Journal of Water Process Engineering
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2023
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IF 7
Wenhui Zhu,Ali Reza Kamali
Wet-mechanochemical exfoliation of molybdenum disulfide (MoS 2 ) flakes into MoS 2 quantum dots (QDs) using various exfoliation agents is studied, and the photoluminescence , adsorption and photocatalytic activities of QDs toward the degradation of rhodamine B (RhB) are evaluated. The application of ethanol as the low-boiling point (≈78 °C) exfoliation agent leads to the formation of E-MoS 2 QDs (4.6 nm) with 1T-crystalline modification, dominately functionalized with hydroxyl groups. Initial MoS 2 provides a weak adsorption capacity (27 mg/g), while no photocatalytic activity is observed under LED-light irradiation. E-MoS 2 QDs exhibit a poor photocatalytic performance, but an excellent RhB adsorption with an equilibrium capacity of 180 mg/g under dark condition. In contrast, the application of N-Methyl-2-pyrrolidone (NMP) as the high-boiling point (≈202 °C) exfoliation agent leads to the fabrication of N-MoS 2 QDs (4.8 nm) with stable 2H-crystalline modification. N-MoS 2 QDs exhibits a limited adsorption capacity (32 mg/g), but an excellent stability and photocatalytic performance. At the photocatalyst dosage of 0.1 g/L, the degradation rate of dye (20 mg/L) is recorded at 100 % after 140 min of LED-light (450 nm) illumination. Reusability of N-MoS 2 QDs in photocatalysis process is confirmed. Appropriate energy band gap, together with the surface amino/carboxyl functional groups are discussed to be responsible for enhanced light-induced intramolecular electron transfer , thus photocatalytic performance of the material.
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DESALINATION
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2022
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IF 11.211
Junxia Liu,Pei Cao,Xuri Yu,Tian Li,Wen Sun,Yaxiang Zhao,Hongjian Yu,Zhihong Wang,Jialuo Zeng,Bingzhi Dong,Haiyan Yang,Shuili Yu
Biofouling is a bottleneck in restricting nanofiltration (NF) application for drinking water treatment . In current study, we reported a novel molybdenum disulfide (MoS 2 ) ‑ copper (Cu 2+ ) modification of polyamide NF membrane for enhanced anti-bacterial performance. The incorporation of Cu 2+ into the separation layer through interfacial polymerization was to enhance the anti-microbial ability, while the introduction of lamellar MoS 2 into the polyamide active layer was to stably immobilize copper, as well as to provide an interlayer nanochannels for water transport and also to enhance membrane hydrophilicity . The resultant membrane showed an excellent anti-bacterial ability, with 99.1% and 96.7% inactivation efficiencies of Escherichia coli and Bacillus subtilis , respectively, at MoS 2 - Cu molar ratio of 1:0.3. Compared to the control membrane, the obtained membrane exhibited a 44% increase of pure water flux . Membrane stability assessment indicated that > 93% of initial loaded Cu 2+ and Mo 4+ remained in the membrane matrix after a 5-d shaking test. Membrane characterization suggested that the MoS 2 - Cu complexes were uniformly dispersed into the membrane active layer, which led to an increased membrane roughness that was favorable for antibiofouling. Overall, the facile MoS 2 – Cu addition with intensified anti-biofouling ability created in this study provides a promising membrane modification approach for practical application.
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ACS Biomaterials Science & Engineering
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2022
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IF 5.395
Chunya Song,Qiqi Sun,Limei Qin,Meiwan Chen,Yongsheng Li,Dechao Niu
Recently, molybdenum sulfide (MoS2) has shown great application potential in tumor treatment because of its good photothermal properties. Unfortunately, most of the current molybdenum disulfide-based nanotherapeutic agents suffer from complex preparation processes, low photothermal conversion efficiencies, and poor structural/compositional regulation. To address these issues, in this paper, a facile “confined solvothermal” method is proposed to construct an MoS2-loaded porous silica nanosystem (designated as MoS2@P–hSiO2). The maximum photothermal efficiency of 79.5% of molybdenum-based materials reported in the literature at present was obtained due to the ultrasmall MoS2 nanoclusters and the rich porous channels. Furthermore, both in vitro and in vivo experiments showed that the cascade hybrid system (MoS2/GOD@P–hSiO2) after efficient loading of glucose oxidase (GOD) displayed a significant tumor-suppressive effect and good biosafety through the combined effects of photothermal and enzyme-mediated cascade catalytic therapy. Consequently, this hybrid porous network system combining the in situ solvothermal strategy of inorganic functional components and the efficient encapsulation of organic enzyme macromolecules can provide a new pathway to construct synergistic agents for the efficient and safe treatment of tumors.
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高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2021
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IF 4.346
Ming Qu,Tuo Liang,Jirui Hou,Zhichang Liu,Erlong Yang,Xingquan Liu
Recently, spherical nanoparticles have been studied to enhance oil recovery (EOR) worldwide owing to their remarkable properties. However, there is a lack of studies of nanosheets on EOR. Here, the amphiphilic molybdenum disulfide nanosheets were synthesized through a straightforward hydrothermal method. The octadecyl amine (ODA) molecules were grafted onto the surfaces of molybdenum disulfide nanosheets due to the presence of defects on the MoS 2 nanosheets surfaces. The synthesized amphiphilic molybdenum disulfide nanosheets (ODA-MoS 2 nanosheets) are approximate 67 nm in width. The effects of ultralow concentration ODA-MoS 2 nanosheets on the dynamic wettability change of solid surfaces and emulsion stability were also studied and discussed. Besides, the laboratory displacement experiments were also carried out to reveal the adsorption rules and the oil displacement effects by using ultralow concentration ODA-MoS 2 nanosheets. Experimental results indicate that the oil-wet solid surface (a contact angle of 130°) can transform into the neutral-wet solid surface (a contact angle of 90°) within 120 h after 50 mg/L ODA-MoS 2 nanosheets treatment. In addition, micro-scale emulsions in size of 2 μm can be formed after the addition of ODA-MoS 2 nanosheets by adsorbing onto the oil-water interfaces. The desorption energy of a single ODA-MoS 2 nanosheet from the oil-water interface to the bulk phase is proposed. When the concentration of ODA-MoS 2 nanosheets is 50 mg/L, the emulsions are the most stable. Core flooding results demonstrate that the ultimate residue of ODA-MoS 2 nanosheets in porous media is less than 11%, and the highest increased oil recovery of around 16.26% (OOIP) is achieved. Finally, the production performance of ultralow concentration of ODA-MoS 2 nanofluid (50 mg/L) in the application of Daqing Oilfield is summarized and discussed.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Guoqing Xiao,Zhengwei Yang,Chunlin Chen,Chunyan Chen,Fei Zhong,Mingtan Wang,Rui Zou
An effective method to enhance the flame retardant capability of intumescent fire retardant (IFR) coatings by constructed a two-dimensional/two-dimensional (2D/2D) hybrid with good composition and microstructure. Herein, g-C 3 N 4 @PDA (CNP) was firstly obtained by loading graphite phase carbon nitride (g-C 3 N 4 ) with bio-inspired polydopamine (PDA). Subsequently, a novel CNP@Mo hybrids was successfully prepared by loading molybdenum disulfide onto the CNP surface via a simple one-step hydrothermal method . Then, the obtained CNP@Mo was added to the IFR coating as a synergist to improve the flame resistance. Results indicated that the addition of 2 wt% CNP@Mo to the coating effectively accelerated the formation of the char layer and reinforced its thermal insulation properties. The CNP@Mo/EP sample exhibited the lowest backside temperature (179.6 ℃), the highest expansion ratio (10.53) and the most residual char (30.7%) by fire performance test, furnace test and TGA test. The combustion performance of the IFR coatings was investigated by cone calorimeter , and the results showed that the CNP@Mo hybrids based composite coating exhibited the lowest heat release rate (HRR), total heat release rate (THR), and total smoke production value (TSP). The mechanism investigations showed that the physical barrier effect and catalytic carbonization produced by CNP@Mo hybrids during the combustion process are the main reasons for the improved flame retardancy of epoxy coatings.
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ACS Nano
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2021
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IF 15.881
Xueting Zhai,Renxiang Zhang,Huixiang Sheng,Jin Wang,Yameng Zhu,Zichen Lu,Zhuoyao Li,Xiao Huang,Hai Li,Gang Lu
Single and a few atomic-layer molybdenum disulfide (MoS2) is a promising material in the fields of hydrogen generation, battery, supercapacitor, and environmental protection, owing to the outstanding electronic, optical, and catalytic properties. Although many approaches have been developed for exfoliation of MoS2 sheets, it is still essential to develop simple, convenient, and environmental friendly exfoliation methods. More importantly, the microscopic exfoliation process and the mechanism are still not clear, limiting a deeper understanding of the exfoliation. Herein, we develop a convenient and clean method for exfoliation of the 2H phase MoS2 (2H-MoS2) deposited on an indium tin oxide (ITO) surface. Importantly, the exfoliation process is observed directly and continuously under an optical microscope to reveal the detailed exfoliation process and mechanism. As illustrated, the light illumination triggers the exfoliation of the 2H-MoS2 sheets, and the presence of water is essential in this exfoliation process. The light intensity and wavelength, humidity, and bias all affect the exfoliation process obviously. The exfoliation is caused by the vaporization of the water molecules intercalated in 2H-MoS2 interlayers. By using this method, 2H-MoS2 nanosheets with different thicknesses are prepared on the ITO substrate, and microscopic catalysis mapping of the exfoliated sheets is demonstrated with single-molecule fluorescence microscopy, revealing that the prepared thin-layer 2H-MoS2 nanosheets show improved electrocatalysis activity (roughly 20 times). Our work will not only help deepen the understanding of exfoliation process of two-dimensional nanosheets but also provide an effective tool for the in situ study of various properties of the exfoliated sheets.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Huiyong Wang,Shuangyu Li,Qiang Wan,Xin Su,Tao Song,Xiaobing Wang,Jianji Wang
Two-dimensional (2D) molybdenum disulfide (MoS 2 ) has drawn increasing attention due to its great potential for advanced electronics, photonics , optoelectronics , energy storage, catalysis and solar cell. However, high effective exfoliation for the mass production of 2D MoS 2 is still a challenge. To improve the exfoliation efficiency of MoS 2 nanosheets , a facile liquid-phase exfoliation strategy has been developed by using organic electrolyte solutions in this work. It is shown that the dispersion concentration of MoS 2 nanosheets has been significantly enhanced in organic electrolyte solutions. For example, by adding sodium tartrate into dimethyl sulphoxide , the dispersion concentration of MoS 2 nanosheets is 85 times that in neat dimethyl sulphoxide. About 80% of MoS 2 nanosheets obtained in such a strategy is 1–4 layers and the nanosheets remain 2H phase structure. In addition, the photocatalytic hydrogen evolution performance of the as-prepared few-layer MoS 2 nanosheets is evaluated. The photocatalytic hydrogen evolution rate is as high as 0.5 mmolg −1 h −1 , which is 71 and 10 times higher than that of bulk MoS 2 and the 2H-MoS 2 nanosheets, respectively, reported to date. Exfoliation mechanism investigation suggests that the size of cation and the intensity of Lewis basicity of anion in the salts have played an important role in the exfoliation of MoS 2 . The liquid exfoliation strategy reported here has great potential in the large-scale and high quality production of few-layer MoS 2 nanosheets for efficient photocatalytic hydrogen evolution.
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CHEMOSPHERE
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2021
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IF 7.086
Yu Li,Yong Feng,Bin Yang,Zequn Yang,Kaimin Shih
The activation of persulfate by ferrous iron (Fe(II)) is of great interest to the environmental remediation community, but the reduction of ferric iron (Fe(III)) to Fe(II) is slow and the accumulation of iron sludge resulted from the precipitation of Fe(III) is a great concern. Here, molybdenum disulfide (MoS 2 ) was studied as a co-catalyst to improve the activation of peroxymonosulfate (PMS) by Fe(III) for sulfadiazine (SDZ) degradation and different characterization technologies were used to reveal the reactive species. The results showed that a strong synergy existed between MoS 2 and Fe(III); approximately 94.3% of the SDZ was removed by MoS 2 -Fe(III)-PMS after reaction for 30 min, while only 8.5% and 56.4% of the SDZ was removed by Fe(III)-PMS and MoS 2 -PMS, respectively. Both hydroxyl radicals and sulfate radicals were generated and the latter was the primary species. In addition to the radicals, singlet oxygen was found to be generated and contributed to the degradation of SDZ. The chemical probe reaction with methyl phenyl sulfoxide showed that the generation of high-valent iron-oxo species was not obvious by MoS 2 -Fe(III)-PMS under both acidic and neutral conditions. MoS 2 had good stability. No noticeable deactivation was observed during the 1st to 5th run and no obvious oxidation of surface Mo(IV) occurred. Based on the characterization of catalyst and oxidizing species, a mechanism for the activation of PMS by MoS 2 -Fe(III) was proposed. The results from this study are expected to clarify the reactive species and deepen the understanding of MoS 2 -promoted persulfate activation by Fe(II)/Fe(III).
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yunfei Zhang,Junfeng Niu,Jianhui Xu
In this study, it was demonstrated that the Fe ion was an effective promoter of bulk MoS 2 for the activation of peroxymonosulfate (PMS) to degrade acetaminophen (ACT). ACT removal rate constant in the presence of 5 mg/L FeSO 4 ·7H 2 O (0.1099 min −1 ) was approximately 20 times as that in the absence (0.0045 min −1 ) with 0.1 g/L MoS 2 of FeSO 4 ·7H 2 O at pH 0 3. Both electron paramagnetic resonance (EPR) characterization and quenching experiment suggested the key role of singlet oxygen ( 1 O 2 ), acting as dominant reactive species responsible for ACT degradation in the Fe 2+ /MoS 2 /PMS system. Besides, the chemical state and composition of MoS 2 , the ion (Fe and Mo) concentrations and the speciation of Mo(VI) were investigated. Results suggested that the promoting effect of Fe(II) ion originated from the regeneration of Fe 2+ mediated by MoS 2 , and the formation of molybdenum(VI) peroxo complex species in Fe 2+ /MoS 2 /PMS system. The present study not only provides an insight into PMS activation by MoS 2 accelerated by Fe(II) ion, but also suggests an high-efficiency, easy-to-handle and environmentally friendly method to treat refractory wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Xiaoyong Qian,Guanjia Zhu,Kai Wang,Fangzhou Zhang,Kai Liang,Wei Luo,Jianping Yang
MoS 2 nanosheets are widely investigated for energy storage and catalytic application, however, the methodology for controllable growth of MoS 2 on functional matrix for boosting synergetic performance remains an urgent challenge. Herein, a nitrogen-containing polymer-induced interface growth strategy has been proposed for constructing a hierarchical bowl-like architecture, in which few-layer MoS 2 nanosheets anchored on bowl-like mesoporous carbon nanoparticles (BMCNs@MoS 2 ). The morphology, component and the thickness of MoS 2 nanosheets of BMCNs@MoS 2 can be effectively controlled by changing the growth conditions. Such a bowl-like mesoporous carbon can endow the architecture a unique unrestricted empty space, which can provide a freely entered channel for both lithium ions and electrons. Meanwhile, the less MoS 2 stacked layers, which can lead to large specific surface area contribute to enhancement of electrons transfer and exposure of active sites. As a result, when BMCNs@MoS 2 as an anode delivers a high specific capacity of 799 mA h g −1 at 0.2 A g −1 for 100 cycles, and an excellent rate capacity of 573 mA h g −1 at 2 A g −1 . The growth strategy developed in this work opens a new avenue to prepare a variety of transition-metal oxides or sulfides with ingenious morphology and enhanced performance.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2019
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IF 6.282
Sijia Zhao,Jiayao Yin,Keqing Zhou,Yi Cheng,Bin Yu
In this work, magnesium hydroxide (MH) nanoparticles were successfully grown on the surface of molybdenum disulfide (MoS 2 ) nanosheets through hydrothermal method , then the MH-MoS 2 hybrids were introduced into epoxy (EP) matrix. X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR) and Transmission electron microscopy (TEM) were performed to observe the structure and morphology of MH-MoS 2 hybrids. The MH nanoparticles were tightly attached to exfoliated MoS 2 nanosheets, and MH-MoS 2 hybrids had well dispersion state in EP matrix. The obtained EP composites displayed lower thermal decomposition rate and higher residual chars compared with those of pristine EP. With the addition of 2 wt% MH-MoS 2 hybrids, the peak heat release rate (pHRR) and fire growth rate index (FIGRA) of achieved composites had a substantial decrease at 32% and 39%, respectively, compared with those of pristine EP. Moreover, the peak smoke production rate (pSPR) and the amount of toxic CO yield were reduced by 27% and 38%, respectively. Raman spectra and scanning electron microscopy (SEM) results indicated a successive and compact char layer was formed due to the efficient catalytic charring effect of MH-MoS 2 hybrids.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Xueyi Zhang,Jianrong Wu,Gareth R. Williams,Yanbo Yang,Shiwei Niu,Qianqian Qian,Li-Min Zhu
Molybdenum disulfide (MoS 2 )-based drug delivery systems have shown considerable potential in cancer nanomedicines . In this work, a multifunctional nanoplatform comprising MoS 2 nanosheets decorated with copper sulfide (CuS) and further functionalized with polyethylene glycol (PEG) is reported. The resultant material has a particle size of approximately 115 nm, and can be loaded with doxorubicin (DOX) to a loading capacity of 162.3 mg DOX per g of carrier. Drug release is triggered by two stimuli (near infrared (NIR) irradiation and pH), and the carrier is shown to have excellent colloidal stability. The presence of both MoS 2 and CuS leads to very high photothermal conversion efficiency (higher than with MoS 2 alone). In vitro experiments revealed that the blank CuS-MoS 2 -SH-PEG carrier is biocompatible, but that the synergistic application of chemo-photothermal therapy (in the form of CuS-MoS 2 -SH-PEG loaded with DOX and NIR irradiation) led to greater cell death than either chemotherapy (CuS-MoS 2 -SH-PEG(DOX) but no NIR) or photothermal therapy (CuS-MoS 2 -SH-PEG with NIR). A cellular uptake study demonstrated that the nanoplatform can efficiently enter tumor cells, and that uptake is enhanced when NIR is applied. Overall, the functionalized MoS 2 material developed in this work exhibits great potential as an efficient system for dual responsive drug delivery and synergistic chemo-photothermal therapy. The route employed in our work thus provides a strategy to enhance photothermal efficacy for transition metal dichalcogenide drug delivery systems.
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