NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8203-8214
·
IF 3.925
Lingli Zhang,Han Tao,Chun Ji,Qiaoling Wu,Xiao Wang,Yuangeng Wu
As an alternative to bisphenol A (BPA), bisphenol S (BPS) is widely used in many consumer goods and industrial products. However, BPS has similar genotoxic, reproductive and endocrine disrupting effects to BPA and can enter the body through the food chain or by dermal absorption to endanger human health. This paper presents a rapid and direct electrochemical sensing technique for ultra-trace BPS determination on the basis of the signal amplification of the 1T phase & 2H phase hybrid MoS2 nanosheets (1T&2H-MoS2) and amino-functionalized carbon nanotube (CNTs-NH2) composites. The cooperative electrocatalytic effect and high-electrically active surface area of 1T&2H-MoS2/CNTs-NH2 composites not only facilitated the electron transfer between BPS and the electrode, but also promoted the adsorption of BPS on the electrode. Hence, the 1T&2H-MoS2/CNTs-NH2 modified electrode exhibited excellent electrocatalytic activity with a lower oxidation potential and higher peak current for BPS. Under the optimized conditions, the peak current response of BPS showed a good dose-dependent relationship with its concentration in the range of 0.02–1.0 μM and 1.0–70.0 μM, while the detection limit was as low as 8.6 nM. The proposed method was used to determine BPS in the mineral water bottle and orange juice samples with satisfactory spiked recoveries between 92.31% and 104.20%, demonstrating its reliability and practicality in real sample analysis. Furthermore, the sensing method has the characteristics of facile electrode fabrication, fast response (<4 min) and good reproducibility.
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 14
·10302-10312
·
IF 2.993
Fan Hongmei,Wu Rong,Liu Haiyang,Yang Xi,Sun Yanfei,Chen Chu
Hybrid-phase-MoS 2 (1T@2H-MoS 2 ) nanosheet-coated black TiO 2 spheres (1T@2H-MoS 2 /B-TiO 2 ) were prepared using a hydrothermal method and a chemical reduction method under an argon atmosphere. X-ray diffraction, transmission electron microscope, Raman spectra and X-ray photoelectron spectroscopy indicated the generation of the 1T@2H-MoS 2 and black TiO 2 . The efficiency of the 1T@2H-MoS 2 /B-TiO 2 core–shell structure degradation of rhodamine B (RhB) reached 98.0%. The high photocatalytic activity was due to the presence of 1T-MoS 2 , which accelerated the electron transfer to participate in the redox reaction. In addition, the presence of B-TiO 2 suppressed the undesirable electron–hole recombination. Finally, the synergistic effect between 1T@2H-MoS 2 and B-TiO 2 promoted the separation of the photoelectron–hole pairs. Moreover, scavenger studies found that the hydroxyl radical ( • OH) was the dominant reactive oxygen species in the degradation of RhB under visible light irradiation. The possible growth mechanism and photocatalytic mechanism are discussed in detail. The results of this study will contribute to the improvement in the visible light absorption and photocatalytic degradation of catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2897-2910
·
IF 6.4
Mei Wu,Hongchang Wang,Xiaohui Liang,Dunhui Wang
In this work, we designed the flower-like structure of 1T/2H-MoS2@α-Fe2O3 nanocomposites with high-efficiency microwave absorption, in which the α-Fe2O3 microdrums are attached to the surface of 1T/2H-MoS2 constituting a special flower-like morphology. During the synthesis process, the content of α-Fe2O3 microdrums plays a significant, constructive role in the dielectric properties and impedance matching characteristics of the 1T/2H-MoS2@α-Fe2O3 nanocomposites. The optimal reflection loss (RL) value of the flower-like nanocomposites can reach −61.18 dB at low frequency (6.52 GHz), while the RL value is also −56.98 dB at 4.43 GHz with a lower frequency. Furthermore, the frequency bandwidth below −10 dB was up to 4.68 GHz with an effective absorption frequency range of 13.32–18 GHz when the thickness was 1.82 mm. The results show that excellent electromagnetic wave absorption capabilities of the 1T/2H-MoS2@α-Fe2O3 nanocomposites in the low frequency range mainly benefit from the perfect coordination of multiphase MoS2 and α-Fe2O3 microdrums, which makes them achieve perfect impedance matching in the low frequency range. This provides a simple demonstration for the development of highly efficient electromagnetic wave absorption materials in the low frequency range.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Chenhao Sun,Fangqin Li,Jianxing Ren,Jiang Wu,Guanjun Wang,Linfeng Chen
Exploring low-cost and earth-abundant photocatalysts to efficiently release H 2 from wastewater is an appealing solution for global energy and environmental issues. Here, we successfully prepared flower-like 1T/2H-MoS 2 -decorated g-C 3 N 4 (thiourea)/g-C 3 N 4 (urea) (denoted as CNT/CNU) isotype heterojunction photocatalysts via a facile ultrasonic dispersion method and researched the photocatalytic H 2 generation and pollutant degradation performance in oxalic acid (OA) simulated wastewater. The results displayed that 20% 1T/2H-MoS 2 @CNT/CNU sample exhibited the highest photoreactivity, and the H 2 release rate was 1563.32 μmolg -1 h −1 , which was about 96 times higher than the CNT/CNU. Meanwhile, it also showed the highest total organic carbon (TOC) removal rate of 67.5%. The increased photoreactivity of nanocomposites can be ascribed to the double-interface system to effectually improve the separation of photoinduced charges. Additionally, the experimental results further confirmed that the loading of flower-like 1T/2H-MoS 2 could provide abundant active sites as well as expand the visible-light absorption range. Significantly, photoelectrochemistry measurements and density functional theory (DFT) calculations also confirmed that 1T/2H-MoS 2 cocatalysts accelerated the charge migration. On this basis, the mechanism of 1T/2H-MoS 2 @CNT/CNU promoting hydrogen production and synergistic OA degradation was proposed. This research presents a prospective idea for the utilization of waste water and the simultaneous production of clean energy.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Miaogen Chen,Wenya Chang,Jing Zhang,Wan Zhao,Zhi Chen
Water pollution caused by antibiotics is a growing problem. Semiconductor photocatalysis is an environmentally friendly technology that can effectively degrade organic pollutants in water. Therefore, the development of efficient photocatalysts is of great significance to solve the environmental pollution problem. In this paper, mixed-phase TiO2 and 1T/2H-MoS2 composite (1T/2H-MoS2/TiO2) were synthesized by the in situ growth method. The prepared compounds were characterized and applied to the visible-light degradation of tetracycline hydrochloride. The photocatalytic effect of 1T/2H-MoS2/TiO2 on tetracycline hydrochloride is significantly enhanced under visible light and has good stability. It has potential applications in the treatment of organic pollutants in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 6
·1124
·
IF 4.324
Wan Zhao,Xin Liu,Xiuru Yang,Chunxi Liu,Xiaoxiao Qian,Tao Sun,Wenya Chang,Jingjing Zhang,Zhi Chen
Metallic 1T-phase MoS2is a newly emerging and attractive catalyst since it has more available active sites and high carrier mobility in comparison with its widely used counterpart of semiconducting 2H-MoS2. Herein, 1T/2H-MoS2(N) (N: MoO3nanowires were used to prepare 1T/2H-MoS2) was synthesized by using molybdenum trioxide (MoO3) nanowires as the starting material and applied in the photodegradation of antibiotic residue in water. Enhanced photocatalytic performance was observed on the obtained 1T/2H-MoS2(N), which was 2.8 and 1.3 times higher than those on 1T/2H-MoS2(P) (P: commercial MoO3powder was used to prepare 1T/2H-MoS2) and 2H-MoS2, respectively. The active component responsible for the photodegradation was detected and a reaction mechanism is proposed.Keywords:1T/2H-MoS2composite;molybdenum trioxide nanowires;photodegradation of antibiotic residue;hydrothermal method
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Mei Wu,Xiaohui Liang,Yu Zheng,Congyi Qian,Dunhui Wang
The core@shell structures and compositions hold greatly potential for microwave absorption. Herein, the Fe 3 O 4 @1T/2H-MoS 2 nanocomposites with core@shell structures were successfully fabricated through a simple hydrothermal process. The impedance matching was significantly promoted by introducing magnetic Fe 3 O 4 nanoparticles and designing the flower-like 1 T/2 H-MoS 2 with core@shell structures. It can be seen that the regulation of Fe 3 O 4 contents play an important role in electromagnetic parameters and microwave absorption performances of the Fe 3 O 4 @1T/2H-MoS 2 nanocomposites with core@shell structures. The Fe 3 O 4 @1T/2H-MoS 2 nanocomposites with core@shell structures with corresponding thickness of 2.67 mm display the minimum reflection loss (RL min ) value of − 56.22 dB at 10.36 GHz (in X band), and the maximum absorption bandwidth (AB max ) extend up to 4.76 GHz with thickness of only 1.89 mm. This result is of great significance for improving microwave absorbing performance, and the nanocomposites can be regarded as candidates for high-quality absorbing materials.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaorong Gan,Leilei Ye,Huimin Zhao,Dangyuan Lei,Yanhui Ao,Dan Zhao,Peifang Wang
Microenvironments in heterogeneous catalysis have been recognized as equally important as the types and amounts of active sites for regulating catalytic activity. Two-dimensional (2D) nanospaces between van der Waals (vdW) gaps of layered materials provide an ideal microenvironment to create novel functionalities. Here, we explore a facile method for fabricating g-C3N4/2H-MoS2 superlattice-like heterostructures based on thermochemical intercalation and polymerization reactions of formamide within enlarged vdW gaps of 2H-MoS2 nanosheets without any transfer process. DFT calculations demonstrate that the interlayer electron–electron correlations due to the intercalation effect of g-C3N4, rather than high-κ dielectric environments, lead to the improvement of intrinsic conductivity of 2H-MoS2 nanosheets. As the proof of concept in applications for the electrocatalysis field, the heterostructure for hydrogen electrochemical reaction (HER) exhibits high stability and catalytic activity in both acid and alkaline media, such as a quite low onset overpotential of 98 mV, a high exchange current density of 77.6 μA cm–2, and a small Tafel slope (52.9 mV dec–1) in an acid medium. The enhanced HER activity is attributed to the improved conductivity and nanoconfinement effect of 2D nanospaces that decrease the reaction activation energy and activate the inert basal planes.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 43
·11651-11658
·
IF 5.976
Yishuo Hu,Xiangbin Zeng,Tingting Ren,Shaoxiong Wu,Wenzhao Wang,Yang Zeng,Guangtong Zhou,Zhenyu Guo,Wen Jin,Shibo Wang,Yonghong Xiao,Jingjing Lu
Ultrathin 1T@2H-MoS2 films have excellent electronic and optical properties, and are potentially applicable in optics, electronics, energy storage, and sensing technology. However, identification of an efficient method to produce 1T@2H-MoS2 films with controllable thickness is challenging. This study describes the rapid synthesis (5–10 min) of 1T@2H-MoS2 thin films on Si/SiO2 substrates by a novel pulsed laser irradiation method. We verify the photodecomposition reaction model by measuring the UV-Vis absorption spectra of the reactants. The thickness of the synthesized MoS2 film can be controlled by adjusting the concentration of the precursor. Structural characterization confirms that both the 1T and 2H phases exist in the MoS2 film. The 1T phase enhances the conductive behavior of the MoS2 film and induces magnetism. Furthermore, pure 1T-MoS2 can be separated selectively from the MoS2 film under specific operating conditions using pulsed laser-induced synthesis. This approach is suitable for the synthesis of films of MoS2 and other 2D materials, including 1T phase-pure films.
研究领域:
材料科学
·
光学
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 40
·15322-15329
·
IF 4.569
Xinze Du,Chaofeng Zhang,Shenglin Liu
The selective activation of C–O ether bonds is an essential tool in organic synthesis and natural polymer depolymerization. However, the direct cleavage of the ether bond is still challenging work, especially breaking this inert and redox-neutral bond to provide one active carbon radical and another oxygen-centered fragment with oxidation capacity that can participate in the controllable radical reaction. We herein report that commercial 2H-MoS2 with negligible acidity can efficiently catalyze the benzylation of arenes with benzyl ethers, and a new Radical-Friedel–Crafts mechanism is proposed, which is quite different from the strong acid-catalyzed Friedel–Crafts mechanism. With dibenzyl ether as the model benzylation reagent, 2H-MoS2 can achieve the homolytic cleavage of the Bn–OR bond to generate the benzyl carbon radical and RO˙ species, identified by EPR measurement and radical trap experiments. The following radical-involved benzylation is confirmed by the Hammett results and a plausible pathway is proposed to clarify the Radical-Friedel–Crafts process. Heterogeneous 2H-MoS2 can be consecutively used four times without regeneration and it offers 94–95% yields of 2-benzyl-1,4-dimethylbenzene from dibenzyl ether and p-xylene in 30 min at 140 °C. Furthermore, this mechanism can provide some inspiration to activate the ether bond and to utilize ether as an oxidant in C–H bond activation.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 28
·12201-12207
·
IF 3.288
Yan Qiao,Xionglin Zhou,Hongchao Geng,Leilei Sun,Deshuai Zhen,Qingyun Cai
A β-NaYF4:Yb,Er,Gd nanorods@1T/2H-MoS2 nanocomposite was fabricated and used for photocatalytic sterilization under illumination from single near-infrared (NIR) light. Approximately 99.3% of Escherichia coli were killed effectively by 15 min irradiation of NIR light at a dose of 40 μg mL−1. The effective bactericidal activity is ascribed to the high upconversion luminescence efficiency of β-NaYF4:Yb,Er,Gd and the layered two-dimensional nanosheet structure of 1T/2H-MoS2. Under 980 nm light irradiation, β-NaYF4:Yb,Er,Gd emits visible light, which is absorbed by MoS2, producing strongly oxidative holes and reductive electrons. Photogenerated electron–hole pairs were able to react with H2O, O2 and OH− to produce reactive species in aqueous solution. These reactive species are strong nonselective oxidizing agents for sterilization.
研究领域:
材料科学
·
纳米技术
·
光催化
·
细菌学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）