COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yuanjie Xu,Shichao Yang,Meihui Ying,Xing Lin,Haibo Pan
Metal-organic frameworks (MOFs) are with extensive attention for environmental remediation due to their various modification and high density of active sites. Herein, a series of Ag/ZnO@ZIF-C with core-shell structure and graphene carbon (C) acts as a sandwich bridge were designed as a photocatalyst , accelerating the interfacial charge transfer rate between Ag and ZnO. Photocatalytic activities of Ag/ZnO@ZIF-C is remarkably improved toward rhodamine B (RhB) under UV irradiation , i.e., the degradation rate by Ag/ZnO@ZIF-C (20 wt%) is 2.27 times than that of P25. RhB molecules were simultaneously photodegraded at multiple sites, including N-site de-ethyl, conjugate structure and benzene ring . The photocatalytic upgrading performance was recognized to the synergetic interface between ZnO@ZIF-C and Ag nanoparticles (NPs) with effective separation and suppressed the recombination of electrons and holes. It is suggesting that the electrons in the valence band (VB) of ZnO are excited to the conduction band (CB) and transferred to Ag NPs through the ZIF-C layer, then react with adsorbed oxygen to create superoxide radicals and degrade RhB into small molecules. After a five-consecutive operation, its photocatalytic efficiency by Ag/ZnO@ZIF-C (20 wt%) still maintains at 95.11 %. This work provides a promising method for the rational design of high-performance carbon doped photocatalysts for environmental remediation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Meng Cheng,Junhao Liu,Hao Jiang,Chunling Li,Shuangqing Sun,Songqing Hu
In view of the critical importance of oxygen to corrosion evolution, to starve corrosion via depleting oxygen in coatings is a promising strategy. In this work, a novel nanocatalytic anticorrosion concept is proposed to design new coating with outstanding corrosion resistance . Different from the passive barrier of traditional coatings and self-repair after corrosion of current stimuli-feedback coatings, such coating could spontaneously eliminate internal diffused oxygen and greatly suppress the corrosion process. As a proof of concept, single-atom Fe-N-C electrocatalyst with isolated FeN 4 active sites is synthesized by a simple confined carbonization method, exhibiting excellent oxygen reduction performance (E 1/2 = 0.902 V). In composite coating , the evenly dispersed Fe-N-C compensates for the coating defects and serves as oxygen scavengers, which could actively adsorb and consume ambient oxygen, thereby preventing oxygen penetration to the metal substrate surface, eliminating the oxygen contribution to corrosion and significantly boosting the anticorrosion performance of epoxy coating. This in-situ mediation for oxygen in coating prevents metal substrate from receiving new supply of oxygen, while imparting active anticorrosion property to the coating.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Shuang Liang,Guanting He,Guozhe Sui,Jinlong Li,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Chao Wang,Zhiyong Xing
Metal organic frameworks (MOFs) are considered as desirable precursors for the preparation of photocatalyst to improve photocatalytic hydrogen evolution efficiency due to the maintained special morphology. Herein, C-doped rod-like ZnO with porous structure has been successfully prepared by using ZIF-L as precursor via an optimized two-step calcination strategy, which is applied for photocatalytic hydrogen evolution reaction from water splitting. The results show that ZnO-350-450 exhibits the best photocatalytic activity with a hydrogen production rate of 0.35 mmol·g −1 ·h −1 , which is 1.9 times higher than that of ZnO-400 (0.184 mmol·g −1 ·h −1 ) under simulated sunlight illumination. The enhanced photocatalytic performance is attributed to the fact that the two-step calcination provides the regular porous rod-like structure (ZIF-L) and the inclusion of carbon in ZnO photocatalyst. C-doped ZnO with regular morphology offers faster charge transfer rate and higher charge separation efficiency, and the C-doped expands a wider range of light absorption. Overall, the presented work could provide a new idea for designing and preparing of photocatalysts with high efficiency for photocatalytic hydrogen production.
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Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 1
·13-22
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IF 1.8
Tian Lu,He Jie-Xin,Huang Xin-Yang,Feng Yang,Lu Yue-Wen,Wang Rui-Hao,Wang Qian,Guo Chang-Ping
Herein, nano-Co 3 O 4 /C composite catalyst was successfully synthesized by calcination of cobalt alginate (CA) film, which was prepared by ion exchange method. The morphology and structure of the films and calcined samples were characterized. It was found that the thickness of the film produced by Co 2+ substituted Na + was 20 μm, and the surface and side of the film were smooth and uniform. After the calcination of CA film at 400 °C, Co 3 O 4 nanoparticles grown in situ were loaded onto the carbonized alginate skeleton. The results of the thermal analysis showed that the higher the content of catalyst, the more obvious the catalytic effect on AP. Compared with pure AP, the exothermic peak temperature with 3 wt% nano-Co 3 O 4 /C composite catalysts decreased by 103.1 °C, demonstrating the catalytic effect on the nano-Co 3 O 4 /C. The nanocomposite catalyst could be synthesized quickly and in large quantities in this way, which had certain theoretical and practical value for improving the combustion behavior of AP-based composite solid propellants. Graphical abstract Based on inspiring by biomaterial, we have designed and prepared a nano-Co 3 O 4 /C composite catalyst by a facile ionic crosslinking solidification method, which effectively enhanced the thermal decomposition of the ammonium perchlorate.
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DALTON TRANSACTIONS
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2023
·Vol. 52
·期 9
·2887-2897
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IF 4
Zhifeng He,Xin Cui,Guangping Lei,Zeyi Liu,Xiaoyang Yang,Yifu Liu,Jiafeng Wan,Fangwei Ma
Molybdenum (Mo) is one of the most important constituent elements in natural nitrogenase and theoretical calculation results show that Mo-based materials can be used as potential NRR electrocatalysts. The design of advanced catalysts with a special structure is very essential for promoting the development of electrocatalytic N2 into NH3. In this paper, Fe-doped MoO2/C heterostructured nanoparticles with rich oxygen vacancies (Vo) are designed and they exhibit highly efficient catalytic activity for artificial N2 fixation in neutral electrolytes under ambient conditions. The influence of the atomic ratio of the Fe source to the Mo source and the NaBH4 ethanol solution treatment on the structure and electrocatalytic performance are systematically investigated. The Vo-Fe–MoO2/C (1 : 50) catalyst with rich oxygen vacancies shows a satisfactory electrocatalytic N2 reduction reaction (e-NRR) activity in 0.1 M Na2SO4 with a high ammonia yield rate of 15.87 ± 0.3 μg h−1 mg−1 at −0.5 V versus the reversible hydrogen electrode (vs. the RHE) and a FE of 13.4% at −0.3 V (vs. the RHE). According to the results of DFT calculations, the active center of the electro-catalytic nitrogen reduction reaction is the molybdenum atom between the iron atom and the O vacancy. Oxygen vacancies can not only reduce the energy barrier of the RDS but also facilitate the desorption of ammonia and the first step hydrogenation of nitrogen. The doping of Fe will change the electronic state of the Mo atom in MoO2.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Kun Zhou,Wei Liu,Peifang Wang,Juan Chen,Huinan Che,Bin Liu,Yanhui Ao
Rational design of piezo-assisted photocatalytic systems for simultaneously efficient ultilization of solar and mechanical energy is promising but still challenging. In this work, a novel Bi 4 Ti 3 O 12 @C (BTO@C) Schottky heterojunction with high piezo-assisted photocatalytic performance is rationaly designed, and the degradation reaction rate constant k for RhB reaches 0.092 min −1 in 30 min. Experimental results and density functional theory (DFT) calculations show that C-layer is tightly coated on the surface of BTO. Furthermore, C-O covalent bonds , which act as electron transfer channels, are formed at the interface of BTO and C-layer. Meanwhile, the presence of piezoelectric potential field of BTO@C under piezo-assisted photocatalytic conditions further promotes the transfer of photogenerated electrons from BTO to C-layer, which synergistically contributes to the performance enhancement. This work provides a new idea for the design and development of efficient piezo-assisted photocatalytic materials.
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TRIBOLOGY INTERNATIONAL
·
2023
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IF 6.2
Hongming Wei,Gangwen Feng,Xiaoya Li,Wenyi Zhan,Feiyang Li,Yanzhang Dai,Jianpeng Zou
Cu/graphite composites are widely used in various fields as friction materials . However, their tribological properties are limited by the inadequate wettability between Cu and graphite and the insufficient strength of the Cu matrix. To strengthen Cu/graphite composites and improve their interface bonding, this investigation employed Cr 2 AlC to modify Cu/graphite composites fabricated by spark plasma sintering (SPS). The microstructure, interface characteristics, and tribological properties of the composites were thoroughly examined. The results show that the composites exhibit favorable tribological properties, which improved with the increase in sintering temperature . Specifically, as the sintering temperature increases from 800 °C to 980 °C, the friction coefficient of the composites decreases from 0.170 to 0.138, while the wear rate decreases from 9.92 × 10 −7 mm 3 /N·m to 1.86 × 10 −7 mm 3 /N·m.
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JOURNAL OF INORGANIC BIOCHEMISTRY
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2023
·
IF 3.9
Yan-Yan Li,Shuang-Shuang Long,Lu Yu,Ao-Kun Liu,Shu-Qin Gao,Xiangshi Tan,Ying-Wu Lin
The sequence and structure of human cytochrome c ( h Cyt c ) exhibit evolutionary conservations, with only a limited number of naturally occurring mutations in humans. Herein, we investigated the effects of the naturally occurring S47F/A mutations on the structure and function of h Cyt c in the oxidized form. Although the naturally occurring S47F/A mutations did not largely alter the protein structure, the S47F and S47A variants exhibited a small fraction of high-spin species. Kinetic studies showed that the peroxidase activity of the variants was enhanced by ∼2.5-fold under neutral pH conditions, as well as for the rate in reaction with H 2 O 2 , when compared to those of wild-type h Cyt c . In addition, we evaluated the interaction between h Cyt c and human neuroglobin ( h Ngb) by isothermal titration calorimetry (ITC) studies, which revealed that the binding constant was reduced by ∼8-fold as result of the mutation of the hydrophilic Ser to the hydrophobic Phe/Ala. These findings provide valuable insights into the role of Ser47 in Ω-loop C in sustaining the structure and function of h Cyt c .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuxin Liu,Yiqiang He,Chunguang Li,Zhan Shi,Shouhua Feng
Photocatalytic technology is considered a sound solution to exploit hydrogen energy. Currently, photocatalytic hydrogen production and organic synthesis under simulated sunlight simultaneously have enormous practical significance. Herein, we synthesized Ni@C metal nanoparticles cocatalyst to form a composite photocatalyst with Indium-vacancy-rich In 2 S 3 by the electrostatic self-assembly method. The composite exhibited a hydrogen production rate of 3.52 mmol·g −1 ·h −1 and coupling of benzylamine 8.37 mmol·g −1 ·h −1 . X-ray photoelectron spectroscopy and density functional theory explored the reaction process and mechanism. The charge density difference of the heterojunction surface revealed that the Ni@C interacted with the substrate via both electrostatic interaction and chemical bonds. This confirmed that the electrons rapidly transferred to the cocatalyst under the irradiation of visible light, which was conducive to the surface reduction reaction and greatly inhibited the photogenerated carrier recombination. Moreover, hydrogen adsorption energy further explained the synergistic effect of co-modification of the defect and the fact that noble-metal-free cocatalyst could improve photocatalytic efficiency. This work offers insights into the preparation of new types of photocatalysts which produce hydrogen and high-value chemicals in the future.
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Materials
·
2023
·Vol. 16
·期 14
·5137
·
IF 3.4
Yanling Jin,Jiayi Wang,Xin Gao,Fang Ren,Zhengyan Chen,Zhenfeng Sun,Penggang Ren
Titanium dioxide (TiO2) is an ideal photocatalyst candidate due to its high activity, low toxicity and cost, and high chemical stability. However, its practical application in photocatalysis is seriously hindered by the wide band gap energy of TiO2and the prone recombination of electron-hole pairs. In this study, C, N doped TiO2were supported on spent coffee grounds-derived carbon (ACG) via in situ formation, which was denoted as C, N–TiO2@ACG. The obtained C, N–TiO2@ACG exhibits increased light absorption efficiency with the band gap energy decreasing from 3.31 eV of TiO2to 2.34 eV, a higher specific surface area of 145.8 m2/g, and reduced recombination rates attributed to the synergistic effect of a spent coffee grounds-derived carbon substrate and C, N doping. Consequently, the optimal 1:1 C, N–TiO2@ACG delivers considerable photocatalytic activity with degradation efficiencies for methylene blue (MB) reaching 96.9% within 45 min, as well as a high reaction rate of 0.06348 min−1, approximately 4.66 times that of TiO2(0.01361 min−1). Furthermore, it also demonstrated greatly enhanced photocatalytic efficiency towards methyl orange (MO) in the presence of MB compared with a single MO solution. This work provides a feasible and universal strategy of synchronous introducing nonmetal doping and biomass-derived carbon substrates to promote the photocatalytic performance of TiO2for the degradation of organic dyes.Keywords:titanium dioxide;spent coffee grounds–derived carbon;C, N doping;photocatalytic degradation;organic dyes;dye mixture
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Baoyang Lu,Yao Lu,Yangping Wen,Xuemin Duan,Jingkun Xu,Shuai Chen,Long Zhang
A novel chiral L-alanine-modified 3,4-ethylenedioxythiophene (EDOT) precursor, (2S)-(2,3-dihydrothieno[3,4- b ][1,4]dioxin-2-yl)methyl 2-( tert -butoxy carbonylamino)propanoate (EDOT-Boc-Ala), was synthesized and electropolymerized in CH 2 Cl 2 –Bu 4 NBF. The corresponding polymer, poly((2S)-(2,3-dihydrothieno[3,4- b ][1,4]dioxin-2-yl)methyl 2-( tert -butoxy carbonylamino)propanoate) (PEDOT-Boc-Ala) film showed good redox activity and stability. The electrochemical behavior, structural characterization, chirality, solubility, spectroscopic properties, thermal stability, and morphology of PEDOT-Boc-Ala film were investigated. Both doped and dedoped PEDOT-Boc-Ala film could well dissolve in strong polar solvents such as dimethyl sulfoxide, tetrahydrofuran, and acetone, etc. The determination of specific rotation showed that the electropolymerization of EDOT-Boc-Ala did not influence its conformation and the polymer exhibited an enhanced specific rotation ([α] 20.0 = -191.08°) in comparison with that of the monomer ([α] 20.0 = -30.77°). Moreover, the amperometric biosensor based on PEDOT-Boc-Ala film (as immobilization matrix of biologically-active species) was successfully fabricated and employed to determine the concentration of vitamin C.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xinxin Sun,Zhiyuan Wang,Haohui Zhang,Kaize Si,Xiaomei Wang,Xu Zhang
SiO x anodes are garnering significant interest in lithium-ion batteries (LIBs) due to theirs low voltage plateau and high capacity. However, critical drawbacks, including high expansion rate and low electronic conductivity, severely limit their practical applications. While 0D, 1D, and 2D scale nanostructures have been proven to mitigate these issues, these materials tend to accumulate after prolonged cycling, leading to adverse effects on the mass transfer processes within the electrode. Herein, we have developed a honeycomb-like SiO x /C nanoarchitecture with carbon coating based on a 3D ordered macroporous (3DOM) structure. The 3D interconnected pore windows facilitate the diffusion and transport of lithium ions (Li + ) in the electrolyte, and the extremely thin walls (<15 nm) provide a shorter transport path for Li + in the solid. The carbon cladding buffers volume expansion and enhances electronic conductivity. The as-prepared anode demonstrates a high reversible capacity of 1068 mAh/g and an initial coulombic efficiency of 70.7 %. It maintains a capacity of 644 mAh/g (capacity retention of 84.63 %) even at a high current of 1.0 A/g after 700 cycles. The unique honeycomb-like structure offers enormous insights into the study of energy storage in 3D materials.
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