APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Yuanzhi Hong,Yinhua Jiang,Changsheng Li,Weiqiang Fan,Xu Yan,Ming Yan,Weidong Shi
The constructing of direct solid-state Z-scheme heterojunction photocatalytic system has received much attention in environmental purification and hydrogen generation from water. In this study, a novel direct solid-state Z-scheme V 2 O 5 /g-C 3 N 4 heterojunctions were synthesized via a facile in-situ growth strategy for the first time. The photocatalytic performance was evaluated by the degradation of rhodamine B (RhB) and tetracycline (TC) under visible light irradiation ( λ > 420 nm). Results show that the as-synthesized heterojunctions can significantly enhance photocatalytic activity in comparison with pure g-C 3 N 4 and V 2 O 5 . The optimum photocatalytic efficiency of VC1.0% sample for the degradation RhB was about 7.3 and 13.0 times higher than that of individual g-C 3 N 4 and V 2 O 5 , respectively. In addition, the VC1.0% sample as well as can efficiently degrade methyl orange (MO) and methylene blue (MB) under visible light. By further experimental study, the possible for the enhancing photocatalytic mechanism was found to be a direct solid-state Z-scheme heterojunction system based on the active species trapping and electron spin resonance (ESR) experiments, which not only can improve the photogenerated electron–hole pair’s separation but also exhibit a strong oxidation and reduction ability for efficiency degradation of organic pollutants. This work will be useful for the design of other direct solid-state Z-scheme photocatalytic systems for application in energy conversion and environmental remediation.
研究领域:
材料科学
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环境科学
·
光催化
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化学工程
·
能量转换
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DOI
高影响因子
DESALINATION
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2020
·
IF 7.098
Baojun Liu,Lanlan Yu,Fei Yu,Jie Ma
Capacitive desalination (CDI) has aroused much attention due to its advantages of low energy consumption and environmental compatibility. However, typical CDI processes display limited efficiency. In this work, one-dimensional V 2 O 5 with nanocuboid structure was prepared with MXenes(V 2 C) precursor for the first time, which has high adsorption capacity, structure stability and fast ion diffusion ability. The as-synthesized V 2 O 5 electrode achieved a salt adsorption capacity(SAC) of 55.2 mg NaCl g −1 V 2 O 5 under optimized conditions with a constant current density of 30 mA g −1 , a voltage range from −0.6 to 1.2 V, and an initial solution of 500 mg L −1 NaCl. Furthermore, from the comprehensive analysis of mechanism, due to the high conductivity and low charge transfer resistance of V 2 O 5 electrode, it reduces the energy loss of the resistance during desalination. A particularly low energy consumption of 0.27 kWh kg −1 -NaCl is reached when the operation is carried out successfully at low voltage range, indicating the advantages of energy saving and high efficiency. Therefore, V 2 O 5 is an attractive and promising electrode material, which exhibits the potential of pseudocapacitive materials with certain structure for practical CDI application in future and inspires us to have a deep insight into the effect of morphology on the properties.
研究领域:
材料科学
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环境工程
·
电化学
·
纳米技术
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DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Wenbo Jia,Yueyuan Wang,Shaohua Ling,Liren He,Binghe Chen,Songtao Liu,Chuanmin Chen,Yue Cao
Fast selective catalytic reduction (SCR) atmosphere can significantly improve the NOx removal activity of VWTi catalysts, while the catalytic performance and reaction pathway of Hg0 oxidation in a fast SCR atmosphere are still unclear. In this paper, the catalytic activity of simultaneous NOx removal and Hg0 oxidation over VWTi catalysts in a simulated fast SCR atmosphere was investigated for the first time. The results showed that VWTi catalysts possessed a wide NOx removal active temperature window and a high Hg0 oxidation activity in a fast SCR atmosphere. The X-ray photoelectron spectroscopy (XPS) and Hg temperature-programmed desorption (Hg-TPD) methods were used to investigate the Hg0 oxidation process over VWTi catalysts in a fast SCR atmosphere. Combined with the homogeneous Hg0 oxidation experiment results, two domination reaction routes of Hg0 oxidation over VWTi catalysts in a fast SCR atmosphere were proposed. One was that the adsorbed Hg0 could react with the surface active species to form HgO. The other reaction route was a gaseous homogeneous route that the gaseous Hg0 could be oxidized directly to Hg(NO3)2 by gaseous NO2. Particularly, the gaseous homogeneous Hg0 oxidation process could notably weaken the inhibition effect of NH3 on Hg0 oxidation, thus improving the Hg0 oxidation activity of VWTi catalysts in a fast SCR atmosphere.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Xiaoqiang Wang,Wenjie Liao,Yongyong Cao,Yue Liu,Zhongbiao Wu
In this study, a series of V 2 O 5 -MoO 3 /TiO 2 (VMo/Ti) catalysts were prepared using TiO 2 supports with varying specific surface area for selective catalytic reduction of NO x by ammonia (NH 3 -SCR). The activity tests revealed that the NO conversion of different samples showed a volcano-type variation with surface area rising, where the VMo/Ti-S3 catalyst with moderate surface area possessed the best SCR activity (>80% NO conversion at 250 °C). Meanwhile, the SO 2 oxidation ratio decreased at an elevated surface area. At 350 °C, the SO 2 oxidation ratio of VMo/Ti-S1 catalyst with lowest surface area was about 4.4%, which was around 4 times that of VMo/Ti-S4 sample with highest surface area. Characterization results indicated that, as the surface area increased, both the redox capacity and surface acidity were enhanced. And the vanadium oxides became less polymeric with a gradual increased ratio in dimeric vanadium species and finally more monomer VO x formation, corresponding to the highest SCR activity of VMo/Ti-S3 catalyst. Additionally, the characterization results indicated that the chemisorption of SO 2 was inhibited on high-surface-area catalysts, which was consistent with DFT results. And DFT simulations also confirmed an increased energy barrier for SO 2 oxidation to generate SO 3 process on less polymeric vanadium species. Both the results above indicated the critical role of vanadium polymerization state in SCR activity and SO 2 oxidation. This work offers new insights into the development of efficient SCR catalysts with low SO 2 oxidation rates for industrial applications.
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DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Lan Li,Tingxue Fang,Fuming Lai,Xinyue Li,Tingting Qu,Lin Wang,Xiaoshi Lang,Kedi Cai
Vanadium pentoxide (V2O5) is regarded as a promising sulfur-wrapped matrix for high-performance lithium–sulfur batteries, owing to its desirable structural and functional characteristics. In this paper, a large number of defective sites arise in the vanadium pentoxide structure via a codecoration strategy of the V, O sites, which is more beneficial to improving the electroconductivity and allows for the uniform loading of sulfur on the surface, thereby reducing the polarization resistance and elevating the kinetic rates during the electrochemical reaction. Electrochemical test results indicate that Mg2+/S-codecorated V2O5/S composite cathodes have 1131.15, 942.39, and 804.71 mAh·g–1 of discharge-specific capacities at 0.1, 0.2, and 0.5 C rates, respectively, with the lowest charge/discharge plateau voltage difference, and the capacity retention rate after 140 cycles can be 57.95%. Besides that, the multidefect V2O5 can effectively promote the adsorption strength of lithium polysulfide and catalytically accelerate the rate of liquid-phase conversion between lithium polysulfide so as to achieve the stable electrochemical properties for sulfur composite cathodes.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Guopeng Yang,Qinggang Li,Guiqing Zhang,Mingyu Wang,Zuoying Cao,Wenjuan Guan,Jiawei Du,Shengxi Wu
Traditional vanadium extraction process, which involves H 2 SO 4 stripping after solvent extraction followed by ammonium vanadate precipitation, faced the issues of large amount of reagent consumption and discharge of ammonia contaminated wastewater. Hydrogen peroxide stripping and precipitation of vanadium products by heating process was considered as a novel alternative for H 2 SO 4 stripping - ammonium vanadate precipitation route due to the ammonia-free wastewater and high efficiency. However, it was found that the V stripping efficiency was in the range of 54.9% ∼ 97.7% during the pilot test of 3-stage counter-current stripping, which was extremely unstable, as the high stripping efficiency (>95%) could only be achieved in a very short operation time (within 30 s). To solve these issues, the ion species transformation and the stripping mechanism of V with H 2 O 2 were systematically investigated. In this study, experimental results demonstrated that re-extraction led to a decrease of stripping efficiency. The use of D2EHPA alone without TBP as a modifier had a clear effect on prolonging the duration of maximum stripping efficiency at the optimal conditions so that the continuous operation of the pilot test was possible. The optimal stripping conditions were a molar ratio of H 2 O 2 :V of 4:1, phase ratio (O/A) of 3:1, temperature of 20 °C，stripping time of 8 min and the operation time of 3 min which resulted a ∼ 98% V stripping efficiency. In addition, the precipitation of vanadium products by heating, proposed in this work was a cleaner and more efficient V precipitation procedure that didn't require any reagents and produced no wastewater. Eventually, heating the strip liquor at 100 °C for 1 h resulted a precipitation efficiency of 96% V. The intermediate precipitated products (V 5 O 12 ∙6H 2 O and V 10 O 24 ∙12H 2 O) were roasted to obtain V 2 O 5 with a purity of >99%. Finally, the new process saves 885.2 $/t V 2 O 5 compared with the traditional process according to the cost analysis. The research results provide an efficient, clean and economical process for recovering V 2 O 5 from titanium-white waste.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 37
·18003-18009
·
IF 9.931
Ruixiang Qu,Weifeng Zhang,Xiangyu Li,Yanan Liu,Tzungyu Shih,Yen Wei,Lin Feng
A co-responsive material is successfully fabricated by coating nano-vanadium pentoxide/octadecylamine (nano-V2O5/ODA) onto a copper mesh via a hydrothermal reaction. “Co-response” means that a material can realize a multi-performance transition under one environmental stimulus. Nano-V2O5 provides the material with a photo-induced wettability transition and reactive oxygen species (ROS) generation properties, while ODA produces a superhydrophobic material in its initial state. As a result, this material can achieve a reversible superhydrophobic/superhydrophilic transition under 254 nm ultraviolet (UV) light. By combining the wettability transition with ROS generation properties, a smart mesh can realize in situ photo-controlled water purification, i.e., the controllable and simultaneous removal of the oil and soluble contaminants. An extra V2O5-coated mesh is used as an auxiliary mesh to improve the oil removal and ROS generation efficiencies. Moreover, the mesh exhibits satisfactory reusability and physical/chemical stability, which is more promising for practical applications such as remote controlled water purification, timed discharge of sewage and microfluidic valves.
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Chen Zhang,Li Chen,Yi He,Chunlin Chen,Youqing Wu,Fei Zhong,Hongjie Li,Peng Xie,Xiao Guo
Inspirations from nature have led to extensive developments in metal passivation and smart self-healing technologies toward metal corrosion protection. Integration of both intriguing features helps to achieve high-efficiency corrosion inhibition protection. In this study, we designed a novel anticorrosion system composed of waterborne epoxy (WEP) and VPC nanofillers (V 2 O 5 modified by polyaniline and tannic acid complexes) (V 2 O 5 @PANI@Fe-TA (3)). Among them, the PANI-modified V 2 O 5 particles have dual roles as oxidation passivation protection and a passive barrier. The tannic acid corrosion inhibitor loaded onto the particles can be released under pH stimulation to provide appropriate activity inhibition function. This dual, synergistic self-healing protection coupled with a robust film barrier was the main reason for the strong anticorrosion properties of the coating system. In a specific experiment, the anticorrosion performance of the composite coatings was verified by electrochemical and salt spray tests. Results revealed that the value of |Z| 10mHz for VPC/WEP composite coating was still higher than 10 8 Ω/cm 2 after 80 d of immersion as compared to those of the pure WEP. Interestingly, the VPC/WEPs also exhibited a significant self-healing effect when the corrosive medium reached the metal/coating interface through defects or artificial scratches. This is due to the synergistic protective effect of metal passivation and activity inhibition, which enhanced the anticorrosion properties of the coating system.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Weiwei Wang,Rui Huang,He Peng,Ruiting Hu,Ling Ran,Yu Tao,Li Yani,Jun Yan
The emerging aqueous Zn-ion batteries (ZIBs) with their low price and inherent safety are showing strong competitiveness in the energy storage field. In this work, layer-by-layer stacked amorphous V 2 O 5 @Ti 3 C 2 T x heterostructures anchored on three-dimensional carbon cloth (3D CC), synthesized by annealing process and subsequent in-situ electrochemical induction, are reported as high capacity and stable cathode for ZIBs . In this composite cathode, amorphous V 2 O 5 @Ti 3 C 2 T x synergistic heterostructure provides isotropic Zn 2+ migration channels and rapid electron transfer kinetics, while the 3D CC substrate can ensure that the bulk phase in the electrode material is also utilized to maximize the synergistic effect. As a result, the CC/a-V 2 O 5 @Ti 3 C 2 Ti x cathode achieves a high specific capacity of 567 mAh/g at 0.1 A/g, a satisfactory rate performance of 213 mAh/g at 10 A/g, together with a long cycle life of 96.2 % capacity retention after 2000 cycles. Ex-situ characterizations show that the CC/a-V 2 O 5 @Ti 3 C 2 T x cathode undergoes a highly reversible Zn 2+ /H + co-intercalation/deintercalation mechanism during the discharge/charging process. In addition, based on the CC/a-V 2 O 5 @Ti 3 C 2 T x cathode, the assembled flexible ZIB can operate properly under different bending degrees, showing its practicality in flexible devices. This work provides insight into the rational design of cathode materials with high Zn-storage performance.
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DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
jialong Kang,Zhenyun Tian,Dapeng Zhong
The abundant metal Ti is a high-quality metal with lightweight, high strength, and corrosion resistance. However, due to its harsh preparation conditions, the price remains high, so titanium metal's simple and effective products have become a challenge for the world's scientific research community. In this paper, by calculating the oxygen potential of Ti–O, Ti–H, and Ti–H–O solid solutions, the oxygen potential of Ti–H–O was obtained when the oxygen content was 0.03 and 0.009. As H 2 enters the Ti–O lattice, the oxygen potential of the Ti–H–O system increases with the increase of H content. Thermodynamic calculations showed that introducing hydrogen effectively destroyed the stability of Ti–O solid solutions. At the same time, this paper uses a magnesiothermic as a reducing agent. To verify the feasibility of the above thermodynamics, reduce the spent V 2 O 5 –WO 3 /TiO 2 catalyst (Ti > 80 wt%) of titanium-rich materials in a hydrogen atmosphere. Finally, the spent V 2 O5–WO 3 /TiO 2 catalyst was reduced at 750 °C for 8–24 h to obtain TiH 2 powder with an oxygen content of 0.9 wt%.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zulfiqar Ali,Yang-wen Wu,Yue Wu,Zulqarnain Arain,Ming-xin Xu,Qiang Lu,Heping Ma,Huan-yu Zhao
Lead (Pb) species are inescapable constituents of the flue gas from coal-fired power plants and other thermal devices, which can cause impeding effects on the selective catalytic reduction (SCR) reactions. Here, the poisoning effects of Pb on the V 2 O 5 -MoO 3 /TiO 2 type SCR catalyst were examined. The poisoned catalysts were prepared by the solid diffusion and incipient wetness impregnation (IWI) methods. The catalytic activity tests indicated that the Pb-doped catalyst prepared by the IWI method suffered a considerable drop in catalytic activity, while a slender influence was observed on the Pb-loaded catalysts prepared by solid diffusion method. Comprehensive characterizations and density functional theory (DFT) calculations were performed on the fresh and poisoned catalysts prepared by the IWI method to unveil the deactivation mechanism. The results showed that Pb species covered the active sites (V species) on the catalyst surface, resulted in the decrease in chemisorbed oxygen, hence reducing the surface acidities. The decrease in reducibility of the catalyst was an important factor for poisoning of the catalyst. Moreover, Pb species reacted with MoO 3 to form PbMoO 4 which agglomerated on the catalyst surface to further deactivate the catalyst.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 36
·24689-24695
·
IF 4.123
Minghai Yao,Peng Wu,Shuang Cheng,Lufeng Yang,Yuanyuan Zhu,Mengkun Wang,Haowei Luo,Bangfen Wang,Daiqi Ye,Meilin Liu
α-V2O5 nanowires with a layered structure have been fabricated through a two-step procedure. When measured as a pseudo-capacitive electrode with a three-electrode configuration in 1 M Na2SO4 aqueous solutions, α-V2O5 exhibits ideal capacitive characteristics with a specific capacitance of ∼238 F g−1 at a high current of 2 A g−1, but poor cycling stability with a continuous drop in the first 2000 cycles before it is maintained. To find possible solutions towards this problem, the energy storage behavior of the α-V2O5 electrode has been carefully investigated. In situ Raman analysis suggests that it is electrolytic hydrated cations [Na(H2O)n]+ rather than anions (SO42−) that are involved in the energy storage process through reversible adsorption/desorption on the surface or intercalation/deintercalation at the interlayer of the (001) planes accompanied by interlayer spacing expansion/contraction. Moreover, the electrochemical quartz crystal microbalance results indicate that, besides a reversible mass change, there is a continuous mass loss that may originate from slow dissolution of V2O5, which should bear the main responsibility for the poor stability (initial dramatic drop). Hence, how to inhibit dissolution, such as by coating or adding additives in the electrolyte, is found to be the key approach to improve the stability of V2O5 based electrodes.
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PubMed
高影响因子
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