POLYMER INTERNATIONAL
·
2017
·Vol. 67
·期 4
·445-452
·
IF 2.07
Mengjiao Zhang,Weihong Wu,Shaorui He,Xue Wang,Yunhong Jiao,Hongqiang Qu,Jianzhong Xu
The synergistic effects of activated carbon (AC) and molybdenum oxide (MoO 3 ) in improving the flame retardancy of poly(vinyl chloride) (PVC) were investigated. The effects of AC, MoO 3 and their mixture with a mass ratio of 1:1 on the flame retardancy and smoke suppression properties of PVC were studied using the limiting oxygen index and cone calorimeter tests. It was found that the flame retardancy of the relatively cheaper AC was slightly weaker than that of MoO 3 . In addition, the incorporation of AC and MoO 3 greatly reduced the total heat release and improved smoke suppressant property of PVC composites. When the total content of AC and MoO 3 was 10 phr, PVC/AC/MoO 3 had the lowest peak heat release rate and peak smoke production rate values of 173.80 kW m −2 and 0.1472 m 2 s −1 , which represented reductions of 47.3 and 59.9%, respectively, compared with those of PVC. Furthermore, thermogravimetric analysis and gel content tests were used to analyze the flame retardant mechanism of AC and MoO 3 , with results showing that AC could promote early crosslinking in PVC. Char residue left after heating at 500 °C was analyzed using scanning electron microscopy and Raman spectroscopy, and the results showed that MoO 3 produced the most compact char, with the smallest and most organized carbonaceous microstructures. © 2017 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2022
·Vol. 74
·期 7
·2742-2749
·
IF 2.597
Zhang Rui-Hua,Hao Zhen-Hua,Shi Lin-Yuan,Chen Hao-Tian,Shu Yong-Chun,He Ji-Lin
In this present study, carbothermic reduction process of MoO 3 to produce MoO 2 has been carried to investigate the influences of reaction temperature and distance between activated carbon and MoO 3 on phase composition of reduction products by controlling carbon diffusion. Results show that the reduction degree increases with the increase of temperature and the decrease of distance between activated carbon and MoO 3 . MoO 3 can be completely reduced to MoO 2 at 680°C with the carbon distance of 1 mm. It is found that the transformation from MoO 3 to MoO 2 is a process of crystal cracking and growth by observing the phase transition and morphological evolution during the reduction. The massive MoO 3 is first decomposed into a platelet-shaped MoO x (2.75 < x < 3), then the platelet-shaped MoO x changes into a needle-like shape or irregular platelet-like Mo 4 O 11 , and finally Mo 4 O 11 changes into irregular granular or irregular platelet-like shaped crystals, which form MoO 2 powders.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2025
·
IF 3.2
Mi Jiayu,Wang Zhenqiang,Qiu Yuqing,Chen Xingyu,Chen Ailiang,Liu Xuheng,Li Jiangtao,He Lihua,Sun Fenglong,Zhao Zhongwei
The leaching agents for molybdenum calcine are mainly acid and alkali solutions represented by ammonia water, which have poor selectivity for molybdenum and are not environmentally friendly. Therefore, a novel leaching agent which can avoid the aforementioned problems needs to be sought. Given that molybdenum in molybdenum calcine mainly exists in the form of molybdenum trioxide, this research investigated the dissolution behavior of molybdenum trioxide in sodium molybdate solution under different process conditions was studied, and the leaching of molybdenum calcine in sodium molybdate solution was preliminarily tested. The Raman characterization results of the dissolution system indicated that molybdenum trioxide and sodium molybdate with low polymerized states can form high polymerized molybdate through self-coordination reaction. The optimal dissolution conditions were 85 °C, pH 8.00, initial molybdenum concentration 26.78 g/L. Under the optimal conditions, the dissolution capacity of molybdenum trioxide in sodium molybdate can reach 2.460 g/g. The preliminary leaching test indicated that the sodium molybdate system had a high selectivity for molybdenum in molybdenum calcine, and the leaching ratio of molybdenum was 96.4%. This study confirmed the feasibility of sodium molybdate as a leaching agent for molybdenum calcine and laid a theoretical foundation for the leaching process of molybdenum calcine. Graphical
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 48
·11449-11456
·
IF 5.066
Xiaolong Lu,Rongguo Wang,Lifeng Hao,Fan Yang,Weicheng Jiao,Jian Zhang,Ping Peng,Wenbo Liu
After UV irradiation of orthorhombic molybdenum trioxide (α-MoO3) nanosheets dispersed in two different solvents including water/ethanol mixed solvents and individual N-methyl-2-pyrrolidinone (NMP), we observed remarkable but distinct morphology changes in combination with different photochromic phenomena. MoO3−x quantum dots (QDs) with both different sizes and oxygen vacancy concentrations could be acquired through this facile and efficient method. The consumption of photoexcited holes played an important role in the morphology changes. In water/ethanol, intercalation of H+ originating from the oxidation of water by photoholes contributes to the acquisition of QDs. While in NMP, we provided a new insight and proved that photocorrosion induced by accumulated holes was responsible for the morphology evolution and acquisition of QDs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2021
·Vol. 24
·期 3
·2100858
·
IF 3.862
Jiangan You,Jian Xue,Zhiwei Jiang,Tao Tang
Although the rigid cross-linked polyvinyl chloride (c-PVC) foam has excellent mechanical properties, there are still problems of unsatisfactory thermal insulation performance, flame retardancy, and smoke suppression. So how to simultaneously improve the thermal insulation and flame retardant properties of c-PVC foam is still a challenge. Herein, the combination of copper powder and molybdenum trioxide (Cu/MoO 3 ) is used to prepare c-PVC composite foams. The cell structure, thermal conductivity, thermal stability, limiting oxygen index (LOI), and smoke density of the c-PVC composite foams are characterized. The results showed that, on the one hand, the cell density and thermal insulation performance are improved (31.24 mW m −1 K −1 ) due to the good heterogeneous nucleation and infrared reflection of the copper powder. On the other hand, when the mass ratio of Cu/MoO 3 is 4/1, the best synergistic catalytic effect to promote char formation achieved the highest LOI value of 30.1, and the smoke density rating (SDR) is reduced by 27%. This work is beneficial to the design and application of c-PVC foams with high performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 5
·1516-1525
·
IF 8.8
Wang Mei-Ling,Zhao Jin,Wang Jin-Jin,Zhang Jun-Ming,Tian Yu-Zhu,Yue Zhi-Zhu,Li Dong,Hu Tian-Jun,Jia Jian-Feng,Wu Hai-Shun
metal oxide electronic interactions in composite electrocatalysts have a considerable impact on their catalytic capability. In this study, we successfully synthesized an electrocatalytic material composed of MoO 3 /C species-supported Pd nanoparticles (Pd-MoO 3 /C) using a convenient hydrothermal method, which exhibited excellent catalytic activities for both ethanol oxidation and oxygen reduction in KOH media. The specific activity of Pd-MoO 3 /C toward ethanol oxidation with MoO 3 loading (40 wt%) was ~ 2.6 times greater than that for the commercial Pd/C (10 wt%) with the same Pd content. In particular, the activity could effectively hold up to ~ 60% of its maximum activity after 500-cycle tests, demonstrating improved cyclical stability. Notably, the fast electron transfer kinetics toward oxygen reduction for Pd-MoO 3 /C (40%) were also comparable to those of commercial Pt/C (20 wt%) catalysts. These superior electrochemical features are primarily derived from the stronger electronic coupling between Pd and MoO 3 through charge transfer, which can supply more active centers and improve the anti-poisoning ability. Meanwhile, the MoO 3 species in the Pd-MoO 3 /C composite may provide additional benefits in terms of electrical conductivity and dispersion. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuwen Zhu,Huiqing Fan,Yao Su,Yongbo Fan,Weijia Wang
Real-time monitoring of triethylamine (TEA) is essential for environmental safety and various applications in daily life. However, TEA gas sensors still encounter specific technical challenges, such as high operating temperatures and insufficient sensitivity. In this study, in order to reduce the operating temperature and improve sensitivity, WO 3 -MoO 3 (WMo) n-n heterojunctions were synthesized via calcination and subsequent solvothermal method, in which WO 3 tightly bound to the MoO 3 nanobelt surface. The resulting heterojunction demonstrated excellent TEA sensing performance. The optimized gas sensor achieved a high response of 627.28 to 20 ppm TEA at a low operating temperature (100 °C). In addition, the device exhibited strong selectivity and stability. These improvements in gas sensing performance were attributed to the formation of n-n heterojunction between MoO 3 and WO 3 , as well as the surface gas sensing reaction of oxygen species facilitated by oxygen vacancies at the heterojunction interface. This study can be applied to the design of novel n-n type metal oxide heterojunction materials for the application of low-temperature high-sensitivity TEA sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiaogang Guo,Taotao Liang,Binfang Yuan,Jing Wang
Developing the thermal stability of metal-based ceramic composites or their films has always been challenging and bottlenecks for the utilization of energy. In this paper, the novel mesh-like functional Al doped-MoO 3 nanocomposite film with even distribution and high purity was firstly fabricated by the high-efficiency electrophoretic deposition and surface modification. The optimal suspension turned out to be the mixture of isopropanol and the additives of polyethyleneimine and benzoic acid. The microtopography, crystalline structure, environmental resistance and thermal stability were analyzed by field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDX), X-ray diffractometer (XRD), exposure and droplet-impacting test, DSC analysis and ignition test, respectively. The water contact angle and sliding angle of product can reach ~170° and <1°, indicating the excellent anti-wetting property. In addition, the high heat-release (~3180 J/g) of product all kept almost unchangeable after six months exposure experiments, demonstrating the outstanding thermostability. The exquisite design idea here can perfectly match microelectromechanical system (MEMS), providing the valuable reference for fabricating other metal-based high-energy composites with long lifespan for real industrial applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wenhui Zhu,Ali Reza Kamali
Thermal oxidation in air of molybdenum disulfide (MoS 2 ) into layer structured molybdenum trioxide (α-MoO 3 ) is investigated using a combination of thermal analysis, electron microscopy , Raman, X-ray diffraction and photoelectron spectroscopy . The phase evolutions occurred during the thermal process is characterized by the surface oxidation of MoS 2 , followed by the bulk oxidation to form α-MoO 3 and the formation of Mo 17 O 47 at higher temperatures. The single-phase MoO 3 formed at optimum temperature condition is found to possess crystalline defects and considerably greater values of Li-ion storage cycling and rate performances in comparison with samples prepared at alternative temperatures and also the initial MoS 2 . This sample (P-MoO 3 -820) exhibits a charge capacity of 628 mA h g −1 after 250 cycles (100 mA g −1 ) with a Li + diffusion coefficient of 2.3 × 10 -13 cm 2 s −1 , substantially greater than that of initial MoS 2 (8.1 × 10 −16 cm 2 s −1 ). The electrochemical performance of P-MoO 3 -820 in full-cell configuration against a commercial LiFePO 4 cathode is evaluated and a specific capacity of 100 mAh g −1 after 500 cycles is recorded. This article, for the first time, discusses the thermal oxidation in air of MoS 2 as a simple and relatively clean approach to fabricate defective crystalline MoO 3 with enhanced Li-ion storage kinetics.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 29
·期 2
·1805227
·
IF 13.325
Gan Qu,Jun Wang,Guangyou Liu,Bingbing Tian,Chenliang Su,Zhesheng Chen,Jean-Pascal Rueff,Zhongchang Wang
Molybdenum trioxide (MoO 3 ) suffers from poor conductivity, a low rate capability, and unsatisfactory cycling stability in lithium-ion batteries. The aliovalent ion doping may present an effective way to improve the electrochemical performances of MoO 3 . Here, it is shown, by first-principle calculations, that doping MoO 3 with V by 12.5% can modulate significantly electronic structure and provide a small diffusion barrier for enhancing the electrochemical performance of MoO 3 . The ultralong Mo 0.88 V 0.12 O 2.94 nanostructures, which retain the h-MoO 3 structure and present an exceptionally high conductivity and fast ionic diffusion due to the substitution of V, facilitating lithiation/delithiation behavior, and induce a fine nanosized structure with a reduced volume change are prepared. As a result, the stress and strain are alleviated during the Li-ion intercalation/deintercalation processes, improving the cycling stability and rate capability. Such a large improvement in the electrochemical properties can be ascribed to the stabilizing effect of V, the small migration energy barrier, and short diffusion path, which arise from the introduction of V into MoO 3 . The unique engineering strategy and facile synthesis route open up a new avenue in modifying and developing other species of electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 6
·1124
·
IF 4.324
Wan Zhao,Xin Liu,Xiuru Yang,Chunxi Liu,Xiaoxiao Qian,Tao Sun,Wenya Chang,Jingjing Zhang,Zhi Chen
Metallic 1T-phase MoS2is a newly emerging and attractive catalyst since it has more available active sites and high carrier mobility in comparison with its widely used counterpart of semiconducting 2H-MoS2. Herein, 1T/2H-MoS2(N) (N: MoO3nanowires were used to prepare 1T/2H-MoS2) was synthesized by using molybdenum trioxide (MoO3) nanowires as the starting material and applied in the photodegradation of antibiotic residue in water. Enhanced photocatalytic performance was observed on the obtained 1T/2H-MoS2(N), which was 2.8 and 1.3 times higher than those on 1T/2H-MoS2(P) (P: commercial MoO3powder was used to prepare 1T/2H-MoS2) and 2H-MoS2, respectively. The active component responsible for the photodegradation was detected and a reaction mechanism is proposed.Keywords:1T/2H-MoS2composite;molybdenum trioxide nanowires;photodegradation of antibiotic residue;hydrothermal method
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2024
·
IF 8.3
Peng Xiang,Congming Tang,Kai Ma,Xinli Li
Interfacial evaporation of seawater and other wastewater is used to produce clean water by the infinite solar energy which attracts an intense interest and displays a great prospect. An efficient and robust photothermal evaporator is a key to solar-driven interfacial evaporation. Herein, the oxygen vacancy-rich MoO 3 aerogel evaporator is designed to purify seawater and wastewater. Hydrogen etching is used to construct oxygen vacancies of MoO 3 , which regulate its optical and thermophysical properties. MoO 3 * possesses stronger broadband absorption and lower reflectance than MoO 3 across the wavelength ranges of 200 nm–2500 nm, which insures more energy input. Besides, band gap energy of MoO 3 * decreases from 2.90 eV of MoO 3 to 1.92 eV, which is more beneficial for the visible light absorption and its degradation of organic pollutant. As a result, the MoO 3 *-based evaporator displays a higher evaporation rate of 1.78 kg m −2 h −1 as well as 92.6 % of efficiency for pure water at 1 sun illumination, in contrast to the MoO 3 -based evaporator with an evaporation rate of 1.04 kg m −2 h −1 and 60.0 % efficiency, suggesting that oxygen vacancies induced by hydrogen etching improve photothermal conversion efficiency. In practical application, the MoO 3 *-based evaporator also displays an excellent purification performance for seawater, heavy metal wastewater and tetracycline wastewater, in which the evaporation rates are close to pure water, and the quality of the purified water is better than drinking water specified by WHO standard. In addition, the defected MoO 3 *-based aerogel evaporator not only possesses an excellent thermal management, but also offers an excellent salt self-cleaning ability. This work convincingly demonstrates that the “defect chemistry” is perfect for constructing the defected MoO 3 * aerogel evaporator for sustainable production of clean water from seawater, heavy metal wastewater and tetracycline wastewater by means of the solar-driven interfacial evaporation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 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）