Journal of Cleaner Production
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2018
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IF 5.651
Leiting Shen,Xiaobin Li,Qiusheng Zhou,Zhihong Peng,Guihua Liu,Tiangui Qi,Pekka Taskinen
To directly obtain solution of (NH 4 ) 2 WO 4 instead of Na 2 WO 4 is the key for developing a cleaner technology of ammonium paratungstate production. In this paper, ammoniacal ammonium carbonate solution was adopted for leaching tungsten from the converted product, a mixture of H 2 WO 4 and CaSO 4 obtained by treating scheelite with sulfuric acid . The research indicates that tungsten can be efficiently extracted in form of ammonium tungstate solution with WO 3 leaching yield of >99.5% under moderate leaching conditions. The WO 3 leaching yield is influenced by the transformation of calcium sulfate to calcium carbonate due to forming CaWO 4 through the secondary reaction between CaSO 4 and (NH 4 ) 2 WO 4 , whereas an excess (NH 4 ) 2 CO 3 (≥0.64 mol/L) can suppress the secondary reaction by facilitating the transformation. Additionally, the consumed ammonium carbonate can be recovered by treating the leaching residue with ammonium sulfate solution at above 70 °C. This work presents a cleaner and sustainable technique for producing ammonium paratungstate, with circulating the leaching reagents and bypassing the conversion of Na 2 WO 4 to (NH 4 ) 2 WO 4 .
研究领域:
化学工程
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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
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·
IF 4.7
Lei-ting SHEN,Yu LIU,Juan-lang GUO,Qiu-sheng ZHOU,Tian-gui QI,Zhi-hong PENG,Gui-hua LIU,Xiao-bin LI
The leaching of sulfuric acid converted product of scheelite in NH 3 ·H 2 O−NH 4 HCO 3 solution was systemically studied to improve sulfuric acid conversion−ammonium salts leaching technology route for ammonium paratungstate production. The results showed that the WO 3 leaching efficiency was about 99% under optimal conditions of 350 r/min, liquid-to-solid ratio of 3 mL/g, 1 mol/L NH 4 HCO 3 , 4 mol/L NH 3 ·H 2 O, 25 °C, and 15 min. During the leaching, CaSO 4 almost had no change and was still in a banding or rod-like shape in short leaching time, while conglobate CaCO 3 was gradually formed on the CaSO 4 surface. A secondary reaction might occur between CaSO 4 and WO 4 2− , which could be restrained by a certain amount of CO 3 2− in the solution. There was no CaCO 3 phase determined by XRD in leaching residue of converted product for scheelite concentrate under optimal conditions, which was different from that for synthetic scheelite. The leaching process could be explained by neutralization reaction of H 2 WO 4 and solid transformation of CaSO 4 in NH 3 ·H 2 O−NH 4 HCO 3 solution.
研究领域:
冶金化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yanan Wang,Lipeng Zhang,Xiuxia Meng,Liu Feng,Ting Wang,Weimin Zhang,Naitao Yang
Developing highly efficient hydrogen evolution reaction (HER) electrocatalysts is of scientific and industrial importance. We report a hollow WC electrocatalyst obtained through a scalable strategy which is a combination of spray drying method with a subsequent gas-solid carburization reaction by using ammonium metatungstate (AMT) as the precursor. The as-prepared hollow structured WC catalyst has an improved BET surface area and a pore volume in comparison with the normal bulky WC (B-WC) catalyst synthesized using the same procedure but without the spray drying treatment for the precursor, which provides the hollow WC (H-WC) electrode a highly efficient catalytic structure to drive the electrocatalytic reactions such as HER. The attractive catalytic activity of this materials is that it can catalyze the HER over a wide pH range. And the comprehensive electrochemical characterization show the H-WC superstructure has the promising potential to be well coupled with many pH-dependent oxygen evolution reaction (OER) electrocatalysts in acid, neutral, and alkaline electrolytes for an overall water splitting reaction to generate hydrogen and oxygen.
研究领域:
材料科学
·
电化学
·
能源材料
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Fengluan Jiang,Yu Deng,Keyu Chen,Jichun Li,Xin-Yu Huang,Yidong Zou,Limin Wu,Wenhe Xie,Yonghui Deng
The straightforward synthesis of noble-metal-nanoparticle-decorated ordered mesoporous transition metal oxides remains a great challenge due to the difficulty of balancing the interactions between precursors and templates. Herein, a solvent-pair-enabled multicomponent coassembly (SPEMC) strategy is developed for straightforward synthesis of noble-metal-nanoparticle-decorated nitrogen-doped ordered mesoporous tungsten oxide (abbreviated as NM/N-mWO 3 , NM = Pt, Rh, Pd). The amphiphilic poly(ethylene oxide)- block -polystyrene (PEO- b -PS) copolymers coassemble with ammonium metatungstate (AMT) clusters and different kinds of hydrophilic noble metal precursors without phase separation. SPEMC synthesis requires no direct interaction between PEO- b -PS and AMT, thus the assembly equilibriums between noble metal precursors and PEO- b -PS can be readily controlled. The obtained NM/N-mWO 3 nanocomposites possess ordered mesopores, abundant oxygen vacancies, and metal–metal oxide interfaces. As a result, the Pt/N-mWO 3 sensors exhibit superior ammonia sensing performances with high sensitivity, an ultralow limit of detection (51.2 ppb), good selectivity, and long-term stability. Spectroscopic analysis reveals that ammonia is oxidized stepwise to NO, NO 2 − , and NO 3 − during the sensing process. Moreover, a portable wireless module based on Pt/N-mWO 3 sensor can recognize ppm-level concentration of ammonia, which lays a solid foundation for its application in various fields.
研究领域:
材料科学
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纳米技术
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化学传感器
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Science
·
2025
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IF 7.4
Yang Sun,Fan Yang,Kexin Wei,Siyuan Sun,Li Sun,Junpu An,Chunhui Yu,Qing Guo,Conghan Zhang,Guang Ma,Hongchen Liu,Yongfeng Li
Constructing an asymmetric charge distribution and built-in electric field (BIEF) has proven to be an effective strategy for enhancing the catalytic performance of both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts. Herein, a Mo-doped Ni/WO3 heterojunction catalyst was immobilized on Ni foam for enhancing the performance of the HER and OER. The constructed Ni/WO3 heterointerface facilitates electron transport, while the incorporation of Mo further amplifies charge asymmetry in the interfacial region. The optimized Mo3–Ni/WO3 catalyst exhibits excellent performance, requiring only 13 mV and 328 mV overpotential to reach current densities of 10 and 100 mA cm−2 for the HER and OER, respectively. Besides, it maintains stable overall water splitting performance at 100 mA cm−2 for 90 h. The asymmetric distribution of Ni/WO3 interfacial charge is promoted and electron transport is enhanced by Mo doping. Theoretical results show that element doping in the heterostructure turns W sites into additional adsorption centers, optimizing the energetics of H* adsorption during the HER. Mo doping reduces the work function (φ) of Mo3–Ni/WO3, promoting efficient electron transfer and lowering the energy barrier for intermediate formation, thereby enhancing OER activity. This strategic modulation of charge asymmetry in heterojunction architectures provides a new approach for the rational design of high-performance bifunctional electrocatalysts.
研究领域:
电催化
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材料科学
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能量转换
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异质结构工程
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水分解
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Manwen Hu,Jiejie Yu,Ruijie Qin,Jinwu Hu,Jingcheng Xu,Hui-jun Li,Hui Xu,Jingbo Chen,Ding Wang
Long-term exposure to xylene can seriously damage the respiratory and central nervous systems. Xylene poses significant health risks even at trace levels in the ppb range, highlighting the need for the ppb-level detection. Designing high-performance gas-sensitive materials and sensing structures is essential to address high operating temperatures and poor trace detection. In this work, PtPd nanobimetallic-sensitized CeO 2 porous nanospheres were prepared as the upper catalytic layer via solution self-assembly and impregnation, with WO 3 nanofibers as the lower sensing layer to form a bilayer sensor. The 1 wt%Pt 70 Pd 30 /CeO 2 /WO 3 sensor showed the best response (R a /R g = 38.67) to 10 ppm xylene at 180℃, and it demonstrates a obvious response to xylene at ultra-low concentrations down to 1 ppb (R a /R g = 1.4). The sensor also exhibits good stability and notable humidity resistance. By combining in-situ infrared and online mass spectrometry, we show that xylene is catalytically converted into toluene and methyl radicals upon passing through the 1 wt% Pt 70 Pd 30 /CeO 2 layer, significantly enhancing response performance. In summary, the novel bilayer sensor developed in this study enables trace xylene detection at the ppb level and shows potential for environmental monitoring applications.
研究领域:
材料科学
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传感器与检测技术
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环境监测
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纳米技术
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
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IF 7.5
Qiaochu Zhou,Yiyang Wang,Zhe Zhang,Chi Zhang,Fang Li,Qiming Li
Hydrogen production from NaBH 4 hydrolysis is a promising approach to on-site H₂ supply, but its practical use is constrained by insufficient catalytic activity and stability of current catalysts. Here Co 3 O 4 catalysts doped with different transition metal ions (W, Ni, Cu and Mo) were prepared via a combined citric-EDTA acid complexation and applied for H 2 generation via NaBH 4 hydrolysis. Effects of various transition metal ions on crystal structure, surface morphologies, and catalytic performance of Co 3 O 4 catalysts were systematically investigated. It can be found that minor doping of transition metal ions does not change the bulk spinel structure of Co 3 O 4 catalysts but can obviously impact its crystallinity and surface morphologies. Moreover, Co 3 O 4 catalysts exhibit distinct induction periods before reaching maximum catalytic activity, with the duration dependent on the type of metal dopants. Notably, Ni-doped Co 3 O 4 catalysts exhibit the highest catalytic activity of 2320 mL·min -1 ·g -1 and a relatively low activation energy of about 25.27 kJ·mol -1 . By contrast, Cu doping exerts a negative effect on the stability of pristine Co 3 O 4 . The catalytic performance follows the order Ni > Mo > W > Cu, with Cu‑doped Co 3 O 4 showing a significantly degraded activity of only 1380.4 mL·min -1 ·g -1 . Meanwhile, an excessively high doping content results in decreased catalytic activity for all samples. This work clarifies the correlation between transition metal doping and Co 3 O 4 optimization, offering theoretical guidance for rational design of high-performance NaBH 4 hydrolysis catalysts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Zhan Zhao,Tao Shi,Jia Liang,Kelei Huang,Xiangchao Meng
Acceleration of hydrogen spillover on electrocatalysts is effective for improving the hydrogen evolution reaction. However, it is still challenging to design rational proton migration pathway. Herein, we propose an in-situ reconstruction strategy to provide MoO 4 2− -modified micro-environment, which prominently promotes the hydrogen spillover effect. The Mo species is introduced to be in situ oxidized and transformed to MoO 4 2− . Experimental and theoretical studies indicate that the generation and re-adsorption of MoO 4 2− not only suppress the interfacial electron accumulation, but also optimize the electronic structure to facilitate thermo-neutral adsorption of H*, thus forming the effective hydrogen spillover channel. Finally, the reconstructed catalyst exhibits excellent HER performance (overpotential of 183 mV at 1000 mA cm −2 in alkaline solution) and sustained high stability for 1000 h at 1000 mA cm −2 , which also shows great promising prospects for practical applications ( E W : 4.09 kW h m −3 ; η ETH : 86%@60 ℃) in anion exchange membrane alkaline water electrolyzer.
研究领域:
电化学
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催化
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能量转换
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材料科学
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纳米技术
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Boxiang Gao,Yan Yan,Shuai Zhang,Zenghui Wu,You Meng,Yuxuan Zhang,Weijun Wang,Yi Shen,Siliang Hu,Bowen Li,He Shao,Pengshan Xie,SenPo Yip,Johnny C. Ho
Van der Waals (vdWs) p–n junctions assembled from 2D materials offer enhanced flexibility for creating versatile electronic and optoelectronic devices, attracting significant interest. However, the lack of reliable methods to produce high-quality p-type 2D semiconductors, especially patterned p-type channels, remains a major challenge for progress in the field. Here, a precise substitutional doping strategy for 2D semiconductors is presented, enabling the production of millimeter-scale WS 2 single-crystal thin films with tailored p-type and n-type properties. This advancement supports the fabrication of high-performance WS 2 -based p-type and n-type field-effect transistor (FET) miniaturized arrays with near-ohmic contact. Building on this progress, a WS 2 van der Waals homojunction p-n array demonstrating distinct anti-ambipolar behavior and excellent rectification characteristics is developed. In self-powered photodetection mode, leveraging the strong coupling of the vdWs homojunction interface, the device achieves an exceptional photovoltaic effect with a high specific detectivity of 3.4 × 10 10 Jones and a fast response time of 400 µs. The development of WS 2 p-n homojunction arrays presents immense potential for advancing next-generation logic electronics and optoelectronic devices, opening new avenues for large-scale industrial applications.
研究领域:
材料科学
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电子工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 33
·1-8
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IF 2.8
Na Rishun,Ma Yongbo,Chao Luomeng
The alkaline earth metal tungsten bronze Ca 0.1 WO 3 was successfully synthesized using the solid-state reaction method. XRD, SEM, and TEM analyses confirmed the good crystallinity of the material, although severe particle aggregation was observed. Optical property tests revealed low absorption and reflection in the visible light region, and higher values in the near-infrared region for Ca 0.1 WO 3 . XPS measurements and DFT theoretical calculations suggested that the introduction of Ca ions transformed WO 3 from a semiconductor to a metallic state, with partial reduction of hexavalent W to pentavalent W. This introduced additional free electrons to the material, resulting in localized surface plasmon resonance (LSPR) effects under incident light, significantly enhancing its near-infrared absorption performance. These characteristics of alkaline earth metal tungsten bronze make it a potential candidate for transparent thermal insulation materials.
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Weishan Qin,Ting Su,Guodong Chai,Xinhong Wang,Weichao Qin,Hongbin Yu
Photoelectrocatalysis is a promising method for removing biorefractory organic pollutants. However, the inefficient utilization of light and electricity by photoanodes and the failure to effectively execute cathode functions typically lead to poor degradation performance. Therefore, in this study, a photoelectrocatalytic (PEC) system coupled with electro-activated persulfate (E-PS) was constructed using a 3D nanostructured PbO 2 /Sb-SnO 2 //blue-TiO 2 //WO 3 bifacial anode and a Mo-CuFeO 2 -modified carbon felt cathode. The results indicate that the bifacial anode could effectively implement electro-assisted photocatalysis on the irradiating side and electrocatalysis on the back side. This significantly accelerated acetaminophen degradation with a synergy index of 48.98 %. Additionally, the PEC/E-PS system was established by combining a bifacial anode with a persulfate-activated cathode, which promoted the efficient utilization of photogenerated electrons and increased the number of active species in the coupled system. Density functional theory calculations confirmed that Mo tended to dope the Fe sites and promote the adsorption of PS on Mo-CuFeO 2 , facilitating the continuous activation of persulfate. In the coupled system, the contribution order of different active species to acetaminophen degradation was h + > OH > SO 4 − > 1 O 2 > O 2 − . Their mutual conversion enabled the PEC/E-PS system to efficiently remove acetaminophen with a relatively high current efficiency (22.69 %) and low energy consumption (0.06 kWh⋅gCOD −1 ). The proposed PEC/E-PS system is an efficient and sustainable method for treating organic contaminants in wastewater.
研究领域:
环境科学
·
电化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Wang Ding,Qin Rui-Jie,Yu Jie-Jie,Hu Jin-Wu,Zhang Wen-Hui,Xu Hui,Xu Jing-Cheng,Liao Qiao-Bo,Li Hui-Jun,Wang Xu-Hui
The semiconductor gas sensors used for xylene gas detection in real time has been restricted by the inadequate sensitivity and selectivity. Constructing a bilayer cascade sensor with the catalysis-gas sensitivity synergistic is considered as an effective solution. Herein, the Ag@CeO 2 nanosheets are synthesized by heat treating the Ag@Ce-MOF, which synthesized via solvothermal method. The morphological evolution of cerium metal–organic framework (Ce-MOF), regulated by Ag ions, is investigated, and the transformation mechanism is proposed. The bilayer sensors were constructed by using WO 3 nanofibers, prepared via the electrospinning method, as the sensitive layer and the Ag@CeO 2 nanosheets as the catalytic layer, respectively. The bilayer sensors exhibit remarkable performance in response to xylene. The response value ( R a / R g ) of WO 3 /Ag@CeO 2 sensor to 10 ppm xylene gas reaches 32.13 at the operating temperature of 160 °C. Additionally, the sensor displays an exceptional response to even trace amounts of xylene, as low as parts per billion (ppb). The catalysis-gas sensitivity synergistic mechanism was elucidated by capturing catalytic intermediates using online mass spectrometry. These findings provide a novel strategy for benzene series (BTEX) sensor and offer a novel approach to prepare two-dimensional Ce-MOF and its derived materials with tailored properties. Graphical abstract
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）