Journal of the Taiwan Institute of Chemical Engineers
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2023
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IF 5.7
Linjuan Wang,Mingpu Kou,Julie Tournet,Siva Karuturi,Ling Zan
Background Recognized for its high calorific value, clean and non-polluting properties, hydrogen is considered to be one of the most attractive solutions to the impending energy crisis. Photocatalytic water splitting has been widely investigated for its promise to produce hydrogen in a sustainable, environmentally friendly and low-cost approach. In pursuit of high photocatalytic efficiency, multiple strategies haven been explored such as doping, co-catalyst modification and heterojunction construction realizing promising improvements. Methods We synthesized CdS doped with Zn ions and modified with MoS 2 as co-catalyst to form Zn x Cd 1− x S solid solution and MoS 2 -Zn 0.25 Cd 0.75 S heterojunction using a simple one-step hydrothermal method. The synthesized catalyst was used water splitting under visible light irradiation. The structural and morphological characteristics of these materials, along with their photocatalytic mechanisms, were investigated using multiple techniques such as SEM, TEM, XPS, PL, etc. Findings The photocatalyst consisting of 0.9 wt.% MoS 2 -Zn 0.25 Cd 0.75 S achieved a production rate of 6276 μmol h −1 g −1 , which is 17.4 times higher than that of pure CdS and 1.6 times higher than that of Zn 0.25 Cd 0.75 S. The composite also demonstrated a high apparent quantum yield of 11.1 % at 420 nm. The mechanism of the water splitting process, revealed through various techniques, introduces novel pathways for crafting high-efficiency photocatalysts with an internal electron-hole separation heterostructure.
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高影响因子
Electrocatalysis
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2023
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IF 3.1
Zhao Hongyu,Zhang Hao,Huang Ruoyu,Wang Jianmin,Cai Jiajia,Hu Jing,Chen Zhijie,Li Yongtao,Li Haijin
Developing excellent electrocatalysts is a significant step in accelerating the widespread implementation of the electrochemical hydrogen evolution reaction (HER). MoS 2 is one of the promising alternatives to platinum-based catalysts, while its HER activity is far from Pt due to the lack of active sites. It is urgent to develop a novel strategy to activate the basal planes of MoS 2 for enhancing the HER activity. Herein, a facile hydrothermal method with a low-temperature H 2 O 2 etching method is developed to fabricate MoS 2 with O-doped and S-vacancy dual defects. The dual defects MoS 2 nanosheet demonstrates remarkable hydrogen evolution reaction (HER) activity, achieving 10 mA cm −2 with a small overpotential of around 143 mV in 0.5 M H 2 SO 4 . Graphical Abstract
Construct dual-defect MoS2 via a facile hydrothermal method and mild H2O2 etching process.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Nankun Chen,Yiyao Xiao,Chao Wang,Jiahao He,Ningning Song
Ternary hierarchical Fe3O4@C@MoS2 composites and binary hierarchical Fe3O4@C composites were successfully fabricated by a modified mixed solvothermal method, a self-oxidation polymerization method, and a hydrothermal process. Their magnetic properties and microwave absorption performance were investigated. Dual resonance behavior was observed in the Fe3O4@C@MoS2 composites. One of the resonances was attributed to natural resonance with a resonance frequency of 2.58 GHz, which was much higher than that for Fe3O4 bulk (1.5 GHz). The other originated from the superparamagnetic/ferromagnetic relaxation with a resonance frequency of 12.45 GHz. The minimum reflection loss (RLmin) reached −64.30 dB with a matched thickness of 2.24 mm at 11.64 GHz, and the maximum effective absorption bandwidth (EABmax) covered 6.39 GHz with a matched thickness of 1.89 mm. In addition, the maximum Radar cross section (RCS) reduction value reached 31.90 dB m2 at a scattering angle of 0°. Electron holography analysis confirmed a dense magnetic absorption network in the Fe3O4@C@MoS2 composites. The boost in microwave absorption performance was caused by the synergistic effects of magnetic and dielectric properties owing to the ternary hierarchical structure, shape magnetic anisotropy, and incorporation of 1T/2H MoS2. Besides, the binary hierarchical Fe3O4@C composites also exhibited good absorbing performance caused by natural resonance, with an RLmin of −52.90 dB at 5.80 mm, an EABmax of 5.98 GHz at 3.38 mm, and a relatively high RCS reduction value of 13.04 dB m2 at θ = 20°. This work paves the way for designing multicomponent hierarchical absorbers with broadband and intensive microwave absorption.
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高影响因子
Small
·
2023
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IF 13.3
Zizhuang He,Hanxiao Xu,Lingzi Shi,Xiangru Ren,Jie Kong,Panbo Liu
The synergistic effect of hollow cavities and multiple hetero-interfaces displays huge advantages in achieving lightweight and high-efficient electromagnetic wave absorption, but still confronts huge challenges. Herein, hierarchical Co 2 P/CoS 2 @C@MoS 2 composites via the self-sacrificed strategy and a subsequent hydrothermal method have been successfully synthesized. Specifically, ZIF-67 cores first act as the structural template to form core-shell ZIF-67@poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (ZIF-67@PZS) composites, which are converted into hollow Co 2 P@C shells with micro-mesoporous characteristics because of the gradient structural stabilities and preferred coordination ability. The deposition of hierarchical MoS 2 results in phase transition (Co 2 P→Co 2 P/CoS 2 ), yielding the formation of hierarchical Co 2 P/CoS 2 @C@MoS 2 composites with hollow cavities and multiple hetero-interfaces. Benefiting from the cooperative advantages of hollow structure, extra N,P,S-doped sources, lattice defects/vacancies, diverse incoherent interfaces, and hierarchical configurations, the composites deliver superior electromagnetic wave capability (−56.6 dB) and wideband absorption bandwidth (8.96 GHz) with 20 wt.% filler loading. This study provides a reliable and facile strategy for the precise construction of superior electromagnetic wave absorbents with efficient absorption attenuation.
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ChemCatChem
·
2023
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IF 4.5
Shuyan Zhang,Yueqi Pan,Yihan Chen,Zhiwei Yang,Dongcai He,Nan Feng,Weijie Wang,Yunfeng Li,Danna Chen,Xianchun Chen,Jing Zhang
Graphical BP/MoS 2 heterojunction is prepared by solvothermal method using NMP, BP nanosheets and (NH 4 ) 2 MoS 4 . Under NIR irradiation, BP/MoS 2 can be heated up to 51.8 °C within 5 minutes by photothermal conversion. In addition, the existence of ⋅O 2 − and 1 O 2 in BP/MoS 2 -NIR system is verified to sterilize efficiently. With a loading content of 10 wt % MoS 2 , bacterial cells, especially drug-resistant bacteria (10 6 cfu ⋅ mL −1 ) completely can lose the viability within 10 min of NIR irradiation. In this research, a high-efficiency nano-fungicide with synergistic effect was obtained by combining polycrystalline MoS 2 with layered nano-BP to form heterojunction, which had a new photothermal-photocatalytic antibacterial mechanism to Gram-positive bacteria, Gram-negative and drug-resistance bacteria under NIR. BP/MoS 2 whose lethality of bacteria could reach nearly 100 % at 400 μg/L, exhibited the highest photothermal lysis efficiency against E. coli, B. pumilus and A. baumannii. It was found that the heterojunction could be heated up to 51.8 °C within 5 minutes by photothermal conversion, and it also had an excellent performance of photothermal cycle. High temperature and stability of the material endowed it with an outstanding and long-lasting bactericidal effect. In addition, a series of in vitro free radical experiments was designed, the existence of ⋅O 2 − and 1 O 2 in BP/MoS 2 -NIR system was verified. And the Way of ROS production and the mechanism of action were discussed by EPR test. Subsequently, two mechanisms of synergistic antibacterial action were summarized, that is, abundant ROS and high temperature could destroy cell wall damage and lysis of bacteria effectively. This study provides a theoretical basis for the synergistic antibacterial action of NIR photothermal and photocatalysis of BP system.
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DESALINATION
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2023
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IF 9.9
Jinsong He,Tingyan Deng,Linzhi He,Xiaochan An,K.G. Nadeeshani Nanayakkara,Fei Shen,Yanzong Zhang,Jianmei Zou,Li Zhao
From the view of sustainable development, the loose nanofiltration (LNF) membrane with high permeability and excellent separation of dye/salt mixture becomes more attractive for dye-containing wastewater. However, the previous LNF membranes inevitably suffered from the permeability-selectivity trade-off due to the inherent nature of polymer-based selective layer. This study reported a tannic acid (TA)-MoS 2 nanosheets (NSs) interlayered nanocomposite polyester (PE) LNF membrane (iLNF-3) that exhibited a remarkably enhanced water permeance of 55.8 LMH·bar −1 compared to the control LNF membrane of 27.3 LMH·bar −1 , and a higher separation selectivity of dye/salt (rejection rate: 99.6 % for congo red, 98.0 % for methyl blue, 5.6 % for Na 2 SO 4 , respectively). Furthermore, the iLNF-3 showed high ionic interference resistance, long-term stability, and superior antifouling performance. The enhanced permeance and dye/salt separation were mainly attributed to the introduction of a high-permeability TA-MoS 2 NSs interlayer . In particular, the permeability was improved due to the “gutter” effect and nanochannels and the formed thinner PE selective layer caused by TA-MoS 2 NSs interlayer. Notably, the selectivity was enhanced owing to the looser porous structure of PE layer resulting from the slow diffusion rate of aqueous monomer . This study can provide a foundational framework for the development of iLNF membranes for treating dye containing wastewater.
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NANOTECHNOLOGY
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2023
·Vol. 34
·期 40
·405402
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IF 3.5
Jian Lin,Yanfei Li,Yihan Song,Jingping Zhang,Haiming Xie,Haizhu Sun
Although significant achievements in improving the stability of MoS2 anodes have been made, the cycling life in most studies is still less than 1000 cycles. This is because MoS2 anodes directly contact the electrolyte and generate byproducts, leading to the loss of active mass and capacity decay. Herein, the inner–outer dual space protection of MoS2 fibers is realized by regulating the surface and interface structure of electrospinning precursors (noted as X-MoS2/CNFs). Inside the fibers, Mo–N covalent bond is constructed to anchor the active material, preventing MoS2 from falling off the matrix after multiple cycles. Simultaneously, surface of the fibers, a stable solid electrolyte interface layer is induced to prevent contact between active materials and electrolytes. In addition, the initial Coulombic efficiency is enhanced as high as 84.4%. The profound investigations of morphological evolution and internal real-time resistance confirm the double structural protection of 800-MoS2/CNFs. As a result, a decent cycling performance (408.9 mAh g−1 at 1000 mA g−1 for 2000 cycles) and the satisfied rate capacities (100–1000 mA g−1) are achieved. This work provides a new idea for the preparation of stable anodes for alkali metal ion secondary batteries.
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高影响因子
Lubricants
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2023
·Vol. 11
·期 12
·524
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IF 3.5
Yaping Xing,Ebo Liu,Bailin Ren,Lisha Liu,Zhiguo Liu,Bocheng Zhu,Xiaotian Wang,Zhengfeng Jia,Weifang Han,Yungang Bai
In this study, willow catkins/MoS2nanoparticles (denoted as WCMSs) have been prepared using a hydrothermal method. The WCMSs were modified with oleic acid (OA) to improve dispersion in base oil. The friction and wear properties of WCMSs in liquid paraffin (LP) for steel balls were investigated using a four-ball wear tester. The results have shown that at a high reaction temperature, willow catkins (being used as a template) and urea (being used as a nitrogen resource) can effectively decrease the wear scar diameters (WSDs) and coefficients of friction (COFs). At a concentration of 0.5 wt.%, the WSD and COF of steel balls, when lubricated using LP containing modified WCMS with urea, decreased from 0.65 mm and 0.175 of pure LP to 0.46 mm and 0.09, respectively. The addition of urea and hydroxylated catkins can generate a significant number of loose nano-sheets and even graphene-like sheets. The weak van der Waals forces, decreasing the shear forces that the steel balls must overcome, provide effective lubrication during rotation. On the other hand, the tribo-films containing MoS2, FeS, azide, metal oxides and other compounds play important roles in reducing friction and facilitating anti-wear properties.Keywords:willow catkins;MoS2;hydrothermal;urea;wear
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xiaonan Hu,Yang Ye,Gang Lu,Gang Ren,Chuanyi Wang,Mingshan Zhu
To tackle high salinity challenge, differently from singlet oxygen-governed systems, extremely abundant and highly reactive sulfate radicals (SO 4 •─ )-dominated systems might be also feasible. Ingenious integration of two active popular catalysts, and optimal selection of reaction parameters could sufficiently activate the added peroxymonosulfate (PMS) to efficiently degrade complicated pollutants within a short time so as to overlook the negative effects of inorganic anions. Herein, zero-valent iron decorated metallic 1T/semiconducting 2H hybrid phased molybdenum disulfide with different Mo/S feeding ratio (Fe 0 /Nx-MoS 2 ) were constructed and compared to activate PMS for carbamazepine (CBZ) removal, where Fe 0 /N2-MoS 2 (M(Mo):M(S) = 7:30) with ultrathin sheet morphology presented most charming decontamination performance. Optimal Fe 0 /N2-MoS 2 dosage and PMS amount was respectively selected as 75 and 50 mg·L -1 in treating 10 mg·L -1 CBZ at pH = 3.00 via tailoring reaction parameters. CBZ could be completely removed in a short time of 10 min with a high pseudo-first-order kinetic rate constant of 0.939 ± 0.016 min −1 . The system exhibits the promising anti-interference capacity toward Cl ─ , NO 3 ─ and SO 4 2─ of high concentration (even up to 3000 mg·L -1 ). Electron paramagnetic resonance and scavenging experiments of reactive species suggested that SO 4 •─ played a dominant function. Furthermore, Mo and Fe bimetallic cycles could efficiently promote PMS activation to produce rich reactive radicals. Degradation pathways and toxicity evolutions for CBZ in the (Fe 0 /N2-MoS 2 + PMS) system were proposed via liquid chromatography time-of-flight mass spectrometer and Toxicity Estimation Software Tool, and we hope that the system would be applied in high salinity wastewater treatment in future.
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Journal of Physical Chemistry C
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2023
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IF 3.7
Alhadi Ishag,Yanxue Yue,Weiyu Zhu,Chongyu Li,Bo Zhang,Xinshui Huang,Yubing Sun
A novel nanoscale zero-valent iron/molybdenum disulfide (nZVI/MoS2) composite was synthesized and well characterized in detail. The as-prepared materials were applied for the removal of U(VI) from water solutions under various experimental conditions. The characterizations showed that nZVI/MoS2 composites exhibited a high surface area and uniform distribution of nZVI. The maximum adsorption capacities of nZVI/MoS2 obtained from the Langmuir model (71.8 mg/g at pH 4.0 and 25 °C) were higher than that of MoS2 (39.92 mg/g) due to the synergistic effect. According to the fitting of surface complexation modeling, U(VI) removal on nZVI/MoS2 included cation exchange and inner-sphere surface complexation at low and high pH, respectively, whereas the adsorbed U(VI) was partly reduced into U(IV) by nZVI/MoS2 composites. According to analysis of XPS analysis, the enhanced removal of U(VI) on nZVI/MoS2 was due to the complexation of U(VI) with various oxygenated functional groups (e.g., −OH, Fe–O, and Mo–O functional groups) and then adsorbed U(VI) was reduced to U(IV) by Fe0 and/or Fe(II). These findings showed that nZVI/MoS2 could be used as efficient adsorbents for the high elimination of U(VI) from contaminated wastewater in environmental pollution cleanup.
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Materials
·
2023
·Vol. 16
·期 17
·5773
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IF 3.4
Cunao Feng,Yu Guo,Xiaowei Li,Yang Cao,Qiuxue Kuang,Minghui Zhang,Dekun Zhang
The roller is an important part of the belt conveyor used in coal transportation. Due to the harsh environment of coal mines, the rollers are in a state of high load and high friction for a long time, which causes wear failure and has a serious impact on the reliability and safety of the equipment. In order to prepare roller material with excellent bearing performance and friction performance, CF/PUE composites were prepared by pouring method with polyurethane as the matrix and carbon fiber as reinforcement. Due to the low surface activity of unmodified carbon fibers and poor bonding performance with the matrix, MoS2was generated on the surface of carbon fiber by the in situ generation method in this paper. It was found that the mechanical properties of MoS2/CF/PUE composites were better when the CF content was 0.3 wt%. The Shore hardness reached 92.2 HA, which is 10% higher than pure polyurethane. The tensile strength was 38.44 MPa, which is 53% higher than pure polyurethane. The elongation at break was 850%, which is 16% higher than pure polyurethane. The maximum compressive stress was 2.32 MPa, which is 42% higher than pure polyurethane. The friction coefficient was much lower than that of pure PUE composites, the friction coefficient was 0.284, which is 59% lower than pure polyurethane.Keywords:PUE;CF;MoS2;mechanical properties;friction performance
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高影响因子
Journal of Water Process Engineering
·
2023
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IF 7
Yang Liu,Xuanlin Huang,Xinbo Zhang,Huu Hao Ngo,Xinyue Fu,Haitao Wen,Chensheng Jin
Efficient cleaning strategies play a key role in implementing sustainable and economic membrane operations during water treatments and purification. We proposed in this paper to construct the functional layers on the surface of PES substate using MoS 2 nanosheets synthesized by a hydrothermal method, namely MoS 2 /PES membrane. The membrane structure and properties were characterized by SEM, XRD , EDS and FTIR. This is then followed by an evaluation of the membrane fouling of the functional layers, and in turn exploring the membrane cleaning strategy. The specific catalytic effects between MoS 2 nanosheets with peroxidase-like activity, and the cleaning agent (H 2 O 2 ) was subtly combined to endow MoS 2 functional layers with specific catalysis. Humic acid (HA, as a representative organic foulant) having the filtration efficiency (~91 %) of MoS 2 /PES membrane was ~6 % higher than that of the pristine PES membrane. The flux recovery rate of MoS 2 /PES membrane (~75 %) was significantly larger than the PES membrane (~16 %) under optimized conditions. Results of 7 cycles of consecutive membrane fouling and cleaning demonstrated MoS 2 functional layers not only relieved membrane fouling but also exhibited higher water flux . The outstanding performance of MoS 2 functional layers could be explained by their stacked honeycomb pore-like structure and the catalytic characteristics of MoS 2 -like peroxidases. H 2 O 2 was used to trigger the in-situ catalytic function of MoS 2 layers, generating strong ROS and oxygen for the enhanced removal of organic foulants. This study provides new insights into devising a novel membrane cleaning strategy using advanced functional nanomaterials .
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危险品化学品经营许可证（带存储）