INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiuxiu Ren,Fukang Shi,Meng Guo,Jing Zhong,Rong Xu,Zheng Yao,Dongliang Jin,Ting Qi,Liang Zhou
Two-dimensional (2D) molybdenum disulfide (MoS2) with a unique action on H2 was incorporated into 1,2-bis(triethoxysilyl)ethane (BTESE)-derived bridged microporous organosilica networks to form a composite membrane for H2 separation by a sol–gel method. Due to their opposite ζ-potentials, a continuous surface without lamellar boundary defects was formed between BTESE sols derived by the hydrolysis–polymerization reaction and MoS2 nanosheets. When the MoS2 content increased in BTESE networks, the H2 permeance showed an overall increasing trend in the range of 1.85–2.89 × 10–7 mol·m–2 s–1 Pa–1 (552–864 GPU), which was higher than that of pristine BTESE membrane with the H2 permeance of 491 GPU. In addition, optimized MoS2/BTESE membranes showed a much higher H2/N2 permselectivity of 129 than that of the pristine BTESE membrane of 17 at 100 °C. The synergistic effect of BTESE and MoS2 nanosheets plays an important role. Through adsorption isotherm test and diffusivity as well as energy calculation, BTESE networks became denser by nonporous MoS2 addition that prevented N2 from passing, while H2 was promoted with excellent adsorption on charged edges of MoS2, resulting in improved H2 separation performance both in permeance and selectivity. This provides an attractive mechanism for hydrogen separation.
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
Environmental Science-Nano
·
2024
·
IF 5.8
Mengxia Wang,Meng Zhang,Qi Han,Yufei Shu,Xun Liu,Beizhao Chen,Yuchao Chen,Bei Liu,Zhongying Wang
Mercury (Hg) contamination in groundwater poses significant environmental and health risks, necessitating effective remediation strategies. Recently, molybdenum disulfide (MoS2) nanosheets have emerged as a promising nanomaterial for the remediation of Hg-associated contaminated groundwater. However, the complex interactions between ubiquitous natural organic matter (NOM) and MoS2 may play a significant role in controlling the removal of Hg from groundwater. In this study, we investigated the mechanisms underlying the role of NOM in Hg(II) removal by MoS2. Our findings demonstrated that NOM inhibited the Hg(II) removal by MoS2 from groundwater at a high molar ratio of Hg/MoS2. However, at a low molar ratio of Hg/MoS2, NOM hardly affected the removal performance of MoS2 on Hg(II) because NOM was unable to compete with sufficient MoS2 to complex with Hg(II). The inhibitory effect of NOM on Hg(II) removal was found to be determined by both the molecular weight (MW) and functional groups of NOM: the NOM fraction with higher MW exhibited a higher degree of inhibition, and the –SH groups displayed preferential binding of Hg(II) rather than the –COOH group. It was concluded that the reduction of MoS2 to Hg(II) gradually decreased with increasing addition of NOM, attributed to NOM complexation with Hg(II). Overall, this study provides insights into the significance of NOM characteristics in controlling the removal of Hg(II) from groundwater.
研究领域:
环境科学
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 60
·35189-35196
·
IF 3.049
Yi-Wei Cui,Hai-Huan Zhang,Shi-Yong Yu
Efficient C–ZnS/ZnMoO4@MoS2 and C–ZnS/MoS2 nanocomposite photocatalysts, using ZIF-8 derived C–ZnO as a precursor were successfully synthesized using a simple one-pot procedure. This is the first application that involves transforming ZIF-8 into C–ZnMoO4 for photocatalysis. The C–ZnS/ZnMoO4@MoS2 and C–ZnS/MoS2 heterostructures were characterized by X-ray diffraction, UV-vis, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, photocurrent measurements, scanning electron microscopy and transmission electron microscopy. The ZM2 sample of C–ZnS/ZnMoO4@MoS2 exhibited enhanced photocatalytic activity of about 2.9 times as high as that of ZIF-8 derived C–ZnO in the reduction of tetracycline hydrochloride, and also showed obvious photocatalytic activity 1.81 and 3.33 times as high as that of a ZM3 sample of C–ZnS/MoS2 and ZIF-8 derived C–ZnO in the degradation of RhB, respectively. The improved photodegradation activity is a result of the heterogenous structure and the tighter contact between C–ZnS and C–ZnMoO4 compared with the physical contact of general heterogenous photocatalysts. The C–ZnS/ZnMoO4@MoS2 heterostructure photocatalyst is expected to be a new type of nanomaterial for the degradation of pollutants from wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Zexiao Zheng,Xukai Li,Laisheng Li,Yiming Tang
Quaternary semiconductor film consists of ZnO, ZnSe, CdSe and MoS 2 was designed to establish a core-shell structure to achieve the photoelectrochemical oxidation of amoxicillin . The hybrid photoelectrode was fabricated on a FTO substrate from bath deposition methods . The hierarchical ZnSe/CdSe/MoS 2 shell was covered uniformly on ZnO nanorod core which provided a direct pathway for electron transfer , large surface area to enhance light absorption and increase active sites. The quaternary photoelectrode exhibited a photocurrent density of 26.86 mA/cm 2 at 0 V vs. Ag/AgCl under UV–visible light illumination, which was 31.9 times, 16.7 times and 1.6 times of that of the bare ZnO nanorods, binary ZnO/ZnSe and ternary ZnO/ZnSe/CdSe photoelectrodes, respectively. 10 ppm of amoxicillin was completely degraded in 30 min by the quaternary working electrode with an applied bias of 0.5 V vs. Ag/AgCl. The reusability and stability of quaternary electrode was demonstrated by 3-run recycling experiments. The enhanced photoelectrochemical performance of quaternary photoelectrode can be attributed to the enhancement of light absorption and increased active sites from the coverage of visible-active layers, the accelerated charge separation from the formation of p-n junction and reduced photocorrosion of CdSe from the protection of MoS 2 on the surface.
研究领域:
环境科学
·
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2016
·Vol. 6
·期 11
·151
·
IF 2.075
Di Wu,Han Huang,Xupeng Zhu,Yanwei He,Qiliang Xie,Xiaoliu Chen,Xiaoming Zheng,Huigao Duan,Yongli Gao
Molybdenum disulfide (MoS2) has recently attracted considerable interests due to its unique properties and potential applications. Chemical vapor deposition (CVD) method is used widely to grow large-area and high-quality MoS2single crystals. Here, we report our investigation on thermal strain-fractured (SF) single crystalline MoS2, oxidation-fractured MoS2, and normal MoS2by atomic force microscopy (AFM), Raman and photoluminescence (PL) measurements. Several new Raman modes are observed for SF-MoS2. The band gap of SF-MoS2is enlarged by 150 meV and the PL intensity is reduced substantially. These results imply that a structural transformation occurs in SF-MoS2. Our findings here are useful for the design of MoS2-based nanocatalysts with relative high catalytic activity.Keywords:thermal strain-fractured MoS2;defect;Raman spectrum;photoluminescence spectrum;structural transformation
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 6
·3519-3527
·
IF 1.093
Teng Wei,Wang Youmei,Lin Qin,Zhu Hui,Tang Yubin,Li Xinyong
Molybdenum disulfide (MoS2), as a typical layered transition metal sulfide, has been widely used in photocatalysis. Here, we report layered MoS2 nanosheet-coated TiO2 heterostructures that were prepared using a simple photo-assisted deposition method.
The as-prepared samples were investigated in detail by using X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Results demonstrated that the MoS2 nanosheets uniformly covered the outer surface
of TiO2. The visible light-sensitive photocatalytic activity was evaluated by the removal of methylene blue (MB) and 2-chlorophenol (2-CP) in aqueous solution. Thus, the MoS2/TiO2 heterostructures exhibited improved photocatalytic degradation activity under
visible light compared with the pure TiO2. Under visible light irradiation for 90 min, the degradation efficiencies of MB and 2-CP over the MoS2/TiO2 sample (sunlight irradiation time: 30 min) are as high as 93.6% and 70.6%, respectively. Furthermore, the corresponding
mechanism of enhanced photocatalytic activity is proposed on the basis of the comprehensively investigated results from the radical trapping experiments, photoluminescence spectroscopy, and electron spin resonance analysis. The hole oxidation, hydroxyl radicals, and superoxide anion radicals
act as the active species simultaneously in the photodegradation of the dye molecules. However, of these species, hole oxidation played the most important roles in the photocatalytic reaction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Dali Wang,Fangming Wu,Yiheng Song,Chan Li,Li Zhou
Two dimensional (2D) layered MoS 2 nanosheets are gaining increasing attention due to their attractive properties associated with myriads potential applications. However, large-scale production of high-quality MoS 2 nanosheets in a simple manner remains a big challenge. Herein, we present a facile approach for scalable production of defect-free MoS 2 nanosheets by direct ultrasonication exfoliation of bulk MoS 2 crystals in ethanol in the presence of pyrene. Our findings indicate that the pyrene can not only serve as an exfoliating agent to significantly accelerate the exfoliation process but also endow the resulted MoS 2 nanosheets with excellent solution dispersibility and stability. The obtained MoS 2 nanosheets are highly crystalline and exhibit superior electrical properties as compared with the bulk MoS 2 . In addition, the MoS 2 nanosheets can also be employed as nanofillers to enhance the mechanical properties of polymers. Moreover, this method can also be extended to exfoliation of other 2D layered transition metal dichalcogenide as demonstrated by the exfoliation of bulk WS 2 crystals in this study. This work thus brings more opportunities for the investigation and applications of 2D layered inorganic nanosheets.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 1
·228-238
·
IF 3.591
Xinyu Liu,Jing Xu,Lijun Ma,Ye Liu,Linying Hu
The construction of heterojunctions can effectively improve the electron transport rate and photocatalytic activity. In this work, nanoflower-like S-scheme heterojunction MoS2/NiAl-LDH was successfully synthesized. The results indicated that the hydrogen yield of the MoS2/NiAl-LDH composite catalyst reached 229.5 μmol in 5 hours under visible light irradiation by adjusting the pH value of the sacrificial agent and the amount of eosin. The crystal structure and morphological characteristics of the composite were analyzed by XRD, SEM and TEM. The visible light response degree and charge separation and transfer rates of photogenerated carriers of the composite were analyzed by UV-Vis DRS, PL and electrochemistry. The electronic transfer path was also analyzed by XPS. The construction of S-scheme heterojunctions can realize effective separation of electron–hole pairs and ensure that the photo-induced carriers with the strongest redox ability can be retained to participate in the photocatalytic reaction. In addition, the feasible mechanism of photocatalytic hydrogen evolution is given. This work will provide different insights into the enhancement of hydrogen evolution by heterojunctions formed by binary semiconductors.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2016
·
IF 1.458
Song Hao,Bingchu Yang,Jingye Yuan,Yongli Gao
Monolayer MoS 2 is an emerging two-dimensional semiconductor with wide-ranging potential applications in the next generation electronic and optoelectronic devices. Understanding the influences of the supporting substrates on the physical properties of grown MoS 2 is an important step toward its applications. Here we synthesized two typical rhomboid shaped MoS 2 on MoO 2 and triangle shaped MoS 2 on SiO 2 /Si substrates and characterized them by multiple means of X-Ray Photoemission Spectroscopy, Atomic Force Microscopy , Electrostatic Force Microscopy, Raman and Photoluminescence techniques. We found that triangle shaped MoS 2 exhibits different core level spectra compared with rhomboid shaped MoS 2 , attributed to dissimilar charge transfer with the underlying SiO 2 substrate. Interestingly, the triangle shaped MoS 2 single crystals exhibit distinct electrostatic and photoluminescence properties at center and edges. The underlying mechanism is proposed that partial decoupling of MoS 2 at edges from SiO 2 substrate induces different doping level and strain effects, resulting in anomalous physical properties at edges. The results reported here demonstrate that doping and strain effects induced by substrates have a significant influence on physical properties of monolayer triangle shaped MoS 2 ，which can be generally applicable to other transition metal dichalcogenides materials.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yue Cai,Huan Kang,Fengxing Jiang,Liming Xu,Yao He,Jingkun Xu,Xuemin Duan,Weiqiang Zhou,Xinyu Lu,Quan Xu
Hierarchical structural PEDOT@MoS 2 nanocomposite is synthesized via a facile electrochemical co-deposition of the intercalation of PEDOT into flower-like MoS 2 microspheres. The SEM, TEM, and other characterization results demonstrate the hierarchical PEDOT@MoS 2 composite with an enlarged interlayer spacing of MoS 2 to 1.02 nm, in which PEDOT nanoparticles act as intercalation, and flower-like MoS 2 microspheres are used as a substrate for growth. The electrochemical characterizations indicate that the PEDOT@MoS 2 electrode has an ultra-high specific capacitance of 4418 mF cm −2 at 2 mA cm −2 and remarkable cycling stability, retaining 100% of the initial capacitance at a high current density of 100 mA cm −2 after 10,000 cycles. The symmetric PEDOT@MoS 2 supercapacitor presents a high energy density of 88.3 mWh cm −2 at 60 mW cm −2 , and outstanding cycling stability (93% after 10,000 cycles). These prominent electrochemical performances are attributed to the expanded interlayer spacing, the synergistic effect between PEDOT and MoS 2 , the low resistance, along with the PEDOT@MoS 2 porous structure, indicating great potential applications of the PEDOT@MoS 2 electrode in the energy storage field.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Qingmiao Wang,Feifei Jia,Anhua Huang,Yi Qin,Shaoxian Song,Yanmei Li,Mario Alberto Corona Arroyo
A novel three-dimensional (3D) MoS 2 -based evaporator (MPU-PPU) was constructed for solar desalination in this work. This evaporator provided a typical design of double layer structure (DLS): the top layer which was formed via embedding nanoscale MoS 2 onto frameworks of 3D porous polyurethane (PU) sponge, played the role of solar absorbing and photothermal conversion , while the bottom layer which was originated from PU sponge with the hydrophilic PDA coating, functioned as the thermal insulation layer and water pump. With low cost, facile construction pathway and good mechanical flexibility, the MPU-PPU evaporator simultaneously exhibited high evaporation efficiency of 85% under a low illumination of 1.0 kW m −2 and superhigh evaporation efficiencies over 90% under higher solar illumination (1.5–2.5 kW m −2 ), which outperformed many other reported advanced materials for solar desalination . The four factors: (1) high photothermal efficiency, (2) localized heating effect, (3) hydrophilic bottom layer to leverage capillary forces and promote fluid flow to the hot region, together with (4) the porous structure which enabled efficient water supply and vapor channel, mainly accounted for the high-efficiency solar desalination. Besides, the MPU-PPU evaporator exhibited the outstanding desalination efficiency and excellent recyclability , providing great potential in its commercial use for solar desalination.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Hsun-Yen Lin,Jyh Ming Wu
Hydrogen (H 2 ) is mainly produced using steam methane reforming, electrolysis, and gasification, which require external energy and special catalysts. A new catalyst by combining MoS 2 nanoflowers (NFs) with metal carbide/nitride nanosheets (Mo 2 CTx MXene) to create a nanosheet bending moment. The MoS 2 @Mo 2 CT x heterostructures achieve a production rate of 1164.8 µmol g −1 h −1 under an application of mechanical force, 4.01 and 3.06 times higher than Mo 2 CTx and MoS 2 alone, due to enhanced charge transfer from MoS 2 's piezoelectricity and Mo 2 CT x 's conductivity. This study introduces a pioneering methodology that harnesses gravitational energy as a continuous mechanical force, simulated using a peristaltic pump, to drive the piezocatalytic hydrogen evolution reaction (HER), achieving a notable hydrogen production rate of 454.1 µmol g −1 over 24 hours and demonstrating a sustained capability for hydrogen generation. The theoretical calculation results validate the piezoelectric potential in water-flow-pressure triggered HER systems. The piezocatalytic HER system, assuming powered by the Hoover Dam, will produce 290.9 kmoles of hydrogen per ton daily, equivalent to utilizing 19 150 kWh of energy in the electrocatalytic system. The simulated gravity-driven water flow using MoS 2 @Mo 2 CT x piezocatalysts for H 2 generation demonstrates superior efficiency by eliminating common thermal energy conversion losses, marking a significant breakthrough in sustainable hydrogen production technologies.
研究领域:
材料科学
·
可再生能源
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）