CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yun-fei Zhang,Jia-le Gao,Shen-gui Chen,Lei Li,Jian-hui Xu,Dan Li,Yu-feng Liu,Xin Quan,Xin Fu,Ya-zi Xie,Jing-nan Wu,Dan-ying Lin,Ting-ting Zheng
In this study, a novel 3D printed (3DP) Nb 2 O 5 /Ti electrode with a three-dimensional pore structure was prepared using selective laser melting (SLM) 3DP technology. The electrode exhibited high degradation efficiency, low energy consumption (16.02 Wh/L for 90% removal of 5 mg/L of Florfenicol (FLO)), and promising lifetime. Specifically, the 3DP 3% Nb 2 O 5 /Ti electrode maintained a 97.0% degradation efficiency for FLO within 120 min when consecutively used for 20 cycles. It was proposed that the Nb 2 O 5 served as an n-type dopant for Ti (IV), creating an electronegative surface environment that leads to stronger binding of electrons from H 2 O or FLO to the electrode surface. Consequently, the 3D-printed Nb 2 O 5 /Ti electrode exhibits higher OER potential and a greater yield of reactive oxygen species (ROSs) compared to the undoped Ti electrode. The electrode also achieved an 82.5% defluorination ratio for FLO, which is the best dehalogenation yield reported so far. Additionally, the toxicity of intermediates was significantly reduced after electrooxidation treatment, and 11 degradation products were identified by UPLC-MS/MS for potential degradation pathways identification. This study suggests that the 3D printed Nb 2 O 5 /Ti electrode holds great promise in remediating pharmaceuticals and personal care products (PPCPs)-contaminated water, and that SLM 3D printing technology is a beneficial method for producing Ti-stabilized anodes.
研究领域:
环境科学
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电化学工程
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毒理学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Junyi Qian,Yunjing Ling,Sai Huang,Zhijie Zhang,Jiayue Xu
Solar-energy-powered CO 2 reduction into valuable chemical fuels represents a highly promising strategy to address the currently energy and environmental issues. Owing to the nontoxicity and robust reduction capability, lead-free Cs 3 Bi 2 Br 9 perovskite quantum dots (PQDs) are regarded as an attractive material for CO 2 photoreduction. Nevertheless, the potential of their applications in this field has been restricted by the severe charge recombination, resulting in unsatisfactory photocatalytic performance. Herein, a step-scheme-based Cs 3 Bi 2 Br 9 @Nb 2 O 5 (CBB@Nb 2 O 5 ) nanocomposite was fabricated by embedding the CBB PQDs into mesoporous Nb 2 O 5 . Experimental studies, along with theoretical calculations, revealed that the charge migration route in the CBB@Nb 2 O 5 nanocomposite conformed to the step-scheme (S-scheme) mode, enabling effective charge separation and strong redox ability preservation. Profiting from the promoted charge separation, as well as the improved CO 2 adsorption contributed by mesoporous Nb 2 O 5 , the CBB@Nb 2 O 5 nanocomposite unveiled superior CO 2 photoreduction performance, with CO evolution rate reaching 143.63 μmol g −1 h −1 . The present study provides a potential strategy to manufacture highly-efficient perovskite-based photocatalysts for achieving carbon neutrality.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 5
·1662-1670
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IF 9.48
Wenjing Song,Yanyan He,Sitong Lai,Weikun Lai,Xiaodong Yi,Weimin Yang,Xingmao Jiang
It is a challenge to promote aqueous-phase precise conversion of renewable lignin to valuable chemical building blocks via engineering transition metal catalysts. Motivated by the water effect in promoting catalytic activity, a Ni/Nb2O5 catalyst assembled from plenty of Nb2O5 nanoplates enabled efficient selective hydrodeoxygenation of lignin-derived phenols to alcohols in the aqueous phase. Taking advantage of hierarchical plate features, the interactions between Ni and Nb2O5 plates were enhanced, with the generation of additional interfacial Ni–NbOx sites. The presence of water significantly enhanced the selective hydrodeoxygenation performance by promoting hydrogenation and hydrolysis, and retarding the dehydration process. Through this strategy, the overall yields of alcohols for lignin oil upgrading reached 73.5 wt% in water at 220 °C.
研究领域:
化学工程
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催化科学
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可再生资源转化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Xiandi Cui,Zhiquan Yang,Xinyi Zhang,Wanhui Liu,Baosheng Zou,Wenning Liao
As an effective treatment method for uranium removal in wastewater, the application of photocatalytic reduction has attracted extensive attention. To improve the optical performance of Nb 2 O 5 , CdS nanoparticles were introduced via a one-step hydrothermal method. Then the characterization by various methods (e.g. XRD, SEM, TEM, XPS and UV–vis DRS) were used to determine the structural and optical properties of the heterojunction of Nb 2 O 5 nanorod/CdS nanoparticles (NC). It clearly confirmed that the successful construction of the heterojunction widened the visible light absorption range, narrowed bandgap (∼2.11 eV), promoted the charge transfer and enhanced the separation efficiency of photoinduced electron-hole pairs and further improved the photoreduction activity. During the photocatalytic degradation process, the results showed the photocatalyst with the Nb/Cd molar ratio of 1/3 (NC-3) displayed the best removal of U(VI), with a removal efficiency of 97% in 90 min adsorption and 150 min visible light irradiation at the pH=6. The NC-3 photocatalyst was relatively stable and exhibited good recyclability in during the cyclic experiments. In the end, it was proposed that e - and O 2 - radicals played important roles in the process of the reduction of U(VI).
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2021
·Vol. 9
·期 32
·17442-17450
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IF 12.732
Yintong Zhang,Feng Du,Ruyi Wang,Xintong Ling,Xiaoyong Wang,Qing Shen,Yujie Xiong,Tao Li,Yong Zhou,Zhigang Zou
The electrocatalytic nitrogen oxidation reaction (NOR) is a promising alternative to the industrial synthesis of nitrate. However, with the enhancement of NOR activity by modification methods, the competitive oxygen evolution reaction (OER) is always improved simultaneously. Here, a hybrid electrocatalyst composed of Au nanoparticles and oxygen vacancy-enriched niobium oxide nanobelts (Au–Nb2O5−x) was prepared on niobium foil for N2 fixation into NO3−. The results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) demonstrate that electron transfer occurs between Au nanoparticles and the oxygen vacancies in Nb2O5−x nanobelts, which adjusts the electronic structures of oxygen vacancies near the Au/Nb2O5−x interface. Electrochemical and N2 temperature-programmed desorption (TPD) tests indicate that the optimization of the electronic structure suppresses the activity of the competitive OER on oxygen vacancy sites and facilitates nitrogen adsorption on the surface of Au–Nb2O5−x, which significantly enhances the NOR performance of the electrocatalyst.
研究领域:
电化学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Jian Wang,Di Zhang,Zhaojin Li,Qiujun Wang,Huan Wang,H.J. Woo,S. Ramesh,Yachuan Shao,Bo Wang
Transition metal polysulfides/oxides typically perform high reversible capacities in sodium-ion batteries/capacitors (SIBs/SICs), but low conductivity and slow redox reaction kinetics are still the main challenges for achieveing fast kinetics. Here, we construct the VS 4 /Nb 2 O 5 /GO composite structure, which can promote the overall conductivity and structural stability through the GO and VS 4 bonding (V-C and S-C) on the surface. Meanwhile, the chain-like VS 4 and Nb 2 O 5 connected with the V-O chemical bond can accelerate the electron and ion transfer internally, thus enabling the internal structure exposed during the activation process. Additionally, the bonding of VS 4 and Nb 2 O 5 is calculated by density functional theory (DFT), indicating that the strong metallic properties of the composite. When as the anode material of SIBs, the specific capacity of 268.8 mA h g −1 can be maintained after 2000 cycles at a current density of 10 A g −1 . After that, SICs are assembled using activated carbon (AC) as the cathode, which exhibit 58.01 Wh kg −1 at high power density of 3800 W kg −1 . This unique composite structure design can provide a reference for achieving fast electron and ion transport both internally and externally to the electrode material.
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2021
·Vol. 24
·期 3
·1152-1164
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IF 10.182
Jiahui Zhan,Rui Hu,Xi Luo,Cheng Zhang,Gang Luo,Jiajun Fan,James H. Clark,Shicheng Zhang
Cyclohexanol is an essential intermediate in the chemical industry for the synthesis of nylon and other materials, but the direct hydrogenation of phenol to produce cyclohexanol is problematic owing to excessive energy consumption associated with the harsh reaction conditions. In this regard, novel composite catalysts (Ru/Nb2O5-nC18PA) coated with octadecylphosphonic acid (C18PA) were prepared via an impregnation method to be applied for the efficient hydrogenation of phenol to produce cyclohexanol in a biphasic system consisting of water and decalin solvent. Under a hydrogen pressure of 12 bar and 80 °C, nearly 100% conversion of phenol and 93% yield of cyclohexanol were achieved within 4 hours. With the introduction of more Lewis acid sites the aromatic ring is activated, which promotes the HYD (hydrogenation) path of phenol, thereby giving improved selectivity to cyclohexanol. A mechanism-exploration experiment was carried out and showed that the strong binding effect between the surface of the Ru/Nb2O5-nC18PA catalysts and the benzene ring allows the aromatic ring in phenol to be hydrogenated, increasing the selectivity to cyclohexanol. This biphasic catalytic system enhances the potential value of lignin via the catalytic hydrogenation of lignin-derived phenols.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiaxin Yao,Feng Gao,Yi Zhao,Yajie Tian,Xin Yu,Yanting Tang
Fabricating semiconductor photocatalysts with abundant oxygen vacancies and porous structures contributes to charge separation and surface photocatalytic degradation reactions. In this work, porous Cl-Nb 2 O 5-x nanostructures were synthesized via a calcination method using NbCl 5 as the niobium and chlorine sources to achieve efficient tetracycline degradation under visible-light irradiation. Porous Nb 2 O 5-x nanostructures were formed during the calcination process accompanied by the generation of oxygen vacancies. The obtained Cl-Nb 2 O 5-x samples demonstrated significantly enhanced photocatalytic performance compared to commercial Nb 2 O 5 . The synthesized Cl-Nb 2 O 5-x -450 sample exhibited the highest photocatalytic performance, achieving a maximal rate constant of 0.03093 min −1 , which markedly surpassed that of commercial Nb 2 O 5 . The remarkable enhancement in tetracycline degradation of the Cl-Nb 2 O 5-x photocatalysts was mainly attributed to the generation of oxygen vacancies and porous structures with large surface areas. Finally, the photodegradation pathways of tetracycline facilitated by the Cl-Nb 2 O 5-x photocatalysts and a plausible photocatalytic mechanism of the Cl-Nb 2 O 5-x photocatalysts were also investigated in this work.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2016
·Vol. 4
·期 45
·17838-17847
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IF 8.262
Sainan Liu,Jiang Zhou,Zhenyang Cai,Guozhao Fang,Yangsheng Cai,Anqiang Pan,Shuquan Liang
Hybrid supercapacitors (HSCs), which are expected to possess the good characteristics of both lithium batteries and supercapacitors, have become a hot research topic in recent years for catering to the growing market for electric vehicles (EVs) and hybrid electric vehicles (HEVs). Herein, we demonstrate an advanced hybrid material construction by the orthorhombic Nb2O5 quantum dots embedded in nitrogen-doped porous carbon derived from ZIF-8 dodecahedrons, referred to as NQD–NC. Then the applications of this material in LIBs and HSCs are studied in-depth. The LIB test reveals that the novel Nb2O5-based material shows excellent high-rate capability and long-term cyclic stability. Importantly, by assembling a HSC device using a NQD–NC anode and a commercial activated carbon cathode with an organic electrolyte, the HSC shows superior electrochemical performance including ultra-high energy and power density (76.9 W h kg−1 and 11 250 W kg−1, respectively) and superior cyclic stability (capacity retention of ∼85% at 5 A g−1 after 4500 cycles in a voltage range of 0.5–3.0 V). The excellent electrochemical performance of the HSCs indicates combining the advantages of lithium-ion batteries and supercapacitors, which is promising for the next generation of energy storage systems.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51046-51054
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IF 3.108
Jing Wu,Jian Li,Jin Liu,Jin Bai,Lina Yang
A novel Nb2O5/Bi2WO6 heterojunction catalyst was successfully synthesized via a one-pot solvothermal process. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with the corresponding XEDS energy mapping, UV-vis diffuse reflection spectra (UV-vis DRS), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic oxidative desulfurization performances of the prepared samples were studied with DBT as the model sulfur compound under visible light irradiation. Results indicated that the Nb2O5/Bi2WO6 exhibited considerably higher activity than pure Nb2O5 and Bi2WO6 and the desulfurization rate achieved 99% after visible light irradiation for 120 min. The catalyst also possessed good stability so that the desulfurization rate remained about 90% after seven cycle times and then the crystal structure of the catalyst has barely changed. Such enhanced photocatalytic activity is mainly attributed to the effective separation of photogenerated electron–hole pairs on Nb2O5/Bi2WO6 heterojunction. Moreover, the synergistic effects of this photocatalytic oxidation and the extraction with the methanol as the solvent played an indispensable role in the desulfurization.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Kuan Wang,Yi Wang,Dan Wang,Yuan-Xiao Du,Xin-Peng Li,Zhen-Hong He,Huan Wang,Weitao Wang,Yang Yang,Zhao-Tie Liu
The exploration of cost-efficient, environmentally friendly, and high-efficacy photocatalysts for the enhanced selective photooxidation of cyclohexane to KA oil (cyclohexanone (CHA-one) and cyclohexanol (CHA-ol)) is a pivotal challenge in the industrial realm. Herein, the present study focuses on the synthesis of needle-like S-scheme heterojunction photocatalysts with oxygen vacancies, which are achieved by the needle growth integration of nano-sized Nb 2 O 5 particles onto the BiOCl nanosheets. Remarkably, the 40 % Nb 2 O 5 /BiOCl composites exhibited superior performance in the solvent-free photooxidation of cyclohexane at room-temperature and under atmospheric pressure. The production yield of KA oil was 180.3 μmol (CHA-one/CHA-ol molar ratio = 3.5), and exceptional selectivity towards KA oil, reaching up to 99.3 %. The enhanced photocatalytic efficiency in cyclohexane oxidation can be attributed to the unique S-scheme heterogeneous interfaces with specific nanoneedle morphology, which result in the enhanced photonic absorption, effective charge carrier separation, a high density of oxygen vacancies, and the exposure of the highly reactive (001) plane of BiOCl. The excellent interfacial charge separation and transfer pathways of S-scheme heterojunction are disclosed by the in-depth EPR analysis and DFT calculations. These insights highlight the significant potential of the needle-like Bi-based S-scheme heterojunction photocatalysts for the efficient photooxidation of saturated alkanes.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Yong Wang,Feng Xin,Xiaohong Yin,Yuexiao Song,Tianyu Xiang,Junzheng Wang
Urchin-like Nb2O5 nanostructures have been successfully synthesized by a novel and simple l-arginine-assisted hydrothermal method. They are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption–desorption isotherms, thermogravimetric and differential thermal analysis (TG-DTA), and Fourier transform infrared spectroscopy (FT-IR). The results show that the urchin-like nanostructures are composed of nanowires with diameter less than 15 nm and possess a high specific surface area of 249.9 m2·g–1. Urchin-like Nb2O5 nanostructures have been used for the first time as a novel catalyst instead of conventional titanosilicate in the liquid-phase ammoximation of cyclohexanone. The as-prepared urchin-like Nb2O5 nanostructures exhibit high catalytic activity in cyclohexanone ammoximation. Under the optimal reaction conditions, the conversion of cyclohexanone and selectivity of oxime are as high as 98.0% and 88.9%, respectively. Finally, a possible formation mechanism of urchin-like Nb2O5 nanostructures is proposed.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）