Polymers
·
2022
·Vol. 14
·期 11
·2204
·
IF 4.967
Yi Qian,Wenyuan Su,Long Li,Rongmin Zhao,Haoyan Fu,Jiayin Li,Peidong Zhang,Qingjie Guo,Jingjing Ma
In this work, a novel three-dimensional (3D) hollow nickel-cobalt layered double hydroxide (NiCo-LDH) was synthesized using zeolitic imidazole framework-67 (ZIF-67) as a template, and then utilized to functionalize molybdenum disulfide (NiCo-LDH/MoS2) via electrostatic force. Flame retardant thermoplastic polyurethane (TPU) composites were prepared by the melt blending method. Compared to pure TPU, NiCo-LDH/MoS2filled TPU composite was endowed with a decrease of 30.9% and 55.7% of the peak heat release rate (PHRR) and the peak smoke production rate (PSPR), respectively. Furthermore, the addition of NiCo-LDH/MoS2can significantly improve the thermal stability and char yield of the TPU composite. The catalytic carbonization effect and dilution effect of NiCo-LDH, and the barrier effect of MoS2nanosheets enable TPU composites with excellent flame retardancy and toxic gas suppression ability.Keywords:layered double hydroxide;molybdenum disulfide;thermoplastic polyurethane;flame retardancy
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 18
·2200026
·
IF 5.006
Chen Chang,Xin Guan,Jingya Lin,Hui Nie,Xingping Zhou,Xiaolin Xie,Yunsheng Ye
Multifunctional polymer composites with efficient heat dissipation and flame retardancy are highly desirable in the electronic industry. Here, by the combination of hydrothermal reaction and in situ fragmentation, molybdenum disulfide (MoS 2 ) decorated silver nanowires (AgNWs) and 3D reduced graphene oxide (RGO) (AgNW-RGO@MoS 2 ) aerogel micro-particles (AMPs) are successfully prepared. When the above AMP is introduced to epoxy (EP) resin by the simple blending method, a polymer composite with continuous thermally conductive pathways and flame barrier layers is achieved. With an AMP loading of 4.0 vol.%, the polymer composite displays superior enhancement in thermal conductivity up to 420%. Compared to neat EP, the peak heat release rate and total heat release decreases by 61.1% and 58.8%, respectively. This work provides new insights into the design and large-scale fabrication of multifunctional polymer composites for efficient thermal management materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 16
·2110853
·
IF 19.924
Simi Sui,Haonan Xie,Ming Liang,Bochao Chen,Chunyang Liu,Enzuo Liu,Biao Chen,Liying Ma,Junwei Sha,Naiqin Zhao
Constructing sodium-ion battery anodes with efficient ion/electron transport and high cycling stability is significantly promising for applications but still remains challenging. Here, “three-in-one” multi-level design is performed to develop a carbon-coated phosphorous-doped MoS 2 anchored on carbon nanotube paper (P-MoS 2 @C/CNTP). The Na + diffusion and electron transport, as well as the structural stability of the whole anode are simultaneously enhanced through the synergistically optimization of P-MoS 2 @C/CNTP at atomic, nanoscopic, and macroscopic levels. Resulted from the multi-level modification, the synergetic mechanism has been demonstrated by electrochemical measurement and theoretical calculation. As a result, the free-standing P-MoS 2 @C/CNTP anode presents a high rate performance (150 mA h g −1 at 5 A g −1 ) and a long cycling life (1 A g −1 , 1200 cycles, 249 mA h g −1 ). This work provides a new approach to the design and fabrication of high-performance conversion-type electrode materials for rechargeable batteries application.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zenglong Wu,Wenkai Song,Xiangwei Xu,Jiangnan Yuan,Weiyang Lv,Yuyuan Yao
Applicating co-catalyst into Fenton-like advanced oxidation processes to improve the performance for wastewater remediation has attracted widespread attention. Among them, developing highly active and green heterogeneous catalyst integrating homogeneous ferrous ions and inorganic co-catalyst is a great challenge. Herein, ascorbic acid additive was creatively introduced into the precursor composed of thiourea, sodium molybdate and ferric chloride to synthesize carbon intercalated molybdenum disulfide anchoring iron (C-MoS 2 @Fe) by a simple one-step hydrothermal method. C-MoS 2 @Fe exhibited an amazing apparent first-order constant as high as 0.739 min −1 about 10 times higher than that of the homogeneous Fe 2+ /MoS 2 system for the sulfamethoxazole (SMX) removal and achieved 68.7% removal of TOC in 6 min, which was attribute to the synergistic enhancement of high 1T phase (82.0%) and sulfur vacancies induced by the introduction of ascorbic acid. Notably, the C-MoS 2 @Fe was also capable of efficiently degrading multiple organic contaminants such as pharmaceuticals, phenolic compounds, and organic dyes. Compared with the homogeneous Fe 2+ /PMS system, the C-MoS 2 @Fe/PMS system expanded the effective pH range (2.0 ∼ 9.0) and the ultralow iron ions leaching (0.204 mg L -1 ) avoided the formation of iron containing sludge. The results of electron paramagnetic resonance (EPR), radical quenching and probe experiments indicated that •OH was the main active species with the contribution rate about 60.3%. Furthermore, possible degradation pathways were proposed based on the intermediate products of SMX investigated by LC-MS. This study provides novel insights for the development of highly active and green catalysts for wastewater remediation.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 2
·2100654
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IF 4.367
Pengfei Yan,Mengya Li,Jie Liu,Yadi Hu,Keyong Tang
Hydrogel is an ideal wound dressing material because of its 3D network structure, which is similar to that of the extracellular matrix. However, it is a challenge to design antibiotic-free hydrogels with both antibacterial activity and enhanced mechanical strength. In this study, a polyvinyl alcohol (PVA) hybrid hydrogel incorporated with molybdenum disulfide@polydopamine@silver (MoS 2 @PDA@Ag) is prepared for rapid killing of bacteria under irradiation with near-infrared (NIR) light. The interpenetration of MoS 2 -based nanoparticles and PVA molecular chain significantly improves the mechanical property of the hydrogel. The hydrogels demonstrate an excellent photothermal effect and antibacterial activity, and the photocatalytic properties are considerably enhanced by Ag doping. The hydrogel exhibits favorable antibacterial activity after irradiation with 808 nm NIR light for 15 min due to the synergistic effect of reactive oxygen species and hyperthermia. Meanwhile, in vitro 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay further demonstrated that all hydrogels are nontoxic when their effects are examined against mouse fibroblasts ( L929 ) cells. In addition, the MoS 2 @PDA@Ag/PVA hydrogel can promote wound healing compared with the pure PVA hydrogel, demonstrating its significant potential in mitigating bacterial infection of wounds.
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JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Zhenping Cai,Yongxin Ding,Jiayin Zhang,Panjie Yu,Yongde Ma,Yanning Cao,Ying Zheng,Kuan Huang,Lilong Jiang
Dispersed metal sulfides are promising catalysts for the hydroconversion of biolipids to produce second-generation biodiesel. In this work, oil-soluble Mo-based ionic liquids (ILs) were innovatively utilized as the precursors for in situ generation of MoS 2 catalysts for the hydroconversion of biolipids. Taking methyl palmitate as the model compound, the excellent activity of in situ generated MoS 2 from ionic liquid Mo-based precursors was obtained. The turnover frequencies (TOFs) reached up to 1.6 × 10 2 h −1 for methyl palmitate conversion and 83 h −1 for hexadecane (C 16 ) yield at 320 °C and 0.5 h (42% conversion) under solvent-dilute conditions. The structures of in situ generated MoS 2 catalysts were characterized to provide explanations for the catalytic results. Based on the product distributions, the pathway of methyl palmitate hydroconversion was proposed, and the kinetics of methyl palmitate hydroconversion was analyzed in further detail. Applying the Mo-based ILs in the hydroconversion of methyl palmitate and palm oil under solvent-free condition also granted high conversions of feeds and selectivities of HDO products.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Hongpeng Wang,You Zhou,Hongna Xing,Xianfeng Yang,Yan Zong,Juan Feng,Xiuhong Zhu,Zhenhua Shi,Xinghua Li,Xinliang Zheng
Optimizing impedance matching and boosting interfacial polarization by constructing hierarchical magnetic/dielectric heterostructures is a promising strategy to acquire high-performance microwave absorption. Herein, 3D flower-like core-shell Fe 3 O 4 @2H-MoS 2 architectures were constructed, in which magnetic Fe 3 O 4 submicrospheres are uniformly coated by 2H-MoS 2 nanosheets . Compared to bare Fe 3 O 4 and 2H-MoS 2 , the hierarchical Fe 3 O 4 @2H-MoS 2 heterostructures show boosting microwave absorption, which is related to the content of Fe 3 O 4 submicrospheres. When the thickness is only 1.9 mm, the Fe 3 O 4 @2H-MoS 2 heterostructures display an optimal reflection loss (RL) of −50 dB at 13.2 GHz and effective absorption bandwidth (EAB, RL ≤ −10 dB) of 4.2 GHz (11.4–15.6 GHz). Besides, an EAB can be achieved in 14.6–18.0 GHz with an ultrathin thickness of 1.5 mm. The superior microwave absorption of Fe 3 O 4 @2H-MoS 2 heterostructures is mainly originated from two aspects. First, the combination of magnetic Fe 3 O 4 and semi-conducting 2H-MoS 2 can induce better impedance matching in comparison with the bare Fe 3 O 4 and 2H-MoS 2 . Second, the embedded Fe 3 O 4 core can greatly boost the complex permittivity and dielectric loss of 2H-MoS 2 , leading to improved microwave attenuation capacity. The boosting dielectric loss is primarily due to the unique interfacial polarization, induced by the special core-shell hierarchical architectures. This work suggests that optimizing impedance matching and boosting interfacial polarization are effective strategies to improve the microwave absorption of 2H-MoS 2 , which can be realized by loading magnetic nanostructures and designing 3D hierarchical heterostructures.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-13
·
IF 5.833
Huang Hao,Camarada María Belén,Wang Dan,Liao Xiaoning,Xiong Wanming,Du Juan,Xiong Jianhua,Hong Yanping
A novel electrochemical sensor has been fabricated for sensitive determination of zearalenone (ZEA) in food samples based on molybdenum disulfide quantum dots (MoS 2 QDs) and two-dimensional titanium carbide (2D-Ti 3 C 2 T x MXene) co-modified multi-walled carbon nanotube (MWCNT) heterostructure. Physical and electrochemical characterizations reveal that 2D-Ti 3 C 2 T x and MoS 2 QDs co-modified MWCNTs yields synergistic signal amplification effect, together with large specific surface area and excellent conductivity for the heterostructure, endowing the developed sensor with high detection performance to ZEA. Under optimized conditions, the sensor shows a wide linear range from 3.00 to 300 ng mL −1 and a low limit of detection (LOD) of 0.32 ng mL −1 , which is far lower than the maximum residue limits (MRLs) settled by the European Commission. In addition, it exhibits excellent selectivity, high reproducibility with a relative standard deviation (RSD) of 1.1%, and good repeatability (RSD 1.1%). In real sample analysis recoveries ranged from 94.8 to 105% showing the proposed electrochemical sensor has high potential in practical applications. This work presents an effective and valuable pathway for the use of novel heterostructure in the biosensing field. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yichao Wang,Zipeng Xing,Huanan Zhao,Sijia Song,Meijie Liu,Zhenzi Li,Wei Zhou
Oxygen-doped MoS 2 @In 2 S 3 /Bi 2 S 3 core-shell dual Z-scheme tandem heterojunctions are fabricated via two-step hydrothermal methods. In 2 S 3 and Bi 2 S 3 nanosheets grow on the outer surface of oxygen-doped MoS 2 spheres, and the tight interface between the spheres could ensure stable electron transfer. MoS 2 with oxygen defects could inhibit the recombination of photo-induced electron-hole pairs. The unique core-shell structure increases the interface area and provides adequate surface reactive sites for the reactants. The resultant MoS 2 @In 2 S 3 /Bi 2 S 3 shows broad-spectrum response and excellent photothermal effect, which is beneficial to trigger the near-field temperature rise and promote the photocatalytic process. The MoS 2 @In 2 S 3 /Bi 2 S 3 exhibits excellent photocatalytic H 2 evolution rate of 973.42 μmol h −1 g −1 , and the degradation efficiency of tetracycline within 90 min is 99.6%, which is ∼ 10 times higher than that of pristine MoS 2 . It can be ascribed to the unique core-shell dual Z-scheme tandem heterojunction structure facilitates the transfer and spatial separation of photogenerated electron-hole pairs, and greatly prolongs the carrier lifetime. In addition, the long-term stability indicates the potential applications due to the core-shell dual Z-scheme tandem structure inhibiting the photocorrosion of sulfides.
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TALANTA
·
2020
·
IF 5.339
Ze Zhang,Yingcong Zhang,Hongwei Yu,Shengzhong Rong,Hongmin Gao,Lingqiang Meng,Jianmin Dai,Hongzhi Pan,Dong Chang
A novel sensitive electrochemical immunosensor has been designed for determination of tacrolimus (Tac) based on spherical carrier amplification strategy. In this work, a spherical signal carrier was prepared by conjugating gold nanorods (AuNRs) functionalized L-cysteine ( [email protected] ) onto polystyrene nanoparticles (PS) to form a nanostructure, greatly increasing the amount of loaded capture antibodies. The PS was a stable spherical functional polymer with large specific surface area and was labeled with [email protected] via coupling reagent to increase active groups, biocompatibility and conductivity . The capture antibodies could be attached on the PS- [email protected] via linkage reagent glutaraldehyde (GA). Furthermore, single-layer molybdenum disulfide (MoS 2 ) fixed by chitosan were utilized to construct the base of this immunosensor, increasing the carrying capacity and stability of the electrode. After electrochemical reduction , the conductivity and electron transfer rate of MoS 2 were obviously improved, which offered a platform for this immunosensor and further amplified the signal. Under the optimized conditions, the proposed immunosensor revealed a linear Tac-concentration behavior from 1.0 to 30 ng mL −1 with a detection limit of 0.17 ng mL −1 (S/N = 3). The immunoassay was successfully applied to the quantification of Tac in serum samples with acceptable precision. The results indicated that a potentially analytical platform may be used to recognize the concentration of other drugs.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Lina Ding,Yi Chang,Pengfei Yang,Weihua Gao,Mengmeng Sun,Yameng Bie,Lin Yang,Xiaoming Ma,Yuming Guo
Photothermal therapy (PTT) can take advantage of the photothermal effects of photothermal agents to acquire the energy from laser irradiation and convert it into heat. This can intensively elevate the temperature of the surrounding environment to directly destroy the cancer cells. It is expected that PAs with strong absorption in near infrared (NIR) range might possess the ideal tissue-transparent feature and minimal damage to surrounding healthy tissues, beneficial to the practical application. Herein, well-dispersed L-cysteine modified MoS 2 (MoS 2 -Cys) nanospheres with the average diameter of about 422 nm and strong NIR adsorption were successfully synthesized through a facile method. The as-prepared MoS 2 -Cys nanospheres are composed of nanosheets with the average thickness of about 13.7 nm. The photothermal conversion efficiency of the as-prepared MoS 2 -Cys nanospheres with the very low concentration of 50 μg/mL was determined to be 35% when exposed to 808 NIR laser at the power density of 0.8 W/cm 2 , much higher than those of the previous reports with same dose and power density. MoS 2 -Cys nanospheres possessed the good photothermal ablation effect to significantly inhibit the growth of tumor in vivo . Furthermore, MoS 2 -Cys nanospheres did not exhibit detectable side effects, suggesting their good in vitro and in vivo biocompatibility.
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LANGMUIR
·
2023
·
IF 3.9
Xiaoya Meng,Maosheng Sang,Qi Guo,Zhongyu Li,Quanlong Zhou,Xia Sun,Wenping Zhao
Herein, a sensitive and selective electrochemical sensor based on aptamer folding was constructed to detect aflatoxin B1 (AFB1) in peanuts. Specifically, polyethylenimine-functionalized multiwalled carbon nanotubes modified with molybdenum disulfide (MoS2@MWCNTs–PEI) were used as the electrode matrix to enable a large specific surface area, which were characterized by the Randles–Sevcik equation. Additionally, AuNPs were used to immobilize the aptamer via the Au–S covalent bond and provide a favorable microenvironment for signal enhancement. Methylene blue (MB) was modified at the proximal 3′ termini of the aptamer as the capture probe, while the signal transduction of the sensor was obtained through changes in conformation and position of MB induced by the binding between AFB1 and the probe. Changes in spatial conformation could be recorded by electrochemical methods more readily. This electrochemical aptasensor demonstrated remarkable sensitivity to AFB1 with an extensive detection range (1 pg/mL to 100 ng/mL) and a lower limit detection (1.0 × 10–3 ng/mL). Moreover, using the constructed aptasensor, AFB1 was identified successfully in peanut samples, with recoveries ranging from 95.83 to 107.53%, illustrating its potential use in determining AFB1 in food.
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