Nanomaterials
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2022
·Vol. 12
·期 19
·3472
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IF 5.719
Hongwei Tang,Mengyue Liu,Lingna Kong,Xiaoyan Wang,Yue Lei,Xige Li,Yan Hou,Kun Chang,Zhaorong Chang
In this paper, a series of Fe3O4/MoS2/NiS composite electrodes were synthesized by a simple coprecipitation method. The influence of different ratio additives (MoS2and NiS) on the performance of iron anodes for Ni-Fe batteries was systematically investigated. In this paper, the mixed alkaline solution of 6 mol/L NaOH and 0.6 mol/L LiOH was used as electrolyte, and sintered Ni(OH)2was used as counterelectrode. The experimental results show that the MoS2and NiS additives can effectively eliminate the passivation phenomena in iron electrodes, reduce the electrode polarization, and increase the reversibility capacity. As a result, the Fe3O4/MoS2/NiS composite electrodes exhibit a high specific capacity, good rate performance, and long cycling stability. Especially, the Fe3O4/MoS2(5%)/NiS (5%) electrode with a suitable ratio of additives can provide excellent electrochemical performance, with high discharge capacities of 657.9 mAh g−1, 639.8 mAh g−1, and 442.1 mAh g−1at 600 mA g−1, 1200 mA g−1, and 2400 mA g−1, respectively. This electrode also exhibits good cycling stability.Keywords:nickel-iron battery;iron anode;Fe3O4;sulfide additives
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Qirui Wang,Pengfei Xiao
Transition metal compounds are often used as activators in advanced oxidation processes for the treatment of refractory organics. However, the problems of inter-particle agglomeration, metal ion leaching and difficulty in recycling frequently occurred, resulting in reduced activation performance and secondary pollution. In this study, biochar (BC) was prepared from agricultural waste pine cone shells, and then a self-synthesized heterogeneous CuFe 2 O 4 -MoS 2 @BC composite was prepared for the first time, which can be used as an activator of peroxymonosulfate (PMS) for the oxidative degradation of tetracycline (TC). Analysis techniques such as XRD, SEM, BET, FT-IR, Raman, XPS, and VSM indicated that the heterogeneous catalyst with good surface properties and catalytic stability has been successfully prepared. When different concentrations of TC were treated with 0.5 g/L CuFe 2 O 4 -MoS 2 @BC and 1 mmol/L PMS, the highest degradation rate could reach 99.66 % after 60 min. Under the interference of pH, common anions and humic acid in the water environment, the degradation system can still achieve high degradation efficiency, showing excellent anti-interference ability and practical applicability. The analysis of activation mechanism reveals that the three redox ion pairs Cu + /Cu 2+ , Fe 2+ /Fe 3+ and Mo 4+ /Mo 6+ simultaneously participated in the activation of PMS, realizing multi-path electron transfer . And MoS 2 played an excellent co-catalysis role in promoting the cycling of the valence states of the ions. A total of 24 intermediate products was detected in the degradation process using LC-MS technology, and the possible degradation pathways for TC degradation were proposed. The self-synthesized CuFe 2 O 4 -MoS 2 @BC composite with high catalytic performance, stability, recyclability and low ion leaching rate has broad application prospects in the treatment of tetracycline antibiotic wastewater by activated PMS.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Zihao Hu,Beiyang Guo,Huiqi Wu,Fang Zhu,Sridhar Komarneni,Jianfeng Ma
In this paper, MIL-101(Fe) and MoS 2 composites (MIL-101(Fe)/MoS 2 ) were synthesized using a facile solvothermal method . As a new degradation system, the synthesized composites were investigated using persulfate (PS) activation based on visible light (Vis). To establish the superiority of a heterogeneous photochemical catalysis system, the MIL-101(Fe)/MoS 2 was used as the catalyst in the presence of Na 2 S 2 O 8 with visible light irradiation. In the system mentioned, the MIL-101(Fe)/MoS 2 catalyst presented a much better catalytic ability than that of either a single photocatalysis or chemocatalysis system. The better catalytic ability suggests that the MIL-101(Fe)/MoS 2 catalyst was capable of effectively integrating photocatalysis and chemocatalysis leading to the highest degradation efficiency of 85% in 40 min with tetracycline as the target pollutant. The catalytic system MIL-101(Fe)/MoS 2 /PS/Vis degraded TC pollutant by forming species of O 2 ‾, 1 O 2 , hydroxyl radicals (•OH) and sulfate radicals (•SO 4 ‾) to degrade TC. Furthermore, the MIL-101(Fe)/MoS 2 catalyst displayed better catalytic performance compared to those materials that were previously reported, as verified by the good stability (reached 80% after three cycles) and the high TC degradation rate (85%) of the currently developed material. This system may be applicable to the degradation of TC and other challenging organic pollutants .
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Journal of Environmental Sciences
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2022
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IF 6.796
Jianhui Xu,Pengxu Wang,Shenggui Chen,Lei Li,Dan Li,Yunfei Zhang,Qi Wu,Jinhong Fan,Luming Ma
Here, we report the production of 3D-printed MoS 2 /Ni electrodes (3D-MoS 2 /Ni) with long-term stability and excellent performance by the selective laser melting (SLM) technique. As a cathode, the obtained 3D-MoS 2 /Ni could maintain a degradation rate above 94.0% for florfenicol (FLO) when repeatedly used 50 times in water. We also found that the removal rate of FLO by 3D-MoS 2 /Ni was about 12 times higher than that of 3D-printed pure Ni (3D-Ni), attributed to the improved accessibility of H*. In addition, the electrochemical characterization results showed that the electrochemically active surface area of the 3D-MoS 2 /Ni electrode is about 3-fold higher than that of the 3D-Ni electrode while the electrical resistance is 4 times lower. Based on tert -butanol suppression, electron paramagnetic resonance and triple quadrupole mass spectrometer experiments, a “dual path” mechanism and possible degradation pathway for the dechlorination of FLO by 3D-MoS 2 /Ni were proposed. Furthermore, we also investigated the impacts of the cathode potential and the initial pH of the solution on the degradation of FLO. Overall, this study reveals that the SLM 3D printing technique is a promising approach for the rapid fabrication of high-stability metal electrodes, which could have broad application in the control of water contaminants in the environmental field.
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EUROPEAN POLYMER JOURNAL
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2022
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IF 5.546
Pengfei Yan,Mengya Li,Jie Liu,Lingfei Song,Keyong Tang
Hydrogel is an ideal biomedical material because of its 3D network structure. However, their applications are greatly limited due to their poor mechanical strength and antibacterial property. Herein, a physically cross-linked and light-responsive poly(vinyl alcohol) (PVA) hydrogel embedded with quaternized chitosan-coated molybdenum disulfide (QCS-MoS 2 ) nanomaterials was successfully prepared. The photothermal performance of QCS-MoS 2 was studied with the results that QCS-MoS 2 could be employed as a superior photothermal agent for light responsive hydrogels. After being incorporated with QCS-MoS 2 , a hydrogen bonding network could be formed in the hydrogel matrix, significantly increasing the mechanical properties. Moreover, the hybrid hydrogels exhibited excellent antibacterial properties. 95.6 % of Staphylococcus aureus ( S. aureus ) and 98.8 % of Escherichia coli ( E. coli ) were killed in 15 min due to the synergistic effects of the high temperature and the reactive oxygen species (ROS) generated by the irradiation of 808 nm near-infrared (NIR) light. No cytotoxicity was found by the introduction of QCS-MoS 2 , suggesting a great potential in photothermal antibacterial application for biomedical materials.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qicheng Zhang,Yue Song,Bin Chen,Xuewen Hu,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Two-dimensional (2D) materials have unique planar structures and ultrathin thicknesses, but are prone to restacking and agglomerate due to the high surface energy. Building hierarchical structures is one of the effective ways to exploit their inherent properties and unique structural advantages. We unexpectedly found that the introduction of saturated NaCl solution to the hydrothermal synthesis of MoS 2 could significantly change its structure, resulting in the hierarchically structured nanosheet-assembled MoS 2 nanorods (R-MoS 2 ) with intercalated alkali ions. The formation process and synthesis mechanism of R-MoS 2 via NaNH 4 Mo 3 O 10 ·H 2 O reaction intermediate are systematically revealed by morphology and spectroscopy. Benefiting from this interesting hierarchical structure, the catalytic conversion of R-MoS 2 for p -chloronitrobenzene hydrogenation is significantly improved. Density functional theory calculation also demonstrates the intercalation of Na in MoS 2 can downshift the d -band center of Mo and favors the key final desorption process.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Wending Yang,Ziwei Hu,Chuntang Zhang,Yanyan Guo,Jiang Zhao
Flexible planar micro-supercapacitors (MSCs) are favored in wearable electronics for energy storage components due to their great advantages in miniaturization, integration, and flexibility. However, the fabrication process of MSCs is usually complicated, and simple, fast and practical techniques for the preparation of MSCs still face challenges. Herein, a simple and efficient screen printing technique is creatively employed for fabrication of high-performance flexible planar MSCs based on pseudocapacitive MoS 2 nanoparticles decorated highly conductive electrochemically exfoliated graphene (MoS 2 /EEG) hybrid electrodes. The as-assembled MoS 2 /EEG MSCs reveal a noteworthy areal capacitance of 13.6 mF cm –2 , a super high energy density of 1.478 mW h cm –2 with a high power density of 0.08 W cm –2 , and outstanding cycling stability with capacitance attenuation of only 10% of after 10,000 charge and discharge cycles. Briefly, such screen-printed planar MoS 2 /EEG MSCs have good scalability, excellent mechanical properties, and fine performance consistency, which are most promising as an important micro-power energy storage component for flexible integrated electronic devices.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xinzhi Wang,Zhenguo Chen,Yutian He,Xiaohui Yi,Chao Zhang,Qiao Zhou,Xuezhu Xiang,Yunan Gao,Mingzhi Huang
Imidacloprid (IMI) which has been widely detected in the natural water environment is potentially genotoxic to humans and should be effectively eliminated. Persulfate-based advanced oxidation processes are considered to be reliable means aiming at organic pollutants degradation, while an efficient catalyst is urgently needed for the activation of the reaction. As a two-dimensional material, 1T-MoS 2 is expected to be applied for the activation of persulfates due to its abundant active sites and good electrical conductivity. Therefore, in this study, 1T-MoS 2 was synthesized by a simple and safe two-step solvothermal reaction and proposed as an emerging activator of peroxymonosulfate (PMS) for the degradation of IMI. It was found that 1T-MoS 2 has significantly better catalytic performance on PMS than 2H-MoS 2 and Bulk-MoS 2 , reaching. 76.4 % at pH = 3. The degradation rate of IMI reduced under alkaline conditions due to the inhibition of catalytic processes. Among the different coexisting anions, H C O 3 - had the greatest degree of interference and inhibition to the degradation process, resulting in the lowest IMI degradation rate for only 42.45 %. Quenching experiments and EPR analysis showed that S O 4 - ∙ and OH were the main reactive oxygen species in the 1T-MoS 2 /PMS process. In addition, the IMI degradation pathways analyzed by UPLC-Q-TOF-MS/MS included dehydrogenation, electrophilic addition, heterocyclic ring breakage and intramolecular rearrangement. This study promotes the application of 1T-MoS 2 and is expected to provide a novel persulfate-based advanced oxidation process catalyzed by 1T-MoS 2 for IMI elimination in the aqueous environment.
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POLYMER DEGRADATION AND STABILITY
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2022
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IF 5.204
Lingxin He,Fukai Chu,Xia Zhou,Lei Song,Yuan Hu
Design novel flame retardant and mechanical enhancing agents of waterborne polyurethane (WPU) is a crucial issue for expanding its application. Herein, BP@MoS 2 hybrids was designed and prepared to enhance the fire safety and mechanical properties of WPU and BP@MoS 2 possessed a novel cactus-like structure. BP@MoS 2 was prepared in a two-step method including preparation of black phosphorus (BP) sheets by chemical vapor transfer method and preparation of BP@MoS 2 by in situ growth of molybdenum disulfide (MoS 2 ). with adding 2.0wt% BP@MoS 2 , the tensile strength and fracture strength of WPU/BP@MoS 2 -2.0 increase by 57.7% and 36.5%, respectively. The peak value of heat release rate (PHRR) and total smoke production (TSP) of WPU/BP@MoS 2 -2.0 also reduce by 50.3% and 52.0%, which indicates that fire safety and mechanical performance of WPU/BP@MoS 2 -2.0 is effectively enhanced. Meanwhile, BP@MoS 2 has both condensed phase and gas phase flame retardant effect on WPU. In condensed phase, the residue char of WPU/BP@MoS 2 is with excellent physical barrier effect. In gas phase, BP@MoS 2 can inhibit the generation of flammable volatiles such as aromatic and aliphatic compounds during burning of WPU/BP@MoS 2 , thereby inhibiting the heat release and smoke release behavior of WPU/BP@MoS 2 .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Duqiang Xin,Shaodan He,Xiaona Han,Xudong Zhang,Zhaofang Cheng,Minggang Xia
The widespread use of wearable devices has triggered a huge demand for flexible power source. Flexible lithium-ion batteries (LIBs) are widely regarded as an ideal power source for wearable devices because of their high energy density and long cycle life, but their application is limited by traditional rigid electrodes. A promising strategy is to prepare flexible electrodes by synthesising active materials with high capacity on flexible carbon substrates. In this study, Co-doped 1T‐MoS 2 nanosheets were successfully anchored on a pretreatment carbon cloth (CC) by using a facile one-step solvothermal method, which is denoted as Co-MoS 2 /CC. Benefiting from the high conductivity and large layer spacing of the metallic 1T‐MoS 2 , self-supporting CC framework, doping of cobalt and their synergistic effect, when used as a self-supporting anode for LIBs, Co-MoS 2 /CC delivers a high reversible capacity of 1392 mAh g −1 at 0.1 A g −1 and retains 611 mAh g −1 at 2 A g −1 over 300 cycles. Furthermore, it delivers a remarkable rate performance of 230 mAh g −1 at 10 A g −1 . The facile and scalable synthesis method can also be applied to other similar flexible free-standing electrodes for the application of electrochemical energy storage.
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FUEL
·
2022
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IF 8.035
Zhe Bai,Luyao Wang,Hongwei Cao,Xiangwen Zhang,Guozhu Li
Hydrodesulfurization (HDS) is an effective way to reduce sulfur content in oil for the enforcement of more stringent environmental regulations. MoS 2 has been widely used as an effective component for catalyzing HDS, and needs to be extensively studied in depth. Herein, MoS 2 nanoflowers with the symbiosis of 1T-2H phases in the basal planes and coexistence of S and Mo vacancies are prepared via the assembly of many nanosheets by a one-pot solvothermal method. The morphology, crystal phase structure and defects of these 1T-2H MoS 2 samples were well characterized. The 1T/2H ratio and the state of vacancies were effectively tuned by changing the solvothermal conditions. Active and stable 1T-2H mixed MoS 2 nanoflowers with high content of 1T phase and moderate S and Mo vacancies were obtained by the regulation of oxalic acid in the mixture of ethanol and water. In the HDS of dibenzothiophene at 300 °C and 4 MPa, the optimal catalyst of MoS 2 -water–ethanol-OA exhibited a substrate conversion of 89.3% in 10 h. Moreover, the activity of MoS 2 -water–ethanol-OA was well retained without any decrease in the recycling experiment.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Qian Zhu,Yan Zhuang,Hongqing Zhao,Peng Zhan,Cong Ren,Changsheng Su,Wenqiang Ren,Jiawen Zhang,Di Cai,Peiyong Qin
The selective oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF) is an important reaction for renewable biomass building blocks. Compared with thermal catalytic processes, photocatalytic production of DFF from HMF has attracted tremendous attention. Herein, the MoS 2 /CdIn 2 S 4 (MC) flower-like heterojunctions were prepared and considered as photocatalysts for selective oxidation of HMF into DFF under visible-light irradiation in aqueous solution. Results demonstrated MoS 2 in MC heterojunction could promote the separation of photoexcited electron-hole pairs, while the amount of MoS 2 dropping was proved influenced on the photocatalytic performance. 80.93% of DFF selectivity was realized when using 12.5% MC as photocatalyst. In addition, the MC catalyst also showed great potential in transformation of other biomass derived benzyl- and furyl-alcohols. The catalytic mechanism suggested that · O 2 - was the decisive active radical for HMF oxidation. Therefore, the MC heterojunction could be applied in photocatalytic conversion of biomass to valuable chemicals under ambient condition.
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