INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Shen Zhang,Yaxian Qiao,Shiwei Luo,Bingbing He,Jingliang Xu
We reported a bifunctional site-isolated Lewis acid-Brønsted base metal-organic frameworks (NH 2 -Mo-MIL-101(Al)) for selective epimerization and isomerization of glucose to mannose and fructose. The yields of mannose and fructose were 34.09 % and 19.25 %, respectively, at 120 °C for 40 min. The sum selectivity of mannose and fructose was 95.64 %. System characterization showed that the excellent catalytic performance may attribute to the synergistic effect of Lewis acid (MoO 2 and MoO 3 ) sites and Brønsted base (-NH 2 ) sites on NH 2 -Mo-MIL-101(Al). The composition of the catalyst before and after catalysis experiment was characterized by ICP-MS. Results showed that no Mo specie was leached from NH 2 -Mo-MIL-101(Al) after 5 times re-used. 97 % of catalytic efficiency was retained after 5 times reusing compared to origin NH 2 -Mo-MIL-101(Al). The N-Mo chemical bonding between Mo active sites with NH 2 -MIL-101(Al) skeleton enhanced the hydro-stability and hydrothermal cyclic stability. Notably, 94.13 % of total sugar recovery was achieved from reaction solution by sample crystallization process without requiring chromatographic separation. High purity of glucose (91.27 %) and mannose (88.53 %) were recovered from reaction solution. This study provided a green and feasible catalytic and recovery process for industrial production of high-yield mannose and fructose from glucose.
研究领域:
化学工程
·
生物化学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Meifei Chen,Xiunan Cai,Qing Yang,Wenqin Lu,Zuqiang Huang,Tao Gan,Huayu Hu,Yanjuan Zhang
To improve the photocatalytic performance of g-C 3 N 4 (CN), mechanical activation (MA) treatment of precursor followed by calcination was developed to construct a N−Mo−O bond bridged MoO 2 /Mo-doped CN (MA-MoO 2 /Mo-CN) Schottky heterojunction composite, which was used as a visible light-driven photocatalyst for degrading tetracycline (TC). The as-prepared MA-MoO 2 /Mo-CN with strong interfacial interaction showed excellent photocatalytic performance and structural stability, with 92.3% of TC degradation efficiency within 90 min and maintaining over 90% of degradation efficiency after five consecutive cycles. The enhanced photocatalytic performance can be ascribed to that MA treatment induced the improvement of surface area and the formation of N vacancies and N−Mo−O bonds, which served as a bridge to connect Mo-CN and MoO 2 for constructing a Schottky barrier. These provided more reactive sites and effectively enhanced migration efficiency of interface electrons, separation efficiency of photogenerated carriers, and light absorption capacity. In addition, the mechanism of photocatalytic degradation of TC and its possible degradation pathway were investigated. This research provides an environmentally friendly and feasible method for producing highly active precious metal-free photocatalysts with excellent migration and separation efficiency of photoexcited charge carriers.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wenjing Li,Xuelin Dong,Lihua Zhu,Heqing Tang
It is urgently needed to develop highly efficient and selective adsorbents for enrichment and separation of Re(VII) from Mo(VI) to obtain metallic rhenium. By tuning cross-link of chitosan, ionic gel capsules (CSN) were prepared, which had a core-shell structure and wrapped N263 (methyl trioctyl ammonium chloride) as an extractant. After being characterized, the CSN capsules were used as a green adsorbent for separation of ReO 4 − from MoO 4 2− . It was found that the gel yielded good adsorption capacities for Re(VII) in a wide pH range from pH 2 to 12. The adsorption of Re(VII) on the gel followed the Langmuir model, exhibiting a maximum adsorption capacity of 222 mg g −1 for Re. The adsorbent showed good adsorption capacities for Mo(VI) at pH < 2, but little at pH > 3.5. Therefore, the enrichment and separation of Re(VII) from Mo(VI) could be easily achieved by using the gel adsorbent in a wide pH range from 4 to 12, showing a separation factor β Re/Mo with values of 10 3 –5 × 10 4 . A mechanism was proposed for the selective adsorption of Re(VII). The extractant N263 wrapped in the capsule core provides excellent extractive adsorption ability for Re(VII) through ion association extraction, generating ion association complex R 4 N + ∙ReO 4 − in the adsorbent. The gel shell was composed of cross-linked chitosan induced by sodium tripolyphosphate, and functioned as a blocking layer for the adsorption of Mo(VI), being possibly related to a special interaction between Mo and P as observed in the formation of phosphorus molybdenum heteropolyacid and/or the crosslinking with Mo and chitosan. The CSN gel was successfully applied to separate ReO 4 − from a practical alkaline solution.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Wei Liu,Yaxuan Li,Yuanxin Dou,Nuo Xu,Jiajia Wang,Jiangtao Xu,Chuanming Li,Jingquan Liu
Designing cost-effective alkaline hydrogen evolution reaction (HER) catalysts with high water dissociation ability, enhanced hydroxyl transfer rate and optimized hydrogen adsorption free energy (ΔG H* ) by a time and energy efficient strategy is pivotal, but still challenging for alkaline water electrolysis. Herein, Pt/Mo-NiO x hybrid consisting of Pt clusters assembled on Mo-doped NiO x nanosheet arrays is prepared on the surface of raw NiMo foam (NMF) by a light-driven strategy to address this challenge. Benefitting from the electronic interaction between Mo-NiO x and Pt, the Pt/Mo-NiO x composite owns optimized ΔG H* and is beneficial for accelerating water dissociation and hydroxyl transfer. As a result, the optimized Pt/Mo-NiO x /NMF electrode displays an exceptional alkaline HER activity with a low overpotential of 62 mV to obtain 100 mA cm −2 and a high Pt mass activity (13.2 times as high as that of commercial 20 wt% Pt/C). Furthermore, the assembled two-electrode cell of Pt/Mo-NiO x /NMF||NiFe-LDH/NF requires a voltage of only 1.549 V to deliver 100 mA cm −2 , along with negligible activity decay after 70 h stability test. The present study provides a promising strategy for exploiting high-performance electrocatalysts towards alkaline HER.
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高影响因子
BIOTECHNOLOGY PROGRESS
·
2022
·Vol. 38
·期 4
·e3256
·
IF 2.909
Duanhao Wang,Meijing Guo,Jiachen Li,Binglin Li,Jiao Wang
Six kinds of Mo-basing nanomaterials (MoO 3 , MoO 3 @Ru, Mo-PDA, MoP C , MoP, CNT@MoS 2 ) were successfully synthesized, which were employed as carriers to immobilize phospholipase A 1 (PLA1) for the hydrolysis of phospholipids (PLs). PLA1 was immobilized by a simple adsorption-precipitation-cross-linking to form an “enzyme net” covering on nanoparticles. The greatest advantage of these nanoparticles was their strong hydrophilic surface. It not only permitted their dispersion in the aqueous phase, but also showed the strong affinity for PLs in the organic phase, because amphiphilic PLs had the polar head group and higher hydrophilicity than other oils components. Michaelis–Menten analysis revealed that higher catalytic activity and enzyme−substrate affinity were observed in several immobilized PLA1 than its free form. MoO 3 was confirmed to be the best candidate for carrier. The highest specific activity of MoO 3 -immobilized PLA1 reached 43.1 U/mg, which was about 1.8 times higher than that of free PLA1 (24.4 U/mg). In addition, the stability and recycling were also enhanced. The robust immobilized PLA1 was prepared in this work, showing great potential for the enzymatic degumming.
研究领域:
生物化学
·
纳米生物学
·
食品科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Guimiao Wang,Peilin Ran,Jingfei Guan,Baifei Wu,Shuo Wang,Min Liu,Hang Yang,Meilin Chen,Danmei Yu,Bin Zhang,Liyong Gan,Xiaoyuan Zhou
Although rechargeable magnesium batteries (RMBs) offer high volumetric energy density and intrinsic safety, their practical application and development are severely hindered by the sluggish diffusion of Mg 2+ ions due to the strong electrostatic interaction with host structure of cathode materials. Herein, a Mo-doped vanadium disulfide (MVS) has been developed to improve Mg 2+ diffusion and promote development of RMBs. Research results confirm that doping an appreciate amount of Mo can expand the interlayer spacing of (001) crystal plane in vanadium disulfide (VS 2 ), induce rich defects, and improve its surface area and electronic conductivity, thus facilitating the diffusion of Mg 2+ and electrode reaction kinetics. Consequently, the battery Mg//MVS delivers a discharge capacity of 292.5 mAh g −1 at current density of 100 mA g −1 and excellent rate capability. Moreover, it can also charge and discharge stably 1400 cycles at 1000 mA g −1 with near 100% Coulomb efficiency. In addition, electrochemical and ex situ characterizations confirm that doping Mo does not change the cathode reaction mechanism but significantly increases the diffusion coefficient of Mg 2+ ions, and improves structural stability and reaction reversibility during charge-discharge. This work establishes a viable structural-regulation strategy for developing high-performance cathode of RMBs and also proposes some fundamental insights into modulation mechanism of next-generation multivalent ion storage systems.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Jinghua Shang,Minggang Zhao,Huiyan Qu,Hui Li,Shougang Chen
We proposed a new method for regulating the electrochemical signal by using Schottky barrier . The results show that the height of Schottky barrier can be altered by adsorbing charged substance to control the enhancement and attenuation of electrochemical signal. The Schottky interface formed by MoS 2 and CQDs (carbon quantum dots) can achieve the selective detection of dopamine and overcome the distraction of ascorbic acid and uric acid with similar redox signal. The combination of Schottky barrier and electrochemical detection enhance the sensitivity and selectivity of electrochemical sensor significantly. It is a new strategy for improving electrochemical detection by introducing Schottky barrier into electrochemical process.
研究领域:
电化学
·
纳米材料
·
传感器
·
分析化学
·
材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Sha Long,Yanghang Liu,Jingxing Gui,Yuting Xue,Yuxuan Ma,Baojiang Liu,Chunyan Hu,Dan Yu,Wei Wang
One-step thermal-initiated polymerization to prepare light-responsive hydrogels • Achieve independent and reversible control of color change and fluorescence emission • The hydrogel achieves information encryption/decryption functions. Developing low-cost and straightforward strategies for integrating photochromic materials with fluorescent components is essential for next-generation information encryption. In this work, we present a facile fabrication of a photo-responsive fluorescent hydrogel by employing ammonium molybdate tetrahydrate (Mo) as the photochromic agent and fluorescein-o-acrylate (Fa), a monomer bearing a carbon–carbon double bond, as the fluorescent building block. Fa is covalently polymerized into the polyacrylamide (PAM) backbone, while Mo is anchored to the three-dimensional gel network via multiple hydrogen bonds. Upon exposure to a 365 nm UV source, PPM 3 F 3 G displayed a maximum emission peak at 547 nm, emitting visible yellowish-green fluorescence. After 60 s of continuous irradiation, the original fluorescence superimposed with the photochromic blue background produced a green fluorescence perceptible to the naked eye. Notably, the coloration process induced by prolonged UV irradiation does not cause fluorescence quenching, and both optical modalities exhibit outstanding cyclic stability and high reversibility. By integrating PPMFG with ASCII code and other innovative anti-counterfeiting platforms, we successfully develop highly secure encryption modes that resist counterfeiting. Download: Download high-res image (129KB) Download: Download full-size image
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bin Liu,Xin-Yu Zhang,Tian-Shu Chen,Li-Ming Zhang,Xin-Lei Yang,Xue Ma,Di Liu
The development of stable and active electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of significant importance toward overall water splitting related with the conversion of sustainable energy sources. Herein, we report the synthesis of molybdate-directed Ni 3 S 2 heterogeneous nanorod arrays, in which the nanorods decorated with vertical nanosheets were densely and evenly covered on the surface of Ni foam. Benefiting from the abundant accessible active sites, accelerated charge transport, fast release of generated gas, and synergistic effect, the Mo doped Ni 3 S 2 nanorod arrays exhibits excellent activity toward both OER and HER, delivering current density of 100 mA.cm -2 at low overpotential of 350 mV for OER and 290 mV for HER, respectively. Moreover, such heterogeneous nanorods display a very low cell voltage of 1.83 V to approach 100 mA.cm -2 along with a favorable robustness for 10 h in an alkaline electrolyzer. Different characterizations including XRD and SEM revealed the influence of Mo doping on the growth of heterogeneous nanorods. Electrochemical measurements confirmed the superior activity of Mo doped Ni 3 S 2 originated from synergistic effect of Mo and Ni 3 S 2 . This work sheds light on the fabrication of versatile electrocatalysts for efficient energy conversion by demonstrating the novel design of heterogeneous nanorods as active catalysts.
研究领域:
材料科学
·
电化学
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MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Weiqiang Hu,Jun He,Zhenwen Yang,Jing Tan,Songhua Chen,Shaocun Liu,Zongqing Ma,Yongchang Liu
The little TiC was added into Mo alloys by facile ball milling and subsequent sintering. Interestingly, ultrafine Mo-TiC alloy (6.53 μm) possesses quasi-cleavage transgranular fracture morphology, which is differed from traditional intergranular fracture morphology of oxide-dispersion-strengthened molybdenum (ODS-Mo) alloy. The alloy interface with the lowest strength changes from Mo grain boundaries (GBs) to grain interior, hence the crack propagates along grain interior. For one thing, some C-deficient TiC (Ti 8 C 5 ) can adsorb adjacent impurity oxygen at sintering stage to generate in-situ TiO x , thereby purifying Mo matrix. For another thing, coherent interfaces between TiC/TiO x particles and Mo further strengthen Mo matrix. Moreover, a lot of TiC/TiO x particles within Mo grains could efficaciously accumulate dislocations and indirectly improve GBs strength. Compared to ball-milled Mo or ODS-Mo alloy reported in literatures, the sintered Mo-TiC alloys in present work possess a high hardness (468 HV 0.2 ), an excellent match of high strength (1287.3 MPa) and large ductility (18.1%).
研究领域:
材料科学
·
冶金学
·
机械工程
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 3
·e202200313
·
IF 1.8
Xiang-Dong Meng,Shui-Zhou Cai
In this study, the Al-B-Mo alloy powders with a boron content of 7 wt % and Molybdenum content of 0.5–3 wt % were prepared by the close-coupled gas atomization. The powder morphology, phase composition, oxidation, and exothermic behavior of combustion were characterized. The results show that the addition of Mo effectively improves the energetic properties of the alloy powder, with the mass-burning enthalpy of Al-7B-1Mo reaching 31111 J/g, exceeding the theoretical mass-burning enthalpy of monolithic Al (31000 J/g). Al-7B-1Mo underwent a violent exothermic process at around 1000 °C, and the oxidation weight gain ratio and oxidation efficiency reached 46.16 % and 48.05 % respectively, an increase of 19.75 % and 21.08 % compared to Al-7B. The mesh structure formed by the AlB 2 phase on the particle surface positively promoted the particles′ thermal oxidation. Mechanical mixtures of AlB 2 /Mo and AlB 2 /MoO 3 were prepared and the catalytic promotion of the combustion of AlB 2 by Mo and MoO 3 was confirmed by thermal tests of combustion. The mechanism by which Mo/MoO 3 promotes the combustion of AlB 2 was investigated through the phase composition characterization of the composite powder after heat treatment in argon and air atmosphere. It was confirmed that MoO 3 promotes the oxidation and combustion of AlB 2 by supplying oxygen to B in AlB 2 , while Mo is first oxidized to MoO 3 , which then promotes the combustion of AlB 2 .
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Small
·
2023
·
IF 13.3
Shuyang Peng,Di Liu,Keyu An,Zhiqin Ying,Mingpeng Chen,Jinxian Feng,Kin Ho Lo,Hui Pan
Green hydrogen is considered to be the key for solving the emerging energy and environmental issues. The photoelectrochemical (PEC) process for the production of green hydrogen has been widely investigated because solar power is clean and renewable. However, mass production in this way is still far away from reality. Here, a Si photoanode is reported with CoO x as co-catalyst for efficient water oxidation. It is found that a high photovoltage of 350 mV can be achieved in 1.0 m K 3 BO 3 . Importantly, the photovoltage can be further increased to 650 mV and the fill factor of 0.62 is obtained in 1.0 m K 3 BO 3 by incorporating Mo into CoO x . The Mo-incorporated photoanode is also highly stable. It is shown that the incorporation of Mo can reduce the particle size of co-catalyst on the Si surface, improve the particle-distribution uniformity, and increase the density of particles, which can effectively enhance the light absorption and the electrochemical active surface area. Importantly, the Mo-incorporation results in high energy barrier in the heterojunction. All of these factors are attributed to improved the PEC performance. These findings may provide new strategies to maximize the solar-to-fuel efficiency by tuning the co-catalysts on the Si surface.
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