Journal of Materials Research and Technology-JMR&T
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2024
·
IF 6.2
Xiaofeng Cai,Shuangjian Li,Wei Zeng,Ke Huang,Li Zhao,Dahai Zeng,Xiaohui Tu
The poor dispersion stability and susceptibility to oxidation significantly restrict the practical application of MoS 2 as a lubricant additive. Here, MoS 2 nanocomposite powders with magnesium silicate hydroxide (MSH) reinforcement and amorphous carbon protection were prepared via a straightforward two-step procedure. Detailed studies of the structure, phase composition, tribological properties, and lubrication mechanism of the composite powder have been conducted. The results demonstrated that the morphology of the composite powders was rod-shaped MSH coated with amorphous carbon and layered MoS 2 . The introduction of amorphous carbon into the MSH/MoS 2 composite powders results in enhanced dispersion and a reduction in corrosion to copper sheets. Furthermore, the addition of 1.0 wt% MSH/MoS 2 /C nanoparticles to PAO-6 led to a decrease in the COF of the lubricating oil from 0.104 to 0.063. Meanwhile, the wear rate of the friction pair decreased from 5.91 × 10 −7 mm 3 N −1 m −1 to 2.22 × 10 −7 mm 3 N −1 m −1 . The excellent performance could be attributed to the introduction of amorphous carbon effectively prevents the oxidation of MoS 2 within the additive, leading to improved friction and wear resistance. The tribo-film, composed of MSH, Fe 2 O 3 , FeS, MoS 2 , graphite, and amorphous carbon, demonstrates remarkable capabilities in reducing friction and wear.
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DESALINATION
·
2024
·
IF 8.3
Siyu Cao,Li Wang,Yufei Shu,Meng Zhang,Mengxia Wang,Qi Han,Xun Liu,Zhongying Wang,How Yong Ng
Recent studies reveal the enhancement in water permeability for thin-film nanocomposite (TFN) membranes that incorporate an interlayer (TFNi), mainly when developed using substrates with larger pores. Nevertheless, the impact of substrate pore size on the membrane's morphology and separation performance requires further exploration. The study systematically investigates how the pore size of polycarbonate track-etched (PCTE) substrates influences these factors. Findings suggest that larger pores lead to rougher membrane surfaces and higher water permeance by reducing hydraulic transport resistance. However, optimal performance on larger pores requires a thicker MoS 2 interlayer, leading to a thinner polyamide layer. Specifically, on PCTE-200 substrates, the MoS 2 interlayer made up of large MoS 2 nanosheets creates a more tortuous path for water molecules, limiting permeance. Conversely, smaller pores than the MoS 2 nanosheets' dimensions obstruct the storage and diffusion of PIP monomers, negatively affecting the polyamide film and salt rejection. These findings underscore the significance of choosing the suitable substrate and adjusting interlayer thickness for creating TFN membranes with desired separation characteristics. The study provides valuable insights into the role of substrate selection and interlayer thickness in TFNi membrane design, offering guidelines for developing high-performance membranes for various separation tasks.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Junhong Lu,Yinjuan Chen,Yanlin Zhang,Jie Huang,Haoyang Jiang,Dafang He,Haiqun Chen
Due to the presence of polysulfide shuttling, serious electrode expansion, and the low electrical conductivity of sulfur materials at room temperature, the commercialization of Li-S batteries is still not feasible. In this study, we have synthesized unique hollow molybdenum disulfide nanocages/reduced graphene oxide (H-MoS 2 /rGO) composites to be employed as highly effective cathodes for Li-S batteries. In this well-designed structure, the hollow MoS 2 nanocages are tightly bound by C-O-Mo bonds and uniformly distributed across the graphene sheets. The dual-function MoS 2 nanocages can adsorb polysulfides by Mo-S bond and accelerate the conversion reaction of S 8 and Li 2 S. Moreover, the 3D rGO network with abundant pores effectively reduces the diffusion path and enhances the rapid transport of electrons and ions. The hybrid H-MoS 2 /rGO cathodes with these advantages exhibit a remarkable initial discharge capacity of 801.7 mAh g -1 at 1 C, as well as a high specific discharge capacity of 533.2 mAh g -1 is remained over 500 cycles.
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CATALYSIS TODAY
·
2024
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IF 5.2
Jiaxin Zheng,Miao Wang,Xinli Tong,Ye Yuan
The catalytic selective etherification of 5-hydroxymethyl furfural (5-HMF) is considered as a feasible route to prepare the biofuels from biomass feedstocks. In this work, a novel solid acid catalyst derived from the flower-like MoS 2 is synthesized by combination of the facile hydrothermal method and reduction process. Therein, the number of Lewis and Bronsted acidic sites derived from the exposed Mo edges of MoS 2 can be efficiently regulated by changing the hydrogen annealing conditions. The prepared MoS 2 -450-R catalyst exhibited a prominent activity for the conversion of 5-HMF to 5-(methoxymethyl)furanal dimethyl acetal (5-MFDMA) through the tandem acetalization and etherification under N 2 atmosphere, in which a 99.0 % conversion with 83.7 % selectivity of 5-MFDMA is obtained. Further investigations revealed that the abundant acidic sites of MoS 2 -450-R plays a crucial role on the reaction of 5-HMF with methanol. Finally, based on the characterization of catalyst and reaction phenomena, a possible reaction network for the acetalization and etherification of 5-HMF with the methanol has been proposed.
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RSC Advances
·
2024
·Vol. 14
·期 15
·10703-10713
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IF 3.9
Jiayu Chen,Chun Ji,Xiao Wang,Yunxia Tian,Han Tao
Chlorpyrifos (CPF) is the most common pesticide entering the food chain and posing a threat to human health. This study presents a new electrochemical biosensor based on molybdenum disulfide nanosheets and nitrogen-doped carbon dot nanocomposite (MoS2@N-CDs) and kidney bean esterase (KdBE), and it is shown to achieve accurate detection of CPF. MoS2@N-CDs were prepared by a facile solvothermal method and characterized by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical characterization confirmed that MoS2@N-CDs facilitated electron transfer and increased the electroactive surface area of the electrode, thereby improved the sensing performance of the electrode. The oxidation peak current of 1-naphthol, which was produced by the hydrolysis of 1-naphthyl acetate catalyzed by KdBE, was adopted as the signal of the sensor. CPF can suppress KdBE activity and consequently cause a decrease in the sensing signal. The experimental results show that the variation of sensing signal is a reliable index to evaluate the CPF level. Under the optimized conditions, the developed enzyme sensor showed superior CPF assay performance with a linear detection range as wide as 0.01–500 μg L−1 and LOD as low as 3.5 × 10−3 μg L−1 (S/N = 3). The inter- and intra-batch RSDs for electrode testing were 4.02% and 2.69%, respectively. Moreover, the developed biosensor also showed good stability and anti-interference. The spiked recoveries of CPF in oilseed rape and cabbage ranged from 98.09% to 106.01% with low relative standard deviation (RSD) (<5.23%), suggesting that the sensor is a promising tool to enable simple, low-cost but highly sensitive large-scale screening of CPF residues in food.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Caicai Zhang,Ao Xu,Shuting Mao,Zhenping Li,Jiawen Yan,Fuyi Jiang,Yijing Wang,Kaiyuan Zhang,Yanli Zhou
Two-dimensional layered-structure MoS 2 has been explored as the promising cathode materials for magnesium ion batteries benefited by its wide layer distance and satisfactory capacity. However, such strong interaction between Mg 2+ and MoS 2 brings about the sluggish diffusion kinetics and irreversible electrochemical reaction, leading to a decreased specific capacity and poor rate capability. How to adopt its structure engineering and interface engineering to boost the Mg 2+ diffusion kinetics and enhance the electrochemical reversibility of MoS 2 is still a huge challenge. Herein, the amorphous sulfur-rich 1T/2H-MoS 2 mesoporous nanospheres (a-MoS 2+x , 0
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Environmental Science-Nano
·
2024
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IF 5.8
Sichen Liu,Haotian Wang,Yumeng Xiao,David G. Calatayud,Boyang Mao,Gaoqi Zhang,Chenhui Yang,Lidong Wang,Meng Li
Drinking water contamination and water shortages are seriously exacerbated by industrial wastewater discharge. However, due to the high complexity of wastewater treatment systems, effective high-concentration pollutant removal and simplified wastewater recycling remain major challenges. Inspired by mangrove interconnected purification mechanisms, a novel cascade water treatment system has been developed using MoS2–g–C3N4 (MoG), an amphiphilic material, as the main and single component to directly produce drinking water from wastewater with high efficiency. This cascade system integrates membrane filtration and solar-powered water evaporation processes to produce clean water, while also overcoming the requirement for less polluted source water that is typically required for standalone solar evaporation-based clean water production. The MoG membrane, featuring an amphiphilic platform, exhibits a high removal rate for organic and heavy metal contaminants and achieves a water flow of 966 L m−2 h−1 bar−1 and an 80% efficiency in pollutant removal. The MoG-based aerogel enables nano- and micro-channels and exhibits a clean water production rate of 1.48 kg m−2 h−1 under 1 sun irradiation. The compact cascade system for practical use can produce drinking water that meets WHO standards from heavily polluted wastewater with an average hourly water production rate of 1.39 kg m−2 h−1. Life cycle assessment confirms that the cascade system displays significant environmental profile improvement with reduced CO2 equivalent (CO2e) levels with only 1/25 of that observed in conventional water treatment systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Hui Feng,Meng Luo,Guonian Zhu,Kerage Dorothy Mokeira,Yaoxin Yang,Yongxin Lv,Qing Tan,Xiangwen Lei,Hang Zeng,Hefa Cheng,Shuxia Xu
This study described the development of a photocatalytic electrochemical aptasensor for the purpose of detecting chloramphenicol (CAP) antibiotic residues in water by utilizing SYBR Green I (SG) and chemically exfoliated MoS 2 (ce-MoS 2 ) as synergistically signal-amplification platforms. The Au nanoparticles (AuNPs) were electrodeposited onto the surface of an indium tin oxide (ITO) electrode. After that, the thiolate-modified cDNA, also known as capture DNA, was combined with the aptamer. Subsequently, photosensitized SG molecules and ce-MoS 2 nanomaterial were inserted into the groove of the resultant double-stranded DNA (dsDNA). The activation of the photocatalytic process upon exposure to light resulted in the generation of singlet oxygen. This singlet oxygen effectively splits the double-stranded DNA, resulting in a significant enhancement in the current of [Fe(CN) 6 ] 3-/4- . When the CAP was present, both SG molecules and ce-MoS 2 broke away from the double-stranded DNA, which turned off the photosensitization response, leading to a significant decrease in the current of [Fe(CN) 6 ] 3-/4- . Under optimal conditions, the aptasensor exhibited a linear relationship between CAP and logarithmic concentrations from 20 to 1000 nM, with a detection limit (3 σ ) of 3.391 nM. The aptasensor also demonstrated good selectivity towards CAP in the presence of interfering antibiotics such as tetracycline, streptomycin, levofloxacin, ciprofloxacin, and sulfadimethoxine. Additionally, the results obtained from the analysis of natural water samples using the proposed aptasensor were consistent with the findings acquired through the use of a liquid chromatograph-mass spectrometer. Therefore, with its simplicity and high sensitivity, this biosensor can potentially detect alternative antibiotics in environmental water samples by replacing the aptamers based on photosensitization.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Shaobo Ye,Zhentao Du,Zhengxiang Cai,Deliu Ou,Haonan Guo,Qiao Liu,Weiyou Yang,Qing Shi
Molybdenum disulfide (MoS2), a typical earth-abundant material, is an excellent candidate for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which fundamentally rely on the regulation of the morphology and electronic structure of MoS2. Herein, Mn-doped amorphous MoS2 coated on Mn-doped crystalline Ni3S2 nanorods (Mn–Ni3S2@MoS2), rationally designed core–shell nanorods, have been fabricated via a facile one-step hydrothermal method as highly efficient bifunctional activities for HER and OER in alkaline solution. The target electrodes deliver a high current density of 100 mA cm–2 at a low overpotential of 187 and 310 mV for HER and OER, respectively, outperforming most MoS2-based catalysts. Moreover, a water-splitting cell based on the Mn–Ni3S2@MoS2 electrode requires a voltage of 1.45 V to reach a current density of 10 mA cm–2, which is superior to the state-of-the-art one of those based on noble metal Pt/C–NF∥RuO2–NF and non-noble metal catalysts. The overall enhanced bifunctional catalytic performance is mainly attributed to the abundant catalytically active sites provided by the Mn-doped amorphous MoS2 and the fast pathway for electron/proton transfer facilitated by the Mn-doped crystalline Ni3S2 nanorods. The incorporated Mn dopants and assembled Ni3S2/MoS2 heterostructure effectively regulate the electronic structure with redistributed charge within the core–shell Mn–Ni3S2@MoS2 electrode.
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ANALYTICA CHIMICA ACTA
·
2019
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IF 5.256
Feng Zhang,Mengke Wang,Lili Zhang,Xingguang Su
Herein, we developed a novel and sensitive ratiometric fluorescence strategy for pH sensing and urea detection based on MoS 2 quantum dots (MQDs) and 2, 3-diaminophenazine (DAP). The DAP was pH-sensitive and can be used as pH indicator while MQDs was pH-insensitive and acted as a reference fluorescent signal. The fluorescence intensity of DAP at 568 nm exhibited increases gradually while the fluorescence intensity of MQDs at 420 nm kept unchanged as the pH changed from 3.0 to 9.0. So the ratio of the two fluorescence intensities at 568 nm and 420 nm can be used to monitor the change of pH. The pH-sensing system showed a linear and reversible respond to pH in the range of 3.8–6.0 with an interval of 0.2 pH unit. Furthermore, the enzymatic reaction of urea in the presence of urease can lead to the pH increase of the solution, which can be used to detect urea by using the above-mentioned pH-sensing system. There exhibited a good linear relationship between the ratiometric fluorescence intensity of I 568 /I 420 and urea concentrations ranging from 5 to 700 μM. And a low detection limit of 1.8 μM was obtained. The proposed strategy exhibited excellent selectivity and sensitivity. Additionally, the developed ratiometric fluorescence strategy was successfully applied to detect urea in water samples.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Atiq Ur Rehman,Muhammad Anwar,Adil Khan,Kashif Ali Kalhoro,Chi Zhang,Yanke Zhang,Mohammadreza Shokouhimehr,Zhengchun Liu
Uric acid (UA) and dopamine (DA) are clinical biomolecules associated with various physiological and pathological processes. This study investigates the electrochemical sensing performance of UA and DA based on a dual-modified electrode with holey molybdenum disulfide (h-MoS 2 ) and electrodeposited nickel nanoparticles (NiNPs) GCE/ENi-hMoS 2 . To fabricate an electrochemical sensor, h-MoS 2 nanosheets were synthesized using a simple ultrasonic process from bulk MoS 2 for UA and DA detection. The electrochemical sensing performance of h-MoS 2 and NiNPs modified electrodes were characterized using techniques, such as cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. Due to the synergetic contribution of h-MoS 2 and NiNPs, the sensor achieved remarkable sensitivity and also exhibited strong anti-inference ability. The sensor exhibited linear ranges between 100–9000 μM and 50–3600 μM, with low detection limits of 7.3 μM and 2.1 μM for UA and DA simultaneously. Additionally, the developed GCE/ENi-hMoS 2 -based electrochemical sensor exhibited high selectivity in the existence of interfering substances, including glucose and ascorbic acid with good stability. This study offers a reference for the fabrication of stable electrochemical sensors consolidated by two-dimensional materials for small-molecule detection.
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Molecular Catalysis
·
2024
·
IF 3.9
Xin-Ni Shao,Yin-Feng Wang,Ming-Yu Qi,Zi-Rong Tang
Simultaneous utilization of photogenerated electrons and holes within a photoredox system enables effective hydrogen (H 2 ) production and organic synthesis, aligning with eco-friendly chemistry principles and current energy challenges. Here, we report the preparation and application of cocatalyst MoS 2 decorated CdS (MoS 2 CdS) composites for the photoredox-mediated C–N coupling of amines to imines and H 2 generation under visible light illumination. The H 2 and N-benzylidenebenzylamine yields for the optimal MoS 2 CdS are 28.9 and 15.0 times higher than those of bare CdS, respectively. Mechanism studies reveal that the enhanced photocatalytic activity results from the MoS 2 acting as an electron sink, which accelerates the separation and migration of photogenerated charge carriers. Additionally, the pH(•CH)NH 2 intermediates are found to play a pivotal role in the dehydrogenative coupling of benzylamine. Furthermore, the MoS 2 CdS composites exhibit universal applicability in the conversion of various aromatic amines into corresponding imines integrated with H 2 evolution.
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