Journal of Cleaner Production
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2021
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IF 9.297
Banghao Du,Gongduan Fan,Shangwu Yang,Zhuoyi Chen,Jing Luo,Weiwei Yu,Junyi Yu,Qi Wei,Yushan Lu
Reactive oxygen species (ROS) play a considerable role in the catalytic reaction for removing organic pollutants, however, the generation and transformation mechanism by catalyst with light and ultrasonic irradiation still requires intensive investigation. In this study, a novel Er 3+ -CdS/MoS 2 (ECMS) composite was synthesized, and the synergetic degradation effects for 17β-estradiol (17β-E2) during the sonophotocatalytic (SPC) process were investigated. The contribution of ROSs for eliminating 17β-E2 during the SPC process through quenching experiments was generally ranked in the following order: superoxide radical (•O 2 − ) ≈ hole (h + ) > hydroxyl radical (•OH) > H 2 O 2 > singlet oxygen ( 1 O 2 ). •OH plays a crucial role in 17β-E2 removal by ECMS under sonocatalysis and photocatalysis conditions. The transformation process among ROSs was further analyzed and elucidated in the light of the probe measurement results with positive or negative correlation among ROSs. Besides, we observed a phenomenon that the generated concentration of •O 2 − rises first and then falls during the SPC process, which might be attributed to the formation of 1 O 2 via the oxidation of h + or recombination with •OH. This work clarifies the underlying mechanisms of sonophotocatalytic generation and transformation of ROSs in depth.
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APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Xingchao Zhang,Ruoyu Zhang,Siying Niu,Jiming Zheng,Chongfeng Guo
The MoS 2 /g-C 3 N 4 heterojunction composite (marked as MoS 2 /g-C 3 N 4 -H) was successfully prepared via calcining the melamine coated MoS 2 nano-sphere, where the thin g-C 3 N 4 nano-sheets were tightly grown on the surface of MoS 2 nano-sphere to form MoS 2 inlaying in g-C 3 N 4 heterostructure. The detailed charge transfer mechanism was discussed by combining theoretical calculation and experiments, in which the intrinsic cause of photo-generated charge separation and transfer was determined as the directional built-in electric field driven by different Fermi levels of MoS 2 and g-C 3 N 4 . Comparatively, the enhanced photo-catalytic performance and stability of the sample were assessed by degrading the Rhodamine (RhB) and reducing the Dichromate (Cr 6+ ) solutions under the irradiation of the simulated sunlight, which could be attributed to the widened spectral absorption range and improved electron-hole separation rate. Based on above results, the photo-catalytic mechanism involving redox reactions was also clearly proposed.
研究领域:
材料科学
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环境科学
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Processes
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2023
·Vol. 11
·期 11
·3181
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IF 3.5
Chuangchuang Yang,Qiaoling Dai,Anpeng Hu,Hui Yuan,Qinghe Yang
In this present work, a new kind of sulfurized hydrodesulfurization catalyst was synthesized via the hydrothermal treatment of MoS2, NiCO3·2Ni(OH)2·4H2O, and Al2O3precursors, followed by annealing under a H2atmosphere, which does not require a sulfurization process compared to traditional preparation methods. The influence of the annealing temperature and the type of Al2O3precursor on the interactions between MoS2and Al2O3were studied using X-ray fluorescence spectroscopy, X-ray diffraction, N2adsorption–desorption, Raman spectroscopy, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The results indicated an increase in the number of stacked layers of the MoS2catalyst, accompanied by a decrease in the degree of decoration of Ni atoms onto MoS2nanoslabs, as a result of the strengthened MoS2–Al2O3interaction. Subsequently, the efficiency of hydrodesulfurization (HDS) was evaluated using dibenzothiophene as a representative reactant, while establishing a correlation between the structure of the catalyst and its performance. The catalysts, using pseudo-boehmite as the precursor and calcined at 500 °C, synthesized by calcining pseudo-boehmite as the precursor for Al2O3at a temperature of 500 °C and possessing suitable metal–support interactions, exhibited a reduced number of MoS2stacking layers and lateral dimensions, along with an optimal decoration degree of Ni atoms, thereby resulting in the highest level of HDS activity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Xianbo Yu,Feng Yan,Yang Zhao,Bo Geng,Xinzhi Ma,Lili Wu,Xitian Zhang,Yujin Chen
The inferior hydrogen evolution reaction (HER) catalytic performance of MoS 2 can be attributed to its small edge ratio, large inert substrate surface, and poor electrical conductivity, while the multiple strategies are expected to be employed simultaneously to modulate the electronic structure of MoS 2 and yield catalysts with superior HER catalytic performance. Here, we report a MoS 2 containing a 1 T phase with expanded layer spacing and construct it as a heterostructured material with MoO 2 (MoO 2 @E-MoS 2 ). Specifically, the presence of the 1 T phase and expanded layer structure of MoS 2 can enhance electrode conductivity, increase active site exposure, promote H 2 O adsorption, and optimize the Gibbs-free energy of hydrogen. The constructed heterostructure can modulate the electronic structure of the catalyst, enhance electron transfer at the interface, elevate water adsorption energy, and reduce the hydrogen reaction energy barrier. Moreover, density functional theory calculations indicate that the S site of MoS 2 in this catalyst exhibits a higher affinity for H 2 O adsorption, while the Mo site demonstrates a greater capacity for H* adsorption/desorption. Ultimately, MoO 2 @E-MoS 2 shows low overpotentials of 93 and 99 mV at a current density of 10 mA cm −2 , as well as exceptional long-term stabilities exceeding 70 and 130 h at current densities ranging from 10 to 30 mA cm −2 in acidic and alkaline media, respectively.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Ling Cai,Jing Yang,Xuemei Shao,Xinyi Zhu,Yuhui Liu,Chuanxing Wan,Fengming Wang,Qin liu,Jin Chen
Due to the overuse of antibiotics, the accelerated spread of antibiotic-resistant bacteria in the environment and healthcare facilities have urged the finding of safe and effective antimicrobial agents. Moreover, the improper discharge of antibiotics may impose a huge environmental burden due to the stable structure of antibiotics resistant to degradation. In this study, the copper-doped two-dimensional (2D) nanomaterials of molybdenum sulfide (Cu@MoS 2 ) with distinct nanoscale morphologies were facilely synthesized via an electrochemical method. In addition to the contributing role of rough morphology of materials, copper doping significantly improved the catalytic properties in antibiotic degradation and the antibacterial activities of MoS 2 materials. Density functional theory (DFT) calculation revealed that Cu could be successfully doped on MoS 2 , and the Cu adsorption configuration atop a Mo atom was the most stable. Finally, transcriptomic analysis revealed the antibacterial mechanism of the materials involved signal transduction, material transport and biological metabolism. Therefore, the constructed Cu@MoS 2 nanomaterials with defined nanoscale morphology provide an easy and economical strategy for the elimination of environmental hazards with enormous application potentials.
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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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Small
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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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PubMed
高影响因子
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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PubMed
高影响因子
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
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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ChemCatChem
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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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高影响因子
MATERIALS & DESIGN
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2021
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IF 7.991
Tayiba Ilyas,Fazal Raziq,Sharafat Ali,Amir Zada,Nasir Ilyas,Rahim Shaha,Yong Wang,Liang Qiao
Water splitting and CO 2 conversion are emerging energy transfer techniques to generate hydrogen and low carbon fuel as eco-friendly energy sources. Herein, a frugal and facile approach is reported for decorating MoS 2 nanosheets on copper nanorods to design MoS 2 /Cu architecture as a trifunctional catalyst for electrochemical water splitting and photocatalytic CO 2 conversion. Under optimized conditions, MoS 2 /Cu electrocatalyst shows high performance at an overpotential of 252 mV for oxygen evolution reaction and 160 mV for hydrogen evolution reaction to attain 20 mAcm −2 and 10 mAcm −2 current densities in alkaline medium. The improved efficiency is mainly credited to the synergistic effect of MoS 2 nanosheets and Cu nanorods architecture. The electrode delivered a cell voltage of ~1.508 V to impart about 10 mAcm −2 current density with high durability. Also, the negligible overpotential decay after running the cell for 12 h with 3000/HER and 2000/OER CV cycles suggests remarkable stability that makes it a promising electrocatalyst for energy production. The photocatalytic CO 2 conversion activity was also measured, where MoS 2 /Cu exhibited a significant efficiency of CO 2 to methane conversion (CH 4 ~ 23 µmol g −1 h −1 ). Based on the obtained results, it is foreseeable that this work validates the significance of transition metals tuning for electrocatalysts and photocatalysts toward more efficient water electrolysis and CO 2 reduction for potential large-scale energy applications.
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危险品化学品经营许可证（带存储）