structure of Co 9 S 8 and simultaneously improve its interaction with LiPS and promote LiPS conversion. When P-doped Co 9 S 8 nanoparticles are in situ formed and homogeneously distributed on 3D spongy carbon sheet matrix, the resulting P-Co 9 S 8 @SC can ensure good exposure of their adsorption and catalytic sites. As a result, the LSB based on an optimized P-Co 9 S 8 @SC modified polypropylene separator exhibited excellent cycling stability (capacity decay of 0.05% per cycle over 900 cycles at 1 C) and high areal capacity (4.38 mAh cm −2 at 5.6 mg cm −2 sulfur loading at 0.1 C). Our work demonstrates that moderate heteroatom doping is a promising strategy to develop effective polysulfides catalysis.
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高影响因子
Science of Advanced Materials
·
2021
·Vol. 13
·期 12
·2450-2459
·
IF 1.474
Tan Xin,Zheng Zhijie,Peng Bo,Wu Xiaogang,Huang Xiangyang,Chen Xiaofei
Ti/RuO2–IrO2 electrode was used in this study as an anode, while titanium plate (Ti) was used as a cathode for electrochemical oxidation process, to explore the influences of related parameters on degradation of p-nitrophenol (PNP) and removal of Cu2+
from mixed simulated wastewater. Using a single chamber reactor, we tested the influence of various factors on the PNP degradation and Cu2+ elimination. The factors that were tested are as follow; the type of electrolyte, density of the current, various values of pH and different
concentrations of Cu2+. Furthermore, a dual-chamber diaphragm reactor compartmentalized by cationic membrane was utilized to explore the removal mechanism of PNP and Cu2+. Results showed that, treatment of PNP-Cu2+ simulated wastewater, with NaCl as electrolyte,
had a better effect compared with Na2SO4, which had characteristics such as shorter reaction time and higher degradation efficiency for PNP. Removal of Cu2+ had no obvious advantage over Na2SO4. The degradation of PNP and removal of Cu2+
were improved with increased current density when the rang was increased from 10 to 40 mA/cm2. Cu2+ concentration when increased initially promoted the degradation of PNP. At the same time, Cu2+ acted as electron acceptor at the cathode that slowed down the
consumption of H+ through reduced combination of H+ with electrons. The degradation rate of PNP decreased with increased initial pH, but the Cu2+ was opposite. In this experiment, the degradation of PNP was positively correlated with indirect oxidation of active
chlorine, and the Cu2+ was removed by cathodic electrodeposition.
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高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 42
·6374-6381
·
IF 3.382
Jinyue Yang,Baohong Hong,Na Wang,Xin Li,Xin Huang,Ying Bao,Chuang Xie,Hongxun Hao
To gain further insights into the formation of cocrystals, the thermodynamic mechanism and molecular recognition process of cocrystal formation were investigated by using p-hydroxybenzoic (PHBA) as the model compound. One new 1 : 1 (molar ratio) cocrystal of p-hydroxybenzoic (PHBA) and glutaric acid (GA) was successfully synthesized via several methods, including liquid-assisted grinding, cooling crystallization, and slurry conversion crystallization. The prepared cocrystal powder was characterized by PXRD, DSC and Raman spectroscopy. The crystal structure of the cocrystal was determined and interpreted by single-crystal XRD. The ternary phase diagrams of the newly prepared cocrystal were constructed in acetonitrile at three temperatures, i.e., 2, 20 and 40 °C. The temperature was shown to have an impact on the shape of the ternary phase diagrams. Guided by the determined ternary phase diagrams, the pure PHBA–GA cocrystal could be prepared successfully by isothermal slurry conversion crystallization. Raman spectroscopy was employed to monitor the molecular recognition and self-assembly process of the conversion in situ. In addition, density functional theory calculations were conducted to determine the stability and interaction energy of the cocrystal, rationalizing the formation potential of the PHBA–GA cocrystal.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yulei Sui,Bingjue Wang,Zhihao Shi,Xiaoping Zhang,Xiang Gao,Shengkui Zhong,Yu Xia,Ling Wu
With the proposal of carbon peaking and carbon neutrality goals, clean energy storage is attracting more and more attentions. In view of the lack of lithium resource in our earth, sodium-ion batteries are considered as the emerging and promising next-generation energy storage devices. Appropriate high-performance anode materials play a vital role in the development of sodium-ion batteries. Here, a core-shell hollow Ni-Co-P nanopolyhedron interconnected by oxygen defect TiO 2 (Ni-Co-P@TiO 2- x ) is reported, which is synthesized by ion etching-hydrolysis and subsequent phosphatization/hydrogenation treatment using ZIF-67 as template and hybrid carbon source. The achieved Ni-Co-P@TiO 2- x material has several distinct advantages including hollow core-shell structure, flexible conductive carbon matrix, stable electroactive coating layer, and efficient pseudocapacitive behavior, resulting in high reversible capacities, remarkable rate capability and excellent cycle stability. The synergetic battery-capacitor characteristic of Ni-Co-P@TiO 2- x material makes it become a promising anode for sodium-ion batteries.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 24
·245702
·
IF 3.551
Yongfei Cui,Huanhuan Sun,Peng Guo
Strontium titanate (SrTiO3) with perovskite structure has recently received significant attention in t he area of photocatalysis. However, challenges remain relating to its industrial applications; the high charge carrier recombination rate and low light-harvesting efficiency being the main two. Herein, a novel strategy based on fabrication of a typical n-p heterojunction has been proposed and the typical narrow-bandgap p-type semiconductor Ag2O was chosen to be coupled with SrTiO3 using a facile chemical precipitation method. The phase compositions, microstructures and optical properties of the prepared SrTiO3/Ag2O heterostructured photocatalysts have been systematically investigated with an x-ray diffractometer, scanning electron microscope, high resolution transmission electron microscope, x-ray photoelectron spectroscope and UV–vis spectrophotometer. The photocatalytic properties were evaluated through photodegradation of a common organic dye Rhodamine B (RhB). The results demonstrated that the heterostructured photocatalyst SrTiO3/Ag2O-0.15 outperformed pristine SrTiO3 and Ag2O. Specifically, the reaction rate of SrTiO3/Ag2O-0.15 is about 69 times and 4 times that of bare SrTiO3 and Ag2O respectively in photodegradation of RhB. The excellent photocatalytic performance was attributed to the synergetic effect between the improved visible-light harvesting efficiency and inhibited electron–hole recombination rate arising from the built-in electric field in a p-n heterojunction, as evidenced by the transient photocurrent and photoluminescence spectrum investigation. Furthermore, the excellent recyclability of the heterostructured photocatalyst was confirmed and holes were verified to be the major active species contributing to the overall degradation. Our findings demonstrate construction of p-n heterojunctions with narrow-bandgap semiconductors as a feasible avenue to promote overall photocatalytic efficiency, through simultaneously boosting charge-carrier separation and expanding photon-absorption range.
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高影响因子
iScience
·
2024
·Vol. 27
·期 2
·108818-108818
·
IF 4.6
Manlu Zhu,Haoyan Mu,Xiongfeng Dai
To thrive in nature, bacteria have to reproduce efficiently under favorable conditions and persist during stress. The global strategy that integrates the growth control and stress response remains to be explored. Here, we find that a moderate induction of (p)ppGpp reduces growth rate but significantly enhances the stress tolerance of E. coli , resulting from a global resource re-allocation from ribosome synthesis to the synthesis of stress-responsive proteins. Strikingly, the activation of stress response by (p)ppGpp is still largely retained in the absence of RpoS. In addition, (p)ppGpp induction could activate the catabolism of alanine and arginine, facilitating the adaption of bacteria to nutrient downshift. Our work demonstrates that the activation of stress response by (p)ppGpp could occur in an RpoS-independent manner and (p)ppGpp enables bacteria to integrate the control of growth and stress response in a seesaw fashion, thus acting as an important global regulator of the bacterial fitness landscape.
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高影响因子
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