RARE METALS
·
2023
·Vol. 42
·期 9
·3034-3045
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IF 8.8
Ning Xue-Er,Jia Dian-Zeng,Li Shan-Hao,Khan Muhammad Farooq,Hao Ai-Ze
A highly efficient piezocatalyst of oxygen-incorporated MoS 2 (O-MoS 2 ) was designed and successfully synthesized via facile modulation of hydrothermal process temperature method. Remarkably, a superior piezocatalytic H 2 evolution rate of 46.1 μmol·g −1 ·h −1 in pure water and 921.0 μmol·g −1 ·h −1 in methanol solution is obtained on optimal O-MoS 2 -180 (with a hydrothermal process temperature of 180 °C), outperforming pristine MoS 2 and most of the reported other catalysts. Moreover, piezocatalytic activity of O-MoS 2 toward the degradation of organic pollutants depends on hydrothermal temperatures. The suitable temperature of O-MoS 2 -180 presents dramatically excellent piezocatalytic capacity compared with the pristine MoS 2 for degradation of methylene blue (MB) dye. The reaction rate constant of O-MoS 2 -180 reaches to 54.6 × 10 −3 min −1 , which is nearly 18 and 4-folds in contrast with pristine MoS 2 and O-MoS 2 -140 (with a hydrothermal process temperature of 140 °C), respectively. Simultaneously, it also manifests that O-MoS 2 -180 endows relatively high degradation efficiency (84.6% within 30 min) and excellent stability. Moreover, it is also demonstrated that optimal O-MoS 2 can dramatically promote charge carriers transport and separation. Furthermore, our theoretical calculation results suggest that the oxygen-incorporated can modulate the surface electronic state, enhance active sites as well as optimize the hydrogen adsorption Gibbs free energy of MoS 2 , thus extremely boosting piezocatalytic efficiency. Ultimately, an innovative piezocatalytic mechanism is proposed to reveal and expound the relationship between piezocatalytic property and oxygen-incorporated role. Graphical abstract
研究领域:
材料科学
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环境科学
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物理化学
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纳米催化
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能源材料
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表面科学
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 47
·期 9
·5509-5517
·
IF 1.566
Wang Wenzhao,Chen Xiaoxiao,Zeng Xiangbin,Wu Shaoxiong,Zeng Yang,Hu Yishuo,Xu Sue,Zhou Guangtong,Cui Hongxing
Recently, great efforts have been devoted to study of molybdenum disulfide (MoS 2 ), particularly monolayer MoS 2 semiconductor thin films, due to its excellent electrical and optical properties. Direct growth of continuous monolayer MoS 2 films by ambient-pressure chemical vapor deposition is reported herein. Optical microscopy, Raman spectroscopy, photoluminescence spectra (PL), atomic force microscopy, x-ray photoelectron spectroscopy (XPS), and high-resolution transmission electronic microscopy were used to characterize the electronic and structural properties of the films, demonstrating that the MoS 2 films grown on silicon dioxide/silicon (SiO 2 /Si) substrate with spatial size on micron scale were high quality, single crystal, continuous, and monolayer. Raman and PL mapping were performed to confirm the uniformity of the monolayer MoS 2 films. The morphological variation of the MoS 2 films after different reaction times was observed by optical microscopy and scanning electron microscopy, revealing the growth process and thus helping to understand that the growth mechanism during synthesis of continuous large-area films depends on the distribution of the reactive intermediate molybdenum oxide (MoO 3− x ) due to its lower saturation vapor density. Back-gated transistors based on MoS 2 films were fabricated, exhibiting current on/off ratio of ∼ 10 4 and subthreshold swing (SS) of 0.44 V dec −1 . This work contributes to synthesis of large-area continuous films, thus paving the way for future scaled-up fabrication of MoS 2 electronic devices.
研究领域:
材料科学
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纳米技术
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表面科学
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半导体物理
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薄膜生长
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Zhong Dong,Xu Wu,Mengying Chen,Hanxiao Chen,Ke-Jing Huang,Lingling Wang,Jing Xu
Pure phase MoS 2 has low conductivity, but with high theoretical specific capacity, and WS 2 possesses a high intrinsic conductivity, but suffer from rapid capacity fading. Predictably, the combination of these two transition metal sulfide compounds can complement each other and improve electrochemical performance comprehensively. Whereas, bimetallic phase sulfide of MoS 2 and WS 2 composites have not been researched in SIBs . In this paper, 1T metallic phase MoS 2 and WS 2 vertically growth on flexible carbon cloth (CC) surface (1T-MoS 2 @WS 2 @CC) by a simple hydrothermal method. The electrochemical performance was improved by heterojunction synergistic effect and the enhanced interlayers of the composite material. Specifically, the superelevation reversible capacity of 529.4 mAh/g can be obtained even after 100 cycles at the current density of 100 mA g −1 , and the 259.2 mAh/g capacity can be maintained even at high current density of 1000 mA g −1 after 60 cycles. Besides, the designed 1T-MoS 2 @WS 2 @CC composite material has excellent rate performance and cycle stability which are guarantee for battery core performance. Thus, there is every reason to believe that the advanced 1T-MoS 2 @WS 2 @CC electrode material has great potential in the future high performance energy storage devices.
研究领域:
材料科学
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储能
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电化学
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纳米材料
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
·
IF 9.5
Jinyuan Zhu,Wenqiao Meng,Qiang Xue,Kaisong Zhang
Nano-fillers will be an attractive strategy to improve salt fractionation of nanofiltration (NF) membrane if the integrity problem of nano-fillers in PA layer is well addressed. In this work, molybdenum disulfide (MoS 2 ) nanosheets sulfonated with 1,3-propane sultone was added to the aqueous phase to participate in the interfacial polymerization reaction and construct a novel thin-film nanocomposite (TFN) nanofiltration membrane . A series of characterization and discussion were carried out on the obtained nanomaterials and membranes. The S–MoS 2 nanosheet can be well wrapped by the resulted PA layer, thereby preserving the integrity of the PA skin. Furthermore, The TFN membranes possessed enhanced electronegativity and hydrophilicity and the PA layer became thinner and denser after introducing the sulfonated MoS 2 nanosheets (S–MoS 2 ) in the PA matrix. In particular, the optimal S–MoS 2 composite membrane exhibits excellent performance, which approximately reach 99% divalent salt (Na 2 SO 4 ) rejection and 1.4-fold water permeance of the pristine membrane. Overall, this study provided a novel way for separation treatment of hypersaline wastewater.
研究领域:
材料科学
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环境工程
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纳米技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Junyu Lei,Ziqiao Jiang,Xiaofeng Lu,Guangdi Nie,Ce Wang
We report a facile strategy to synthesize a hierarchical core-sheath PANi@MoS 2 nanocomposite as an advanced electrode material for high-performance electrochemical capacitor applications. Hierarchical core-sheath PANi@MoS 2 nanostructure is prepared in a one-pot synthesis via a hydrothermal redox reaction between ammonium tetrathiomolybdate and polyaniline nanofibers. Structural and morphological characterizations of the as-prepared PANi@MoS 2 nanocomposite are investigated by Fourier-transform infrared (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) measurements. The obtained PANi@MoS 2 electrode displays a good electrochemical capacitance performance with a specific capacitance of 450 F g −1 under 0.5 M H 2 SO 4 . More importantly, the core-sheath structure of PANi@MoS 2 electrode enhances the structural stability during the electrochemical process and thus improves the electrochemical cycling stability of the electrode significantly, which retains 80% in specific capacitance after 2000 charge/discharge processes.
研究领域:
材料科学
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电化学
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纳米技术
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储能
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DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yansong Ma,Biao Ma,Di Wu,Jun Wang,Yang Li,Xiaobin Fan,Qing Xia,Fengbao Zhang,Wenchao Peng
Perovskite materials are reported to be effective in peroxymonosulfate (PMS) based Fenton-like reactions, the leaching rates of chalcogenide materials in perovskite materials are however serious, thus leading to bad performance in long-term stability. In this study, an O-doped MoS 2 is synthesized to composite with LaCoO 3 , and the high catalytic activity of LaCoO 3 is well preserved with greatly decreased Co leaching. During the BPA degradation with PMS as oxidant, ∼100% degradation can be achieved in 20 min and this degradation efficiency can be maintained for ∼45 h in a simulated fixed bed reactor, which is almost 3 times longer than the pure LaCoO 3 . With the compositing of O-doped MoS 2 , the leached Co was greatly decreased and the dominated reactive oxidation species (ROS) transformed from SO 4 •– into O 2 •– with longer lifespan, thus resulting in the better stability. This study could promote the application of perovskite materials in the real industrial wastewater treatment .
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jinchao Chen,Zhi Chen,Wan Zhao,Yurong Liu,Jianhao Wu,Weiwei Wang,Xiangyu Chen,Jingyang Gao,Jinglei Hu,Lili Xie,Qiyan Wei,Lan Li
Molybdenum disulfide (MoS 2 ) is a member of promising transition-metal dichalcogenides (TMDs); however, its practical application is restricted due to the heavy aggregation. 1T/2H-MoS 2 decorated with SiO 2 nanospheres was successfully prepared through a facile hydrothermal process demonstrating improved behavior for the visible-light-driven treatment of aquatic antibiotic residues. The prepared samples were characterized by XRD, Raman spectra, SEM, TEM, XPS, and KPFM systematically. The improved properties are related to the increased light absorption, decreased accumulation of 1T/2H-MoS 2 , and the reduced recombination of electron-hole pair due to the introduction of SiO 2 . Moreover, the scavenger studies confirm that superoxide radicals (⋅O 2 − ), hydroxyl radicals (⋅OH), and holes (h + ) play a vital role in the photocatalytic degradation of TC-HCl, and a possible mechanism for photocatalysis is discussed. This work provides a promising strategy to modify the photocatalytic performance by simply dispersing the photocatalyst with another component such as SiO 2 .
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junli Liu,Wenxia Cheng,Kaitao Zhang,Hui Liu
Bacterial infections is a serious threat to our health. Thus, there is an urgent need to develop a new effective antibacterial agent. In this work, we developed a novel and environmentally friendly Ce–MoS 2 /WO 3 nanocomposite antimicrobial agent with excellent antimicrobial effect and the antimicrobial efficiency against E. coli reached to 97.8% under visible light irradiation. Electron paramagnetic resonance (EPR) spectra showed that the large amounts of superoxide anion radical (•O 2 − ) and hydroxyl radical (•OH) were generated by the nanocomposites under light excitation, which were the main active substances causing oxidative damage for bacteria. Simultaneously, the photothermal curve and peroxidase activity test of Ce–MoS 2 /WO 3 nanocomposites confirmed it has the excellent photothermal effect and enhanced enzyme-like activity, which further assisted in antibacterial effects. Ce doping enlarges the layer spacing of MoS 2 and forms lattice dislocations and distortions, effectively increasing the defect sites at the layer edges, and the coupling of Ce–MoS 2 and WO 3 to construct heterojunctions reduces the charge separation rate, which further improves the photocatalytic antibacterial performance and enzyme-like antibacterial activity of Ce–MoS 2 /WO 3 nanocomposites.
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Nanomaterials
·
2023
·Vol. 13
·期 4
·752
·
IF 5.3
Xiaoyan Bai,Tianqi Cao,Tianyu Xia,Chenxiao Wu,Menglin Feng,Xinru Li,Ziqing Mei,Han Gao,Dongyu Huo,Xiaoyan Ren,Shunfang Li,Haizhong Guo,Rongming Wang
Constructing a heterogeneous interface using different components is one of the effective measures to achieve the bifunctionality of nanocatalysts, while synergistic interactions between multiple interfaces can further optimize the performance of single-interface nanocatalysts. The non-precious metal nanocatalysts MoS2/NiSe2/reduced graphene oxide (rGO) bilayer sandwich-like nanostructure with multiple well-defined interfaces is prepared by a simple hydrothermal method. MoS2and rGO are layered nanostructures with clear boundaries, and the NiSe2nanoparticles with uniform size are sandwiched between both layered nanostructures. This multiple-interfaced sandwich-like nanostructure is prominent in catalytic water splitting with low overpotential for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) and almost no degradation in performance after a 20 h long-term reaction. In order to simulate the actual overall water splitting process, the prepared nanostructures are assembled into MoS2/NiSe2/rGO||MoS2/NiSe2/rGO modified two-electrode system, whose overpotential is only 1.52 mV, even exceeded that of noble metal nanocatalyst (Pt/C||RuO2~1.63 mV). This work provides a feasible idea for constructing multi-interface bifunctional electrocatalysts using nanoparticle-doped bilayer-like nanostructures.Keywords:nanoparticle-doped bilayer-like nanostructures;multiple interfaces;overall water splitting;dual function;non-precious metal catalysis
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 14
·40534-40550
·
IF 5.8
Fang Lei,Wu Guojian,Yao Keyu,Zhang Dongyang,Zhou Yongchao
A novel heterogeneous catalyst named MoS 2 /MIL-53(Fe, Cu) (MMFC) was prepared by hydrothermal method and applied in a heterogeneous electro-Fenton (hetero-EF) system for lomefloxacin (LOM) degradation in this work. Under the optimal conditions of current density 3 mA/cm 2 , catalyst dosage 0.100 g/L, and initial pH 6, 93.5% LOM (2 mg/L) removal efficiency was achieved in the MMFC hetero-EF system within 60 min, indicating an obvious improvement compared with the MIL-53(Fe, Cu) hetero-EF system. The good catalytic activity was attributed to more effective active sites of the catalyst and the conversion of Fe(II)/Fe(III) and Cu(I)/Cu(II) promoted by Mo(IV) in MoS 2 , which could be inferred by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) characterizations. The reusability and stability of MMFC were explored based on five cyclic experiments, and the average degradation efficiency reached 73.9%. Furthermore, the hetero-EF system could achieve the total removal of moxifloxacin and tetracycline within 6 min and 40 min, respectively. Quenching experiments revealed that the hydroxyl radicals (·OH) were the main reactive radicals while superoxide radicals (·O 2 − ) and singlet oxygen ( 1 O 2 ) played a certain part in LOM degradation. Finally, the possible mechanism of the hetero-EF process and LOM degradation pathways were proposed, including substitution, elimination, and cleavage of ring structures. Accounting for good catalytic performance, low preparation cost, and satisfactory versatility, the MMFC exhibited good potential to work as a hetero-EF catalyst for wastewater treatment.
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PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Di Zhang,Zhijun An,Yiwen Zhang,Yufeng Hu,Jingjing Zhan,Hao Zhou,Minghuo Wu
A continuous flow mode fixed-bed reactor (FBR) was built for the efficient degradation of triazine herbicides (THs) in wastewater, in which MoS 2 @SiO 2 composites were used as a co-catalyst for the Fe 2+ activated persulfate (PS) oxidation . The degradation activity of this MoS 2 @SiO 2 /PS/Fe 2+ FBR was evaluated by choosing atrazine (ATZ) as a model pollutant, and operation conditions were systematically optimized, including the amount of oxidant, Fe 2+ concentration, initial pH, flow rate, and coexisting interferences. The degradation results showed that MoS 2 @SiO 2 could greatly improve the degradation efficiency, and over 97.1 % of ATZ could be degraded under the optimized conditions (hydraulic residence time of 24 s). In this reaction system, sulfate radicals and hydroxyl radicals played the major roles (over 80 %) in the degradation process. Continuous treatment of 1400 mL wastewater could be achieved with 1.0 g MoS 2 @SiO 2 composite with a degradation efficiency maintained above 80 %. Four tested THs of ATZ, simazine , ametryn and prometryn could be efficiently degraded. Furthermore, the removal rate of ATZ in pond water reached 77.6 % and the mineralization rate was about 51 %, indicating this MoS 2 @SiO 2 /PS/Fe 2+ FBR was applicable in the treatment of real wastewater .
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yuge Wang,Huiyu Duan,Hao Li,Jianzheng Zhen,Weiyang Lv
The application of MoS 2 as an emerging cocatalyst in wastewater treatment is of great significance, but the efficiency of cocatalyst is often limited due to its easy agglomeration and insufficient interaction with the catalyst. Here, we used layered double hydroxide (LDH) as the catalyst and the growth template of MoS 2 to achieve an efficient combination of catalyst and cocatalyst in the removal of organic pollutants by peroxymonosulfate (PMS) activation. The outcomes showed that the MoS 2 intercalated LDH composite samples (MLDH) owned excellent phenol degradation performance, reaching nearly 100% removal within 10 min, and the calculated apparent rate constants were 2.3, 5.6, 17.7 and 19.8 times higher than that of the samples of directly growing MoS 2 on the LDH (M@LDH), physically blended MoS 2 and LDH samples, LDH and MoS 2 , respectively. Based on the results of electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), SO 4 •- had a major impact on the elimination of phenol, Mo(Ⅳ) in MoS 2 also participated in and encouraged the Fe(Ⅲ)/Fe(Ⅱ) redox cycle, providing the driving force for the further activation of PMS . Moreover, the effects of pH value, anions, cations and water environment of MLDH during the activation of PMS were also determined, and it was found that under various catalytic environments, MLDH always maintained a high removal rate of phenol and showed strong anti-interference ability. Collectively, the results of this research would offer more possibilities and suggestions for creating highly effective catalysts for wastewater cleanup.
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