APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Jia-Cheng E. Yang,Min-Ping Zhu,Xiaoguang Duan,Shaobin Wang,Baoling Yuan,Ming-Lai Fu
Two-dimensional layered MoS 2 recently demonstrates great potentials in water purification via adsorption and catalysis. The structure-catalysis relationship of MoS 2 has not been well addressed. Herein, we investigated the mechanistic difference of 1 T-2H MoS 2 homojunctions in catalytic activation of peroxymonosulfate (PMS) and peroxydisulfate (PDS) for degrading butyl paraben (BPB). PMS/1 T-2H MoS 2 attains higher performance in BPB removal compared to PDS/1 T-2H MoS 2 . 1 T phase in MoS 2 primarily contributed to PMS activation to produce SO 4 − , OH and 1 O 2 , while the defects in MoS 2 coordinated the PDS activation to generate OH, 1 O 2 and O 2 − . Nevertheless, OH-induced BPB removal was the top priority for PMS/1 T-2H MoS 2 and PDS/1 T-2H MoS 2 . The different activation pathways and reactive species resulted in the varying BPB removal, by-product distributions and toxicity. This work provides new insights into the different functions of MoS 2 in persulfates activation and the guidance in rational design of oxidant-oriented MoS 2 composites for sewage purification.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Yuyuan Deng,Qin Zhang,Huachuan Zhang,Chengxi Zhang,Wenhu Wang,Yi Gu
To study oxazine ring formation in benzoxazine synthesis from phenol, primary amine and formaldehyde, reactions between 2-phenylaminomethylphenol (Mannich base) and formaldehyde in homogeneous dioxane/water solution are researched. Reaction orders, rate constants at different temperatures, and activation energy are calculated, the process of reaction is proposed, and the influence of acid and base is discussed. The reaction can occur at low temperature and generate the product 3,4-dihydro-2H-3-phenyl-1,3-benzoxazine. No intermediate 2-(N-hydroxymethyl-N-phenylamino)methylphenols are observed. The concentration of a Mannich base has little effect on the reaction rate, while the reaction is first-order to formaldehyde. Based on chemical properties of formaldehyde in aqueous solution, the reaction process includes the following three steps: degradation of poly(oxymethylene) glycols to methylene glycol, dehydration of methylene glycol to formaldehyde molecule, and the reaction between a Mannich base and formaldehyde molecule to benzoxazine. Dehydration of methylene glycols to formaldehyde molecules is the rate-controlling step.
研究领域:
有机化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Shufang Ren,Wangyong Cui,Ying Liu,Shounian Cheng,Qingtao Wang,Runyan Feng,Zhixiang Zheng
1T phase molybdenum disulfide (MoS 2 ) possesses excellent electrical conductivity , 10 7 times higher than that of 2H phase MoS 2 . Thus, metallic 1T MoS 2 is highly desirable for electrochemical analysis and catalysis. In this study, hybrid 1T/2H MoS 2 /multi-walled carbon nanotubes (MoS 2 /MWCNTs) composite was prepared by a facile and simple hydrothermal approach. Powder X-ray diffraction, field emission scanning and transmission electron microscopes, Fourier transform infrared spectroscopy, Raman spectroscopy , cyclic voltammetry (CV), and electrochemical impedance spectroscopy were used to characterize the composites. The results show that metallic 1T phase MoS 2 was formed by the inductive effect of MWCNTs. The high conductivity and large specific surface area of hybrid 1T/2H MoS 2 /MWCNTs composite endow great catalysis activity in electrochemical analysis. Polypyrrole molecularly imprinted polymer (MIP) film imprinted with acetaminophen (AP) template was electrochemically deposited on glassy carbon electrode (GCE) modified by 1T/2H MoS 2 /MWCNTs (MoS 2 /CNTs/GCE) to construct MIP based sensor. The prepared MIP/MoS 2 /CNTs/GCE sensor shows a sensitive current response towards AP. Through the optimization of the ratio of monomer and template, CV electropolymerization cycles, CV elution cycles, incubation time, and pH, the accessible linear range of 0.01–300 μM was obtained with the limit of detection of 0.003 μM (S/N = 3) by differential pulse voltammetry . In addition, the prepared sensor shows great detecting robustness with excellent selectivity , anti-interference property, reproducibility, and stability. In the urine sample tests, the sensor shows desirable reliability with the recovery rate of 88.1–95.9%.
研究领域:
分析化学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5507-5516
·
IF 7.779
Xiaocheng Xu,Rui Wang,Sijie Chen,Alex Trukhanov,Yanxue Wu,Lianyi Shao,Le Huang,Zhipeng Sun
Developing non-noble metal-based electrocatalysts with excellent activity and stability for the hydrogen evolution reaction (HER) is crucial for the efficient electrolysis of water. Herein, self-supported three-dimensional (3D) P-doped NiSe/2H-MoSe2 nanorod arrays (denoted as P-NiSe/MoSe2) were fabricated by a hydrothermal reaction and subsequent selenization and phosphorization processes. Benefiting from P doping, the synergistic effect of the heterostructures, and abundant active sites, the P-NiSe/MoSe2 electrocatalyst exhibits excellent alkaline HER performance, with only 43 mV required to achieve 10 mA cm−2 with a Tafel slope of 93.1 mV dec−1, even remaining stable at 10 mA cm−2 for 30 hours. In addition, theoretical calculations show that the formation of the heterostructure and P doping optimize the H atom adsorption energies and accelerate electron transport, thus improving its performance in the HER. This work offers a hopeful route for the development of low-cost and efficient electrocatalysts through the simultaneous application of heterostructure engineering and heteroatom doping as well as a 3D structure.
研究领域:
材料科学
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电催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jinchao Chen,Zhi Chen,Wan Zhao,Yurong Liu,Jianhao Wu,Weiwei Wang,Xiangyu Chen,Jingyang Gao,Jinglei Hu,Lili Xie,Qiyan Wei,Lan Li
Molybdenum disulfide (MoS 2 ) is a member of promising transition-metal dichalcogenides (TMDs); however, its practical application is restricted due to the heavy aggregation. 1T/2H-MoS 2 decorated with SiO 2 nanospheres was successfully prepared through a facile hydrothermal process demonstrating improved behavior for the visible-light-driven treatment of aquatic antibiotic residues. The prepared samples were characterized by XRD, Raman spectra, SEM, TEM, XPS, and KPFM systematically. The improved properties are related to the increased light absorption, decreased accumulation of 1T/2H-MoS 2 , and the reduced recombination of electron-hole pair due to the introduction of SiO 2 . Moreover, the scavenger studies confirm that superoxide radicals (⋅O 2 − ), hydroxyl radicals (⋅OH), and holes (h + ) play a vital role in the photocatalytic degradation of TC-HCl, and a possible mechanism for photocatalysis is discussed. This work provides a promising strategy to modify the photocatalytic performance by simply dispersing the photocatalyst with another component such as SiO 2 .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 3
·1372-1380
·
IF 3.3
Peng Sun,Menglu Zhang,Yue Liu,Jiahua Zhao,Jiawei Yang,Yufeng Wang,Yongfei Wang,Zhiqiang Zhang
Lithium-ion batteries have been regarded as a promising power source for various electronic devices. Compared to the traditional graphite anode material, MoSe2 possesses a higher theoretical capacity. However, MoSe2 anode materials are limited by low electronic conductivity and large volume changes during cycling. This study reports 1T–2H MoSe2/N-doped rGO nanocomposites, fabricated through a hydrothermal method. The 1T–2H MoSe2/N-doped rGO electrode delivers a high reversible capacity of 483.6 mA h g−1 after 1000 cycles at 1000 mA g−1. It also possesses a high reversible capacity of 474.9 mA h g−1 even at a current density of 2000 mA g−1, thus, making it an important potential lithium-ion battery anode.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 35
·16531-16538
·
IF 3.3
Yulong Zheng,Hui Zhang,Pei Han,Zhaoshun Zhang,Xueqin Zuo,Qun Yang,Huaibao Tang,Shaowei Jin,Guang Li
Solar distillation can directly produce clean water from non-potable water resources using solar energy and has great promise in desalination systems. However, the improvement of evaporation efficiency through the selection and optimization of suitable candidate materials is still a challenging problem. In this paper, by implementing a customized insulating floating layer and establishing an interfacial evaporation system, we have achieved a successful experiment demonstrating the potential to improve the efficacy of solar steam generation. This system is created by growing 1T-2H mixed-phase molybdenum disulfide composites on the carbonized ZIF8 surface. In this study, the treated composites were well integrated with the thermal insulating floating layer to achieve a stable interfacial structure for photothermal conversion. Furthermore, the cotton threads, known for their great absorbency, created an unhindered pathway for water flow, making it easier for steam to be generated and circulated. Using the above system, under one solar illumination condition, a significant evaporation rate of 1.57 kg m−2 h−1 was attained. The solar steam conversion efficiency of this interfacial heating system under one solar illumination condition was 94.4%. In addition to demonstrating that interface engineering is effective for solar steam production, this work offers a simple and economical water purification method.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 12
·3985-3992
·
IF 8.8
Yang Yang,Liang Qing-Rong,Zhu Chun-Li,Zheng Guo-Zhong,Zhang Jian,Zheng Shou-Jun,Lin Yung-Chang,Zheng De-Zhi,Zhou Jia-Dong
Van der Waals coupling with different stacking configurations can significantly affect the optical and electronic properties of ultrathin two-dimensional (2D) materials, which is an effective way to tune device performance. Herein, we report a salt-assisted chemical vapor deposition method for the synthesis of bilayer V-doped MoS 2 with 2H and 3R phases, which are demonstrated by the second harmonic generation and scanning transmission electron microscopy. Notably, the mobility of the 3R phase V-doped MoS 2 is 6.2% higher than that of the 2H phase. Through first-principles calculations, we further reveal that this particular behavior is attributed to the stronger interlayer coupling of 3R compared to the 2H stacking configuration. This research can be further generalized to other transition metal chalcogenides and will contribute to the development of electronic devices based on 2D materials in the future.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
二维材料
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半导体材料
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表面科学
·
计算材料学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 24
·7914-7921
·
IF 6.119
Qiuzhong Li,Lin Huang,Wenxin Dai,Zizhong Zhang
The 1T/2H heterophase junction MoS2 2D nanolayer for assembly into microspheres were fabricated through a simple one-step hydrothermal synthesis. These unique junction structure MoS2 microspheres facilitate the separation of the electron–hole between different phases for forming the built-in electric field in the nanolayer. The content of 1T/2H heterophase junctions could be effectively regulated by simple changing the molar ratio of the Mo/S source in the synthesis processes. The prepared MoS2 microspheres as a photocatalyst enable the effective hydrogen production from water. The hydrogen production activity of the photocatalyst is dependent on the content of the heterophase junctions. The hydrogen production rate was the highest up to 22.4 μmol h−1 on the optimal sample MS (1 : 2).
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yingjie Cheng,Li He,Dong Mao,Xuejian Shi,Chunzhong Wang,Fengxue Duan,Pengyan Xue,Yizhan Wang,Yingjin Wei
The active electronic states in 1T-MoS 2 are highly desirable for catalyzing polysulfides conversion. However, stable 1T-MoS 2 is difficult to produce using common approaches. Herein, V uniformly doped in-plane 1T-2H heterostructured MoS 2 nanosheets (V-MoS 2 ) are prepared by a facile hydrothermal method with a polyoxometalate precursor containing periodic Mo and V atomic arrangement. The doping of V induces the phase transition from semiconducting 2H-MoS 2 to metallic 1T-MoS 2 and stabilizes the resulted 1T phase. Importantly, the incorporation of V not only modifies the surface electronic property of MoS 2 , enhancing the active site density, but also improves the adsorption of polysulfides and the catalytic efficiency for sulfur redox reactions. With these advantages, the Li-S batteries using V-MoS 2 electrocatalyst achieve accelerated reaction kinetics and superior electrochemical performance. When the S loading of the cathode is 5.41 mg cm −2 , a favorable discharge capacity of 4.98 mAh cm −2 is obtained with satisfying cycle stability. This work provides an efficient atomic engineering approach for the design of high performance electrocatalyst for Li-S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 30
·6451-6458
·
IF 5.344
Daomeng Liu,Daquan Wang,Xunan Jing,Xiaoping Zhao,Duo Xi,Dongfeng Dang,Lingjie Meng
Nanozymes are a new generation of artificial enzymes that address the limitations of natural enzymes, with numerous reports on the development of high performance nanozymes for various applications. Herein, the phase regulation of network-like MoSe2 from the metal 1T phase to semiconductor 2H phase was achieved under different reaction conditions by a facile but efficient microwave-assisted solvothermal method. The coexisting 1T/2H-MoSe2 with edge enriched and defective nanostructures showed great enhancement of the peroxidase-like properties. This high enzymatic activity may arise from optimized active sites of 1T/2H-MoSe2, effectively leading to a rapid charge transfer within the substrate. In addition, chitosan functionalization not only greatly improves the dispersion stability of MoSe2, but also significantly increases its peroxidase-like activity, probably due to its enhanced affinity to hydrogen peroxide (H2O2). Based on these results we have established a highly sensitive colorimetric assay for the detection of H2O2 and glucose in human serum.
研究领域:
材料科学
·
生物催化
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xin Wang,Tao Yang,Xinmei Hou,Yapeng Zheng,Enhui Wang,Zhengtao Du,Sheng Cao,Hailong Wang
Silicon carbide nanowires (SiC NWs) were successfully synthesized using graphene and Si powder as raw materials in NaCl–NaF at 1300–1400 °C for 6 h. The synthesized SiC NWs have two crystal phases due to the presence of molten salt, which formed the 2H/3C–SiC heterojunction structure. The possible synthesis mechanism of SiC NWs is “dissolution-diffusion-reaction”. Besides, photoluminescence (PL) spectra of 2H/3C–SiC heterojunction NWs show that the main emission peak has a significant blue shift, locating in 350–600 nm. The main reason is caused by the defects of 2H/3C–SiC heterojunction structure and the spontaneous polarization of 2H–SiC nano segments.
研究领域:
材料科学
·
光学
✓ 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）