APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Bi-Xian Chen,Jing Tan,Yong-Jie Yie,Su-Ru Tang,Xin Deng,Hao-Yuan Xie,Wen-Ting Liu,Xiaojun Liu,Wei-Qin Xu,Chun-Cheng Lin,Sheng-Run Zheng
The removal of toxic organic compounds from aqueous media through reduction reactions using nonnoble catalysts has attracted much attention in recent years. In this study, a simple method for the synthesis of pure-phase Ni 12 P 5 nanoparticles supported on N, P-codoped carbon (NPC) sheets was developed, in which a nickel phosphine complex was selected as the precursor due to its high Ni/P ratio, air stability and easy preparation. By controlling the pyrolysis temperature, Ni x P y @NPC 700 with a high dispersity and exposed active sites can be obtained, which was characterized by XRD, HRTEM, EDS, XPS, Raman and NH 3 -TPD. The catalytic performance of the composite in the reaction of 4-nitrophenol (4-NP) was assessed under mild conditions, exhibiting excellent catalytic activity with a low apparent activation energy E a (29.87 KJ·mol −1 ). In addition, the catalyst can be recycled without obvious loss of activity for up to ten successive cycles. The outstanding hydrogenation activity is ascribed to the exposed Ni 12 P 5 (3 1 2) crystal plane of Ni x P y @NPC 700 , which is attributed to the lower energy barrier required to form a hydrogen splitting state according to DFT calculations. Moreover, Ni x P y @NPC 700 was creatively coated in a Teflon tube with Nafion as the adhesive and constructed as a fixed-bed device. The continuous-flow catalytic reaction shows that the catalyst can maintain a satisfactory efficiency for approximately 6 h in the reduction of 4-NP and methyl orange (MO). These findings suggest that Ni x P y @NPC 700 is an ideal catalyst for industrial applications for the chemical reduction of toxic compounds from wastewater.
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高影响因子
Journal of Energy Storage
·
2023
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IF 9.4
Qiuying Zhao,Lu Yang,Yige Bie,Yuemin Du,Yizhou Ma,Jiatai Sun,Hongli Ji,Jinhao Qiu
The urgent demand of efficient power sources for microelectronics has stimulated the exploration of light-weight electrostatic capacitors with high energy density . With the distinctive characteristics of high dielectric constant and breakdown strength, Poly(vinylidene fluoride) (PVDF) based ferroelectric polymers have emerged as promising candidates for high-performance dielectric capacitors. However, the intrinsic high hysteresis loss of PVDF based polymers would largely weaken the discharge efficiency of capacitors, hindering their practical application. In this work, we demonstrate that through topological-structure design and proper doping composition modulation involving in MXene and boron nitride nanosheets (BNNS), considerable enhanced discharge efficiency and discharge energy density can be simultaneously achieved. For example, a 7 layered composite comprised of alternative BNNS reinforced layers and MXene reinforced layer presents an ultra-high discharge density and charge-discharge efficiency of 34.6 J/cm 3 and 62 %, respectively. It is anticipated that this work will open a new design paradigm to direct PVDF based ferroelectric polymers towards viable high-performance capacitors.
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高影响因子
Materials Advances
·
2022
·Vol. 3
·期 20
·7546-7558
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IF 0
Hecheng Ma,Jianjun Liu,Yimeng Wang,Shengli Zuo,Yingchun Yu,Baoshan Li
Photocatalytic degradation has been developed as a promising strategy for environmental remediation. Black phosphorus (BP) has attracted much attention in the field of photocatalysis due to the adjustable bandgap and high carrier mobility. In this work, we constructed a flower-like BP nanosheet/P-doped BiOCl (BP/P-BiOCl) S-scheme heterostructure via a simple co-precipitation method. The physicochemical properties such as the crystallinity, morphology, chemical environment, and optical and electronic properties of the as-fabricated materials were analyzed by using different analytical techniques. SEM data indicated the successful formation of a flower-like structure of BP/P-BiOCl composites. X-Ray photoelectron spectroscopy data indicated the formation of P-doped BiOCl. X-Ray diffraction and high resolution-TEM data revealed the formation of a hierarchical BP/P-BiOCl heterostructure. The catalytic activity of the as-synthesized samples (15%-BP/P-BiOCl) was tested towards RhB degradation (96% of 20 ppm RhB solution) and Cr(VI) reduction (90% of 20 ppm Cr(VI) solution) under solar light illumination. We demonstrated the formation mechanism of a flower-like structure in which positively charged BPNs assembled with negatively charged P-BiOCl by electrostatic attraction. Furthermore, we revealed the S-scheme photocatalytic mechanism to prove the enhanced photocatalytic activity of BP/P-BiOCl composites. The photodegradation of phenol, radical species trapping experiments and charge transfer route test were performed to prove the formation of the S-scheme. This work provides a facile route for the construction of a flower-like S-scheme heterostructure photocatalyst for efficient solar light photocatalytic performance.
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BIOCHEMICAL ENGINEERING JOURNAL
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2022
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IF 4.446
Qian Wei,Bowen Li,Xia Zhao,Feng Jiang,Yumin Xu,Xiaoning Jia
The feasibility and superiority of bioelectrochemical systems for the degradation of p -bromoaniline ( p -BrA) have been confirmed previously. In this research, the influences of the cathode potential and initial p -BrA concentration on the performance of microbial electrolytic cells (MECs) were investigated. The degradation performance and degradation kinetics of a MEC and a conventional anaerobic reactor (CAR) were compared to analyze degradation products. The microbial species diversity in the MECs was studied to analyze changes following the introduction of electric potential. The optimized solution had a cathode potential of 0.5 V, an initial concentration of 50 mg/L, and a pH value of 7. Under these conditions, the removal efficiency for p -BrA was 94.94 %. In addition, after transitioning from a CAR to an MEC, the bacterial species diversity of the biocathode took place significant changes. Several types of aniline-degrading bacteria, such as Proteobacteria and Patescibacteria, and methane-producing bacteria, such as Anaerolineaceae, were dominant in the community of the cathodic biofilm. Experimental results showed that the removal of p -BrA degradation products was closely related to the diversity of cathode bacteria.
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高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yu Wang,Yuxin He,Yujing Chi,Peiji Yin,Lishan Wei,Wenwen Liu,Xinyao Wang,Han Zhang,Haiyan Song
Photocatalytic H 2 O 2 production is a green and sustainable technology, which still exposes the issues of excessive dependence on organic electron donors and pure O 2 , and lacking effective use. It is necessary to develop more efficient and more economical photocatalysis system for H 2 O 2 production. Here, we construct a S-scheme p-n heterojunction from the p-type MnS and the n-type protonated g-C 3 N 4 (PCN) semiconductors for photocatalytic H 2 O 2 production and achieve the in situ use of H 2 O 2 for oxidative degradation of oxytetracycline (OTC). The PCN/MnS composite synthesized by a one-step method well maintains a nanosphere structure of α-MnS and load the PCN on the sphere surface to form a heterojunction with strong interaction. PCN/MnS exhibits the improved photogenerated charge separation and electron transfer efficiency. An optimal photocatalyst can produce 669.6 μM of H 2 O 2 for 6 h without using the electron donors and the pure O 2 gas. The mechanism proposed the contribution of a S-scheme p-n heterojunction forms between PCN and MnS. The electrons in conduction band (CB) of MnS are responsible for the major single-electron reduction of •O 2 - radicals and the auxiliary two-electron reduction of O 2 for H 2 O 2 production, while the holes in valence band (VB) of PCN further promote the separation of photocarriers. The photogenerated H 2 O 2 can be effectively used as an in-situ oxidant to achieve 82.2% degradation of OTC in water within 80 min. The •O 2 - radicals which originate from the in situ decomposition of H 2 O 2 over PCN/MnS mainly contribute to the OTC oxidation .
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MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Mingwen Wang,Lei Cao,Zhenhuan Li,Kunmei Su
Development of carbon-based oxygen reduction reaction (ORR) catalysts with performance superior to noble metals across a wide pH range has been a formidable challenge. Herein, porous hollow carbon spheres co-doped with N, P (NH 3 -NPCS-900) is directly synthesized from the herbal residues of Lasiosphaera seu Calvatia (LSC). Critically, the N content was significantly enhanced in the presence of ammonia (NH 3 ) and formed a hierarchical porous structure and a large specific surface area (984.7 m 2 g −1 ). With the synergistic effect of these contributions, the NH 3 -NPCS-900 catalyst exhibit excellent ORR catalytic activity across acidic (E 1/2 = 0.615 V) and alkaline solutions (E 1/2 = 0.862 V). Zn-air batteries with NH 3 -NPCS-900 exhibit high peak power density (188 mW cm −2 ) and better cycle durability (>180 h), showing its potential and promise in applications. This study provides valuable direction and insight into how to develop porous carbon with highly efficient ORR catalytic activity from biomass.
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高影响因子
Materials Today Chemistry
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2021
·
IF 8.301
A. El Jaouhari,A. Slassi,B. Zhang,W. Liu,D. Cornil,J. Zhu,X. Wu,D. Zhou,X. Liu
Among the two half-reactions of the electrochemical water splitting, the anodic oxygen evolution reaction (OER) is a kinetically sluggish process and usually requires noble metal oxide catalysts. Therefore, the development of highly active, noble metal-free, and durable catalysts for OER is an urgent need for sustainable applications. The encapsulation of transition-metal alloyed nanoparticles in graphitic carbon layers, with core-shell features, is a viable approach for establishing an undegradable and highly efficient catalyst toward OER. Furthermore, the reactivity of the carbon shell surface can be further improved by the electron transfers between the core alloy and carbon shell, through a control of the alloyed nanoparticle compositions, or through a chemical doping. Nevertheless, it is still not clear whether the incorporation of a chemical dopant directly into the carbon shells systematically promotes the catalytic activities toward OER. To clarify this point, we synthetize trimetallic (CoNiFe) nanoparticles encapsulated in graphitic carbon shells by pyrolysis of metal−organic frameworks. We then investigate the effect of a doped graphitic carbon shell by incorporating non-metallic elements such as sulfur, phosphorus, and selenium. The main finding is that all doped CoNiFe@C core-shell catalysts exhibit an enhanced catalytic activity toward OER in the alkaline electrolyte with a low overpotential, a small Tafel slope, and long stability, which are all being comparable to those of RuO 2 benchmark. Electrochemical impedance spectroscopy , X-ray photoelectron spectroscopic, and Raman measurements collected at different applied potentials during the OER process indicate that the doping of graphitic carbon shell significantly improves the interfacial electron-transfer kinetics and facilitates the adsorption of OH − ion as well as promotes the formation of metal oxyhydroxide, which positively affect the OER performances. Moreover, this improvement in OER efficiency upon incorporating of a chemical doping is rationalized by the optimization of the Gibbs free energy of OER intermediates, thereby remarkably reducing the required energy input of rate-determining step, as elucidated by the density functional theory calculations.
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Coatings
·
2023
·Vol. 14
·期 1
·28
·
IF 3.4
Yaling Deng,Yu Xu,Lei Nie,Yiyang Huang
The development of coatings with efficient lubrication and load-bearing capacity is an urgent need for artificial joints. Here, we successfully fabricated poly (acrylic acid-co-acrylamide)/polyethyleneimine (P(AA-co-AAm)/PEI) coating on titanium alloy (Ti6Al4V) surface via UV irradiation and thermal treatment technique. The dual crosslinked network structures were composed of a P(AA-co-AAm) network via free radical polymerization and a PAA-co-PEI network via thermal crosslinking of amine and carboxyl groups. The thermally crosslinked P(AA-co-AAm)/PEI coatings exhibit a stable low friction coefficient (approximately 0.022) and exceptionally low wear volume, with a 93.8% and 92.6% reduction, respectively, in comparison to the pristine Ti6Al4V. These thermally crosslinked P(AA-co-AAm)/PEI hydrogel coatings exhibit excellent lubrication and anti-wear properties, providing a strategy for developing novel lubricating coatings in the biomedical field.
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高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Chengduan Wang,Wan Gou,Changlu Liu,Dong Fu,Lvshan Zhou,Chuan Lai,Bin Xie,Shasha Zhu
The new corrosion inhibitor of S-benzyl-O,O'-bis( p -tert-butyl phenyl)dithiophosphate (SOBP) was synthesized and characterized by elemental analysis, FT-IR, 1 H NMR, 13 C NMR, 31 P NMR and single crystal X-ray diffraction. Meanwhile, the corrosion inhibition and mechanism of SOBP for Q235 steel in 1.0 M HCl were studied by weight loss and potentiodynamic polarization measurement, also the crystal structure of corrosion inhibitor was presented. The potentiodynamic polarization measurement result indicates that SOBP is a mixed-type inhibitor. The two methods all reveal that the inhibition efficiency increases with the concentration of SOBP, which is an effective corrosion inhibitor. The adsorption of SOBP on Q235 steel surface in 1.0 M HCl belongs both physisorption and chemisorption.
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高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
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2021
·
IF 6.514
Jingjing Zhou,Lishi Zhang,Yuhang He,Kexin Liu,Fangfang Zhang,Hanru Zhang,Yaqi Lu,Changyan Yang,Zhaopeng Wang,Muhammad Subaan Fareed,Xiaolei Liang,Wenjin Yan,Kairong Wang
Due to the threat of escalating multi-drug resistant gram-negative bacteria to human health and life, novel antimicrobial agents against gram-negative pathogens are urgently needed. As antimicrobial peptides are not prone to induce bacteria resistance , they are believed to be one kind of promising class of potential antimicrobial agent candidates to combat multi-drug resistant bacteria for long-term use. Jelleine-1, first isolated from the royal jelly of honeybees, is a typical amphiphilic antimicrobial peptide and shows broad antimicrobial spectrum and negligible toxicity. To promote its antimicrobial activity and extend its potential of clinical use against multi-drug resistant gram-negative bacteria, novel analogs of jelleine-1 were designed, synthesized and their antimicrobial functions and toxicity were examined in this study. Our results showed that fine tuning of the cationic charge, polarity, and basicity of the sequence through amino acids substitution at position 3, 5, 7 and maintaining position 1, 4, 6, 8 unchanged could improve the bioactivity of jelleine-1 significantly. Meanwhile, we also found that the substitution of phenylalanine by tryptophan also could improve the antimicrobial activity of jelleine-1. Among all the analogs, analog 15, which is enriched in arginine and leucine , showed the most potent antimicrobial activity against both gram-negative and gram-positive bacteria, especially to multi-drug resistant Pseudomonas aeruginosa in vivo and in vitro . In addition, analog 15 also showed potent inhibition of the formation of multi-drug resistant P. aeruginosa biofilm and negligible toxicity, which was certified by MTT , hemolysis, blood assay, and biochemical analysis .
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PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2023
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IF 5.1
Wei Zhang,Bingtao Wang,Yan Xia,Wei Wang,Zhenghong Guo,Zhengping Fang,Juan Li
It is a great challenge to prepare polyamide 6 (PA6) compounds with outstanding fire safety and mechanical properties. In this research, a flame retardant containing P/N/S elements (SNDP) was synthesized using 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 2-thiophene-carboxaldehyde and 4-aminobenzonitrile. The PA6/SNDP compounds were prepared using a melt blending method. Two chain extenders were incorporated into PA6/SNDP compounds to adjust their mechanical properties. The results suggest that PA6 compound with 10 wt% SNDP obtains a UL-94 V-0 rating (1.6 mm) and a limiting oxygen index (LOI) value of 27.4 vol%. SNDP induces the degradation of PA6 and decreases its mechanical properties. While the two chain extenders have reinforced effects on PA6/SNDP and this effect of 1,3-phenylene-bis-oxazoline is superior to another one. Moreover, the main flame-retardant mode of actions for SNDP in PA6 is gas-phase effect, including scavenging free radicals and diluting flammable gases.
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高影响因子
FIRE SAFETY JOURNAL
·
2021
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IF 2.764
Liping Chen,Qing Jiang,Zhonglin Luo,Biaobing Wang
It is still a great challenge to develop flame-retardant epoxy resins (EP) with high transparency. Herein, a reactive P/N/S-containing compound (DOPT) was designed and synthesized by the Atherton-Todd reaction between p -toluenesulfonamide and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. The addition of DOPT simultaneously improved the flame retardancy , fire safety and mechanical strength meanwhile kept the better transparency of the EP At 5 wt% DOPT loading, the modified EP (FREP-5) achieved a LOI value of 37.5% and UL-94 V-0 rating, with maintaining almost the same transmittance of the pure EP. Meanwhile, the FREP-5 also gave the lowest values of the peak heat release rate , total heat release, total smoke production and fire growth rate, revealing the enhanced fire safety of the flame-retardant EP. The significant improvement of flame retardancy of FREP thermosets was ascribed to the physical barrier effect of phosphorus-rich char in condensed phase, and the quenching and diluting effects of abundant phosphorus-containing free radicals and nitrogen/sulfur-containing inert gases in gaseous phase . Furthermore, the results of dynamical mechanical analysis and mechanical performance test revealed that the incorporation of DOPT improved the tensile and flexural strength of epoxy thermoset. In summary, DOPT is a novel highly efficient flame retardant for EP, which enables EP to maintain its potential application in the optical fields .
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