ACS Applied Nano Materials
·
2022
·
IF 6.14
Luyao Wang,Zhe Bai,Xiangwen Zhang,Guozhu Li
Hydrodesulfurization (HDS) is an important technique that is widely adopted in the petroleum industry to remove harmful sulfur compounds for environmental protection. MoS2 is the most commonly employed HDS catalyst but tends to stack due to its high surface energy. Active MoS2 nanosheets are anticipated to be well supported for preventing aggregation and increasing accessibility. In the current study, two-dimensional Ti3C2 MXene is utilized as a novel support to controllably anchor MoS2 nanosheets for efficient HDS. The composite of Ti3C2-supported CoMoS2 (CoMoS2/Ti3C2) with a 3D interconnected network was successfully constructed by a facile, one-step hydrothermal method. Detailed characterizations showed that MoS2 nanosheets vertically grew in situ on and between the layers of Ti3C2 MXene. CoMoS2/Ti3C2 possesses a well-defined open structure with a larger specific surface area and a higher proportion of CoMoS active phase compared with unsupported CoMoS2. As catalyzed by CoMoS2/Ti3C2, the reaction rate constant was effectively increased to 2.8 times that on CoMoS2 for the HDS of dibenzothiophene. CoMoS2/Ti3C2 also showed good stability in a harsh high-temperature reaction environment.
研究领域:
材料科学
·
催化化学
·
能源化工
✓ 已验证
DOI
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
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Meng-Qi Ma,Chao Zhang,Cheng-Ye Zhu,Sheng Huang,Jing Yang,Zhi-Kang Xu
Two-dimensional (2D) nanosheets have attracted extensive attention and have been considered as compelling nanofillers of polyamide-based nanofiltration membranes (NFMs) with thin film nanocomposite (TFN) frame. However, there still remains a big challenge, the poor compatibility between these 2D nanofillers and the polyamide matrix, significantly restricting their practical applications. Herein, we present TFN NFMs by incorporating tannic acid (TA) functionalized molybdenum disulfide (MoS 2 ) nanosheets into the polyamide skin layers via typical interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC). TA was employed to assist the aqueous exfoliation of bulk MoS 2 into 2D nanosheets, and simultaneously served as the functional molecule to modify and stabilize the as-exfoliated MoS 2 nanosheets in aqueous solutions. Thanks to the contribution of TA, the MoS 2 nanosheets can be covalently linked into the skin layers through the reaction of TA and TMC, thus exhibiting excellent compatibility with polyamide matrix. Besides, the as-prepared TFN NFMs show promoted water permeation as high as 17.0 L/m 2 ⋅h⋅bar without compromising the salt rejection of divalent ions (98.5%). Moreover, these high-performance TFN NFMs also possess outstanding long-term stability, with great implication for the practical applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2016
·Vol. 49
·期 31
·315304
·
IF 2.772
Xiaohui Ren,Xiang Qi,Yongzhen Shen,Si Xiao,Guanghua Xu,Zhen Zhang,Zongyu Huang,Jianxin Zhong
2D photocatalytic TiO2/MoS2 hybrid nanosheets (HNs) have been prepared via a facile hydrothermal process. X-ray diffraction patterns and Raman spectra are carried out and confirm a well crystalized anatase and 2H-MoS2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating the relatively stability of the MoS2 nanosheet platform with a high specific surface area. UV–vis spectra and electrochemical impedance spectra exhibit an enhanced light absorption ability and conductivity of TiO2/MoS2 compared to that of just TiO2. Photoelectrochemical (PEC) tests also demonstrate the photocurrent of 20 : 1 TiO2/MoS2 HNs is greatly improved compared to that of as-prepared TiO2. The saturation current density is about 33 µA cm−2 when the applied potential is 0.2 V, which is nearly twice that of pure TiO2 and four times as high as 5 : 1 TiO2/MoS2 HNs and 1 : 1 TiO2/MoS2 HNs. Besides that, the duration test exhibits no detectable distinction after processing 25 cycles. The improved photocatalytic activities are perhaps derived from the high conductivity and the increased active sites for the introduction of co-catalytic MoS2 nanosheets as well as the positive synergetic effect between the TiO2 and MoS2. This work demonstrates that the as-prepared TiO2/MoS2 HNs may have a great potential application in PEC hydrogen production.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 2
·027501
·
IF 3.721
Wei Zhang,Jimin Yang,Di Wu
An electrochemical biosensor for direct detection of PIK3CA gene related to lung cancer was developed based on riboflavin 5'-monophosphate sodium salt (FMNs)-functionalized MoS2 nanosheets prepared by simple ultrasonication method. As a highly effective biodispersant, FMNs demonstrated excellent stabilization for obtaining highly dispersed MoS2 nanosheets in an aqueous solution. The prepared FMNs/MoS2 nanocomposite with fine electrochemical redox activity was employed as the platform to immobilize DNA probe and supplied the inherent indicator signal for DNA sensing. The amine-terminated ssDNA probe was covalently immobilized onto the FMNs/MoS2 nanocomposite with rich phosphonate groups. After the hybridization of the probe ssDNA with the complementary target DNA, the self-redox signal of the nanocomposite decreased ascribed to the changes in the conformation of DNA. The results indicated that the proposed self-signal detection platform displayed high sensitivity with a detection limit of 1.2 × 10–17 mol l−1 for PIK3CA gene from lung cancer, accompanied with fine selectivity, outstanding stability and reproducibility. The constructed biosensor was easy to design and had the potential for the detection of different pathogenic DNA without intricate label process.
研究领域:
生物医学工程
·
分子生物学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
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
WATER RESEARCH
·
2023
·
IF 12.8
Yun-Jie Wang,Chen-Xuan Li,Yan Meng,Zhi-Yan Guo,Shuo Cui,Xian-Zhong Fu,Hou-Qi Liu,Wen-Qi Xia,Wen-Wei Li
Low-pressure catalytic membranes allow efficient rejection of particulates and simultaneously removing organics pollutant in water, but the accumulation of dissolved organic matters (DOM) on membrane surface, which cover the catalytic sites and cause membrane fouling, challenges their stable operation in practical wastewater treatment. Here we propose a ferric salt-based coagulation/co-catalytic membrane integrated system that can effectively mitigate the detrimental effects of DOM. Ferric salt (Fe 3+ ) was in the wastewater, serving both as DOM coagulant to lower the membrane fouling and as a co-catalyst with the membrane-embedded MoS 2 nanosheets for perxymonosulfate (PMS) activation and pollutant degradation. The membrane functionalized with 2H-phased MoS 2 nanosheets showed improved hydrophilicity and fouling resistance relative to the blank polysulfone membrane. Attributed to the DOM coagulation and co-catalytic generation of surface-bound radicals for decontamination at membrane surface, the catalytic membrane/PMS/ Fe 3+ system showed much less membrane fouling and 2.6 times higher pollutant degradation rate in wastewater treatment than the catalytic membrane alone. Our work imply a great potential of coagulation/co-catalytic membrane integrated system for water purification application.
研究领域:
环境科学
·
材料科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FERROELECTRICS
·
2021
·
IF 0.62
Feng Wang,Fang-Yuan Lv,Kui-Long Liu,Zhi-Hao Li,Shu Niu,Yun-Yi Zhang,Hai-Lin Cong,You-Qing Shen,Bing Yu
A MoS2 nanosheets drug delivery system with photothermal conversion ability was synthesized. The drug loading content of the synthesized was as high as 24.5%. The drug HCPT was modified by lipoic acid (LA) and connected onto MoS2 nanosheets through S-Mo bond, which is more stable than physical adsorption. Due to the ester bond between HCPT and MoS2 nanosheets, the drug delivery system could responsively release HCPT when exposed to esterase.
研究领域:
材料科学与工程
·
生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 31
·期 3
·422-427
·
IF 2.851
Xue Lou,Li-quan Zhang,Qing-hui Liu,Ying-hui Wang,Lian-Fei Yao,Yan-ting Wang,Zhi-hui Kang,Qiang Zhou,Han-Zhuang Zhang
The performance of nano-sensor based on MoS 2 nanosheet mixed with Au particle is tested based electrochemical test involving cyclic voltammogram and impedance spectroscopy, where the Fe III (CN) 6 3− /Fe II (CN) 6 4− and dopamine (DA) are chosen as research object to verify the role of layer number of MoS 2 nanosheet and the temperature. The electrochemical test shows the Au nanoparticle would improve the electron exchange reaction occurring on the electrode. In the solution of Fe III (CN) 6 3− /Fe II (CN) 6 4− , the electrode reaction follows , where increasing the layer number of MoS 2 nanosheet would restrict the reaction. In the DA system, the reaction of occurs on the electrode and increasing the layer number of MoS 2 nanosheet would facilitate the reaction. The difference as mentioned above is assigned to the energy level shift originated from variance of layer number of MoS 2 nanosheet and the changing of reaction mechanism. In addition, temperature would mainly facilitate the kinetics of electron exchange reaction, which is assigned to the diffusion acceleration of DA molecule. Simultaneously, the desorption process of reactant in the electrolyte would enhance. The role of layer number of MoS 2 nanosheet and the temperature is clarified with the thermodynamic and kinetic properties of electron exchange reaction based on MoS 2 nanosheet, which would improve the understanding of nano-sensor based on MoS 2 nanosheet.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·125312
·
IF 1.449
Maoyong Zhi,Quanyi Liu,Shansong Gao,Yinlong Zhao,Xinhua Zhu,Xuhong Jia
A novel three bilayers nanocoating containing MoS2 nanosheets and C60 was constructed on the surface of flexible polyurethane (FPU) foam by a layer-by-layer assembly method. MoS2 nanosheets were prepared by ultrasonic-assistant exfoliation method in a mixed solvent of N-Methyl-2-pyrrolidinone (NMP) and aqueous hydrogen peroxide (30% H2O2). MoS2-C60/FPU foam was prepared by alternately submerging the FPU foam into C60/guargum and MoS2/sodium alginate suspensions. Scanning electron microscopy (SEM) characterization showed that MoS2 nanosheets and C60 nanoparticles were uniformly distributed on the surface of FPU foam matrix. Thermogravimetric analysis demonstrated that MoS2-C60/FPU foam exhibited better thermal stability than the control FPU foam. Cone calorimeter test results revealed that MoS2-C60/FPU foam with the incorporation of 5.24 wt% MoS2-C60 nanocoating had a remarkable reduction in peak heat release rate (pHRR, 47.5% reduction), total heat released (THR, 51.1% reduction) and total smoke production (TSP, 33.1% reduction) compared with those of the control FPU foam. Furthermore, the morphology and structure of char residue after cone calorimeter test were investigated by SEM and Raman spectroscopy. The possible flame-retardant mechanism of MoS2-C60/FPU foam was proposed, and this significant improvement in flame retardancy could be ascribed to the insulating barrier and adsorption effect of MoS2 nanosheets, free radicals-trapping ability of C60 in condensed phase, and the catalytic carbonization effect of the MoS2-C60 nanocoating. This work provides a new approach for producing high quality flame retardant polyurethane foam materials.
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 Environmental Chemical Engineering
·
2022
·
IF 7.968
Hongshan Wang,Zhenzhen He,Qiangbin Yang,Guangyong Zeng,Zhaomei Yang,Shengyan Pu
MXene nanosheets were functionalized by introducing sodium lignosulfonate (LS) containing abundant hydrophilic groups (sulfonic acid groups and phenolic hydroxyl groups), along with the intercalation of MoS 2 nanosheets between the functionalized MXene layers. A pressure-assisted self-assembly was utilized for the fabrication of a two-dimensional (2D) MXene membrane with high water permeation and excellent dye separation characteristics. The MoS 2 @LS-MXene composite membrane has excellent pure water flux (188.1 L·m -2 ·h -1 ), which is 85% higher than that of the unfunctionalized MXene membrane, and has a good rejection effect on dye molecules (93% for Congo red (CR), and 99% for Rhodamine B (RhB)). The appropriate interlayer spacing and negative surface charge resulted low rejection of salts (4.2% of NaCl, 4.6% of Na 2 SO 4 ) in dye-salt hybrid system, consequently leading to their mutual separation. The composite membrane also exhibits excellent stability and anti-fouling ability. This study provides a simple and novel design idea for the preparation of high-performance 2D MXene membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Kunkun Wang,Qi Han,Beizhao Chen,Bei Liu,Zhongying Wang
Lead (Pb 2+ ) is one of the most common and harmful heavy metal contaminants that cause water pollution worldwide. Two-dimensional MoS 2 nanomaterials have been reported to possess high capability for the removal of Pb 2+ , whereas the long-term application is limited by the tendency of oxidative decomposition. In this study, we electrochemically exfoliated MoS 2 (E-MoS 2 ) to investigate the adsorption performance and chemical stability as compared with other commonly-studied MoS 2 nanomaterials. The results revealed that E-MoS 2 displayed a Pb 2+ removal capacity of 357.2 mg/g, much higher than that of hydrothermally synthesized MoS 2 although they both are pure 2H phase. More importantly, the E-MoS 2 nanosheets exhibited super stable performance, with the Pb 2+ adsorption barely interfered after 15 days of aging in air, while the 1T-dominated MoS 2 samples decreased by up to 50 %. The unchanged performance of E-MoS 2 derived from the properties of oxidation resistance , whereas other MoS 2 nanomaterials could be oxidized to soluble Mo(VI). Investigations for the mechanisms by XPS, XRD and TEM characterizations suggested that the removal of Pb 2+ was achieved by binding on the surface of E-MoS 2 , without any contribution of PbMoO 4 precipitates like that in other MoS 2 nanomaterials. Relatively high adsorption capacity and excellent chemical stability render E-MoS 2 practical significance for the long-term application in water treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）